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Doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 PS-Poll TXOP Date: 2012-11-08 Authors: David Xun Yang, Huawei, et. al.Slide 1.

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Presentation on theme: "Doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 PS-Poll TXOP Date: 2012-11-08 Authors: David Xun Yang, Huawei, et. al.Slide 1."— Presentation transcript:

1 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 PS-Poll TXOP Date: 2012-11-08 Authors: David Xun Yang, Huawei, et. al.Slide 1

2 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 David Xun Yang, Huawei, et. alSlide 2

3 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 July 2012 Slide 3David Xun Yang, Huawei, et. al

4 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 Introduction STA can send a PS-Poll/trigger frame to poll the data buffered at AP. AP responds with the polled data or ACK. STA may also have data to send to AP. –STA contend for the medium again –STA change its state from PS to Active Slides [1] proposed an approach for speed frame exchange, which supports downlink and uplink transmission. In this presentation, we propose to include PS-Poll in the Speed Frame Exchange procedure. Slide 4David Xun Yang, Huawei, et. al

5 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 An Example of Speed Frame Exchange Station with Uplink Data Only [1] : Slide 5David Xun Yang, Huawei, et. al SIFS ACK DATA STA wakes from sleep, e.g. at a scheduled wake time STA returns to sleep since last MoreData from AP is 0 SIFS ProbeDelay AP STA Wake ACK SIFS STA, with buffered UL traffic, starts transmission with UL DATA instead of PS-POLL. MoreData=0 RspFrm=00 DATA MoreData=1 RspFrm=00 MoreData=0 RspFrm=11 MoreData=0 RspFrm=10 MoreData is used to allow responder to correctly set Response Frame bits Because of MoreData in UL, responder knows that DATA is next

6 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 PS-Poll TXOP Problem: The first UL data from the STA in PS state –Collisions cannot be omitted PS-Poll / Trigger frame is allowed for the STAs that are not indicated in TIM [2] PS-Poll can also work as the initial frame well in Speed Frame Exchange –PS-Poll also has More Data bit in its Frame Control field –AP can respond with Data or ACK according to the current rule [3] –PS-Poll does not carry data STA can choose to send UL Data or PS-Poll to get the buffered data at AP. Slide 6David Xun Yang, Huawei, et. al ACK PS-Poll SIFS ProbeDelay AP STA Wake DATA SIFS DATA SIFS

7 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 PS-Poll Format Release the definition of PS-Poll format –Allow the AID field to be switched to Duration Slide 7David Xun Yang, Huawei, et. al Frame ControlDuration/IDBSSID (RA)TAFCS 22664

8 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 Reference [1] 12/0834r0 Speed Frame Exchange [2] 12/0127r1 Lowe power medium access [3] IEEE 802.11-2012 Slide 8David Xun Yang, Huawei, et. al

9 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 Straw poll / Pre-motion 1 Do you agree to allow PS-Poll as the first Uplink frame in Speed Frame Exchange? –Y –N –Abs Slide 9David Xun Yang, Huawei, et. al

10 doc.: IEEE 802.11-12/1325r0 Submission Nov. 2012 Straw poll / Pre-motion 2 Do you agree to change PS-Poll format as in slide 7? –Y –N –Abs Slide 10David Xun Yang, Huawei, et. al

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