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OFDMA performance in 11ax

This study examines the performance of OFDMA in 11ax through PHY/MAC-integrated simulation, focusing on DL only, UL only, and DL/UL mixed scenarios in both single and OBSS (Residential) environments.

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OFDMA performance in 11ax

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  1. OFDMA performance in 11ax Date: 2016-09-12 Authors: Suhwook Kim, LG Electronics

  2. Introduction • In contributions [1] – [9], we have addressed OFDMA performance based on PHY/MAC-integrated simulation • DL only, UL only • DL and UL mixed • Single BSS, OBSS(Residential) • MU-RTS/CTS • Full buffer traffic, low rate traffic • TCP traffic • The goal of this contribution is to verify that the target of 11ax PAR is met • i.e. four times throughput enhancement Suhwook Kim, LG Electronics

  3. Main update in the simulation • RU size in OFDMA • 242-tone RU has been considered in previous simulations • 26-tone RU is considered in this simulation to exploit power gain of OFDMA based on small RU • Simulation scenario • We consider outdoor scenario which is more proper to verify UL OFDMA gain due to large coverage and bad channel condition Suhwook Kim, LG Electronics

  4. Simulation Parameters Suhwook Kim, LG Electronics

  5. Simulation Setup for Single BSS • Topology description • Number of STA: 37 • STA location • 15, 25, 35, 45, 55 meters from AP • Distribution of STA’s location: Next slide • Channel model • UMi, NLoS only 15 m 25 m 35 m 45 m 55 m Suhwook Kim, LG Electronics

  6. Simulation Cases for Single BSS • Case 1: All STAs (37 STAs) are co-located • Case 1 – 1 : All STAs at 55 meters • Case 1 – 2 : All STAs at 45 meters • Case 1 – 3 : All STAs at 35 meters • Case 1 – 4 : All STAs at 25 meters • Case 1 – 5 : All STAs at 15 meters • Case 2: 37 STAs are equally distributed at most • 7 / 7 / 7 / 8 / 8 (55m / 45m / 35m / 25m / 15m) Suhwook Kim, LG Electronics

  7. Simulation Setting: Best MCS and BW • In each distance, the best combination of MCS and transmission BW was selected for legacy system through the simulation   • In OFDMA, best MCS was selected at each distance with fixed BW of 80MHz Suhwook Kim, LG Electronics

  8. Simulation Result for Single BSS: Case 1 • All STAs (37 STAs) are co-located • Note • OFDMA gain increases with distance between STA and AP • For distances larger than 15 meters, OFDMA gain is larger than four times Suhwook Kim, LG Electronics

  9. Simulation Result for Single BSS: Case 2 • 37 STAs are equally distributed at most • Note • The gain of OFDMA is still large, but smaller than in case 1 • It is because near STAs get more TXOP and dominantly affect the overall performance Suhwook Kim, LG Electronics

  10. Simulation Setup for OBSS • Topology description • Number of STA per BSS: 37 • Distance between AP: 130 meters (same distance with SS4 Outdoor Large BSS) • STA location: 15, 25, 35, 45, 55 meters from each home AP • Channel model: UMi, NLoS only • MCS and BW setting: Same as the single BSS case (as shown in slide 7) 55 m 55 m 130 m Suhwook Kim, LG Electronics

  11. Simulation Cases for OBSS • Case 3: All STAs (37 STAs per BSS) are co-located per BSS • Case 3 – 1 : All STAs at 55 meters from each home AP • Case 3 – 2 : All STAs at 45 meters from each home AP • Case 3 – 3 : All STAs at 35 meters from each home AP • Case 3 – 4 : All STAs at 25 meters from each home AP • Case 3 – 5 : All STAs at 15 meters from each home AP • Case 4: All STAs (37 STAs per BSS) are equally distributed at most • Each BSS uses the setting of Case 2 in Single BSS • 7 / 7 / 7 / 8 / 8 (55m / 45m / 35m / 25m / 15m) Suhwook Kim, LG Electronics

  12. Simulation Result for OBSS: Case 3 • Note • OBSS shows the similar trend as single BSS case • OFDMA gain increases with distance between STA and AP • For distances larger than 15 meters, OFDMA gain is larger than four times in single BSS and OBSS Suhwook Kim, LG Electronics

  13. Simulation Result for OBSS: Case 4 • Note • OBSS shows the similar trend as single BSS case • Regarding far STAs (e.g. STAs @ 55m), gains of OFDMA is quite large (larger than 20 times) • Regarding near STAs (e.g. STAs @ 15m), gains of OFDMA decreases (around 50%) Suhwook Kim, LG Electronics

  14. Conclusion • We verified that OFDMA can provide four times throughput enhancement in outdoor environment • Far STAs provide gains of more than four times due to power gain in UL by using a smaller RU (e.g. 26-tone RU) • But, near STAs provide smaller gains than four times • More gain in OFDMA can be obtained e.g., by adopting a better scheduler than a random scheduler Suhwook Kim, LG Electronics

  15. Reference • [1] ~ [9] 11-15/1095r0 ~ r9 • [10] 11-14/0980r14 Simulation Scenarios Suhwook Kim, LG Electronics

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