CID Page Comment Proposed Change Resolution 271 Bin Tian 74.02 Inconsistency in HE MU PPDU descrption between "HE MU PPDU format (HE_MU) 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 .. ." Revised. Change to as in the resolution of CID836 in doc Resolution to CID 271 as Instruction to ax editor: please make the following text changes on P74L01 in Clause 26.3.2: The format of the HE MU PPDU is defined as in Figure 26-2 (HE MU PPDU format).. An HE-SIG-B field is present in this format. CID 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 field 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 Sigurd 26.3.2 75.37 "The presence and duration of PE are TBD" The reason for PE does not appear to apply Rejected. PE gives the beamformees 0 n
for sounding packet. Remove PE. sufficient time to prepare extensive feedbacks after receiving sounding NDP PPDU. Refer to PHY motion #147 in 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. Resolution to CID #836 as below. Instruction to ax editor: please replace Figure 26-5 on P75L25 in Clause 26.3.2 with the following one: Figure 26-5—HE NDP PPDU format Resolution to CID #883/#884 as below. Instruction to ax editor: please make the following text changes on P75L33 in Clause 26.3.2: 224
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. The combination of HE-LTF modes and GI duration is indicated in HE-SIG-A field. —PE is always present in a NDP PPDU, with a duration of 4uS. —NDP PPDU uses either of the GI values (1.6uS or 0.8uS) when use 2X HE-LTF. GI shall be set to 3.2uS if 4X HE-LTF sequence is used for NDP PPDU. On P75L35 (CID #884): to resolution of CID #883. CID Page Comment Proposed Change Resolution 292 Bin Tian 101.13 Why use signficant different math equations to describe L-STF, 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 texts to describe the L-STFand 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. 525 Dong Guk Lim 103.35 we agreed that the same power per tone as L-LTF is applied in 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, RL-SIG, and HE-SIG-B fields add the text and 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 Revised. Change to as in the
should be 0? Because the 1st column of Q matrix is always used here, and N_STS,total is always 1 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 908 Junghoon Suh 104.19 The first column of Q matrix is always used in Eqn (26-19) 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 CID908 in doc 1984 Siguard 101.14 L-STF should only sum over "active" 20 MHz subbands The sum runs over all 20 MHz bandwidths. Following agreement on PHY motion 154, this should be changed. The same aplies to Equations 26-14, 26-15 and 26-16 Revised. Change to as in the resolution of CID1984 in doc 1990 Siguard 101.49 T_Cs,HE(n) is not used in Equation (26-14) See comment Revised. Change to as in the resolution of CID1990 in doc 1995 Siguard 102.44 T_Cs,HE(n) is not used in Equation (26-16) See comment Revised. Change to as in the resolution of CID1995 in doc 2748 yujin noh 117.31 Per user field content potentially contains too many zeros during transmission. This may cause PAPR of SIG-B Revised Change to as in the resolution of CID1995 in
The cyclic prefix used for HE-SIG-B be 0.8 μs. The number of symbols in HE-SIG-B, denoted by NSYM,HE-SIG-B, shall be signaled in HE-SIG-A in the default mode (see Section 25.3.9.2.4). For the cth content channel (c = 1 or 2), denote the sample on the kth subcarrier of the nth symbol by dk,n,c . The time domain waveform for the HE-SIG-B follows Equation (2625). Instruction to ax editor: please replace equation (26-25) in Clause 26.3.9.8.3 with the following one: (2625) Instruction to ax editor: please make the following changes on P114/L8 in Clause 26.3.9.8.3: where CID Page Comment Proposed Change Resolution 293 Bin Tian 101.38 Gamma_k,BW is defined in Table 26-14 and following Equations with mostly TBDs. But in the application of this varible, it points to section 22 (11ac spec) as its reference. The same problem appears in the descriptions os many pre-HE modulated fields, like L-STF, L-LTF, ... Redefining Gamma_k,BW not necessary unless we have different values from legacy. Suggest to remove the definition of Gamma_k,BW for 11ax and replace it by simple statement of using legacy definition and value for this varible Revised. Change to as in the resolution of CID293 in doc 1987 Siguard 101.38 Defintion of Gamma_k,BW contradicts statement on page 100. Page 100 states that the values are determined by 26-10 and Revised. Change to as in the resolution of CID1987 in doc 1993 Siguard 102.22 Defintion of Gamma_k,BW contradicts statement on page 100. Page 100 states that the values are determined by 26-10 and Revised. Change to as in the resolution of CID1993 in doc Resolution to CID #293/#1987/#1993 as follows.
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 56 - 112 104 224 208 448 416 NOTE--in the case of an HE OFDMA PPDU, the value of HE-STF, HE-LTF and HE-Data fields is variable, and is determined by which RUs of the current full bandwidth are transmitted in the PPDU. CID Page Comment Proposed Change Resolution 1985 Siguard 101.18 S_k,20 is not defined in (26-12) see comment Revised. Change to as in the resolution of CID1985 in doc 1989 Siguard 101.54 S_k,20 is not defined in (26-14) see comment Revised. Change to as in the resolution of CID1989 in doc 1058 Ke Yao 103.26 extra tones are regarded as an extension of L-LTF used to improve channel estimations for a lager band SIG. we don't need to specify them as BPSK modulated tones. suggest to change "Extra 4 BPSK modulated tones " to be "Extra 4 tones " Rejected. The extra 4 tones are defined as BPSK and the values are specified in the following sentence. It is better to make it clear.
has the value given in . CID Page Comment Proposed Change Resolution 1412 Mark 103.07 Using m=1 or m=2 may cause existing devices to consider L-SIG corrupt and ignore it (just like some existing devices do for a Length greater than 2304), losing the CCA protection for the duration of the PPDU Do not try to signal new stuff in the Length. Instead signal the format in Rejected. Using m= 1 or m= 2 will not cause existing devices to consider corrupt and ignore it. 11n or 11ac device will interpret the packet as an 11a PPDU once it determines the length is not divisible by 3, and back off based on the duration indicated by this length. 11a device will decode the packet as an 11a PPDU and back off once it cannot correctly decode the packet. 1195 Lei 103.07 Regarding the length subfield in L-SIG field, m = 1 should be for an HE SU PPDU or HE trigger based PPDU and m =2 should be for an HE MU PPDU or HE change "m is 1 for an HE MU PPDU and HE extended range SU PPDU, and 2 otherwise" to "m is 1 for an HE SU PPDU and HE trigger based PPDU, and 2 otherwise" Rejected. As described in PHY motion 69, “If the length subfield in L-SIG field