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I think you kind of misunderstood me. The introduced Planned Of ESS For MLDs is used to tell the associated non-AP MLD whether there is a neighboring candidate (no matter it is a legacy AP or AP MLD) which the non-AP MLD can transition to.
The introduced Planned Of ESS For MLDs subfield is just a counterpart of the Planned Of ESS subfield. For an AP MLD, the original Planned Of ESS subfield shall be set to 1. Hence, we need to define a new subfield for MLDs.
If you doubt why we need to define a Planned Of ESS For MLDs subfield, I think you also need to doubt why we need to define a Planned Of ESS subfield in 11ax.
I don’t think it matters to the STA whether the transition candidates are MLD APs, legacy APs, or some mixture of the two. The STA will find out all that information, and make BSS/MLD selection decisions, once it actually performs its scan.
If a STA doesn’t support a given band, then any RSSI recommendation on that band is not relevant for it anyway.
I think the existing/baseline ESS Report is sufficient to handle MLDs. On a given channel, the AP/BSS sets the RSSI recommendation so that, if a STA scanning/operating on that channel receives the beacon/probe with RSSI equal to or lower than the ESS Report RSSI recommendation, there’s a good likelihood that, if the STA were to perform a scan, it would find some other APs/MLDs that might have better link quality. This cannot per a “perfect” recommendation because the ESS Report is broadcast and the AP doesn’t know what bands/channels the STA supports (e.g. the “best” transition candidate might happen to be on a channel/band that the recipient STA does not support). But nevertheless, it’s a good enough rough indication for this use case.
So I don’t think trying to be more accurate/granular specifically for MLDs really brings much benefit here.
On May 6, 2022 at 7:50:10 PM, huangguogang <000017b1384624cd-dmarc-request@xxxxxxxxxxxxxxxxx> wrote:
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