Adapting blind reception duration for range and congestion

Patent metadata

Field	Value
Publication number	US-2016088567-A1
Application number	US-201414491936-A
Country	US
Kind code	A1
Filing date	Sep 19, 2014
Priority date	Sep 19, 2014
Publication date	Mar 24, 2016
Grant date	—

Abstract

Methods, systems, and devices are described for adapting blind reception duration for range and congestion. A wireless station may measure channel conditions (e.g., range to an access point (AP) and channel congestion), and adjust one or more sleep timers based on the conditions. The sleep timers may each be associated with a window for reception of an expected transmission. If the transmission is not received in the window, the station may enter a sleep state to conserve power. In one example, a beacon miss timer is adjusted, and the expected wireless transmission is a delivery traffic indication message (DTIM). In another example, a content after beacon (CAB) timer is adjusted and the expected wireless transmission is the CAB. In some cases, the station may measure a delay for a number of beacons and determine the adjustment based on the delays.

First claim

What is claimed is:

1 . A method of wireless communication, comprising:
measuring a channel condition parameter for a wireless channel; adjusting a sleep timer based at least in part on the channel condition parameter, wherein the sleep timer is associated with a receive window of an expected wireless transmission; and entering a sleep state based at least in part on the adjusted sleep timer and an absence of the expected wireless transmission during the receive window.

2 . The method of claim 1 , wherein the expected wireless transmission is a delivery traffic indication message (DTIM) beacon and the sleep timer is a beacon miss timer.

3 . The method of claim 1 , wherein the expected wireless transmission is a content after beacon (CAB) and the sleep timer is a CAB timer.

4 . The method of claim 3 , further comprising:
receiving a DTIM beacon with a CAB forecast; and initiating the CAB timer in response to receiving the DTIM beacon.

5 . The method of claim 1 , further comprising:
comparing the channel condition parameter to a congestion threshold.

6 . The method of claim 5 , wherein adjusting the sleep timer comprises:
reducing the sleep timer based on a determination that the channel condition parameter satisfies the congestion threshold.

7 . The method of claim 5 , wherein adjusting the sleep timer comprises:
increasing the sleep timer based on a determination that the channel condition parameter does not satisfy the congestion threshold.

8 . The method of claim 1 , further comprising:
determining that a neighboring station is transmitting during a target beacon transmit time (TBTT), wherein the channel condition parameter is based at least in part on the determination.

9 . The method of claim 1 , further comprising:
measuring a set of delays comprising a delay for each beacon in a set of monitored beacons; and determining a systematic beacon offset based at least in part on the set of delays, wherein adjusting the sleep timer is based on the systematic beacon offset.

10 . The method of claim 9 , wherein determining the systematic beacon offset comprises:
determining that a measure of variation for the set of delays is less than a variation threshold.

11 . The method of claim 1 , further comprising:
determining whether to enter the sleep state at one or more fixed sleep timer intervals of the sleep timer.

12 . The method of claim 11 , wherein adjusting the sleep timer comprises:
adding a next fixed sleep timer interval to the sleep timer based at least in part on a determination not to enter the sleep state at a previous fixed sleep timer interval of the one or more fixed sleep timer intervals.

13 . The method of claim 11 , wherein the measured channel condition parameter is one of a set of measured channel condition parameters associated with the one or more fixed sleep timer intervals, and wherein adjusting the sleep timer is based on the set of measured channel condition parameters.

14 . The method of claim 1 , further comprising:
identifying a number of missed beacons from a past number of beacons; and wherein adjusting the sleep timer comprises: increasing the sleep timer based at least in part on an increase in the number of missed beacons.

15 . The method of claim 1 , wherein the channel condition parameter is associated with hidden node detection.

16 . The method of claim 1 , wherein the channel condition parameter is based at least in part on a received signal strength indication (RSSI).

17 . The method of claim 1 , wherein the channel condition parameter is based at least in part on a range between a station and an access point (AP).

18 . The method of claim 1 , further comprising:
measuring a consumed power during a beacon wake cycle; and generating a datum relating the consumed power and the range.

19 . An apparatus for wireless communication, comprising:
means for measuring a channel condition parameter for a wireless channel; means for adjusting a sleep timer based at least in part on the channel condition parameter, wherein the sleep timer is associated with a receive window of an expected wireless transmission; and means for entering a sleep state based at least in part on the adjusted sleep timer and an absence of the expected wireless transmission during the receive window.

20 . The apparatus of claim 19 , further comprising:
means for comparing the channel condition parameter to a congestion threshold; wherein the means for adjusting the sleep timer comprises: means for reducing the sleep timer based on a determination that the channel condition parameter satisfies the congestion threshold; and means for increasing the sleep timer based on a determination that the channel condition parameter does not satisfy the congestion threshold.

21 . The apparatus of claim 19 , further comprising:
means for determining that a neighboring station is transmitting during a target beacon transmit time (TBTT), wherein the channel condition parameter is based at least in part on the determination.

22 . The apparatus of claim 19 , further comprising:
means for measuring a set of delays comprising a delay for each beacon in a set of monitored beacons; and means for determining a systematic beacon offset based at least in part on the set of delays, wherein adjusting the sleep timer is based on the systematic beacon offset.

23 . The apparatus of claim 19 , further comprising:
means for identifying a number of missed beacons from a past number of beacons; and wherein adjusting the sleep timer comprises: increasing the sleep timer based at least in part on an increase in the number of missed beacons.

24 . An apparatus for wireless communication, comprising:
a channel condition monitor to measure a channel condition parameter for a wireless channel; a sleep time adjuster to adjust a sleep timer based at least in part on the channel condition parameter, wherein the sleep timer is associated with a receive window of an expected wireless transmission; and a sleep state controller to enter a sleep state based at least in part on the adjusted sleep timer and an absence of the expected wireless transmission during the receive window.

25 . The apparatus of claim 24 , further comprising:
a channel condition evaluator to compare the channel condition parameter to a congestion threshold.

26 . The apparatus of claim 25 , wherein the sleep time adjuster is further to:
reduce the sleep timer based on a determination that the channel condition parameter satisfies the congestion threshold; and increase the sleep timer based on a determination that the channel condition parameter does not satisfy the congestion threshold.

27 . The apparatus of claim 24 , further comprising:
a rogue station detector to determine that a neighboring station is transmitting during a target beacon transmit time (TBTT), wherein the channel condition parameter is based at least in part on the determination.

28 . The apparatus of claim 24 , further comprising a beacon delay monitor to:
measure a set of delays comprising a delay for each beacon in a set of monitored beacons; and determine a systematic beacon offset based at least in part on the set of delays, wherein adjusting the sleep timer is based on the systematic beacon offset.

29 . The appar

Assignees

• Qualcomm Inc

Inventors

• Homchaudhuri Sandip
• Rajkumar Samuel Fnu
• Changlani Nitin Ashok
• Jayaraman Arunkumar
• Baliganapalli Nagaraju Pradeep
• Kumar Sumeet
• Chen Lian
• Cho James Simon

Classifications

• H04B17/30

  of propagation channels · CPC title

• H04W28/02

  Traffic management, e.g. flow control or congestion control · CPC title

• H04W52/0274 Primary

  by switching on or off the equipment or parts thereof · CPC title

• H04W52/0238

  where the received signal is an unwanted signal, e.g. interference or idle signal · CPC title

• H04W52/0216

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