Wireless access point methods and apparatus using dynamically-activated service intervals

• US 8,837,509 B2
• Filed: 05/02/2012
• Issued: 09/16/2014
• Est. Priority Date: 03/27/2009
• Status: Active Grant

• Current Assignee: Mcmaster University
• Original Assignee: Mcmaster University
• Inventors: Kholaif, Ahmad Mohammad, Koutsakis, Polychronis, Todd, Terence Douglas, Smadi, Mohammed N.
• Primary Examiner(s): Ng, Fan
• Application Number:
  US13/462,127
• Publication Number:
  US 20120213138A1
• Time in Patent Office: 867 Days
• Field of Search: 370431-463
• US Class Current: 370/431
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 88/08 Access point devices
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Techniques in a mobile communication device for communicating with a wireless access point (AP) are described. The mobile device receives from the AP data which indicate a plurality of activated service intervals in the superframe that are made available to mobile devices for communication access. The mobile device attempts to access, during the indicated activated service intervals, a radio medium via the AP. The mobile device refrains from attempting to access the radio medium via the AP during each power conservation interval provided in between the indicated activated service intervals.

Claims

1. A method operating in a mobile communication device for communicating with a wireless access point, the method comprising:

receiving, in a beacon frame from the wireless access point, data which indicate a plurality of activated service intervals in a superframe following the beacon frame that are made available to mobile devices contending for communication access, wherein each of the plurality of activated service intervals has a corresponding start time and an end time determined at the wireless access point and further wherein the number of plurality of activated service intervals is adapted to change in response to a change in a traffic requirement for the mobile devices;

attempting to access, during at least one of said indicated activated service intervals, a radio medium via the wireless access point; and

refraining from attempting to access the radio medium via the wireless access point during each power conservation interval in the superframe in between the indicated activated service intervals.

2. The method of claim 1, wherein the number of activated service intervals has a relationship with the traffic requirement such that as the traffic requirement increases, the number of activated service intervals increases.

3. The method of claim 2, further comprising:

sending to the wireless access point a traffic specification (TSPEC), for indicating changes in the traffic requirement.

4. The method of claim 1, further comprising:

attempting to access, during at least one active subinterval of said indicated activated service intervals, the radio medium via the wireless access point; and

refraining from attempting to access the radio medium via the wireless access point during at least one inactive subinterval of said indicated activated service intervals and during each power conservation interval provided in between the indicated activated service intervals.

5. The method of claim 1, wherein the data which indicate a plurality of activated service intervals comprises broadcasted identifiers of the activated service intervals that are available to the mobile devices.

6. The method of claim 1, wherein the communication access is based on Enhanced Distributed Channel Access (EDCA).

7. The method of claim 1, wherein the communication access is based on Hybrid Coordinator Function (HCF) Controlled Channel Access (HCCA).

8. The method of claim 1, which is performed by computer instructions stored in a non-transitory computer readable medium and executable on one or more processors of the mobile communication device.

9. A mobile communication device, comprising:

one or more processors; and

a wireless transceiver coupled to the one or more processors;

the one or more processors being configured to;

receive, in a beacon frame from a wireless access point, data which indicate a plurality of activated service intervals of a superframe following the beacon frame that are made available to mobile devices contending for communication access, wherein each of the plurality of activated service intervals has a corresponding start time and an end time determined at the wireless access point and further wherein the number of plurality of activated service intervals is adapted to change in response to a change in a traffic requirement for the mobile devices;

attempt to access, during at least one of said indicated activated service intervals, a radio medium via the wireless access point; and

refrain from attempting to access the radio medium via the wireless access point during each power conservation interval in the superframe in between the indicated activated service intervals.

10. The mobile communication device of claim 9, wherein the activated service intervals comprise dynamically-activated service intervals.

11. The mobile communication device of claim 9, wherein the number of activated service intervals has a relationship with the traffic requirement such that as the traffic requirement increases, the number of activated service intervals increases.

12. The mobile communication device of claim 11, wherein the one or more processors are further configured to:

send to the wireless access point a traffic specification (TSPEC) for indicating changes in the traffic requirement.

13. The mobile communication device of claim 9, wherein the one or more processors are further configured to:

attempt to access, during at least one active subinterval of said indicated activated service intervals, the radio medium via the wireless access point; and

refrain from attempting to access the radio medium via the wireless access point during at least one inactive subinterval of said indicated activated service intervals and during each power conservation interval provided in between the indicated activated service intervals.

14. The mobile communication device of claim 9, wherein the data which indicate a plurality of activated service intervals comprises broadcasted identifiers of the activated service intervals that are available to the mobile devices for the communication access.