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The emerging technology of wireless sensor network (WSN) is expected toprovide a broad range of applications, such as battlefield surveillance,environmental monitoring, smart spaces and so on. The coverage problem is afundamental issue in WSN, which mainly concerns with a fundamental question:How well a sensor field is observed by the deployed sensors? Mobility isexploited to improve area coverage in a kind of hybrid sensor networks. Themain objective for using mobile sensor nodes is to heal coverage holes afterthe initial network deployment, when designing a hole healing algorithm, thefollowing issues need to be addressed. First, how to decide the existence of acoverage hole and how to estimate the size of a hole. Second, what are the besttarget locations to relocate mobile nodes to repair coverage holes? We use thetriangular oriented diagram (HSTT) for aim to goal where its simple, have lowcalculation among construction and it is great to calculate the size of holeexactly .

Hole Detection for Increasing Coverage in Wireless Sensor Network Using Triangular Structure