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[STDS-802-11-TGBN] Discussion on CRD for CID 6609 (about adding CSI status in Co-BF Invite frame)

Hi, All,

 

Following the presentation of this CRD in March F2F meeting and April’s teleconference, many constructive comments are received and addressed in the CRD. Appreciate very much your great support.

To further improve this CRD, please feel free to share your thoughts and I will address every one of them.

 

The link to CRD for CID 6609 is below:

https://mentor.ieee.org/802.11/dcn/25/11-25-2211-11-00bn-lb291-cr-for-cid-6609-in-37-15-2-1-4.docx

 

For you reference, the related CRD for CID 6610, which addresses the CSI status in Co-BF Response frame,  is queued to be presented in TGbn MAC meetings and the link is here

https://mentor.ieee.org/802.11/dcn/26/11-26-0720-01-00bn-lb291-cr-for-cid-6610-in-37-15-2-1-4.docx

 

This discussion focuses mainly on CID 6609. Here are some clarifications on the CR.

  1. The CSI status exchange in Co-BF transmission complements the CSI status exchange in sounding stage.
    1. The CSI status exchange in sounding stage is not a complete solution. For example, in a typical sounding sequence we first sound AP1’s STAs and then sound AP2’s STAs. Only AP1’s STAs’ CSI status can be updated. AP2’s STAs’ status cannot be updated since there is no more Co-BF sounding Invite or Response frame after that.
    2. Co-BF transmission stage CSI status exchange also addresses the problem that the CSI status may change over time (from sounding stage to transmission stage and along multiple transmission stages). The status is more updated than the CSI status obtained in sounding stage.
    3. The full CSI status exchange in transmission stage can be completed in one Co-BF transmission sequence (if both Invite frame and Response frame are successfully received by the other AP) since at this stage both APs have full and updated OBSS CSI status information.  
  2. It does not introduce extra frame exchanges and uses only 4 bits and thus the overhead is very small.
  3. The multi-bit mapping resolves the possibility of confusion by including only the STAs of which the CSI status is not requested to be removed by their associated AP in sounding stage and by ordering according to their AID12 values.

 

I look forward to your great feedback!

 

Thanks,

 

Zigui Yang from Samsung

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