Hi Chris,
In addition to the “partial bandwidth NDP” issue, I’m afraid the motivation of the proposal is still not clear to me.
Specifically, I was hoping you could help me understand the need to assign different users to different channels/RUs in sensing. For instance, looking at the two figures below (slide 7 of your contribution), it is not clear why we couldn’t
simply transmit a 20 MHz NDP (left figure) or a 40 MHz NDP (right) instead of transmitting an 80 MHz NDP. If we used a 20 MHz NDP, for example, the 4 users on the first case would be able to estimate a 20 MHz channel. Isn’t that what we need? Using an 80
MHz NDP as shown in the figure results in the same (20 MHz estimates), but it uses more resources.
Different from data transmission, I don’t see at the moment the need in sensing to multiplex users in the frequency domain through OFDMA.
Thanks,
Claudio
From: Chris Beg chris.beg@xxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, November 2, 2021 2:32 PM
To: STDS-802-11-TGBF@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBF] Offline OFDMA Discussion
Hi everybody,
As I mentioned during the discussion of 21-1602r0 (https://mentor.ieee.org/802.11/dcn/21/11-21-1602-00-00bf-ofdma-measurement-discussion.pptx),
I wanted to open up an opportunity for any offline comments or discussion regarding the usage of OFDMA for Sensing before I run the SP.
One good point was raised on the need to define a partial bandwidth NDP, which would be appropriate. I’m interested to hear any thoughts or potential concerns on doing that within 11bf.
For the HE-PHY case, equation 27-59 in the 11ax spec describes the HE-LTF of an HE TB PPDU. From what I can tell, it constrains the definition to only subcarriers within the STAs allocated RU (e.g., subcarriers in the set Kr).
Therefore, could this be achieved within the scope of 11bf by extending the 11az TB Ranging NDP definition to allow flexibility in TXVECTOR.RU_ALLOCATION, and defining appropriate additions to the 11az MLME section describing the measurement
exchange?
Thanks and regards,
-Chris
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