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Dear all, Thanks for your discussion during the presentation. I initiate this email thread to further discussion for doc 22/349. Please let me know your questions
and comments if you don’t have time to express them during the call.
Here are some response to Minyoung and Shubho’s questions.
Q1: Whether switch delay of EMLSR affect the blindness in UL short PPDU transmission?
A1: when EMLSR MLD do UL transmission on link1, whether link 2 will enter blindness mode depends on the total duration of switch delay period and UL PPDU length. Assuming
the UL PPDU length is 50 us, a 22 us switching delay (22+50=72us, which is the duration of MediumSyncThreshold) will trigger link 2 enter blindness mode. So you can see that link 2 will enter blindness mode even it is a small switching delay and short UL PPDU.
Q2: For blindness, can EMLSR be same as NSTR?
A2: No. For DL data transmission, NSTR will not enter blindness mode because most BA will shorter than 72us. But EMLSR will enter blindness for sure, because the initial
control frame exchange already larger than 72us. For UL short packet transmission, NSTR will enter blindness when UL PPDU length >=72us, while EMLSR will not enter blindness when UL length >= (72-swithing delay). Consider the PHY preamble and switching delay,
you can see that EMLSR will very easy to enter blindness even for short UL packet.
Q3: Why complexity is not considered in the presentation?
A3: The main purpose of this presentation is to show the performance of EMLSR and NSTR. Because performance is a very important factor for people to judge a feature.
For complexity, I don’t think it is an easy to compare, it relates to a lot of implementation details. Here I want to point out one more benefit of NSTR. There are full radios on both links for NSTR, so it is very flexible for a non-AP MLD to operate as STR
(when AP MLD set up two links with enough frequency gap) or NSTR (when AP MLD set up two links very close). But EMLSR MLD can not switch between STR and EMLSR even AP set up two links with enough frequency gap.
Regards,
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