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Performance Evaluation of an Adaptive Collision Avoidance Algorithm for IEEE 802.15.4
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 Title & Authors
Performance Evaluation of an Adaptive Collision Avoidance Algorithm for IEEE 802.15.4
Noh, Ki-Chul; Lee, Seung-Yeon; Shin, Youn-Soon; Ahn, Jong-Suk; Lee, Kang-Woo;
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Like other wireless network protocols, IEEE 802.15.4 adopts CA (Collision Avoidance)algorithm to avoid the early collision of a new packet by randomizing its first transmission time rather than its immediate delivery. The traditional CA scheme of IEEE 802.15.4, however, selects the random access time from the predetermined range without considering the degree of current congestion. It probably causes either a long delay to settle in the suitable range for the current network load or frequent clashes especially during the long lasting heavy traffic period. This paper proposes an ACA(Adaptive Collision Avoidance) algorithm adapting the initial backoff range to the undergoing collision variations. It also introduces a mathematical model to predict the performance of ACA algorithm added to IEEE 802.15.4. With only small deviations from corresponding simulations, our analytical model shows that ACA technique can improve the throughput of IEEE 802.15.4 by up-to 41% maximally in addition to shortening the packet delays.
CA Algorithm;Adaptive CA Algorithm;BEB Algorithm;Marchov Chain Performance Mode;
 Cited by
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