Time Management in a Wireless Access Point

• US 20070041353A1
• Filed: 08/15/2006
• Published: 02/22/2007
• Est. Priority Date: 08/18/2005
• Status: Abandoned Application

• Current Assignee: Mcmaster University
• Original Assignee: Mcmaster University
• Inventors: Zhao, Dongmei, Todd, Terence, Li, Yangyang
• Application Number:
  US11/464,535
• Publication Number:
  US 20070041353A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements

Abstract

Indications of one or more future unavailability time intervals are transmitted in a management frame by an access point to one or more wireless client devices associated therewith. During the unavailability time intervals, the access point is not available to receive unsolicited communication from the wireless client devices.

Claims

1. A method for time management in a wireless access point, the method comprising:

transmitting a management frame having incorporated therein indications of one or more future unavailability time intervals during which said access point is not available to receive unsolicited communication from wireless client devices that are associated with said access point in a wireless network.

2. The method of claim 1, further comprising:

controlling circuitry in said access point to be in a power-saving state during at least a part of said one or more unavailability time intervals.

3. The method of claim 1, further comprising:

communicating data on behalf of one or more of said wireless client devices during at least a part of said one or more unavailability time intervals.

4. The method of claim 1, wherein said indications are defined with reference to an event of said wireless network.

5. The method of claim 4, wherein said event is a beginning of a contention-free interval.

6. The method of claim 4, wherein said event is an end of transmission of a beacon frame that contains a Delivery Traffic Indication Map.

7. The method of claim 4, wherein said event recurs and one or more of said indications are fixed indications that are applicable with reference to recurrences of said event.

8. The method of claim 4, wherein said event recurs and one or more of said indications are movable indications that are applicable with reference to a single occurrence of said event.

9. The method of claim 8, further comprising:

monitoring usage of traffic-carrying capacity previously offered by said access point to said wireless client devices; and

based at least in part on said usage, setting said movable indications in order to decrease, maintain or increase traffic-carrying capacity offered by said access point to said wireless client devices during a period of time that includes said future unavailability time intervals.

10. The method of claim 1, further comprising:

determining, based at least in part on quality of service requirements of traffic to be supported by said access point, one or more of the number, rate and duration of said one or more unavailability time intervals.

11. The method of claim 1, wherein said indications include one or both of beginning times and end times of said unavailability time intervals.

12. A method for time management in a wireless client device, the method comprising:

receiving a management frame from an access point associated with said client device in a wireless network, said management frame incorporating indications of one or more future unavailability time intervals during which said access point will not be available to receive unsolicited communication from said client device; and

not transmitting unsolicited communication to said access point during said one or more future unavailability time intervals.

13. The method of claim 12, further comprising:

entering a power-saving state during at least a part of said one or more unavailability time intervals.

14. The method of claim 13, wherein said indications are defined with reference to a recurring event of said network, the method further comprising:

exiting said power-saving state for a start of a particular time interval following a recurrence of said event if said client device is certain that said access point will be available to receive unsolicited communication from said client device during said particular time interval; and

otherwise, exiting said power-saving state to receive another management frame having incorporated therein further indications of another one or more unavailability time intervals, wherein at least one of said further indications is defined with reference to a single occurrence of said event.

15. A wireless access point comprising:

a wireless communication interface;

a processor coupled to said wireless communication interface;

memory to store code which, when executed by said processor, results in transmission via said wireless communication interface of a management frame having incorporated therein indications of one or more future unavailability time intervals during which said access point is not available to receive unsolicited communication from wireless client devices that are associated with said access point in a wireless network.

16. The wireless access point of claim 15, wherein said code, when executed by said processor, further results in:

controlling circuitry in said access point to be in a power-saving state during at least a part of said one or more unavailability time intervals.

17. The wireless access point of claim 15, wherein said code, when executed by said processor, further results in:

communicating data on behalf of one or more of said wireless client devices during at least a part of said one or more unavailability time intervals.

18. A wireless device comprising:

a wireless communication interface to receive a management frame from an access point associated with said device, said management frame having incorporated therein indications of one or more future unavailability time intervals during which said access point will not be available to receive unsolicited communication from said device;

a processor coupled to said wireless communication interface;

memory to store code which, when executed by said processor, prevents said wireless device from transmitting unsolicited communication to said access point during said one or more future unavailability time intervals.

19. The wireless device of claim 18, wherein said code, when executed by said processor, further results in:

controlling circuitry in said device to be in a power-saving state during at least a part of said one or more unavailability time intervals.

20. The wireless device of claim 19, wherein said code, when executed by said processor, further results in:

exiting said power-saving state for a start of a particular time interval following a recurrence of said event if said client device is certain that said access point will be available to receive unsolicited communication from said client device during said particular time interval; and

otherwise, exiting said power-saving state to receive via said wireless communication interface another management frame having incorporated therein further indications of another one or more unavailability time intervals, wherein at least one of said further indications is defined with reference to a single occurrence of said event.