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Re: [STDS-802-11-TGBN] Motions Requested for COBF

Hi Alfred,

 

Please add one more motion to this list ( based on 11-25/0381r1)

 

  • Move to add the following to the 802.11bn SFD:
    • The following information shall be exchanged before COBF PPDU:
      • Min-Nsym and Max-Nsym indication about the COBF PPDU length sent in the COBF invite frame
      • Suggested Nsym indication in the COBF response frame from shared AP
        • Sharing AP is allowed to ignore the shared AP’s suggestion
        • Suggested value shall not be smaller than the min-Nsym value from sharing AP

 

Passed unanimously

 

Thanks,

Sameer

 

From: Sameer Vermani
Sent: Tuesday, March 11, 2025 9:38 AM
To: asterjadhi@xxxxxxxxx; STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: RE: Motions Requested for COBF

 

Hi Alfred,

 

Please also add the following 3 to the motions queue (all based on document 11-25/0381r0)

 

  1. Move to add the following in the 802.11bn SFD:
    • The COBF PPDU’s GI+LTF support and signaling is as follows:
      • Support of following GI+LTF combinations to be mandatory at both AP and STA
        • 2x LTF +0.8us, 2xLTF+1.6us, 4xLTF+3.2us
      • Additionally, 2x LTF+0.8us GI usage for a COBF pair is exchanged at the group formation stage
        • Each AP conveys if it can use 2x+0.8us GI for this COBF group or not
        • No further last-minute negotiation before COBF transmission
      • Invite frame from sharing AP dictates the LTF+GI combination keeping the shared AP’s ability to use 2x LTF+0.8us in mind

 

Results of SP were  41Y/12N/32A

 

  1. Move to add the following in the 802.11bn SFD:
    • BSS ordering of per-user SIG fields in the preamble of a COBF transmission
      • In the cases where the user fields of either BSS may go first while preserving the Nss in non-increasing order, the user fields of the sharing BSS go first

 

Passed unanimously

 

  1. Move to add the following in the 802.11bn SFD:

There shall be a frame-exchange before the COBF sounding between the two APs which will at-least serve the following goals:

    • Unavailability/decline indication from the responding AP
      • Used by responding AP to refuse participation in a COBF sounding process
    • Exchange of sounding Nss capability of the STAs being sounded in the two BSSs
      • The minimum sounding Nss capability of the participating STAs in each BSS will be exchanged
    • Note: Design of the frames is TBD by MAC group

 

Passed unanimously

 

 

Regards,

Sameer

 

 

From: Sameer Vermani
Sent: Monday, March 10, 2025 6:36 AM
To: asterjadhi@xxxxxxxxx; STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: Motions Requested for COBF

 

Hi Alfred,

Please add the following PHY motions (all reached consensus in PHY adhoc without any objections based on document 11-25/0083r1) to the motions queue:

  1. Move to add the following to the 802.11bn SFD
    • 802.11bn defines the concept of a sync-reference AP and a sync-follower AP for CFO correction in COBF
      • Sync-follower AP pre-corrections needed
        • For sequential sounding:
          • All the NDPs sent by it during sounding phase that are sent for the purpose of sounding the STAs in the other BSS (Mandatory)
          • For the NDPs sent by it for sounding the STAs in its own BSS, it is recommended but not mandatory that the sync follower AP pre-correct those NDPs
        • For joint sounding
          • All the NDPs sent by it during the sounding phase (Mandatory)
        • The COBF sync and COBF PPDU during transmission phase using the same frequency pre-correction value as the sounding phase, when it is the sharing AP
      • Sync-reference AP does not pre-correct during transmission phase when it is the sharing AP

 

  1. Move to add the following to the 802.11bn SFD
    • The sync-follower AP shall use the NDPA frame sent by the sync-reference AP to pre-correct the NDP frequency to be within a TBD range (e.g., 350Hz) of the sync-reference AP’s frequency
      • Applies to sequential and joint sounding
      • The pre-correction of cross-BSS NDP and joint NDP is mandatory
      • The pre-correction of in-BSS NDPs is recommended but not a mandatory requirement

 

  1. Move to add the following to the 802.11bn SFD
    • The sharing AP is the AP that transmits the final sync frame before the COBF PPDU
      • Regardless of who is the sync-reference
      • Note: This ensures a consistent protocol and a consistent behavior at sharing AP

 

  1. Move to add the following to the 802.11bn SFD
    • The shared AP always pre-corrects COBF PPDU based on the final sync
      • To bring the two APs within a TBD frequency range of each other (e.g., ~350Hz)
      • Note: Regardless of which AP is the sync-reference, this ensures consistent behavior at shared AP

 

Thanks,

Sameer

 

 

 

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