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Hi Yiqing, Thank you for your email. As I mentioned in my previous email, defining a primary link is not a desirable solution. Are you suggesting that the primary link is specified by the non-AP MLD during association
and never changes? That would be too restrictive for the non-AP MLD. But if non-AP can receive Beacons on any link despite defining a primary link, it defeats the purpose of defining one. It also warrants additional mechanisms by which non-AP updates the primary
link and that creates a bunch of new issues. A simpler solution proposed in 1706 is to grant the AP MLD and non-AP MLD both some flexibility. The non-AP MLD need not receive every Beacon frame. When it is critical for
the non-AP MLD to receive one and the AP tries to initiate frame exchanges on another link, the non-AP MLD can receive the Beacon by not responding to the initial Control frame on the other EMLSR links. This also allows the AP MLD to initiate frame exchanges
with the non-AP MLD when it has critical traffic to send to the non-AP MLD. Thanks, Gaurang From: liyiqing (C) <00001782e0ccda1b-dmarc-request@xxxxxxxxxxxxxxxxx>
WARNING:
This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros. Hi Vishnu and Gaurang, Thanks for raising the discussion. I also want to echo with setting primary link for non-AP MLD in EMLSR mode. It can provide flexibility
and help clarify transmission and reception behavior for non-AP MLD in EMLSR mode. It remains many unclear procedures currently for example how to receive management frames for non-AP MLD. At least we should open some discussion for this topic to see if it
is a good way to complete the descriptions for EMLSR mode. Thanks, Yiqing Li 发件人:
Vishnu Ratnam [mailto:vishnu.r@xxxxxxxxxxx]
Hi Gaurang,
I am not sure I follow you argument here for point 1. The response to PS-polls, IFS + backoff is applicable for the link which just
finished the beacon frame transmission, but my argument also valid for the other links. To elaborate, consider a scenario where an AP MLD operates on two links (link1 and link2) and there is a nonAP MLD operating in EMLSR mode on these two links. Say AP1 of
AP MLD is sending a beacon frame on link1 and the STA of EMLSR nonAP MLD associated on link1 is decoding this beacon. After the end of the beacon frame, the EMLSR nonAP MLD requires the EMLSR transition delay to switch to listen mode on all links. During this
transition delay, AP2 of the AP MLD should not be sending an initial control frame on link 2 since it will be missed by the nonAP MLD. This is the case that is not covered by your text. In my opinion, same condition should also be applied to link1 (which transmitted
the beacon), although the chance of violation can be low, as you mentioned in your response. Regards, Vishnu From: Gaurang Naik <gnaik@xxxxxxxxxxxxxxxx>
Hi Vishnu, Thank you for your response.
I believe the transition delay right after the transmission of the group addressed frames is not essential. From a non-AP side, it is not guaranteed
that it is receiving the group addressed frames, since it can elect to do so on any link. From the AP side, it is anyway likely to be responding to the PS-Polls received from STAs that wake up after seeing BUs in the TIM element. Furthermore, there is IFS
+ backoff for the AP which would likely take similar order of time as the transition delay.
About the definition of the primary link, the way I see it, if there is a primary link that the STA selects, it must stick to receiving Beacons and
group addr frames on that link. Otherwise, the purpose of defining the primary link is defeated. If the primary link is static, it curtails the flexibility of the non-AP MLD. If the primary link is to be changed, we would need to define an update mechanism,
which would add unnecessary complexity and would not be in the scope of this CR document. The proposed resolution in doc 1706 keeps things simpler.
