In recent years, barrier coverage problem in directional sensor networks has been an interesting research issue.Most of the existing\r\nsolutions to this problem aimto find as many barrier sets as possible to enhance coverage for the target area, which did not consider\r\nthe power conservation. In this paper, we address the efficient sensor deployment (ESD) problem and energy-efficient barrier\r\ncoverage (EEBC) problem for directional sensor networks. First, we describe a deployment model for the distribution of sensor\r\nlocations to analyzewhether a target area can be barrier covered. By this model,we examine the relationship between the probability\r\nof barrier coverage and network deployment parameters. Moreover, we model the EEBC as an optimization problem. An efficient\r\nscheduling algorithm is proposed to prolong the network lifetime when the target area is barrier covered. Simulation results are\r\npresented to demonstrate the performance of this algorithm.
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