Power-Efficient Seamless Publishing and Subscribing in Wireless Sensor Networks

摘要

Query slipping may happen when a query propagating along a subscribe trajectory moves through a publish trajectory without obtaining desired information, even though two trajectories intersect geometrically. It can result in considerable time delay and in the worst, looping in the trajectory or query flooding the network causing inefficient power consumption and bandwidth utilization because it follows by resubmission of the query or initiation of another subscribe trajectory. In this paper, we consider the trajectory construction for power-efficient seamless publishing/subscribing in a multihop wireless sensor network. We address the problem by dividing each radio cell into smaller virtual grids. For the seamless trajectory development, we propose a grid-based next-hop selection algorithm. Our algorithm not only attempts to make the trajectory straight but also considers the nodal density of recipient nodes and the seamless grid-by-grid multicast. Simulation results turns out that our algorithm dissipates significantly less power, compared to the non grid-based method, as greedy forwarding.