Methods and arrangements for adaptively changing snoozing intervals of wireless devices

• US 7,787,406 B2
• Filed: 04/18/2007
• Issued: 08/31/2010
• Est. Priority Date: 04/18/2007
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: James, Tsai, Park, Minyoung
• Primary Examiner(s): Pérez-Gutiérrez; Rafael
• Assistant Examiner(s): Kirk; Lameka J.
• Application Number:
  US11/787,952
• Publication Number:
  US 20080261663A1
• Time in Patent Office: 1,231 Days
• Field of Search: 370/311, 455572-574, 455/343.1, 455/343.5
• US Class Current: 370/311
• 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

Methods and arrangements for wireless communications are described. Embodiments include transformations, code, state machines or other logic to adaptively change a snoozing interval of a station. The embodiments may also include determining a timeout (TO) period for a station, examining network traffic of the station after a period of network traffic inactivity not less than the TO period, and determining a snoozing interval, the length of the snoozing interval based upon the examination of the network traffic. The embodiments may also include adjusting the length of the TO period. In some further embodiments, examining network traffic may include determining categories of network traffic. In other further embodiments, examining network traffic may include determining a size of a queue of network traffic for the station. The embodiments may also include redetermining a snoozing interval after returning to a normal power mode.

Claims

1. A method comprising:

determining a plurality of power-saving modes for a station, each power-saving mode comprising a snoozing interval and a timeout (TO) period;

selecting a power-saving mode of the power-saving modes for the station based upon a class of network traffic;

determining a class of network traffic of the station after awakening from a snoozing interval of the power-saving mode; and

determining a snoozing interval, the length of the snoozing interval based upon the determining;

the determining a snoozing interval comprising;

switching to another power-saving mode with a larger snoozing interval and a larger TO period than the power-saving mode based upon determining that the TO period of the power-saving mode has expired without any network traffic activity of the station;

switching to another power-saving mode based upon the class of network traffic after the awakening differing from the class of network traffic of the power-saving mode; and

remaining in the power-saving mode, the remaining comprising modifying the snoozing interval of the power-saving mode but retaining the TO period of the power saving mode, the remaining based upon determining that the class of network traffic after the awakening is the same as the class of the power-saving mode.

2. The method of claim 1, wherein:

the remaining comprises determining a size of a queue of network traffic for the station; and

modifying the snoozing interval of the power-saving mode comprises determining a snoozing interval based upon the size of the queue.

3. The method of claim 1, wherein determining a class of network traffic comprises determining an interpacket arrival time.

4. The method of claim 1 wherein determining a class of network traffic comprises determining an access class of network traffic.

5. A method comprising:

determining a timeout (TO) period for a station;

examining network traffic of the station after a period of network traffic inactivity not less than the TO period, the examining comprising determining a number of packets received in a period of time;

determining a snoozing interval, the length of the snoozing interval based upon the examining;

selecting a target number of entries in a queue of network traffic for the station;

determining a number of entries in the queue after returning from a power saving mode to a normal power mode; and

adjusting the snoozing interval, the adjusting comprising;

increasing the snoozing interval if the determined number of entries is zero;

leaving the snoozing interval unchanged if the determined number of entries equals the target number of entries; and

decreasing the snoozing interval if the determined number of entries is greater than the target number of entries.

6. The method of claim 5, wherein:

increasing the snoozing interval comprises increasing the snoozing interval by a fixed amount; and

decreasing the snoozing interval comprises halving the snoozing interval.

7. The method of claim 5, wherein:

the method further comprises determining the number m of consecutive times of awakening after a snoozing interval with the target number of elements equal to the determined number of entries;

increasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\left(1+\frac{1}{m}\right)<br><br>\mathrm{SI}$

where SI is the length of the snoozing interval and m is greater than 0; and

decreasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\left(\frac{m}{1+m}\right)<br><br>\mathrm{SI}$

where m is greater than 0.

8. The method of claim 5, wherein:

the method further comprises determining the number m of consecutive times of awakening after a snoozing interval with the target number of elements in the queue;

increasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\mathrm{SI}+\left(\frac{1}{\left(m+1\right)}\right)<br><br>\mathrm{\Delta <br><br>}<br><br><br><br>\mathrm{SI};<br><br>$

and

decreasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\mathrm{SI}-\left(\frac{1}{\left(m+1\right)}\right)<br><br>\mathrm{\Delta <br><br>}<br><br><br><br>\mathrm{SI};<br><br>$

where SI is the length of the snoozing interval, <sup>Δ

SI</sup> is a fraction of the snoozing interval, and m is greater than 0.

