Research On Wireless Sensor Networks Clustering And Secure Routing Protocols

Routing protocols are one of the most important technologies in Wireless Sensor Networks.Because of the challenges of energy limitation and security threats of sensor nodes,it is necessary to fully consider the energy consumption of nodes and the security requirements when designing routing protocol,which can ensure network security and extend the life cycle of the network.In this thesis,by means of researching the wireless sensor network and wireless sensor network routing protocols,based on the energy consumption and security of WSNs,this thesis proposes the cluster routing protocol based on improved particle swarm optimization algorithm in WSNs and WSNs secure routing protocol based on dynamic update of trusted value.The main research contents are as follows:(1)In order to solve the problem that the location distributions of cluster head nodes in WSNs are unbalanced,the data transmission modes of forwarding nodes are unreasonable,and the data transfer increases computational overhead,communication overhead and the energy consumption of nodes,this thesis proposes a WSNs routing protocol based on improved particle swarm optimization algorithm.In the process of cluster head election,the protocol constructs a new fitness function by considering the cluster head node energy factor and position equalization factor,introducing particle swarm optimization algorithm and optimizing learning factor and inertia coefficient;the routing mode establishes the most energy-efficient data transmission path for the forwarding node.Experiments show that the protocol can balance the global search ability and local exploration ability of the algorithm,select cluster head nodes and forwarding nodes with more balanced energy and position,nodes consume less energy and are more balanced,effectively extend the life cycle of the network.(2)Aiming at the security and reliability problem of routing node selection,this thesis presents a highly trusted Wireless sensors networks secure routing protocol based on node value dynamic update.This protocol assesses communication and energy consumption changes between nodes,adopts a trust evaluation method which contains the direct trust value based on improved Bayesian formula and the indirect trust value based on the filtering mechanism as the basis for subsequent routing.According to the clustering method based on the improved particle swarm optimization algorithm,the strategy of electing the final cluster head node from three perspectives of network security factor,energy factor and distance equalization factor is constructed to ensure the reliability of cluster head node selection.Experiments show that the trust evaluation of nodes follows the rules of rapid decline and slow growth;the routing protocol based on trust evaluation effectively eliminates attacks by malicious nodes,which is strong in security and low in network energy consumption.