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Re: [STDS-802-11-TGBE] Questions on doc 391r0

Hi Joe,

See below

Thanks

Laurent

 

From: Joseph Levy <Joseph.Levy@xxxxxxxxxxxxxxxx>
Sent: Friday, May 29, 2020 1:30 PM
To: Cariou, Laurent <laurent.cariou@xxxxxxxxx>; STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: RE: [STDS-802-11-TGBE] Questions on doc 391r0

 

Hi Laurent,

 

I have a few questions:

 

  1. Why is necessary to set a default PS state for the link on which the multi-link was setup? 
    As, the STA link is active during the setup process and “normal” PS state procedures can be used to set the link’s PS state.  Also, if we define the setup process as a frame exchange – any change in state of the link signaled during the frame exchange, does not take effect until the frame exchange is completed – hence the STA can easily set its own “initial” state as it desires.   

[LC] you need an initial power state to start with. Baseline defines it exactly this way:

  • active mode if association is done on the same link
  • power save mode and doze state if association is done on a different link with OCT.

We can signal it in the frame exchanges (setup, …), but it feels like a lot of burden and over-design for something that happens very infrequently.

 

  1. If the STA is establishing a MLD wouldn’t it do so to use it once it is established? So, why would it be advantageous to establish a MLD and have it be effectively a single link connection, until the other links are activated?  Why require all the additional signaling to turn the links on?

[LC] sorry I’m not sure I understand well the question here. The main mode of TID mapping we see is the default mode where all links are enabled (TIDs mapped to all links). In that situation, based on what we agreed, the STA just has to wake up in a particular link to operate on that link. There is no need for specific signaling. That’s why the initial mode we talk about here will happen only once in this case (during multi-link setup)

 

  1. If a STA only needs a single active link why would it bother setting up multi-links?   Wouldn’t it be simpler to just associate via legacy modes and set up a single link and then when it needs multiple links establish them then? 

[LC] that question goes way beyond the debate on that presentation. Even for single radio devices, it is very advantageous to be able to setup multiple links, and move from one link to the other as smoothly as possible and exploit load variations on all the links to improve throughput/latency.

  1. Given the overhead of managing a multi-link connection wouldn’t it be more efficient to only use multi-link connections when they are required/desired? 

[LC] again your question here is not for the SP/presentation but for multilink in general. But even if you setup multiple links, you can decide to operate on one of them all the time, and only use other links when required/desired..

 

Regards,

Joseph

 

 

From: Cariou, Laurent <laurent.cariou@xxxxxxxxx>
Sent: Thursday, May 28, 2020 9:44 PM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] Questions on doc 391r0

 

Hi all,

Q/A were stopped at the end of last 11be MAC call, for the contribution on power save state after enablement.

https://mentor.ieee.org/802.11/dcn/20/11-20-0391-00-00be-multi-link-power-save-state-after-enablement.pptx

 

I can answer your questions here if there are still remaining ones.

 

Thanks,

Laurent

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