Research On Routing Protocol For Wireless Sensor Networks With Mobile Sink

Wireless sensor network(WSN)is a distributed self-organizing communication network,which is composed of a large number of sensor nodes placed in the specific area.The sink node in the network receives the perceptual data from other nodes,and the user can obtain the entire network data from the sink node.The network routing protocol provides the data transmission and routing,which directly affects the performance of the network,so it is necessary to research the routing protocol.In the early wireless sensor networks,the sink nodes are fixed,which makes the nodes around the sink send large amount of other nodes' perceptual data,which makes their load heavier and easier to die.However,due to the limitation of the network working environment,it will be very difficult to supply energy to the nodes,which seriously affects the normal operation of the network.The sink node can move data directly to the source node to reduce the data transmission distance and energy consumption.It also avoids premature death of nodes around the sink due to forwarding large amounts of data.In this paper,a wireless sensor network routing protocol based on mobile sink is research.Firstly,this paper researches the structure and routing protocols of wireless sensor networks,classifies protocols,analyzes and compares typical protocols in detail,and then researches the routing protocols of wireless sensor networks based on mobile sink and the design strategy for mobile sink.Secondly,this paper analyzes the advantages and disadvantages of LEACH(Low-Energy Adaptive Clustering Hierarchy)protocol,and proposes an improved clustering algorithm for its lack of random clustering.The improved clustering algorithm uses the minimization of network energy consumption to get the best Cluster head count and cluster head probability.The cluster head is elected according to the optimal cluster head probability and the residual energy of the node and its distance from the sink node.The energy consumption of the cluster head can be equalized to prolong the network lifetime.The simulation results show that the improved clustering algorithm can prolong the network lifetime,balance the energy consumption of the network and improve the data receiving capacity of the sink node to a certain extent.Finally,the improved clustering algorithm based on LEACH protocol is applied to wireless sensor network based on mobile sink,and proposes a new routing protocol based on energy balance called MSRPECB(Mobile Sink Routing Protocol based on Energy Consumption Balance).In this protocol,using the modified algorithm which change the cluster head distance from the sink node to the cluster head distance from the center of the network to cluster and elect cluster head,then sink node moves to the cluster head position to receive the data.Finally,the sink node's trajectory is combined to optimize the line segment,which can further shorten the length of the track,so that the sink can receive more data in the same time,improve the efficiency of information transmission.The simulation results show that the MSRPECB protocol can effectively balance the network energy consumption,prolong the network survival time and increase the amount of data received by the sink node.