IEEE P802.11 Wireless LANs Rx Procedure Comment Resolution for LB 178 D1.0 Date: 20 July 2011 Author(s): Name Affiliation Address Phone email Perahia Corporation eldad.perahia@intel.com CID Page Clause Comment Proposed Change Resn Status Resolution 2934 192.00 22.3.21 L-SIG parity bit is known to exhibit high false-positive rate. The validity of the packet should not be based on this single parity bit. There are several possible solutions to this problem, 2 of which are mentioned here: 1) Expand the CRC in VHT-SIG-A2 to include the Length field of L-SIG. 2) Defer the checking of the parity bit until field is decoded the perform the check by comparing the L-SIG Length with VHT-SIG-B Length. D Disagree. With improved RF and better receiver sensitivity, issues with the single parity bit of the L-SIG as in the days of 802.11a are much reduced. Furthermore, even back in the 11n development days, extra information was used to verify L-SIG, such as validity of the L-SIG rate (see CID Page Clause Comment Proposed Change Resn Status Resolution
CID Page Clause Comment Proposed Change Resn Status Resolution 2499 192.45 22.3.21 "value of 63" but this is now 0 or 63 according to AP/non-AP. Ditto P192L52 e.g. "has a value indicating a SU transmission (see xxx)" A Agree. See resolution in 11/0987. 2705 192.45 22.3.21 Group ID 0 is also SU. Change 'value of 63' to 'value of 0 or 63' P Agree in principle. See resolution in 11/0987. 3164 192.45 22.3.21 Group ID = 0 is also SU change "If the received Group ID in VHT-SIG-A has a value of 0 or 63 (indicating a SU transmission), the PHY entity may choose not to decode VHT-SIG-B." to "If the received Group ID in VHT-SIG-A has a value of 63 (indicating a SU transmission), the PHY entity may choose not to decode P Agree in principle. See resolution in 11/0987. 3688 192.45 22.3.21 Missing the value 0 in "If the received Group ID in VHT-SIG-A has a value of 63 (indicating a SU transmission)" Change to "If the received Group ID in VHT-SIG-A has a value of 0 or 63 (indicating a SU transmission)" P Agree in principle. See resolution in 11/0987. 3368 192.46 22.3.21 Doesn't 0 also indicate an SU transmission? Change "63" to "0 or 63" P Agree in principle. See resolution in 11/0987. 2706 192.51 22.3.21 Group ID 0 is also SU. Change 'value other than 63' to 'value other than 0 or 63' P Agree in principle. See resolution in 11/0987. 3165 192.51 22.3.21 Requirement to decode only if STA supports In addition, Group ID = 0 is also SU. change "If Group ID in VHT-SIG-A has a value other than 63 (indicating a MU transmission), the PHY shall decode to "If the VHT STA supports MU-MIMO P Agree in principle. See resolution in 11/0987.
"N_symbols" , respectively. actually confuse people into thinking that these are the same parameters. 2975 195.51 22.3.21 Figure 22-24 does not give the initial value of "N_symbols" (the number of data symbols), while Figure 22-22 does. Provide the initial value of "N_symbols" A Agree. See resolution in 11/0987. 3012 195.51 22.3.21 Figure 22-24 does not give the initial value of "N_symbols" (the number of data symbols), while Figure 22-22 does. Give the initial value of "N_symbols" A Agree. See resolution in 11/0987. TGac editor: modify D1.0 Figure 22-24, as follows