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Bypass an inoperative channel

Subclass of:

370 - Multiplex communications

370216000 - FAULT RECOVERY

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Class / Patent application numberDescriptionNumber of patent applications / Date published
370228000 Spare channel 164
370226000 In a repeater system 16
Entries
DocumentTitleDate
20130028077TRANSMISSION APPARATUS AND METHOD - A transmission apparatus includes an acquisition device that acquires a switch request for plural types of transmission sections overlapping with one another at least at apart of the sections, a selection device that selects one of the switch requests for plural types of transmission sections according to priority level information about a priority level corresponding to each of the plural types of transmission sections, and a switch device that switches the transmission paths depending on the selected switch request.01-31-2013
20110182173Method and Device for Providing Services for User - A method and a device for providing services for a user are provided. The method includes receiving, by an interrogating call session control function (I-CSCF), a failure response returned by a first serving call session control function (S-CSCF) after the I-CSCF selects the first S-CSCF for the user according to a capability set of an S-CSCF returned by a home subscriber server (HSS) and forwards a service request to the first S-CSCF; obtaining, by the I-CSCF, information of a second S-CSCF, and forwarding the service request from the user to the second S-CSCF.07-28-2011
20110205886INFORMATION PROCESSOR AND CONTROL NETWORK SYSTEM - An information processor capable of ensuring time synchronization accuracy, ensuring EtherCAT command consistency, and easily developing the software based on a 2-port configuration even when a communication path error occurs includes: an arithmetic section; at least two communication sections each including a transmission section and a reception section; and a redundant communication control section that controls a communication path between the arithmetic section and the communication section. The redundant communication control section includes: a communication path state determination section that determines a network path state; and a redundant path switching section that switches connection between the arithmetic section and at least two communication sections. The network provides a logical ring topology for a packet communication path. The redundant path switching section functions based on the communication path state determined by the communication path state determination section and changes a connection path between the communication sections and a communication path between the communication section and the arithmetic section.08-25-2011
20090196172METHOD AND APPARATUS FOR ETHERNET RING PROTECTION - An Ethernet Ring Protection (ERP) method and the corresponding apparatus and communication equipment are disclosed. The method includes: when a link on an Ethernet ring network is faulty, judging whether the faulty link is a link where the normally blocked port is located; sending a control message which carries first indication information if the faulty link is the link where the normally blocked port is located; the ring node avoids clearing of a forwarding table after receiving the control message which carries the first indication information; sending the control message which carries second indication information if the faulty link is not the link where the normally blocked port is located; and the ring node clears the forwarding table after receiving the control message which carries the second indication information. Through the method and apparatus according to the present disclosure, the broadcast traffic generated by unnecessary clearing of the forwarding table and self-learning is reduced effectively.08-06-2009
20090135717NETWORK PROTECTION USING NETWORK CODING - A method for protecting against link failures in a communications network having a plurality of paths between senders and receivers is provided. The method includes sending data units by the senders over the communications network on working circuits, applying network coding to form a combination of data units from data units from a plurality of the senders, and sending the combination of data units over the communications network on a backup circuit. If one or more link failures occur in the working circuits resulting in loss of one or more of the data units, then the method further includes recovering the one or more of the data units from the combination of data units transmitted on the backup circuit. The backup circuit used to carry the combination of data units may be implemented in-band with user data or may be implemented as out-of-band backup circuits.05-28-2009
20090122696Data Transfer in a Messaging System - There is disclosed a source messaging system having a queue for receiving messages. The source messaging system has means for determining whether a message should be permitted to become INDOUBT. This is done by retrieving a value denoting the maximum number of messages that may be permitted to become INDOUBT at any one time; determining whether the message falls within the range denoted by the value; and responsive to determining that the message falls within the range, permitting the message to become INDOUBT.05-14-2009
20100074103SIMPLE AND RESOURCE-EFFICIENT RESILIENT NETWORK SYSTEMS - The invention is related to a method for resilient multi-path connections between edge devices of a communication network. First are determined connection-specific traffic distribution functions for the multi-paths depending on a plausible failure pattern of active and inactive paths of the multi-path of this connection. Further is selected the traffic distribution function for a multi-path depending on the current failure pattern of active an inactive paths of the multi-path of this connection and is distributed the traffic of the connection onto the path of the corresponding multi-path pursuant to the selected traffic distribution function. An essential advantage of the invention is a significant decrease of network capacity for resilient multi-path connections. Another advantage of the invention is the short reaction time in case of an outage of one or more paths of the multi-path connections.03-25-2010
20100074102TRANSMISSION DEVICE AND TRANSMISSION METHOD - A transmission device includes an ingress edge device that receives a frame, an egress edge device having a plurality of destination addresses, and a rewrite unit that rewrites a destination MAC address of the frame to another destination MAC address of the egress edge device when detecting a failure on a working path between the ingress edge device and the egress edge device.03-25-2010
20130077480MANAGEMENT OF NETWORK CAPACITY TO MITIGATE DEGRADATION OF NETWORK SERVICES DURING MAINTENANCE - A method, system and machine-readable storage device to manage network capacity are provided. In accordance with the method, simulation data is received periodically according to a metric based on data associated with a plurality of communication links interconnecting endpoints. Specially, the simulation data is received according to a periodicity adjusted selectively based on an interval of time between a current date and time and a date and time that a communication link is to be taken offline. The simulation data indicates impact of the communication link to be taken offline on a plurality of alternate communication links. Thereafter, load is moved selectively from the communication link to be taken offline to an alternate communication link of the plurality of alternate communication links based on whether the simulation data associated with the alternate communication link satisfies a predetermined criterion.03-28-2013
20130077477ADAPTIVE HYBRID WIRELESS AND WIRED PROCESS CONTROL SYSTEM AND METHOD - A hybrid wired and wireless architecture for a process control system is disclosed that includes hierarchical adaptability and optimization capabilities. The system is arranged in three tiers, the first including a number of wireless end devices exchanging packets of data and/or instructions with the distributed control system, where each wireless end device is associated with one or more meters, remote terminal units, diagnostic devices, pumps, valves, sensors, or tank level measuring devices. The second tier includes a plurality of wireless routers, each including a memory that stores a routing table and a processor that routes packets. The third tier includes a master wireless gateway device operably connected to receive packets from and transmit packets to the distributed control system. The processor of each of the wireless routers routes packets across the tiers between the end devices and the wireless gateway devices based on the stored routing table.03-28-2013
20130077479METHOD AND APPARATUS OF PERFORMING PROTECTION SWITCHING ON NETWORKS - A protection switching unit and a method of performing protection switching of the protection switching unit are provided. The method includes steps of detecting a fault that has occurred at a working path of a network; opening a first switch that is connected to the working path and closing a second switch that is connected to the protection path of the network; and maintaining a connection state of the first switch and the working path and a connection state of the second switch and the protection path, when a fault that has occurred at the working path is restored.03-28-2013
20130077478COMMUNICATION DEVICE AND PATH ESTABLISHING METHOD - A communication device configured to establish a path for data transmission including a setting circuit configured to receive a request for setting a path, and in the case that the path includes a section where power supply has been turned off so as to suppress data transmission, to set a detour path for bypassing the section using detour routing information corresponding to the section; and a power supply driving circuit configured to turn on power supply as to the section; wherein the setting circuit switches, in the case that data transmission using the section is enabled according to turning on of the power supply, the detour path to a path including the section.03-28-2013
20130077476Incremental Deployment of MRT Based IPFRR - A method supports incremental deployment of maximally redundant trees-fast reroute (MRT-FRR) by supporting MRT-FRR within an island of nodes in the network. A destination node and next hop failure selected to calculate detour paths. The clean set of nodes is calculated. The clean set of nodes is expanded with extended island candidate nodes that are reachable by a border node within the island via shortest path first (SPF) to the destination node that does not pass through the failed next hop. The extended island candidate nodes that are reachable by the border node within the island via SPF are part of an extended island. An MRT is calculated for each extended island candidate node. A candidate node is selected from the clean set of nodes according to a configured optimization option to serve as the endpoint of detour path to a destination node.03-28-2013
20130077475Optimizing Endpoint Selection of MRT-FRR Detour Paths - A method is described to be implemented by a node in a network. The method is for selecting an endpoint for a maximally redundant tree-fast reroute (MRT-FRR) detour path to optimize detour path cost or length across the network. The method defines a set of steps including selecting a destination node and next hop failure to calculate detour paths. A clean set of nodes for the network is then calculated, where the clean set of nodes are nodes in the network that are not impacted in reaching the destination node by the failure in the given next hop. A candidate node for the endpoint of the detour p path is selected from the set of clean nodes based on any one of a plurality of configured options and forwarding of data packets is configured to the selected candidate as the endpoint of the detour path to the destination node.03-28-2013
20130039169METHOD FOR ROUTING DATA PACKETS IN A FAT TREE NETWORK - In a method (02-14-2013
20090274044METHODS AND APPARATUS FOR DECENTRALIZED RAPID RECOVERY FOR ETHERNET RINGS - A telecommunications system including a plurality of switches defining an Ethernet ring; a plurality of virtual local area networks defined on the Ethernet ring, defining a number of virtual local area networks (VLANs) equal in number to the number of links; and a ring recovery system configured to recover from a link failure by rerouting traffic to a destination on the Ethernet ring via a VLAN not including a failed link11-05-2009
20100039934IN-LAYER ETHERNET P-CYCLE PROTECTION SCHEME - A method of implementing a p-cycle protection scheme for a communications network comprising a plurality of nodes and interconnecting communications links along which Ethernet traffic is forwarded in a connection-oriented manner. The method comprises for each said Ethernet node in the communications network determining a label associated with each connection-oriented Ethernet path along one or more links in said communications network for which an entry exists in a forwarding table of Ethernet switching apparatus located at said Ethernet node and mapping a plurality of said paths individually identified by said respective labels, to another path defining a p-cycle between logically adjacent nodes in said communications network, wherein each said p-cycle is provisioned in the same layer as said Ethernet traffic.02-18-2010
20130083651SYSTEMS AND METHODS TO REROUTE INTERNET PROTOCOL TRAFFIC BASED ON NETWORK USER PREFERENCES - Example methods disclosed herein to reroute Internet Protocol traffic include, after detecting a defect in a first communication path for routing user traffic associated with a network user, causing a router to buffer the user traffic for a first time period having a first duration before causing the router to reroute the user traffic over a second communication path, the first duration based on a first threshold. Such example methods also include, after detecting correction of the defect, causing the router to continue to route the user traffic over the second communication path for a second time period having a second duration before causing the router to revert to routing the user traffic over the first communication path, the second duration based on a second threshold, the first and second thresholds being adjustable based on a number of cycles of network defects and network corrections counted within a tracking period.04-04-2013
20130070585ROUTE CONTROL SYSTEM AND ROUTE CONTROL METHOD IN A SWITCHING APPARATUS - A system includes a cell handler, a virtual path handler, a virtual channel handler, a trunk. and a controller. The controller initiates, based on issuing an instruction to the cell handler, a loop-back control test. The loop-back control test involving transmission of an operation and maintenance (OAM) cell from the cell handler, via the virtual path handler, the virtual channel handler, and the trunk, and back to the cell handler. The controller further monitors the OAM cell, detects a fault based on monitoring the OAM cell; and perform fault avoidance based on detecting the fault.03-21-2013
20130051222IMPLEMENTING REDUNDANCY ON INFINIBAND (IB) NETWORKS - Methods, systems, and physical computer-readable storage medium are provided to improve efficiency of systems operating on internet protocol (IP) over Infiniband (IB) networks. In an embodiment, by way of example only, a method is provided for implementing redundancy for IB networks. The method includes detecting a failure at a first source port of a source node having a plurality of source ports, selecting a new source port, sending an address resolution protocol (ARP) message to one or more other nodes in communication with the source node including an IP address of the source node and IB address of the new source port of the source node, and re-balancing host traffic.02-28-2013
20090323520Bidirectional Forwarding Detection on Multilink Bundled Interfaces - Disclosed are, inter alia, methods, apparatus, computer-storage media, mechanisms, and means associated with Bidirectional Forwarding Detection (BFD) on multilink bundled interfaces. A packet switching device communicates with another packet switching device through a multilink bundled interface configured for communicating over a plurality of bundled communication links. A separate BFD session is conducted over each link of the multiple bundled communication links, and in response to a BFD-detected failure condition, the use of the one or more links or the entire bundled interface is removed from service.12-31-2009
20090097400Method of Restoring a Ring System - In a system comprising nodes linked in a ring structure where data flows between the nodes, a method of operating the system after a link has become broken, comprising recovering the broken link and the system treating the recovered link as still broken and operating the system so as to block the recovered link. One of the nodes in the ring system is a redundancy manager node which sends messages to the other nodes to implement blocking of the recovered link. Only when another link becomes broken does the system start to use the previously recovered link.04-16-2009
20100271937NETWORK-BASED DEDICATED BACKUP SERVICE - A system and method for providing alternate dedicated connections are described. A primary dedicated connection may be configured to connect a first network and a second network, and a second dedicated network-based connection, which may include a point-to-point protocol (PPP)/layer 2 tunneling protocol (L2TP) tunnel, may be configured to automatically connect the first network and the second network when the primary dedicated connection fails.10-28-2010
20120218883MULTICAST FAST RE-ROUTE - A method including receiving a multicast packet to route to a next multicast hop; determining that the next multicast hop is not available; performing unicast encapsulation to the multicast packet to generate a unicast-encapsulated multicast packet; and sending the unicast-encapsulated multicast packet, as a unicast transmission, via an alternate path relative to a multicast path, to the next multicast hop, wherein the alternate path is a unicast path to the next multicast hop.08-30-2012
20110038257METHOD AND APPARATUS FOR SEQUENCING OPERATIONS FOR AN INCOMING INTERFACE CHECK IN DATA CENTER ETHERNET - In one embodiment, a method includes obtaining an indication that a state associated with a node is to be changed and preventing data from being received on a first link. The method also includes updating at least one selected from a group including an incoming interface check (IIC) table and an outgoing interface (OIF) table to reflect the state. The state indicates that a second link is to be activated. Finally, the method includes allowing the data to be received on the second link after updating either or both the IIC table and the OIF table and after the timer duration for the NULL value for IIC has expired.02-17-2011
20120307628COMMUNICATION APPARATUS AND PACKET DISTRIBUTION METHOD - A communication apparatus includes a high-priority link configured to transmit one or more high-priority packets that have a priority level greater than or equal to a given level; a plurality of low-priority links that are optically coupled to the same transmission destination as the high-priority link and are configured to transmit one or more low-priority packets that have a priority level less than the given level; a first distribution circuit configured to select the one or more high-priority packets from among input packets and distribute the selected one or more high-priority packets to the high-priority link; and a second distribution circuit configured to individually distribute one or more remaining input packets, which are the input packets that have not been distributed to the high-priority link by the first distribution circuit, to the plurality of low-priority links based on distribution information about distributing packets to the plurality of low-priority links.12-06-2012
20110013510SYSTEM AND METHOD FOR PROVIDING A STABLE AND TAMPER PROOF COMMUNICATION BETWEEN A VEHICLE, A VEHICLE RELATED UNIT, AND A REMOTE SYSTEM - Systems and methods for providing a stable communication between a vehicle's on-board connectivity layer include at least one vehicle located communication node and at least one vehicle associatable communication node, and an off-board connectivity layer including at least one remote system located communication node, wherein each communication node communicates with at least one other communication node over a communication connection, and in case the communication connection to the at least one communication node is disturbed or interrupted, a communication connection to another communication node is established.01-20-2011
20110013509NETWORK NODE AND METHOD FOR ESTABLISHING NETWORK PATH AND SENDING DATA - The disclosure relates to the mesh network technology, and in particular, to a network node and a method for establishing a path and transmitting data. A method for establishing a network path is provided in an embodiment of the present invention. The method includes: receiving a gateway notification forwarded by a node with a trunk path and setting up a routing request timer; sending a routing request that contains information about whether a path is the trunk path after the routing request timer times out; receiving a route reply that is generated by the gateway after receiving the routing request from the gateway through the trunk path. In addition, a network node for implementing the method is provided in an embodiment of the present invention.01-20-2011
20090296570AUTOMATIC SEMI-CROSS CABLE AND SCRAMBLER RESOLUTION MECHANISM FOR 1000BASE-T MASTER/SLAVE DEVICE - A novel mechanism for 1000BASE-T network adapters to detect and resolve connections for cables that are either fully aligned, fully crossed or semi-crossed. The mechanism is applicable to adapters in either master or slave modes, and operates with cables that either have channels A and B aligned with channels C and D crossed or channels A and B crossed and channels C and D aligned. Cables of different configurations can be switched at any time without impacting network operation. In addition, a mechanism for 1000BASE-T adapters to support multiple scrambling methods between the adapter and its link partner is described.12-03-2009
20130064072PROACTIVE SOURCE-BASED REVERSE PATH VALIDATION IN COMPUTER NETWORKS - In one embodiment, a network device may receive an indication of a particular future message time, and determines a path validation time that is prior to the particular future message time by an amount at least long enough to detect and report a route change of a path from the network device to a source of the particular future message, wherein the source utilizes the path in reverse to reach the network device for the particular future message. Accordingly, the network device sends, at the path validation time, a keepalive message on the path, where in response to a failure of the keepalive message on the path, the network device repairs the path to the source with a particular route change, and reports the particular route change to the source, e.g., such that in response, the source may transmit the particular future message on the changed path in reverse.03-14-2013
20130064075METHOD, SYSTEM, AND DEVICE FOR MANAGING ADDRESSES ON ETHERNET RING NETWORK - The present invention discloses a method, system, and device for managing addresses on an Ethernet ring network. The method includes: receiving, by a master node on an Ethernet ring network, a failure message from a node connected to at least one of two ends of a failed link on the Ethernet ring network; determining, according to the failure message, a specific virtual local area network affected by the failure on the Ethernet ring network; and sending an instruction message for flushing a media access control address forwarding table to a specific node accessed by the specific virtual local area network on the Ethernet ring network, where the instruction message carries an identifier of the specific virtual local area network, so that the specific node deletes addresses related to the specific virtual local area network.03-14-2013
20130064074BREAK BEFORE MAKE FORWARDING INFORMATION BASE (FIB) POPULATION FOR MULTICAST - A method of installing forwarding state in a link state protocol controlled network node having a topology database representing a known topology of the network, and at least two ports for communication with corresponding peers of the network node. A unicast path is computed from the node to a second node in the network, using the topology database, and unicast forwarding state associated with the computed unicast path installed in a filtering database (FDB) of the node. Multicast forwarding state is removed for multicast trees originating at the second node if an unsafe condition is detected. Subsequently, a “safe” indication signal is advertised to each of the peers of the network node. The “safe” indication signal comprises a digest of the topology database. A multicast path is then computed from the network node to at least one destination node of a multicast tree originating at the second node. Finally, multicast forwarding state associated with the computed multicast path is installed in the filtering database (FDB) of the network node, when predetermined safe condition is satisfied.03-14-2013
20130064073ARCHITECTURE AND PROTECTION METHOD FOR MESH PROTECTION OF N SERVICES WITH M SHARED RESOURCES - The embodiments disclosed herein provide a mechanism for sharing protection resources in an arbitrary network topology involving pre-computing the protection resources so that data-plane-based protection can be used to activate the protection resources upon detection of a failure, thus, providing faster switching times than typical control-plane-based solutions. This is accomplished by configuring a mesh network to include, for a working path in the network, one or more protection paths with the same end nodes as the working path, where each protection path includes at least one intermediate node that is not part of the working path. The intermediate node accepts a protection request from one of the end nodes and determines whether a local resource for a protection path is available. If the local resource is available, the intermediate node forwards the protection request along the protection path, but, if the local resource is unavailable, the intermediate node notifies the end node from which the protection request originated that the protection path is unavailable.03-14-2013
