Patent application number | Description | Published |
20100226245 | METHOD 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 |
20100290340 | METHOD 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 |
20100296416 | METHOD FOR UPDATING FILTERING DATABASE IN MULTI-RING NETWORK - A method for updating a filtering database in a multi-ring network, includes: when the topology of a lower ring in a multi-ring network, in which a plurality of ring networks are connected by two ring connection nodes, is altered and the ring connection node detects the alteration in the topology of the lower ring, erasing, by the ring connection node, its filtering database; generating, by the ring connection node, a control message including a ring ID, a blockage flag, and an erasure flag; transmitting the control message in both directions of the ring; and determining, by a node which receives the control message, to erase a filtering database by referring to and correcting the blockage and erasure flag information included in the control message. | 11-25-2010 |
20100302967 | METHOD AND APPARATUS FOR MEASURING NETWORK DELAY IN ETHERNET RING NETWORK - A node generates a delay measurement frame and transmits it to an adjacent node of an Ethernet ring network in order to measure a delay of the network. The node receives the delay measurement frame generated by the node from another adjacent node of the ring network, and measures a network delay by using the received delay measurement frame. | 12-02-2010 |
20110019536 | METHOD FOR MANAGING ETHERNET RING NETWORK OF VLAN-BASED BRIDGE - There is provided a method for managing an Ethernet ring network of a VLAN-based bridge that includes: registering a major-ring VID (VLAN ID) in a ring port filtering database of a ring protection link owner node in accordance with a request for registering the major ring VID (VLAN ID) from an ERP (Ethernet Ring Protection) controller mounted on the ring protection link owner node of a major ring; delivering, by the ring protection link owner node, a VID registration message to other nodes which belong to the major ring through a ring port; receiving the VID registration message through the ring port and registering the major ring VID in a ring port filtering database of each node itself, by each node which belongs to the major ring; and delivering, by each node which belongs to the major ring, the VID registration message to other nodes which belong to the major ring through the ring port. | 01-27-2011 |
20110044162 | METHOD OF FLUSHING FILTERING DATABASE IN ETHERNET RING NETWORK - A method in which a node of an Ethernet ring network flushes a filtering database includes operating a timer for delaying flushing of the filtering database when a topology of the ring network is changed, and flushing the filtering database when the timer is terminated. A method in which a node of an Ethernet ring network flushes a filtering database includes flushing the filtering database after receiving a protection switching frame that requests flushing of the filtering database, and forwarding a data frame in a queue state at a node and then forwarding the protection switching frame to an adjacent node. A method in which a node of an Ethernet ring network flushes a filtering database includes flushing the filtering database after receiving a protection switching frame that requests flushing of the filtering database, and deleting a data frame in a queue state at the node. | 02-24-2011 |
20110044166 | METHOD FOR OPERATING NODE IN ETHERNET RING NETWORK - A ring protection link (RPL) owner node in a ring network transmits a ring-automatic protection switching (R-APS) frame in a burst mode until blocked ports of all nodes except the RPL owner node have been unblocked, and, if it is determined that all the nodes have been unblocked, transmits the R-APS frame in a continuous mode. In this manner, the time required to unblock all the nodes can be reduced. | 02-24-2011 |
20120082026 | APPARATUS AND METHOD FOR PROTECTION SWITCHING FOR MESH TOPOLOGY - Provided are a shared mesh protection switching apparatus and method. The shared mesh protection switching apparatus includes a plurality of linear protection switching processors allocated to the linear protection domains respectively and configured to provide a switching report signal in response to fault occurrence in the corresponding linear protection domains or a linear protection switching operation, and perform a function of limiting use of the shared section in response to a provided lock signal, and a mesh protection switching processor configured to select at least one linear protection domain to be limited in use of the network resources of the shared section according to a predetermined reference when the switching report signal is provided and provide the lock signal to a linear protection switching processor corresponding to the at least one selected linear protection domain. | 04-05-2012 |
20120294140 | METHOD AND APPARATUS FOR SHARED MESH PROTECTION SWITCHING - A method for protection switching in a shared node where protection resources of a plurality of end-to-end linear protection domain are shared is provided. The shared node receives a first protection switching event message notifying that a protection switching event occurs from a first node of a first end-to-end linear protection domain, and determines whether to prohibit protection switching on a second end-to-end linear protection domain by comparing a priority of the first end-to-end linear protection domain with a priority of the second end-to-end linear protection domain. | 11-22-2012 |
20130077479 | METHOD 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 |
20130083652 | APPARATUS AND METHOD OF SHARED MESH PROTECTION SWITCHING - A method of performing protection switching in which congestion does not occur at a shared segment and that can rapidly perform linear protection switching while using an 1-phase automatic protection switching protocol is provided. An end node that requests protection switching awaits by a time that is previously set to a timer and stops use of a shared protection segment for a standby time of the end node and thus traffic that is injected to a shared node reduces, whereby a congestion situation of a shared protection segment does not occur and thus a protection switching protocol is prevented from abnormally operating. | 04-04-2013 |
