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Date: 2012-03-12

PS-Poll Immediate ACK Enhancements. Authors:. Date: 2012-03-12. Accepted enhancement using Immediate ACK to PS-Poll Message . STAs in doze state most of time, may not check beacon/TIM frames A STA wakes up at desired time and sends a PS-Poll message to AP to be informed of buffered data

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Date: 2012-03-12

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  1. Klaus Doppler, Nokia PS-Poll Immediate ACK Enhancements Authors: • Date:2012-03-12

  2. Klaus Doppler, Nokia Accepted enhancement using Immediate ACK to PS-Poll Message • STAs in doze state most of time, may not check beacon/TIM frames • A STA wakes up at desired time and sends a PS-Poll message to AP to be informed of buffered data • AP responds to this STA with an immediate ACK that contains indication of pending BU • The ACK frame has 1bit BU field indicating (add ref) • 1: traffic is buffered (as indicated in the TIM map), stay awake (i.e. a service period starts) • 0: no traffic is buffered, go back to sleep

  3. Klaus Doppler, Nokia Accepted PS-Poll and Immediate ACK Signaling

  4. Klaus Doppler, Nokia Motivation for Power Save Enhancements In overload conditions: AP may not be able to serve STA immediately STA may need to stay awake for long time If AP sends ACK BU=0 STA might go to sleep for long time

  5. Klaus Doppler, Nokia Proposed Field in Immediate ACK • Bits 2 … x: Duration until service period starts • Based on its buffer status and traffic priorities, AP estimates this duration • Allows the STA to enter Doze state again until the AP is ready to send data • If AP is unable to send data due to network overload, indicates BU = 0

  6. Klaus Doppler, Nokia Flowchart for PS Enhancements

  7. Klaus Doppler, Nokia Summary • Having just BU field in immediate ACK may be not enough in cases where AP might not always be able to serve the traffic immediately • Inclusion of the duration until service period field allows a STA to enter Doze state again until the AP is ready to send data

  8. Straw Poll • Do you agree to add a duration until service period field in the immediate ACK to a PS-Poll? Chittabrata Ghosh, Nokia

  9. Klaus Doppler, Nokia Reference • [1] IEEE 802.11-12/0127r0 Low Power Medium Access, January 2012

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