20120230184Signaling Extension for a Label Switched Path Over a Composite Link - An apparatus comprising an end point coupled to a peer end point via a composite link comprising a plurality of component links and configured to signal the peer end point to indicate an aggregated label switched path (LSP) established on the composite link and one of a plurality of data flow identifiers for the aggregated LSP, wherein the aggregated LSP and a data flow identifier field are signaled from the end point using a signaling protocol. Also disclosed is a method implemented by a network component comprising receiving using a receiver a message comprising a Type-Length-Value (TLV) that indicates that a LSP established on a composite link with a peer end point is an aggregated LSP, and receiving in the TLV a plurality of inner labels that correspond to a plurality of data flows of the aggregated LSP.09-13-2012
20110032818PATH CONTROL DEVICE, PATH CONTROL METHOD, AND PATH CONTROL PROGRAM - A path control device included in a terminal device (02-10-2011
20120033548CLIENT QoS BASED CONNECTION SESSION JOGGING - A communication device, comprising communication interface circuitry, processing circuitry coupled to the communication interface circuitry, and a user interface coupled to the processing circuitry, interacts with a remote device in a communication infrastructure that supports multiple possible communication pathways such as first and second communication pathways between the communication device and the remote device. A data exchange relating to at least a voice delivery service is initiated by the processing circuitry over the first communication pathway. A jog input indication is generated during the data exchange via the user interface in response to a user input, and delivered to the processing circuitry. The jog input indication is indicative of dissatisfaction of the user with ongoing performance of the first communication pathway in the data exchange. In response to the jog input indication received, the processing circuitry switches the data exchange from the first communication pathway to the second communication pathway.02-09-2012
20090067324Resilient Data Communications with Physical Layer Link Aggregation, Extended Failure Detection and Load Balancing - Rapid channel failure detection and recovery in wireless communication networks is needed in order to meet, among other things, carrier class Ethernet channel standards. Thus, resilient wireless packet communications is provided using a physical layer link aggregation protocol with a hardware-assisted rapid channel failure detection algorithm and load balancing, preferably in combination. This functionality may be implemented in a Gigabit Ethernet data access card with an engine configured accordingly. In networks with various topologies, these features may be provided in combination with their existing protocols.03-12-2009
20110286327Method, Apparatus, and System for Processing Radio Link Failure - A method for processing radio link failure (RLF) is disclosed. When a user equipment (UE) communicates with a network through two or more carriers, if a downlink RLF occurs on at least one of the two or more carriers, the UE determines whether there is a carrier among the two or more carriers on which no downlink RLF occurs. The UE stops sending information on an uplink dedicated physical control channel (DPCCH) of the carrier on which the downlink RLF occurs if there is a carrier on which no downlink RLF occurs.11-24-2011
20110286326Communication system, forwarding node, path management server, and communication method - A communication system comprises: a path management server that generates a plurality of forwarding path information items each includes a sequence of identifiers, each of which identifies a communication interface provided in each of a plurality of forwarding nodes on a forwarding path in a data forwarding network or a link established between the forwarding node and a neighboring node thereof; and a forwarding node that, in accordance with at least one of the plurality of forwarding path information items, executes a packet forwarding processing of a packet with a header including the plurality of forwarding path information items.11-24-2011
20130021899M-PAIR MODE PROTECTION SWITCHING - A communication comprises a plurality of digital subscriber line (DSL) links, a first node having at least one application port configured for an elastic service and a plurality of DSL ports, and a second node having at least one application port configured for an elastic service and a plurality of DSL ports. Each of the first and second nodes is configured to interleave data received over the at least one application port across the plurality of DSL ports, each DSL port allocated a set of DSL timeslots for transport of the data received over the at least one application port. When a failure is detected on one of the DSL links, each of the first and second nodes is configured to interleave the data received over the at least one application port across the remaining DSL ports not connected to the failed DSL link without adjusting the set of DSL timeslots allocated to each of the remaining DSL ports for transport of the data from the at least one application port.01-24-2013
20120099425NETWORK DEVICE AND METHOD FOR ESTABLISHING PATH DATA - A network device and a method for establishing path data are provided, the network device is connected to a network to receive and send a signal, and records a MAC table data and a ring port table data. The MAC table data comprises at least one path data. Each path data includes a device MAC address information and a first identification. When a path of the network is interrupted, the network device adjusts a second identification of ring port information of the ring port table data. The ring port information is corresponding to the network. When the network device obtains a data frame, a destination path data matched with the data frame is obtained from the MAC table data, and a first identification corresponding to a connection port of the destination path data is compared with the second identification to decide an output port for the data frame.04-26-2012
20120099424DYNAMIC LINE MANAGEMENT - A Digital Subscriber Line Access Multiplexor (DSLAM) for operation within an access network includes a plurality of digital subscriber line modems for terminating a plurality of corresponding digital subscriber lines and aggregating them for onward connection through the access network. The DSLAM is operable, each time a data connection is established or re-established over one of the digital subscriber lines, to generate line data about the data connection at the DSLAM, to store the line data, to wait a predetermined period of time, to determine if the data connection is still operating successfully since the establishment of the connection without having suffered loss of connection during the predetermined period and then to transmit the line data to a management device 04-26-2012
20120002538Method, Apparatus, and System for Processing Radio Link Failure - A method for processing radio link failure (RLF) includes, when a user equipment (UE) communicates with a network through two or more carriers, if downlink RLF occurs on at least one of the two or more carriers, determining whether there is a carrier on which no downlink RLF occurs, among the two or more carriers, and sending a message to the network through a dedicated control channel (DCCH) of the carrier on which no downlink RLF occurs if there is the carrier on which no downlink RLF occurs, wherein the message carries information of at least one of a carrier and a cell on which RLF occurs and instructs the network to perform RLF processing for the carrier on which the downlink RLF occurs, or stopping sending information on an uplink dedicated physical control channel (DPCCH) of the carrier on which the downlink RLF occurs.01-05-2012
20110299387SURVIVABLE AND RESILIENT REAL TIME COMMUNICATION ARCHITECTURE - Enhanced communication systems with various resiliency and survivability aspects are provided. Data center, cluster, network, and load balancer survivability are provided for seamless communication experience in case of data center, cluster, discovery infrastructure, or hardware load balancer failures. Call, data, and authentication survivability are provided through dynamic re-routing over alternative networks, continuous data replication, and alternative authentication mechanisms. Seamless failover is ensured through use of identical signaling protocols and data carried by protocols between primary and backup clusters. Voicemail resiliency is achieved by re-routing calls directed to voicemail over alternative paths such as PSTN connections.12-08-2011
20120106323NETWORK SYSTEM - A link control function unit 05-03-2012
20110032817Method, Apparatus and Communication System for Protecting Signaling Transmission - The present invention discloses a method, an apparatus, and a communication system for protecting signaling transmission, relates to the communication field, and enables end-to-end signaling protection. In an embodiment of the present invention, a primary signaling path and at least one secondary signaling path are created between terminals; the transmission protocol of the primary signaling path is different from the transmission protocol of the secondary signaling path, and the secondary signaling path works instead when the primary signaling path is in an abnormal state. The embodiments of the present invention are primarily applied to communication systems, and in particular, to the communication systems that support multiple transmission modes, for example, WCDMA system that supports IP bearers.02-10-2011
20100128601CLIENT QoS BASED CONNECTION SESSION JOGGING - Aspects of a method and system for a client QoS based connection session jogging are provided. While receiving a service over a particular delivery route, a user of a user device is provided with the capability to request an alternate route to continue to deliver the service via a user interface operation. The user device generates a connection handover (HO) request and transmits the request to a network management (NM) server. The NM server determines the alternate route and continues the service over the determined alternate route. The NM server supports both unsolicited and solicited connection HO request. A connection session profile associated with the particular delivery route is updated based on the determined alternate route information. The service is continued over the alternate route with the updated connection session profile. A connection HO request indicates a desired QoS from the user of the user device for the received service.05-27-2010
20090161537NETWORK DATA ROUTING PROTECTION CYCLES FOR AUTOMATIC PROTECTION SWITCHING - A computer network processes data packets in the event of a network link failure. The network includes a plurality of routers that deliver data packets to the network via a plurality of links. At least one router includes a protection cycle manager. The protection cycle manager has a protection cycle packet identifier and a protection cycle packet processor. The protection cycle packet identifier identifies, as protection cycle packets, data packets having a specific protection cycle format. The protection cycle packet processor processes protection cycle packets to determine whether the packet destination corresponds to the routing node, and if the packet destination corresponds to the routing node, the protection cycle packet is treated by the routing node as a data packet received from the packet source via the failed link. Otherwise, if the packet destination does not correspond to the routing node, the protection cycle packet is sent to a protection cycle node for the routing node.06-25-2009
20100265819TELECOMMUNICATION NETWORK - A telecommunications network (10-21-2010
20100091646METHOD OF REDUNDANCY OF RING NETWORK - A ring network redundancy method is disclosed. If somewhere the connection of the ring network is damaged and broken, then the state of an initially blocked port that has been assigned as blocked is set as forward so as to keep the network functioning. And after the problem is repaired, a newly assigned blocked port is then assigned so that there is now once more a blocked ported; wherein the position of this newly assigned blocked port is set directly at one of the two ends of the repaired network line. Thereby the resettling time for the position of the newly assigned blocked port is reduced, thus the ring network system becomes much more stable.04-15-2010
20100091647Method for Restoration and Normalization in a Mesh Network - The present invention is directed to methods for signaling that enable bandwidth reservation, path restoration, path normalization, and path removal in a mesh network that supports shared mesh restoration.04-15-2010
20100091648METHOD, DEVICE AND SYSTEM FOR PROTECTING MULTICAST TRAFFIC - A method, a device, and a system for protecting a multicast traffic in the field of mobile communication are provided. A backup path is set up for a path that needs to be protected. Route information of the backup path is pre-stored in an entry of a route table. When a failure of the path is detected, a traffic is switched from the failed path to the backup path. By setting up a unicast tunnel or a multicast tunnel as the backup path for a working path in the multicast in advance, and by adding a backup path port as an ingress port of an entry of the route table, it realizes to switch a data flow to the backup path at a forwarding layer without being detected by a user when the working path failure occurs, realizes a fast convergence, and does not influence a user experience, thereby effectively reducing the influence on the user experience when the failed path is restored in a point-to-multipoint service.04-15-2010
20100091649REPORTING DIAL UP ACCESS PROBLEMS USING A REAL-TIME AUTOMATED SYSTEM - A server for automatically handling dial-up connectivity problems via a voice connection can include a controller to interface with a caller during a voice call, query a network operations center using a data connection to determine whether a dial-up number associated with the caller and received by the server is out of service, and present alternative dial-up numbers during the voice call without prompting the caller for further information. Other embodiments are disclosed.04-15-2010
20110194406METHOD FOR PROCESSING THE BEARING REESTABLISHMENT FAILURE - A method for processing bearer reestablishment failure is disclosed in the present invention for preventing a SGW from doing error processing due to the bearer reestablishment failure in a SAE network. The method comprises the following steps: a mobility management entity (MME) sending a notification message to a service gateway (SGW) after reestablishment of a bearer, the notification message carrying effectiveness parameters indicating the effectiveness state of the bearer, and the SGW storing the effectiveness parameters; the SGW not delivering data packets if the effectiveness state of the bearer is failure when the SGW is to deliver data packets.08-11-2011
20090168645Automated Network Congestion and Trouble Locator and Corrector07-02-2009
20090168646METHOD, APPARATUS AND SYSTEM FOR AVOIDING LOOP IN ETHERNET RING - A method for avoiding loop in an Ethernet ring includes, preventing, by transmit nodes constituting a ring, themselves from using the data frame transmission capabilities of ports on a link affected by a failure, when the ring failure has been detected by a transmit node constituting a ring; obtaining, by a master node of the ring, the ring failure, and performing a protection switching operation; flushing, by transmit nodes, their own forwarding tables, and forwarding a frame according to the flushed forwarding tables. If the failure in the ring has been removed, the master node shifts to a normal state and transmit nodes restore their data frame transmission capabilities of ports on a link ever affected by a failure. A system and an apparatus for avoiding data loop in an Ethernet ring are also disclosed.07-02-2009
20090168644MAINTAINING COMMUNICATION CONTINUITY - A plurality of communication channels are monitored to detect a failed communication channel. In response to detecting the failed communication channel, failover instructions are generated concerning an alternative communication channel. The failover instructions are provided to one or more client electronic devices.07-02-2009
20090147674LOOP PREVENTION TECHNIQUES USING ENCAPSULATION MANIPULATION OF IP/MPLS FIELD - In one embodiment, an edge device communicates with a neighboring routing domain. A failure that prevents communication between the edge device and the neighboring routing is detected. When the edge device thereafter receives a data packet that is directed to the neighboring routing domain, it determines if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain. If the received data packet was not rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device reroutes the received data packet to another edge device for forwarding to the neighboring routing domain. However, if the received data packet was rerouted to the edge device from another edge device coupled to the neighboring routing domain, the edge device prevents the received data packet from being rerouted a second time to prevent loops.06-11-2009
20090080326RSVP-TE enhancement for MPLS-FRR bandwidth optimization - RSVP-TE Enhancement for MPLS-FRR Bandwidth Optimization is a method of RSVP-TE protocol enhancement for optimizing network resources when FRR is protecting LSP traffic in a topology where the bypass LSP tunnel traverses the original previous hop(s) of the protected LSP. The node providing FRR protection, the PLR, will use the enhanced message TLVs to report to the nodes all the way back to the HE node. The node(s) on the original path prior to the PLR node can check if there is a better alternative bypass tunnel to use to provide FRR from a network resource optimization perspective (such as using the bypass tunnel from the HE node in a ring topology to reduce the traffic in the ring).03-26-2009
20090147672PROTECTION SWITCHING METHOD AND APPARATUS FOR USE IN RING NETWORK - A protection switching method and apparatus for use in a ring network are provided. At least two switching request signals are received from a network device neighboring a link in which a failure occurs. A switching operation is performed in response to a first received signal of the at least two received switching request signals. When a network failure occurs, fast protection switching can be performed.06-11-2009
20090141622PINNING AND PROTECTION ON LINK AGGREGATION GROUPS - A device may assign a virtual local area network (VLAN) to one or more specific links in a link aggregation group (LAG), and send traffic from the VLAN on the assigned one or more specific LAG links. Traffic from the same VLAN may be sent on one link in the LAG by selecting a hashing criterion or by pinning the VLAN to a primary link in the LAG and another link for redundancy purposes.06-04-2009
20090310482Communication Node and Communication System - In a network wherein a data plane for communicating user data, and a control plane for managing data forwarders are configured of different media, the path teardown of the data plane which is forwarding the data is prevented when a fault has occurred in only the control plane. When the GMPLS controller of the control plane has detected refresh timeout with respect to an adjacent node (12-17-2009
20100118695SPECTRUM SENSING OF BLUETOOTH USING A SEQUENCE OF ENERGY DETECTION MEASUREMENTS - Certain aspects of the present disclosure provide techniques for detecting presence of a Bluetooth device in the vicinity of a WiFi device by sensing the spectrum of the Bluetooth device using a sequence of energy detection measurements, generating a test statistic based on the measurements and comparing the test statistic to a threshold.05-13-2010
20100118696TRANSMISSION APPARATUS, TRANSMISSION NETWORK, AND METHOD BEING EMPLOYED THEREFOR - A transmission apparatus searches a new protection path at the time point that a failure has occurred in a working path and the working path has been switched to a protection path, registers the searched protection path, and secures the working path and the protection path of which a ratio is one versus one at any time. The transmission apparatus includes a holding means for holding an initially-set working path and protection path, and a means for, based upon a content of the holding of the foregoing holding means, making a changeover to the above working path after the initially-set working path recovers from the failure.05-13-2010
20100260041LINK FAULT HANDLING METHOD AND DATA FORWARDING APPARATUS - A link fault handling method and a data forwarding apparatus are provided herein. The method includes: A first data forwarding apparatus keeps a neighboring relation with a second data forwarding apparatus after a link between the first data forwarding apparatus and the second data forwarding apparatus fails intermittently. The link between the first data forwarding apparatus and the second data forwarding apparatus fails intermittently in this way: A first fault detecting module in the first data forwarding apparatus receives no fault detection message from the second data forwarding apparatus at a preset time of receiving the message, but receives the fault detection message from the second data forwarding apparatus in an intermittency period after the preset time of receiving the message. The embodiments of the present invention shorten the convergence time of the upper-layer application module, improve the convergence performance, save CPU resources of the data forwarding apparatus, and improve working performance of the data forwarding apparatus.10-14-2010
20130021901Method For Protecting an Ethernet Ring From a Superloop Going Through The Ethernet Ring - The present invention relates to a method in an Ethernet ring for protecting the Ethernet ring from a superloop going through the Ethernet ring, wherein the Ethernet ring comprises at least one ring node and two interface nodes between the Ethernet ring and a VPLS-domain, the Ethernet ring further comprises a ring protection link, the method comprises the steps of: receiving in one of the interface nodes a withdrawal message intended to indicate that the other interface node is malfunctioning, the method being further characterized by the further step of; maintaining said ring protection link in the Ethernet ring in response to the withdrawal message.01-24-2013
20100085872Self-Healing Chip-to-Chip Interface - A method, apparatus, and computer instructions for managing a set of signal paths for a chip. A defective signal path within the set of signal paths for the chip is detected. Signals are re-routed through the set of signal paths such that the defective signal path is removed from the set of signal paths and sending signals using remaining data signal paths in the set of signal paths and using an extra signal path in response to detecting the defective signal path.04-08-2010
20120033546Method and System for Implementing Network Element-Level Redundancy - According to another embodiment, a method may include communicatively coupling a first network element to a second network element via a first link of a multi-chassis link aggregation group. The method may also include communicatively coupling the first network element to a third network element via a second link of the multi-chassis link aggregation group. The method may additionally include communicatively coupling the second network element to a fourth network element via a first path of a point-to-point network. The method may further include communicatively coupling the third network element to the fourth network element via a second path of the point-to-point network. The method may also include configuring the first path and the second path as paths of a linear protected switching connection such that traffic associated with a service and communicated between the first network element and the fourth network element via the first link and the first path may be switched over to the second link and the second path in response to an event.02-09-2012
20090207728CONSTRUCTING REPAIR PATHS AROUND MULTIPLE NON-AVAILABLE LINKS IN A DATA COMMUNICATIONS NETWORK - A data processing apparatus is configured for initiating a not-via approach for creating repair path information for a first link between the first network node and a second network node; creating a list of other network nodes that the not-via repair path traverses; creating and storing entries in the FIB identifying repair addresses for the network nodes and that cause (a) packets directed to all addresses normally reachable through the first link to be encapsulated to the second node not via the first node, (b) packets directed to a not-via address that is normally reachable through the first link to be encapsulated to the second node not via the first node, and (c) dropping packets directed to a not-via address that is normally reachable through the first link when the not-via address is in the list; repeating the preceding steps for all other links of the first network node.08-20-2009
20100080119Method for restoring connections in a network - The present invention relates to a method for restoring connections in a network, in particular in a telecommunication network, the network being provided with a data plane, a control plane and a number of nodes (04-01-2010
20090190469COMMUNICATION DEVICE, NETWORK SYSTEM, PATH MANAGEMENT METHOD, AND PROGRAM - This is invention is to provide a communication device, a network system, a path management method, and a program in which a state of a path which has been set can be recognized in a case where the path has been set by autonomous distributed control via an autonomous distributed control non-supporting device in a network including both an autonomous distributed control supporting device and an autonomous distributed control non-supporting device. An autonomous distributed control supporting device as a main component includes virtual link information managing means for managing virtual link information indicating a virtual link in association with alarm information indicating a state of the virtual link, the virtual link being a route through an autonomous distributed control supporting device and an autonomous distributed control non-supporting device, path setting means for setting an autonomous distributed control path in the virtual link, collecting means for collecting POH information or SOH information of SONET/SDH from the autonomous distributed control path, and updating means for updating the alarm information managed by the virtual link information managing means based on alarm information included in the POH information or SOH information collected by the collecting means.07-30-2009
