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Re: [STDS-802-11-TGBE] [External Mail][营销邮件] [STDS-802-11-TGBE] 11-20/1046 SP1 discussion (restricted TWT)

Hi Boyce,

 

Just wanted to address the concern on pre-11be devices a little bit. In the 6 GHz channel, there are only 11ax STAs. So, the problem may not be as bad.

 

Regards,

Dibakar

 

From: Yangbo (Boyce, 2012 NT Lab) <yangbo59@xxxxxxxxxx>
Sent: Wednesday, September 16, 2020 2:26 AM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] 答复: [External Mail][营销邮件] [STDS-802-11-TGBE] 11-20/1046 SP1 discussion (restricted TWT)

 

Hi Chunyu,

        

Thanks for your contribution and sp

As you mentioned in the straw poll text, EHT STAs shall end it’s TXOP. What about pre-EHT STAs? If pre-EHT STAs don’t follow the rules, there would be two problems: 1, EHT STAs are actually have lower priority than legacy STAs by your SP, which seems not right to me. 2, In a real WLAN network, pre-EHT STAs would be the majority for a long time(According to IDC, Upto 40% of unit shipments in 2019 are 802.11n standard) and those STAs don’t follow any rules defined by restricted TWT mechanism, which would actually ruin the mechanism.

 

As to the wording, I suggest you use a more general description for the mechanism like ‘protected session’,  ’protected access period’ or ’protected access resource’ instead of ‘restricted TWT session(s)’ in this straw poll. So this straw poll focus only on the boundary rules. May be you can add another straw poll to ask whether 11be introduce restricted TWT.

 

Regards

Boyce Yangbo

 

发件人: 董贤东 [mailto:0000120bd98e7489-dmarc-request@xxxxxxxxxxxxxxxxx]
发送时间: 2020年9月16日 15:58
收件人: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: [STDS-802-11-TGBE] 答复: [External Mail][营销邮件] [STDS-802-11-TGBE] 11-20/1046 SP1 discussion (restricted TWT)

 

Hi, Chunyu,

 

Thanks for initialing this thread, I don’t object your proposal, but I think  we should have a solution for the case “a TXOP of legacy STA may overlap/partially overlap with the restricted TWT”.  BTW, could you add note in SP, “ a TXOP of a legacy STA overlaps/partially overlaps with the restricted TWT which is defined in SP2, this will be studied further”.

 

Best Regards

Xiandong Dong

 

发件人: Chunyu Hu <chunyuhu07@xxxxxxxxx>
发送时间: 2020年9月16日 12:36
收件人: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: [External Mail][营销邮件] [STDS-802-11-TGBE] 11-20/1046 SP1 discussion (restricted TWT)

 

Hi, all:

Based on feedback we collected, we prepared a second version of SP1 and hope to get some early feedback of the WG’s preference:

----------------

Version 1 (current one):

  • Do you agree to add to the TGbe SFD (in R1), a mode where an AP may announce restricted TWT session(s) such that:
    • Any STA supporting this mode, and associated to the AP, shall end its TXOP before the start of the restricted SP(s)
    • Note-1: the “restricted TWT” name is TBD.
    • Note-2: such restricted TWT SPs are intended to provide more predictable latency performance for latency sensitive traffic.

 

Version 2 (new):

  • Do you agree to add to the TGbe SFD (in R1), a mode where an AP may announce restricted TWT session(s) such that:
    • Any EHT STA associated to the AP, shall end its TXOP before the start of the restricted SP(s)
    • Note-1: the “restricted TWT” name is TBD.
    • Note-2: such restricted TWT SPs are intended to provide more predictable latency performance for latency sensitive traffic.

 

Discussion:

  1. Version-2 focuses on solving the EHT STA problem, and avoid creating “legacy EHT STAs”
  2. AP may enter this mode at its configuration. For example, it selectively announces this mode in some link(s), e.g. a 6GHz link.
  3. For legacy STAs, if there is interest in supporting this mode, e.g. joining such TWT sessions, we can discuss further in next step.
  4. AP can decide if to admit a STA to the BSS or link where the mode is on as one way to handle/mitigate the legacy STA issue. Can discuss this further in next step.

 

----------------

 

Feel free to send me or any co-authors an email or reply to this thread.

 

Thank you very much!

Chunyu

 

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