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OFDMA performance in 11ax

OFDMA performance in 11ax. Date: 2016-03-14. Authors:. Introduction. In January, w e addressed OFDMA performance when we use simple MU-RTS/CTS and CCA after trigger frame RTS/CTS is more powerful in many STAs case and legacy cases Nevertheless, OFDMA shows better throughput

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OFDMA performance in 11ax

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  1. OFDMA performance in 11ax Date: 2016-03-14 Authors: Suhwook Kim, LG Electronics

  2. Introduction • InJanuary, we addressed OFDMA performance when we use simple MU-RTS/CTS and CCA after trigger frame • RTS/CTS is more powerful in many STAs case and legacy cases • Nevertheless, OFDMA shows better throughput • This presentation provides update on it Suhwook Kim, LG Electronics

  3. Simulation update • MU-RTS/CTS • We evaluate MU-RTS/CTS scheme which are defined in our SFD • Preamble detection of STA side • A STA can detect multiple preambles on different channel • BSS channelization • Channelization of each BSS can be different Suhwook Kim, LG Electronics

  4. Simulation Setup: Scheduler • Scheduling resource • Maximum allocation per one station is 1 RU • 1 RU: 242-tone (total 4 RUs in 80 MHz) • Scheduling policy • Random: AP selects STAs randomly • In DL case, • primary destination is fixed (Head of AP’s queue) • frame length is determined by A-MPDU length to primary destination (legacy spec rule) Suhwook Kim, LG Electronics

  5. MU-RTS/CTS in DL-OFDMA • Weevaluate two MU-RTS/CTS schemes • Simple MU-RTS/CTS • STAs can transmit CTS frame on secondary channel only • SFD MU-RTS/CTS [1] • Primary channel should be included when STAs transmit CTS frame Suhwook Kim, LG Electronics

  6. MU-RTS/CTS in DL-OFDMA • Simple MU-RTS/CTS Suhwook Kim, LG Electronics

  7. MU-RTS/CTS in DL-OFDMA • SFD MU-RTS/CTS Suhwook Kim, LG Electronics

  8. Simulation Setup: Parameters Suhwook Kim, LG Electronics

  9. Topology • Topology description • 20 APs (Fixed location: center of room) • 4 or 20 STAs per one AP (Random location) • Simulation setting • Open Loop Link Adaption [3] • Channelization: Fixed channel • Trigger frame is generated every 10 msec period and trigger frame has priority over data frame CH1 CH2 CH3 Suhwook Kim, LG Electronics

  10. Simulation cases • Case 1: BSS channelization is fixed (all channelization 1) • Case 1-1: 4 STAs, DL/UL 50 Mbps • Case 1-2: 20 STAs, DL/UL 4 Mbps • Case 2: BSS channelization is random (1 or 2) • 2-1: 4 STAs, DL/UL 50 Mbps • 2-2: 20 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics

  11. Simulation Result – Case 1 • Case 1-1: 4 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics

  12. Simulation Result – Case 1 • Case 1-2: 20 STAs, DL/UL 4 Mbps Suhwook Kim, LG Electronics

  13. Simulation Result – Case 1 • Throughput comparison • PER Suhwook Kim, LG Electronics

  14. Simulation Result – Case 2 • 2-1: 4 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics

  15. Simulation Result – Case 2 • 2-2: 20 STAs, DL/UL 50 Mbps Suhwook Kim, LG Electronics

  16. Simulation Result – Case 2 • Throughput comparison • PER Suhwook Kim, LG Electronics

  17. Discussion • RTS/CTS could not show better throughput in OFDMA • PER of OFDMA is around 5 ~ 15 % even through RTS/CTS is not used. The reasons are • Reduced contending • Frequency diversity • So, a room for throughput enhancement by RTS/CTS is limited • Because of the situation, RTS/CTS-Simple and RTS/CTS-SFD couldn’t have different performance • We will evaluate RTS/CTS performance in following environments to verify our discussion • OFDMA with uplink EDCA contending • Dense AP Suhwook Kim, LG Electronics

  18. Next Step • Following items will be added to OFDMA simulation • RTS/CTS • OFDMA with uplink EDCA contending • Dense AP • Feedback modeling • Sophisticated schedulers • Different scenarios/traffic model Suhwook Kim, LG Electronics

  19. Conclusion • We addressed OFDMA performance when we use MU-RTS/CTS which are defined in SFD • We evaluated three cases • NO RTS/CTS • RTS/CTS-Simple • RTS/CTS-SFD • However, No RTS/CTS, RTS/CTS-Simple, and RTS/CTS-SFD show very similar performance Suhwook Kim, LG Electronics

  20. Reference • [1] 11-15/0132r15 Spec Framework • [2] 11-14/0980r14 Simulation Scenarios • [3] 11-14/620r0 link adaptation for PHY SLS calibration • [4] 11-14/0571r10 11ax Evaluation Methodology Suhwook Kim, LG Electronics

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