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Channel Model Proposal for 802.11e MAC Simulations

Channel Model Proposal for 802.11e MAC Simulations. Sunghyun Choi Philips Research Briarcliff Manor, New York. Introduction. Don’t like to include the complicated PHY behavior for MAC simulations Still need to incorporate the PHY behavior for MAC evaluation

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Channel Model Proposal for 802.11e MAC Simulations

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  1. Channel Model Proposal for 802.11e MAC Simulations Sunghyun Choi Philips Research Briarcliff Manor, New York Sunghyun Choi, Philips Research

  2. Introduction • Don’t like to include the complicated PHY behavior for MAC simulations • Still need to incorporate the PHY behavior for MAC evaluation • Error-free PHY assumption is too much • Random error assumption does not reflect the reality • Two-state Markov channel model? • Well accepted model for link layer evaluations • Reflects the bursty error behavior of the wireless channel Sunghyun Choi, Philips Research

  3. Two-State Markov Model • Two bit error probabilities: • Pe,G (in good state)and Pe,B (in bad state) • Four transition probabilities (or rates in sec-1) • PG,B, PG,G (= 1-PG,B), PB,G , PB,B (= 1-PB,G ) • Stays in each state for an exponentially-distributed time Sunghyun Choi, Philips Research

  4. Two Extreme Cases • Bursty error model • Pe,G = 0 and Pe,B = 1 • Pkt 1 received in error / Pkt 2 received correctly • Random error model • Start in Bad state and PB,G = 0 Sunghyun Choi, Philips Research

  5. Other Concerns • A channel behavior determined for each transmitter-receiver pair due to location-dependent channel behavior • E.g., at time t, channel (STA A, STA B) in bad state while channel (STA B, STA C) in good state • Can assume that channels (STA A, STA B) and (STA B, STA C) are independent for simulations • Realistic values of the probabilities? • May want to ask the folks working in PHY in 802.11 WG Sunghyun Choi, Philips Research

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