20110199895METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR DIAMETER NETWORK MANAGEMENT - According to one aspect, the subject matter described herein includes a method for providing Diameter network management information in a communications network. The method includes steps occurring at a Diameter signaling router (DSR). The method also includes determining whether successful Diameter communications are available with a first Diameter application. The method further includes in response to determining that successful Diameter communications are not available with the first Diameter application, generating a first Diameter network management message (DNMM) indicating that successful Diameter communications are not available with the first Diameter application. The method also includes sending the first DNMM to a second Diameter node.08-18-2011
20090274042NETWORK BASED SWITCHOVER TO ORIGINAL CONTENT AFTER AD-INSERTION DEVICE FAILURE - In one embodiment, a network device joins a first multicast tree to receive post-ad-inserted video content. The network device also joins a second multicast tree to receive the pre-ad-inserted video content. The content from the first multicast tree is forwarded by the network device to the receiver(s). The network device determines if it does not receive the content on the first multicast tree due to any failure, in which case, it delivers the content from the second multicast tree to the receiver(s). This enables the receiver to receive the original (pre-ad-inserted) content during the failure in first multicast tree. When the failure is resolved, the network device can go back to sending the content from the first multicast tree to the receiver(s).11-05-2009
20120106324Handling of Access Capability Information in a Mobile Network - In a mobile network with a plurality of access networks (05-03-2012
20120106322TECHNIQUE ESTABLISHING A FORWARDING PATH IN A NETWORK SYSTEM - A method and network for determining an interconnect node for establishing a forwarding path for service based data within a network system. The method includes assigning, interconnect node status information to network interconnect nodes, wherein a network interconnect node to which a passive status is assigned is only allowed to transmit service based data between an external link and another interconnect node of the network, or between two other interconnect nodes of the network. Only a network interconnect node with active status is allowed to send or receive service based data to or from the network. The method includes determining, for a given service, an interconnect node with active status for establishment of a forwarding path including the interconnect node with active status and an external link, wherein the determination is based on the respective status information assigned to the network interconnect nodes for the service.05-03-2012
20090201806ROUTING FAILOVER WITH ACCURATE MULTICAST DELIVERY - A node comprising: an ingress port configured to receive data; a plurality of egress ports configured to transmit data; a routing table configured to provide, at least part of, both a preferred routing path and a recovery routing path; a data tag engine configured to read a tag, associated with the data, that indicates the routing state of the data and, based at least in part upon the tag determine whether to use the preferred routing path or the recovery routing path for a selected path, and determine if the tag is to be modified to indicate a change in the routing status of the data; and a routing engine configured to utilize the selected path to determine the egress port from which to transmit the data.08-13-2009
20110170407SYSTEM AND METHOD FOR DELIVERY OF PACKETS - A system and method for delivery of packets is provided. In an embodiment, a client is operable to query a first layer of the protocol stack used to provide a link that carries packets for said client. Based on the query, the client is operable to adjust how those packets are delivered over another layer of the protocol stack in order to help improve the likelihood of successful delivery of those packets.07-14-2011
20090274043MULTI-LEVEL INTERCONNECTION NETWORK - A method and system for providing a multi-level interconnection network is provided. A multi-level interconnection network comprises basic cells that are aggregated into higher level cells at each level of the network. At the first level, the basic cells are aggregated into first level cells. Each first level cell is an aggregation of a number of basic cells that is one more than the number of devices in a basic cell. The basic cells of a first level cell are fully connected; that is, each basic cell has a first level link or connection to each other basic cell. In a first level cell, each device of a basic cell has a first level link to each other basic cell. The multi-level interconnection network has higher level cells that are aggregations of lower level cells in a similar manner.11-05-2009
20090296571SYSTEM, METHOD AND PROGRAM FOR DETERMINING FAILURE IN NETWORK COMMUNICATION - System, method and program product for determining a cause of a failure of a communication from a source device to a destination device. A preferred route from the source device to the destination device comprises a series of routers in a forward order. First program instructions determine one or more initial routers in the series in the forward order from the source device toward the destination device. A last of the initial routers does not designate a next router in the series in the forward order toward the destination device. Second program instructions determine the series of routers in a reverse order from the destination device toward the source device. Third program instructions determine from the series of routers in reverse order as determined by the second program instructions which router the last of the initial routers should designate as its next router in the forward order toward the destination device, and send a notification as to which router the last of the initial routers should designate as its next router in the forward order toward the destination device.12-03-2009
20100110882Method and Apparatus for Implementing Automatic Protection Switching Functionality in a Distributed Processor Data Router - An automated-protection-switching (APS) software suite for distribution over multiple processors of a distributed processor router has an APS server module running on a first one of the multiple processors for managing communication and distributing configuration and state information and APS client modules running on second ones of the multiple processors, the APS client modules for monitoring interface state information, reporting to the APS server application, and for negotiating with other APS client modules. The software is characterized in that APS interface relocation from a primary interface to a backup interface is performed through direct communication between the APS client modules running on the processors supporting the involved interfaces.05-06-2010
20100110881METHOD FOR PROTECTION SWITCHING IN ETHERNET RING NETWORK - Provided is a protection switching method via forwarding table correction in an Ethernet ring network. Upon detecting a failure in a link, a node generates a protection switching frame including an address list of a forwarding table corresponding to a port connected to the link, and transmits the protection switching frame to a port at an opposite direction of the link. A node that receives the protection switching frame deletes its own address from the address list included in the protection switching frame, and changes a port number of an address in the address list of the protection switching frame from among addresses of the forwarding table corresponding to a port that received the protection switching frame to a port number in an opposite direction of the port that received the protection switching frame or deletes the port number of the address in the address list.05-06-2010
20100061230METHOD AND NETWORK DEVICE FOR FAST SERVICE CONVERGENCE - A method and network device for fast service convergence, used for communications between Autonomous Systems, includes: presetting a route forwarding table, each forwarding table item in the forwarding table includes information of a preferred route and a secondly-preferred route; setting the status of the preferred route as unavailable in the forwarding table item after a failure is detected in the preferred route; after receiving a service packet, querying in the route forwarding table the forwarding table item corresponding to the service packet, and determining whether the status of the preferred route is available, and if yes, the service packet is forwarded through the preferred route, otherwise through the secondly-preferred route. Because the failure detection time is not longer than 30 ms, the switch time of the service packet from the preferred route to the secondly-preferred route may be within 50 ms, thereby enabling fast service convergence.03-11-2010
20080239947METHOD AND APPARATUS FOR FAILURE RESILIENT FORWARDING OF DATA OVER A COMPUTER NETWORK - In one embodiment, the present invention is a method and an apparatus for failure-resilient forwarding of data over a computer network. In one embodiment, a marker is introduced into the data stream, e.g., at the sending node, and allows, in turn, forwarding nodes and/or receivers to efficiently track data stream reception. The marker functions as a checkpoint for the data transport process, and is identified and indexed at each forwarding node and receiver. Each receiver saves the marker prior to delivering data to an application, thereby designating a point in the data stream at which all preceding data is confirmed to have been delivered to the application. Thus, if a forwarding node fails, the receiver may request stream data from an alternate forwarding node by specifying to the alternate forwarding node to provide data starting from the marker.10-02-2008
20090109843SERVICE PROTECTING SWITCHING METHOD, SYSTEM AND DEVICE IN A CONNECTIONLESS NETWORK - A method for service protection switching in a connectionless network is provided. The method includes detecting if there is any failure which may have occurred on the respective path in the working flow domain and protection flow domain, coupled between the protection switching point and each of the at least two remote protection switching points. If any failure occurs on a path in one of the working flow domain and the protection flow domain, the service delivered via the failure-occurred path is switched to a path in the other flow domain for further delivery, where the path in the other flow domain is coupled to the remote protection switching point which is located on the failure-occurred path. A system and a device for service protection switching in a connectionless network are further provided such that the protection switching can be done on a path-by-path basis. Accordingly, the flooding problem caused by the protection switching is avoided effectively.04-30-2009
20080285441INTELLIGENT LOAD BALANCING AND FAILOVER OF NETWORK TRAFFIC - A hash engine in a network device driver maintains data on the utilization and error rate for each network interface card (“NIC”) within a local computing device. From this data, the hash engine intelligently selects transmit NICs and receive NICs based on various networking parameters provided from a software driver program. Transmit packets sent from the operating system in a local computing device to a remote computing device are intercepted, modified and redirected to transmit NICs selected by the hash engine for transmission to remote computing devices. Similarly, address resolution protocol (“ARP”) response packets sent by the operating system in response to ARP request packets are intercepted, modified and redirected to receive NICs selected by the hash engine for transmission. By selecting receive NICs and transmit NICs in this fashion, the hash engine is able to intelligently load balance transmit and receive traffic in the local computing device, thereby improving overall network performance relative to prior art techniques.11-20-2008
20110007629RAPID ALTERNATE PATHS FOR NETWORK DESTINATIONS - Network traffic is sent via alternate paths in cases of network link or node failure. An alternate node responds to U-Turn traffic from a primary neighbor to select a further alternate. An algorithm for determining the alternate paths is provided to select loop-free neighbors.01-13-2011
20080285442Vpls Remote Failure Indication - A method for communication includes provisioning different first and second instances of a multipoint-to-multipoint (MP-MP) communication service over respective first and second alternative sets of links (11-20-2008
20090147673STORAGE SYSTEM AND ROUTE SWITCH - A storage system includes a route switch, connected to at least two different communication lines different in path between each of switches and the route switch. Upon detecting a fault on a communication line extending to the switch, the route switch converts a destination address of a frame into a modified address in accordance with an address conversion table. The route switch thus controls a frame exchanged between a calculation device and each of the switches.06-11-2009
20100142369SYSTEMS AND METHODS TO REROUTING INTERNET PROTOCOL TRAFFIC BASED ON NETWORK USER PREFERENCES - Example systems, apparatus, and methods to reroute Internet Protocol traffic based on network user preferences are disclosed. A disclosed example method includes detecting a network defect in a first communication path, receiving IP traffic associated with a network user at a router, wherein the IP traffic is to be routed by the router over the first communication path, and buffering the IP traffic associated with the network user during a first time period having a first duration defined by the network user.06-10-2010
20120092985TEN GIGABIT ETHERNET PORT PROTECTION SYSTEMS AND METHODS - The present disclosure provides protection systems and methods for Ethernet ports. In particular, the present invention may provide a form of facility protection for any two facilities, located on any two cards. The facilities are provisioned as a protected pair and using automatic ITU-T Y.1731 control frames for control. In an exemplary embodiment, provisioning includes creation of an L2 protection service and associating it to a pair of facilities. One facility is identified as a working facility and the other as a protection facility. Under normal conditions (i.e., no facility fault), the working facility is in an active state and not conditioning while the protection facility is in a standby state and transmitting conditioning to subtending equipment. If a facility fault is detected at the working facility, then the working facility transmits condition Remote Fault (RF) and the protection facility removes it's transmit conditioning and becomes the active facility.04-19-2012
20100271936Pre-Computing Alternate Forwarding State in a Routed Ethernet Mesh Network - A set of critical nodes or links is identified on the network and alternate forwarding state is pre-computed and disseminated within a node such that, upon failure of one of the critical nodes/links, a minimal trigger will cause the alternate forwarding state to be used to forward traffic on the routed Ethernet mesh network. In one embodiment rather than storing full tables of alternate forwarding state, only the changes to the forwarding state required by an identified failure is stored by the network nodes. Upon occurrence of a failure on the network, the identified failure is used to select the alternate forwarding state.10-28-2010
20090185484RAPID RESPONSE METHOD FOR THE FAILURE OF LINKS BETWEEN DIFFERENT ROUTING DOMAINS - The invention relates to a rapid response method for the failure of a link between two routing domains in a packet-oriented network. Once the failure of a link has been identified, substitute routes are provided for the interrupted routes by the local selection of alternative routes and by the propagation of messages along the substitute routes. In contrast to conventional inter-domain protocols such as the BGP (Iborder gateway protocol) the transmission of messages and the associated modification to the routing only involves routing domains that lie along the replacement routes. In one embodiment, a network-wide propagation of messages takes place if the failure of the link represents a persistent breakdown. As a consequence, optimal routes are re-determined in the entire network. The invention provides breakdown compensation that is appropriate for temporary breakdowns and prevents instabilities that occur as a result of the use of conventional inter-domain protocols.07-23-2009
20090129262Transmission device - A transmission device includes a synchronous transmission network interface section, a switch section, first and second LAN interface sections, a distribution section, and a transmission and reception section, and said second LAN interface section includes a de-mapping section, a transmission and reception section, a collection section, and a mapping section.05-21-2009
20120069735WIRELESS COMMUNICATION SYSTEM - A wireless communication system includes a relay station, first and second wireless base stations, a gateway device, and a mobile station. The gateway device is connected to the first and second wireless base stations by a cable. The first and second wireless base stations are interconnected by a cable. The relay station is connected wirelessly to the first wireless base station to perform relayed communication via the first wireless base station. When the mobile station at a lower level than the relay station executes handover to the second wireless base station, the first wireless base station switches a data transfer route by redirecting data which is not yet completely transmitted to the mobile station, to be forwarded to the second wireless base station.03-22-2012
20120069734IMPLEMENTING EXCHANGE OF FAILING LANE INFORMATION FOR FAULT-TOLERANT COMMUNICATION LINKS - A method and circuit for implementing exchange of failing lane information for fault-tolerant communication links, and a design structure on which the subject circuit resides are provided. An ordered set for lane and link training includes a novel lane mask field for lane and link training. Ordered sets are exchanged during lane and link training for a fault-tolerant communication link to establish synchronization between a transmitter and a receiver. In a link training step, the bus link layer exchanges an ordered set with a plurality of bits of lane mask information included in predefined bytes, such as bytes 03-22-2012
20130182561Method Of Simple And Efficient Failure Resilient Load Balancing - A resilient load balancing method uses fixed paths and a fixed path-splitting strategy to enable ingress routers to efficiently reroute traffic after a failure. An off-line management system computes a set of fixed paths and a set of splitting ratios for routing demand from ingress routers to egress routers, with sufficient capacity to meet demands under each failure scenario. That data is then used by the ingress router to reroute demand after observing a failure.07-18-2013
20130182560Modem-Router Unit, Access Node, and Method of Enabling Communication With a Packet Switched Network - The present invention provides a primary modem-router for enabling communication between user equipment and a home network. The primary modem-router comprises an access communication unit for enabling a connection with said home network, and a wireless communication unit. The primary modem-router further comprises a line monitoring unit for monitoring connection quality of the connection with the network. The line monitoring unit provides a connection failure signal upon detection of insufficient connection quality. A processing unit of the primary modem-router is arranged for receiving the connection failure signal, and for establishing a wireless connection with a further modem-router unit upon receipt of this signal. This enables communication with the home network. The invention further provides an access node and method of enabling communication with a network.07-18-2013
20130121138SYSTEM AND METHOD TO ACHIEVE SUB-SECOND ROUTING PERFORMANCE - A system and method for routing data, the system having a processor, an interface in communication with the processor and capable of being in communication with a second system for routing data, a memory unit in communication with the processor, the memory unit having a network routing table having a plurality of routes, the plurality of routes having a first route; and a network failure route selection logic including instructions adapted to configure the processor to determine when the first route is inoperative, transmit a first data packet to the second system for routing data when the first route is inoperative and utilize a second route selected from one of the plurality of routes, the second route being different from the first route.05-16-2013
20110141884TRANSFER OF CONNECTIONS TRIGGERED BY A MME IN CASE OF FAILURE OF A SERVING GATEWAY - A serving gateway support node (06-16-2011
20110141883MULTI-LANE CONTROL APPARATUS AND METHOD USING CONTROL SIGNAL OF PHYSICAL LAYER - A multi-lane control apparatus and method using a control signal of a physical layer are provided. The multi-lane control apparatus includes a detector to detect a fault in a first transmission lane of a reciprocal module and to generate a loss signal of a first reception lane that is physically connected to the first transmission lane, and a controller to turn off a second transmission lane corresponding to the first reception lane in response to the loss signal.06-16-2011
20090201804Restoring aggregated circuits with circuit integrity checks in a hierarchical network - A system and method is disclosed that assures component circuits transported in aggregated circuits restore correctly after an aggregated circuit fault. The system and method implements component circuit tail segment integrity checks whenever an aggregated circuit is restored in a higher level of a network hierarchy. Switches at both ends of an aggregated circuit perform circuit integrity checks of the tail segments of every component circuit. A failure of the component circuit integrity check on any component circuit causes that component circuit to be released and restored end-to-end.08-13-2009
20090086624Multiple packet routing system (MPRS) - A method and system for Multiple Packet Routing is disclosed. A characteristic of a network may be monitored. Based on the characteristic, a network path of two or more redundant call streams sent from a first endpoint to a second endpoint may be controlled.04-02-2009
20090103431Method of Estimating Restoration Capacity in a Network - A method for estimating restoration capacity for a communication network includes a specified number of restoration paths, which can be maximally diverse from each other.04-23-2009
20080316920Apparatus and Method for Multi-Protocol Label Switching Label-Switched Path Protection Switching - Provided are system and method for multi-protocol label switching (MPLS) label-switched path (LSP) protection switching in an MPLS system employing a working LSP and a protection LSP in a 1:1 mode, the apparatus and method prepare a dedicated LSP for one working LSP and are capable of rapidly processing a forward defect indication (FDI)/backward defect indication (BDI) signal when a failure occurs on the working LSP. The system includes: an ingress node multicasting input MPLS traffic through the working LSP and the protection LSP using a fed-back BDI signal; a transit node relaying the MPLS traffic input from the ingress node, and generating a FDI signal when the failure occurs; and an egress node extracting the MPLS traffic from the MPLS LSP input from the transit node, and when the FDI signal is detected, inserting and feeding back the BDI signal to the ingress node through a return path and performing switching to the protection LSP.12-25-2008
20120195189SYSTEM AND METHOD FOR PROVIDING COMMUNICATION CONNECTION RESILIENCE - A system and method for providing communication connection resilience between a mobile subscriber device and a network, such as the Internet. In one aspect, the invention provides improved communication connection resilience by using multiple nodes in multiple chassis to create redundant communication routes and to provide redundancy for control data relating to a mobile subscriber device. In one embodiment, a first node resides in a first chassis and a second node resides in a second chassis, and when an active communication link between the mobile subscriber device and the network via the first node becomes disrupted, the active communication link is rerouted such that data is communicated between the mobile subscriber device and the network via both of the first and second nodes.08-02-2012
20100165834METHOD AND SYSTEM FOR RING TOPOLOGY DISCOVERY AND FORWARDING DATABASE FLUSH NULLIFICATION - A method and system for rerouting data in a communication network ring. The ring includes a plurality of nodes and a plurality of links. Each node includes a first port and a second port. Each first port is connected to a neighboring second port through a link of the plurality of links. The topology of the communication network ring is discovered and a forwarding database table is populated with static entries according to the discovered topology. Upon receiving notice of a failed link, which includes a source address of a node adjacent to the failed link, the topology and the source address of the node adjacent to the failed link is used to reconfigure the forwarding database table. Data is forwarded using the reconfigured forwarding database table without flooding the ring.07-01-2010
