Design And Implementation Of WSNs Topology Management System And LEACH-DN Algorithm

Topology control technology of WSNs(Wireless Sensor Networks) is one of the core technologies of wireless sensor networks. The aim of topology control is to conserve energy of WSNs, avoid collision, and to improve network performance and so on. Excellent topology control method can not only prolong the survival time of the sensor network, reduce the energy consumption of the sensor network, improve efficiency of MAC protocols and routing protocols, but also provide foundation for time synchronization, data fusion and targeting. Therefore, topology control technology of WSNs is one of the hot technologies currently being researched.This thesis studies the basis of topology control technology of WSNs and proposes LEACH-DN(Low Energy Adaptive Clustering Hierarchy based on Distance and Neighbor) algorithm based on LEACH algorithm for large-scale intensive network. First, the number of clusters is determined. The deployment area of the sensor network is divided into cells in some way. One or two cluster heads are formed in each cell. A minimum spanning tree MST is established among cluster heads. The choice of the root takes the number of neighbor nodes and the distance between cluster head and base station into account.This thesis designs and implements the WSNs topology management system. Users can manage the topology of sensor network through this system and simulate some topology control algorithm. Features of the system include topology collection, topology display, resetting topology, topology update, algorithm verification, topology simulation and so on. Users send commands via the UI interface. Then commands are sent to the sensor network from the base station. Sensor nodes receive these commands and perform the appropriate actions.The simulation results of LEACH-DN algorithm show that under the default network environment, LEACH-DN algorithm has better performance in energy consumption of cluster heads and the network lifetime than LEACH algorithm, which balances energy consumption of nodes and extends the lifetime of the network. Topology management system has been verified and tested to meet the expected requirements of the system that the sensor network topology is simulated and managed effectively.