Path-shrinking sink mobility in wireless sensor networks

Wireless sensor network with mobile sink is currently under study. In this paper, we propose a novel sink mobility problem called OSM in these networks. Then we present a solution called PSSM to this problem. According to PSSM, sinks dynamically move toward traffic sources in a way to reduce average hop count. Our simulation experiments show that applying PSSM to the LURP routing protocol effectively reduces average packet delay, average hop count, and energy consumption in comparison with the original LURP.