ADAPTIVE PERIODIC POWER-SAVE (PS) POLLING

• US 20100214942A1
• Filed: 02/22/2010
• Published: 08/26/2010
• Est. Priority Date: 02/25/2009
• Status: Active Grant

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: LU, Xiaolin, PEERY, Josef, XHAFA, Ariton E., DU, Shu
• Granted Patent: US 8,547,853 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0876 Network utilisation, e.g. volume of load or congestion level
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In accordance with at least some embodiments, a system includes an access point and a station in communication with the access point. The station selectively implements adaptive periodic Power-Save (APPS)-Polling logic for communications between the station and the access point. The APPS-Polling logic is configured to determine a timer value for periodic PS-Polling by monitoring a periodicity of arrival packets for at least a threshold amount of time.

Claims

1. A system, comprising:

an access point; and

a station in communication with the access point,

wherein the station selectively implements adaptive periodic Power-Save (APPS)-Polling logic for communications between the station and the access point,

wherein the APPS-Polling logic is configured to determine a timer value for periodic PS-Polling by monitoring a periodicity of arrival packets for at least a threshold amount of time.

2. The system of claim 1 wherein the threshold amount of time is large enough to prevent random variations in said periodicity of arrival packets.

3. The system of claim 1 wherein, if the timer value is greater than a beacon interval, the APPS-Polling logic does not implement the timer value for periodic PS-Polling.

4. The system of claim 1 wherein, if a traffic profile provided by the access point indicates a packet arrival interval, the APPS-Polling logic uses the provided packet arrival interval as the timer value and foregoes said monitoring.

5. The system of claim 1 wherein the APPS-Polling logic determines a timeout timer value for PS-Polling based on the timer value and a received packet size.

6. The system of claim 1 wherein, if a traffic profile provided by the access point indicates a delay bound for the access point, the APPS-Polling logic uses the provided delay bound as a timeout timer value for PS-Polling.

7. The system of claim 1 wherein the APPS-Polling logic determines a start time for sending periodic PS-Polls based on an access time duration estimated as a time period between when a PS-Poll ACK is received and when buffered data in response to the last PS-Poll arrives.

8. The system of claim 7 wherein the start time is based on the estimated access time duration minus an adjustable time interval.

9. The system of claim 1 wherein the timer value and a start time for the timer value are adjusted over time.

10. The system of claim 1 wherein the APPS-Polling logic is configured to identify multiple flows and to determine a separate timer value and start time for periodic PS-Polling for each flow.

11. A communication device, comprising:

a transceiver with at least one wireless technology subsystem,

wherein, to maintain a Quality of Service (QoS) flow while conserving power for the communication device, the transceiver comprises logic that selectively determines a timer value for periodic Power-Save (PS)-Polling by monitoring a periodicity of arrival packets for at least a threshold amount of time.

12. The communication device of claim 11 wherein the threshold amount of time is large enough to prevent random variations in said periodicity of arrival packets and wherein, if the timer value is greater than a beacon interval, the transceiver does not implement the timer value for periodic PS-Polling.

13. The communication device of claim 11 wherein, if a traffic profile provided by an access point indicates a packet arrival interval and a delay bound, the transceiver uses the provided packet arrival interval as the timer value and foregoes said monitoring, and wherein the transceiver uses the provided delay bound as a timeout timer value for PS-Polling.

14. The communication device of claim 11 wherein the transceiver determines a timeout timer value for PS-Polling based on the timer value and a received packet size.

15. The communication device of claim 11 wherein the logic determines a start time for sending periodic PS-Polls based on an access time duration estimated as a time period between when a PS-Poll ACK is received and when buffered data in response to the last PS-Poll arrives.

16. The communication device of claim 11 wherein the timer value and a start time for the timer value are adjusted over time and wherein the transceiver is configured to identify multiple QoS flows and to determine a separate timer value and start time for each flow.

17. A method for a communication device, comprising:

determining if a packet arrival interval is provided by an access point;

if the packet arrival interval is provided, determining a timer value for periodic Power-Save (PS)-Polling based on the packet arrival interval; and

if the packet arrival interval is not provided, determining a timer value for periodic PS-Polling by monitoring a periodicity of arrival packets for at least a threshold amount of time.

18. The method of claim 17 further comprising,

determining if a delay bound is provided by the access point;

if the delay bound is provided, determining a timeout timer value for PS-Polling based on the delay bound; and

if the delay bound is not provided, determining a timeout timer value for PS-Polling based on the timer value and a received packet size.

19. The method of claim 17 further comprising determining a start time for sending periodic PS-Polls based on an access time duration estimated as a time period between when a PS-Poll ACK is received and when buffered data in response to the last PS-Poll arrives.

20. The method of claim 19 further comprising adjusting the timer value over time by repeating said monitoring and adjusting the start time over time by repeating said access time duration estimation.