Hi Cheng,
Regarding Motion 14 scheduled for Thursday PM1, I would like to request the addition of a note for technical clarification on the intention behind Motion 14 and its impact on the overall design.
Motion 14(MAC): Move to add the following text to the 11bq SFD:
- There is no Beacon frame transmitted in the mmWave ink by an IMMW AP
To clarify the technical scope after approving this motion, I suggest adding one of the two notes below, which are mutually exclusive, depending on your perspective.
- Note a: This motion does not preclude the transmission of a frame by IMMW AP to enable an un associated non-AP IMMW STA to discover the IMMW AP on the mmW channel and measure link quality.
- Note b: This motion prevents unassociated non-AP IMMW STA from discovering an IMMW AP on the mmW channel and measuring link quality.
If you wish to close the door on this issue, please add Note b (even though we haven't agreed on 'no probe request/response frame').
If you prefer to keep it open, Note a can be helpful.
I would suggest adding Note a.
The intention behind this is to confirm whether you agree with the potential impact of this motion, particularly focusing on disabling beam discovery and reachability checks for unassociated non-AP IMMW STAs.
Additionally, it would be greatly appreciated if you could share your thoughts on whether this should remain a limitation of TGbq devices due to a simple technical scope/design, or if you are open to defining a mechanism to provide a supplemental method for beam discovery/reachability checks that can be utilized by both unassociated and associated non-AP STAs.
Please note that I understand the need to keep the IMMW design as simple as possible, prioritizing cost reduction over performance.
Thus, I generally agree that transmitting beacons over mmW is redundant and unnecessary.
However, I have a concern about losing the functionality for an unassociated non-AP STA MLD to accurately assess mmW reachability.
Sub-7 GHz signal-based reachability checks are not stable or accurate.
In certain cases, it is useful for an unassociated non-AP IMMW STA to verify the presence of a communicable IMMW AP in the vicinity before deciding to use the mmW link and performing ML setup.
If we eliminate all in-band discovery mechanisms, the non-AP MLD would have to perform ML setup via the sub-7 GHz link and then proceed with beam establishment to locate a communicable IMMW AP.
This issue becomes more problematic when there are multiple candidate AP MLDs discovered via the sub-7 GHz band, especially if the non-AP MLD aims to associate with the best AP MLD affiliated with the IMMW AP providing optimal service. Conducting an exhaustive search to identify the best option imposes a significant burden and overhead on the non-AP MLD.
Furthermore, relying solely on sub-7 GHz signal quality to assess mmW link quality is inaccurate.
Regards,
Jonghoe Koo
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