Research And Simulation Of Energy Efficient Topology Control In Wireless Sensor Network

A wireless sensor network (WSN) consists of a large number of low-cost micro sensor nodes deployed in the monitored area. These nodes will form a self-organized multi-hop network by wireless communication, which aims to collect and process real-time environmental information, then forward the results to its users. The prospect of sensor network application is very wide. It can be used in military, environmental monitoring and forecasting, health and other fields. With the in-depth research and extensive application of sensor network, sensor network will gradually penetrate all areas of human life.As the energy of sensor is limited, therefore, it is an important challenge that how to use energy efficiently to maximize the lifetime of the whole network system. This thesis proposes three strategies to use energy efficiently, and then to extent the network lifetime. First, we propose a normal non-uniform distribution strategy, which can effectively balance the network energy consumption, and improve energy efficiency of the whole network. Second, based on normal non-uniform distribution, we propose an efficient energy topology control strategy (EETC). which tries to minimize the number of active nodes, reduce the redundant information gathered by sensor nodes, and improve energy efficiency under the condition of keeping the coverage of original networks. Finally, based the EETC, we propose the PBPR (probability based routing protocol), which uses the neighbor table generated by EETC. Therefore, we can reduce the energy used by generating and maintaining routing table, and improve the lifetime of network.The results of NS2simulation show that combining these three strategies can greatly improve network energy efficiency, and extend the network lifetime.