Restructing 802.15.4 MAC protocol´s Superframe structure for energy and transmission efficiency

Recently Internet of Things(IoT) technology, especially the technologies used for Wireless Sensor Network (WSN) have attracted great amount of attention. Since ZigBee, which is a low-power and low cost technology, is appeared, related applications are proliferation. The studies of how energy efficiency can be further achieved are steadily on progress. In this paper, we propose a method which increases the energy efficiency by reducing unnecessary Clear Channel Assessment(CCA) and by increasing the sleep duration of End-Device through changing the structure of a ZigBee Superframe using the IEEE 802.15.4 Medium Access Control(MAC). Simulation results show that our method increases energy efficiency.