| Patent application number | Description | Published |
|---|
| 20090067354 | Apparatus and Method for Controlling Channel Switching in Wireless Networks - The invention provides apparatus methods for avoiding channel collisions in Wireless Regional Area Networks (WRAN), A medium access controller (MAC) for switching a base station (BS) of a WRAN from a first channel to a second channel at a time t is provided. The MAC includes a switch time delay circuit for delaying said switching with respect to time t by a random delay time. | 03-12-2009 |
| 20090135824 | Route Selection in Wireless Networks - A system and method for discovering a route between a source node and a destination node in a wireless network including setting an intermediate reply flag of a route request message by the source node, flooding the wireless network with the route request message and responding to the route request message with route reply message by a first intermediate node having a valid route to the destination node, are described. Also described are a system and method for discovering a best route in which case the route reply message becomes a first route reply message. The system and method for discovering a best route includes selecting by the destination on the best route between itself and the source node based on cumulative metrics received in route request messages received by the destination node, creating a further route reply message and unicasting the further route reply message to the source node. | 05-28-2009 |
| 20090147718 | Method and Apparatus for Reliably Delivering Multicast Data - A method and apparatus are described including mapping a multicast connection to a unicast uniform resource identifier, establishing a state for a multicast-to-unicast conversion, allocating ports, receiving multicast addressed data packets and converting the multicast addressed data packets to unicast addressed data the packets. | 06-11-2009 |
| 20090161774 | Apparatus and Method for Dynamic Frequency Selection in ofdm Networks - A wireless endpoint is a Wireless Regional Area Network (WRAN) endpoint, such as a base station (BS) or customer premise equipment (CPE). The WRAN endpoint can transmit an orthogonal frequency division multiplexed (OFDM) signal comprising 2048 subcarriers in a channel. The 2048 subcarriers are divided into 16 subcarrier sets, or subchannels, each subcarrier set comprising 128 subcarriers. However, upon detection of an incumbent narrowband signal in the channel, the WRAN endpoint forms the OFDM signal for transmission in such a way that the WRAN endpoint excludes use of those one, or more, of the subcarrier sets that would interfere with the incumbent narrowband signal. | 06-25-2009 |
| 20090219990 | Cross-Layer Optimization for Scalable Video Multicast over IEEE 802.11 Wireless Local Area Networks - A system and method for transmitting video signals to a plurality of receivers in a multicast session, including controlling and adapting coding, transmission and protection schemes of a plurality of layers of a network protocol stack are described. | 09-03-2009 |
| 20090252096 | Apparatus and Method for Dynamic Frequency Selection in Wireless Networks - A wireless endpoint is a Wireless Regional Area Network (WRAN) endpoint, such as a base station (BS) or customer premise equipment (CPE). The WRAN endpoint can transmit an orthogonal frequency division multiplexed (OFDM) signal comprising 2048 subcarriers in a channel. The 2048 subcarriers are divided into 16 subcarrier sets, or subchannels, each subcarrier set comprising 128 subcarriers. However, upon detection of an incumbent narrowband signal in the channel, the WRAN endpoint forms a frequency usage map for transmission to another WRAN endpoint, wherein the frequency usage map identifies one, or more, of the subcarrier sets that would interfere with the incumbent narrowband signal. | 10-08-2009 |
| 20090276686 | METHOD TO SUPPORT FORWARD ERROR CORRECTION FOR REAL-TIME AUDIO AND VIDEO DATA OVER INTERNET PROTOCOL NETWORKS - A method and apparatus are described for protecting real time media including receiving media packets, generating media bit strings from the media packets, applying a forward error correcting code across the generated media bit strings to generate at least one forward error correcting bit string and generating at least one forward error correcting packet from the at least one forward error correcting bit string. Also described are a method and apparatus for recovering from losses of real time media packets including forming media bit strings from received media packets, forming forward error correcting bit strings from received forward error correcting packets, decoding the formed media bit strings and forward error correcting bit strings to obtain recovered media bit strings and recover lost media packets from the recovered media bit strings. Further described is a data structure for a forward error correcting header on computer readable media. | 11-05-2009 |
| 20090286565 | Apparatus and Method for Transmit Power Control Frequency Selection in Wireless Networks - A wireless endpoint is a Wireless Regional Area Network (WRAN) endpoint, such as a base station (BS) or customer premise equipment (CPE). The WRAN endpoint performs channel sensing to determine which channels are available for use and begins transmission on an available channel. Upon detection of a TV broadcast on an adjacent channel, the WRAN endpoint adjusts a power level of its transmitted signal. | 11-19-2009 |
