Analog and Baseband Beam Tracking in IEEE 802.11ay

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Discover how Analog and Baseband Beam Tracking technology is defined and implemented in IEEE 802.11ay for superior communication efficiency and performance. Explore protocols, signaling, training signals, feedback mechanisms, and use cases discussed in the July 2017 document.

  • IEEE
  • Beam Tracking
  • Baseband
  • Analog
  • 802.11ay
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  1. July 2017 doc.: IEEE 802.11-17/1096r1 Analog and Baseband Beam Tracking in 802.11ay Date: 2017-07-10 Authors: Name Kome Oteri Affiliations Address Phone +1 858.210.4826 email Kome.oteri@ Interdigital.com 9710 Scranton Road, # 250 San Diego, CA, 92127 Li Hsiang Sun Alphan Sahin Hanqing Lou Rui Yang InterDigital, Inc. Submission Slide 1 Kome Oteri (InterDigital)

  2. July 2017 doc.: IEEE 802.11-17/1096r1 Introduction In [1], an agreement was made to enable mechanisms that support tracking of the baseband channel for SU-MIMO and MU-MIMO hybrid beamforming in 802.11ay Motion #195: Do you agree to include mechanisms that support tracking of the baseband channel for SU-MIMO and MU-MIMO hybrid beamforming in 802.11ay ? Yes/No/Abstain: 9/3/11 In this contribution, we define the protocol and signaling needed to enable both analog and baseband beam tracking for 802.11ay. This includes: The different types of beam tracking: DMG, EDMG: Analog (EDMG:A), EDMG: baseband (EDMG:B) The training signals The feedback The use cases We also show associated spec text to enable the elements mentioned above Submission Slide 2 Kome Oteri (InterDigital)

  3. July 2017 doc.: IEEE 802.11-17/1096r1 Beam Tracking Beam tracking enables an initiator or responder track the change in its beams without the need for the signaling and overhead of a BRP procedure. The signaling for beam tracking is sent in the DMG BRP packet header fields or EDMG header-A fields either in a standalone frame or piggy-backed on other transmitted frames. In 802.11ad, three beam tracking schemes are defined [3]: Initiator Receive Beam Tracking Initiator Transmit Beam Tracking Responder Receive Beam Tracking Submission Slide 3 Kome Oteri (InterDigital)

  4. July 2017 doc.: IEEE 802.11-17/1096r1 Beam Tracking Types in 802.11ad Request Train Train Initiator Responder Responder Initiator Initiator Responder Train Feedback Responder Receive Beam Tracking Initiator Transmit Beam Tracking Initiator Receive Beam Tracking In 802.11ad beam tracking may be one of three types: Initiator Receive Beam Tracking: The initiator sends a request to the responder and the responder sends a tracking packet to enable the initiator estimate its receive beams Initiator Transmit Beam Tracking: The initiator sends a training packet to the receiver and the receiver feeds back the desired feedback Responder Receive Beam Tracking: The initiator sends a training sequence to the responder and requests that it track its receive beams. Submission Slide 4 Kome Oteri (InterDigital)

  5. July 2017 doc.: IEEE 802.11-17/1096r1 Beam Tracking for 802.11ay For 802.11ay, two types of beam tracking can be defined: Analog Beam Tracking (AB): used to track the change in analog beams e.g. due to STA rotation, movement or blockage. Similar to 802.11ad tracking but updated for SU/MU-MIMO Baseband Beam Tracking (BB): used to track the change in the effective baseband channel (???) for a fixed set of analog beams in SU/MU MIMO scenarios Requires feedback of information for new baseband beams based on original analog beams (skips the analog procedure). ? = ??????? ??????? + ? ; ???=???? ??? H = MIMO channel; HBB = effective baseband MIMO channel FAr , FAt = Analog beamformer; FBt ,FBr = Baseband beamformer Submission Slide 5 Kome Oteri (InterDigital)

  6. July 2017 doc.: IEEE 802.11-17/1096r1 Baseband Tracking FBB Baseband beamformer FBB=I during tracking Analog beamformer Can estimate baseband channel efficiently by eliminating additional TRN fields in TRN packet for Initiator Transmit Beam Tracking (defined with EDMG_TRN_M). EDMG_TRN_M and EDMG_TRN_N fields are reserved while only EDMG_TRN_P field and EDMG_TRN_LEN fields are defined Submission Slide 6 Kome Oteri (InterDigital)