20120195190METHOD AND SYSTEM FOR SOLVING COMMUNICATION FAILURE AND TRAFFIC LOSS IN SERVICE PROTECTION NETWORKS - A method for solving communication failure includes transmitting user traffic over an automatic protection switching (“APS”) connection between a near network node and a far network node, determining that a protect path on the APS connection has failed, sending a message to the far network node that the protect path has failed, and switching user traffic to the working path at the near network node.08-02-2012
20100157792Method of Estimating Restoration Capacity in a Network - A method for estimating restoration capacity for a communication network includes a specified number of restoration paths, which can be maximally diverse from each other.06-24-2010
20090290487Communication apparatus and path switching method - In a communication apparatus on a network having ring topology and connecting plural communication apparatuses such that adjacent communication apparatuses are connected through plural lines, a first detecting unit detects failure occurring in a line included in a relay path set between the communication apparatus and another communication apparatus on the network. When the first detecting unit detects failure, a switching unit switches the relay path to a relay path connecting the communication apparatuses on the network in a direction opposite to the relay path originally set. A second detecting unit detects failure occurring in a line included in the relay path switched to by the switching unit; and when the second detecting unit detects failure, a resetting unit resets the relay path using a line where no failure has been detected.11-26-2009
20100188971Wireless Home Network Routing Protocol - A hierarchical wireless network is provided with a mesh backbone network portion and a switching tree network portion. The mesh backbone network portion includes first tier nodes each having at least one wireless link to another first tier node. The first tier nodes execute a link-state protocol for routing packets. The switching tree network portion includes second tier nodes each having a single wireless link to one first tier node and at least one wireless link to one third tier node, and third tier nodes each having a single wireless link to one second tier node. The second tier and the third tier nodes execute switching rules for switching packets.07-29-2010
20090316575MANAGEMENT OF UE OPERATION IN A MULTI-CARRIER COMMUNICATION SYSTEM - Techniques for managing operation of a user equipment (UE) in a multi-carrier system are described. The system may support two or more carriers on the downlink and one or more carriers on the uplink. One carrier on each link may be designated as an anchor carrier. In an aspect, a lower layer order (e.g., an HS-SCCH order) may be used to transition the UE between single-carrier and multi-carrier operation. In another aspect, the UE may have the same discontinuous reception (DRX) configuration for all downlink carriers and/or the same discontinuous transmission (DTX) configuration for all uplink carriers. In yet another aspect, HS-SCCH-less operation may be restricted to the anchor carrier.12-24-2009
20090316574PATH MAXIMUM TRANSMISSION UNIT DETERMINATION - Disclosed are techniques for determining a path maximum transmission unit (MTU) of a communication path connecting two or more nodes of a network. A node initiates a connection with a remote node by repeatedly transmitting increasingly-larger path MTU discovery messages until the size of a path MTU discovery message exceeds the link MTU of a link within the communication path. This results in the generation and transmission of an MTU error message back to the initiating node. The edge router linked to the initiating node generates a MTU change message in response to receiving the MTU error message and multicasts the MTU change message to all local nodes to which it is linked. The MTU change message directs the receiving nodes to update their destination caches to reflect the path MTU discovered through the use of the increasing-size path MTU discovery messages and the resulting MTU error message.12-24-2009
20130215738Reliability as an Interdomain Service - A system and techniques are disclosed that increase the redundancy (i.e., physical diversity and bandwidth) available to an IP network, thereby increasing the failure processing capability of IP networks. The techniques include pooling the resources of multiple networks together for mutual backup purposes to improve network reliability and employing methods to efficiently utilize both the intradomain and the interdomain redundancies provided by networks at low cost.08-22-2013
20100238799Method, Apparatus and Computer Program Product For Handover Failure Recovery - An apparatus for facilitating handover failure recovery may include a handover management element configured to receive, at a target node, a handover request from a source node regarding the handover of communications with a mobile terminal. The handover request may include identity information indicative of the mobile terminal. The identity information may be the identity information used to identify the mobile terminal to the source node during establishment of the original connection between the source node and the mobile terminal. The handover management element may be further configured to receive a request for a connection from the mobile terminal subsequent to a radio link failure and prior to handover completion. Based on matching the identity information from the request for connection and the identity information received from the source node, the target node may establish communication with the mobile terminal based on access stratum configuration information used by the source node.09-23-2010
20100226245METHOD AND APPARATUS FOR PROTECTION SWITCHING IN RING NETWORK - A method and apparatus for protection switching in a ring network are provided. A method for protection switching in a ring network, which includes a first ring network having first and second connection nodes and a second ring network connected with the first ring network through the first and second connection nodes, includes: receiving, by the first connection node, first and second R-APS messages transmitted from nodes belonging to the first ring network; determining, by the first connection node, the position of closure in the first ring network by using the first and second R-APS messages and topology information; receiving, by the first connection node, a topology change signal transmitted from the second ring network; and transmitting, by the first connection node, an FDB flush message with reference to the position of closure.09-09-2010
20100238800Method and Node Device for Fault Detection and Convergence in Ethernet - A method can be used for fault detection and convergence in an Ethernet. A link fault is detected according to the Operations, Administration, and Maintenance (OAM) protocol. Network convergence is performed by using a Layer 2 network protection protocol according to the type of the Ethernet after the link fault is detected.09-23-2010
20100238797Adaptive Subchannel Disabling in Beamformed Wireless Communication Systems - Techniques are provided herein to adaptively and independently disable use of subchannels in transmission sent from a first wireless communication device to a second wireless communication device. The first wireless communication device receives transmission sent to it by the second wireless communication device. The transmissions occupy some or all of a plurality of subchannels within a frequency band that are available for use in the transmission. The transmissions received at the first wireless communication device are evaluated in each subchannel for an over-the-air wireless link between the first wireless communication device and the second wireless communication device. Based on the evaluation, zero or more of the plurality of subchannels are independently disabled in transmissions that are sent by the first wireless communication device to the second wireless communication device.09-23-2010
20100254259METHOD AND SYSTEM FOR PERFORMING BLOCKING OF MESSAGES ON ERRORS IN MESSAGE STREAM - Described is an improved method, system, and computer program product for implementing an improved resequencer, along with related mechanisms and processes. An improved error handling method and system for messages is also described.10-07-2010
20100103814METHOD OF TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIMEDIA BROADCAST/MULTICAST SERVICE - A method of transmitting data in a wireless communication system supporting a multimedia broadcast/multicast service (MBMS) includes transmitting a data block for the MBMS through a main channel, and transmitting the data block through a sub-channel if an error report for the data block is received. Waste of radio resources is minimized by the use of a main channel while improving quality of the MBMS by restoring data by the use of a sub-channel.04-29-2010
20100208583PATH-LEVEL PROTECTION FOR DIGITALLY WRAPPED PAYLOADS - A node, of a group of nodes, may detect a failure on a first path; establish a connection associated with a second path when the failure on the first path is detected; store an identifier in a field in an overhead portion of a data frame when the failure on the first path is detected, the data frame including a payload portion that contains a client signal, the identifier instructing another one of the nodes to establish a connection associated with the second path; and transmit the data frame to the other one of the nodes via the second path.08-19-2010
20090245100LINE ACCOMMODATING DEVICE - A line accommodating device for accommodating lines of a first communication network and a second communication network, the line accommodating device includes an interface connecting to the first communication network; a connecting block for connecting to the interface; and a plurality of relay modules connecting to the connecting block and the second communication network, respectively, each of the relay module including a reporting unit for notifying the connected relay modules via the connecting block of identification information of the relay module's own, an obtaining unit for obtaining identification information of the connected relay modules via the connecting block, and a controller including processes of determining at least one connection target of the relay module in the properly obtained identification information of the relay module by the obtaining unit, and controlling for switching the connection target of the relay module in accordance with a determined result of the determining.10-01-2009
20090323521Transmission method and transmission apparatus in ring network - According to the transmission method, labels to be used at the failure occurrence are previously and individually set to links in respective directions among all nodes on the one directional link connecting between adjacent nodes basis, and when a failure occurs, a failure notifying message is sent out onto a same directional ring from a termination node of a failed block, to be sequentially transferred to each downstream node, and a label table for connecting the links in cooperative with the reception of the failure notifying message is created in each node, and also, a bypassing path is formed by turning back the rings at both end nodes of the failed block. Thus, in a ring network of label switching system, it becomes possible to easily perform the label table management and also to set a bypassing path in a short time at the failure occurrence.12-31-2009
20110032816Connection Failure Notification Method And Apparatus - An access point according to the present invention generates and broadcasts a notification message to the mobile devices serviced by an access point upon detection of a connection failure between the serving access point and a network node. The notification message controls the impact of the connection failure on neighboring cells by including redirect information that identifies one or more alternate access points for the affected mobile devices. The affected mobile devices subsequently attempt to access the access points identified by the redirect information. The notification message may also include timing information that informs the affected mobile devices when they may attempt to access an alternate access point identified by the redirect information.02-10-2011
20100296393METHOD FOR ESTABLISHING AN MPLS DATA NETWORK PROTECTION PATHWAY - Recovery time upon the failure of a link or switching system in an asynchronous data network can be minimized if downstream data switches provide upstream messages indicating to upstream switching system that the downstream traffic arrived in tact and was properly handled. Upon this loss or failure of the upstream status message to an upstream switching system, an upstream switching system can reroute data traffic around a failed link or failed switch with a minimal amount of lost data. The upstream status message is conveyed from a downstream switching system to an upstream switching system via a reverse notification tree data pathway. The reverse notification pathway is established by using a messaging protocol between network switches by which the working and protection paths, among other things, are established.11-25-2010
20100278041METHOD AND DEVICE FOR PROVIDING SERVICES FOR USER - A method and a device for providing services for a user are provided. The method includes receiving, by an interrogating call session control function (I-CSCF), a failure response returned by a first serving call session control function (S-CSCF) after the I-CSCF selects the first S-CSCF for the user according to a capability set of an S-CSCF returned by a home subscriber server (HSS) and forwards a service request to the first S-CSCF; obtaining, by the I-CSCF, information of a second S-CSCF, and forwarding the service request from the user to the second S-CSCF. Therefore, when multiple identities of the user simultaneously generate unregistered services, when they generate registration requests at the time of generating unregistered services, or when they simultaneously generate registration requests, the I-CSCF forwards the service request from the user to a corresponding S-CSCF for processing, thus enabling a network to normally provide services for the user.11-04-2010
20100302936TRANSIENT LOOP PREVENTION IN A HYBRID LAYER-2 NETWORK - In one embodiment, a first switch at a border between a first network of a first protocol (P1 network) and a first network of a second protocol (P2 network) is interconnected via the first P1 network with a second switch between a second P1 network (interconnected with the first P1 network) and a second P2 network. In response to detecting a merge of the first and second P2 networks, the first switch may: i) block data packets from traversing P1 network boundary ports of the first switch; ii) allow protocol messages to flow between the first and second P1 networks through the P1 network boundary ports of the first switch; iii) allow the first and second P1 networks to discover each other through the protocol messages and to prevent loops; and in response, iv) unblock the P1 network boundary ports of the first switch to allow traversal of data packets.12-02-2010
20110110225NETWORK TRAFFIC TRANSFER BETWEEN A RADIO BASE STATION NODE AND A GATEWAY NODE - A technique for transferring network traffic between a radio base station (RBS) node and a gateway (GW) node of a mobile telecommunications network is described. A method embodiment comprises the steps of providing a first transport link and a second transport link between the RBS node and the GW node. The first transport link is configured to transport network traffic of a higher priority and the second transport link is configured to transport network traffic of a lower priority. The method further comprises distributing network traffic over the transport links depending on an assignment between the transport links and priority settings associated with the network traffic.05-12-2011
20090067323Duplicate Transmission Path Switching Device - In switching by failure, no switching is performed when a packet of IP packet is lost or a packet has not arrived even when a predetermined time has elapsed, which are not recognized as a failure. There is provided a duplicate transmission path switching device for data packets having the same information configuration to a main transmission path and an auxiliary transmission path. The device includes a transmission failure monitoring unit for monitoring a transmission failure of the main transmission path; a switching receiving unit arranged at the downstream of the transmission failure monitoring unit capable of receiving a packet from the main transmission path during a normal mode, and switching to the auxiliary transmission path to acquire a packet from the auxiliary transmission path in a predetermined mode; and a switching command output unit used when the monitoring result shows that a transmission failure is present, for outputting a switching command capable of switching to the auxiliary transmission path before the transmission failure reaches the switching/receiving unit, to the switching/receiving unit.03-12-2009
20090067322FORWARDING DATA IN A DATA COMMUNICATIONS NETWORK - In an embodiment, an apparatus for forwarding data in a data communications network having as components nodes and links therebetween comprises a network interface configured to couple to a data communications network having as components nodes and links therebetween; first logic which when executed is operable to receive a repair address; second logic which when executed is operable to compute a repair path from a repairing node to the repair address around a failure component on a primary forwarding path between the apparatus and a repairing node; and third logic which when executed is operable to propagate the repair address along a label switched path (LSP), comprising the repair path, to the repairing node. The apparatus offers improved efficiency in computing a repair path in a network around a failed component because unnecessary computations are not performed with the disclosed apparatus and approach.03-12-2009
20110019539RELAY DEVICE, NETWORK SYSTEM, ROUTE SWITCHING METHOD, AND RECORDING MEDIUM - When a failure occurs in a link or another relay device, a route control unit updates a routing table stored in a current routing table. Upon update, it acquires inhibit target route information indicating a route likely to cause a micro-loop in the updated routing table and registers it into an inhibit target table. If route update in an adjacent relay device is completed, an inhibit control unit deletes a route in which the adjacent relay device is set as a next transfer destination from the inhibit target table. A transfer processing unit determines a transfer route of a packet based on the current routing table and, if the determined transfer route is not registered in the inhibit target table, executes transfer of the packet. A micro-loop can be thereby reliably avoided when route switching in a network system where communication between plural networks is relayed by plural relay devices.01-27-2011
20110019538FAILURE RECOVERY METHOD IN NON REVERTIVE MODE OF ETHERNET RING NETWORK - Provided is a failure recovery method in a non-revertive mode of an Ethernet ring network. In an Ethernet ring network, link priorities between nodes or node priorities are determined based on media access control (MAC) addresses and the nodes having blocked ports are determined after failures are recovered from based on the priorities so that the blocked ports can be distributed.01-27-2011
20100177632SYSTEM AND A METHOD FOR ROUTING DATA TRAFFIC - A communication system and a method for routing data traffic from and to a backbone network where a first Provider Edge device (07-15-2010
20090028044MULTPLE MULTICAST FORWARDER PREVENTION DURING NSF RECOVERY OF CONTROL FAILURES IN A ROUTER - In one embodiment, a multicast router initiates non-stop forwarding (NSF) recovery. In the NDF recovery, data traffic forwarding operations continue throughout a data plane of the multicast router in the presence of a failure in a control plane of the multicast router. When the multicast router receives incoming multicast packets on an interface during the NSF recovery, it compares the incoming multicast packets with entries of a multicast forwarding table of the data plane of the multicast router. In response to the comparison, the multicast router prevents multiple multicast forwarders from forwarding multicast packets for a route over a link coupled to the interface during the NSF recovery.01-29-2009
20110116366SYSTEMS AND METHODS FOR AUTOMATICALLY BUILDING AND REPAIRING A SPANNING TREE FLOODING BACKBONE IN LINK STATE ROUTED NETWORKS - The present disclosure provides systems and methods for a spanning tree topology used as a spanning tree flooding topology for messages on a link state routed network. Specifically, messages are only broadcast on the links in the spanning tree flooding topology thereby significantly reducing message flooding. The present disclosure also provides systems and methods for automatically, correctly, and efficiently creating, reconfiguring, and fixing the spanning tree topology in the event of any spanning tree link failures.05-19-2011
20110019537METHOD OF ROUTING A DATA PACKET VIA A ROUTER IN A PACKET COMMUNICATIONS NETWORK SUPPORTED BY A TRANSPORT NETWORK - The invention relates to a method of routing a data packet via a router (01-27-2011
20110242970METHODS AND APPARATUS TO FACILITATE RELAY STARTUP AND RADIO LINK FAILURE (RLF) HANDLING - Certain aspects of the present disclosure provide techniques and apparatus for startup and recovery of a radio link between a relay node and a donor base station. According to certain aspects, a relay node may perform a random access procedure utilizing a random access channel (RACH) to transition between Uu interface operations and Un interface operations. According to certain aspects, the relay node may perform radio link failure (RLF) recovery utilizing RACH procedures for a Un interface. The procedures described herein, according to certain aspects, may utilize a dedicated relay RACH resource and a Relay Physical Downlink Control Channel (R-PDCCH).10-06-2011
20110242969METHOD AND APPARATUS TO FACILITATE SUPPORT FOR MULTI-RADIO COEXISTENCE - A user equipment (UE) monitors coexistence issues of one or more associated communication resources. The UE initiates link recovery procedures (e.g., declaring a Radio Link Failure (RLF)) in response to the monitoring when a coexistence issue is detected. The UE can also access a new channel or a new Radio Access Technology (RAT) in response to initiating the link recovery. The network may have the ability to control whether the UE can initiate the link recovery.10-06-2011
20090323519MOBILE AD-HOC NETWORK (MANET) AND METHOD FOR IMPLEMENTING MULTIPLE PATHS FOR FAULT TOLERANCE - A mobile ad-hoc network (MANET) communicates between a source node and destination node and includes a plurality of intermediate nodes. A main communication path is established between the source node through intermediate nodes to the destination node based on an underlying routing protocol. Alternative communication paths are established among neighboring nodes as standby nodes that are positioned an “n” hop distance from nodes of the main communication paths to form a tube of multiple communication paths from the source node to the destination node. The main communication path reconfigured within the tube of multiple communication paths to an alternative communication path using at least one standby node when the main communication path is broken.12-31-2009
20090073874RING-SHAPED REDUNDANT COMMUNICATION PATH CONTROL METHOD - In a ring redundant communication path control method, each of transfer apparatuses periodically transmits an inspection frame for inspecting a communication path, detects a failure of the communication path when the inspection frame is not received for a fixed time, transmits a non-arrival notification frame for notifying that the inspection frame has not arrived yet, and detects a failure of the communication path when the non-arrival notification frame is received. Each of the transfer apparatuses closes, when a failure is detection, a port in which the failure is detected, transmits an open command frame for commanding to open a normally closed port from the other port other than the closed port, transfers an open command frame when the open command frame is received, and opens the normally closed port when the other port other than the closed port in which the failure is detected, the port in which the open command frame is detected, or the other port configuring a ring redundant communication path same as that of the port is the normally closed port.03-19-2009
20100014418Connection recovery device, method and computer-readable medium storing therein processing program - A connection information takeover unit in an active communication processing apparatus in the system sends connection information and a transmission sequence number of each data to be transmitted to a standby connection recovery device when a connection is established, and a connection information takeover unit in a standby communication processing apparatus retains the connection information and the latest transmission sequence number in a connection information storing unit. A dummy data sending unit of the communication processing apparatus which is switched to active because a failover occurred sends dummy data to a client, and if a transmission sequence number of a reply packet for the dummy data matches with the transmission sequence number in the connection information storing unit, a connection continuity determining unit notifies a communication processing unit that connection can be continued.01-21-2010
20100014419APPARATUS AND METHOD FOR IMPROVING TRANSPORT CONTROL PROTOCOL PERFORMANCE USING PATH RECOVERY NOTIFICATION OVER WIRELESS NETWORK - Provided are an apparatus and method for improving transmission control protocol (TCP) performance using path recovery notification over a wireless network. The apparatus includes: a path recovery manager which detects a mobile host recovered from a temporary disconnection state and then outputs a detection signal to notify the detection result; a path recovery notification manager which receives the detection signal and generates an ACK (acknowledgement) packet to inform a transmitting end that the mobile host is recovered; and a first packet transceiver which transmits/receives the generated ACK packet and a data packet. Accordingly, a temporary disconnection state of a wireless network is explicitly informed to a transmitting end so as to transmit only lost packets without performing unnecessary congestion control, thereby improving TCP performance.01-21-2010
