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Maximizing the life time of wireless sensor networks through various techniques has been the focus of the number of researchers for almost a decade. The techniques so far used have focused on various power aware algorithms and encryption techniques used for the communication between the nodes. Numerous studies earlier have resulted in various mathematical models for deriving bounds on the operating lifetimes of the sensor nodes. However most of the earlier work did not consider the role of the battery dynamics in determining the life time of the sensor nodes. And in most of the cases from the published results from actual deployment indicate that in practice , sensor node lifetimes are far lower than expected due to premature drain of batteries. This reveals an important fact that even the battery itself has an important role to play in determining the life time of the sensor node. It is important to discharge the battery in a systamatic way that maximizes the amount of charge extracted from it. In this paper a survey of all the models presented by the researchers is presented and concludes with suggesting a possible method by which the life time of the sensor node can be further extended.

Maximizing the Life Time of Wireless Sensor Networks: A Survey with a possible solution to further enhance the life time of WSNs