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Doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Active Polling Date: 2012-09-17 Authors: Slide 1Yong Liu, Marvell, et. al.

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Presentation on theme: "Doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Active Polling Date: 2012-09-17 Authors: Slide 1Yong Liu, Marvell, et. al."— Presentation transcript:

1 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Active Polling Date: 2012-09-17 Authors: Slide 1Yong Liu, Marvell, et. al.

2 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Slide 2Yong Liu, Marvell, et. al.

3 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Slide 3Yong Liu, Marvell, et. al.

4 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Current 802.11 PS STA operations A PS STA can wake up periodically before beacons to check possible DL data from AP For pending UL data, a PS STA can wake up and send the data immediately as the medium access allows Slide 4Yong Liu, Marvell, et. al.

5 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Clock drift over long sleeping period ppm1us1ms1s1m1h1d 11.00E-060.001160360086400 55.00E-060.005530018000432000 101.00E-050.011060036000864000 202.00E-050.02201200720001728000 404.00E-050.044024001440003456000 Clock drift (us) In order to capture a desired beacon, a PS STA needs to wake up far in advance after a long sleep to avoid possible clock drift Slide 5Yong Liu, Marvell, et. al.

6 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Passive checking vs. active polling Active polling mode allows a low-power STA to poll AP immediately after waking up for information, instead of keeping awake for a long period to track beacons Slide 6Yong Liu, Marvell, et. al. Passive checking Active polling

7 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Active polling types Scheduled active polling (refer to 11-12-0823-00-00ah- targetwaketime) –AP schedules STAs’ wakeup times –STAs wake up at scheduled times for UL/DL transmissions –STAs need not track beacons Unscheduled active polling (refer to 11-12-0831-00-00ah- uplink-channel-access-general-procedure) –AP may allow a STA/group-of-STA to transmit an uplink frame anytime upon waking up –STAs need not track beacons Slide 7Yong Liu, Marvell, et. al.

8 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Active polling information Without tracking beacons, an active polling STA may miss the following information –Updated information elements in beacons –Timestamp – esp. useful to scheduled active polling STAs It is desired that an active polling STA can request the AP to provide the above information upon waking up AP can provide the requested information immediately or suggest the STA to check next beacon for the requested information –AP can provide a timer toward next beacon (refer to11-12-0409- 06-00ah-supporting-low-power-operation) Slide 8Yong Liu, Marvell, et. al.

9 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Straw poll / Pre-motion 1 Do you support to include in SFD that: –An active polling STA can solicit the BSS change sequence (one byte) from an AP upon waking up. –AP may provide the information immediately or suggest the STA to check beacons. Slide 9Yong Liu, Marvell, et. al.

10 doc.: IEEE 802.11-12/1101r1 Submission Sept. 2012 Straw poll / Pre-motion 2 Do you support to include in SFD that: –An active polling STA can solicit the current timestamp from an AP upon waking up –AP may provide the information immediately or suggest the STA to check beacons Slide 10Yong Liu, Marvell, et. al.

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