Date Added: Apr 2011
Controlled sink mobility has been shown to be very beneficial in lifetime prolongation of Wireless Sensor Networks (WSNs) by avoiding the typical hot-spot problem near the sink. Besides striving for elongated lifetimes, many applications of WSNs are time-sensitive, i.e., they strongly benefit from bounds on the message transfer delay. Further, large WSNs require multiple sinks in order to scale well with respect to delay and lifetime. Therefore, it becomes very interesting to investigate how to plan the trajectories of multiple mobile sinks such that lifetime and delay goals are met simultaneously. To that end, the authors propose a geometrically principled heuristic for finding good trajectories of multiple mobile sinks in large-scale, time-sensitive WSNs.