Hi Ming,
Thank you for preparing the PDT.
The spec needs to provide guidance for the case when the link with the max BI is not accepted by the AP MLD.
Without such clarification, a non-AP MLD will lose frames.
Let’s assume an AP MLD had 3 links and AP 1 had BI=300ms, AP2 had BI=200ms and AP3 had BI=70ms.
During assoc, non-AP MLD requested LI=1 in assoc req frame.
Per the current motion, listen interval is in units of max BI. This means the requested listen interval value is 300ms
Now, it is possible that the AP MLD does not accept link 1 (corresponding to AP1). So the ML setup consists of link 2 (200ms) and link 3 (70ms).
What is the minimum duration for which the AP MLD buffers frames intended for the non-AP MLD in this situation?
If you say it is 300ms, then as shown in the figure below (fig 1), the non-AP MLD will be losing frames.
NOTE – the LI is 300ms, therefore the non-AP MLD is expected to be in doze state for up to 300 ms.
If you are expecting the non-AP MLD to listen to the beacon at 200ms (if monitoring link 2), or the beacon at 280 ms (if monitoring link 3), then the requested LI value of
300ms has no meaning.
Listen Interval feature is meant to aid power-save operation on the client device. A client device requests a listen interval value based on its local power constraints. If
the spec requires the client to wake-up sooner than the specified LI, it can have severe impact on the power-savings.
Given that AP has more resources and is not power constraint, it makes sense for the AP to buffer the frames longer so that the client can benefit.
In this example, if the AP were to buffer the frames for up to 400ms (fig 2), the requested LI is satisfied and the client will not lose any frames regardless of which link
it decides to monitor.
I would like to get the group’s view on this topic and make sure everyone understands the implication if we put a requirement that the client is expected to wake-up sooner
than the requested LI.
Fig 1: Non-AP MLD will lose frames if the AP MLD buffers for only 300ms
Fig 2: AP MLD buffers for at least 400ms.
Regards,
Abhi
From: Ganming(Ming Gan) <ming.gan@xxxxxxxxxx>
Sent: Wednesday, March 17, 2021 6:12 PM
To: STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBE] 答复: [STDS-802-11-TGBE] TGbe Teleconferences [03/17/2021]: Agendas Posted
CAUTION:
This email originated from outside of the organization.
Hello Alfred
Could you help add the SP about the following contribution into agenda
11-21-0082-01-00be-pdt-mac-mlo-power-save-listen-interval SP
https://mentor.ieee.org/802.11/dcn/21/11-21-0082-01-00be-pdt-mac-mlo-power-save-listen-interval.docx
Best wishes
Ming
发件人:
Alfred Asterjadhi [mailto:asterjadhi@xxxxxxxxx]
发送时间: 2021年3月16日 4:17
收件人:
STDS-802-11-TGBE@xxxxxxxxxxxxxxxxx
主题: [STDS-802-11-TGBE] TGbe Teleconferences [03/17/2021]: Agendas Posted
Hello all,
I uploaded an updated version of the agendas, which contains the agenda for the next conference calls, scheduled on Wednesday,
March 17 (MAC/PHY), 10:00-12:00 ET.
The agendas can be found here:
https://mentor.ieee.org/802.11/dcn/21/11-21-0385-05-00be-mar-may-tgbe-teleconference-agenda.docx
DIAL IN DETAILS FOR WEDNESDAY:
Join the MAC meeting here: https://ieeesa.webex.com/ieeesa/j.php?MTID=mfb2eb674f949c8c6823ca5a367ae501a
Meeting number: 129 723 0407 Meeting password: wireless (94735377 from phones and video systems)
Join the PHY meeting here:
https://ieeesa.webex.com/ieeesa/j.php?MTID=mc9ba8ba8d04b96937f3fbda4d419a8e3
Meeting number: 129 582 0621 Meeting password: wireless (94735377 from phones and video systems)
Notice: Please note that by now all authors of the submissions for PDTs and CRs (especially MAC) should have sent requests for feedback to the IEEE TGbe reflector. Members are invited
to provide feedback for these contributions prior to the conference call via e-mail so that the time in the conf calls is used efficiently.
Best Regards,
Alfred
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