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Hi Mark, Very good job by summarizing all the possible way forward. Really appreciate that. You are correct, Opt C is my preference. And the current description in D6.0 makes people think it as either Opt B or Opt C. And I see no reasons
to force the Tx to puncture one subchannel in P80, which is OptB. From implementation point of view, I should say even Opt B disallows full P80 transmission, the AP can still transmit full P80, and it is transparent to STAs. For Opt D, it changes the meaning of a non-punctured mode. I think it is too much change at this stage. I encourage the group to move forward with Opt C. In that case, we can have a clear description about preamble puncture and with no technical changes
at this stage. All further comments are welcome. regards 于健 Ross Yu Huawei Technologies 发件人: *** 802.11 TGax - HEW - High Efficiency WLAN *** [mailto:STDS-802-11-TGAX@xxxxxxxxxxxxxxxxx]
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Mark RISON I'm mildly confused, because on re-reading SP4 I think it does not allow
the "xx-x" pattern in S80 someone mentioned last week (I forget whom
now); I really have to stretch the interpretation of the bullet to make it possible. Anyway, I've attempted to capture a smörgåsbord of puncturing options for the group to consider. I am only presenting the HE-SIG-A wording; the ~46 other places in which the preamble puncturing options are described would of course be aligned with this once we agree on something. I am not showing change tracking w.r.t. D6.0 because I don’t think it’s useful at this point anymore (it would be mostly underlines and strikethroughs!).
Option A: based on the SPs that had a reasonably conclusive
outcome as captured in the agenda (20/0538r13), with my interpretation shown: SP1) For 160M/80+80M, should having all the 20M subchannels in the secondary 80M channel punctured be allowed? Y/N/A = 0/23/6
[my interpretation: no, not allowed] SP3) For 160M/80+80M, should D6.0 be interpreted as allowing having no 20M subchannels in the primary 80 MHz channel
punctured (only in the secondary 80 MHz channel)? Y/N/A = 6/9/18
[my interpretation: no, nowhere near enough support to allow this] SP4) Do you agree that for 160M/80+80M, allow only a maximum of two adjacent 20 MHz subchannels to be punctured? •
When puncturing 40 MHz in secondary 80, only puncturing either the lower 40 MHz or the upper 40 MHz Y/N/A = 19/5/8
[my interpretation: yes, only allow max 2, but maybe two possible interpretations of bullet; see below] Option A1: interpret bullet as saying “if you puncture
two in the S80, it has to be either the lower 40 or the upper 40; you can’t puncture the other one at all”: Table 27-20—HE-SIG-A field of an HE MU PPDU, Bandwidth field Set to 4 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is the secondary 20 MHz channel. Set to 5 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is one of the two 20 MHz subchannels in the secondary 40 MHz
channel. Set to 6 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are the secondary 20 MHz channel and zero to
two of the 20 MHz subchannels in the secondary 80 MHz channel. If two of the 20 MHz subchannels in the secondary 80 MHz channel are punctured, these are either the lower two or the higher two. No more than two adjacent 20 MHz subchannels are punctured across
160 MHz. Set to 7 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are one or both of the 20 MHz subchannels in
the secondary 40 MHz channel and zero to two of the 20 MHz subchannels in the secondary 80 MHz channel. If two of the 20 MHz subchannels in the secondary 80 MHz channel are punctured, these are either the lower two or the higher two. No more than two adjacent
20 MHz subchannels are punctured across 160 MHz. Option A2: interpret bullet as saying “if you puncture
one of the 40s in the S80, you can’t entirely puncture the other one but you can puncture a 20 in it” (note: I don’t believe this is a valid interpretation, because we’d already agreed that we couldn’t puncture the entire S80, if that was all the bullet was
saying, there was no need to say it at all): Table 27-20—HE-SIG-A field of an HE MU PPDU, Bandwidth field Set to 4 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is the secondary 20 MHz channel. Set to 5 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is one of the two 20 MHz subchannels in the secondary 40 MHz
channel. Set to 6 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are the secondary 20 MHz channel and zero to
