Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

[STDS-802-11-TGBE] CR doc 22/1768 - apply AAR to EMLSR and EMLMR

Hello all

 

I presented this contribution 22/1768 in Bangkok meeting. AAR in current text is used to ask for AP’s help to address the issue of blindness. Because blindness about NSTR was discussed first, then current text only mentions NSTR. However, EMLSR meets the same blindness issue, the corresponding description was added later as following and it is in the same subclause with AAR (35.3.16.8 Medium access recovery procedure)

 

When a non-AP MLD is operating in the EMLSR mode, a (#12242)non-AP STA affiliated with a non-AP MLD that is operating on one of the EMLSR links is considered to have lost medium synchronization if it is not able to perform CCA during frame exchanges that includes the link switch delays between an AP affiliated with an AP MLD and one of the other STAs operating on the other EMLSR links, which are affiliated with the same non-AP MLD. The STA that has lost medium synchronization shall start a MediumSyncDelay timer (#10422)and begin counting down immediately after returning to the listening operation if the duration of the loss of medium synchronization is longer than aMediumSyncThreshold; otherwise, the STA may not start the MediumSyncDelay timer.

 

EMLMR also meets the same issue, this part is now drafted by liwen 22/1505. It is quite straightforward to add EMLSR and EMLMR to AAR. I received support from the below commenters. Gaurang asked for defer, Shubho from BRCM help debate. Because of limited time, we can’t understand Garuang’s argument.

 

@Garugang, could you help raise your specific technical concern here?

 

CID

Commenter

Clause

Page

Comment

Proposed Change

10035

Morteza Mehrnoush

35.3.16.8.3

461.06

The current text defines the AP assisted medium sync recovery for NSTR. We should add EMLSR to use this medium sync recovery procedure.

please add EMLSR to use the AP assisted medium sync recovery

12427

Yongho Kim

35.3.16.8.2

461.05

Similar to NSTR STA MLD, EMLSR STA MLD also suffers from lost medium synchronization problem and also applies MediumSyncDelay after returning to EMLSR listening operation. AAR can also be applied to EMLSR operation. In case of EMLSR uplink transmission, the current AAR method of NSTR can be applied. In EMLSR downlink reception case, QoS Null with AAR control may be transmitted with BA.

As in comment

13407

Liwen Chu

35.3.16.8.3

461.05

The AAR should be also applied to eMLSR/eMLMR.

Fix the issues mentioned in the comment

13452

Liwen Chu

9.2.4.7.10

127.46

extend the usage of AAR to eMLSR/eMLMR link set.

As in comment.

13938

Ming Gan

35.3.16.8.3

461.09

The cases of EMLSR and EMLMR are missing

please complete the missing case

14075

Liuming Lu

35.3.16.8.3 AP assisted medium synchronization recovery procedure

460.60

When a STA of a non-AP MLD is exchanging frames with an AP affiliated with an AP MLD on one of the EMLSR links, the other STAs affiliated with the same non-AP MLD on the EMLSR links lose medium synchronization. This is similar to the blindness issue of the NSTR non-AP MLD operation. The AP assisted medium synchronization recovery procedure has been specified for non-AP MLD with a NSTR pair in IEEE 802.11be Draft 2.0. But the AP assisted medium synchronization recovery procedure or rules for non-AP MLD in EMLSR mode need to be clarified.

Suggest to specify the AP assisted medium synchronization recovery procedure or rules for non-AP MLD operating in EMLSR mode.

 

 

Best wishes

Ming Gan

To unsubscribe from the STDS-802-11-TGBE list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBE&A=1