Research On Performance Optimization Of Wireless Sensor Networks

In recent years,wireless sensor networks(WSNs)are widely used in environmental monitoring ? medical monitoring ? field rescuing ? intelligent transportation ? marine exploration and other fields,and it has broad application prospects.WSNs is composed of several sensor nodes,and they are organized to the whole network system by self-organization.When a sensor receives the environmental information,it can be transmitted to the other sensor networks through the network link.Meanwhile,the UAV can assist the sensor networks to carry out stable and reliable network transmission.By supplementing energy or transmitting data for sensor nodes,the problems of limited energy and unstable transmission in wireless sensor networks can be solved.Therefore,the combination of the technology of UAV flight and sensor networks is of great significance to the performance optimization of sensor networks in the future.The main contents of this paper are as follows:(1)In the actual application scenario of sensor networks,the redundancy of sensor nodes may lead to the high network deployment cost or the low network communication efficiency.Therefore,this paper proposes a relay node deployment algorithm in the heterogeneous wireless sensor networks,which can improve the deployment mode of relay nodes in heterogeneous environment.It first uses the distance between the two nodes and the properties of nodes to define the weight of edges.And then,it combines with the incremental graph theory to change the judgment conditions when adding the relay nodes.These can reduce the number of relay nodes which are deployed in the same environment and save the cost of network deployment.(2)Aiming at the problem of communication interruption caused by the unstable environment in wireless sensor networks,this paper designs an optimized joint UAVsensor mechanism algorithm.It first divides the sensor nodes into several clusters,and then allocates the UAV services to each cluster and carries out the signal transmission at the appropriate time.Therefore,the wireless sensor system can complete the task with less energy consumption.In addition,it also designs the communication trajectories between multiple UAVs and sensors,and optimizes the transmission rate to ensure that each sensor can send data with low outage probability when it is in the working state,so as to save the transmission energy.(3)UAV is gradually applied to the energy supplement of sensor networks because of its mobility and low cost.However,the energy consumption of sensor networks is uneven in many special situations.Based on the advantages of UAV and the characteristics of sensor networks,the energy density of sensor networks and the energy efficiency of UAV can be combined to achieve the energy balance in sensor networks.So an algorithm is proposed to promote the energy balance of sensor networks,so as to prolong the network life.