Thanks, Gaurang From: Vishnu Ratnam <vishnu.r@xxxxxxxxxxx>
WARNING:
This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros. Hi Guarang, Thanks for the response. Regarding your second point, I am not prescribing to enforce that the EMLSR client only listen to beacons and other group addressed
frames on one link, it can indeed be a client implementation decision. Rather, I am saying the spec should enable an EMLSR client to choose to receive beacons primarily on one link, if it desires to do so. If an EMLSR client does choose such a “primary link”
for group addressed frame reception, the AP MLD should accordingly prevent overlap of individually addressed frames on any link with the group addressed frame transmissions on
only this primary link. As per the current text, the overlap of a frame exchange sequence with group-addressed frames on any link is prevented, which is unnecessary in such cases. The proposed spec rules should at least be generalized to accommodate
such optimization. Regards, Vishnu From: Gaurang Naik <gnaik@xxxxxxxxxxxxxxxx>
Hi Vishnu, Thank you for reviewing the document and for the offline discussions.
I will incorporate the editorial change in the next revision. Thank you for pointing it out. Regarding initiation of the frame exchange sequence, I think the current statement does imply that AP should not initiate frame exchanges either
(in addition to ending it). However, if you think that it needs to be explicitly called out, I can revise the statement.
About the second point, as I mentioned in our offline discussions, a non-AP MLD must have the flexibility to decide which link to receive the Beacons
on. Moreover, it cannot be assumed that the non-AP MLD listens to the Beacons on the same EMLSR link each time. The proposed text in document 1706r1 provides a recommendation to the AP to avoid overlaps b/w frame exchanges and group addressed frames on two
EMLSR links. If the AP MLD does initiate frame exchanges, then it also provides flexibility to the non-AP MLD to not respond to the initial Control frame. Therefore, the problem you mentioned in your example will not occur.
Thanks, Gaurang
From: Vishnu Ratnam <vishnu.r@xxxxxxxxxxx>
WARNING:
This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros. Thanks Gaurang for the draft, discussions and for incorporating some of my offline comments. I still have few more comments (some of which we discussed
about before but I want to include here for others’ consideration as well):
I remember you had some text for start time before. Any reason it was removed?
Regards, Vishnu From: Gaurang Naik <gnaik@xxxxxxxxxxxxxxxx>
Hi Alfred, Could you please queue document
1706r1
to the MAC queue? All, Kindly let me know if you have any feedback. Thanks, Gaurang From: huangguogang <000017b1384624cd-dmarc-request@xxxxxxxxxxxxxxxxx>
WARNING:
This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros. Hi Alfred, Please add the following contribution to the MAC queue: 11-22-0041-00-00be-Some-issues-on-SCS-operation.pptx Regards, Guogang Huang 发件人:
Alfred Asterjadhi [mailto:asterjadhi@xxxxxxxxx]
Hello all, First of all I would like to wish everybody a Happy New Year! I uploaded an updated version of the agendas, which contains the agenda for the next conference calls,
scheduled on Wednesday January 05 (JOINT), 10:00-12:00 ET and Thursday January 06 (MAC),
10:00-12:00 ET. The agendas can be found here: https://mentor.ieee.org/802.11/dcn/21/11-21-1775-18-00be-nov-jan-tgbe-teleconference-agenda.docx Note for CR documents: Please update the baseline to TGbe D1.31
for the CR documents. DIAL IN DETAILS FOR WEDNESDAY: Join the JOINT meeting here: https://ieeesa.webex.com/ieeesa/j.php?MTID=m47e46089d108a8ef448b7a3a11976593 Meeting number: 233 886 75218 Meeting password: wireless (94735377 from phones and video systems) DIAL IN DETAILS FOR THURSDAY: Join the MAC meeting here: https://ieeesa.webex.com/ieeesa/j.php?MTID=mff9e3bd94518bedcc608845d389fdd3e Meeting number: 234 227 52561 Meeting password: wireless (94735377 from phones and video systems) Let me know if you have any questions and/or suggestions. Best Regards, Alfred -- Alfred Asterjadhi, PhD IEEE802.11 TGbe Chair, Qualcomm Technologies Inc. Cell #: +1 858 263 9445 Office #: +1 858 658 5302 To unsubscribe from the STDS-802-11-TGBE list, click the following link:
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