Pre-scan for wireless channel selection

• US 8,411,616 B2
• Filed: 11/03/2006
• Issued: 04/02/2013
• Est. Priority Date: 11/03/2005
• Status: Active Grant

• Current Assignee: Xenogenic Development Limited Liability Company (Intellectual Ventures LLC)
• Original Assignee: Piccata Fund Limited Liability Company (Intellectual Ventures LLC)
• Inventors: Yuen, Michael
• Primary Examiner(s): Prez-Gutirrez, Rafael
• Assistant Examiner(s): VIANA DI PRISCO, GERMAN
• Application Number:
  US11/556,249
• Publication Number:
  US 20070097940A1
• Time in Patent Office: 2,342 Days
• Field of Search: None
• US Class Current: 370/328
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A system and method for pre-scanning for a wireless channel selection is provided. The methodology is executed by a first fixed location wireless device to improve initial channel selection in a wireless network where a plurality of fixed location wireless devices is contemporaneously initialized. On a predetermined channel, there is a transmission of at least one message including an identifier of the first device. On the predetermined channel, there is a transmission of at least one message indicative of readiness to transition to a subsequent processing step. The methodology also commences scanning for channel selection purposes.

Claims

1. A method executed by a first fixed location wireless device for improving initial channel selection in a wireless network where a plurality of fixed location wireless devices are contemporaneously initialized, comprising the steps of:

transmitting, on a predetermined channel, at least one message including an identifier of the first device;

transmitting, on the predetermined channel, at least one message indicative of readiness to transition to a subsequent step, wherein transmitting at least one message indicative of readiness to transition to a subsequent step is not executed until (a) a minimum number of messages are received from each identified device, and (b) a predetermined minimum amount of time has elapsed, and further including;

delaying transition to commencing scanning by a time indicated by a countdown timer;

transmitting, on the predetermined channel, an indication of countdown timer state; and

receiving messages including device identifiers from other fixed location wireless devices; and

commencing scanning for channel selection purposes after the message including the identifier of the first device and the message indicative of readiness have been transmitted.

2. The method of claim 1 wherein delaying transition to commencing scanning by a time indicated by a countdown timer is executed immediately if either (a) a predetermined maximum amount of time has elapsed, or (b) another fixed location wireless device has started a countdown timer to commencing scanning.

3. The method of claim 1 wherein, following transmitting the at least one message indicative of readiness to transition to a subsequent step, delaying transition to commencing scanning by a time indicated by a countdown timer is executed immediately if either (a) each identified device indicates readiness to begin a countdown timer to commencing scanning, or (b) a predetermined maximum amount of time has elapsed, or (c) another fixed location wireless device has started a countdown timer to commencing scanning.

4. The method of claim 1 including the further step of adopting, as countdown timer state, a countdown timer state indicative of greatest amount of time remaining to transition to commencing scanning from countdown timer state advertisements from all detected fixed location wireless devices.

5. A first fixed location wireless device operable to facilitate initial channel selection in a wireless network where a plurality of fixed location wireless devices are contemporaneously initialized, comprising:

a countdown timer for delaying transition to commencing scanning by a time indicated by the countdown timer;

a transmitter operable to transmit, on a predetermined channel;

at least one message including an identifier of the first device,

an indication of countdown timer state, and

at least one message indicative of readiness to transition to a subsequent step, wherein the transmitter does not transmit the at least one message indicative of readiness to transition to a subsequent step until (a) a minimum number of messages are received from each identified device, and (b) a predetermined minimum amount of time has elapsed; and

a receiver operable to receive messages including device identifiers from other fixed location wireless devices, and commence scanning for channel selection purposes after the message including the identifier of the first device and the message indicative of readiness have been transmitted.

6. The device of claim 5 further including circuitry operable to trigger commencement of the subsequent step if either (a) a predetermined maximum amount of time has elapsed, or (b) another fixed location wireless device has started a countdown timer to commencing scanning.

7. The device of claim 5 further including circuitry operable following transmission of the at least one message indicative of readiness to transition to a subsequent step, to trigger commencement of the subsequent step if either if either (a) each identified device indicates readiness to begin a countdown timer to commencing scanning, or (b) a predetermined maximum amount of time has elapsed, or (c) another fixed location wireless device has started a countdown timer to commencing scanning.

8. The device of claim 5 further including circuitry operable to update the countdown timer state to be a countdown timer state indicative of greatest amount of time remaining to transition to commencing scanning from countdown timer state advertisements from all detected fixed location wireless devices.