Re: [STDS-802-11-TGBE] Feedback Requested for CRs related to NSTR operation - 11-21-0558r0

[Ronny Yongho Kim <ronny1004@xxxxxxxxx>]

Hi Matthew, 

Thank you for your proposed resolutions on NSTR related CIDs. 

I have a question on your resolution regarding CID 3147. 

Your proposed resolution is regarding the AP's behavior when the frame cannot be transmitted to the NSTR STA while it is transmitting on the other link. 

My comment was how the AP can handle the frame that needs to be transmitted to the NSTR STA during "should not transmit" circumstances. 

I would like to clarify the proposed text. 

Your proposed text a) suggests that AP shall abort the transmission to the STA and initiate the new transmission to a different STA. Then, what will happen to the frame that needs to be transmitted to the NSTR STA? The AP will wait until the end of the transmission of the STA of the same MLD on the other link and initiate the backoff procedure? What if there is no other frame to transmit to the other STA , what would be the AP's behavior?

  

Is your proposed text b) for the frame that was intended to transmit to the NSTR STA ?

If this is the case, then why the new backoff procedure needs to be invoked again? Since the AP has already gained the right to initiate transmission of a frame, the AP can just wait with backoff count 0 until the end of the transmission of the STA of the same MLD on the other link and then transmits the frame. If the AP follows the b), it has to repeat the new backoff procedures until the end of the transmission of the STA of the same MLD on the other link. 

An AP that is affiliated with an MLD should not initiate the transmissiont to a STA affiliated with a non-AP MLD, of a frame on aone link of an NSTR link pair of the intended recipient MLD non-AP MLD at the same time that the a STA of the non-APintended recipient MLD is transmitting a frame or is a TXOP holder on the other link of the NSTR link pair. An AP of an MLD that has gained the right to initiate transmission of a frame of an AC on a link through the rules for EDCA backoff in 10.23.2.4 (Obtaining an EDCA TXOP) but which does not initiate the transmission of a frame on that link due to this circumstance shall perform exactly one of the following actions:

a)     Initiate transmission on that link, of a different frame of the same AC to a different STA

b)     Invoke the backoff procedure for that AC of that link, while leaving CW[AC] and QSRC[AC] unchanged (#2100, #3147)

 

Best Regards, 

Ronny Yongho Kim

On Tue, Mar 30, 2021 at 5:07 AM Matthew Fischer <00000959766b2ff5-dmarc-request@xxxxxxxxxxxxxxxxx> wrote:

see:

https://mentor.ieee.org/802.11/dcn/21/11-21-0558-00-00be-cr-35-3-13-3-nstr-operation.docx

Matthew Fischer

Nice Guy

Broadcom Inc.

+1 408 543 3370 office

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