  7. July 2017 doc.: IEEE 802.11-17/1096r1 Steps for Beam Tracking in 802.11ay Setup Indicate if analog beam (AB) or baseband beam (BB) tracking request : (AB or BB) Indicate type of TRN packet and EDMG_TRN_length Define EDMG_P, EDMG_M and EDMG_N if applicable Training (for BB) Set baseband precoder to a fixed orthogonal matrix e.g. Identity matrix Transmit TRN units (T and P sub-units only) Indicate Feedback type required (default or explicitly signaled) Best Beam(s), SNR(s): (AB only) Channel Feedback or hybrid beamforming feedback (TBD): (AB or BB) Submission Slide 7 Kome Oteri (InterDigital)

  8. July 2017 doc.: IEEE 802.11-17/1096r1 Beam Tracking Specification Submission Slide 8 Kome Oteri (InterDigital)

  9. July 2017 doc.: IEEE 802.11-17/1096r1 Beam Tracking Specification The beam tracking specification needs to define the following: TXVECTOR/RXVECTOR settings: Defines a parameter used for the specific beam tracking type Packet Signaling between STAs: Communicates the beam tracking parameters set in TXVECTOR/RXVECTOR between STAs DMG: BRP packet header EDMG / EDMG (B) : BRP packet header + EDMG Header-A Training : Enables the measurement DMG: AGC + TRN Units EDMG:A / EDMG:B : TRN Units (EDMG_TRN_length, T, P, M and N) Feedback (case dependent): Enables feedback of the beam tracking measurements if required The feedback type is the same as last feedback type if previously requested. If the feedback type has never been requested, explicitly request for feedback. Submission Slide 9 Kome Oteri (InterDigital)

  10. July 2017 doc.: IEEE 802.11-17/1096r1 Current Beam Tracking Specification DMG [3] TXVECTOR/RXVECTOR BEAM_TRACKING_REQUEST TRN-LEN Packet Type BRP Packet Header Field Beam Tracking Request Field Training Length Field Packet Type Field Values 0/1 L BRP-TX, BRP-RX EDMG [2] TXVECTOR/RXVECTOR BRP Packet Header Field Beam Tracking Request Field Training Length Field Packet Type Field EDMG Header-A EDMG Beam Tracking Request EDMG TRN Length RX TRN-Units per Each TX TRN UNIT EDMG TRN-UNIT P EDMG TRN-UNIT M EDMG TRN-UNIT N Values N/A N/A BEAM_TRACKING_REQUEST TRN-LEN Packet Type BRP-TX, BRP-RX EDMG_BEAM_TRACKING_REQUEST EDMG_TRN_LEN RX TRN-Units per Each TX TRN UNIT EDMG_TRN_P EDMG_TRN_M EDMG_TRN_N 0/1 L TX/RX P, reserved M, reserved N, reserved Submission Slide 10 Kome Oteri (InterDigital)

  11. July 2017 doc.: IEEE 802.11-17/1096r1 Updated Beam Tracking Specification EDMG with Analog/Baseband Tracking TXVECTOR/RXVECTOR BRP Packet Header Field Beam Tracking Request Field Training Length Field Packet Type Field EDMG Header-A EDMG Beam Tracking Request EDMG TRN Length RX TRN-Units per Each TX TRN UNIT EDMG TRN-UNIT P EDMG TRN-UNIT M EDMG TRN-UNIT N EDMG Beam Tracking Request Type Values N/A N/A BEAM_TRACKING_REQUEST TRN-LEN Packet Type BRP-TX, BRP-RX EDMG_BEAM_TRACKING_REQUEST EDMG_TRN_LEN RX TRN-Units per Each TX TRN UNIT EDMG_TRN_P EDMG_TRN_M EDMG_TRN_N EDMG_BEAM_TRACKING_TYPE 0/1 L TX/RX P, reserved M, reserved N, reserved Analog/Baseband Submission Slide 11 Kome Oteri (InterDigital)

  12. July 2017 doc.: IEEE 802.11-17/1096r1 Updated TRN-Packet Definition Initiator Receive Beam Tracking : TRN-R packet If EDMG_BEAM_TRACKING_TYPE parameter in the RXVECTOR is Baseband Beam Tracking, the baseband beamformers at the initiator and responder should be set to a predetermined orthogonal matrix, e.g., the identity matrix, during the transmission of the appended TRN-R subfields only and the measurement at the initiator is based on the appended TRN-R packets. Initiator Transmit Beam Tracking : TRN-T packet If the EDMG_BEAM_TRACKING_TYPE parameter in the TXVECTOR is Baseband Beam Tracking, then EDMG_TRN_LEN TRN units are appended to the data packet (each with EDMG_TRN_P TRN subfields) and are transmitted using the same AWV as the preamble and data field of the packet. The baseband beamformer for the initiator and responder should be set to a predetermined orthogonal matrix, e.g., the identity matrix, during the transmission of the appended TRN-T subfields only and the measurement is based on the appended TRN-T subfields. Slide 12 Submission Kome Oteri (InterDigital)

