Hi Nelson!
Thanks for the prompt response.
As you can see from my explanation, the base specification defines aSIFSTime for each PHY, even though the values are the same for all PHYs in the same frequency band. Therefore, I don't think there's any need to provide justification in the SP. I propose changing the SP1 as follows
Do you agree?
The IEEE 802.11bp amendment should include aSIFSTime = 10 µs in the PHY definition.
Best Regards,
Solomon Trainin
+972547885738
From: Nelson Costa [mailto:nelson@xxxxxxxx]
Sent: Wednesday, March 18, 2026 10:18 PM
To: Solomon Trainin <solomon.trainin1@xxxxxxxxx>
Cc: STDS-802-11-TGBP@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBP] aSIFSTime definition
Hi Solomon,
I think I may have caused some confusion. My question specifically asked why we were running the straw poll. I understood the SP to essentially say "we'll use the same value for SIFS that every other PHY already uses." My comments stemming from that were "If it's already defined in the baseline, why are we SPing this?"
I believe, based on your comments thus far, you're trying to say "We will likely write a value for aSIFSTime in our PHY clause. I would therefore ask the group to agree that value will be written as 10 µs, similar to other PHYs." Is that correct?
Cheers,
Nelson.
On Wed, Mar 18, 2026 at 9:10 AM Solomon Trainin <solomon.trainin1@xxxxxxxxx> wrote:
Hi Nelson!
As I understand your comment, you believe the aSIFSTime definition shouldn't be included in the 802.11bp amendment.
If you refer to the base standard, you'll see that, with the exception of WUR PHY, the IEEE 802.11 standard includes the aSIFSTime value in every PHY definition. WUR PHY only defines DL PPDUs, so SIFS isn't required.
Below, you can see how the base standard defines aSIFSTime for each PHY in the 2.4 GHz band. (IEEE P802.11-REVmf/D2.0, February 2026)
In SP1 (DCN 11-26-0540-01-00bp), I propose following the base standard's approach in our amendment by including the definition of aSIFSTime.
PHY (2.4GHz)
aSIFSTime is in
aSIFSTime value (us)
DSSS
Table 15-5—DSSS PHY characteristics
10
HR/DSSS
Table 16-4—HR/DSSS PHY characteristics
10
ERP
Table 18-5—ERP characteristics
10
HT
Table 19-25—HT PHY characteristics
10
HE
Table 27-61—HE PHY characteristics
10
EHT
36.4.4 EHT PHY refers to Table 27-61 (HE PHY Characteristics and Table 19-25 (HT PHY characteristics).
10
Best Regards,
Solomon Trainin
+972547885738
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