20100054122METHODS AND SYSTEMS FOR AUTOMATICALLY REROUTING LOGICAL CIRCUIT DATA - Methods and systems are provided to automatically reroute logical circuit data. In accordance with an example method, a failure of a dedicated logical circuit in a packet-based network is identified. The dedicated logical circuit has a first logical circuit identifier assigned prior to identifying the failure. The dedicated logical circuit connects a host device to a remote device to communicate data that originates and terminates only at the host device and the remote device. A logical failover circuit comprising an alternate communication path for communicating the data is selected. When the first logical circuit identifier of the dedicated logical circuit does not match a second logical circuit identifier of the logical failover circuit, the second logical circuit identifier is renamed to match the first logical circuit identifier. The data is rerouted to the logical failover circuit without manual intervention.03-04-2010
20090147675RING SWITCHOVER METHOD - A fast ring switchover is enabled in packet level processing at the time of ring configuration, and as a result, a system switchover function can be implemented in an Ethernet switch or the like by a ring switchover method in a network constituted of layer 2 switches connected in a ring shape, each layer 2 switch having a path control function and a failure detection function. The ring switchover method includes the steps of providing in each layer 2 switch an address learning table in which a Media Access Control (MAC) address and a corresponding port are stored; on detection of a link failure between mutually neighboring layer 2 switches, transmitting a failure notification frame packet from each neighboring layer 2 switch; and in the layer 2 switch having received the failure notification frame, recording a Media Access Control (MAC) address of said layer 2 switch into the failure notification frame, and transferring the failure notification frame to a neighboring layer 2 switch.06-11-2009
20100238796Transparent failover support through pragmatically truncated progress engine and reversed complementary connection establishment in multifabric MPI implementation - A method, system, and computer program product containing instructions for establishing and maintaining multiple connections over different communication fabrics between two processes. The slowest, most reliable connection may be established first and then complemented by progressively faster connections between the same pair of processes. Each of these multiple connections is maintained throughout the duration of the communication session between the processes. These multiple connections may include connections made via network interfaces and, when available, direct connections such as a shared memory connection or a point-to-point processor interconnection. This connection strategy provides one or more failback communication paths that can be used with no startup costs in the event of failure of one of the other communication paths. These failback communication paths can be used to exchange failover protocol information needed to resend messages that were undelivered due to failure of one of the communication connections.09-23-2010
20110080826METHOD OF FAULT TOLERANCE AND SYNCHRONOUS FAILOVER FOR BROADCAST VIDEO ACROSS THE NETWORK - A system and a method are disclosed for detecting a multicast stream fault condition at a variety of points within a digital broadcast video distribution system. In addition, a method of seamless switchover from a primary to a redundant multicast stream is provided.04-07-2011
20110176413MOBILE COMMUNICATION METHOD, NETWORK DEVICE, AND EXCHANGE - Provided is a mobile communication method which includes: a step in which a first exchange station MME#a allocates a temporary identifier TMSI for identifying a mobile station UE#07-21-2011
20100128602METHOD AND APPARATUS FOR PERSISTENT CONNECTIONS TO A DEVICE THROUGH THE USE OF MULTIPLE PHYSICAL NETWORK CONNECTIONS AND CONNECTION HAND-OFFS BETWEEN MULTIPLE BANDS, MODES AND NETWORKS - Embodiments communicate messages between mobile devices and destination devices. An exemplary embodiment includes a first border server operable to establish a first communication connection to the mobile device over a first network operating under a first protocol, a second border server operable to establish a second communication connection to the mobile device over a second network operating under a second protocol, and a transport management server communicatively coupled to the first border server and the second border server, and operable to establish a third communication connection to the destination device over a third network operating under a third protocol. The first protocol is configured to communicate a first encapsulated portion of the message. The second protocol is configured to communicate a second encapsulated portion of the message. The third protocol is configured to communicate the first encapsulated portion of the message and the second encapsulated portion of the message.05-27-2010
20110080827SHARED RISK GROUP HANDLING WITHIN A MEDIA GATEWAY - A media gateway controller (MGC) is described herein that implements a shared risk group package to control and prevent a media gateway (MG) from establishing redundant links like a primary link and a secondary link that use resources that share the same risk of failure. Essentially, the MGC uses the shared risk group package to control which resources like ephemeral terminations are used by the MG to establish the primary link and the secondary link such that if any of the resources associated with the primary link fail then the secondary link remains operational within the MG and if any of the resources associated with the secondary link fail then the primary link remains operational within the MG.04-07-2011
20110069611WIRELESS SENSOR NETWORK - Provided is a wireless sensor network including: a plurality of sensor nodes connected linearly; a sink node connected to the uppermost node among the sensor nodes; a control server; a gateway connected between the sink node and the control server to transmit and receive data; and a plurality of relay gateways. In the case where the plurality of the sensor nodes are divided into a predetermined number of subgroups, the sensor nodes located at the highest levels in the divided subgroups and which are connected to the relay gateways are designated as relay nodes. In the case where an amount of data stored in the relay node exceeds a predetermined threshold value, the relay node transmits the stored data through the connected relay gateway to the control server. Accordingly, in the case where the data of the sensor nodes are increased, it is possible to minimize a problem in that the increased data are lost during transmission.03-24-2011
20110069612BEST PATH SELECTING DEVICE, BEST PATH SELECTING METHOD, AND PROGRAM - A best path selecting device in a bus master (03-24-2011
20120201128APPARATUS AND METHOD FOR TRANSFERRING A PACKET - A packet transferring apparatus and method that may be applied to all packet systems operated on a packet transport network, to ensure the same level of reliability and availability as a circuit network. A path providing unit may acquire packet transfer path information regarding a packet transfer path from a transport network, and a subscriber interface unit may generate transport packet data by adding the packet transfer path information to packet data received from a subscriber network and may output the transport packet data. A packet switch may switch the transport packet data inputted from the subscriber interface unit, and a network interface unit may transmit the transport packet data switched by the packet switch, to the transport network along the packet transfer path.08-09-2012
20120201127Redundant Pseudowires Between Ethernet Access Domains - A computer network includes first and second Ethernet access domain networks, each of Ethernet access domain networks including a user-facing provider edge (u-PE) device, and a stack group of network-facing provider edge (n-PE) devices coupled with the u-PE device, the n-PE devices running a bidding protocol to select one of the n-PE devices as a primary n-PE device for a single pseudowire connection path between the first and second Ethernet access domain networks. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).08-09-2012
20100302937 Control Method, System, and Device for Circuit Domain Fallback - The present invention discloses a method, system, and apparatus for controlling Circuit Switched, CS, fallback. The method comprises: a network element which got calling information of the present call in CS domain notifying a Mobility Management Entity, MME, of the calling information; the MME notifying the called User Equipment, UE, of the calling information; the called UE determining whether the call performs CS fallback according to whether the user answers the call or according to pre-configured CS fallback policy. By applying the present invention, the CS fallback of ongoing call can be controlled by the called user which is in EPS network, therefore the usability of the user's EPS network service is ensured, the satisfaction degree of the user is improved, and the useless occupancy of the GSM/UMTS network resources is reduced.12-02-2010
20120033547Method and System for Implementing Network Element-Level Redundancy - According to an additional embodiment, a method may include communicatively coupling a first network element to a second network element via a first path of a first point-to-point network. The method may also include communicatively coupling the first network element to a third network element via a second path of the first-point-to-point network. The method may additionally include communicatively coupling the second network element to a fourth network element via a first path of a second point-to-point network. The method may further include communicatively coupling the third network element to the fourth network element via a second path of the second point-to-point network. The method may also include configuring the first path and the second path of the first point-to-point network as paths of a first linear protected switching connection and the first path and the second path of the second point-to-point network as paths of a second linear protected switching connection such that traffic associated with a service and communicated between the first network element and the fourth network element via the first path of the first point-to-point network and the first path of the second point-to-point network may be switched over to the second path of the first point-to-point network and the second path of the second point-to-point network in response to an event.02-09-2012
20120170449TECHNIQUE FOR PROTECTING COMMUNICATION TRAFFIC IN A CONNECTION HAVING REDUNDANCY - A technique for protecting traffic in a Layer 2 (L2) communication network between a first and a second local nodes (CE07-05-2012
20120243405SYSTEMS AND METHODS FOR SCALING PERFORMANCE OF ETHERNET RING PROTECTION PROTOCOL - The present disclosure provides systems and methods for scaling performance of Ethernet Ring Protection Protocol. Specifically, the systems and methods may apply to G.8032 and may provide protection switching control plane performance scaling benefits. In an exemplary embodiment, the present invention summarizes the per “virtual” ring control plane protocol into a single logical ring control plane protocol. Advantageously, the present invention transforms the G.8032 protocol from a per-virtual ring protocol to a per-logical ring control protocol. The mechanism/methodology that is used is to include minimal per-virtual ring instance information in to the Ring Automated Protection Switching (R-APS) (control) frames. Additionally, the present invention cleanly decouples the placement of the R-APS (control) channel block location on the ring from that of the virtual channel data blocks. Current G.8032 specifications tightly couple the location of each R-APS (control) channel block and the virtual channel block that it is managing.09-27-2012
20120063301METHOD FOR TRANSMITTING REAL-TIME DATA PACKETS IN CONVERGENT NETWORKS - The invention relates to a method and a system for transmitting data packets between a terminal (03-15-2012
20100284270METHOD, SYSTEM, AND DEVICE FOR FORWARDING DATA FRAMES - The present disclosure discloses a method, system, and device for forwarding data frames, and relates to the communication field. The method includes the following steps: An upstream near-end device in a faulty part of a working tunnel activates a segmental protection tunnel after receiving a data frame when a part of the working tunnel fails, where the start node of the segmental protection tunnel is the upstream near-end device and the end node of the segmental protection tunnel is a downstream near-end device in the faulty part; the upstream near-end device forwards the data frame to the downstream near-end device through the segmental protection tunnel; and the data frame at the downstream near-end device is forwarded to the destination device through the faultless part of the working tunnel. The present disclosure provides segmental protection for the PBB TE tunnel.11-11-2010
20100329112ETHERNET DEVICE AND LANE OPERATING METHOD - An Ethernet device having multiple lanes and a method of operating the lanes are provided. In one general aspect, it is possible to allocate a dummy block to each of one or more lanes such that the lanes do not selectively participate in communications. In addition, on a receiving side, the dummy block can be removed from among the genuine data blocks to enable data to be decoded. In this case, an Ethernet device on a transmission side and an Ethernet device on a receiving side can exchange information of a lane to which the dummy block is allocated by use of a lane status message, and the lane status message may be based on a link fault message specified by Ethernet standards.12-30-2010
20110261683COMMUNICATIONS SYSTEM, CARRIER-SIDE COMMUNICATION APPARATUS, BASE STATION APPARATUS, AND COMMUNICATION METHOD THEREFOR - In a communications system, a first upper node performs communication through a first communication session, and a second upper node performs communication through a second communication session. An upper communication control unit controls those upper nodes. A first communication unit communicates with the first upper node through the first communication session established therewith. A second communication unit communicates with the second upper node through the second communication session established therewith. A communication control unit controls those communication units. The communication control unit and the upper communication control unit perform communication path switching so as to use the second communication session to transport a signal intended for the first communication session, when the first communication sessions is disrupted, or when the number of existing first communication sessions has reached an upper limit that the first upper node can handle.10-27-2011
20110261684METHOD AND APPARATUS OF CONNECTIVITY RECOVERY IN A WIRELESS NETWORK - A wireless communication device and a method of operating an antenna training process to discover first and second communication paths between at least two stations, to rank according to a quality criterion transmitting and receiving modes of an antenna, to report best transmitting mode and best receiving mode for transmitting and receiving signals over said first and second communication paths and to establish a communication link on a selected communication path based on the quality of the transmitting mode and said receiving mode.10-27-2011
20080219154METHOD OF SENDING DATA PACKETS FROM A SERVER TO CLIENTS VIA A DATA LINK THAT HAS A GIVEN ERROR RATE - The present invention relates to a method of sending data packets from a server to clients via a first data link that has a given error rate. The clients are interconnected by a second data link that has a lower error rate than that of the first link. The server sends all the packets to all the clients over the first link, regardless of the client that is the recipient of each of the packets. A client that detects that it has not received a packet of which it is the recipient over the first link requests the other clients to send said packet to it over the second link. The Invention is particularly applicable for video-on-demand.09-11-2008
20110096660HANDOVER PROCESSING METHOD, AND MOBILE TERMINAL USED IN THE METHOD - Disclosed is a technique to provide a handover processing method to avoid a failure in both of the handovers and enables communication via an access network as a UE initiated handover target that is originally optimal. The handover processing method includes: a step where a mobile terminal (04-28-2011
20100165836Technique for Handling Radio Link Failure in a Communication Network - A technique for handling radio link failure in a communication network (07-01-2010
20100182902CONNECTIVITY FAULT MANAGEMENT IN A PROVIDER BACKBONE BRIDGE TRAFFIC ENGINEERING (PBB-TE) DOMAIN - A system and method for providing Connectivity Fault Management (CFM) in a Provider Backbone Bridge Traffic Engineering (PBB-TE) telecommunication network utilizing Ethernet-based packet transport. PBB-TE point-to-point and point-to-multipoint services are identified, and PBB-TE maintenance points associated with the identified PBB-TE services are addressed. The addressed PBB-TE maintenance points are modified by adding a PBB-TE Service Demultiplexer to each PBB-TE maintenance point for identifying independent PBB-TE service instances. Basic CFM protocols are enhanced to duplicate the behavior of CFM protocols on virtual local area network (VLAN)-based maintenance associations. The PBB-TE maintenance points may be Maintenance association End Points (MEPs) and Maintenance association Intermediate Points (MIPs).07-22-2010
20110261682APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DYNAMIC LANE INFORMATION IN MULTI-LANE BASED ETHERNET - Provided is an apparatus and method of transmitting and receiving dynamic lane information that may generate and transmit a lane status information frame containing lane information for exchanging of lane information and variable lane adjustment, in order to dynamically operate a number of lanes in multi-lane based Ethernet.10-27-2011
20110134750CROSSOVER OPERATION IN A 1+1 PROTECTION SWITCHING ENVIRONMENT - A communication system that comprises at least two links to carry signals, a first communication unit and a second communication unit. The first communication unit comprises at least two ports, each port configured to transmit and receive signals; and a logic unit configured to process the signals transmitted and received by each of the at least two ports in the first communication unit. The second communication unit comprises at least two ports, each port configured to transmit and receive signals and coupled to a respective one of the at least two ports in the first communication unit via a respective one of the at least two links; a programmable logic unit configured to process the signals transmitted and received by each of the at least two ports in the second communication unit; and a processor. The processor is configured to detect a crossover connection between one of the at least two ports in the second communication unit and the respective one of the at least two ports in the first communication unit based on an analysis of a pair identifier field in a message received at the second communication unit, wherein the pair identifier field is separate from the address field of the received message.06-09-2011
20090175166METHOD, APPARATUS AND SYSTEM FOR RING PROTECTION - A method, apparatus and system for Ethernet Ring Protection (ERP) are disclosed. The system includes: a node which detects a link fault blocks the port connected with the faulty link after the link on the ring is faulty, and sends a fault alarm message to adjacent nodes; and the adjacent nodes judge whether the state of the node changes from the normal state to the faulty state according to the received fault alarm message, and clear the forwarding table of the node if such is the case.07-09-2009
20110051599Radio Communication System, Base Station Device, Radio Communication Terminal, and Radio Communication Method - A wireless communication system which performs packet communication in a time division multiplexing communication format between wireless communication devices using either one or a plurality of communication channels includes: a resend request unit which detects that a received packet contains an error and requests a resend; a resend request detection unit which detects the request for a resend; a packet resend unit which resends the packet in accordance with the request for a resend detected by the resend request detection unit; and a channel allocation unit which allocates a different communication channel for the packet resend unit to resend the packet from the communication channel which was used for sending the packet in which the error detected by the resend request unit was contained.03-03-2011
20100027415METHOD AND SYSTEM FOR PROVIDING FAULT DETECTION AND NOTIFICATION FOR COMPOSITE TRANSPORT GROUPS - An approach is provided for fault detection and notification for a composite transport group (CTG). A component link of a CTG associated with a label switched path (LSP) is monitored. A fault is detected in the component link. It is determined whether traffic of the LSP can be transparently rerouted to another component link of the CTG based on resource availability of the other component link. The traffic is transparently rerouted to the other component link if resources are available. An upstream label switched node is notified if resources are unavailable.02-04-2010
20100027416Voice over IP system recovery apparatus for service and packet groups based on failure detection thresholds - A system comprising a SIP failure tracker, wherein the SIP failure tracker monitors SIP failures and issues an alert if a SIP failure threshold is exceeded.02-04-2010
20100020680MULTI-CHASSIS ETHERNET LINK AGGREGATION - In one embodiment a method is provided for forwarding traffic through a standby device in the event of an uplink connection failure. The method generally includes forwarding traffic received on a first downlink connection with a dual-homed device to an uplink connection with a network core, detecting a failure on the uplink connection with the network core, and in response to detecting the failure, notifying a standby device of the failure and sending a message to the dual-homed device to trigger the dual-homed device to begin forwarding traffic to the network core via a second downlink connection between the standby device and the dual-homed device.01-28-2010
20110216647TELEPHONE SYSTEM, GATEWAY FOR TELEPHONE SYSTEM, AND REDUNDANCY SWITCHING METHOD - According to one embodiment of the invention, there is provided a telephone system comprises gateways used to convert each other's protocols of IP network and PSTN. One of the gateways selectively serves as a main gateway, and the other gateways serve as slave gateways controlled by main gateway. Each of gateways includes a control channel manager, an operation controller and a determination module. Control channel manager of the main gateway controls speech data individually sent and received by gateways, based on a control signal of a control channel of PSTN. Operation controller controls redundancy switching between the plurality of gateways upon occurrence of a fault. Determination module determines whether the fault is associated with control channel. When the fault is associated with control channel, determination module notifies a slave gateway of message used to activate control channel manager of the slave gateway via IP network.09-08-2011
20120147741Method and system for ethernet path protection switching - A switching method for Ethernet path protection is provided in the disclosure. The method includes: setting a group of Traffic Engineering Service Instances (TESIs) protected by a protection group; detecting statuses of a working entity and a protection entity; implementing the path protection switching according to an outbound port configured for Ethernet Switching Path (ESP) of the TESI at the endpoint of the protection group and in conjunction with a corresponding protection switching mechanism selected in current status detection. A switching system for Ethernet path protection is also provided in the disclosure, wherein a switching unit is configured to implement the path protection switching according to the outbound port configured for the ESP of the TESI at the endpoint of the protection group and in conjunction with the corresponding protection switching mechanism selected in current status detection. The method and system of the disclosure can enhance the speed of fault recovery, reduce nodes for the protection switching, be beneficial to network optimization, and ensure the reliability of end-to-end traffic.06-14-2012
20120147742APPARATUS AND METHOD FOR PACKET FORWARDING - A method for packet forwarding, including receiving packets; extracting a test packet containing information indicating a path to be verified from the received packets; and forwarding the test packet to the path to be verified, rather than to a first path to which the received packets are forwarded, based on the information indicating the path to be verified contained in the test packet.06-14-2012
20090231995TUNNELED DIRECT LINK SETUP COLLISION RESOLUTION IN A WIRELESS LOCAL AREA NETWORK - Collisions between tunneled direct link setup (“TDLS”) requests are resolved by associating each request with a priority value. Upon issuing a TDLS request the encapsulated frame is associated with a priority value. When a station, which is waiting for a response from a recently issued TDLS request, receives a TDLS request from another station, a collision occurs. The collision is resolved by comparing the priority value associated with the TDLS request initiated by the station and the TDLS request received. The TDLS request with the higher priority value is pursued while the TDLS request with the lower priority value is ignored. The priority value can be based on the sending station's MAC address or other value which can differentiate the TDLS requests.09-17-2009
