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
2.
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
3.
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
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:
- 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
- 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
- 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
- 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
- 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
- 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