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• W2053662057 abstract "In delay tolerant networks (DTNs), the lack of continuous connectivity, network partitioning, and long delays make design of network protocols very challenging. Previous DTN research mainly focuses on routing and information propagation. However, with large number of wireless devices' participation, how to maintain efficient and dynamic topology of the DTN becomes crucial. In this paper, we study the topology control problem in a predictable DTN where the time-evolving network topology is known a priori or can be predicted. We first model such time-evolving network as a directed space-time graph which includes both spacial and temporal information. The aim of topology control is to build a sparse structure from the original space-time graph such that (1) the network is still connected over time and supports DTN routing between any two nodes; (2) the total cost of the structure is minimized. We prove that this problem is NP-hard, and then propose two greedy-based methods which can significant reduce the total cost of topology while maintain the connectivity over time. Finally, we illustrate how the proposed methods can work for undirected DTNs. Simulations have been conducted on both random DTN networks and real-world DTN tracing data. Results demonstrate the efficiency of the proposed topology control methods." @default.
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• W2053662057 date "2011-10-01" @default.
• W2053662057 modified "2023-10-18" @default.
• W2053662057 title "Topology Control for Time-Evolving and Predictable Delay-Tolerant Networks" @default.
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• W2053662057 doi "https://doi.org/10.1109/mass.2011.21" @default.
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