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DL-FDMA considerations

DL-FDMA considerations. Authors:. Date: 2014-09-12. Abstract. This contribution considered Down Link FDMA (DL-FDMA) as a candidate technique for access efficiency improvement for 11ax. Conceptions. AP 20MHzBW * 4CH f requency d ivision m ultiplex transmission (in case of 80MHzBW totally)

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DL-FDMA considerations

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  1. DL-FDMA considerations Authors: • Date:2014-09-12 Katsuo Yunoki, KDDI R&D Labs.

  2. Abstract • This contribution considered Down Link FDMA (DL-FDMA) as a candidate technique for access efficiency improvement for 11ax. Katsuo Yunoki, KDDI R&D Labs.

  3. Conceptions • AP • 20MHzBW * 4CH frequency division multiplex transmission (in case of 80MHzBWtotally) • Up to 4 data streams to 4 STAs are available • 4 concurrent ACKs on different 4 * 20MHz CH • STAs • Data streams on 4 channels will be received and demodulated in parallel • Target data streams are recognized by destination address in MAC header • STA will reply ACK using channels which included the data stream to the STA Katsuo Yunoki, KDDI R&D Labs.

  4. Figure of ConceptionsDL-FDMA: AP  4 STAs DIFS + CW SIFS Ex. CCA Data to STA-1 AP CH36 t STA-1 ACK CCA Data to STA-2 AP t CH40 STA-2 ACK CCA Data to STA-3 AP CH44 t STA-3 ACK CCA Data to STA-4 AP CH48 t STA-4 ACK Katsuo Yunoki, KDDI R&D Labs.

  5. Katsuo Yunoki, KDDI R&D Labs. Sequence by the current standards DIFS +CW DIFS +CW DIFS +CW DIFS +CW SIFS SIFS SIFS SIFS AP Data Data Data Data ACK STA1 ACK STA2 ACK STA3 ACK STA4 Medium time for a set of data deliveries to 4 STAs

  6. Katsuo Yunoki, KDDI R&D Labs. Sequence by this proposal(DL-FDMA) DIFS +CW SIFS Data1 Data2 AP Data3 Data4 STA1 ACK Simultaneous 4 ACKs are responded on different 4 frequency channels. STA2 ACK STA3 ACK ACK STA4 Medium time for a set of data deliveries to 4 STAs

  7. Katsuo Yunoki, KDDI R&D Labs. Medium Time Comparison(Data delivery to 4 STAs) Medium time usage is reduced. Medium Time (us) MPDU size (byte) Refer to Slide-12 for details.

  8. Katsuo Yunoki, KDDI R&D Labs. DL Throughput per a STAwithout considerations on upper layer protocols Throughput (Mbps) MPDU size (byte)

  9. Available Bandwidth Interference 80MHz 40MHz 0MHz 20MHz CH Primary 20M Primary 20M Primary 20M 36 36 36 36 Secondary 20M Secondary 20M 11ac (80M*1) 40 40 40 40 Secondary 40M 44 44 44 44 48 48 48 48 80MHz 60MHz 60MHz 60MHz CH 36 36 36 36 FDMA (20M*4) 40 40 40 40 44 44 44 44 48 48 48 48 FDMA may also have some advantages on available bandwidth in densely deployed environment. Katsuo Yunoki, KDDI R&D Labs.

  10. Mixed Operation with Legacy STAs This FDMA concept may be applicable for mixed operation with legacy STAs. The primary 20MHz channel would be used for a legacy STA on a priority basis and other channels for 11ax supported STAs. It might improve access efficiency of legacy STAs too. CH for a legacy STA 36 Primary 20M FDMA (20M*4) 40 for 11ax STAs 44 48 Katsuo Yunoki, KDDI R&D Labs.

  11. Summary • FDMA may have some advantages in access efficiency on: • Less medium time, • Shorter latency, • Wider available bandwidth in dense environment, • Mixed operation with legacy STAs • Detailed considerations is needed for feasibility study. Katsuo Yunoki, KDDI R&D Labs.

  12. Straw poll • Do you support to study DL-FDMA as a possible technique for efficiency improvement for 11ax? • Y/N/A = Katsuo Yunoki, KDDI R&D Labs.

  13. BackupMedium Time of Frames 40us 8us 8us 4us 8us 4us 4us 4us L-STF L-LTF L-SIG VHT-SIG-A VHT- STF VHT- LTF VHT- SIG-B Data • Data Frame [us] 40 + {(Service + MPDU + PHY pad + Tail) / NDBPS}* 4 = 40 + roundup{(16 + MPDU[byte]*8 + 6) / NDBPS}* 4 MPDU includes MAC header (26 bytes). • ACK Frame [us] 40 + {(Service + MPDU(ACK frame) + PHY pad + Tail) / NDBPS}* 4 = 40 + roundup{(16 + 14*8 + 6) / NDBPS}* 4 NDBPS: the number of data bits per OFDM symbol Katsuo Yunoki, KDDI R&D Labs.

  14. References • [1] Brian Hart et al, IEEE 11-14/855r0, “Techniques for Short Downlink Frames” Katsuo Yunoki, KDDI R&D Labs.

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