20100182903METHOD AND APPARATUS FOR TRANSMITTING OVERLOAD INDICATOR OVER THE AIR - Techniques for transmitting overload indicators over the air to UEs in neighbor cells are described. In one design, an overload indicator may be transmitted as a phase difference between at least one synchronization signal and a reference signal for a cell. In another design, an overload indicator may be transmitted as a phase difference between consecutive transmissions of at least one synchronization signal for a cell. In yet another design, an overload indicator may be transmitted by a cell on resources reserved for transmitting the overload indicator. In yet another design, an overload indicator may be transmitted by a cell on a low reuse channel or a broadcast channel. For all designs, a UE may receive overload indicators from neighbor cells, determine the loading of each neighbor cell based on the overload indicator for that cell, and control its operation based on the loading of the neighbor cells.07-22-2010
20120307627COMMUNICATION CONTROL METHOD AND MANAGEMENT APPARATUS - In a communication control method: information processing apparatuses output frames to a first communication apparatus for communication; when a failure in a link between the first communication apparatus and a first one of the information processing apparatuses is detected, the first one of the information processing apparatuses switches the forwarding direction of frames containing tag information from a direction toward the first communication apparatus to a direction toward a second communication apparatus; the management apparatus searches for a second one of the information processing apparatuses which uses the tag information in common with the first one of the information processing apparatuses; and the second one of the plurality of information processing apparatus switches the forwarding direction of frames containing the tag information used in common with the first one of the information processing apparatuses, from a direction toward the first communication apparatus to a direction toward the second communication apparatus.12-06-2012
20120307626FIELD-DEPLOYABLE PROTOCOL MESSAGE INTERCEPTOR - A method and apparatus is disclosed for a field-deployable protocol message interceptor for insertion between network elements, to autonomously intercept success path protocol messages from a first network element and substitute corresponding failure path messages for transmission to a second network element, to simulate the introduction of unexpected protocol messages into the protocol message flow from the first network element to the second network. Subsequent to intercepting messages, the test protocol processor may perform one or more of several actions according to the results of statistical calculations. These actions include allowing the message to drop, replacing the message after a delay, replacing the message after altering the payload of the message, and replacing the message after altering the message type. The disclosed field-deployable protocol message interceptor is particularly useful for providing a means to perform in situ field testing of network performance indicators under desired statistical conditions.12-06-2012
20120039167SYSTEM, APPARATUS, AND METHOD FOR IMPROVING REDIAL PERFORMANCE IN WIRELESS COMMUNICATION SYSTEMS - In accordance with aspects of the disclosure, a method, apparatus, and computer program product are provided for wireless communication. The method, apparatus, and computer program product may be configured to acquire a first wireless network for data packet communication on a first radio access technology, request service for a voice call from a second radio access technology via a data tunnel provided by the first radio access technology, determine a failure in obtaining the requested service for the voice call, attempt to re-acquire the first radio access technology and redial the voice call via the first radio access technology in response to determining the failure, obtain the requested service for the voice call if performing of the attempt was less than or equal to a threshold, and acquire a second wireless network via the second radio access technology if performing of the attempt was greater than the threshold.02-16-2012
20100165835METHOD AND APPARATUS FOR SYNCHRONIZATION DURING A HANDOVER FAILURE IN A WIRELESS COMMUNICATION SYSTEM - Systems and methodologies are described herein that facilitate synchronization of Node B-ordered parameters, such as discontinuous transmission (DTX)/discontinuous reception (DRX) status, following a handover failure and/or other suitable triggering events. As described herein, upon failure of a handover from a source Node B to a target Node B, a mobile device can return to the source Node B and synchronize with the source Node B with respect to DTX/DRX status and/or other Node B-ordered parameters. DTX/DRX synchronization can be performed by setting DTX/DRX status to a default state, a last DTX/DRX state utilized prior to initiation of the failed handover, or the like. Identification of the last DTX/DRX state can be conducted as described herein according to an analysis of respective orders communicated by the source Node B in relation to respective time intervals following initiation of the failed handover.07-01-2010
20110063972Duplicate traffic avoidance in a point to multi-point network - Provided is a method for avoiding traffic duplication in a point to multi-point network, the method including monitoring a status of first interconnection links in a first data path from a source to a destination, the first data path including an ingress node, an egress node, and one or more intermediate nodes. The method further includes establishing a second data path if a link of the first interconnecting links is determined to be an inoperable link, the second data path including the ingress node, the egress node, at least one of the one or more intermediate nodes and second interconnecting links, the second interconnecting links including new interconnecting links and a subset of the first interconnecting links, the subset not including the inoperable link in the first interconnecting links.03-17-2011
20110317549Method to be Run in and Device of a Network as well as Communication System Comprising Such Device - A method and a device are provided to be run in a network (or in particular on a network component of such network). The network has several network elements that are connected via a ring. One network element is a ring master with a primary port and a secondary port. The novel process includes the steps of (i) a failure along one direction of the ring is detected by the ring master; and (ii) the ring master sends a first message via its port that indicates the direction of the failure.12-29-2011
20110317550RADIO BASE STATION, RADIO EQUIPMENT CONTROL AND RADIO EQUIPMENT - A radio base station wherein, when a radio equipment control detects an uplink communication failure on a physical circuit, a downlink communication processing unit is configured to transmit a downlink IQ data for all combinations of antennae and carriers to a radio equipment with all values of the downlink IQ data set to “0,” and a downlink radio equipment is configured to stop a transmission of a downlink signal of all the carriers through all the antenna when the downlink IQ data whose values are all “0” is received.12-29-2011
20110158085ROUTING AND TOPOLOGY MANAGEMENT - A method for routing communications on a network node in a communications network includes: updating a central domain master regarding changes detected in topology, receiving a routing plan from the central domain master, where the routing plan is calculated at least in accordance with the changes, and transmitting data as necessary in accordance with the routing plan. A method implementable on a central domain master for routing communications between network nodes in a communications network includes receiving transmissions regarding changes detected in topology from the network nodes, calculating a routing plan based on at least the transmissions, and distributing the routing plan to the network nodes, where the central domain server is one of the network nodes.06-30-2011
20110158084Retry for Telematics Packet Data Connection Failures in CDMA 1xRTT Network - A technique and system are provided for executing retry procedures to resolve a packet connection failure during a CDMA 1xRTT packet session. In particular, the DTE is configured and controlled to retry based on either failure signals from the NAD or the Application Service Timer. Moreover, in one aspect, the DIE is configured and controlled to retry the packet connection selectively for traffic channel assignment failure, PPP connection failure, TCP/IP connection failure and Application service failure. In this way, the end user will experience a shorter service delivery time for packet-based telematics services.06-30-2011
20110158083Determining Connectivity in a Failed Network - The disclosed technology, in one embodiment, involves a method that improves the execution speed of graph algorithms that are commonly used by network service providers for network analysis and/or design. The disclosed technology can be use to provide significant efficiency improvements when applied to networks that are separated into several isolated fragments (“fragmented networks”) due to severe damage that may be caused by either natural disaster (such as hurricanes or earthquakes), or planned adversary attacks. In one embodiment of the disclosed technology, a graph algorithm, that is used to determine a characteristic of the network, is not applied directly to the whole network/graph. Instead, the graph algorithm is applied to isolated network/graph fragments that are identified, for example, by using a fragment discovery algorithm. The graph algorithm is then applied to one or more relevant fragments. The results may be combined to obtain a network wide result.06-30-2011
20120044804DYNAMIC REROUTING OF DATA PATHS IN A WIRELESS COMMUNICATION NETWORK - A system and methodology that dynamically reroutes active communications sessions between a user equipment (UE) and a wireless network. In particular, the system can determine a current or impending fault condition and reroute a data path for network traffic to another service. Moreover, the system can identify a failed element in a wireless network and deny access and divert traffic until the element is restored. Further, the system can issue an alert to a user interface of the wireless network with information associated with a fault condition, a failed element, or a restored element.02-23-2012
20090201805FORWARD ERROR CORRECTION BASED DATA RECOVERY WITH PATH DIVERSITY - A media source sends media packets over a first media path. Repair packets are encoded from the media source packets and sent over a second different media path. Sending the source packets and repair packet over different media paths is referred to as Forward Error Correction (FEC) spatial diversity and reduces the amount of repair packet overhead required for repairing the media source packets in case of a network outage or packet loss. To provide load balancing, a first set of media streams may be sent over the first media path and a second set of media streams may be sent over the second media path. If a fault is detected on one of the media paths, then the repair packets may no longer be transmitted and the one or more media streams from the disabled media path are transmitted over the working media path.08-13-2009
20120008493Bi-Directional Ring Network Having Minimum Spare Bandwidth Allocation and Corresponding Connection Admission Controls - The present invention provides for a method for reserving spare bandwidth for a link in a communication network including a plurality of links. The method provides for monitoring the volume of traffic routed through each link of the communication network. A single link failure for each link is then simulated and the volume of traffic which would be rerouted through each link for maintaining communication and the volume of traffic removed from each link are determined for each simulated single link failure. The difference between the volume of traffic which would need to be rerouted through each link and the corresponding volume of traffic removed from each link is then computed, and a maximum difference value is determined for each link for all simulated single link failures. An amount of spare bandwidth equivalent to the determined maximum difference is then reserved for each link.01-12-2012
20120207016BACKHAUL FABRIC FOR WIRELESS NETWORK - A managed surface-space network fabric is presented. The surface-space network fabric can include a spaced-based network fabric and a surface-based network fabric integrated together to form a single fabric managed by a global fabric manager. The global fabric manager cooperates with other fabric managers local to each fabric to establish a communication topology among all the nodes of the fabric. Preferred topologies include paths from any port on a node to any other port on another node in the fabric. The surface-space fabric, and each individual fabric, can function as a distributed core fabric operating as a single, coherent device.08-16-2012
20120026865FEMTOCELL SERVICE THROUGH A SECONDARY CONNECTION - System(s), apparatus(es), and method(s) are provided to for providing femtocell service through a secondary connection to a network gateway node that is part of a service provider network. The secondary connection can be established in response to at least one telecommunication performance condition of a primary connection to the network gateway node; the at least one performance condition includes connectivity state of the primary connection or quality of traffic delivery through the primary connection. The secondary connection can be established, in part, via a home gateway node that is alternative to a home gateway node associated with a femtocell access point (AP) that enables, in part, the femtocell wireless service. The main home gateway node or the femtocell AP can initiate establishment of the secondary connection. Home gateway node(s) or femtocell AP(s) that can provide femtocell service through the secondary connection can manage connectivity with the network gateway node.02-02-2012
20120026866METHOD AND APPARATUS FOR RAPID SWITCHOVER FROM PRIMARY TO STANDBY MULTICAST TREES - A capability is provided for switching between primary and standby multicast trees on a network egress node of a multicast network. The network egress node includes a first MPLS LABEL Record including a first tree identifier of the first multicast tree, a second MPLS LABEL Record including a second tree identifier of the second multicast tree, and a MULTICAST Record including a plurality of primary tree identifiers and a plurality of standby tree identifiers. The MPLS LABEL Records include parameters, respectively, where the values of the parameters are indicative of respective packet processing rules to be applied for determining whether to accept or discard packets. When the parameter of an MPLS LABEL Record is set to a first value, a determination as to whether to accept or discard a packet received via the associated multicast tree is performed by comparing the tree identifier of the MPLS LABEL Record only to primary tree identifiers of the MULTICAST Record. When the parameter of an MPLS LABEL Record is set to a second value, a determination as to whether to accept or discard a packet received via the associated multicast tree is performed by comparing the tree identifier of the MPLS LABEL Record to primary tree identifiers of the MULTICAST Record or standby tree identifiers of the MULTICAST Record.02-02-2012
20120155252Method of operating a mobile router - A method comprises: providing a wireless mobile router in a vehicle, the mobile router being operable to establish a communication link to a network management system; utilizing the mobile router to collect data independent of the router being coupled to the network management system; storing the data in the router; establishing a first communication link between the router and the network management system upon an occurrence of a first predetermined event; operating the router to upload the data to the network management system upon occurrence of the first predetermined event; and transmitting the data to the network management system via the first communication link.06-21-2012
20120063300METHODS AND APPARATUS FOR RELOCATING AND RESTORING CONNECTIONS THROUGH A FAILED SERVING GATEWAY AND TRAFFIC OFFLOADING - In a radio telecommunications network, a serving gateway support node controls connections between user equipment nodes and a packet-based network that pass through at least one serving gateway and at least one packet gateway. The serving gateway support node detects failure of communications to a first serving gateway. The serving gateway support node responds to the detected failure by initiating relocation of existing connections through the first serving gateway to instead pass through a second serving gateway. The serving gateway support node detects recovery of communications to the first serving gateway, and responds by ceasing relocation of at least some of the existing connections that have not yet been relocated to the second serving gateway. Related methods, serving gateways, and packet gateways are also disclosed.03-15-2012
20090135718METHOD FOR RETRANSMISSION IN MOBILE COMMUNICATION SYSTEM - Provided is a method for retransmission in a mobile communication system; and, more particularly, to an integrated operation method of Automatic Retransmission Request (ARQ) and Hybrid Automatic Retransmission Request (HARQ) in a mobile communication system. The method includes the steps of: a) shifting to a 205-28-2009
20120155251Mobile router network - A method comprises: providing a wireless mobile router in a vehicle. The mobile router is operable to establish a communication link to a network management system. The mobile router collects data independent of the router being coupled to the network management system; stores the data in the router; establishes a first communication link between the router and the network management system upon an occurrence of a first predetermined event; operates the router to upload the data to the network management system upon occurrence of the first predetermined event; and transmits the data to the network management system via the first communication link.06-21-2012
20120155250METHOD AND SYSTEM OF PROVIDING MICRO-FACILITIES FOR NETWORK RECOVERY - An approach provides micro-facilities for network recovery. An outage condition is detected, and is associated with one of a plurality of service provider facilities forming a service provider network. A router of the service provider network is determined to be capable of reaching the one service provider facility, wherein the provider router is resident within a customer facility. Bandwidth is allocated to one or more links for re-directing traffic over the provider router to the one service provider facility.06-21-2012
20120300620FAST RESTORATION FOR PROVIDER EDGE NODE AND ACCESS LINK FAILURES - A first network device creates a protection path to a second network device associated with a first service site, and creates a pseudowire between the first service site and a second service site via the first network device and the second network device. The first network device also detects a failure between the first network device and the first service site, and forwards traffic, provided by the pseudowire between the first service site and the second service site, via the protection path. The second network device uses the traffic on the protection path as a trigger to activate a link between the second network device and the first service site.11-29-2012
20110090787SPANNING TREE FLOODING BACKBONE SYSTEMS AND METHODS FOR LINK STATE ROUTED NETWORKS - The present disclosure provides systems and methods for a spanning tree topology used as a “flooding backbone” for control messages on a link state routed network. Specifically, control messages are only broadcast on the flooding backbone thereby significantly reducing message flooding. The present disclosure also provides systems and methods for correctly and efficiently reconfiguring/fixing the spanning tree topology in the event of any spanning tree link failures without re-running the spanning tree protocol.04-21-2011
20100172236METHODS AND SYSTEMS FOR MESH RESTORATION BASED ON ASSOCIATED HOP DESIGNATED TRANSIT LISTS - The present disclosure provides systems and methods for mesh restoration based on Associated Hop Designated Transit Lists (DTLs). The Associated Hop DTLs are calculated through a global restoration calculation (GRC) algorithm that can be run by a central controller in an offline manner. The restoration paths calculated by the GRC algorithm can then be pushed down to the originating nodes for each connection to utilize at the time of a given failure scenario. This GRC algorithm can be performed for each possible bundle failure in the network, where a bundle failure is determined by the set of all links which may fail together due to common shared risk, such as a common conduit or DWDM fiber. The globally calculated, contention free, restoration paths are then pushed down to each node in the network.07-08-2010
20100149967NODE REPAIR IN A MESH NETWORK - In embodiments of the present invention improved capabilities are described for sensing a change in a network topology using a discovery node in a mesh network; transmitting an explore frame, based at least in part on the sensed change, from the discovery node to a destination node using an intermediate node; receiving a response to the explore frame from the destination node; determining at least one functional network route from the discovery node to the destination node based at least in part on route information received in association with the response to the explore frame, wherein the route information includes a node path; and transmitting an instruction to the destination node from the discovery node based on a reverse node path.06-17-2010
20120120791AUTOMATIC REDUNDANT LOGICAL CONNECTIONS05-17-2012
20120120792MONITOR/CONTROL DEVICE AND MONITOR TARGET DEVICE - A monitor and control device includes a monitor and control unit transmitting to a monitor target device a monitor and control signal (M&CS) through a M&CS path in a case of a malfunction occurred in a main signal path, and transmits to the monitor target device the M&CS through the main signal path in a case of a malfunction occurred in the M&CS path, the monitor target device including: a first path connection unit connected to the main signal path passing either a main signal in which the M&CS for monitoring and controlling the monitor target device is multiplexed or a main signal in which the M&CS is not multiplexed; a second path connection unit connected to the M&CS path passing the M&CS; and a selection unit selecting whether to perform transmission and reception of the M&CS by either one of the main signal path and the M&CS path.05-17-2012
20120120790Coordinated Fault Protection System - A power distribution protection system and method uses communications to coordinate operation of fault protection devices. Communications may be prioritized wherein messages of a lower priority are held or discarded in favor of messages of a higher priority, for example, messages indicating a fault condition. The devices may use multiple channel access schemes in accordance with a priority of a message to be communicated.05-17-2012
20100290340METHOD FOR PROTECTION SWITCHING - A method for protection switching of a ring network, which includes a plurality of nodes disposed in a ring shape, includes: allowing a node adjacent to a failure link among the plurality of nodes to generate a failure protection switching frame when the failure link is generated in the ring network; allowing the node adjacent to the failure link to transmit the failure protection switching frame to an adjacent node; allowing each of the plurality of nodes to delete address lists connected with the ring network except for an external network (hereinafter referred to as subnet) from their own forwarding table; allowing each of the plurality of nodes to transmit a subnet address list protection switching frame including a subnet address list; and allowing a node receiving the subnet address list protection switching frame to update the forwarding table on the basis of the subnet address list included in the frame.11-18-2010
20100246388REDUNDANT HOST CONNECTION IN A ROUTED NETWORK - One embodiment of the present invention provides a switch. The switch includes a management mechanism and a configuration mechanism. During operation, the management mechanism is configured to operate the switch in conjunction with the partner switch as a single logical switch. The configuration mechanism is configured to assign a virtual switch identifier to the logical switch.09-30-2010
20100246387NETWORK CONVERGENCE IN RESPONSE TO A TOPOLOGY CHANGE - In response to a network topology change, packets are initially flooded on ports of a network device. In addition, a bit array is cleared in response to the topology change. Each bit in the bit array is associated with a particular forwarding entry on the network device. In connection with the clearing of the bit array, the flooding of packets on ports of the network device is made conditional, reducing failover time of the network.09-30-2010
20100246386Method and System for Communicating Data Via a Mesh Network of Interconnected Femtocells - Aspects of a method and system for communicating data via a mesh network of interconnected femtocells are provided. In this regard, a plurality of femtocells and/or base stations may be interconnected to form a mesh network. A cellular enabled communication device may be enabled to communicate data to a first of the plurality of interconnected femtocells. The data may be routed by one or more other of the plurality of interconnected femtocells within the mesh network via one or more dynamically determined routes. The one or more dynamically determined routes may be determined based on one or more of a type of the communicated data, a quality of service (QoS) requested by the cellular enabled communication device for communicating the data and/or a cost associated with the routing of the data by the one or more other of the plurality of interconnected femtocells within the mesh network.09-30-2010
