A Logarithmic Backoff Algorithm Based on Dynamic Contention Window Adjustment for IEEE 802.11 DCF
IEEE 802.11 is a protocol standard widely used in Wireless Local Area Network (WLAN). For the Distributed Coordination Function (DCF) of IEEE 802.11 MAC layer, the Binary Exponential Backoff (BEB) algorithm has the defect of poor access fairness. To address this issue, the design criteria of backoff algorithm is generalized from the analysis of the key performance parameters of DCF, and then a Logarithmic Backoff (LB) algorithm based on dynamic Contention Window (CW) adjustment is proposed. The algorithm dynamically adjusts the initial value of CW and the backoff size of the CW by using the logarithmic function that takes the number of network competing nodes as the variable.