IEEE 11-14/1382r0 Responses to Comments and Proposals on DL-FDMA Considerations
This document from October 2014 addresses feedback and proposals related to DL-FDMA considerations for simultaneous data transmissions using multi-channels, focusing on access efficiency and interference mitigation in wireless communications. The content discusses the distinction between FDM and FDMA, varying frame lengths for receivers, legacy device considerations, and more.
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October 2014 doc.: IEEE 11-14/1382r0 Responses to the comments on doc.1169r0 Date: 2014-10-30 Authors: Name Katsuo Yunoki Affiliations Address KDDI R&D Laboratories Phone email yunoki@kddilabs.jp 3-10-10, Iidabashi, Chiyoda-ku, Tokyo 102-8460 JAPAN Bingxuan Zhao KDDI R&D Laboratories Submission Slide 1 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 Abstract This contribution is a follow-up of IEEE 11-14/1169r0, DL-FDMA considerations which was presented at September 2014 meeting. Submission Slide 2 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 Recap: DL-FDMA Simultaneous data transmissions to multiple STAs using multi-channels. It may improve access efficiency. DIFS + CW SIFS Ex. CCA Data to STA-1 AP STA-1 CH36 t ACK CCA Data to STA-2 AP STA-2 t CH40 ACK CCA Data to STA-3 AP STA-3 CH44 t ACK CCA Data to STA-4 AP STA-4 CH48 t ACK Submission Slide 3 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 Comments at September meeting C1: This proposal is Frequency Division Multiplexing (FDM), it s not FDMA. C2: Frame lengths are different for each receiver regarding data size to be sent and data rate. C3: It is necessary to consider interference mitigation measure for a legacy device at the mixed simultaneous transmission with 11ac devices. C4: Definition of legacy is needed. Submission Slide 4 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 C1: This proposal is Frequency Division Multiplex. A1: I m not sure if this access method can be called FDMA. However, each channel isn t dedicated to just a certain STA. Colors don t have any meanings. Just identifying different destinations. DIFS+CW Ex. to STA5 to STA1 to STA9 CH36 t ACK ACK ACK to STA6 to STA10 to STA2 t CH40 ACK ACK ACK to STA7 to STA3 to STA11 CH44 t ACK ACK ACK to to STA4 to STA8 CH48 STA12 t ACK ACK ACK Submission Slide 5 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 C2: Frame lengths are different for each receiver. A2: Yes. It s true. Similar size packets can easily be sent simultaneously. They will be small size packets. Time length difference among these packets will be adjusted by padding. DIFS+CW SIFS Ex. to STA1 pad t ACK to STA2 t ACK to STA3 pad t ACK to STA4 pad t ACK Submission Slide 6 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 C3: Interference mitigation is needed for legacy device. A3: Guard band can be set as a solution when simultaneous transmissions are needed for a legacy device. When the legacy uses 40MHzBW, When the legacy uses 20MHzBW, DIFS+CW SIFS DIFS+CW SIFS to STA1 (11a) Primary 20MHz Primary 20MHz t t ACK ACK to STA1 (11n) Guard band (not used) Secondary 20MHz Secondary 20MHz t t Guard band (not used) to STA2 (11ax) t t ACK to STA3 (11ax) to STA2 (11ax) t t ACK ACK Submission Slide 7 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 C4: Definition of legacy device is needed. A4: Legacy means the existing standards as follows: 2.4GHz 11b/g/n 5GHz 11a/g/n/ac Submission Slide 8 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 Summary This contribution responded to some comments received at September meeting. Comparing with OFDMA, the proposed access method may not have much better efficiency. However it doesn t require any negotiation processes before data frame transmissions. It will have advantages to deliver short packets to multiple destinations. Submission Slide 9 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 Straw poll Do you support to study this access method proposed in doc. 14/1169r0 and this contribution as a possible technique for efficiency improvement for 11ax? Y/N/A Submission Slide 10 K. Yunoki and B. Zhao, KDDI R&D Labs.
October 2014 doc.: IEEE 11-14/1382r0 References [1] IEEE 11-14/855r0, Techniques for Short Downlink Frames [2] IEEE 11-14/1169r0, DL-FDMA considerations Submission Slide 11 K. Yunoki and B. Zhao, KDDI R&D Labs.
