Performance Measurement of Different Backoff Algorithms in IEEE 802.15.4

The Low Rate Wireless Personal Area network (LR-WPAN), that is IEEE 802.15.4 is extensively used for many areas of applications. The Slotted CSMA/CA mechanism is used by the standard in its contention access period (CAP) in beacon enabled mode. The protocol supported a binary exponential backoff (BEB) algorithm. In this paper, we investigate the saturation throughput, mean frame service time or delay and energy of this standard using the existing BEB algorithm and compares it with three other backoff schemes-exponential increase exponential decrease (EIED), exponential increase linear decrease (EILD), and exponential increase multiplicative decrease (EIMD) algorithm. From simulation results, it is obtained that EIED, EILD, EIMD performs better than BEB for higher loads that is EIED, EILD, EIMD has better throughput, less delay, using minimal power. The EIED propagates the highest throughput, less delay and minimal energy used among all of these schemes.