DYNAMIC SELECTION OF EARLY-RX DURATION DURING NETWORK SLEEP OPERATION

• US 20140064166A1
• Filed: 12/18/2012
• Published: 03/06/2014
• Est. Priority Date: 09/06/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: HomChaudhuri, Sandip, Jayaraman, Arun, Young, Jason A.
• Granted Patent: US 9,055,530 B2
• Time in Patent Office: Days
• US Class Current: 370/311
• CPC Class Codes: H04W 52/0216 using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems, methods, and devices for saving power in wireless communications devices are described herein. In some aspects, an apparatus includes a memory unit configured to store wake-up information associated with a wake-up time duration for receiving a beacon signal, and includes a processor operationally coupled to the memory unit. The wake-up time duration identifies a time for the processor to wake-up before an expected arrival time of the next beacon signal. The processor may be configured to retrieve the wake-up information from the memory, and vary, over a period of time, the wake-up time duration based on the wake-up information.

Claims

1. An apparatus for wireless communication, comprising:

a memory unit configured to store wake-up information associated with a wake-up time duration for receiving a beacon signal; and

a processor operationally coupled to the memory unit, the processor configured to

retrieve the wake-up information from the memory,

vary, over a period of time, the wake-up time duration based on the wake-up information, wherein the wake-up time duration identifies a time for the processor to wake-up before an expected arrival time of the next beacon signal.

2. The apparatus of claim 1, wherein the processor is further configured to vary the wake-up time duration based on missed beacon information.

3. The apparatus of claim 1, wherein the wake-up time duration is an Early-Rx parameter.

4. The apparatus of claim 1, wherein the wake-up information includes a target beacon miss rate, and the processor is further configured to determine over a period of time a beacon miss rate and to vary the wake-up time duration based on a comparison of the beacon miss rate and the target beacon miss rate.

5. The apparatus of claim 1, wherein the wake-up information includes a target beacon miss rate, and the processor is further configured to determine over a period of time a beacon miss rate and to increase the wake-up time duration when the beacon miss rate is greater than or equal to the target beacon miss rate.

6. The apparatus of claim 1, wherein the wake-up information includes a target beacon miss rate, and the processor is further configured to determine over a period of time a beacon miss rate and to decrease the wake-up time duration when the beacon miss rate is less than the target beacon miss rate by a defined safety margin.

7. The apparatus of claim 1, wherein the wake-up information includes a target beacon miss rate and a no-adjustment time interval, the no-adjustment time interval defining a period of time during which no adjustments to the wake-up time duration are made, and the processor is further configured to

determine over a period of time a beacon miss rate,

adjust the wake-up time duration based on a comparison of the beacon miss rate and the target beacon miss rate before a no-adjustment time interval expires, and

when the beacon miss rate is less than the target beacon miss rate.

8. The apparatus of claim 7, wherein the processor is further configured to increase the wake-up time duration when the beacon miss rate is greater than or equal to the target beacon miss rate.

9. The apparatus of claim 7, wherein the processor is further configured to decrease the wake-up time duration when the beacon miss rate is less than the target beacon miss rate.

10. The apparatus of claim 1, wherein wake-up time duration is adjusted in increments of time, each increment being less than or equal to 200 μ

sec.

11. The apparatus of claim 1, wherein wake-up time duration is adjusted in increments of time, each increment being less than or equal to 100 μ

sec.

12. The apparatus of claim 1, wherein wake-up time duration is adjusted in increments of time, each increment of time being less than or equal to 100 milliseconds.

13. The apparatus of claim 1, wherein the wake-up information includes a target beacon miss rate, and the processor is further configured to determine over a period of time a beacon miss rate and to iteratively increase the duration of the early wake-up time duration when the beacon miss rate is greater than the target beacon miss rate decrease and iteratively decrease the duration of the early wake-up duration when the beacon miss rate is less than the target beacon miss rate.

14. The apparatus of claim 1, wherein the microprocessor is further configured to, before going to a sleep mode, determine a temperature of microprocessor and varies the time the microprocessor wakes up based at least in part on the temperature.

15. An apparatus for wireless communication, comprising:

a memory unit configured to store wake-up information associated with an early wake-up time duration that defines when a processor wakes-up before a beacon signal is expected to be received; and

a processor operationally coupled to the memory unit, the processor configured to retrieve the wake-up information from the memory and dynamically determine the wake-up time duration based on at least the wake-up information.

16. A method of saving power in an apparatus for wireless communication, the method comprising:

storing wake-up information associated with a wake-up time duration for receiving a beacon signal;

retrieving the wake-up information from the memory; and

varying, over a period of time, the wake-up time duration based on the wake-up information, wherein the wake-up time duration identifies a time for a processor to wake-up before an expected arrival time of the next beacon signal.

17. The method of claim 16, wherein retrieving the wake-up information comprises an Early-Rx parameter.

18. The method of claim 16, further comprising determining the wake-up time duration based on at least the wake-up information.

19. The method of claim 16, further comprising:

determining, over a period of time, a beacon miss rate,

varying the wake-up time duration based on a comparison of the beacon miss rate and a target beacon miss rate, and

when the beacon miss rate is less than the target beacon miss rate, determining whether a no-adjustment time interval has expired.

20. The method of claim 19, wherein varying the wake-up time duration comprises increasing the wake-up time duration when the beacon miss rate is greater than or equal to the target beacon miss rate.

21. The method of claim 19, wherein varying the wake-up time duration comprises decreasing the wake-up time duration when the beacon miss rate is less than the target beacon miss rate by a defined safety margin.

22. The method of claim 19, wherein varying the wake-up time duration comprises varying the wake-up time duration based on a target beacon miss rate before a no-adjustment time interval expires, the no-adjustment time interval defining a period of time during which no adjustments to the wake-up time duration are made.

23. The method of claim 22, wherein varying the wake-up time duration comprises increasing the wake-up time duration when the beacon miss rate is greater than or equal to the target beacon miss rate.

24. The method of claim 22, wherein varying the wake-up time duration comprises decreasing the wake-up time duration when the beacon miss rate is less than the target beacon miss rate by a defined safety margin.

25. An apparatus for wireless communication, comprising:

means for storing wake-up information associated with a wake-up time duration for receiving a beacon signal;

means for retrieving the wake-up information from the memory; and

means for varying, over a period of time, the wake-up time duration based on the wake-up information, wherein the wake-up time duration identifies a time for the processor to wake-up before an expected arrival time of the next beacon signal.

26. The method of claim 25, wherein means varying the wake-up time duration comprises means for varying the wake-up time duration based on a target beacon miss rate before a no-adjustment time interval expires, the no-adjustment time interval defining a period of time during which no adjustments to the wake-up time duration are made.

27. A non-transitory computer-readable medium comprising code that, when executed, causes an apparatus to:

store wake-up information associated with a wake-up time duration for receiving a beacon signal;

retrieve the wake-up information from the memory; and

vary, over a period of time, the wake-up time duration based on the wake-up information, wherein the wake-up time duration identifies a time for the processor to wake-up before an expected arrival time of the next beacon signal.

28. A wireless communications device comprising:

a processor configured to vary, over a period of time, a wake-up time duration, the wake-up time duration identifying a time for the processor to wake-up before an expected arrival time of a next beacon signal,

wherein the variation of the wake-up time is based at least in part on temperature information.