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Ad hoc network is a collection of nodes which move independently and freely to communicate with other node through wireless links. These networks are logically represented as a set of clusters by grouping nodes which are in close proximity with one another. Clusterheads form the backbone and this clusterhead is used to route packets from one node to other nodes in the cluster. Independent nodes are supposed to have non-deterministic mobility pattern. Different heuristics use different policies to select clusterheads. Many of these strategies are in favor of some node and these nodes show greater responsibility and try to deplete their energy faster, it lead them to drop out of the network.
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