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Link Adaptation Subfield for VHT

Link Adaptation Subfield for VHT. Authors:. Date: 2010-09-12. 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

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Link Adaptation Subfield for VHT

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  1. Link Adaptation Subfield for VHT Authors: Date: 2010-09-12 Matthew Fischer, Broadcom

  2. 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

  3. 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

  4. 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 7 Bits: 1 1 4 3 VHT_MCS VHT_NSTS When VHT_MFB=1 : 4 3 Matthew Fischer, Broadcom

  5. 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

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