Research On Cooperative Transmission Method In Event-Driven Dynamic Clustering Network

In order to reduce the energy consumption of large-scale wireless sensor networks,the networks are often divided into clusters of different sizes for data transmission.Each cluster member transmits data to the cluster head,and the cluster head fuses the data and sends it to the sink node to reduce the energy consumption of each node.In the monitoring of emergencies,such as fire,mountain torrent,fuel leakage,etc.,the probability of occurrence is very small.In order to further reduce the energy consumption of nodes,an event-driven transmission method is proposed.When no event occurs,each node sleeps or sends report information to the cluster at a very low frequency.When an event occurs,some nodes will be awakened and send the collected data to the sink node at high frequency.In the monitoring of emergency events,once the event occurs,the reliability of data transmission will directly affect the subsequent decisions,and in serious cases,it may affect the safety of people's lives and property.In order to improve the transmission reliability of the system,a cooperative transmission method based on event-driven dynamic clustering network is proposed in this paper.On this basis,a dynamic clustering method based on node density is proposed for non-uniform network.Its main work is as follows:1.According to the occurrence of event,the data transmission process is divided into two states: static cluster transmission and event cluster transmission.In the transmission of event cluster,the size,moving speed and direction of the event are defined according to the translation characteristics of the event.According to the movement of events,a dynamic event cluster is constructed.In dynamic events cluster,in order to ensure the reliable transmission of data,according to the different location of the node in the network coordination effect is different,in the event on the direction of mobile node is closer to the event center and gathering,from the field to select the best relay to better implement the cooperative transmission,thus put forward the best relay selection method based on the forward channel,in order to better for data forwarding.Simulation results verify the effectiveness of the proposed cooperative transmission method based on event-driven dynamic clustering network.2.In the network with uneven node distribution,if the cluster is evenly divided according to the size of the region,when data transmission is carried out,the cluster head transmission task in the node dense region is heavy and the energy consumption is large.In order to solve this problem,the parameter of node density is introduced to divide the static clusters when no events occur,and the network is divided into initial static clusters of different sizes.When an event occurs,the node tightness is defined,and a dynamic clustering method based on node tightness is proposed.On the dynamic cluster of cluster heads selection,given the tightness of more nodes and node around the average distance closer,each round consumes less energy,data transmission is presented based on the tightness of the cluster head node selection strategy,from the event area selected node tightness biggest was elected to the cluster head nodes,data forwarding missions.Simulation results show that the proposed method can balance and reduce the energy consumption of the network,and prolong the life cycle of the network.