Scheduling Method for Improving Transmission and Reception Efficiency in IEEE802.15.4 used Heterogeneous Wireless Sensor Networks

In recent years, WSNs have been expected to be applied to various fields such as home security, healthcare, and environmental monitoring. A number of studies have been done on IEEE 802.15.4, the standard for WSNs, but they have left some problems and there is still room for improvement. In this paper, we propose a new access control protocol in tree-type heterogeneous sensor networks that achieves low EC, high PDR, and low latency by adjusting the active period so that the buffer occupancy ratio of the relay node is less than 1 to prevent the buffer from overflowing, and then performing channel partitioning and scheduling to avoid packet collisions.