  13. July 2017 doc.: IEEE 802.11-17/1096r1 Updated Feedback The feedback type shall be the same as the feedback type in the last BRP frame that was transmitted from the initiator to the responder with TX-TRN-REQ equal to 1. If the responder has never received a BRP frame from the initiator with TX-TRN-REQ equal to 1, and - If BEAM_TRACKING_REQUEST parameter in the RXVECTOR is Beam Tracking Requested, or if EDMG_BEAM_TRACKING_REQUEST parameter in the RXVECTOR is Beam Tracking Requested and EDMG_BEAM_TRACKING_TYPE is Analog Beam Tracking, the responder shall respond with all subfields of the FBCK-TYPE field equal to 0 and set the BS-FBCK field to the index of the TRN-T subfield that was received with the best quality. - If EDMG_BEAM_TRACKING_REQUEST parameter in the RXVECTOR is Beam Tracking Requested and EDMG_BEAM_TRACKING_TYPE is Baseband Beam Tracking, the initiator shall include a FBCK-REQ in a DMG Beam Refinement element as in 9.4.2.130 and request for the feedback needed. The responder shall respond with the requested feedback. Submission Slide 13 Kome Oteri (InterDigital)

  14. July 2017 doc.: IEEE 802.11-17/1096r1 Updated Use Cases A beam tracking initiator may transmit to the beam tracking responder a PPDU requesting transmit beam tracking if at least one of the following conditions is met: The time duration since the last PPDU it transmitted to the beam tracking responder that requested transmit beam tracking is greater than dot11BeamTrackingTimeLimit plus BRPIFS. A BRP frame with the channel measurement feedback from the beam tracking responder has been received. In addition, a beam tracking initiator or beam tracking responder may request baseband beam tracking if at least one of the following conditions is met: The performance of the system is degraded in a hybrid beamforming transmission and the requestor would like to re-estimate the baseband beams as part of the link adaptation procedure The requestor did not request for detailed baseband beam information as part of the MIMO setup procedure. In this case, the analog beams have been identified but the information to design the baseband beams is still needed. Submission Slide 14 Kome Oteri (InterDigital)

  15. July 2017 doc.: IEEE 802.11-17/1096r1 Conclusion Beam Tracking in 802.11ay has been discussed. The beam tracking for hybrid beamforming in 802.11ay may be : Analog Beam tracking Baseband Beam tracking Signaling and Procedures for both Analog and Baseband Beam tracking in 802.11ay are proposed. Submission Slide 15 Kome Oteri (InterDigital)

  16. July 2017 doc.: IEEE 802.11-17/1096r1 References [1] K. Oteri et. al., Further Discussion on Beam Tracking for 802.11ay IEEE doc. 11-17/0426r2, March 2017 [2] IEEE P802.11ay /D0.3, January 2017 [3] IEEE Std 802.11-2016, December 2016 [4] K. Oteri et. al., Protocols for Hybrid Beamforming in 802.11ay , IEEE doc. 11-17/0429r3, January 2017 [5] A. Maltsev, et al, Channel models for IEEE 802 11ay , IEEE doc. 11- 15/1150r8 [6] K. Oteri et. al., Draft Text for Analog and baseband Beam Tracking in 802.11ay IEEE doc. 11-17/1097r0, July 2017 Submission Slide 16 Kome Oteri (InterDigital)

  17. July 2017 doc.: IEEE 802.11-17/1096r1 Straw Poll Do you agree: to the changes in the specification draft as described in IEEE 802.11-17/1097r0 to define Beam Tracking and its associated signaling and procedures? Submission Slide 17 Kome Oteri (InterDigital)

  18. doc.: IEEE 802.11-17/1096r1 July 2017 APPENDIX Signaling and Packet Exchange for Beam Tracking in 802.11ad and 802.11ay Submission Slide 18 Kome Oteri (InterDigital)

