The Research And Application Of Wireless Sensor Networks Based On ZigBee

ZigBee is a rising wireless network technology featuring short distance, lowcomplexity, low power consumption, low data rate, low cost. Nowadays, it has beenthe optimal network protocol utilized in Wireless Sensor Networks.In Dec. 2004, ZigBee Alliance released the 1st edition specification. It specifiedNetwork Layer, Application Layer and Security Service on the basis of PhysicalLayer and Medium Access Control Sublayer which were specified by IEEE 802.15.4standard. It is mainly used in the field of industry, family and medical science whereneed wireless communication. In these applications, position monitoring of mobilenodes is the main aspect. Therefore, the support of ZigBee network for mobile nodesis a key research. The join and handoff mechanism of ZigBee network mobile nodesare researched by using NS2 and the hard handoff and soft handoff mechanism areproposed according to simulation results to improve the support capability of ZigBeefor mobile nodes.The design of ZigBee network orienting position monitoring are proposed byutilizing IP-Link module of Helicomm, which defines structures, functions andsoftware and hardware designs of four network devices--fixed nodes, mobile nodes,mobile monitoring nodes and network control nodes. Testing experiments are carriedout in five rooms. The results indicate that the design of ZigBee networks orientingposition monitoring is effective and it could be a basic network model and provide thesolution for position monitoring of ZigBee network.