Hi, Morteza,
Thank you for your explanation.
Although I agree that using pre-UHR PPDU might not be a best choice for a specific UHR STA, from the perspective of the whole BSS, I still believe allowing pre-UHR PPDU will make this feature
earns more benefits.
In the foreseeable future, I believe that there will still be a large number of pre-UHR STAs operating with a bandwidth that is less than the BSS bandwidth. Then, when the AP is serving such pre-UHR
STAs in primary subband, there will be still available RUs in DSO subband.
In such case, if the DSO STAs are allowed to transmit/receive the pre-UHR PPDU in DSO subband, the DSO STAs will earn EXTRA opportunities to access the wireless medium, and the medium efficiency
of the whole BSS can be improved.
I still don’t see the reason why we need to block such a significant use case for DSO in the specification.
Basically, I think it is up to implementation that whether an AP will schedule a EHT MU PPDU or UHR MU PPDU after the DSO ICF/ICR. Is there any other reason to prevent a DSO STA from transmitting/receiving
pre-UHR PPDU when they are in DSO subband?
Best Regards
Junbin Chen
----------------
From:
Morteza Mehrnoush <morteza.80211@xxxxxxxxx>
Date: Monday, July 28, 2025 at 10:53
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx <STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx>
Subject: Re: [STDS-802-11-TGBN] DSO PDT and CR doc 11-25/1164
There will be non-DSO UHR STAs, e.g. STAs with BW equal to AP's BW or STAs with smaller BW but don't support DSO, that can be scheduled with DSO STAs as mentioned in my last email. So it's not only between
DSO STAs. Issue is not DSO ICF; the ICF is non-HT DUP. The concept of allowing pre-UHR PPDU to be used in DSO TXOP was discussed in the past; based on the collective feedback from most of the members that was not the preference as this feature is for UHR and
using pre-UHR PPDU for UHR STAs downgrades their performance.
Hi Morteza,
Echo with Yuxin, I think the DSO ICF should be transmitted in a pre-UHR PPDU, thus the pre-UHR STAs can be scheduled in the primary subband
while the DSO STAs can be scheduled in the DSO subband in the same time.
It is not efficient to make the a TXOP to be DSO dedicated.
Best Regards
Junbin Chen
----------------
Hi Morteza,
Thanks for explaining. However, I'm not sure if the DSO ICF has to be carried in a UHR PPDU? I was not able to find the supporting words.
If carried in a pre-UHR PPDU, the pre-UHR STAs can decode and be scheduled conventionally. In case there are only few DSO STAs in a BSS, it would
be a waste to dedicate a DSO TXOP. Please clarify. Thanks
Pre-UHR STAs can’t be scheduled with the DSO STAs because pre-UHR STAs can’t receive UHR PPDU. But non-DSO UHR STAs can be scheduled with the DSO
STAs.
Per-UHR STAs can still be scheduled on the non DSO TXOPs.
Hi Morteza,
I see the following statement. Does it mean pre-UHR STAs are excluded from the current schedule? I expect that they can be scheduled within their
corresponding operating bw by the AP together with the DSO STAs via the DSO ICF. Could you clarify? Thanks
" The DSO ICF-ICR exchange and the PPDUs following it, shall
only be transmitted between UHR STAs"
Hi Mark,
Thanks for the comments. Attached please find the response.
R1 is uploaded on the server based on the comments.
I attach some comments.
Thanks,
Mark
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Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
1
Cambridge Square, Cambridge CB4 0AE Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
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