Granted Patent B2

US 8,036,186 · App. 11/493,737 · Granted Oct 11, 2011

Abstract

Claims (23)

1. A method of adaptively setting a transmission power level of a node within a wireless mesh network, the wireless mesh network comprising a gateway and a plurality of wireless access nodes, comprising:

monitoring a quality of a plurality of reverse direction links between the node and a plurality of downstream nodes, and between the node and an upstream node, of the wireless mesh network, wherein the reverse direction links are directed away from the node, wherein the quality of the plurality of reverse direction links is determined at each of the plurality of downstream nodes and the upstream node, and transmitted back to node, wherein the upstream node comprises the gateway or an upstream access node located in a routing path between the node and the gateway, and the node is located in a routing path between the downstream nodes and the gateway;

identifying a worst quality reverse direction link based on the monitoring of the quality of the plurality of reverse direction links;

if the worst quality link is greater than a high threshold, then decreasing the transmission power level of the node;

if the worst quality link is less than a low threshold, then increasing the transmission power level of the node.

2. The method of claim 1 , further comprising:

if the worst quality link is greater than the high threshold, then increasing the transmission data rate of the node.

3. The method of claim 1 , further comprising:

if the worst quality link is less than the low threshold, then decreasing the transmission data rate of the node.

4. The method of claim 1 , wherein the monitoring of the quality of the reverse direction links is performed periodically.

5. The method of claim 1 , wherein the monitoring of the quality of the reverse direction links is performed if neighboring nodes communicate a level of interference above an interference threshold.

6. The method of claim 1 , wherein the monitoring of the quality of the reverse direction links is performed if downstream nodes indicate a lack of received signal strength.

7. The method of claim 1 , wherein the quality of the reverse direction links is determined by a persistence of routing packets transmitted by the node that are successfully received by each of the neighboring nodes.

8. The method of claim 7 , wherein each neighboring nodes transmits the persistence of the routing packets received by each neighboring node back to the node.

9. The method of claim 1 , wherein the node is an access node of the wireless mesh network.

10. The method of claim 1 , further comprising setting the transmission power level to a maximum level and the transmission data rate to a minimum level when the node is performing frequency channel scanning.

11. The method of claim 1 , further comprising setting the transmission power level to a maximum level and the transmission data rate to a minimum level when the node receives notice from a neighboring node, that the neighboring node is performing frequency channel scanning.

12. A wireless mesh network comprising:

a plurality of gateways and a plurality of access nodes;

means for monitoring a quality of a plurality of reverse direction links between each access node and each of a plurality of downstream nodes of each access node, and between each access node and an upstream node of each access node, wherein the upstream node comprises a one of the plurality of gateways or an upstream access node located in a routing path between the node and the one of the plurality of gateways, and the node is located in a routing path between the downstream nodes and the gateway;

means for identifying a worst quality reverse direction link;

for each access node, if the worst quality link is greater than a high threshold, then decreasing the transmission power level of the access node;

for each access node, if the worst quality link is less than a low threshold, then increasing the transmission power level of the access node.

Assignments (9)