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Maximizing network lifetime while not sacrificing coverage and connectivity in Wireless Sensor Networks (WSNs) has attracted many researches during the past few years. In this paper, the authors introduce a new Hole-tolerant Redundancy Scheme (HRS) which can prolong network lifetime while maintaining coverage and connectivity performance. This HRS scheme can tolerate some coverage holes when determining redundancy eligibility, so it shuts down more nodes when hole tolerance is higher. Their work takes into account both homoradius WSNs and heteroradius WSNs. The simulation results show that: the average coverage percentage varies mildly but network lifetime is prolonged as hole tolerance increases; HRS outperforms several existing lifetime maximization schemes.
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