Abstract: This paper improved the protocol based on traditional LEACH protocol,and two influence factors called the residual energy and the number of elected cluster head of the nodes were introduced to make the clustering more ideal.Because the nodes forward data through multi hop in traditional methods of collecting data,and some of the nodes energy rapid depletes due to forward data to other nodes,this paper proposed a new strategy DCST that leads mobile sink into wireless sensor networks,and let it move along the planning optimal track to collect data.DCST uses the ant colony algorithm to find out the optimal path which connects all the cluster heads and lets the mobile sink move along this path to collect data based on clustering the WSN with the improved LEACH protocol.Optimizing and comparing the moving speed of mobile sink,we find out the ideal moving speed.Simulation results show that compared to the traditional Leach algorithm and other improved algorithm,the improved LEACH protocol and DCST can prolong the network life cycle more effectively and reduce the energy consumption of the whole network.

Key words: Top optimalizing track,Mobile sink,LEACH protocol,WSN,Data collection