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In sensor-target surveillance networks, sensors are typically powered by batteries with limited energy and hence it is important to manage the energy usage. In the paper, several methods have been proposed to maximize the lifetime of these networks. The authors observe that some surveillance applications have lifetime requirements. For example, a surveillance network is used to monitor the precious items in an exhibition and its lifetime must be at least equal to the duration of exhibition. For these surveillance applications, it is desirable to minimize the network cost while fulfilling the given lifetime requirement. In this paper, they address a new problem in which the network cost is minimized while the resulting lifetime is at least equal to a given value L.
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