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VHT-SIG-A and VHT-SIG-B Field Structure

VHT-SIG-A and VHT-SIG-B Field Structure. Authors:. Date: 2010-09-09. Introduction. Fields for VHT-SIG-A and VHT-SIG-B were accepted in the 11ac spec framework 992r13 This presentation defines the order of these fields and some bit widths that were not fixed yet in 992r13.

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VHT-SIG-A and VHT-SIG-B Field Structure

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  1. VHT-SIG-A and VHT-SIG-B Field Structure Authors: Date: 2010-09-09 Richard van Nee, Qualcomm

  2. Introduction • Fields for VHT-SIG-A and VHT-SIG-B were accepted in the 11ac spec framework 992r13 • This presentation defines the order of these fields and some bit widths that were not fixed yet in 992r13 Richard van Nee, Qualcomm

  3. VHT-SIG-A/B Structure • For ease of parsing, the common fields between SU and MU are scheduled first • All fields are transmitted LSB first, like in 11n • Fields are transmitted in order listed in the following tables with top of table transmitted first in time Richard van Nee, Qualcomm

  4. Notes on Field Changes • Group ID of all ones (instead of all zeros) signals SU/Broadcast/Multicast • Prevents large peak-to-average power ratio in VHT-SIG-A • With all zeros Group ID, there would be 21 zeros and just 3 ones in VHT-SIG-A1 for a 20 MHz single stream Broadcast/Multicast packet with no STBC • SU Beamforming bit added in VHT-SIG-A • MU beamforming is signaled through Group ID • Notice that TGac voted to not have a smoothing bit in large part due to the complexity in 20.3.11.10.1 in determining when the bit should be set • However, it is still useful to provide the receiver basic information that the SU transmitted waveform is beamformed • Therefore this bit is set simply if a beamforming steering matrix is applied to the waveform in an SU transmission Richard van Nee, Qualcomm

  5. VHT-SIG-A1 Fields and Order * Text in red indicates changes/additions relative to 992r13 Richard van Nee, Qualcomm

  6. VHT-SIG-A2 Fields and Order Richard van Nee, Qualcomm

  7. VHT-SIG-B Fields and Order • Order of transmission: Length, MCS (in case of MU) / Reserved (in case of SU), Tail • Fields are transmitted LSB first Richard van Nee, Qualcomm

  8. Bit Allocation of CRC in SERVICE Field • CRC of VHT-SIG-B bits excluding tail bits is calculated as in 11n Section 20.3.9.4.4. • As in 11n, C7 is transmitted first. So C7 is mapped to B8 of the SERVICE field, C6 is mapped to B9, …, C0 is mapped to B15 of the SERVICE field. Richard van Nee, Qualcomm

  9. Straw Poll • Do you support adding the VHT-SIG-A/B and VHT-SIG-B CRC structure from slides 3-8 to the specification framework document, 11-09/0992? Richard van Nee, Qualcomm

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