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Re: [STDS-802-11-TGBN] [EXT] Re: [STDS-802-11-TGBN] Please review - the last few seamless roaming CIDs



Hi Duncan,

 

It is ok that the next SN to be assigned for DL individually addressed Data frames (during context transfer) is outside the non-AP STA's block ack window, e.g. when next SN is within non-AP MLD’s WinStartB + 2048. There is some issue when next SN is more than non-AP MLD’s WinStartB + 2048 and less than non-AP MLD’s WinStartB.

 

Best Regards,

Liwen

 

 

 

From: Duncan Ho <00002b3e54cff3e2-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, July 14, 2026 6:43 AM
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: [EXT] Re: [STDS-802-11-TGBN] Please review - the last few seamless roaming CIDs

 

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Hi Guogang, Pooya, and all,

 

Thanks for your comment. I expect the current AP MLD indicates the proper Next DL SN to the target AP MLD (based on the buffered data and the new data expected from the DS). Pooya added clarification below that says the target does not start transmitting the new DL data (from the DS) until it receives the Notify frame from the STA that indicates DL drain termination in this case.

 

"NOTE — If the amount of buffered or anticipated additional DL data in the current AP MLD for a TID exceeds the block ack window size during the DL draining period, the next SN to be assigned for DL individually addressed Data frames (during context transfer) might be outside the non-AP STA's block ack window, in which case the target AP MLD will not be able  to transmit the new MSDUs/A-MSDUs from the DS to the non-AP MLD until receiving from the non-AP STA a UHR Link Reconfiguration Notify frame with the Type field set to 2 and the DL Draining Completed field set to 1."

 

@Pooya Monajemi, please correct me if my understanding is wrong.

 

Thanks,

Duncan

 

 


From: huangguogang <huangguogang1@xxxxxxxxxx>
Sent: Monday, July 13, 2026 8:53 AM
To: Duncan Ho <dho@xxxxxxxxxxxxxxxx>; STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx <STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx>
Subject:
回复: [STDS-802-11-TGBN] Please review - the last few seamless roaming CIDs

 

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Hi Duncan,

 

Thanks for preparing this CR document. I have a question on the following note. If the next SN to be assigned for DL individually addressed Data frames (during context transfer) might be outside the block ack window, does the target AP MLD have a way to know that? We need to add the text to clarify this part.

 

NOTE If the amount of buffered DL data in the current AP MLD for a TID exceeds the block ack window size during the DL draining period, the next SN to be assigned for DL individually addressed Data frames (during context transfer) might be outside the block ack window, in which case the target AP MLD will not be able to transmit the new MSDUs/A-MSDUs from the DS to the non-AP MLD until the Next SN becomes part of the block ack window.

 

 

Regards

Guogang Huang

发件人: Duncan Ho <00002b3e54cff3e2-dmarc-request@xxxxxxxxxxxxxxxxx>
发送时间: 2026713 23:45
收件人: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
主题: [STDS-802-11-TGBN] Please review - the last few seamless roaming CIDs

 

Dear seamless roaming TTT members,

 

We're at the very last stretch. These are the last few CIDs scheduled for Wed AM2 Joint session.

 

10062 is a deferred CID but the rest have not been presented before. Could you please let me know if you have any feedback before the presentation?

 

Thanks!

Duncan

 

 


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