We study a heterogeneous two-tier wireless sensor network in which N access points (APs) collect sensing data from densely distributed sensors and then forward the to M fusion centers (FCs). This node deployment problem is modeled as an optimization with total power consumption of its cost function. The necessary conditions optimal AP FC are explored this paper. provide variation Voronoi Diagra...

Dynamic switching base station (BS) to improve the utilization is very important for reducing the energy consumption. Most of existing dynamic switching BS schemes require the switching threshold to be set in advance. The fixed switching threshold, however, fails to apply in practical two-tier femtocell networks, for it is difficult to precisely model that it may result in different switching o...