Distribution of sink-node´s operation for on-demand information retrieval in wireless sensor networks

In the on-demand information retrieval from sensor network, it is difficult to utilize data collection infrastructures such as clusters and grid, which are mainly used in the proactive (continuous) information retrieval. A sink node plays an essential role to serve as on-demand query broadcaster and data collector, becoming a traffic bottleneck in the network. In this paper, we study the distribution of sink operation among sensor nodes to achieve energy-efficieny and alleviate the bottleneck problem. We introduce the basic S3(sink-sink_proxy-sensors) model and shows its impact on the energy bottleneck problem in wireless sensor network. We specify the criteria of selecting effective sink proxies that enable both balanced and low energy consumption in data query and collection.