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| 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. |
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| Keywords:BEB, MILD, AIAD, fairness, delay jitter |
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