Re: [STDS-802-11-TGM] 11mf/D3.0 CID 2630 (definition of "secondary 20 MH

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Konbanha Adachi-san,

It would look like this:

secondary 20 MHz channel: In a 40 MHz basic service set (BSS), the 20 MHz channel adjacent to the primary 20 MHz channel that together form the 40 MHz channel of the 40 MHz BSS. In an 80 MHz BSS, the 20 MHz channel adjacent to the primary 20 MHz channel that together form the primary 40 MHz channel of the 80 MHz BSS. In a 160 MHz or 80+80 MHz BSS, the 20 MHz channel adjacent to the primary 20 MHz channel that together form the primary 40 MHz channel of the 160 MHz or 80+80 MHz BSS. In a BSS, the secondary 20 MHz channel is also the secondary channel.

Some other notes:

- The definition probably also needs to be extended to support 320 MHz BSSes.

- The "In a BSS," at the end is a bit weird now, and should probably be deleted.

- I guess the "secondary {40, 80, 160} MHz channel" definitions should be similarly changed.

Or we could make ourselves less vulnerable to spec rot (e.g. >320M BSSes in WIN) by just saying:

secondary 20 MHz channel: In a 40 MHz or wider basic service set (BSS), the 20 MHz channel adjacent to the primary 20 MHz channel that together form the (primary, for an 80 MHz or wider BSS) 40 MHz channel of the BSS. The secondary 20 MHz channel is also called the secondary channel.

… but maybe then we need to exclude *MG BSSes!

Thanks,

Mark

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

From: tomoko.adachi.b99@mail.toshiba <tomoko.adachi.b99@mail.toshiba>
Sent: Friday, 30 October 2026 10:31
To: Mark RISON <m.rison@xxxxxxxxxxx>; STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: RE: 11mf/D3.0 CID 2630 (definition of "secondary 20 MHz channel")

Caution: External Emails May Contain Spoofed Addresses, Malicious Links, or Attachments – Verify Before Engaging.

Hi Mark,

I’m not really sure how the definition will look like when the proposed change is accepted, but it seems OK.

The secondary 20 MHz channel should apply also when used in 2G4 for 40 MHz and in 6G for 40/80/160/320 MHz.

I’ll be at Bangkok.

Best regards,

tomo

From: Mark RISON <m.rison@xxxxxxxxxxx>
Sent: Friday, October 30, 2026 6:56 PM
To: STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGM] 11mf/D3.0 CID 2630 (definition of "secondary 20 MHz channel")

--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

I was asked to post to the reflector regarding CID 2630:

Comment:

"secondary 20 MHz channel" definition only seems to apply to a VHT BSS and hence does not apply to an HT or HE or EHT BSS in the 2G4 or 6G band [Subclause 3.2 at 281.56]

Proposed Change:

Delete "VHT" and "very high throughput (VHT)" throughout the definition

Proposed Resolution:

ACCEPTED [Motion CID 2630]

If you have any comments, this will come back up at the November F2F,

or you could reply here.