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Opportunistic networks (Oppnets) provide the communication facilities in the network scenarios where the end-to-end path between the source and the destination never exists or may last only for an unpredictable and very short period of time. The disconnections and re-connections between the nodes are very common in Oppnets. In this paper, the authors have simulated, investigated and compared the performance of various already existing routing protocols for infrastructure-less Oppnets in terms of energy consumption. These protocols have been compared with each other by using various performance evaluating factors like average residual energy, number of nodes that become dead after the simulation run of the protocol.
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