| 20090303902 | Multicast mesh routing protocol - A method for a node to select a route to join a multicast group in a wireless mesh network, including establishing the route between the node and the multicast group using media access control addresses is described. A method for determining a multicast group leader of the multicast group of a wireless mesh network using media access control addresses is also described. | 12-10-2009 |
| 20090319824 | DATA RECOVERY IN HETEROGENEOUS NETWORKS USING PEER'S COOPERATIVE NETWORKING - A method and apparatus for recovering data, comprising establishing a secondary recovery network with a device, detecting data loss and recovering via the secondary recovery network the lost data from the device, the device having correctly received the data, are described. The lost data was sent in a primary wireless multicast network. A method and apparatus for recovering data, comprising receiving data, establishing a secondary recovery network with device and recovering the lost data via said secondary recovery network, are also described. The received data was sent in a primary wireless multicast network. | 12-24-2009 |
| 20090319845 | Seamless Handover of Multicast Sessions in Internet Protocol Based Wireless Networks Using Staggercasting - A method and apparatus are described for recovering from loss of an original data packet, including detecting data packet loss, joining a delayed multicast group, receiving a delayed data packet and using the delayed data packet to recover the original data packet that was lost. The delayed data packet is one of a copy of the original data packet, a copy of the original data packet encoded at a lower bit rate or a parity packet. Also described are a method and apparatus for staggercasting including encoding and compressing a first data sequence, packetizing the compressed encoded data sequence to form a data packet, multicasting the data packet to a first multicast group, encoding and compressing a second data sequence, packetizing the compressed encoded second data sequence to form a packet and multicasting the packet delayed by an offset time to a second multicast group. | 12-24-2009 |
| 20090327842 | RECOVERY FROM BURST PACKET LOSS IN INTERNET PROTOCOL BASED WIRELESS NETWORKS USING STAGGERCASTING AND CROSS-PACKET FORWARD ERROR CORRECTION - A method and system for transmitting data are described including packetizing the data, performing forward error correction (FEC) encoding on the packetized data in order to generate a parity packet, appending FEC information as padding to the end of payload data of the packetized data and transmitting the packetized data and the at least one parity packet. Also described are a method and system for recovering from loss of a packet including receiving a data packet, receiving a parity packet, buffering the received data packet, detecting packet loss, forward error correction decoding the parity packet to recover from packet loss using forward error correction information extracted from the data packet and from the parity packet and forwarding the recovered packet via an internal socket. Also described is a method for staggercasting. | 12-31-2009 |
| 20100046400 | MULTICAST DISTRIBUTION TREE ESTABLISHMENT AND MAINTENANCE IN A WIRELESS MULTI-HOP RELAY COMMUNICATION SYSTEM - A method and apparatus for multicast communications in a multi-hop relay network are described including sending an extended request message, wherein the request message includes a multicast connection identification, multicast distribution tree information and a path identification and receiving an extended response message. Correspondingly, a method and apparatus for multicast communications in a multi-hop relay network are described including receiving an extended request message, wherein said request message includes a multicast connection identification, multicast distribution tree information and a path identification and sending an extended response message. | 02-25-2010 |
| 20100074194 | RADIO AND BANDWIDTH AWARE ROUTING METRIC FOR MULTI-RADIO MULTI-CHANNEL MUTLI-HOP WIRELESS NETWORKS - A method and system are described for establishing an end-to-end route for data to traverse a wireless network, including calculating a link cost function, calculating a quantized link cost function using the calculated link cost, function, calculating a quantized cost of each of a plurality, of end-to-end routes for data to traverse the wireless network, wherein the plurality of end-to-end routes include routes between a same set of nodes in the wireless network, wherein, the quantized cost of each of the plurality of end-to-end routes for data to traverse the wireless network is performed using the quantized link cost function and selecting one of the plurality of end-to-end routes, for data to traverse the wireless network based on the quantized cost of each of the plurality of end-to-end routes. Also described is a node in a wireless network configured to participate in the establishment of a bi-directional end-to-end route for data to traverse the wireless network. | 03-25-2010 |