20120163166Ethernet Switch Ring (ESR) Protection Method And Transit Node - The present invention discloses an Ethernet Switch Ring (ESR) protection method, for introducing the pre-up state for the transit node, comprising, after the loop failure is recovered, the transit node on the loop will enter the pre-up state if not receiving the loop failure protocol message within the set time; and when the transit node is in the pre-up state and the loop is failed again, i.e., the transit node receives the loop failure protocol message in the pre-up state, the transit node opens the master and slave ports and refreshes the MAC address. Correspondingly, the present invention further discloses an ESR transit node. Since the pre-up state is introduced for the transit node and the transit node controls whether to open the recovered failed port by itself, the unsmooth flow caused by the master node which cannot notify the recovered failed port to open is avoided, and the ring network protection capability and user experience can be improved.06-28-2012
20120163165APPARATUS AND METHOD FOR PACKET TRANSPORT SERVICE BASED ON MULTI PROTOCOL LABEL SWITCHING-TRANSPORT PROFILE (MPLS-TP) NETWORK - There is provided a packet processing apparatus for transmitting packets received from a plurality of networks through a Label Switched Path (LSP), the packet processing apparatus including: a packet classifier to classify a received packet to a control packet or a normal packet based on port information included in field information of the received packet, and to decide, if the received packet is a normal packet, a service type for transmitting the normal packet according to whether the normal packet is a reception packet or a transmission packet; and a packet processor to acquire LSP condition information or address information from the field information of the normal packet, and to transmit the received packet and update the header or address information of the received packet, according to the service type decided by the packet classifier, with reference to the LSP condition information or the address information.06-28-2012
20120314566Method and Apparatus of Transmitting and Receiving Configuration Information of a Plurality of Cells in a Wireless System - A method and apparatus for transmitting and receiving configuration information of a plurality of cells in a wireless communication system are disclosed. A method for receiving configuration information of a plurality of cells by a terminal in a wireless communication system based on a carrier aggregation includes detecting a radio connection failure, transmitting a radio connection reestablishment request message to a cell from among a first plurality of aggregated cells, and receiving a radio connection reestablishment message including configuration information of a second plurality of aggregated cells from the cell from among the first plurality of aggregated cells.12-13-2012
20120134260NETWORK STABILIZER - A network device determines that an outgoing network-to-network interface has dropped one or more network control packets and incrementally adjusts, based on the determining, a drop threshold parameter for the network control packets to give preference to the network control packets over non-network control packets. After the adjusting, the network device monitors traffic over the interface, and preempts, based on the monitoring, a low-priority label switched path (LSP) using the interface when the interface reaches a congested threshold or when the interface has dropped one or more other network control packets. The network device restores the low-priority LSP to the interface when the interface has reached an uncongested threshold.05-31-2012
20120134262Resilient Data Communications with Physical Layer Link Aggregation, Extended Failure Detection and Load Balancing - Rapid channel failure detection and recovery in wireless communication networks is needed in order to meet, among other things, carrier class Ethernet channel standards. Thus, resilient wireless packet communications is provided using a physical layer link aggregation protocol with a hardware-assisted rapid channel failure detection algorithm and load balancing, preferably in combination. This functionality may be implemented in a Gigabit Ethernet data access card with an engine configured accordingly. In networks with various topologies, these features may be provided in combination with their existing protocols.05-31-2012
20120134261CONTEXT AWARE ADAPTIVE SWITCHING IN RECONFIGURABLE LOW EARTH ORBIT SATELLITE NETWORKS - A payload switching architecture for LEO satellite networks minimizes processing and storage requirements of payloads for deployment as small primary or secondary payloads, payloads perform only forwarding functions. Forwarding rules are provisioned in the payloads enabling them to reroute in case of failures or congestion without intervention from a ground station. Configuration rules are provisioned in the payloads enabling them to dynamically establish and remove interplane crosslinks without intervention from a ground station. The central network operations center on the ground computes forwarding rules and configuration rules for payloads and uploads the rules to the payloads.05-31-2012
20120213060SYSTEMS AND METHODS FOR SEAMLESS COMMUNICATIONS RECOVERY AND BACKUP - A recovery network may provide communication recovery and backup services to a carrier having a service area. The recovery network may be configured to communicatively couple the carrier to the public communication network (PCN) using one or more alternative communication paths, such as a satellite network. The alternative communication paths may couple the recovery network to the carrier independently of the PCN. When the carrier detects a failure in its uplink to the PCN, it may failover to the recovery network, which may service the communication requests using the alternative communication path(s). Similarly, the recovery network may be used to service inbound communication requests directed to the carrier or other organization, such as a Public Safety Answering Point (PSAP). When used with a PSAP, the recovery network may be configured to access and/or provide metadata related to inbound communication requests.08-23-2012
20120263035SYSTEM AND METHOD FOR CHANGING A DELIVERY PATH OF MULTICAST TRAFFIC - Multicast traffic is transferred, via routers, from a sender to receivers through a delivery tree that is determined based on a multicast routing protocol and includes delivery paths each communicably coupling the sender and one receiver. A router includes a multicast routing table used for transferring the multicast traffic through the delivery tree. The router generates delivery path information on first and second delivery paths each communicably coupling the sender and the router. Upon detecting a link failure on the first delivery path, the router performs delivery-path change processing that switches a first pair of interfaces along the first delivery path to a second pair of interfaces along the second delivery path without waiting for the multicast routing table being updated using the multicast protocol, and transmits a delivery-path change message to routers along the second delivery path so that the routers perform the delivery-path change processing.10-18-2012
20120082027Determining Optimum Delivery Conditions Associated with a Restoration Plan in a Communication Network - Technologies for determining optimum delivery conditions associated with a restoration plan that addresses potentially troubled nodes are generally disclosed.04-05-2012
20090016213METHOD FOR EFFICIENTLY TREATING DISTURBANCES IN THE PACKET-BASED TRANSMISSION OF TRAFFIC - The present disclosure relates to methods for efficiently treating disturbances in the packet-based transmission of traffic by means of a routing protocol and routing entities. According to an exemplary embodiment, a message signaling the non-availability of a neighboring routing entity is inspected. Once the message signaling the non-availability of a neighboring routing entity is received, a test message for verifying the information is sent. If the non-availability is confirmed upon inspection, the system deduces that there is a failure of the connection to the neighboring routing entity. The routing entity then occasions a change in routing in order to circumvent the failed connection. This configuration reduces the operations required for fault recovery in the network and protects the system from false error messages generated to disturb the network.01-15-2009
20110122766Smart Mechanism for Multi-Client Bidirectional Optical Channel Protection Scheme - Methods and apparatus for efficiently allowing protection switch information to be communicated on bidirectional lines are disclosed. According to one aspect of the present invention, a method for communicating protection switch information from a first network element to a second network element across bidirectional links that include at least one working line and a protection line involves obtaining a generic framing procedure GFP frame at the first network element. The GFP frame has a payload area with a client payload field. The method also includes defining a command field associated with the GFP frame that is in the payload area but not in the client payload field, and storing protection switch information in the command field.05-26-2011
20110122765Protection Against The Effect of Equipment Failure in a Communications System - A data communications system has a plurality of nodes connected by a plurality of links. A subset of the links and nodes forms a worker path for carrying worker data through the communications system, and a further subset of links and nodes provides a protection path for carrying other data in the absence of a fault in the worker path and for providing an alternative path for the worker data in the event of a fault in the worker path. The alternative path is predetermined prior to the detection of a fault in the worker path.05-26-2011
20100238798SYSTEM AND METHOD FOR MAINTAINING A BACKUP RADIO OPERATING PARAMETER LIST IN A SECONDARY USE COMMUNICATION SYSTEM - A radio communication system (09-23-2010
20120320739Fault Tolerant Communication in a Trill Network - Each of first and second bridges of a data network having respective external links to an external node implement a network bridge component that forwards traffic inside the network and a virtual bridge component that forwards traffic outside of the network. A virtual bridge is formed including the virtual bridge components of the first and second bridges and an interswitch link (ISL) between the virtual bridge components of the first and second bridges. Data frames are redirected via the ISL in response to a link-down condition of one of the external links.12-20-2012
20120320740PROTOCOL CIRCUIT LAYER - A protocol circuit layer is described. The protocol circuit layer may employ a routing layer to determine optimal routes when establishing a circuit. The circuit layer may employ a link layer to send data packets over links to other network nodes. A naming layer may employ circuits to establish a distributed database of associations between network node addresses and their network locations.12-20-2012
20110235506NETWORK-CONNECTION REDUNDANT SYSTEM FOR DEVICES WITH CASCADE NETWORKING CAPABILITY AND METHOD APPLIED ON THE SYSTEM - Disclosed is a network-connection redundant system for devices with cascade networking capability, and a method applied on the system. Every device capable of network connection preferably has two network ports, which are respectively connected to the same or different network nodes. The route of network packets can be controlled by defining the roles of ports. One emergent redundant connection is achieved. According to the preferred embodiment, every port is defined as one role such as forward port or blocked port after the network formed by the nodes and devices is initialized. It is featured that a plurality of connection-confirmation packets periodically transmitted or received by the network nodes are used to determine whether state of the connection changes or not. If there is any change, the role for each port is re-defined based on the relevant information. A redundant connection is then established.09-29-2011
20090046579Lesser disruptive open shortest path first handling of bidirectional forwarding detection state changes - A method and apparatus for processing link down events associated with links between adjacent nodes is described. A node receives link down events associated with a link fault protocol for a link between the node and a neighboring node. In response to receiving the link down event, the node removes a data structure associated with the neighboring node from a forwarding table associated with a routing protocol running on the node. The node reserves the data structure for speedy adjacency recovery. In addition, the node places the neighboring node in the initialize state of the routing protocol.02-19-2009
20120087238TERMINAL DEVICE AND RETRANSMISSION CONTROL METHOD - Provided are a terminal device and a retransmission control method which enable the reduction of the overhead of an uplink control channel when ARQ is applied in communication using an uplink unit band and a plurality of downlink unit bands associated with the uplink unit band. In a terminal (04-12-2012
20120327765MULTI-ROUTER IGP FATE SHARING - A method for routing communication traffic in a network includes detecting that a link in a parallel link configuration has failed and in response, adjusting one or more metrics associated with other links in the parallel link configuration to indicate that none of the links in the parallel configuration are available. A router connected to a direct link in a parallel link configuration including one or more other routers connected to one or more indirect links, respectively, includes a memory storing configuration parameters specifying a minimum number of links required to be operational in the parallel link configuration and an artificially high cost, and a link metric adjustment module operable to set a metric of the direct link to the artificially high cost until the minimum number of required links are operational after startup of the router or failure and reactivation of the direct link.12-27-2012
20120140617SYSTEM AND METHOD FOR PACKET PROTECTION SWITCHING - A method, a transmitter and a receiver of transmitting packets over radio communication links, wherein at least a first radio link and a second radio link are used for delivering flows of packets, said flows of packets containing protected packets and unprotected packets, the method comprising the steps of:—allocating at least one identification mark on a protected packet based on at least one parameter corresponding to the packet;—reproducing from a first protected packet, a second protected packet substantially identical to the first protected packet;—transmitting the first protected packet over the first radio links and the second protected packet over the second radio link;—transmitting a first unprotected packet on the first radio link and a second unprotected packet on the second radio link.06-07-2012
20130010592METHOD FOR CONTROLLING A CONTROL STATION, A METHOD FOR CONTROLLING TERMINAL STATION, A CONTROL STATION, A TERMINAL STATION, AND A COMPUTER READABLE STORAGE MEDIUM - A method for controlling a control station (H01-10-2013
20130016606METHODS AND APPARATUS FOR IMPROVING NETWORK COMMUNICATION USING ETHERNET SWITCHING PROTECTIONAANM Cirkovic; SashaAACI San FranciscoAAST CAAACO USAAGP Cirkovic; Sasha San Francisco CA USAANM Singal; Pawan K.AACI SunnyvaleAAST CAAACO USAAGP Singal; Pawan K. Sunnyvale CA USAANM Kuthanur; GowriAACI San JoseAAST CAAACO USAAGP Kuthanur; Gowri San Jose CA US - A network layout between network elements and routers using network redundancy to improve reliability of network communication is disclosed. Upon detecting a link failure associated with a primary link between an access switch and a primary router by the access switch via a connectivity verification protocol, the access switch sends a message to the primary router indicating connection defect via the connectivity verification protocol such as IEEE 802.1 ag standard. After enabling protection switching mechanism to activate a secondary link between the access switch and a backup router for network communication, routing data streams are routed between the access switch and the router via the secondary link. In one aspect, the protection switching mechanism is operated in accordance with G.8031 under International Telecommunication Union (“ITU”) standard.01-17-2013
20110158087SYSTEMS AND METHODS FOR REDUCING REFLECTIONS AND FREQUENCY DEPENDENT DISPERSIONS IN REDUNDANT LINKS - A network device includes a group of high speed redundant transmission lines and a switch. The switch is configured to select one of the high speed redundant transmission lines. The switch causes reflections and frequency dependent dispersions in the selected high speed redundant transmission line. The network device further includes a transmitting device that is configured to adjust signals transmitted over the selected high speed redundant transmission line so as to reduce the reflections and frequency dependent dispersions.06-30-2011
20110158086PACKET RING NETWORK SYSTEM, PACKET FORWARDING METHOD AND NODE06-30-2011
20130021900SATELLITE-BASED MESSAGING SYSTEM - In a satellite-based messaging system messages are exchanged between a ground station and mobile terminals over a wide geographic area covered by multiple satellite beams. Each beam contains one or more carrier frequencies. A message processing center is configured to provision a frame comprising a plurality of subframes to carry data over a forward link to the mobile terminals; hop between beams in the forward link and assign each subframe within a frame to a specific satellite beam; provision a transport medium in the form of virtual carriers each defined by one or more carrier frequency/beam hop combinations, wherein each virtual carrier is assigned a unique virtual carrier identifier; and notify the mobile terminals of carrier frequency/hop combinations for assigned virtual carrier identifiers.01-24-2013
20130201821COMMUNICATION SYSTEM, CONTROL DEVICE, NODE, PROCESSING RULE SETTING METHOD AND PROGRAM - A communication system includes a plurality of nodes and a control device. Each node includes a packet processor that processes a packet in accordance with a processing rule when the packet is received. The processing rule correlates the processing applied to the packet with a matching rule that identifies the packet the processing is to be applied to. The control device calculates a packet forwarding path in response to a request for setting processing rules from any node, sets processing rules that implement the packet forwarding path on the node on the packet forwarding path and records the processing rules in a manner coordinated with one another. The control device inquires at the node on the packet forwarding path about state of setting of processing rule and, upon detecting failure in the processing rule set in at least one node, executes rollback operation on the correlated processing rules set in other node.08-08-2013
20080253282SYSTEM AND METHOD FOR TRANSMITTING A DATA FLOW VIA BUNDLED NETWORK ACCESS LINKS AS WELL AS AN AUXILIARY TRANSMITTER AND RECEIVER DEVICE AND TRANSMISSION AND RECEIVING METHODS THEREFORE - The present invention relates to a system for transmitting a data flow (a) from a transmitter device (10-16-2008
20080232246System and Method For Protection of a Multicast Traffic Path - The core of a system and method for protecting multicast service path is: each multicast transmission coequal entity can transmit the service to another multicast transmission coequal entity by setting multiply multicast transmission coequal entities, accordingly, when there is abnormity in the service source of multicast transmission coequal entity, it can receive the service from another multicast transmission coequal entity connected with it and transmit the service in order to ensure that the service is successfully transmitted even though there is fault in the resource node of the service. It realizes the N+1 and N:1 multicast path protection. By applying the invention, we can realize the protection turnover of the multicast service simply and effectively, and ensure the normal transmission of the multicast service.09-25-2008
20130170338IMPLEMENTING REDUNDANCY ON INFINIBAND (IB) NETWORKS - Method embodiments are provided to improve efficiency of systems operating on internet protocol (IP) over Infiniband (IB) networks. In an embodiment, by way of example only, a method is provided for implementing redundancy for IB networks. The method includes detecting a failure at a first source port of a source node having a plurality of source ports, selecting a new source port, sending an address resolution protocol (ARP) message to one or more other nodes in communication with the source node including an IP address of the source node and IB address of the new source port of the source node, and re-balancing host traffic.07-04-2013
20130170339Fault Tolerant Communication in a Trill Network - Each of first and second bridges of a data network having respective external links to an external node implement a network bridge component that forwards traffic inside the network and a virtual bridge component that forwards traffic outside of the network. A virtual bridge is formed including the virtual bridge components of the first and second bridges and an interswitch link (ISL) between the virtual bridge components of the first and second bridges. Data frames are redirected via the ISL in response to a link-down condition of one of the external links.07-04-2013
20130176845Determining Backup Forwarding Paths Based on Route Distinguisher Correlation Values - In one embodiment, a packet switching device determines backup forwarding paths based on route distinguisher correlation values. A route distinguisher correlation value is some value associated with multiple routes, which allows a packet switching device to consider routes associated with a same route distinguisher correlation value, but having different route distinguishers and a same prefix to be considered as going to a same destination. Examples of route distinguisher correlation value used in one embodiment include, but are not limited to: scalar values, a route distinguisher of a different route, a virtual private network associated with a different route; a route target associated with the a different route; or a Border Gateway Protocol (BGP) Next-hop address associated with a different route.07-11-2013
20080219153Constructing a repair path in the event of failure of an inter-routing domain system link - An apparatus and method as described for constructing a repair path for use in the event of failure of an inter-routing domain connection between respective components in first and second routing domains of a data communications network. The apparatus is arranged to assign a propagatable repair address for use in the event of failure of the inter-routing domain connection and to propagate the repair address via data communications network components other than the inter-routing domain connection.09-11-2008
20110273980Distributed Failure Recovery in a Routed Etherent Network - Link identifiers such as VIDs, selected from a defined range of values, are locally assigned by each node on a link state protocol controlled Ethernet network to each of its links or adjacencies. The link identifiers are assigned by the nodes such that each link or adjacency at the node is uniquely identified by a different link identifier. A link state protocol adjacency notification mechanism or other flooding mechanism is used to disseminate the locally assigned link identifiers to other nodes on the link state protocol controlled Ethernet network. The link identifiers are added by the nodes to their topology databases to enable detour routes to be locally calculated by the nodes on the network in a distributed manner. Upon occurrence of a failure, the link identifiers are used to source route traffic around the failure so that traffic may continue to traverse the link state protocol controlled Ethernet network.11-10-2011
20110273979METHOD AND APPARATUS FOR PSTN-BASED IP ACTIVE CALL RECOVERY AND RE-ROUTING - A method for rerouting IP (Internet Protocol) telephony call information includes, during an active IP telephony call made by a first IP telephony phone for originating IP telephony calls over an IP network, with a boundary element, actively detecting a network failure condition in the IP network which indicates a switchover to a PSTN (Public Switched Telephone Network) network and generating a failure notification; and with a server for receiving the failure notification, generating a dynamic switchover instruction generated that is sent to the first IP telephony phone, the dynamic switchover instruction initiating automatic switchover of the active IP telephony call to a PSTN network. A method for rerouting IP (Internet Protocol) telephony call information includes, with a server, monitoring an IP network for route failures; and with the server, generating a switchover instruction when an active IP telephony call is interrupted by a route failure. The switchover instruction initiates automatic switchover of the active IP telephony call to a fallback call routed through a Public Switched Telephone Network (PSTN). The switchover instruction includes information which identifies the fallback call as a replacement for the active IP telephony call.11-10-2011
20130094354METHODS AND SYSTEMS FOR AUTOMATICALLY TRACKING THE REROUTING OF LOGICAL CIRCUIT DATA IN A DATA NETWORK - An example method involves rerouting data from a logical circuit to a logical failover circuit when the logical circuit fails based on an exceeded quality of service parameter. The logical failover circuit is selected based on a committed bit rate, a variable bit rate, or an unspecified bit rate. The example method also involves rerouting data from a first set of switches to a second set of switches in the absence of a failure associated with the logical circuit. The logical circuit comprises variable communication paths, and the second set of switches are to form a route associated with the variable communication paths that is not predefined and that is dynamically defined at a time of automatic rerouting while maintaining the logical circuit through the second set of switches.04-18-2013
