Study On Supporting Node Mobility Technology For Wireless Sensor Network

Wireless sensor network is a new platform for information access, which has unparalleled advantages over other networks of capturing information. And it can monitor and collect real-time information of various monitoring objects within the network distribution area,so as to detect and track complex target for specified range.Therefore,it can greatly compensate the deficiency of information collection in wireless network. In addition,due to the characteristics of rapid deployment and strong survivability and so on, wireless sensor network has a wide application prospect. But with the introduction of more and more mobility nodes into wireless network, and the optimization of overall network performance,researchers gradually focus on deeper study on issues for supporting nodes mobility in wireless sensor network.This paper detailly describes the concepts, characteristics, development tendency and research direction of key technology of supporting node mobility in wireless sensor network. Based on the analysis of LEACH protocol in detail,the network is optimized in preset parameters, the cluster head election algorithm and network topology and so on,and so that it(which) can reduce energy consumption, increase network throughput and prolong network lifetime. This paper focuses on discussing the existing MAC protocol of wireless sensor network and impact of the nodes with mobility on these protocols ,and futher proposes a dynamic polling MAC protocol with high throughput of supporting node mobility in wireless sensor network.To obtain better results in mobility management of wireless sensor networks, this paper also puts forward a rapid switching method based on RSSI and LQI,which make improvements on preset parameters, subnet selection, decision standards and reparation of switching failure. Furthermore,the new method aims to reduce the scanning and handoff delays,packet loss rate,and also improves the network throughput and prolongs its lifetime,successfully overcoming the problems existing in traditional switching technology.