Hi Alfred,
Would you please add the following CoBF SPs to the MAC queue?
- Do you agree to use the following CoBF transmission sequence to support STAs requiring ICF/ICR before data frame exchanges?
- The frame sequence consists of:
- A CoBF Invite/CoBF Response frame exchange between the sharing and shared APs.
- Follows ICF/ICR frame exchanges between the APs and their associated STAs happening sequentially across the two APs; sharing AP then shared AP.
- The presence of the ICF/ICR frame exchange from each AP is conditional on the CoBF PPDU being addressed to one or more STAs.
- The presence of the ICF/ICR frame exchange from each AP is indicated in the CoBF Invite/Response frames.
- ICF1-ICR1 are exchanged between the sharing AP and its STAs
- ICF2-ICR2 are exchanged between the shared AP and its STAs
- Finally, a CoBF Trigger/Sync frame preceding the data PPDUs sent by the two APs simultaneously.
- Frame sequence for Ack information polling is TBD.
- Whether the CoBF-invite and ICF1 can be merged and/or CoBF-response and ICF2 can be merged is TBD.
- Do you agree to use the following sequence for acknowledgement information polling from STAs scheduled in a CoBF transmission sequence
- MU-BAR/BA frame exchanges are used by each AP separately, i.e., sequentially.
NOTE1: The first MU-BAR frame (transmitted by the sharing AP) can be embedded in the preceding DL PPDU as in baseline.
NOTE2: The frame sequence for eliciting simultaneous ACKs from clients of both sharing and shared APs if agreed in PHY is TBD.
- Do you agree that:
–
For DPS non-AP STA(s) scheduled with CoBF in high capability mode, the same switch-back behavior as for eMLSR with extended time-out period is used.
- Do you support that any CoBF sounding sequence that includes Cross-BSS CSI collection shall be initiated by a two-way handshake between the two APs participating in the sequence
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The two-way handshake exchange consists of a Sounding Invite frame and a Sounding Response frame.
–
The Sounding Invite/Response frame exchange is used to:
•
Confirm the availability of both APs for CSI collection.
•
TBD for indication whether each AP will include ICF/ICR exchanges with its client or not.
•
Further information to be exchanged is TBD.
Regards,
Sherief
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