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In Wireless Sensor Network (WSN), it is necessary to optimize the energy of the sensor node. Each sensor node is equipped with a battery which is used for sensing and processing the data. Cluster based data aggregation and transmission reduce the communication overload by eliminating the redundant data transmission. In this paper, an energy efficient hierarchical data aggregation technique based on Optimized Cluster Algorithm Based on Target Routing (OCABTR) is proposed. In this approach, data aggregation is performed twice in order to reduce the data size so that network life time can be increased.
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