20130121140 | METHOD OF SHARED MESH PROTECTION SWITCHING - A method of performing shared mesh protection switching in a sharing node is provided. The method includes: receiving a request message from a first terminal node, having detected a signal failure of a working path; copying the request message and forwarding a request message to an adjacent node on a first protection path of a plurality of protection paths; determining whether a sharing resource is available; transmitting, if a sharing resource is available, an available message to a second terminal node forming a pair with the first terminal node; and receiving a response message from the second terminal node, having received the available message from all sharing nodes on the first protection path. | 05-16-2013 |
20130128720 | METHOD AND APPARATUS FOR PROTECTION SWITCHING IN POINT-TO-MULTIPOINT NETWORK - A method of performing protection switching in a network including a first node and a plurality of second nodes that are connected to the first node is provided. The first node counts the number of obstacles that have occurred in a plurality of paths that are connected between the plurality of second nodes, and if the counted number is smaller than a predetermined threshold value, the first node performs protection switching per leaf. Alternatively, if the counted number is equal to or larger than a predetermined threshold value, the first node performs protection switching per tree. | 05-23-2013 |
20130272128 | METHOD AND APPARATUS OF DETERMINING BLOCKING IN RING NETWORK - An apparatus of determining blocking in an Ethernet ring network sets blocking with respect to each of the plurality of links in an Ethernet ring network, and determines one of the plurality of links as a link to be blocked by using traffic request amounts of a plurality of service flows with respect to the respective links set to be blocked. | 10-17-2013 |
20140071813 | PROTECTION SWITCHING METHOD AND APPARATUS - In a network in which a plurality of protection paths have been formed for one working path between a first node and a second node, each node determines preference levels corresponding to an order to be preferentially used when performing protection switching on the plurality of protection paths. Next, each node exchanges pieces of information about the preference levels determined for the plurality of protection paths. | 03-13-2014 |
20140153928 | COMMUNICATION APPARATUS IN WIDEBAND WIRELESS OPTICAL COMMUNICATION SYSTEM BASED ON FREE SPACE, AND TRANSMISSION AND RECEPTION METHOD USING THE SAME - In a wireless optical communication system in which communication is performed based on a free space and a plurality of the communication apparatuses are arranged in a ring form around a central office terminal (COT), the communication apparatus monitors optical signals received in a first direction or in a second direction opposite to the first direction, and selects a first path through which the optical signals in the first direction are received and a second path through which the optical signals in the second direction are received. The communication apparatus converts an optical signal having a predetermined unique wavelength from among the optical signals received through the selected path into a signal of a frequency domain having a plurality of subcarriers, and obtains packet data mapped to each of the subcarriers. | 06-05-2014 |
20140219080 | METHOD AND APPARATUS FOR INTERWORKING PROTECTION SWITCHING - In a multi-domain network in which at least one working interconnected node and at least one protection interconnected node are formed between a first service end node and a second service end node, when a failure has occurred in both a working transport entity and a first protection transport entity of a node, a node having recognized a failure performs switching to a second protection transport entity that is connected to a corresponding interconnected node. | 08-07-2014 |
20140247712 | METHOD OF PERFORMING SHARED MESH PROTECTION SWITCHING - A method of performing shared mesh protection switching in which congestion does not occur in a sharing segment and that quickly performs linear protection switching while using a 1-phase automatic protection switching protocol is provided. For protection switching of a working path that is included in a end-to-end linear protection domain having a high priority, because of congestion that may occur in a pre-emption process of stopping use of a shared protection segment of a working path that is included in a end-to-end linear protection domain having a low priority, a signal failure occurs at a protection path, and thus operation of a shared mesh protection switching protocol abnormally can be prevented. | 09-04-2014 |
20140328164 | METHOD AND APPARATUS FOR PROTECTION SWITCHING IN ROOTED MULTIPOINT (RMP) CONNECTION NETWORKS - A method of operating a root node in a multipoint-connection with a plurality of leaf nodes, the method including transmitting/receiving traffic with the plurality of leaf nodes via a working path, receiving, from a leaf node, a message indicating an occurrence of a failure on a path of the leaf node from among the plurality of leaf nodes, recognizing an occurrence of a local failure on the path connected to the leaf node, and transmitting information about the failure to the leaf node. | 11-06-2014 |
20140328165 | METHOD AND APPARATUS FOR PROTECTION SWITCHING IN ROOTED MULTIPOINT (RMP) CONNECTION NETWORKS - A method of operating a root node in which the root node transmits/receives traffic with a plurality of leaf nodes through a plurality of working paths is disclosed, the method including receiving, from a first leaf node, a first signal failure (SF) message indicating an occurrence of a failure on a first working path of the first leaf node, receiving traffic from the first leaf node by switching the first working path to a first protection path, and receiving traffic from remaining leaf nodes aside from the first leaf node while maintaining the working path. | 11-06-2014 |