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Re: [STDS-802-11-TGBN] (2) [STDS-802-11-TGBN] DBE CR Docs

+ Abhishek from Samsung


Hi Shravan,

Sorry for the delayed response.


I prefer Option 3 the most.

Option 2 is also very attractive from an overhead perspective,

but the information is too limited, so it would be good to add more information (if there's room).


Additionally, I'm adding a colleague in this loop, from Samsung who is very interested in this topic.


Let's have more offline discussion.


Thanks.

Best,

Seongho.


--------- Original Message ---------

Sender : Kalyankar Shravan Kumar <00004444ef6d9ddc-dmarc-request@xxxxxxxxxxxxxxxxx> 

Date : 2026-01-13 02:26 (GMT+9)

Title : Re: [STDS-802-11-TGBN] DBE CR Docs


Dear Binita,

Thank you for preparing and presenting the CR. I have reviewed the document 11-25/1978 and would like to share a few comments and recommendations for further consideration:

  1. DBE NPCA Mechanism
    I understand that the DBE mechanism is designed to allow enterprise APs to utilize the NPCA mechanism, which enhances reliability, particularly when the     BSS bandwidth is less than 80 MHz and when OBSS is detected on P20.

  2. DBE Bandwidth Considerations
    It’s understood that the DBE bandwidth (the expanded bandwidth over the BSS bandwidth) essentially represents the     operating bandwidth of neighboring APs, assuming minimal traffic, especially in an enterprise network.

  3. Optimum Condition for DBE Mode
    In an ideal scenario where the BSS bandwidth is 20/40 MHz and DBE mode is enabled with a DBE bandwidth of 80 MHz, the NPCA mechanism can still function, with the NPCA PCH located in the secondary subband of the DBE bandwidth.

  4. BSS BW of 80 MHz or Above
    When the BSS bandwidth is 80 MHz or greater, the NPCA mechanism is enabled. However, if the AP enables DBE mode with a DBE bandwidth of 80 MHz, 160 MHz, or 320 MHz, the     AP will still operate the NPCA mechanism within the BSS bandwidth. If we allow the AP to move the NPCA PCH to the DBE secondary subbands, non-AP STAs that have enabled NPCA but disabled DBE mode would need to either disable NPCA or enable DBE mode (and expand the bandwidth to accommodate the new NPCA PCH) to ensures the NPCA mechanism remains functional within the expanded bandwidth, avoiding any loss of NPCA capability.

  5. Higher Probability of OBSS in the Expanded DBE Bandwidth
    As mentioned earlier, the expanded DBE bandwidth corresponds to the BSS bandwidth of neighboring APs in the enterprise network. As a result, there is a higher probability of OBSS occurring in the expanded bandwidth compared to the BSS bandwidth. If we consider moving the NPCA PCH from the BSS to DBE secondary channels,     we must take into account that the new NPCA PCH may encounter OBSS more frequently, which could lead to inefficiencies in the NPCA mechanism by allowing NPCA over DBE mechanism.

  6. Potential Issue with AP Disabling DBE Mode
    A potential issue arises when the AP disables DBE mode. In this case, should the STA also disable NPCA, or should there be a parameter update? To simplify this, I propose restricting the AP to fix the NPCA PCH within the BSS bandwidth when the BSS bandwidth is 80 MHz or greater. This would     eliminate the need for the STA to disable NPCA and then re-enable it after a parameter update. Moreover, if the BSS bandwidth is less than 80 MHz, the AP and STA can use the NPCA mechanism only by using the DBE mechanism.

  7. Usefulness of NPCA PCH in DBE Subbands
    The NPCA PCH in the DBE subband is most beneficial when the BSS bandwidth is less than 80 MHz, as the secondary subband can be utilized in the DBE secondary channels.

Given the above points, I highly recommend restricting the NPCA PCH location to the BSS bandwidth when the BSS bandwidth is 80 MHz or more, to ensure smooth operation of both the DBE and NPCA mechanisms.

I hope these comments and suggestions are helpful. Please feel free to let me know if you have any questions or need further clarification.

PFA

Best regards,
Shravan

 

 

From: Binita Gupta <bingupta.ieee@xxxxxxxxx>
 Sent: Thursday, January 8, 2026 7:40 AM
 To: STDS-802-11-TGBN@xxxxxxxxxxxxxxxxx
 Subject: [STDS-802-11-TGBN] DBE CR Docs

 

Hi DBE TTT members,

 

I have uploaded two DBE CR docs below:

 

1) 11-25/1980: proposing CRs for following DBE topics:

 ·        DBE mode transmission rules

 ·        TPE information for DBE BW

 ·        Rate control for DBE BW changes


 2) 11-25/1978:  proposing CRs for NPCA over DBE BW

 

 

Please review and provide any feedback you have.

 

Thanks,

Binita

 

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