Enhancing IEEE802.11 WLAN Performance by Combining Adaptive Contention Window and Random Varying Timing Scheme

A novel contention aware adjusting mechanism is proposed in this letter. Compared with the Binary Exponential Backoff algorithm defined in standard, our scheme can determine the contention window based on the collision status rapidly and the collision probability can be reduced dramatically; moreover, the dynamical varying timing method can make the node adjust the number of packets sending to MAC queue during the busy or idle period. The simulations show that our mechanism is able to optimize the parameters of packets sending out, utilize the radio resource reasonably, and decrease the average packet delay obviously.