Optimal Capacity Utilization in Mobile Ad hoc Network with Adaptive Contention Window Management Scheme

Abstract Efficient channel utilization is the utmost challenge in mobile ad hoc network (MANET). Moreover, Medium Access Control (MAC) layer in MANETs experiences hidden and exposed terminal issues. During data transmission, there occurs increased energy consumption, overhead and many retransmissions because of the collision of Request To Send (RTS) packet. In order to solve this problem, we propose an algorithm named Fore-handed Collision Avoidance MAC (FCA-MAC). This protocol mainly focuses on the collisions detected at the destination. In FCA-MAC, the failed RTS packet detection is considered with Appeal for Request To Send (ARTS) packet. To reduce the delay, RTS collision and redundant re-transfer, we consider the minimum number of ARTS packets. To regulate the Contention Window (CW), an additional field factor named triumph factor is introduced in FCA-MAC which reflects the complete network state at the destination. Implementation of FCA-MAC is done using Network Simulator (NS2). Results reveal that the proposed FCA-MAC outperforms standard techniques with regard to various performance metrics.