Study on Backoff Algorithm for IEEE 802.15.4 LR-WPAN

IEEE 802.15.4 standard is to implement sensor networks with low power consumption and low cost. The transmission period of IEEE 802.15.4 consists of contention access period (CAP) and contention free period (CFP). CAP applies carrier sense multiple access with collision avoidance (CSMA/CA) for its contention mechanism. In such a network, channel utilization is significantly affected by backoff time and packet collision. This paper proposes a delayed backoff algorithm (DBA) to improve the effective goodput and power consumption, which are obtained by simulation experiments and compared with different schemes. The proposed algorithm performs better than the other schemes according to the obtained results.