three of the 20 MHz subchannels in the secondary 80 MHz channel. No more than two adjacent 20 MHz subchannels are punctured across 160 MHz
or 80+80 MHz. Set to 7 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are one or both of the 20 MHz subchannels in
the secondary 40 MHz channel and zero to three of the 20 MHz subchannels in the secondary 80 MHz channel. No more than two adjacent 20 MHz subchannels are punctured across 160 MHz
or 80+80 MHz. Option B: ignore SP4 and instead allow >2 adjacent 20M
subchannels to be punctured (note: I think this is closest to the direction in D6.0, since it has no such adjacency restriction) Table 27-20—HE-SIG-A field of an HE MU PPDU, Bandwidth field Set to 4 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is the secondary 20 MHz channel. Set to 5 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is one of the two 20 MHz subchannels in the secondary 40 MHz
channel. Set to 6 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are the secondary 20 MHz channel and zero to
three of the 20 MHz subchannels in the secondary 80 MHz channel. Set to 7 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are one or both of the 20 MHz subchannels in
the secondary 40 MHz channel and zero to three of the 20 MHz subchannels in the secondary 80 MHz channel. Option C: ignore SP3 and SP4 and instead allow P80 not
to be punctured at all and allow >2 adjacent channels to be punctured (note: I think this is Ross’s preference; it does however mean receivers are potentially falsely directed to not attempt to receive a content channel on some 20 MHz subchannels) Table 27-20—HE-SIG-A field of an HE MU PPDU, Bandwidth field Set to 4 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is the secondary 20 MHz channel. Set to 5 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is one of the two 20 MHz subchannels in the secondary 40 MHz
channel. Set to 6 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are the secondary 20 MHz channel and zero to
three of the 20 MHz subchannels in the secondary 80 MHz channel. Set to 7 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are
zero, one or both of the 20 MHz subchannels in the secondary 40 MHz channel and zero to three of the 20 MHz subchannels in the secondary 80 MHz channel
(but at least one if no 20 MHz subchannel was punctured in the secondary 40 MHz channel). Option D: same as option A1, except that allow puncturing
in S80 but not P80 by extending the definition of 3 (note: this is a way to address Ross’s concern about being forced to puncture a 20M in P80 if actually all you want to do is puncture in S80; it does however potentially cause problems with implementations
that assume they can process content channels in S80 in “case 3”) Table 27-20—HE-SIG-A field of an HE MU PPDU, Bandwidth field Set to 3 for 160 MHz and 80+80 MHz non-preamble puncturing mode,
or for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured channels are one or two of the 20 MHz subchannels in the secondary 80 MHz channel. If two of the 20 MHz subchannels in the secondary
80 MHz channel are punctured, these are either the lower two or the higher two. Set to 4 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is the secondary 20 MHz channel. Set to 5 for preamble puncturing in 80 MHz, where in the preamble the only punctured subchannel is one of the two 20 MHz subchannels in the secondary 40 MHz
channel. Set to 6 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are the secondary 20 MHz channel and zero to
two of the 20 MHz subchannels in the secondary 80 MHz channel. If two of the 20 MHz subchannels in the secondary 80 MHz channel are punctured, these are either the lower two or the higher two. No more than two adjacent 20 MHz subchannels are punctured across
160 MHz. Set to 7 for preamble puncturing in 160 MHz or 80+80 MHz, where in the preamble the only punctured subchannels are one or both of the 20 MHz subchannels in
the secondary 40 MHz channel and zero to two of the 20 MHz subchannels in the secondary 80 MHz channel. If two of the 20 MHz subchannels in the secondary 80 MHz channel are punctured, these are either the lower two or the higher two. No more than two adjacent
20 MHz subchannels are punctured across 160 MHz. Thanks, Mark --
Mark RISON, Standards Architect, WLAN English/Esperanto/Français Samsung Cambridge Solution Centre Tel: +44 1223 434600 Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601 ROYAUME UNI WWW:
http://www.samsung.com/uk
On Thu, 9 Apr 2020 at 18:41, Mark RISON <m.rison@xxxxxxxxxxx> wrote:
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