| Patent application number | Description | Published |
|---|
| 20090003216 | Multipath Forwarding Algorithms Using Network Coding - A method of transmitting data across a wireless mesh network is described which uses network coding at each of the intermediate nodes between the source node and the destination node. Each intermediate node also controls the rate at which it broadcasts packets based on link congestion and the backlog of packets at each of the possible next-hop nodes for the data flow. | 01-01-2009 |
| 20090122700 | Spectrum and medium access allocation for fairness - Each node or link of an ad hoc network assists in the distributed allocation of a data channel to increase fairness, even in a multi-hop network, by tracking a measure of link weight for itself and sharing this information over a control channel with neighboring nodes. The metric can be provided over a dedicated control channel, added as a header to data communication on a data channel, or inferred by monitoring data traffic from the neighboring node. The link weight can be adjusted by a link quality factor based on provided or inferred metrics such as transmission rates, ratio of transmission errors, idle time, etc. For multiple flow queues at a subject node, one with a higher transmission rate can be selected for increased fairness. When a packet is received, medium access includes allocating bandwidth, including bonding multiple frequencies that are determined to be available to both nodes. | 05-14-2009 |
| 20090124205 | PHYSICAL AND MAC ADAPTATION FOR INTERFERENCE MITIGATION WITH COGNITIVE RADIO - A communication device cognitively monitors interference signals across a communication band so that adaptations for physical and medium access control (MAC) of data packet transmissions are appropriate for a particular interference signal. Characteristics of an interference signal of interest (e.g., bandwidth, power and/or duration relative to an average data packet transmitted over a communication channel of the communication device) are sensed for an appropriate adaptation (e.g., forward error correction, modulation technique, back off, request to send/clear to send protocol, etc.). Patterns for known types of interference sources can be compared so that when recognized an associated adaptation can be used. | 05-14-2009 |
| 20100027424 | Path Estimation in a Wireless Mesh Network - Methods and algorithms for path estimation in a wireless mesh network are described. In an embodiment, each node calculates its cost for a packet flow based on the back-log at the node and the cost of downstream neighbor nodes for the flow. The cost is communicated to the upstream neighbor nodes for the flow. When a node has an opportunity to transmit a packet, a flow is selected by the node based on the back-log at the node and the costs received from each of the downstream neighbor nodes. These costs are then also used to select a downstream neighbor node is selected based on the costs received from each of the downstream neighbor nodes. A packet re-ordering algorithm is also described which intercepts packets received at a node and delays delivery of the packet to the IP layer if an earlier packet in the sequence of packets has not been received. | 02-04-2010 |
| 20100232324 | Full-Duplex Wireless Communications - Full-duplex wireless communication is described. In an embodiment, a transceiver device having a transmitter circuit and a receiver circuit receives a data packet sent over a shared communication medium. In the embodiment, the transceiver reads the header of the data packet and starts transmitting an output signal on the same shared communication medium. Embodiments are described in which, whilst the transmission of the output signal is ongoing, the transceiver receives an impaired data signal which is made up of the payload of the data packet and interference from the output signal. In the embodiment, a cancellation signal is derived from the output signal, and this is combined with the impaired data signal to remove the interference and recover the payload of the data packet. | 09-16-2010 |
