Link Adaptation Subfield for VHT May 2010 doc.: IEEE 802.11-10/0570r0 September 2010 Link Adaptation Subfield for VHT Date: 2010-09-12 Authors: Matthew Fischer, Broadcom Sameer Vermani, Qualcomm
Link Adaptation (LA) Subfield September 2010 Link Adaptation (LA) Subfield HTC field contains the Link Adaptation subfield Link Adaptation field contains Training Request, MCS Feedback Request and MCS FB ID, and Antenna selection information When used for MCS Feedback Format of field fits 802.11n MCS values Confusion when using Tgac MCS values TGac proposes overloading MCS values Inability to include Nsts value for Tgac Proposed TGac MCS coding does not include streams Matthew Fischer, Broadcom
Proposed Modification to LA Subfield September 2010 Proposed Modification to LA Subfield Need solution to allow differentiation between HT MCS and VHT MCS plus NSTS in MFB subfield Propose to use Link Adaptation bit 0 which is currently reserved LinkAdaptation[0] == 0 => MFB value is HT MCS LinkAdaptation[0] == 1 => MFB value is VHT MCS (4bits) plus Nsts (3bits) Matthew Fischer, Broadcom
New LA Subfield Current Link Adaptation subfield: September 2010 New LA Subfield Current Link Adaptation subfield: Proposed Link Adaptation subfield: B0 B1 B2 B5 B6 B8 B9 B15 RESV TRQ MAI MFSI MFB/ASELC Bits: 1 1 4 3 7 B0 B1 B2 B5 B6 B8 B9 B15 VHT_MFB TRQ MAI MFSI MFB/ASELC Bits: 1 1 4 3 7 VHT_MCS VHT_NSTS When VHT_MFB=1 : 4 3 Matthew Fischer, Broadcom
September 2010 Strawpoll #1 Do you support a modification of the TGac specification framework document to indicate that the reserved bit 0 of the Link Adaptation Control subfield of the Link Adaptation subfield of the HT Control field is renamed to VHT_MFB and that a value of 1 for the VHT_MFB bit indicates that the value in the MFB subfield of the Link Adaptation Control subfield contains 4 bits of VHT MCS and 3 bits of NSTS, and a value of 0 for the VHT_MFB bit indicates that the value in the MFB subfield of the Link Adaptation Control subfield contains HT MCS feedback? Matthew Fischer, Broadcom