  19. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Receive Beam Tracking (DMG) No Feedback : Reciprocity Initiator Responder MAC MAC 10.38.7 : par 1 TXVECTOR 10.38.7 : par 2 RXVECTOR BEAM_TRACKING_REQUEST= Beam Tracking Requested TRN-LEN = number of requested TRN fields (20.10.2.2.3) packet type = 0, TRN-R-PACKET BEAM_TRACKING_REQUEST= Beam Tracking Requested TRN-LEN = number of requested TRN fields (20.10.2.2.3) packet type = 0, TRN-R-PACKET Request PHY PHY STF CE Header Data 20.10.2.2.3: BRP Packet Header Fields See 20.5.3.1.1: Table 20-13/ 20.6.3.1.1 Table 20-17 Packet header Beam Tracking Request Field: 1 Packet Type Field: 0 (BRP-RX) Training Length field : Number of fields TRN-R = N AGC Data Header CE STF 20.10.2.2.3: BRP Packet Header Fields See 20.5.3.1.1: Table 20-13/ 20.6.3.1.1 Table 20-17 Packet header Beam Tracking Request Field: 0 Packet Type Field: 0 (BRP-RX) Training Length field : number of fields Request Responder Initiator Train Train Submission Slide 19 Kome Oteri (InterDigital)

  20. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Receive Beam Tracking (EDMG:A) Initiator Responder MAC MAC No Feedback : Reciprocity 10.38.7 TXVECTOR 10.38.7 RXVECTOR EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = analog beam tracking BEAM_TRACKING_REQUEST= Beam Tracking Not Requested TRN-LEN = 0 EDMG_TRN_LENGTH = Number of TRN Units packet type = 0, TRN-R-PACKET EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = analog beam tracking BEAM_TRACKING_REQUEST= Beam Tracking Not Requested TRN-LEN = 0 EDMG_TRN_LENGTH = Number of TRN Units packet type = 0, TRN-R-PACKET Request PHY PHY L-STF L_CEF L-Header EDMG-Header-A EDMG-STF EDMG-CEF Data 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 Packet Type Field: 0 (BRP-RX) Training Length field : 0 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per EachTX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 1, requested EDMG Beam Tracking Request Type= 0, analog beam tracking; TRN-R Data: optional EDMG-CEF EDMG-STF EDMG-Header-A L-Header L_CEF L-STF 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 Packet Type Field: 0 (BRP-RX) Training Length field : 0 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per EachTX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 0, Beam Tracking not requested EDMG Beam Tracking Request Type= 0, analog beam tracking; Request Responder Initiator Train Train Submission Slide 20 Kome Oteri (InterDigital)

  21. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Receive Beam Tracking (EDMG:B) Responder Initiator No Feedback : Reciprocity MAC MAC 10.38.7 TXVECTOR 10.38.7 RXVECTOR EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = baseband beam tracking BEAM_TRACKING_REQUEST= Beam Tracking Not Requested TRN-LEN = 0 EDMG_TRN_LENGTH = Number of TRN Units packet type = 0, TRN-R-PACKET EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = baseband beam tracking BEAM_TRACKING_REQUEST= Beam Tracking Not Requested TRN-LEN = 0 EDMG_TRN_LENGTH = Number of TRN Units packet type = 0, TRN-R-PACKET Request PHY PHY L-Header EDMG-Header-A EDMG-STF EDMG-CEF L-STF L_CEF Data 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per Each TX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 1, requested EDMG Beam Tracking Request Type= 1, baseband beam tracking; 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 Packet Type Field: 0 (BRP-RX) Training Length field : 0 TRN-R = 0,P Data (extended) EDMG-CEF EDMG-STF EDMG-Header-A L-Header L_CEF L-STF 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 , beam tracking not requested Packet Type Field: 0 (BRP-RX) Training Length field : 0 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per Each TX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 0, Not requested EDMG Beam Tracking Request Type= 1, baseband beam tracking; Request Responder baseband Initiator Train Train Submission Slide 21 Kome Oteri (InterDigital)

  22. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Transmit Beam Tracking (DMG) Feedback Initiator Responder MAC MAC 10.38.7 RXVECTOR 10.38.7 TXVECTOR BEAM_TRACKING_REQUEST= Beam Tracking Requested TRN-LEN = number of requested TRN fields (20.10.2.2.3) packet type = TRN-T-PACKET BEAM_TRACKING_REQUEST= Beam Tracking Requested TRN-LEN = number of requested TRN-Units (20.10.2.2.3) packet type = TRN-T-PACKET Train PHY PHY STF CE Header Data AGC TRN-T 20.10.2.2.3: BRP Packet Header Fields See 20.5.3.1.1: Table 20-13/ 20.6.3.1.1 Table 20-17 Packet header Beam Tracking Request Field: 1 Packet Type Field: 1 (BRP-TX) Training Length field : N Feedback Data Header CE STF 10.38.7: Feedback Type 1. feedback as last BRP frame 2. Index of TRN-T subfield Rx with best quality 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: Reserved Packet Type Field: Reserved Training Length field : 0 Feedback Method 1. piggyback 2. reverse direction grant (RD protocol) Train Responder Initiator Feedback Feedback Submission Slide 22 Kome Oteri (InterDigital)

