Energy Efficient Mobile Wireless Sensor Network Mac Protocol Research

Wireless sensor networks is a special kind of self-organizing networks that has a wide range of potential applications. Media Access Control (MAC) protocol is a key protocol, which is responsible for the high efficiency of communication in the wireless sensor networks. The performance of the whole networks and the efficiency of the wireless channels utilization mostly lie on the performance of MAC protoco1.In practice, the nodes are always moving, the design of MAC protocols in the past assumed that nodes are at the static. Hence, when a mobile sensor node moves into a new virtual cluster, it needs to adapt to the listen/sleep schedule of the corresponding virtual cluster in a timely and energy efficient manner.This paper researchs mobile wireless sensor networks MAC protocol, and designs an energy-efficient MAC protocol for mobile sensor networks(EM-MAC).which is a improved protocol based on S-MAC.This paper designs and compares the typical MAC protocol, then analysises the mobility-support degree and summarize weakness, which is the foundation to research the mac protocols that apply to mobile wireless sensor networks.The EM-MAC protocol designed in this paper, firstly increases new area in synchronization packets. which can determine the movement program of the node. The paper consists of two main functions: energy efficient secondary listen period and smart scheduling adaptation. and utilizes schedule information on border nodes between virtual clusters. This allows us to implement fast and energy efficient listen/sleep schedule adaptation for mobile nodes.Simulation results show that EM-MAC protocol can provide a better performance than S-MAC in mangy aspects such as the energy efficiency,end-to-end delay and throughput in the mobile wireless sensor networks.