Improvement Of Leach Protocol In Wireless Sensor Network Research

Wireless Sensor Networks(WSN for short) is a new type of wireless communication network,It has characteristics like the number of nodes in network is much,the energy of nodes is limited,the topology of network changes quickly. It can monitor,perceive,gather,process the physical quantity of forested region, and transfer the data to task manager node through wireless communication way. It demonstrates comprehensive application prospects, and this new technology causes attention of related academia and companies. Because WSN has the characteristics of limited energy, to raise energy utilization efficiency of WSN, prolong the network survival time to achieve the purpose of gathering and monitoring the physical quantity is becoming a hot spot in Wireless Sensor Network. This paper analyzes the current routing protocols of WSN, with the problems of high energy consumption and short network survival time of these protocols, make research on how to improve the classical clustering routing protocol LEACH(Low-energy Adaptive Clustering Hierarchy) ,and the improved algorithm is called LEACHTDE(Topology Dynamic energy Efficient clustering algorithm), it do research on cluster head election mechanism,the formation algorithm of clusters and the routing algorithm of adjacent clusters , the paper contributes to the following aspects:Firstly, As LEACH has the shortcomings of high energy consuming in cluster head election,imbalance of cluster energy consuming , this paper presents new cluster heads election mechanism, and it can reduce the energy consuming of cluster formation.As Traditional clustering algorithm presumes that network is immobile, all nodes don't change their location during the network survival time, and its scope of application is limited. This paper do research on cluster formation process, make improved algorithm supports the nodes of network change location or die during the network lifetime, expands the application scope of this algorithm.LEACH use one-hop data transmission during communication of clusters, and it consumes more energy, This paper presents multi hop transmission based on distance factor, makes information transmission between cluster heads through multi hop and reduces data quantity, balances network energy consumption and prolong network lifetime.Finally, we compare LEACHTDE with LEACH from number of nodes alive and network energy consumption at different times. The result shows LEACHTDE can improve network energy efficiency , prolong network survival time, so we achieved the anticipated goal.