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The sensors in the wireless sensor network are resource constraint devices. The sensors are powered by batteries which is the most critical resource with the sensors. The limited battery limits the lifetime of the entire network. Due to more workload, some nodes die quickly which can affect the connectivity and coverage of the network. So the residual energy with remaining nodes gets wasted. Reduction in unnecessary energy consumption, clustering, mobility, use of proper transmission policy and proper transmission distance helps to reduce the wastage of energy. This paper studies such strategies that reduce the power consumption and ultimately improve the network lifetime and in next section the authors propose an energy aware protocol for wireless sensor network.
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