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The topic of reducing energy dissipation and prolonging network lifetime in Wireless Sensor Networks (WSNs) has attracted much attention of researchers. A primary obstacle is the hot spot issue which means data forwarding load for nodes near sink is too much and they usually die early. In this paper, the authors propose Circle-Based Data Dissemination (CBDD) algorithm which utilizes mobile sink to relieve hot spot phenomenon. They assume sensor nodes are symmetrically deployed in a circle sensor field and sink moves around the circle. The sink sends a query message to a specific node for sensed data, which begins a data gathering process.
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