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Re: [STDS-802-11-TGBN] CR for seamless roaming UL suspension and state changes

Hi, Duncan,

 

Thanks for the response.

If we follow the text, we may need some error handling process to enable the target AP MLD going back to State 3 and being kept as prepped when the ST execution response is not acked.

This case is also addressed but TBD in the current AP DL discussion as quoted below.

“2: Not at least until ST exec resp is transmitted. TBD when it’s not ack’ed (perhaps little value in transmitting other frames if Ack is not going through).”

 

BRs,

Frank 

 

 

From: Duncan Ho <00002b3e54cff3e2-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, January 13, 2026 2:07 AM
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBN] CR for seamless roaming UL suspension and state changes

 

External email : Please do not click links or open attachments until you have verified the sender or the content.

Hi Frank,

 

Thanks for your question. I think the text is more accurate, which cannot be properly reflected in the table. My thinking is the target AP MLD shall enter state 4 as soon as it receives the ST exec req relayed by the current AP MLD so it’s ready for the non-AP MLD. Then a moment later, the non-AP MLD will receive the ST exec resp from the current AP MLD, at which point the non-AP MLD will enter State 4 with the target.

 

BR,

Duncan

 

From: Frank Hsu (徐建芳) <frank.hsu@xxxxxxxxxxxx>
Sent: Monday, January 12, 2026 9:39 AM
To: Duncan Ho <dho@xxxxxxxxxxxxxxxx>; STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: RE: [STDS-802-11-TGBN] CR for seamless roaming UL suspension and state changes

 

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Hi, Duncan,

 

Thanks for preparing the document.

One question regarding when the target AP MLD entering the State 4, in the text below, it looks the target AP MLD shall enter State 4 once the current AP MLD receives an STA execution request, and the target AP MLD has been prepared.

However, in the table in your discussion and to my understanding, the target AP MLD should enter State 4 until the ST execution response is successfully sent.

Could you clarify it? Thanks!

 

BRs,

Frank 

 

37.16.6 SMD BSS transition execution procedure via the current AP MLD

If the current AP MLD receives an ST execution request within the timeout value described in 37.16.5.2 (Target links preparation) and the target AP MLD has been prepared for SMD BSS transition for the non-AP MLD as described in 37.16.5 (SMD BSS transition preparation procedure), then:

—     The current AP MLD shall transfer any context that is required per 37.16.8 (Context) and has not already been transferred to the target AP MLD (if any) (#10413)and stop transmitting any Class 3 management frames to the non-AP MLD.

—     (#10413)The target AP MLD shall enter State 4 from State 3 (see 11.3.1 (State variables)) with the non-AP MLD.

 

 

Case 1: ST execution via the current AP MLD

 

 

Current AP MLD

 

Target AP MLD

 

DL

UL

 

DL

UL

Target Unprepped

4

4

1

1

Target prepped

4

4

State 3 but disallow Class 3 (3a1)

State 3 but disallow Class 3 (3a1)

After ST Exec Req is sent and before ST Exec Resp is received

State 4 but disallow Class 3 mgmt (4a2)

State 4 but disallow Class 3 (4a)

State 3 but disallow Class 3 (3a1)

State 3 but disallow Class 3 (3a1)

ST Exec Resp received and DL draining period in effect

State 4 but disallow Class 3 except data, control (4b3,4)

State 4 but disallow Class 3  (4b3)

44

4

DL draining terminated

1

1

4

4

 

From: Duncan Ho <00002b3e54cff3e2-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Monday, January 12, 2026 12:30 AM
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBN] CR for seamless roaming UL suspension and state changes

 

External email : Please do not click links or open attachments until you have verified the sender or the content.

Dear Seamless Roaming TTT members,

 

I’ve drafted this CR to address the UL data suspension and  MLD state change. Could you please review it and let me know if you have any feedback?

Hope to see you in Victoria!

 

BR,

Duncan

 

 

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