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One of the important issues in wireless sensor network is inherent limited battery power within network sensor nodes. Minimizing energy dissipation and maximizing network lifetime are important issues in the design of sensor networks. There are various routing protocols like flat routing protocols, location-based, QoS based, hierarchical routing, etc. in which optimal routing can be achieved. Hierarchical routing (cluster-based routing protocols) have shown to be more scalable and energy-aware. The basic idea of clustering is to use information aggregation mechanism in the cluster head to reduce the amount of data transmission, thereby, reduce the energy dissipation in communication.
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