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SIG Fields Design of Long Preamble

SIG Fields Design of Long Preamble. Authors:. Date: 2012-07-12. Authors:. Authors:. 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

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SIG Fields Design of Long Preamble

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  1. SIG Fields Design of Long Preamble Authors: Date: 2012-07-12 YonghoSeok, LG Electronics

  2. Authors: Yongho Seok, LG Electronics

  3. Authors: Yongho Seok, LG Electronics

  4. 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 Yongho Seok, LG Electronics

  5. Proposal for R.3.2.1.1.E.1 Yongho Seok, LG Electronics

  6. 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 Yongho Seok, LG Electronics

  7. 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-LTF1. 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). <SU> <MU> Yongho Seok, LG Electronics

  8. Definition of SIG-B • Proposals • R.3.2.1.1.E bullet 2: replace “2MHz SIGB (long preamble)” with “For MU-MIMO transmission the 2MHz SIGB content is as shown in the following table. For SU-MIMO transmission the SIGB symbol is identical to D-LTF1.” • 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 1st 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 11n HTSIG field 8-bit CRC for the 4-bit CRC in 11ah 2MHz and 1MHz SIG(A) fields, and use the same 11n HTSIG field 8-bit CRC in SIGB field of the >=2MHz long preamble when in MU mode Yongho Seok, LG Electronics

  9. References [1] IEEE 802.11-12/0825r0, Smoothing bit and beam_change indication bit Yongho Seok, LG Electronics

  10. Straw Poll 1 • Do you support the following SIGA fields design for >= 2MHz PHY? Yongho Seok, LG Electronics

  11. Straw Poll 2 • Do you support the following modification of SIGB fields for >= 2MHz PHY? • R.3.2.1.1.E bullet 2: replace “2MHz SIGB (long preamble)” with “For MU-MIMO transmission the 2MHz SIGB content is as shown in the following table. For SU-MIMO transmission the SIGB symbol is identical to D-LTF1.” • 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 1st 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 11n HTSIG field 8-bit CRC for the 4-bit CRC in 11ah 2MHz and 1MHz SIG(A) fields, and use the same 11n HTSIG field 8-bit CRC in SIGB field of the >=2MHz long preamble when in MU mode Yongho Seok, LG Electronics

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