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Youhan and Xiaogang, Xiaogang, thanks for bringing up this point. If B0 is zero, then Extra LTFs are not supported. So setting B3-B4 to 0, which is used to indicate a max of 4 LTFs, is not correct. I agree with Youhan, that making those bit Reserved is correct. If we do that, the B3-B4 does not have any impact on the number of supported LTFs, which I believe fixes the issue brought up by Xiaogang. Xiaogang, do you agree that making them reserved solves this issue? Regards, Steve From: Youhan Kim <youhank@xxxxxxxxxxxxxxxx> CAUTION: This email originated from outside of
the organization. How about “If B0 is set to 0 then B3 and B4 are both reserved”? Thanks. Youhan From: Chen, Xiaogang C <xiaogang.c.chen@xxxxxxxxx>
CAUTION: This email originated from outside of
the organization. Sorry Steve, one more question regarding the B3B4 setting. If non-AP STA doesn’t support extra LTF, the text below means it can only support up to 4 LTF in sounding / MUMIMO and OFDMA? e.g. If AP has 8 antennas this STA can even not be
fully sounded because it only receive up to 4 LTF (B0 = 0)? If that’s the correct understanding, I think we need to decouple B0 and B3,B4.
If B0 is set to 0 then B3 and B4 are both set to 0. BRs, Xiaogang. From: Chen, Xiaogang C <xiaogang.c.chen@xxxxxxxxx>
Hi Steve, Regarding the text below, if a non-AP STA is capable of receive 2 SS and don’t support extra LTF reception (B0 = 0), then B1B2 set to 0 means it can still receive 4 LTF in single user transmission. So AP can still transmit 4 LTF where 2
out of the 4 LTF are extra. I guess it’s not a correct interpretation right? If B0 is set to 0 then B1 and B2 are both set to 0. BRs, Xiaogang. From: Steve Shellhammer <sshellha@xxxxxxxxxxxxxxxx>
Ross, You bring up a good point. I have revised the document (now 755r1), and dropped the text on “non-OFDMA” in the description of bits B3-B4. Thanks for reminding me of that motion. Regards, Steve From: Yujian (Ross Yu) <ross.yujian@xxxxxxxxxx>
CAUTION: This email originated from outside of
the organization. Hi Steve, Then how about the OFDMA case?
We have the following motion: The allowed values of maximum NLTF receive capability for multiple-user transmission are 4, 8, and 16.
[Motion 141, #SP261, [3] and [52]] regards 于健
Ross Jian Yu Huawei Technologies 发件人:
Steve Shellhammer [mailto:sshellha@xxxxxxxxxxxxxxxx]
Hi Ross, It is my understanding that this Extra LTF PHY Capability is for the non-OFDMA mode. As you can see B0 indicates support for this feature, where it is clear that it is for the non-OFDMA case. That is why we are providing
clarifying text. The main point of the edits is to clarify this is a receiver capability, which was unclear in the original text. I hope this addresses your comment. Regards, Steve From: Yujian (Ross Yu) <ross.yujian@xxxxxxxxxx>
CAUTION: This email originated from outside of
the organization. Hi Steve, B3-B4 previously covers OFDMA case, which is the case in 11ax. For OFDMA case, it indicates 8 or same as Beamformee NSTS capability. regards 于健 Ross Jian Yu Huawei Technologies 发件人:
Steve Shellhammer [mailto:sshellha@xxxxxxxxxxxxxxxx]
Alfred, Sigurd, and Tianyu, Please add the following PDT to the PHY Agenda,
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