9. An apparatus for wireless communications, the apparatus comprising:

a communications module to process network traffic;

a processor, responsive to the communications module, comprising;

a timeout interval determiner to determine a timeout (TO) period;

a queue information receiver to examine network traffic after awakening from a snoozing interval of a power-saving mode, the examination to comprise the determination of a class of network traffic; and

a power-saving mode determiner to determine a plurality of power-saving modes, each power-saving mode based upon a class of network traffic, each power-saving mode comprising a snoozing interval, and a timeout (TO) period, wherein;

the power-saving mode determiner comprises a snoozing interval determiner to determine a snoozing interval, the length of the snoozing interval based upon the class of network traffic, the snoozing interval determiner to;

select a power-saving mode with a larger snoozing interval and a larger TO period than a current power-saving mode based upon determining that the TO period of the current power-saving mode has expired without any network traffic activity of the station;

select a different power-saving mode than a current power-saving mode based upon determining that network traffic is of a class different from the class of the current power-saving mode; and

select the current power-saving mode, the selecting comprising modifying the snoozing interval of the power-saving mode but retaining the TO period of the power saving mode, the selecting based upon determining that the class of network traffic is of the class of the current power-saving mode; and

a power module, responsive to the snoozing interval determiner, to place the apparatus in a power-saving mode and to return the apparatus from the power-saving mode.

10. The apparatus of claim 9, wherein the snoozing interval determiner comprises a queue size adjuster to determine a snoozing interval based upon a size of a queue of network traffic for the apparatus.

11. The apparatus of claim 10, wherein:

the queue information receiver is to examine the network traffic after a return to a normal power mode from a power saving mode; and

the snoozing interval determiner is to determine a snoozing interval after the return, the determination of the snoozing interval to be based upon the examination of the network traffic after the return.

12. The apparatus of claim 9, wherein:

the processor comprises a filter to smooth a count of the number of received packets; and

the snoozing interval, responsive to the filter, is to moderate adjustments to the snoozing interval.

13. The apparatus of claim 9, wherein the snoozing interval determiner comprises a module to determine a snoozing interval based upon an interpacket arrival time.

14. An apparatus for wireless communications, the apparatus comprising:

a communications module to process network traffic; and

a processor, responsive to the communications module, comprising;

a timeout interval determiner to determine a timeout (TO) period;

a queue information receiver to examine network traffic after a period of network traffic inactivity not less than the TO period, the examination to comprise the determination of a number of packets received in a period of time; and

a snoozing interval determiner to determine a snoozing interval, the length of the snoozing interval based upon the examination of the network traffic, the snoozing interval determiner comprising a queue size adjuster to determine a snoozing interval based upon a size of a queue of network traffic for the apparatus, wherein the queue size adjuster is to;

select a target number of entries in a queue of network traffic for the station;

determine a number of entries in the queue after returning from a power savings mode to a normal power mode; and

adjust the snoozing interval, the adjusting comprising;

increasing the snoozing interval if the determined number of entries is zero;

leaving the snoozing interval unchanged if the determined number of entries equals the target number of entries; and

decreasing the snoozing interval if the determined number of entries is greater than the target number of entries; and

a power module, responsive to the snoozing interval determiner, to place the apparatus in a power-savings mode and to return the apparatus from the power-savings mode.

15. The apparatus of claim 14, wherein:

increasing the snoozing interval comprises increasing the snoozing interval by a fixed amount; and

decreasing the snoozing interval comprises halving the snoozing interval.

16. The apparatus of claim 14, wherein:

the queue size adjuster is to determine the number m of consecutive times of awakening after a snoozing interval with the target number of elements equal to the determined number of entries;

increasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\left(1+\frac{1}{m}\right)<br><br>\mathrm{SI}$

where SI is the length of the snoozing interval and m is greater than 0; and

decreasing the snoozing interval comprises applying the formula;

$\mathrm{SI}=\left(\frac{m}{1+m}\right)<br><br>\mathrm{SI}$

where m is greater than 0.