Enhancing Wi-Fi Spectrum Efficiency with Non-Orthogonal Multiple Channel Access
Explore the concept of Non-Orthogonal Multiple Access (NOMA) in Wi-Fi networks for improved spectrum efficiency. This presentation delves into theoretical and experimental results, considering the use of NOMA as a solution for serving multiple devices with varying distances and traffic loads from access points.
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Nov 2018 doc.: IEEE 802.11-18/1957r1 Non-orthogonal Multiple Channel Access in Wi-Fi Date: 2018-11-11 Authors: Name Affiliation Address Phone Email Evgeny Khorov IITP RAS khorov@iitp.ru Alexey Kureev IITP RAS Ilya Levitsky IITP RAS Submission Slide 1 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Motivation In current networks, it is a typical situation when an access point serves several devises located at different distances from the AP and having different traffic load. In this case, Non-orthogonal multiple access (NOMA) can be a promising solution to increase spectrum efficiency. This presentation considers theoretical and experimental results for DOWNLINK NOMA. [1] proposes SOMA, which is actually a specific case of NOMA (having no SIC). [1] doc.: IEEE 802.11-18/1462r0 SOMA for EHT Submission Slide 2 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Basic Idea of Downlink NOMA Power TDMA Different MCSs NOMA Power P P To STA2 To STA2 ? ? To STA1 To STA1 STA 2 AP STA 1 ????2= ? log 1 +(1 ?) ? ??? ????2 ?????2 STA2 decodes signal to STA1 and performs Successive Interference Cancelation (SIC) ? ? ??? ????1 ?????1+ (? ?) ? ????????? ????1= ? log 1 + Submission Slide 3 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Signal Superposition TX side RX side STA1 Q I STA2 Submission Slide 4 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 A possible transmission process SIFS SIFS DIFS To STA2 To STA1 AP STA1 ACK STA2 ACK Submission Slide 5 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 THEORETICAL RESULTS Submission Slide 6 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Theoretical Results 802.11a 3 dB 19 dB 0 and 6 0 and 4 0.85 PHY SNR1 SNR2 MCS TDMA MCS NOMA ? Submission Slide 7 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 More fair comparison 802.11a 3 dB 19 dB 0 and 6 0 and 4 0.85 PHY SNR1 SNR2 MCS TDMA MCS NOMA ? Submission Slide 8 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Balance between throughput for STA1 & STA2 ???? (????) ???? ???? ???? ?=0.85 Mix of NOMA (STA1 and STA2) and CSMA (STA2) Submission Slide 9 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 EXPERIMENTAL RESULTS Submission Slide 10 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Testbed AP (SDR) STA2 (SDR) As NOMA device Can be used with legacy off-the-shelf device! STA1 (Laptop) legacy device Submission Slide 11 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Testbed. Experimental Setup AP (SDR) STA2 (SDR) As NOMA device Replaced, to simplify gathering statistics STA1 (SDR) As legacy device Submission Slide 12 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Evaluation. Reference Throughputs STA1 Payload ~ 1kB STA2 Payload ~ 2kB Submission Slide 13 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Testbed. Results NOMA Link1 MCS1 Link2 MCS4 +56% STA1 Payload ~ 1kB STA2 Payload ~ 2kB Submission Slide 14 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Balance between throughput for STA1 & STA2 ???? (????) ???? ???? ???? ?=0.86 Mix of NOMA (STA1 and STA2) and CSMA (STA2) Submission Slide 15 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 NOMA Properties Backward compatibility (STA 1 can be legacy) Almost double throughput for the STA with poor channel (in case of fare resource allocation) OR Manifold gain in throughput of the nearest STA (STA 2) while providing guaranteed throughput for the furthest STA (STA 1) The results should be also valid for SOMA Submission Slide 16 Evgeny Khorov (IITP RAS)
Nov 2018 doc.: IEEE 802.11-18/1957r1 Straw Poll Should NOMA/SOMA be considered as a possible direction for future 802.11 standards? Yes, for EHT Yes, for a separate project No Need more info Abstain Submission Slide 17 Evgeny Khorov (IITP RAS)
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