Dynamic selection of early-RX duration during network sleep operation

Patent metadata

Field	Value
Publication number	US-9055530-B2
Application number	US-201213718654-A
Country	US
Kind code	B2
Filing date	Dec 18, 2012
Priority date	Sep 6, 2012
Publication date	Jun 9, 2015
Grant date	Jun 9, 2015

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.

First claim

What is claimed is:

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;
a missed beacon counter configured for incrementing based on a result of a channel adversity condition; and
a processor operationally coupled to the memory unit and the missed beacon counter, 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 and the channel adversity condition,
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 and a time period to remain awake,
determining, by the processor, a missed beacon signal,
wherein the missed beacon counter increments when the missed beacon signal is not the result of the channel adversity condition,
wherein the missed beacon counter does not increment when the missed beacon signal is the result of the channel adversity condition,
determining, by the processor, a beacon miss rate based on a value of the missed beacon counter,
increasing, by the processor, the time for the processor to wake-up before an expected arrival time of the next beacon signal when the beacon miss rate is greater than a target beacon miss rate, and
waking-up, by the processor, based on the increase in the 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 the target beacon miss rate, and the processor is further configured to determine over a period of time the 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 the target beacon miss rate, and the processor is further configured to determine over a period of time the 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 the 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 the 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 the 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 μsec.

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 μsec.

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 the target beacon miss rate, and the processor is further configured to determine over a period of time the 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 processor is further configured to, before going to a sleep mode, determine a temperature of the processor and varies the time the processor 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;
a missed beacon counter configured for incrementing based on a result of a channel adversity condition; and
a processor operationally coupled to the memory unit and the missed beacon counter, the processor configured to retrieve the wake-up information from the memory and dynamically determine a wake-up time duration based on at least the wake-up information and the channel adversity condition, wherein the wake-up time duration identifies a time period to remain awake,
determining, by the processor, a missed beacon signal,
wherein the missed beacon counter increments when the missed beacon signal is not the result of the channel adversity condition,
wherein the missed beacon counter does not increment when the missed beacon signal is the result of the channel adversity condition,
determining, by the processor, a beacon miss rate based on a value of the missed beacon counter,
increasing, by the processor, the time for the processor to wake-up before an expected arrival time of the next beacon signal when the beacon miss rate is greater than a target beacon miss rate, and
waking-up, by the processor, based on the increase in the time for the processor to wake-up before an expected arrival time of the next beacon signal.

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 a memory; and
varying, over a period of time, the wake-up time duration based on the wake-up information and a channel adversity condition, 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 and a time period to remain awake,
determining a missed beacon signal,
incrementing a missed beacon counter when the missed beacon signal is not the result of the channel adversity condition and not incrementing the missed beacon counter when the missed beacon signal is the result of the channel adversity condition,
determining a beacon miss rate based on a value of the missed beacon counter,
increasing the time to wake-up before an expected arrival time of the next beacon signal when the beacon miss rate is greater than a target beacon miss rate, and
waking-up based on the increase in the time to wake-up before an expected arrival time of the next beacon signal.

17. The method of claim 16 , whe

Assignees

• Qualcomm Inc

Inventors

• Homchaudhuri Sandip
• Young Jason A
• Jayaraman Arun

Classifications

• Y02B60/50

  Cross-Sectional Technologies · mapped topic

• H04W52/0216 Primary

  using a pre-established activity schedule, e.g. traffic indication frame · CPC title

• Y02D30/70

  in wireless communication networks · CPC title