An enhanced CSMA-CA mechanism for multihop ad hoc networks
Zhongbang Yao, Pingyi Fan, Zhigang Cao · 2005
We propose a two-dimensional (2D) Markov model, which considers packet losses, for carrier sense multiple access with collision avoidance (CSMA-CA) mechanism. Since the initial contention window (ICW) has great impact on the performance of CSMA-CA, we introduce an adjustable state parameter q(0<q<1) to extend ICW. In addition, we analyze the number of competing stations for any source station in a multihop ad hoc network. Based on the analysis result, we develop an adjusting procedure for CSMA-CA mechanism in multihop ad hoc networks. The simulation results show that the packet loss ratio can be reduced through dynamically adjusting ICW by changing q.