Research On Clustering Routing Protocol Optimization In Wireless Sensor Networks

With the continuous development of network information and wireless communication technology,the research field of wireless sensor network technology has received more attention.The routing protocol technology is one of the hot issues in today's wireless sensor network research.The hierarchical routing protocols divide the network structure into layers,improve the network structured management.The basic framework and main characteristics in wireless sensor network are summarized.The characteristics,performance,and application areas of several typical routing protocols are compared.Meanwhile,the security requirements and targets in wireless sensor network are studied.The energy efficiency and network security problems in existing hierarchical routing protocols are analyzed.And two algorithms of routing protocols based on cluster structure in wireless sensor network are proposed,in order to solve these problems.Firstly,clustering routing protocol based on nonlinear Particle Swarm Optimization algorithm: the proposed algorithm's network structure based on cluster heads,relay nodes and common nodes.The cluster heads aggregate the data from common node to reduce the data redundancy,and improve the data transmission efficiency.The relay nodes send data to the base station.The cluster heads' and relay nodes' elections using the improved PSO are executed in the base station.The nonlinear dynamic adaptive inertia weight is used instead of the original linear weight,adjust the local search and global search ability,and accelerate the convergence speed.The fitness functions of the cluster heads and relay nodes take the nodes' remaining energy and distances into consideration,and optimal nodes are selected more reasonably.Simulation results show that The proposed algorithm improves the energy efficiency,compared to LEACH-C,EEUC,EBUCP.Secondly,clustering routing algorithm and security detection mechanism based on dynamic double cluster heads: the proposed algorithm has two optimizations.On the one hand,the agent cluster heads communicate with main cluster heads continuously,and replace the main heads' tasks which are in bad condition,to save the time loss which results from cluster nodes' selection in each round.In the aspect of network security,a efficient,fast and feasible detection mechanism of network security is proposed,which includes two-way detection mechanism between agent cluster heads and common nodes and the feedback detection mechanism of main cluster head,to take data transmission security and integrity into account.Compared with LEACH-R and EBUCA,the proposed algorithm performs well in energy efficiency and network security.