IEEE P802.11 Wireless LANs TGah D1.0 LB200 Comment Resolutions on Section 24.3.8 S1G Preamble Date: 2014-01-20 Author(s): Name Affiliation Address Phone Eugene Baik Qualcomm Technologies, Inc. 5775 Morehouse Dr. San Diego, CA 92122 858-658-2568 eugeneb@qti.qualcomm.com Abstract: This document contains proposed resolutions for the following CIDs from LB200 of TGah D1.0: Clause 24.3.8: 1318 1319 1320 1321 1322 1323 1324 1567 1568 1572 1610 1611 1612 1613 1614 1761 1762 1765 1766 1767 1768 1769 1770 1782 1783 2005 2073 2074 2092 2171 2281 2694 2695 CIDs for Clause 24.3.8
CID Section Page. Line Comment Proposed Change Resolution 1318 Adrian Stephens 24.3.8.2 283.28 "Greater than or equal to 2MHz PHY" I don't think Clause 24 defines multiple PHYs. It defines a single PHY with multiple formats. Change title to relate to PPDU format. Accept. See reproduced text for applied changes. 1319 Adrian Stephens 287.53 "NOTE--Integer fields are represented in unsigned binary format with the least significant bit in the lowest numbered bit position." This should not be a note, because this information is necessary for interoperability. Promote to body text. Accept. See reproduced text below for applied changes. 1320 Adrian Stephens 289.05 - terminology Replace all "AMPDU" with "A-MPDU" Accept. See reproduced text below for applied changes. 1321 Adrian Stephens 291.19 The "0" dots in figure 24-28 have drooped. Raise them up. Ditto at 300.57 on the left. Accept. See reproduced text below for applied changes. 1322 Adrian Stephens 292.38 " long preamble is always single user modulated" -- the 'reassurance' given by "always" is unnecessary. " long preamble is single user modulated. Accept. See reproduced text below for applied changes. 1323 Adrian Stephens 295.65 More red text make it black Accept. See reproduced text below for applied changes. 1324 Adrian Stephens 309.01 Notes within a subclause are numbered consecutively. Change previous note to "NOTE 1<em-dash>", and this one to "NOTE Review all NOTEs in the draft and ensure any multiples within the same subclause are numbered. Accept. See reproduced text below for applied changes.
1567 Bo Sun 284.32 the expain of NSR is missing chang to NSR is defined Table (Timing-related constants) Accept. See reproduced text below for applied changes. 1568 Bo Sun 284.32 the parameter of Qk is not defined in equation (24-13), also missing in the time domain representation of other signal of preamble. add the definition of Qk under formula that uses Qk throughout the spec Accept. See reproduced text below for applied changes. 1572 Bo Sun 311.35 For 1MHz PPDU, the roatation of SIG symbols makes no sense. For example, in 11ac, the rotation is used to distinguish VHT format from HT format. In S1G 2MHz PPDU, the rotation is used to distinguish short preamble from long preamble. Delete the term "rotated" in this section Accept. See reproduced text below for applied changes. 1610 Brian Hart 287.56 "The SIG field is composed of two OFDM symbols, SIG-1 and SIG-2, each containing 24 data bits, as shown in Table 24-11" Due to BCC encoding the end data bits in SIG1 are spread into SIG2, so not correct to say "each containing 24 data bits" Instead talk about first part and second part containing 48 bits total ... (see 11ac for the template) Accept. See reproduced text below for applied changes. 1611 Brian Hart 287.31 "reserved" is lowercase Reserved Accept. See reproduced text below for applied changes. 1612 Hart 288.26 UPLINK - is the is the TXVECTOR parameter or the SIG field? Be specific. Better lowercase the field name Revise. Rename SIG field entry as Uplink Indication, which will have same value as UPLINK of TXVECTOR 1613 Brian Hart 288.31 "If UPLINK is set to 0, B7-B9 are set to the of the TXVECTOR parameter COLOR and B10-B15 are set to the value of the TXVECTOR parameter Need to reflect this explosion in Fig 24-26/27 Reject. The field ID is properly described in Table 24-11. Description clearly indicates how the bits of the “ID” field in the SIG should be populated. 4
define 11ah-specific LDPC length calculations for 11ah 1770 Eugene Baik 310.18 Coding bits in Table 24-18 define how LDPC codeword lengths are calculated, and reference Section 22.3.10.5.4 of the 11ac spec and Section 20.3.11.6.5 of the 11n spec. These specs assume the Service field length is 16 bits when it is now 8 bits for 11ah. Need to define 11ah-specific LDPC length calculations for 11ah Need to create new section in 11ah spec to specify LDPC length calculations. Coding bit definition should reference this section Reject. Length, Number of symbol (N_sym), and available bits (N_pld) equations in Section 22.3.10.5.5 LDPC coding of 11ac spec are still applicable because number of service bits (N_service) are treated as variable. 1782 Eugene Baik 287.17 The 2MHz short frame SIG definition needs an Uplink indication bit Add a field in the SIG bit map and definitions table for Uplink indication Reject. As of 1.1, the Uplink indication definition has been added. 1783 Eugene Baik 295.01 The 2MHz long SU SIG definition needs an Uplink indication bit Add a field in the SU SIG bit map and definitions table for Uplink indication Reject. As of Draft 1.1, the Uplink indication definition has been added. 2073 Jens Tingleff 285.31 LTF fields in clause 22 are not defined in equations 22-32 and friends. (Those equations are still in the STF part of clause 22.) Figure out correct reference Accept. See reproduced text below for applied changes. 2074 Jens Tingleff 285.42 (Equation 24-14) The dot before the second open square bracket looks like it should be an implied multiplication. Where the baseline (well, clause 22 and 23, specifically - although clause 23 has 'x' a few times) uses dot (not consistent, BTW), it is centered vertically. In clause 24 the dots that there are appear vertically aligned with the base. (also Decide how to write mutiplication in equations Accept. See reproduced text below for applied changes.
The first LTF (LTF1) consists of two periods of the long training symbol, preceded by a double length (16 s) cyclic prefix. The placement of the first and subsequent LTFs in a greater than or equal to 2MHz short format PPDU is shown in Figure 24-20 (S1G greater than or equal to 2 MHz short format). SIG definition The SIG field carries information required to interpret S1G format PPDUs sent with a short preamble. The structure of the SIG field for the fist symbol (SIG-1) is shown in Figure 24-26 (SIG-1 structure) and for the second symbol (SIG-2) is shown in Figure 24-27 (SIG-2 structure). B0 B1 B2 B3 B4 B5 B6 B7 B15 B16 B17 B18 B19 B22 B23 reserved Reserved STBC UPLINK Uplink Indication BW Nsts ID SGI Coding MCS Smoothing SIG-1 structure B0 B1 B9 B10 B11 B12 B13 B14 B17 B18 B23 Aggregation Length Response Indication Doppler NDP Indication CRC Tail SIG-2 structure The SIG field of S1G format PPDUs sent with a short preamble contains the fields listed in Figure 24-26 (SIG-1 structure) and Figure 24-27 (SIG-2 structure).(#872) Fields in the SIG field of short preamble (continued) Symbol Bit Number of bits Description SIG-1 B0 Reserved 1 Reserved. Set to 1. B1 STBC 1 Set to 1 if all spatial streams have space time block coding and set to 0 if no spatial streams has space time block coding.