AIAD: Enhanced Backoff Scheme for the IEEE 802.11 DCF
首发时间:2007-08-21
Abstract:A new backoff algorithm is proposed to enhance the performance of the IEEE 802.11 Distributed Coordination Function (DCF) which used to employ Binary Exponential Backoff (BEB) algorithm. The drastic change of Contention Window (CW) of BEB results in poor performances of fairness and delay jitter. To solve these problems, a novel algorithm called Adaptive Increment Adaptive Decrement (AIAD) is proposed, which adjusts the CW based on historical collision number. In AIAD, the adjustment of CW can properly reflect the state of medium contention, which results in improvements of fairness and delay jitter. Another backoff algorithm called Multiple Increase Linear Decrease (MILD) is considered for performance comparison. The simulation results show that AIAD outperforms BEB and MILD in general performance.
keywords: BEB, MILD, AIAD, fairness, delay jitter
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AIAD:IEEE 802.11 DCF中一种改进的退避机制
摘要:IEEE 802.11 DCF的基本退避算法BEB以它的简单高效而得到广泛认可,但随着网络负载的增加,由于竞争窗口变化过于剧烈,造成了严重的不公平性和延时抖动问题.为了解决这两个问题,本文在分析了几种退避算法的优缺点后,提出一种新的慢速退避算法——AIAD.AIAD通过历史冲突次数来决定竞争窗口的变化幅度,使得竞争窗口能正确反映信道竞争情况,从而达到公平性和延时抖动性能上的改进.对BEB、MILD和AIAD进行仿真的结果证明了AIAD算法的优越性.
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No.1462913547111876****
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