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Wireless sensor networks have profound effects on many application fields, whereas applications in mobility scenarios need an immediate, fast, secure and energy-efficient route. In this paper, the authors build a secure tree-structure route for mobility scenarios in the large-sized wireless sensor networks with only a resource-constrained sink node. After mobile nodes securely rejoining the network, they can adapt the network topology changes by moving the sink node and reconstructing the route. Analysis shows that the routing scheme is energy-efficiency in terms of computation, communication and storage.
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