Implementation of the Adaptive CSMA-CA Algorithm Based on Traffic Load

IEEE802.15.4 is a standard designed for low rate wireless personal area network. For its MAC protocol adopts the competition method to share wireless channel, collisions between ending devices are unavoidable and lead to retransmissions, consuming more energy. As traffic load becomes heavier, collisions and retransmissions are more serious. The focus of this paper is to achieve dynamic-parameter CSMA-CA algorithm based traffic load in IEEE 802.15.4 and measure the performance of modified IEEE802.15.4 in some aspects (packet delivery rate, collision rate, collision rate and average MAC delay). Different from previous papers, it analyzes the performance of the algorithm in direct data transmission and respectively executes simulations both including and excluding hidden-terminal (HT) problems.