Research On Reliable Transmission Routing Protocol For Wireless Sensor Networks Based On Trust Mechanism

Wireless sensor network is a self-organizing network formed by several micro nodes with monitoring and data transmission functions in a specific area,which can transmit monitoring information to users.Early wireless sensor network routing protocols focused on energy saving,but with the change of application environment,the reliability of data transmission becomes very important.Aiming at the abnormal event monitoring scenario,in order to ensure reliable data transmission and balance network energy consumption,a reliable transmission routing protocol based on clustering and trust is proposed.The protocol proposes a trust evaluation model based on node multi index and improves the gradient clustering model,which are applied to the phased transmission routing protocol.The main contents of this paper are as follows:Firstly,the characteristics and applications of wireless sensor networks are described;Design principles,classification and research status of routing protocols in wireless sensor networks;This paper introduces the definition and framework of trust mechanism in wireless sensor networks.Secondly,a trust evaluation model based on node multi index is proposed.From the perspective of ensuring the reliability of calculation results,four measurement indexes are selected.The evaluation node monitors the node behavior in the hybrid mode through the improved watchdog,uses the beta distribution to calculate the forwarding probability of neighbor nodes,and calculates the direct trust combined with the historical trust.The indirect evaluation node is defined,and the evaluation weight is obtained by the interaction times between the indirect evaluation node and the target node.The data of distance measurement and residual energy index are standardized.The entropy weight method is introduced to standardize the four indexes of direct trust,indirect trust,distance measurement and residual energy,obtain the index information entropy,weight the index according to the dispersion of the same index of different nodes at the same time,and calculate the comprehensive trust of neighbor nodes.Thirdly,a reliable transmission routing protocol based on clustering and trust is proposed.In order to balance the network energy consumption,the gradient clustering model is improved,and the gradient division and the number of cluster heads are recalculated.In the stage of cluster formation,the higher the comprehensive trust in each gradient,the priority competition becomes the cluster head node.According to the particularity of abnormal event monitoring network,the network is divided into periodic reporting network and event driven network.In the periodic reporting network stage,the node segments the data packets with the number of remaining energy in the neighbor nodes greater than the energy threshold,and sends the segmented small data packets to the nodes that can transmit data respectively to calculate and update their trust.In the event driven network,in order to ensure timeliness,the node preferentially selects the optimal neighbor node as the next hop data transmission node.Finally,the simulation software OMNe T + + is used to analyze the routing protocol proposed in this paper.By comparing with other routing protocols in packet loss rate,transmission delay and network life cycle.The results show that the protocol proposed in this paper has good performance in ensuring reliable data transmission and balancing network energy consumption.