Thank you, Yan, and Ying, for the useful discussion.
I think “minimum” is crucial to the accurate definition of Distribution Bandwidth.
The following example may explain why it is needed:
If we consider
DRU1 [-120:9:-12, 6:9:114] in Table 38-4—Data and pilot subcarrier indices for Distributed-tone RUs (DRU) in a 20 MHz UHR TB PPDU:
- The subcarriers of this DRU can be mapped to tones in a 20 MHz distribution bandwidth and also can be mapped to tones in a 40 MHz distribution bandwidth,
a 60 MHz distribution bandwidth, or an 80 MHz distribution bandwidth.
- This is because the range of subcarriers [-120:9:-12, 6:9:114] that defines DRU1 is a subset of the range of subcarriers that defines 20, 40, 60,
or 80 MHz distribution bandwidths
However, by definition, a distribution bandwidth of 20 MHz should be the only distribution bandwidth that can be used for this DRU.
Another example may be DRU1 [-242:18:-26,10:18:226] in
Table 38-5—Data and pilot subcarrier indices for Distributed-tone RUs (DRU) in a 40 MHz UHR TB PPDU:
if we follow the same logic above, this DRU can be mapped to distribution bandwidths 40, 60, or 80 MHz. Again, the distribution bandwidth that should be used for this DRU is 40 MHz which is the minimum amongst
all possible alternatives.
Please share your thoughts on this version of the definition:
“Distribution Bandwidth: A minimum channel width of 20, 40, 60, and 80 MHz over
which the subcarriers of a distributed-tone resource unit (DRU) are allocated”
Best regards,
Mahmoud Kamel
From: Yan (PACE) Zhang <00002dbff69c3987-dmarc-request@xxxxxxxxxxxxxxxxx>
Sent: Thursday, May 1, 2025 12:25 PM
To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBN] Definition of Distribution Bandwidth
Hi Ying,
Thank you for your reply.
I don’t think minimum is need in the general definition for Distribution Bandwidth. Here we are not talking about exactly what value of the DBW for each DRU allocation. This is a high level definition of DBW, adding 20, 40 ,60 or 80 MHz
is to clarify that the valid values for DBW.
I am fine with channel width if it is already used in other amendments.
Yan
After thinking more about Option 2, we think it could be improved as below for more accuracy.
Distribution Bandwidth: A minimum
channel width of 20, 40, 60, and 80 MHz over which the subcarriers of a distributed-tone resource unit (DRU) are allocated
The reason for the change is as follows. Take a 26-tone DRU with a DBW of 20MHz as an example. It holds true if we say it is also allocated over a DBW of 40, 60, or 80 MHz since 20MHz is a portion of a larger
channel width. To avoid this confusion, we should take the minimum of the four channel width choices that the DRU resides in as a more accurate definition of the distribution bandwidth.
As to “channel width” vs. “channel bandwidth”, there are many instances of “channel width” in REVme and 11be. It feels more natural to use “width” in the definition text and “bandwidth” in the definition title.
Thank you for initiating the discussions.
I think Option 2 is good. Can you please change channel width to channel bandwidth in the sentence?
A few comments proposed to add a definition for “Distribution Bandwidth” in the next draft of 11bn, and in yesterday’s PHY call, I received a suggestion to initiate a discussion to agree on a definition.
Below are 3 options for the definition, please share your thoughts on which one of them captures the concept accurately.
Option1: Distribution bandwidth of a DRU: The minimum bandwidth
of a channel in which all DRUs with the same number of tones and the same tone spacing as this DRU can be allocated.
Option2: Distribution bandwidth: A 20, 40, 60, or 80 MHz channel width over which the subcarriers of a distributed-tone
resource unit (DRU) are allocated.
Option3: Distribution bandwidth: The
width of a channel over which the subcarriers of one or more distributed-tone resource units (DRUs) are distributed.
To unsubscribe from the STDS-802-11-TGBN list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1
To unsubscribe from the STDS-802-11-TGBN list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1
To unsubscribe from the STDS-802-11-TGBN list, click the following link:
https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1
To unsubscribe from the STDS-802-11-TGBN list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGBN&A=1
|