Research On Routing Protocol Of WSN Based On Energy And Delay Time Optimization

Wireless sensor network is a intelligent information system which integrates information collection, information transmission, information process,it can be widely used in military, environment, healthcare, manufacturing and other important fields. Due to the miniaturization of sensor nodes, most of sensor nodes are supplied by the battery which has the limited energy, and is difficult to be replaced because of physical limitations, so the limitation of nodes’energy is the most critical constraint for the design of wireless sensor network. Most of sensor nodes’energy is consumed in the communication module, the key and difficulty of wireless sensor network research is how to communicate effectively and prolong the network lifetime, the design of routing protocols is an important part of efficient communication,also is the core technology of wireless sensor network.This paper introduces two kinds of routing protocol, one is a kind of plane routing protocol, which considers the energy and the delay time, the other is hierarchical routing protocol, which is an improvement of LEACH protocol. Details are as follows:The first chapter describes the network graph theory and the architecture of wireless sensor networks, characteristics and applications.The second chapter introduces the background and significance of this paper, as well as the research status at home and abroad firstly. Then it describes the designing requirements and the technical challenges of routing protocols in wireless sensor network, introduces the classification of routing protocol, detailedly analyses several typical routing protocols from three aspects of routing mechanism,advantages and disadvantages.The third chapter puts forward a plane routing mode which considers two respects of energy optimization and reducing the time delay. By adjusting the parameters to adjust the weight of energy and time delay,it can meet the requirements of practical applications,and find the optimal path using the dynamic programming method.Illustrated by a numerical experiment.Through the analysis of LEACH protocol,the fourth chapter summarizes its shortcomings, makes improvements in terms of data transmission.this paper presents a multi-hop transmission method which balances cluster heads’energy consumption,this method bases on a conversion method in network graph theory, cluster heads will be divided, this transmission method considers two factors on residual energy of cluster heads and energy consumption between cluster heads.Simulation shows the network lifetime longer than LEACH protocol. the fifth chapter summarizes this research, and points out some issues of wireless sensor network are needed further study.