September 2017 SU Sounding Measurement Exchange - Insights and Guidelines
Detailed analysis of the September 2017 SU Sounding Measurement Exchange and Feedback document from IEEE 802.11-17/1305r2. The content covers VHT Sounding Protocol, Processing Time, Immediate and Delayed Feedback mechanisms, and more, offering valuable insights for understanding the protocol intricacies and optimizing performance in wireless communication systems.
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September, 2017 SU Sounding Measurement Exchange and Feedback Date: 2017-09-01 Authors: doc.: IEEE 802.11-17/1305r2 Name Christian Berger Marvell Affiliations Address Phone 408-222-9494 crberger@marvell.com email 5488 Marvell Ln, Santa Clara, CA ngrandhe@marvell.com Niranjan Grandhe Liwen Chu Marvell liwenchu@marvell.com Marvell hongyuan@marvell.com Hongyuan Zhang Marvell feng1.jiang@intel.com Feng Jiang Intel 3600 Juliette Ln, Santa Clara, CA qinghua.li@intel.com Qinghua Li Intel jonathan.segev@intel.com Jonathan Segev Intel Submission Slide 1 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 VHT Sounding Protocol NDP-A NDP Initiator Initiator SIFS SIFS SIFS SIFS NDP LMR Responder Responder SIFS Protocol is completely unscheduled When medium is idle, initiator can send NDP-A followed by NDP If available, responder replies with NDP within SIFS Followed by LMR within SIFS, which contains Time stamps t2/t3 of this exchange, or Time stamps t2/t3 of a previous exchange, or No time stamps, if none are ready Submission Slide 2 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Processing Time NDP-A NDP Processing Time Initiator Initiator SIFS SIFS SIFS SIFS NDP LMR Responder Responder SIFS Initiator needs feedback from responder T2 time-of-arrival (ToA) of NDP send by initiator T3 time-of-departure (ToD) of NDP send by responder The time available to determine t2 is about 70-80 s 2 SIFS = 32 s VHT NDP = 40-52 s (1-4 LTF) Submission Slide 3 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Processing Time (cont.) To determine an accurate ToA requires FFT processing Implementations can be in Hardware (delay on order of 10s of s) Firmware/software (delay on order of ms) Processing delay can depend on Bandwidth Number or receive antennas Number of LTF received Current load of other processing (firmware/software) Submission Slide 4 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Immediate and Delayed Feedback Immediate Feedback Sounding Sequence 1 LMR 1 Sounding Sequence 2 LMR 2 Time [ms] Delayed Feedback Min Processing Time Empty LMR Sounding Sequence 1 Sounding Sequence 2 LMR 1 Time [ms] Submission Slide 5 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Delayed Feedback MaxToaAvailable MinToaReady Sounding LMR Availability Time [ms] FTM Setup/Negotiation Responders declares MinToaReady Tells the initiator when to expect measurement results availability After this interval the initiator can expect the time stamps t2/t3 to be included in the next LMR Responder also declares MaxToaAvailable Tells the initiator how long the measurement results t2/t3 of a sounding sequence instance will be stored If no subsequent sounding sequence is exchanged for a duration of MaxToaAvailable past the measurement, responder may discarded t2/t3 Submission Slide 6 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Straw Poll 1 For SU operation the following behavior bounds the protocol development: Only LMR feedback calculation (TOA) and then delivery may require a scheduling mechanism. We agree that the SU case does not require a reoccurring availability window mechanism. Yes: No: Abstain: Submission Slide 7 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Motion Move to: Adopt the following text to spec framework document, instruct the SFD editor to include it in the TGaz SFD under the sub- section 3.2 and grant the editorial license to editor. For SU operation the following behavior bounds the protocol development: Only LMR feedback calculation (TOA) and then delivery may require a scheduling mechanism. We agree that the SU case does not require a reoccurring availability window mechanism. Moved: Seconded: Result: Submission Slide 8 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Straw Poll 2 Should the SU protocol supports immediate and delayed feedback. Report format (e.g. TOA, CSI) is TBD. Yes: No: Abstain: Submission Slide 9 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Motion We agree that the SU ranging protocol will support both immediate and delayed reporting. Note: The report formats (e.g. TOA, CSI) to be defined separately. Moved: Seconded: Result: Submission Slide 10 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Straw Poll 3 Should the single SU measurement and measurement report sequence be (as described on slide 2): NDPA (UL) <-SIFS-> NDP (UL) <-SIFS-> NDP (DL) <-SIFS-> LMR (DL) Where for immediate feedback the LMR is of this round and for delayed the LMR is the feedback from previous round. Yes: No: Abstain: Submission Slide 11 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Motion Move to: Adopt the following text to spec framework document, instruct the SFD editor to include it in the TGaz SFD under the sub-section 3.2 and grant the editorial license to editor. The single SU measurement and measurement report sequence shall be: NDPA (UL) <-SIFS-> NDP (UL) <-SIFS-> NDP (DL) <-SIFS-> LMR (DL) Where for immediate feedback the LMR is of this round and for delayed the LMR is the feedback from previous round. Moved: Seconded: Result: Submission Slide 12 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Straw Poll 4 For delayed SU normal operation: The iSTA shall not initiate another measurement sequence earlier than MinToaReady. If the iSTA initiates a following measurement sequence later than MaxToaAvailable, then the results may not be available (flushed) Yes: No: Abstain: Submission Slide 13 Christian Berger (Marvell)
September, 2017 doc.: IEEE 802.11-17/1305r2 Motion Move to: Adopt the following text to spec framework document, instruct the SFD editor to include it in the TGaz SFD under the sub-section 3.2 and grant the editorial license to editor. The iSTA shall not initiate another measurement sequence earlier than MinToaReady. If the iSTA initiates a following measurement sequence later than MaxToaAvailable, then the results may not be available (flushed) MaxToaAvailable Moved: Seconded: Result: MinToaReady Sounding LMR Availability Time [ms] Submission Slide 14 Christian Berger (Marvell)
