July 2012 doc IEEE 802 11 120832 r

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 SIG Fields Design of Long Preamble Authors: Submission Date: 2012 -07 -12 Slide 1 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Authors: Submission Slide 2 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Authors: Submission Slide 3 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Motivation • In IEEE 802. 11 TGah meeting, the preamble names has been changed from SU/MU preamble to Short/Long preamble • However, SIG fields table (R. 3. 2. 1. 1. E ) has not been correctly updated • Because TGah supports three preamble formats for >=2 MHz PHY, SIG field table also should be updated with three SIG field columns Submission Slide 4 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Proposal for R. 3. 2. 1. 1. E. 1 Length / Duration MCS BW Aggregation STBC Coding SGI GID Nsts PAID Ack Indication Reserved CRC Tail Total Submission SU 9 4 2 1 1 2 9 2 5 4 6 48 MU 9 2 1 5 1 6 8 2 4 4 6 48 Short preamble SU SU/MU Indication Length / Duration 9 MCS 4 BW 2 Aggregation 1 STBC 1 Coding 2 SGI 1 GID Nsts 2 PAID 9 Ack Indication 2 Smoothing 1 Beam-change Indication Reserved 4 CRC 4 Tail 6 Total 48 Slide 5 Long preamble SU MU 1 1 9 9 4 2 2 1 1 1 2 5 1 1 6 2 8 9 2 2 1 3 4 6 48 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Proposal for R. 3. 2. 1. 1. E. 1 • Changes - Smoothing/Bean-change Indication field is included in SIGA [1] SU/MU Indication field is used in Long preamble for indicating the SU/MU frame type Submission Slide 6 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Definition of SIG-B • SIG-B is used in the long preamble to convey the MCS information for MU-MIMO transmission (different MCS for different users). • We propose to re-define this symbol for SU transmission as an exact repetition of D-LTF 1. This will enable improved channel estimation for the important cases of SU beamforming or open loop with one spatial stream (and to a lesser extent multiple streams). BW MCS Tail CRC Reserved Total 2 MHz 4 6 8 8 26 Submission 4 MHz 4 6 8 9 27 <MU> BW 8 MHz 4 6 8 11 29 16 MHz 4 6 8 11 29 Reserved Total Slide 7 2 MHz 26 26 4 MHz 27 27 <SU> 8 MHz 29 29 16 MHz 29 29 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Definition of SIG-B • Proposals - - - Submission R. 3. 2. 1. 1. E bullet 2: replace “ 2 MHz SIGB (long preamble)” with “For MU-MIMO transmission the 2 MHz SIGB content is as shown in the following table. For SU-MIMO transmission the SIGB symbol is identical to D-LTF 1. ” R. 3. 2. A bullet 4: replace the sentence starting with “n=0, 1, 2, …is the symbol index” with “n=0, 1, 2, …is the symbol index, continuously counted from the 1 st Data symbol for short preamble and long preamble when in SU mode, and from SIGB for long preamble when in MU mode” R. 3. 2. 1. D: The draft specification shall use the 4 LSB of the 11 n HTSIG field 8 -bit CRC for the 4 -bit CRC in 11 ah 2 MHz and 1 MHz SIG(A) fields, and use the same 11 n HTSIG field 8 -bit CRC in SIGB field of the >=2 MHz long preamble when in MU mode Slide 8 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 References [1] IEEE 802. 11 -12/0825 r 0, Smoothing bit and beam_change indication bit Submission Slide 9 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Straw Poll 1 • Do you support the following SIGA fields design for >= 2 MHz PHY? Submission Short preamble SU/MU Indication Length / Duration MCS BW Aggregation STBC Coding SGI GID Nsts PAID Ack Indication Smoothing Beam-change Indication Reserved CRC Tail Total Slide 10 Long preamble SU 9 4 2 1 1 2 1 SU 1 9 4 2 1 1 2 1 MU 1 9 2 1 2 9 2 - 4 4 6 48 1 3 4 6 48 2 1 5 1 6 8 Yongho Seok, LG Electronics

July 2012 doc. : IEEE 802. 11 -12/0832 r 2 Straw Poll 2 • Do you support the following modification of SIGB fields for >= 2 MHz PHY? - - - Submission R. 3. 2. 1. 1. E bullet 2: replace “ 2 MHz SIGB (long preamble)” with “For MU -MIMO transmission the 2 MHz SIGB content is as shown in the following table. For SU-MIMO transmission the SIGB symbol is identical to D-LTF 1. ” R. 3. 2. A bullet 4: replace the sentence starting with “n=0, 1, 2, …is the symbol index” with “n=0, 1, 2, …is the symbol index, continuously counted from the 1 st Data symbol for short preamble and long preamble when in SU mode, and from SIGB for long preamble when in MU mode” R. 3. 2. 1. D: The draft specification shall use the 4 LSB of the 11 n HTSIG field 8 -bit CRC for the 4 -bit CRC in 11 ah 2 MHz and 1 MHz SIG(A) fields, and use the same 11 n HTSIG field 8 -bit CRC in SIGB field of the >=2 MHz long preamble when in MU mode Slide 11 Yongho Seok, LG Electronics