20130094353APPARATUS AND SYSTEM FOR AN ACTIVE STAR/STUB/RING CONTROLLER AREA NETWORK PHYSICAL LAYER TRANSCEIVER - A controller area network (CAN) node comprises an internal high differential bus line (CANH) and an internal low differential bus line (CANL). The CAN node further comprises a receiver (RXD) comparator coupled to both the internal CANH and the internal CANL that outputs an internal RXD signal. The CAN node further comprises an RXD dominant time out (DTO) circuit. The RXD DTO circuit includes: a) an RXD dominant transition detector coupled to an output of the RXD comparator; b) a timer triggered by the RXD dominant transition detector detecting a dominant RXD transition; c) an RXD dominant timer comparator that is coupled to an output of the timer which compares an output of the timer to a selected value; d) an internal RXD dominant signal is changed to an RXD DTO recessive signal after a selected time interval has lapsed and can include a fault output to signal this fault condition.04-18-2013
20130094352Self-Healing Communications Network - A self-healing communications network including a network bus that connects a plurality of field controllers. Each field controller is configured to operate an element of a system installed in a building or similarly large structure, and each is connected to the network bus. An end-of-line resistor can be automatically enabled in any field controller to designate that field controller as a terminal device on the network bus. In an embodiment, a parent controller detects each field controller on the network bus, and monitors and controls operation of the plurality of field controllers via commands transmitted over the network bus. The parent controller has first and second receiver/transmitter ports, both connected to the network bus. The parent controller is configured to automatically repair a break in the network bus by enabling at least one end-of-line resistor in one of the plurality of field controllers in order to properly terminate the network.04-18-2013
20130114401METHOD AND APPARATUS FOR RESELECTING A DIFFERENT TRANSMISSION TIME INTERVAL RESOURCE - A method, apparatus and computer program product are provided in order to allow for reselection of a TTI resource, such as in an instance in which a mobile terminal has moved to a different portion of the coverage area and/or in an instance in which the TTI resource was initially incorrectly selected, such as based upon an inaccurate measurement. In the context of a method, a first TTI resource is selected in conjunction with an uplink. The method also detects a failure condition associated with the uplink and selects a second TTI resource, different than the first TTI resource, in response to detection of the failure condition.05-09-2013
20130114402METHOD AND APPARATUS FOR DETECTING AND LOCATING NETWORK CONNECTION FAILURES - In one aspect, the present invention addresses Layer-3 (L3) connection monitoring between two “multi-attached” host nodes that are interconnected via an intervening communication network having a known network topology. The present invention provides the two-fold benefit of rapid connection failure detection and failure location determination. In one or more embodiments, the present invention “pinpoints” the failure location, improving the intelligence of any triggered failure recovery mechanism and/or providing better, more meaningful failure reporting. A BFD session is established between the local and remote host nodes for each L3 communication path between them, e.g., for each unique pairing of local and remote network attachment points. Upon the occurrence of an L3 connection failure, the pattern of up/down states for these BFD sessions is analyzed, along with knowledge of the involved network topology, to determine the apparent location of the L3 connection failure.05-09-2013
20110267941PINNING AND PROTECTION ON LINK AGGREGATION GROUPS - A device may assign a virtual local area network (VLAN) to one or more specific links in a link aggregation group (LAG), and send traffic from the VLAN on the assigned one or more specific LAG links. Traffic from the same VLAN may be sent on one link in the LAG by selecting a hashing criterion or by pinning the VLAN to a primary link in the LAG and another link for redundancy purposes.11-03-2011
20130128726SYSTEM AND METHOD FOR PACKET DELIVERY BACKTRACKING - Traditional computer networks have been designed with the need for highly reliable packet delivery. This is largely handled by a centrally managed simple send-acknowledge protocol. In a highly dynamic mesh network, these methods are inadequate to ensure the most reliable packet delivery. This invention uses the natural redundancy of routes in a mesh and other techniques to increase the reliability of a network, even as the paths to any given node are dynamic in nature.05-23-2013
20130128725METHODS, APPARATUS AND COMMUNICATION NETWORK FOR PROVIDING RESTORATION SURVIVABILITY - The invention relates to a method and an apparatus for proving protection in a connection oriented packet switched communications network. Embodiments of the invention disclose detecting a fault in a path of the network, the path comprising at least one network resource, determining a new path for the traffic, restoring the traffic to the new path, and determining where the fault has occurred in the path using the management plane to correlate the fault with the at least one network resource using a configuration map of the network. The embodiments of the invention provide for dynamic protection using a management plane in the event of a failure in the network.05-23-2013
20130128724SYSTEM AND METHOD FOR BACKUP COMMUNICATION USING POWER OVER ETHERNET - A system and method for providing backup communications using Power over Ethernet (PoE) are disclosed. A backup communication system (BCS) is provided as part of a networked (TCP/IP) hospital communication system. The BCS is coupled to a power line used to provide power to a PoE switch. When TCP/IP communications are interrupted, the BCS receives patient call signals from patient room terminals over a secondary communication mode of the power line, and transmits those call signals to a nurses' station. The call signals can be generated by coupling a pulse-coded AC signal onto the PoE wires, or by sending voltage coded data in one direction and current-coded data in the other direction. Different signals or signal levels can be used to distinguish normal patient calls, patient emergency calls, and code calls. Thus, basic communications can be achieved when TCP/IP are unavailable. Other embodiments are disclosed and claimed.05-23-2013
20130128723UPSTREAM CHANNEL BONDING PARTIAL SERVICE USING SPECTRUM MANAGEMENT - A method and computing device receives data packets on an upstream bonding group in full service mode, where the upstream bonding group includes a set of channels and each channel has a transmission quality. The method detects that a select channel in the set of channels is impaired when the transmission quality of the select channel is below a threshold value, and transitions the receiving of the data packets from full service mode to partial service mode by disabling data grant scheduling on the select channel. The method monitors the select channel using a spectrum management method while the receiving of the data packets is in partial service mode. The method transitions the receiving of the data packets from partial service mode to full service mode when a result from the spectrum management method indicates that the select channel can transmit data packets error free.05-23-2013
20130142035METHOD AND APPARATUS OF PERFORMING A MULTI-CHANNEL DATA TRANSMISSION - Disclosed are an apparatus and method of performing a data channel change-over procedure. One example method of operation may include detecting an abnormality in an active data communication channel established between at least two endpoint devices. The method may further provide selecting a next available data communication channel based on at least one data channel metric and transmitting at least one change-over message via an active control channel established between the at least two endpoints. The method may further include transmitting subsequent data messages over the next available data communication channel.06-06-2013
20110211446GIGABITS ZERO-DELAY TAP AND METHODS THEREOF - A gigabits zero-delay arrangement for enabling continuous monitoring of data traversing through a network in a high-speed Ethernet environment is provided. The arrangement includes a high-speed network device configured for monitoring the data flowing through the network. The arrangement also includes a primary power source for providing a first power to circuitry of the gigabits zero-delay arrangement. The arrangement further includes a sensor controller configured for monitoring power flowing into the high-speed network device and for establishing an alternative communication link.09-01-2011
20130148493Providing an Alternative Media Channel in a Virtual Media System - A virtual communication channel is established between a virtual server and a virtual controller. The virtual communication channel can support one or more media communications, such as audio, voice, and text communications. The virtual controller determines that the virtual communication channel cannot be sustained. In response to determining that the virtual communication channel cannot be sustained, a media controller provides an alternative communication channel. The alternative communication channel is used to provide the one or more media communications.06-13-2013
20130148494Dynamic Bandwidth Adjustment in Packet Transport Network - A method for adjusting bandwidth in a communications network having a plurality of nodes connected over multiple links with a plurality of services running on the links includes detecting an impairment of a link wherein the impairment invokes a reduction in bandwidth available to the services running on the link, communicating information about the impairment to other nodes in the network and redistributing services between the links to limit a bandwidth required by services running on the impaired link to a value not exceeding the bandwidth available on the impaired link.06-13-2013
20130148495A METHOD OF ROUTING AND A DEVICE FOR AN AUTONOMOUS SYSTEM - The disclosure relates to a method of routing for an Autonomous System AS in a communication system, in which the AS comprises a plurality of network devices including a first network device and a second network device. The first network device distributes routing information to a forwarding table by calculating a first route from the first network device to the second network device. The first network device receives information of a destination network device of the communication system from the second network device, and forms a second route from the second network device to the destination network device to be stored in the forwarding table using the received information of the destination network device. When the first route fails, the first network device calculates a third route from the first network device to the second network device and updates the routing information in the forwarding table according to the third route.06-13-2013
20130148496COMMUNICATION MANAGEMENT APPARATUS, COMMUNICATION NODE, AND DATA COMMUNICATION METHOD - A communication management apparatus that manages transmission of data in a network in which plural communication nodes are connected via a transmission line in a ring shape, the apparatus including: a network-presence checking unit that transmits a network-presence-check frame in broadcast and generates network connection information indicating a connection state among the connection nodes from a received network-presence-check acknowledge frame, a token-circulation-order determining unit that determines token circulation order; a setup processing unit that performs setup processing for notifying each of the communication nodes of a token circulation destination; a data-frame-communication processing unit that performs transmission and reception of a data frame using a token frame; and a line-connection managing unit that disables, when the network has a ring configuration, any one of ports of any one of the communication nodes to prevent a connection state of the network from becoming a ring shape.06-13-2013
20120275298Constructing A Transition Route In A Data Communications Network - A method is described of constructing a transition route in a data communication network having as components nodes and links. Upon receipt of a transition notification identifying a first component a non-neighboring node constructs a transition route around the first component. In an embodiment, a node performs detecting the first component transition; issuing a transition notification identifying the first component and recognizable by nodes configured to construct a transition route around the first component; and upon expiry of a notification transition period, issuing a transition advertisement recognizable by all nodes on the network.11-01-2012
20120275297Multi-Chassis Link Aggregation on Network Devices - A data communication network includes a client device and multiple aggregation devices coupled to each other and the client via links within a link aggregation group (“LAG”) across the aggregation devices. The aggregation devices appear to the client as a single device coupled thereto, and operate in conjunction with each other by assigning at least one different identifier to each of the plurality of separate aggregation devices and storing information including the identifiers to association tables located on each of the aggregation devices. The multiple aggregation devices can be separate switches, and the LAG can include multiple ports across the switches, with a different identifier being assigned to each of the ports in the LAG. A virtual link trunk interface can couple aggregation devices, which can reconfigure communication paths thereacross with respect to the client device using the identifiers in the stored association tables when a LAG link fails.11-01-2012
20120275296Protection Switching Method and System for Ethernet Dual-homed Link - The disclosure provides a protection switching method for an Ethernet dual-homed link, which comprises: a node on one path of a dual-homed link detects that a failure occurs in a link or node which is directly connected with the node per se; when the node which detects the failure is a non-master node, the non-master node continuously transmits N failure state protocol (SF) messages outwards through a non-failed port on the failure path; after receiving the SF messages, the master node switches traffic on the failure path to an available path. The disclosure further provides another protection switching method for an Ethernet dual-homed link and a protection switching system for an Ethernet dual-homed link. By means of the disclosure, when a failure occurs in a link or node, a fast protection switching for the Ethernet dual-homed link can be realized; moreover, when the link or node recovers from the failure, a fast backward switching for the Ethernet dual-homed link can be realized as required actually.11-01-2012
20130155847METHODS AND APPARATUS TO ENHANCE RELIABILITY IN MILLIMETER WAVE WIDEBAND COMMUNICATIONS - A network node in a wireless network performs a method for enhancing reliability in wireless communication. The method includes determining, at a first network node, that a current link with a second network node is broken. The method also includes attempting, at the first network node, to recover the current link. The method further includes, upon a determination that the current link is not recoverable, establishing, at the first network node, a new link with the second network node according to one of a plurality of switching rules, the switching rules ordered according to a priority among the switching rules.06-20-2013
20130155848LINK ADAPTATION IN WIRELESS NETWORKS - An embodiment of a system for physical link adaptation in a wireless communication network such as e.g., a WLAN, selectively varies the physical mode of operation of the transmission channels serving the mobile stations in the network. The system includes an estimation module to evaluate transmission losses due to collisions as well as transmission losses due to channel errors over the transmission channel, and an adaptation module to select the physical mode of operation of the transmission channel as a function of the transmission losses due to collisions and to channel errors as evaluated by the estimation module.06-20-2013
20130155845METHOD FOR PROVIDING BORDER GATEWAY PROTOCOL FAST CONVERGENCE ON AUTONOMOUS SYSTEM BORDER ROUTERS - Techniques are disclosed for providing fast convergence on Autonomous System Border Routers (ASBRs). In an embodiment, an ASBR receives first Virtual Private Network (VPN) route information including a first route target, a first route distinguisher, and a first network prefix and second VPN route information including a second route target, a second route distinguisher and a second network prefix. The second route distinguisher received by the ASBR is different than the first route distinguisher. The ASBR compares the first route target to the second route target and the first network prefix with the second network prefix. In response to determining that the first route target matches the second route target and the first network prefix matches the second network prefix, the ASBR associates, in a routing table, a first path based on the first VPN route information with a second path based on the second VPN route information.06-20-2013
20130155846Active Standby Virtual Port-Channels - An active-standby virtual port channel mechanism may be provided, where at any point only one virtual port channel link would be active. Upon failover of the active, a fast failover mechanism is employed to move active traffic to a standby port channel link.06-20-2013
20120281526SUPPORTING OAM ON PROTECTING CONNECTIONS IN SHARED MESH PROTECTION ENVIRONMENT - A method for detecting the liveliness and synchronizing the control-plane and data-plane on protecting connections in a shared mesh network environment through methods for probing the protecting connection conditions by sending in-band messages; and synchronization of control plane and data plane by using LSP-ping messages on the protecting connections.11-08-2012
20120281525METHOD AND SYSTEM FOR PRIORITY BASED (1:1)n ETHERNET PROTECTION - A method and system for priority based (1:1)11-08-2012
20110280122SIGNALING PROCESSOR AND LINK SWITCHING METHOD - A signaling processor has a message transfer part for a Layer 2 operable to notify a message transfer part for a Layer 3 of a signal indicative of stop (release) completion of a link being connected when it receives a response to a request for a link release process after detection of a failure of the link being connected and notification of the request for the link release process to a correspondent signaling processor and a message transfer part for the Layer 3 operable to perform a retrieval process of a received signal that has not been retrieved and has been stored in the message transfer part for the Layer 2 when it receives the signal indicative of stop (release) completion of the link.11-17-2011
20110292790MOBILE COMMUNICATION METHOD AND RADIO BASE STATION - A mobile communication method involving performing, at a mobile station UE which establishes a first connection in a first cell, a cell selection process at the time of detecting a failure in the first connection, transmitting, from the mobile station UE to a second cell selected in the cell selection process, a connection re-establishment request signal, determining, at a radio base station that manages the second cell, whether or not to store context information of the mobile station UE in response to the connection re-establishment request signal, acquiring, at the radio base station, the context information of the mobile station UE from a radio base station that manages the first cell, when determining that the context information of the mobile station UE is not stored, and establishing a second connection in the second cell for the mobile station UE, based on the context information of the mobile station UE.12-01-2011
20110310730HVPLS HUB CONNECTIVITY FAILURE RECOVERY WITH DYNAMIC SPOKE PSEUDOWIRES - Techniques for recovering from hierarchical virtual private LAN service (HVPLS) hub connectivity failure with a dynamic spoke pseudowire. According to one embodiment of the invention, a provider edge (PE) network element in the HVPLS hub monitors for a failure of HVPLS hub connectivity failure and reuses an HVPLS spoke connectivity failure recovery mechanism in an MTU by fabricating failure of one or more spoke facing connectivity elements coupling the MTU with the PE network element causing the MTU to transition to a secondary PE network element in the HVPLS hub. In addition, the PE network element establishes a dynamic spoke pseudowire for each virtual instance affected with the MTU to restore HVPLS hub connectivity for that PE network element.12-22-2011
20110310729Maintaining balance of active links across network devices in a double-sided virtual port-channel environment - In one embodiment, a method includes configuring a first network device for operation in a first logical group with a second network device, receiving information from other network devices configured for operation in a second logical group, the information uniquely identifying each of the other network devices within the second logical group, and assigning a priority to each link connecting the first network device to the second logical group network devices. A portion of the links are selected as active links based on the link priorities and the link priorities are assigned such that a balance of active links is maintained across the second logical group network devices. An apparatus for maintaining a balance of active links across the network devices is also disclosed.12-22-2011
20120008492METHODS AND SYSTEMS FOR ENABLING END-USER EQUIPMENT AT AN END-USER PREMISE TO EFFECT COMMUNICATIONS HAVING CERTAIN ORIGINS WHEN AN ABILITY OF THE END-USER EQUIPMENT TO COMMUNICATE VIA A COMMUNICATION LINK CONNECTING THE END-USER EQUIPMENT TO A COMMUNICATIONS NETWORK IS DISRUPTED - A method for effecting communications, such as telephone calls, accesses to data network sites, alarm system communications, and/or other communications, having certain origins over a communications network. The method comprises: receiving a request for a communication originated by first end-user equipment at a first end-user premise when an ability of the first end-user equipment to communicate via a first communication link connecting the first end-user equipment to the communications network is disrupted; determining, based on an origin of the communication, that the communication is to be effected over the communications network; and causing information pertaining to the communication to be exchanged between the first end-user equipment and the communications network via a wireless communication link established between the first end-user equipment and second end-user equipment at a second end-user premise and a second communication link connecting the second end-user equipment to the communications network. Also provided are apparatus and computer-readable media containing a program element executable by a computing system to perform such a method.01-12-2012
20120014247INTERFACE MONITORING FOR LINK AGGREGATION - The present invention provides network interface monitoring and management that may be employed with link aggregation technologies. Multiple network interfaces may be aggregated into a single bond and data may be transferred to and from a backbone network via this aggregated bond. A link aggregation monitor employs a heartbeat generator, sniffer and data store to keep track of health and availability of network interfaces. The heartbeat generator sends heartbeats to the network interfaces, which pass the heartbeats around in a token ring configuration. If a network interface fails or otherwise goes offline, detection of this condition causes the monitor and heartbeat generator to prepare new or modified heartbeats so that data may be efficiently and accurately routed around the token ring and health of all remaining alive interfaces can be monitored properly. If a network interface re-enters or is added to the aggregate bond, new/modified heartbeats are then employed.01-19-2012
20120020207RE-ROUTING TRAFFICE IN A COMMUNICATIONS NETWORK - Method of re-routing traffic in a communications network (01-26-2012
20130194914LINK AGGREGATION IN SOFTWARE-DEFINED NETWORKS - One embodiment of the present invention provides a switch capable of processing software-defined data flows. The switch includes an identifier management module and a flow definition management module. During operation, the identifier management module allocates a logical identifier to a link aggregation port group which includes a plurality of ports associated with different links. The flow definition management module processes a flow definition corresponding to the logical identifier, applies the flow definition to ports in the link aggregation port group, and update lookup information for the link aggregation port group based on the flow definition.08-01-2013
20120087237SYSTEM AND METHOD FOR PROTECTING PAYLOAD INFORMATION IN RADIO TRANSMISSION - System and method for improving the protecting radio channels in transmission, according to which the payload information of the signal to be transmitted is divided into a plurality of data portions of smaller size which are then grouped into packets and the packets are labeled based on a criterion from among a plurality of criteria, said criterion being indicative of a level of priority associated to said packets. The packets are subsequently radio transmitted in accordance with their level of priority indicated by their associated label.04-12-2012
20130208583Avoiding Broken Links in Smart Meter Networks for Loop-Free Routing of Packets - Broken links in a sensor network are avoided by representing the network as a DODAG. A rank associated with each node defines a position of each node relative to other nodes, and the rank is in a form of a proper fraction, and the rank of each node never increases to enable loop-free routing.08-15-2013

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