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

• US 8,194,576 B2
• Filed: 03/27/2009
• Issued: 06/05/2012
• Est. Priority Date: 03/27/2009
• Status: Active Grant

• Current Assignee: Mcmaster University
• Original Assignee: Blackberry Limited
• Inventors: Kholaif, Ahmad Mohammad, Koutsakis, Polychronis, Todd, Terence Douglas, Smadi, Mohammed N.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Ng, Fan
• Application Number:
  US12/412,591
• Publication Number:
  US 20100246460A1
• Time in Patent Office: 1,166 Days
• Field of Search: 370310-340, 370431-463
• US Class Current: 370/310
• 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

Methods and apparatus for controlling a wireless access point (AP) (e.g. a battery-powered wireless AP) for reduced power consumption are provided. In one illustrative example, the AP is adapted to provide communication access for end stations in one or more activated service intervals of each superframe. During operation, the AP changes the number of activated service intervals that are available to end stations for the communication access, as well as the durations of their active subinterval durations, in accordance with a change in traffic requirements. The AP regularly broadcasts data which indicates the activated service intervals that are made available to the mobile devices. A wireless transceiver of the AP is enabled during each activated service interval made available to the mobile devices, but the AP is placed in a power conservation mode during each deactivated service interval provided in between the activated service intervals. The AP may also be placed in the power conservation mode during inactive subintervals of each activated service interval.

Claims

1. A method for use in controlling a wireless access point configured to provide contention-based communication access for communication devices during a plurality of dynamically-activated service intervals in each one of a plurality of superframes, the method comprising:

in response to a change in a traffic requirement for communication devices operating via the wireless access point;

changing, in accordance with the change in the traffic requirement, the number of activated service intervals in the superframe that are available to the communication devices for the contention-based communication access;

transmitting, to the communication devices, data which identify the activated service intervals in the superframe that are made available to the communication devices for the contention-based communication access;

causing a wireless transceiver of the wireless access point to be enabled for the contention-based communication access during each said activated service interval; and

causing the wireless access point to be placed into a power conservation mode during each power conservation interval provided in between said 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 service intervals increase.

3. The method of claim 1, further comprising:

causing the wireless transceiver to be enabled for the contention-based communication access during an active subinterval of said activated service interval; and

causing the wireless transceiver to be placed into the power conservation mode during an inactive subinterval of said activated service interval.

4. The method of claim 1, further comprising:

in response to the change in traffic requirement;

changing, in accordance with the change in the traffic requirement, the duration of at least one active subinterval of an activated service interval for the contention-based communication access, the duration having a relationship with the traffic requirement such that as the traffic requirement increases, the duration of the at least one service interval increases.

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

6. The method of claim 1, wherein the act of transmitting comprises the further act of broadcasting identifiers of the activated service intervals that are available to the communication devices for the contention-based communication access.

7. The method of claim 1, wherein the act of transmitting comprises the further act of broadcasting data indicative of boundaries or durations of the activated service intervals that are available to the communication devices for the contention-based communication access.

8. The method of claim 1, further comprising:

receiving, from one of the communication devices, a traffic specification (TSPEC); and

identifying the change in the traffic requirement based on data in the traffic specification.

9. The method of claim 1, further comprising:

receiving, from one of the communication devices, a request for communications; and

assigning one or more service intervals exclusively for the communications of the communication device.

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

11. 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 wireless access point.

12. A wireless access point, comprising:

at least one wireless transceiver;

an antenna coupled to the at least one wireless transceiver;

one or more processors coupled to the at least one wireless transceiver;

the one or more processors being configured to operate with the wireless transceiver to;

provide contention-based communication access for communication devices in a plurality of dynamically-activated service intervals in each one of a plurality of superframes;

in response to a change in a traffic requirement for the communication devices operating via the wireless access point;

change, in accordance with the change in the traffic requirement, the number of said activated service intervals in the superframe that are available to the communication devices for the contention-based communication access;

broadcast, to the communication devices, data which identify the activated service intervals in the superframe that are made available to the communication devices for the contention-based communication access;

causing the wireless transceiver to be enabled for the contention-based communication access during each said activated service interval; and

causing the wireless access point to be placed into a power conservation mode during each power conservation interval provided in between said activated service intervals.

13. The wireless access point of claim 12, wherein the number of activated service intervals has a relationship with the traffic requirement such that as the traffic requirement increases, the number of service intervals increase.

14. The wireless access point of claim 12, wherein the one or more processors are further configured to:

in response to the change in traffic requirement;

change, in accordance with the change in the traffic requirement, the duration of at least one active subinterval of an activated service interval for the contention-based communication access, the duration having a relationship with the traffic requirement such that as the traffic requirement increases, the duration of the at least one service interval increases.

15. The wireless access point of claim 12, wherein the one or more processors are further configured to broadcast identifiers of the service intervals that are available to the communication devices for the contention-based communication access.

16. The wireless access point of claim 12, wherein the one or more processors are further configured to broadcast data indicative of boundaries or durations of the activated service intervals that are available to the mobile devices for the contention-based communication access.

17. The wireless access point of claim 12, wherein the one or more processors are further configured to:

receive, from one of the communication devices, a traffic specification; and

identify the change in the traffic requirement based on data in the traffic specification.

18. The wireless access point of claim 12, further comprising:

a battery power interface configured for coupling to a battery power source for supplying electrical power to electrical components of the wireless access point, the electrical components including the wireless transceiver and the one or more processors.

19. The wireless access point of claim 12, which is further configured to connect with and be part of a wireless local area network (WLAN) and operates in accordance with IEEE 802.11.