| 20100091669 | METHOD TO SELECT ACCESS POINT AND RELAY NODE IN MULTI-HOP WIRELESS NETWORKING - A method and apparatus are described for selecting an access point in a wireless network, including initializing a channel index, recording a received signal power and information contained in one of a beacon message and a probe request response message, calculating an access link metric for each candidate access point, the access link metric being between an end device and each candidate access point on the channel indexed by the channel index responsive to the received signal power and information receiving a path metric between each candidate access point and a gateway, estimating a function using the access link metric and the path metric, selecting one of the candidate access points based on the function and establishing a connection with the selected access point. Also described is a method and apparatus for maintaining a connection with an access point. | 04-15-2010 |
| 20100092178 | Method and Apparatus for Sensing Channel Availability in Wireless Networks - A method and apparatus is provided for applying an electroding tone to a power conductor located in an undersea optical cable employed in an undersea optical transmission system having at least one repeater. The method begins by applying a DC line current to the power conductor. The DC line current has a value sufficient to power the repeater and less than a value sufficient to power the repeater and to perform electroding. An AC current is impressed on the DC line current at a prescribed frequency and a peak-to-peak amplitude ranging from zero and a prescribed value to generate the tone. The impression or application of the AC current is terminated after a period of time at least sufficient to locate the optical cable or an optical cable fault. | 04-15-2010 |
| 20100098176 | METHOD FOR EFFICIENT FEEDBACK OF RECEIVING CHANNEL CONDITIONS IN ADAPTIVE VIDEO MULTICAST AND BROADCAST SYSTEMS - A method and apparatus for providing channel condition feedback in a multicast network are described including estimating a indication of channel condition, determining a receiver class based on the estimated indication of channel condition, calculating a delay, delaying transmission of the estimated indication of channel condition for the calculated delay, receiving a report from another receiver in the determined receiver class, the report including an indication of channel condition and canceling the delay if the received indication of channel condition is one of greater than and equal to the estimated indication of channel condition. The method and apparatus further include transmitting a single report for the calculated receiver class to a server including a worst indication of channel condition for the determined receiver class. | 04-22-2010 |
| 20100172249 | Method for Determining a Route in a Wireless Mesh Network Using a Metric Based On Radio and Traffic Load - A method and apparatus for calculating a routing metric for a wireless network including retrieving configured system parameters, selecting a form of a first weight factor based on channel load/utilization and parameters of the first weight factor, selecting a form of a second weight factor based on frame/packet error rate and parameters of the second weight factor, retrieving estimated link bit rate, measuring a channel/link busy time, estimating a channel/link load, estimating a packet/frame error rate of the link and calculating the metric are described. A method and system for determining a route/path between two nodes of a wireless network including calculating a weighted radio and load aware metric by each node in the wireless network, storing the metric and using the metric to select the route/path for communication between two nodes of the wireless network based on a sum of the metrics calculated by each node of the wireless network are also described. | 07-08-2010 |
| 20100185753 | UNIFIED PEER-TO-PEER AND CACHE SYSTEM FOR CONTENT SERVICES IN WIRELESS MESH NETWORKS - A method and apparatus for receiving content over a wireless network are described, including determining a first server from which to receive a content clip to be streamed, requesting the content clip to be streamed from the selected first server, receiving the streamed content clip from the selected first server, determining a peer device from which to receive a content clip to be downloaded, requesting the content clip to be downloaded and receiving the downloaded content clip. The first server is a mesh content server. | 07-22-2010 |
| 20100226262 | Adaptive Joint Source and Channel Coding Scheme for H.264 Video Multicasting Over Wireless Networks - A method and apparatus for estimating packet loss rate are described including calculating a real packet loss rate in a time slot at the end of the time slot, estimating average packet loss rate for a subsequent time slot, estimating variance of packet loss rate for the subsequent time slot and estimating the packet loss rate for the subsequent time slot. A method and apparatus and also described for dynamically allocating available bandwidth for video multicast including selecting an intra-frame rate, determining a packet loss rate threshold, receiving user topology information, receiving channel conditions for each user, determining an optimal operation point for encoding and transmitting video frames in a subsequent time slot, adapting dynamically quantization parameters and a forward error correction code rate, encoding the video frames using the quantization parameters and applying forward error correction code with the forward error correction code rate to data packets of the video frames to generate forward error correction packets. | 09-09-2010 |
