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Wireless sensor networks consists of small miniaturized Sensor nodes which collect data from their environment and route to a central Base Station. Due to their resource constraint nature, various routing protocols have been design to reduce the consumption of energy of the nodes. In this paper, the authors have presented a brief survey of Cluster-based Hierarchical routing protocols. These protocols organize the nodes into small groups known as Clusters. One node per Cluster is elected as Cluster-Head (CH) in each round to transmit the data to the Base Station. CHs are either selected by the desire node itself or by the Base Station.
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