Ch4_Multiaccess_Communication-2008-2-rev

Ch4_Multiaccess_Comm - Multiaccess Communication Sunghyun Choi Adopted from Prof Saewoong Bahk’s material Stabilized Slotted ALOHA • Maintain

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Unformatted text preview: Multiaccess Communication Sunghyun Choi Adopted from Prof. Saewoong Bahk’s material Stabilized Slotted ALOHA • Maintain the attempt rate G (n) at 1. – when an idle slot occurs, increase q r – when a collision occurs, decrease q r – Success, idle, collision probabilities = 1/ e, 1/ e , 1- 2/ e • Pseudo-Bayesian algorithm – new arrivals are regarded as backlogged immediately on arrival – ( n backlogged packets including new arrivals) r nq n G = ) ( – prob. of a successful transmission – maintain an estimate of the backlog at the beginning of each slot. – – 1 1 1 ) 1 ( ) 1 (--- =- n r r n r r n q nq q q C n ˆ 1 ˆ ( ) m in 1, ˆ r q n n = success or idle for ] 1 ˆ , max[ ˆ 1- + = + λ λ k k n n 1 ˆ ( 2) for collision k n e λ- + +- – updated at the beginning of slot ( k+ 1) – for idle, decrease by 1 to improve performance n ˆ • Stability of pseudo-Bayesian algorithm – It is stable for all • Drift of n and ˆ n n- 1/ e λ < • Approximate delay analysis...
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This note was uploaded on 06/16/2008 for the course COMPUTER S 853 taught by Professor Choi during the Spring '08 term at Seoul National.

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Ch4_Multiaccess_Comm - Multiaccess Communication Sunghyun Choi Adopted from Prof Saewoong Bahk’s material Stabilized Slotted ALOHA • Maintain

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