| 20100260180 | METHOD AND APPARATUS FOR ADAPTIVE FORWARD ERROR CORRECTION WITH MERGED AUTOMATIC REPEAT REQUEST FOR RELIABLE MULTICAST IN WIRELESS LOCAL AREA NETWORKS - A method and apparatus are described for increasing multicasting reliability, including receiving content and a first layer of a plurality of a forward error correction coded packets from a first multicast group and joining an additional multicast group in order to receive one of additional layers of forward error correction coded packets and the content along with a further additional layer of the plurality of forward error correction coded packets. | 10-14-2010 |
| 20100322141 | JOINT ASSOCIATION, ROUTING AND RATE ALLOCATION IN WIRELESS MULTI-HOP MESH NETWORKS - A method and apparatus are described including collecting network information, determining an association, bandwidth allocation and routing scheme based on the collected network information, notifying a mesh access point of the association, the bandwidth allocation and the routing scheme and notifying a client node of its association information. Also described are a method and apparatus including measuring link quality and channel conditions, reporting results of the measuring act to a controller, receiving a routing decision and data forwarding instructions from the controller and forwarding the routing decision and the data forwarding instructions to a client node. Further described are a method and apparatus including measuring link quality and channel conditions, reporting results of the measuring act to a controller, receiving association instructions from the centralized controller and updating previously stored association instructions with the received association instructions. | 12-23-2010 |
| 20110051651 | METHOD AND APPARATUS FOR MULTICAST TREE MANAGEMENT IN MULTI-HOP RELAY COMMUNICATION SYSTEM - A method is described including receiving multiple requests for a multicast service, generating parameters associated with binding paths to a multicast tree to provide the requested multicast service and binding the paths to the multicast tree. Also described is a method including receiving a request for multicast service with a multicast tree identification, binding the multicast tree identification to paths satisfying a quality of service level for the multicast tree identification and transmitting a first message to a multi-hop relay base station. A method is described including receiving requests to delete multicast service from client devices served by multiple paths, generating parameters associated with unbinding paths from a multicast tree to delete the multicast service and unbinding the paths from the multicast tree. Also described is a method for unbinding of paths from the perspective of the relay station. | 03-03-2011 |
| 20110064013 | COLLISION MITIGATION FOR MULTICAST TRANSMISSION IN WIRELESS LOCAL AREA NETWORKS - A method and apparatus are described including multicasting a medium reservation message, receiving responses to the medium reservation message and determining if a ratio of the received responses to an expected number of responses exceeds a threshold. Also described are a method and apparatus including receiving a medium reservation message, determining if the medium reservation message specifies this receiver in a list of receivers from which a response is requested, determining if a medium is idle and transmitting the response to the medium reservation message responsive to the second determination. | 03-17-2011 |
| 20110069628 | CONTENTION BASED MEDIUM RESERVATION FOR MULTICAST TRANSMISSION IN WIRELESS LOCAL AREA NETWORKS - A method and apparatus are described including multicasting a medium reservation message and receiving a response to the medium reservation message. Also described are a method and apparatus including receiving a medium reservation message, determining if a medium is idle and transmitting a response to the medium reservation message responsive to the determination. Further described are a method and apparatus including receiving a medium reservation message, determining if a received network allocation vector in the medium reservation message has a value greater than a current network allocation vector, determining if transmission over a medium during a time interval is detected and resetting the current network allocation vector responsive to the determination of transmission. Yet further described are a method and apparatus including receiving a response to a medium reservation message, determining if a network allocation vector in the response is greater than a current network allocation vector and updating the current network allocation vector responsive to the determination. | 03-24-2011 |
