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Re: [STDS-802-11-TGBE] EMLMR STA

Hi Liwen,

 

Thank you for your document 1503r2 presented today. As I mentioned on the call briefly, these are my main concerns:

  • An AP MLD may not always transmit PPDUs at the “enhanced MCS/NSS” that is supported by the EMLMR device. In many cases, the basic MCS/NSS supported on the link may be sufficient to receive the PPDUs sent by the AP. In such a case, it is wasteful for the non-AP MLD to have to switch radios from the other links to the current link. This can be mitigated by the AP MLD indicating, within the initial frame, the MCS/NSS it plans to use in the current frame exchange sequence (as in CID 11589) or to at least provide one bit indication of whether the link MCS/NSS are sufficient or not. The non-AP MLD can then make an informed decision whether to switch other radios.
  • An ongoing downlink frame exchange on an EMLMR link should not prohibit uplink transmissions by the non-AP MLD on another EMLMR link (as in CID 11590). It is always possible that the non-AP MLD has retained some spatial streams on the other links (one example is in the first bullet above and there can be more).
  • A more generic way of implementing EMLMR is for the non-AP MLD to retain some “residual” NSS on the other EMLMR links, when there is an ongoing frame exchange on one EMLMR link. The indication of this residual MCS and NSS can be provided in the EML operating mode notification frame. This can prevent the loss of medium synchronization and improve channel access by allowing simultaneous DL transmission on multiple links.

 

Regards,

Vishnu

 

From: Stephen McCann <mccann.stephen@xxxxxxxxx>
Sent: Thursday, October 13, 2022 11:17 AM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] EMLMR STA

 

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Liwen,

           thank you for your earlier presentation on today's TGbe call.

 

I am unhappy about this term "EMLMR STA", as it's only transient and the same STA could also be referred to as an "EMLSR STA" a short time later.

 

I know it's not as short, but I think the draft should state "...a STA that operates in EMLMR mode". Thanks.

 

Kind regards

 

Stephen

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