Probe response determination

• US 7,580,393 B2
• Filed: 10/02/2006
• Issued: 08/25/2009
• Est. Priority Date: 10/02/2006
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited (Hitachi, Ltd.)
• Original Assignee: Tropos Networks Incorporated (ABB Limited)
• Inventors: Arutyunov, Roman M., Wang, Huizhao
• Primary Examiner(s): Vu; Huy D.
• Assistant Examiner(s): Digiovanni; Michael J
• Application Number:
  US11/541,815
• Publication Number:
  US 20080080387A1
• Time in Patent Office: 1,058 Days
• Field of Search: 370/338, 370/331
• US Class Current: 370/332
• CPC Class Codes: H04L 43/0852 Delays
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 28/18 Negotiating wireless communication parameters
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

An apparatus and method of a method of an access point determining whether to transmit a response to a client device probe request is disclosed. The method includes the access point receiving a probe request from a client device. The access point determines a quality of a link between the access point and the client device based on the probe request. The access point sets a delay time for transmitting a probe response to the probe request depending upon the quality of the link.

Claims

1. A method of an access point determining whether to transmit a response to a client device probe request, comprising:

the access point receiving a probe request from a client device;

the access point determining a quality of a link between the access point and the client device based on the probe request;

the access point setting a delay time for transmitting a probe response to the probe request depending upon the quality of the link;

the access point transmitting the response to the probe request, if the access point does receive a probe response to the client device from another access point within the delay time, and the quality of the link between the access point and the client device is better than a link quality between the other access point and the client device.

2. The method of claim 1, further comprising including an indicator of the quality of the link between the access point and the client device within the probe response.

3. The method of claim 2, wherein the indicator comprises a receive signal strength of the probe request from the client device.

4. The method of claim 3, wherein the indicator further comprises a network quality parameter of the access point.

5. The method of claim 3, wherein the indicator includes the received signal strength modified according to the network quality parameter.

6. A method of determining which of a plurality of access points has a highest quality link with a client device, comprising:

at least one of the plurality of access points receiving a probe request from the client device;

each access point that receives the probe request, estimating a link quality between the access point and the client device;

each access point that receives the probe request, delaying a probe response depending upon the link quality between the access point and the client device;

each access node transmitting the response to the probe request, if the access node does receive a probe response to the client device from another access node within the delay time, and the quality of the link between the access node and the client device is better than a link quality between the other access node and the client device.

7. The method of claim 6, wherein the link quality is estimated by a received signal received signal strength at the access point.

8. The method of claim 6, further comprising the link quality being influenced by a network quality parameter of the access point.

9. A method of an access node within a wireless mesh network determining whether to transmit a response to a client device probe request, comprising:

the access node receiving a probe request from a client device;

the access node determining a quality of a link between the access node and the client device based on the probe request;

the access point setting a delay time for transmitting a probe response to the probe request depending upon the quality of the link;

wherein the probe response includes the quality of the link;

the access node transmitting the response to the probe request, if the access node does receive a probe response to the client device from another access node within the delay time, and the quality of the link between the access node and the client device is better than a link quality between the other access node and the client device.

10. The method of claim 9, wherein determining a quality of the link between the access node and the client device based on the probe request comprises measuring received signal strength of the probe request.

11. The method of claim 10, wherein determining a quality of the link between the access node and the client device further includes a network quality parameter of the access node.

12. The method of claim 11, wherein the network quality parameter of the access node include at least one of a path quality of the access node to a wireless mesh network gateway, a latency of the access node, a backhaul bandwidth of the access node.

13. The method of claim 11 wherein the network quality parameter comprises a quality of a routing path of the access node to a default gateway of the access node.

14. The method of claim 13, wherein the quality of the routing path is determined by a persistence of routing beacons originating at the default gateway.

15. The method of claim 9, wherein determining a quality of the link between the access node and the client device based on the probe request comprises measuring received signal strength of the probe request.

16. The method of claim 15, wherein determining a quality of the link between the access node and the client device further includes a network quality parameter of the access node, wherein the network quality parameter of the access node include at least one of a path quality of the access node to a wireless mesh network gateway, a latency of the access node, a backhaul bandwidth of the access node.