CORE: Coordinated Relocation of Sink Nodes in Wireless Sensor Networks

In wireless sensor networks (WSNs), collected data are routed to multiple gateway nodes for processing. Based on the gathered reports, the gateways may also work collaboratively on a set of actions to serve application-level requirements or to better manage the resource-constrained WSN. Some of these actions involve the relocation of some gateways. In this paper, we argue that changing the position of a gateway cannot be pursued without the consideration of the impact on inter-gateway connectivity. We present an efficient algorithm for coordinated relocation of gateways (CORE). CORE strives to maintain communication paths among gateways while repositioning individual gateways to better manage the sensors in their vicinity. Simulation results have demonstrated the effectiveness of CORE and its positive effect on both network longevity and node coverage