  23. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Transmit Beam Tracking (EDMG:A) Responder Initiator Feedback MAC MAC 10.38.7 TXVECTOR RTXVECTOR EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = analog beam tracking BEAM_TRACKING_REQUEST= Beam Tracking not Requested TRN-LEN = 0 packet type = TRN-T-PACKET EDMG_TRN_LEN, EDMG_TRN_P, EDMG_TRN_M and EDMG_TRN_N EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = analog beam tracking BEAM_TRACKING_REQUEST= Beam Tracking not Requested TRN-LEN = 0 packet type = TRN-T-PACKET EDMG_TRN_LEN, EDMG_TRN_P, EDMG_TRN_M and EDMG_TRN_N PHY Train PHY L-STF L_CEF L-Header EDMG-Header-A EDMG-STF EDMG-CEF Data TRN-T 20.10.2.2.3: BRP Packet Header Fields See 20.5.3.1.1: Table 20-13/ 20.6.3.1.1 Table 20-17 Packet header Beam Tracking Request Field: 0 Packet Type Field: 1 (BRP-TX) Training Length field : Reserved 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per EachTX TRN UNIT = TX_RX EDMG TRN-UNIT-P = P EDMG TRN-UNIT M = M EDMG TRN-UNIT N = N EDMG Beam Tracking Request = 1, requested EDMG Beam Tracking Request Type= 0, analog beam tracking Feedback Data EDMG-CEF EDMG-STF EDMG-Header-A L-Header L_CEF L-STF 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0, not requested Packet Type Field: Reserved Training Length field : Reserved 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = 0 RX TRN-Units per EachTX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 0, not requested EDMG Beam Tracking Request Type= reserved 10.38.7: Feedback Type 1. feedback as last BRP frame 2. Explicit Request Train Responder Initiator Feedback Feedback Submission Slide 23 Kome Oteri (InterDigital)

  24. July 2017 doc.: IEEE 802.11-17/1096r1 Initiator Transmit Beam Tracking (EDMG:B) Initiator Responder Feedback MAC MAC 10.38.7 RXVECTOR 10.38.7 TXVECTOR EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = baseband beam tracking BEAM_TRACKING_REQUEST= Beam Tracking not Requested TRN-LEN = 0 packet type = TRN-T-PACKET EDMG_TRN_LEN = Number of TRN Units EDMG_TRN_P = P EDMG_TRN_M = EDMG_TRN_N = Reserved EDMG_BEAM_TRACKING_REQUEST = Beam Tracking Requested EDMG_BEAM_TRACKING_TYPE = baseband beam tracking BEAM_TRACKING_REQUEST= Beam Tracking not Requested TRN-LEN = 0 packet type = TRN-T-PACKET EDMG_TRN_LEN = Number of TRN Units EDMG_TRN_P = P, EDMG_TRN_M = EDMG_TRN_N = reserved PHY PHY DMG Beam Refinement element L-STF L_CEF L-Header EDMG-Header-A EDMG-STF (extended) EDMG-CEF Data TRN-T 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = Number of TRN Units RX TRN-Units per EachTX TRN UNIT = TX_RX EDMG TRN-UNIT-P =P EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 1, requested EDMG Beam Tracking Request Type= baseband beam tracking; 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 Packet Type Field: 0 (BRP-RX) Training Length field : Reserved Feedback Data EDMG-CEF EDMG-STF EDMG-Header-A L-Header L_CEF L-STF 10.38.7: Feedback Type 1. feedback as last BRP frame 2. Explicit Request 3. Default ?? 30.3.3.3.2.3 Table 15: EDMG-Header-A EDMG TRN Length = reserved RX TRN-Units per EachTX TRN UNIT = reserved EDMG TRN-UNIT-P = reserved EDMG TRN-UNIT M = reserved EDMG TRN-UNIT N = reserved EDMG Beam Tracking Request = 0, not requested EDMG Beam Tracking Request Type= reserved 20.10.2.2.3: BRP Packet Header Fields Packet header Beam Tracking Request Field: 0 Packet Type Field: Reserved Training Length field : Reserved Feedback Method 1. piggyback 2. reverse direction grant (RD protocol) Train Responder Initiator baseband Feedback Submission Slide 24 Kome Oteri (InterDigital)

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