MULTI-HOP WIRELESS NETWORKS

• US 20130272166A1
• Filed: 06/11/2013
• Published: 10/17/2013
• Est. Priority Date: 12/16/2008
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Ji, Lusheng, Han, Bo, Miller, Robert R. II
• Granted Patent: US 9,042,260 B2
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/38 Flow based routing
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 47/2408 for supporting different services, e.g. a differentiated services [DiffServ] type of service
• CPC Class Codes: H04L 47/286 Time to live
• CPC Class Codes: H04W 28/02 Traffic management, e.g. flow control or congestion control
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A path configuration message is sent to nodes in a multi-hop network along a path between a source node and destination nodes. The path configuration message includes path information and one or more special channel access parameters associated with the path information. The path configuration message temporarily changes the channel access priority for packets matching the path information in the special message. The nodes along the path therefore have higher channel access priority relative to other nearby nodes and other traffic flows. At the end of the a length of a time determined by a time to live parameter in the special message, the nodes resume using default channel access parameters in place of the special channel access parameters for packets matching the path information.

Claims

1. A method comprising:

receiving a path configuration message at one or more nodes in a multi-hop network, the path configuration message including path information, one or more channel access parameters associated with the path information, and a time to live parameter specifying a length of time that the one or more channel access parameters are valid;

transmitting from the one or more nodes that received the path configuration message, any traffic matching the path information, using the one or more channel access parameters; and

the one or more nodes discarding the one or more channel access parameters in response to expiration of the length of time and resuming using default channel access parameters in place of the one or more channel access parameters.

2. The method as recited in claim 1 wherein the one or more channel access parameters cause the traffic matching the path information to be forwarded by the one or more nodes to have increased channel access priority.

3. The method as recited in claim 1 further comprising:

sending the path configuration message to nodes along a path from a source node to a destination node in the multi-hop network.

4. The method as recited in claim 1 wherein the path information includes a source node and a destination node.

5. The method as recited in claim 4 wherein the one or more channel access parameters are applied to traffic going in both directions between the source node and the destination node.

6. The method as recited in claim 4 wherein the path information further specifies a port number and traffic has to match the port number and the source and destination nodes to be transmitted from the one or more nodes using the one or more channel access parameters.

7. The method as recited in claim 1 wherein the one or more channel access parameters include one or more collision avoidance parameters.

8. The method as recited in claim 1 further comprising:

transmitting a default path configuration message to the one or more nodes in the multi-hop network to adjust the default channel access parameters in the nodes.

9. The method as recited in claim 8 further comprising:

utilizing the adjusted default channel access parameters for a second time period specified in a second time to live parameter in the default path configuration; and

responsive to the end of the second time period using the default channel access parameters.

10. A method comprising:

transmitting a first path configuration message to a plurality of nodes in a multi-hop wireless network, the first path configuration message including path information and one or more channel access parameters associated with the path information, the path configuration message including a time to live parameter specifying how long the one or more channel access parameters are valid; and

recalling the first path configuration message by transmitting a second path configuration message to the plurality of nodes, the second path configuration message including the path information and a time to live parameter having a predetermined value.

11. The method as recited in claim 10 wherein the predetermined value is zero.

12. The method as recited in claim 10 further comprising transmitting the path configuration message along a path from a source node to a destination node in the multi-hop network corresponding to the path information, the one or more channel access parameters increasing the channel access priority for traffic being transmitted along the path from the source node to the destination node before recalling the path configuration message.

13. The method as recited in claim 12 wherein the path information specifies packets going in both directions between the source node and destination node and the one or more channel access parameters are applied to information going in both directions.

14. A wireless node comprising:

a transmitter and receiver;

the wireless node responsive to receipt by the receiver of a path configuration message including path information and one or more channel access parameters associated with the path information, to record the path information and the one or more channel access parameters; and

the wireless node further responsive to transmit via the transmitter, packets with matching path information according to the one or more channel access parameters and to transmit other packets not matching the path information with default channel access parameters;

wherein the one or more channel access parameters provide increased channel access priority for packets matching the path information as compared to the default channel access priorities;

wherein the wireless node is further responsive to a time to live parameter in the path configuration message to resume using the default channel access parameters in place of the one or more channel access parameters after a length of time specified in the time to live parameter has elapsed.

15. The wireless node as recited in claim 14 wherein the path information includes at least one of a source identifier and a destination identifier.

16. The wireless node as recited in claim 15 wherein the path information further specifies a port number and packets have to match the port number and the source and destination identifiers in order be transmitted from the wireless node using the one or more channel access parameters.

19. The wireless node as recited in claim 14 wherein the path information specifies packets going in both directions between a source node and a destination node and the wireless node is responsive to the path information to transmit packets using the one or more channel access parameters in both directions.

20. The wireless node as recited in claim 14 further responsive to a second path configuration message including the path information and a time to live value of zero to revert to the default channel access parameters.

17. The wireless node as recited in 14 further responsive to a received default path configuration message to adjust default channel access parameters in accordance with the default path configuration message.

18. The wireless node as recited in claim 17 wherein the wireless node is responsive to a time to live parameter in the default path configuration message to revert back to previous default channel access parameters after a time period determined by the time to live parameter in the default path configuration message has expired.