An Improved Backoff Algorithm of Ad Hoc Networks

By analyzing Binary Exponential Backoff(BEB) algorithm used in IEEE 802.11 standard , an adaptive improved algorithm is proposed to improve the fairness of the channel access for BEB algorithms, It adjusts dynamically the way of increase or decrease of the contention window based on the number of frame which is sent successfully. Using NS2 to analyze the network´s fairness of the channel access of the improved algorithms, the simulation results show that, compared with BEB algorithm, improved algorithm can improve the fairness of the channel access and increase the network´s throughput capacity at the same time.