| 20110080977 | Apparatus for multicast transmissions in wireless local area networks - Message formats and apparatus are described that serve to reserve access to a communication medium in a multi-cast system. A first message, a multicast request-to-send message, includes a duration field having information representing the reserved time for a communication medium, a multicast receiver address field, a multicast transmitter address field, a field that identifies the number of slots for a clear-to-send response, and a field that identifies the number slots for a not-clear-to-send response. A second message includes a duration field, and a multicast receive address field. The second message has a format that can be used as one of a clear-to-send message in response to a multicast request-to-send message, a cancel-clear-to-send message that cancels a data transmission after the clear-to-send message is sent, and a not-clear-to-send message in response to the multicast request-to-send message. | 04-07-2011 |
| 20110083035 | CELL DEPENDENT MULTI-GROUP HYBRID AUTOMATIC REPEAT REQUEST METHOD FOR MULTICAST IN WIRELESS NETWORKS - A method and apparatus are described including determining address using an access point address and a multicast group address, transmitting a recovery request message to a recovery server to request recovery data using the address and receiving the recovery data from the recovery server. Also described are a method and apparatus including receiving a registration message, transmitting a reply to the registration message, receiving a recovery request message, transmitting recovery data responsive to the recovery request message and transmitting a message to a recovery multicast group to determine status of the recovery multicast group. | 04-07-2011 |
| 20110096710 | APPARATUS FOR REQUESTING ACKNOWLEDGEMENT AND TRANSMITTING ACKNOWLEDGEMENT OF MULTICAST DATA IN WIRELESS LOCAL AREA NETWORKS - A signal and apparatus for receiving the signal are described wherein the signal includes a duration field, a multi-cast receiver address field, a transmitter address field, a block acknowledgment request control field, a block acknowledgment request information field and an information field. Also described are a signal and apparatus for transmitting the signal wherein the signal includes a duration field, a multicast receiver address field, a transmitter address field, a block acknowledgment control field and a block acknowledgment information field. | 04-28-2011 |
| 20110096711 | APPARATUS FOR COLLISION MITIGATION OF MULTICAST TRANSMISSIONS IN WIRELESS NETWORKS - Message formats and apparatus are described that reserve access to a communication medium in a multicast system. A first message, a multicast request-to-send message, includes a duration field having information representing the reserved time for a communication medium, multicast receiver and transmitter address fields, and bits that specifies a destination that is expected to reply to the multicast digital message. The bits that specify a destination can be extended to a plurality of fields that each contain different destination identifiers. Example destination identifiers include association identifiers or media access control addresses. Alternately, the bits that specify a destination can have a first field containing an offset and a second field indicating destinations with respect to the offset. A second message includes a duration field and multicast receiver and transmitter address fields. The second message is used to cancel a data transmission resulting from a multicast request-to-send message. | 04-28-2011 |
| 20110116435 | Method and System for acknowledgement and retransmission of multicast data in wireless local area networks - A method and apparatus are described including multicasting a plurality of data units and multicasting a request for acknowledging receipt of the plurality of data units, receiving signals responsive to the request. Also described are a method and apparatus including receiving a multicast request to acknowledge receipt of data, determining if a response to the request is required, determining status of the data, preparing the response based on the determining acts and transmitting the response. | 05-19-2011 |
| 20110167291 | METHOD AND APPARATUS FOR TRANSMIT POWER CONTROL IN WIRELESS NETWORKS - A method and apparatus are described including receiving, by a transmitter, a report from an associated client, setting and using a downlink transmit power level responsive to the report for data transmissions to the associated client, determining a downlink data loss rate and adjusting the downlink transmit power level responsive to the downlink data loss rate, wherein said report includes received signal strength, client transmit power level and one of link margin and receiver sensitivity. Also described are a method and apparatus including receiving, by a receiver, a request for a report, transmitting the requested report, receiving an instruction to use an uplink transmit power level, setting and using the uplink transmit power level, determining an uplink data loss rate and adjusting the uplink transmit power level responsive to the uplink data loss rate, wherein said report includes said received signal strength, client transmit power level and one of said link margin and said receiver sensitivity. | 07-07-2011 |
