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Energy management in sensor networks is a critical issue to prolong the network lifetime. However, the end-to-end latency increases due to energy saving algorithms. It proposes a new protocol, ELS (Energy efficient low Latency Sleep Schedule for Target Tracking Sensor networks), that provides a dynamic sleep schedule for the radios to increase the network lifetime as well as transmit the target's information to the sink with low end-to-end latency. In the surveillance state, the radios of interior nodes are put into sleep using a static schedule. If a target arrives, radio schedule of the nodes nearby the target is dynamically changed to wake up the neighbors and start sensing before the target reaches their location.
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