271 Bin Tian 74.02 Inconsistency in HE MU PPDU descrption between "HE MU PPDU format carries one or more PSDUs to one or more users" in 26.1.4 and "This format is used for MU transmission." The HE MU PPDU can be used for SU transmission Change to: the format is used for SU or MU tranmission that is not a response of .. ." Accepted. ax editor: please make the following changes in Clause 26.3.2: On P74L02 (CID #271): Change to: “This format is used for transmission to one or more users that is not a response of a Trigger frame.” CID Commenter Section Page Comment Proposed Change Resolution 836 Jinsoo Choi 26.3.2 75.25 There are some fields with variable size in the Figure 26-5 NDP PPDU format such as (2 symbols or 4 symbols) or HE-STF (1x or 2x), but there is no note or explanation on those fields. It would be better to add some explanation or include the duration of each field in the figure explicitly. Specify the duration of each in Figure 26-5. Revised. Change to as in the resolution of CID836 in doc 883 JUNG HOON SUH 26.3.2 75.33 Need to confirm the description for HE NDP PPDU, NOTE 2 Change to: “There is only one HE-LTF mode for NDP packet” Revised. Change to as in the resolution of CID883 in doc 884 JUNG HOON SUH 26.3.2 75.35 Need to confirm the description for HE NDP PPDU, NOTE 3 Change to: " T_HE-LTF-2X is the only symbol length for NDP PPDU” Revised. Change to as in the resolution of CID884 in doc 1930 Sigurd Schelstraete 26.3.2 75.37 "The presence and duration of PE are TBD" The reason for PE does not appear to apply for sounding packet. Remove PE. Rejected. PE gives the beamformees sufficient time to prepare extensive feedbacks after receiving sounding NDP PPDU. Refer to
PHY motion #147. 2247 Vincent Knowles IV Jones 26.3.2 75.15 The GI for an NDP should be the maximum length GI. The maximum length GI will provide the best fidelity of channel measurement, and since there are very few GI in an entire NDP PPDU, there isn't too much overhead for selecting the max GI Define a GI for the HE NDP. Define it to be the maximum GI length. Rejected. 11ax spec framework specifies that mandatory GI value for NDP is either 1.6uS or 0.8uS. This decision is made after many discussions. Maximum GI value is applied only when HELTF-4x sequence is used in NDP PPDU in spec framework, which is an optional mode. Discussion: The commenters are right that HE-LTF mode and PE duration for HE NDP PPDU should be explicitly specified as in ax spec framework. The commenters are right that duration of each field in Figure 26-5 need to be specified. On P75L25 (CID #836): Figure 26-5 is modified as suggested. ax editor: please make the following changes in Clause 26.3.2: Figure 26-5—HE NDP PPDU format On P75L33 (CID #883): ax editor: please make the following changes in Clause 26.3.2: The HE NDP PPDU has the following properties: —It uses the HE SU PPDU format but without the Data field —2X HE-LTF is the only mandatory mode for NDP. 4X HE-LTF is optional mode for NDP. —PE is always present in a NDP PPDU, with a duration of 4uS. —NDP PPDU uses either of the mandatory GI values (1.6uS or 0.8uS). GI shall be set to 3.2uS if 4X HE-LTF sequence is used for NDP PPDU. On P75L35 (CID #884): Refer to resolution of CID #883.
CID Commenter Section Page Comment Proposed Change Resolution 292 Bin Tian 101.13 Why use signficant different math equations to describe L-LTFwaveform from thoise I previous amendments? For example, Eq 26-12 is different from 22-20 in VHT section. In Eq the T_GI_legacypreamble term shall be removed. Use the same equations and to describe the as in previous amendents. Only make necessary changes to the reflect the delta introudced in 11ax like boosting and beam_change=0 case. Rejected. The reason that the equation becomes much different is to handle the HE_TRIG PPDU preamble, in which preambles are only transmitted on the same 20MHz channels where data are transmitted. CID Commenter Section Page Comment Proposed Change Resolution 525 Dong Guk Lim 103.35 we agreed that the same power per tone as L-LTF is applied in L-SIG, RL-SIG, HE-SIG-A and HE-SIG-B fields. But, in D0.1, it does not applied yet. So, It should be applied in description/ equation of L-SIG, HE-SIG-A and fields add the text and field based on the PHY Motion #144 in IEEE Revised. Change to as in the resolution of CID525 in doc 904 Junghoon Suh 101.49 The first column of Q matrix is always used in Eqn (26-14) in -->m should be 0? Because the 1st column of Q matrix is always used here, and N_STS,total is always 1 Revised. Change to as in the resolution of CID904 in doc 906 Junghoon Suh 102.33 The first column of Q matrix is always used in Eqn (26-16) in -->m should be 0? Because the 1st column of Q matrix is always used here, and N_STS,total is always 1 Revised. Change to as in the resolution of CID906 in doc STF, 3
doc Discussions: The commentor is right that reference table indices are not correct. ax editor: please make the following changes in Clause 26.3.9.3: On P101L40 (CID #1988): Change L40 to has the value given in Table 26-1322-8 (Tone scaling factor and guard interval duration values for PHY fields(11ac)HE PPDU fields). On P102L24 (CID #1994): Change L24 to has the given in Table 26-1322-8 (Tone scaling factor and guard interval duration values for PHY fields(11ac)HE PPDU fields). Additional Changes to Table 26-13 are highlighted in “Yellow”. Field as a function of bandwidth, and RU size per frequency segment Guard interval duration 20 MHz 40 MHz 80 MHz 160 MHz L-STF 12 24 48 96 - L-LTF 52 104 208 416 TGI2,Data L-SIG (in HE PPDU) 56 112 224 448 TGI,LegacyPreamble L-SIG (in NON_HT_DUP) - 104 208 416 RL-SIG 56 112 224 448 TGI,LegacyPreamble HE-SIG-A 56 112 224 448 TGI,LegacyPreamble HE-SIG-B 56 112 224 448 TGI,LegacyPreamble HE-STF not in HE_TRIG 14 30 62 126 - HE-STF in HE_TRIG 30 60 124 248 - HE-LTF 1x Duration 60 122 250 500 TGI,HE-LTF1 HE-LTF 2x Duration 122 242 498 996 TGI,HE-LTF2 HE-LTF 4x Duration 242 484 996 1992 TGI,HE-LTF4 HE-Data 242 484 996 1992 TGI,Data or TGI2,Data or TGI4,Data