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Fairness of DCF in 802.11ah

Fairness of DCF in 802.11ah. Authors:. Date: 2011-11-07. Abstract. Study the fairness of DCF for 802.11ah depending on the traffic load with different DCF parameters. Simulation Scenarios. Num of AP: 1 Num of Stations: 1000 Topology:. Simulation Parameters. Simulation Parameters 2.

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Fairness of DCF in 802.11ah

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  1. Fairness of DCF in 802.11ah Authors: • Date:2011-11-07 Chittabrata Ghosh, Nokia

  2. Abstract • Study the fairness of DCF for 802.11ah depending on the traffic load with different DCF parameters Chittabrata Ghosh, Nokia

  3. Simulation Scenarios • Num of AP: 1 • Num of Stations: 1000 • Topology: Chittabrata Ghosh, Nokia

  4. Simulation Parameters Chittabrata Ghosh, Nokia

  5. Simulation Parameters 2 • Pathloss model • Outdoor Macro [2]: PL(d) =8+37.6log10(d) • Station to Station model [3]: PL(d)=16.90 + 42.4*log10(d) • Traffic Model • Simulation Time = 160 Seconds • TX time for each packet is randomly selected in the 160 seconds 160 seconds Zhong-Yi Jin, Nokia

  6. Fairness: throughput CDF (CWmin 15) RTS/CTS Without RTS/CTS Chittabrata Ghosh, Nokia

  7. Fairness: STA with throughput zero (CWmin 15) Chittabrata Ghosh, Nokia

  8. Effect of increasing load on througput with link adaptation (CWmin 15) Chittabrata Ghosh, Nokia

  9. STA with zero throughput for varying CW With RTS/CTS Without RTS/CTS Chittabrata Ghosh, Nokia

  10. Conclusions • DCF is unfair and inefficient in terms of energy and throughput under heavy/bursty traffics • Varying CW sizes does not solve the problem Chittabrata Ghosh, Nokia

  11. References • [1] 11-11-1229-r0 TGah 11ah M2M channel access performance • [2] TGah channel model – proposed text, IEEE802.11-11/0968r1 • [3] STA-STA Pathloss Model, IEEE802.11-11/1263r4 Chittabrata Ghosh, Nokia

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