Packet Structure for SC EDMG PPDU
Explore the IEEE 802.11-16/1394-01-00 packet structure for SC EDMG PPDU, focusing on the guard interval (GI) lengths and their definitions for Short, Normal, and Long GIs. Understand the positioning of GIs within the packet structure and how GI length changes are implemented. Discover the use of Ga64 sequence for GIs in SC-SISO CB1 and the SC CB1 PPDU format similarities with 11ad.
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Presentation Transcript
November 2016 doc.: IEEE 802.11-16/1394-01-00 Packet structure for SC EDMG PPDU for each GI length Date: 2016-November-07 Authors: Name Company Address Phone Email Alecsander Eitan Qualcomm eitana@qti.qualcomm.com Submission Slide 1 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC EDMG PPDU Format EDMG Header-A L-STF L-CES L-Header EDMG-STF EDMG-CEF NG60 payload EDMG Header-A L-STF L-CES L-Header EDMG supports 3 GI lengths: Short, Normal & Long Normal GI length corresponds to same time as 11ad GI ( = 64x1/1.76GHz) All GIs are Golay sequences Short GI has length of the Normal GI Long GI has double length of Normal GI Submission Slide 2 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 Agenda Clarify the place of guard intervals (GI) in a SC EDMG packet structure (this presentation is only about the SISO case) Emphasis on GI locations How is the GI length change done Definition of the Short and Long GI Submission Slide 3 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC CB1 PPDU format Submission Slide 4 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 What sequence to use for GI in SC-SISO CB1 We propose to use the same sequence (Ga64) that is used in 11ad to maintain compatibility and enable smooth transition between the legacy part and the new part. We would like to maintain the property that each data part of a SC-BLK is surrounded on both sides with GIs of the same type This enables using a consistent algorithm for frequency offset and phase tracking GI 64 GI 64 GI 64 EDMG Header-A 1 GI 64 EDMG Header-A 2 GI 64 Data 496 GI 64 Data 496 GI 64 Data 496 GI 64 L-STF L-CEF L-Header L-Header Submission Slide 5 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC CB1 PPDU format Very similar to 11ad PPDU format. Addition of 2 EDMG Header-A SC blocks No EDMG-STF or EDMG-CEF GI between every 2 data/header symbols and at the end of the packet. This structure is suitable only for Normal GI (same as in 11ad) Submission Slide 6 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC-SISO CB1 Short/Normal/Long GI GI 64 GI 64 GI 64 EDMG Header-A 1 GI 64 EDMG Header-A 2 GI 64 Data 448 GI 64 Data 448 GI 64 Data 448 GI 64 L-STF L-CEF L-Header L-Header GI 64 GI 64 GI 64 EDMG Header-A 1 GI 64 EDMG Header-A 2 GI 64 Data 480 GI 32 Data 480 GI 32 Data 480 GI 32 L-STF L-CEF L-Header L-Header GI 64 GI 64 GI 64 EDMG Header-A 1 GI 64 EDMG Header-A 2 Data 384 Data 384 Data 384 GI 128 GI 128 GI 128 GI 128 L-STF L-CEF L-Header L-Header The drawing show the proposed packet structures for SC SISO CB1 with normal, short and long GI. Submission Slide 7 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 The Transition GI 32 GI 64 EDMG Header-A 2 GI 64 Data 448 GI 64 GI 64 EDMG Header-A 2 GI 64 Data 480 GI 32 GI64 GI 64 EDMG Header-A 2 Data 384 GI 128 GI 128 GI 128 It works if the short/normal/long GI have the property drawn on the right hand figure The GI32 is the last part of GI64 The GI64 is the first part of GI128 Submission Slide 8 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 GI Sequences Use current Ga64 for the normal size GI. Use the negation of the sequence A generated with: ?=[2 1 4 8 16] and ?=[1 1 1 1 1] for GI32 (Short) Use the negation of the sequence generated by: ?=[2 1 4 8 16 32 64] and ?=[1 1 1 1 1 1 1] f or GI128 (Long) Submission Slide 9 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC CB>1 PPDU format EDMG Header-A L-STF L-CES L-Header EDMG-STF EDMG-CEF NG60 payload EDMG Header-A L-STF L-CES L-Header Submission Slide 10 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC CB>1 Packet structure Primary and Secondary sections (till EDMG-STF start) GI as in 11ad (on Primary and each Secondary) Before L-header and between every two header symbol After the EDMG Header A second symbol WB section (starting immediately after EDMG-CEF) Before every data symbol After the last symbol. Use GI corresponding to GI type (Short/Normal/Long) and CB value (32xCB/64xCB/128xCB) Submission Slide 11 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 SC-SISO CB2 Short/Normal/Long GI Submission Slide 12 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 GI Sequences (except CB3) GI Length for Short/Normal/Long: CB=2 64/128/256 CB=3 96/192/384 CB=4 128/256/512 Ga and Gb are defined by: Ga64 and Gb64: DK = [1 8 2 4 16 32], WK = [-1,-1,-1,-1,+1,-1] Ga128 and Gb128: DK = [1 8 2 4 16 32 64], WK = [-1,-1,-1,-1,+1,-1,-1] Ga256 and Gb256: DK = [1 8 2 4 16 32 64 128], WK = [-1,-1,-1,-1,+1,-1,-1,+1] Ga512 and Gb512: DK = [1 8 2 4 16 32 64 128 256], WK = [-1,-1,-1,-1,+1,-1,-1,+1,+1] Submission Slide 13 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 Summary This presentation clarifies the location and size of the GI sequences in SC SISO PPDU for all CB and GI length options. This presentation includes a definition and method for GI length change in the challenging case of CB1. Submission Slide 14 Alecsander Eitan (Qualcomm)
November 2016 doc.: IEEE 802.11-16/1394-01-00 Straw Poll Do you agree to add to the SFD: 1. SC SISO to use 11ad Ga64, and derives, for CB=1 without additional EDMG STF & CEF, as in slides 7- 9, for Short and Long GI cases 2. SC CB>1 Frame Format to be as in slide 11 & 13. Submission Slide 15 Alecsander Eitan (Qualcomm)
