Research Of Routing Algorithms Based On Energy Efficient For ZigBee Network

ZigBee, a low-cost, low-power consumption, short-distance wireless communication technology, is designed for the low-rate wireless sensor network and control network, so this technology can be used in the application fields of wireless communication such as the industry control, house automatization and medical treatment and so on. Because the ZigBee device is supplied energy by batteries and the energy of the batteries is limited, the lifetime of the ZigBee network is based on the batteries seriously. Therefore, it is important to use the energy of the batteries efficiently in the Zigbee network, and the research of the routing algorithm based on energy efficient for ZigBee network is very significant.In this thesis, first, I introduced the features and some conceptions of the ZigBee network. Then, I gave a detiled introduction to ZigBee tree routing algorithm and AODVjr algorithm, proved some formulations and analyzed the shortcomings of the existing research work. Based on these, I proposed the improved ZigBee tree routing algorithm based on energy-balanced and ZigBee AODVjr algorithm based on control -overhead reduced in the interest of saving the network's energy and prolonging its lifetime.Aiming at the problems of ZigBee tree routing algorithm that the routing may be not optimal and some nodes may use up all the energy because of heavy transmissions, an improved ZigBee tree routing algorithm based on energy-balanced was proposed. The neighbor table was introduced to make sure that the routing is local optimal by considering the routing hops. At the same time, the residual energy of nodes was also considered and the critical energy value C_warning was adjusted in time to avoid selecting some nodes with low residual energy in routing selection phyase.Aiming at the problem of RREQ packets flooding at routing discovery phase in ZigBee AODVjr algorithm, an improved AODVjr algorithm based on control-overhead reduced was proposed. In this improved algorithm, AODVjr algorithm and tree routing algorithm were combined to control the range and the direction of the RREQ packets, and the results show that the forwarding and producing of the RREQ packets can be restricted properly and the energy consumption was reduced efficiently in this improved algorithm.At the same time, we simulated these two improved routing algorithms by OMNET++ simulator and analyzed these simulation results detailed. The simulation results indicate that the energy consumption was reduced efficiently, the problem of unbalance load was resolved and the lifetime of the whole network was maximized in these two improved algorithms.