1 / 21

OFDMA performance in 11ax

This presentation provides an update on the evaluation of OFDMA performance in 11ax using a PHY/MAC integrated simulator. Topics covered include MU-RTS/CTS, CCA in UL-OFDMA, and simulation setup parameters.

iclemens
Download Presentation

OFDMA performance in 11ax

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. OFDMA performance in 11ax Date: 2016-01-17 Authors: Suhwook Kim, LG Electronics

  2. Introduction • From September meeting, we have addressed OFDMA performance using PHY/MAC integrated simulator • OFDMA shows better performance in throughput and latency in DL & UL mixed traffic • This presentation provides update on it Suhwook Kim, LG Electronics

  3. Update on Simulation • MU-RTS/CTS • We evaluate MU-RTS/CTS on OFDMA • CCA in UL-OFDMA • STAs perform CCA after Trigger frame reception 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. CCA in UL-OFDMA • CCA in UL-OFDMA • STAs perform CCA after Trigger frame reception Suhwook Kim, LG Electronics

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

  7. MU-RTS/CTS in DL-OFDMA • Detail operation • We evaluate simple MU-RTS/CTS scheme because of simulator issue • Resource for RTS/CTS is aligned with Data/ACK transmission • Only one resource unit can be allocated for RTS/CTS/DATA/ACK • Preamble detection thresholds are -82 dBm for primary channel and -72 dBm for secondary channels • STAs perform CCA after RTS frame reception • If a channel which is allocated for data is sensed as busy, the STA will not transmit CTS frame 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 10 or 20 STAs per one AP (Random location) • Primary/secondary channels of every AP are same • Simulation setting • Open Loop Link Adaption [3] • Channelization: Fixed channelization • 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: Throughput vs. # of STAs (DL/UL 4 Mbps) • 4 STAs • 10 STAs • 20 STAs • Case 2: Throughput vs. Traffic load (4 STAs) • DL/UL 4 Mbps • DL/UL 50 Mbps Suhwook Kim, LG Electronics

  11. Simulation Result – Case 1 • OFDMA Suhwook Kim, LG Electronics

  12. Simulation Result – Case 1 • Legacy Suhwook Kim, LG Electronics

  13. Simulation Result – Case 1 • Legacy vs. OFDMA • Observation • RTS/CTS is more powerful in many STAs case • Throughput gain of RTS/CTS is more larger in legacy case • Nevertheless, OFDMA shows better throughput in dense cases Suhwook Kim, LG Electronics

  14. Simulation Result – Case 2 • OFDMA Suhwook Kim, LG Electronics

  15. Simulation Result – Case 2 • Legacy Suhwook Kim, LG Electronics

  16. Simulation Result – Case 2 • Legacy vs. OFDMA • Observation • Throughput gain of RTS/CTS is more larger in legacy case • In 4-STA-OFDMA case, throughput gain of RTS/CTS is limited even though traffic level increases • Nevertheless, OFDMA shows better throughput in most cases Suhwook Kim, LG Electronics

  17. Next Step • Following items will be added to OFDMA simulation • Advanced MU-RTS/CTS • Feedback modeling • Sophisticated schedulers • Different scenarios/traffic model Suhwook Kim, LG Electronics

  18. Conclusion • 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 Suhwook Kim, LG Electronics

  19. Reference • [1] 11-15/0132r7 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

  20. Backup Slide- PER Suhwook Kim, LG Electronics

  21. Simulation Result • Legacy vs. OFDMA Suhwook Kim, LG Electronics

More Related