Nelson,
The standard will have normative language, and I do not think we want it to say the sequence “shall’ be used. So, the standard has to say something about the sequence, so it could say it may
be used. In 802.11ba we had an appendix for recommendations for implementation aspects that were recommended but not required.
Regards,
Steve
From: Nelson Costa <nelson@xxxxxxxx>
Sent: Wednesday, March 11, 2026 2:46 PM
To: Steve Shellhammer <sshellha@xxxxxxxxxxxxxxxx>
Cc: STDS-802-11-TGBP@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBP] 答复: [STDS-802-11-TGBP] SFD SP request
WARNING:
This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros.
Hi Steve,
Thanks for your question. Yes, my intent is to make this the recommended excitation waveform in the draft for use in bistatic backscatter.
Can you explain why you think defining the sequence is vague?
Cheers,
Nelson.
On Wed, Mar 11, 2026 at 5:41 PM Steve Shellhammer <sshellha@xxxxxxxxxxxxxxxx> wrote:
Nelson,
Is your intent to have this OFDM sequence recommended in the Draft? If I understand it the plan is to not make it mandatory. Defining the sequence is a little vague.
Regards,
Steve
From: Nelson Costa <nelson@xxxxxxxx>
Sent: Wednesday, March 11, 2026 12:31 PM
To: STDS-802-11-TGBP@xxxxxxxxxxxxxxxxx
Subject: Re: [STDS-802-11-TGBP] 答复: [STDS-802-11-TGBP] SFD SP request
WARNING: This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros.
Hi Bo,
Please help to queue the following SFD motions:
SP#1
Do you agree add the following to the TGbp SFD?
• 11bp defines one carrier waveform for bistatic backscatter that would be based on the following 64 carrier 20 MHz OFDM symbol.
L[i] = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-1,1,-1,1,-1,1,-1,1,-1,1,-1,1,1,1,-1,-1,0,1,1,1,1,-1,1,-1,-1,1,-1,-1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
• where L contains carriers with indices i ∈ {-32…31} and i = 0 is the DC carrier.
• Note: Following Motion #39, the carrier waveform would consist of the repeated base waveform, multiplied by a pseudo-random phase.
References: 11-25/1228, 11-25/1229, 11-25/2021, 11-26/0018, 11-26/0557
SP#2
Do you agree add the following to the TGbp SFD?
• The delay to account for startup time for the channel shifting clock at the non-AP AMP STA during bistatic backscatter operation shall be no less than 100µs.
References: 11-26/0558
SP#3
Do you agree add the following to the TGbp SFD?
• During a bistatic backscatter frame exchange sequence (or TXOP), the AMP Energizer shall indicate the excitation start time and duration in a downlink frame to the non-AP AMP STA.
References: 11-26/0558
Cheers,
Nelson.
On Wed, Mar 11, 2026 at 1:47 PM qianbin (G) <000026f90ace5529-dmarc-request@xxxxxxxxxxxxxxxxx> wrote:
Hi Bo,
Please help to add the following SFD SP text:
- Do you agree to amend Motion PM-73 in TGbp SFD:
Ø 802.11bp shall specify an upper bound on the transition time from ON to OFF and from OFF to ON of the transmitted waveform by the active non-AP AMP STAs for 250 kbps and 1 Mbps in 2.4 GHz band
• Transition time from ON symbol to OFF symbol is defined as the time for the RF envelope to change from 0.1A to 0.9A. Transition time from OFF symbol to ON symbol is defined as the time for the RF envelope to change from 0.9A to 0.1A.
• Note: A is the steady state RF envelope amplitude of the ON symbol.
• The specified upper bound shall be: ON à OFF transition time
50 ns, and OFF à ON transition time
[Reference: 11-26/0566r1]
- Do you agree to amend Motion PM-74 in TGbp SFD :
Ø 802.11bp shall specify an upper bound and a lower bound on the ratio of ON time duration and OFF time duration of the transmitted waveform by the active non-AP AMP STAs for 250 kbps and 1 Mbps in 2.4 GHz band
• ON time duration is defined as the time interval during which the envelope exceeds 0.9A. OFF time duration is defined as the time interval during which the envelope is below 0.1A.
• Note: A is the steady state RF envelope amplitude of the ON symbol.
• The specified bounds shall be
[Reference: 11-26/0566r1]
Thanks and regards,
Bin
发件人: Ian Bajaj <0000340c29b22c99-dmarc-request@xxxxxxxxxxxxxxxxx>
发送时间: 2026年3月12日 0:59
收件人: STDS-802-11-TGBP@xxxxxxxxxxxxxxxxx
主题: [STDS-802-11-TGBP] SFD SP request
Hi Bo,
Please help to update the following SFD SP text:
SP Set#20 (Update)
SP4
- Do you agree to amend WM-12 in the 802.11bp SFD as:
- IEEE 802.11bp defines the Operation Status field, to carry the transmission time that the non-AP AMP STA can sustain. The Operation Status field shall be carried in the UL frame transmitted in response to a request for the Operation Status from the AMP AP.
- The transmission of an unsolicited report of the Operation Status in response to a unicast AMP Trigger from the AMP AP is
TBDenabled by a control bit in the AMP UL frame, indicating the presence of the Operation Status field following the field(s) carrying the solicited UL in the payload of the AMP UL frame.- The non-AP AMP STAs that cannot support the reporting of the transmission time it can sustain shall not respond to a request for Operation status from the AMP AP
[Reference: 11-25/0788r0, 11-25/1243r0, 11-25/2038r0]
Thanks and Regards
Ian
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