R.3.2.1.2.D: The 802.11ah draft specification shall have 1MHz SIG field contents as follows. SIG Field Bits Comments STBC 1 Same as in 11ac Num 2 Number of streams for SU SGI 1 Short Guard Interval Coding 2 1st bit is coding type (LDPC/BCC), 2nd bit is for LDPC Nsym ambiguity MCS 4 MCS Signals use of AMPDU Aggregation 1 bit Length field (in symbols when aggregation is ON, is in bytes when Length 9 aggregation is OFF, Mandate AMPDU for packet sizes > 511 bytes Ack Indication 2 00: Ack; 01: BA; 10: No Ack; 11: a frame not ACK, BA or CTS [refer to R.3.2.1.B] Reserved Some possible uses are MAC bits or any other new features etc. Details TBD CRC 4 4 bits of CRC should be enough Tail 6 36 SIG goes at BPSK-rate ½ -rep 2 No MU transmissions for the 1MHz mode No AID supported R.3.2.1.2.I: The following CSD (to be applied Per-Space-Time-Stream) shall be used for the 1 MHz frame format [2012 July meeting minutes, 11-12/83r1:motion1, 4]: T_cs(n) for 1MHz Frame Format Total Cyclic shift (for Tx Stream n) (μs) number of time streams 1 2 3 4 1 0 - - -
R.3.2.1.2.D: The 802.11ah draft specification shall have 1MHz SIG field contents as follows. SIG Field Bits Comments STBC 1 Same as in 11ac Num 2 Number of streams for SU SGI 1 Short Guard Interval Coding 2 1st bit is coding type (LDPC/BCC), 2nd bit is for LDPC Nsym ambiguity MCS 4 MCS Aggregation bit 1 Signals use of AMPDU Length 9 Length field (in symbols when aggregation is ON, is in bytes when aggregation is OFF, Mandate AMPDU for packet sizes > 511 bytes Ack Indication 2 00: Ack; 01: BA; 10: No Ack; 11: a frame not ACK, BA or CTS [refer to R.3.2.1.B] Reserved Some possible uses are MAC bits or any other new features etc. Details TBD CRC 4 4 bits of CRC should be enough Tail 6 36 SIG goes at BPSK-rate ½ -rep 2 No MU transmissions for the 1MHz mode No AID supported R.3.2.1.2.I: The following CSD (to be applied Per-Space-Time-Stream) shall be used for the 1 MHz frame format [2012 July meeting minutes, 11-12/83r1:motion1, 4]: T_cs(n) for 1MHz Frame Format Total number of streams Cyclic shift (for Tx Stream n) (μs) 1 2 3 4 1 0 - - - time
11-12-1158-00-00ah-tgah-sfd-d10-x.docx