期刊
IEEE TRANSACTIONS ON COMPUTERS
卷 65, 期 5, 页码 1663-1670出版社
IEEE COMPUTER SOC
DOI: 10.1109/TC.2015.2451621
关键词
Throwbox optimization; topology design; delay tolerant networks
资金
- National Natural Science Foundation of China [61370192, 61432015, 61428203]
- US National Science Foundation [CNS-1319915, CNS-1343355]
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1343355] Funding Source: National Science Foundation
- Direct For Computer & Info Scie & Enginr
- Division Of Computer and Network Systems [1319915] Funding Source: National Science Foundation
One of the solutions to improve mobile Delay Tolerant Network (DTN) performance is to place additional stationary nodes, called throwboxes, to create a greater number of contact opportunities. In this paper, we study a key optimization problem in a time-evolving throwbox-assisted DTN: throwbox selection, to answer the questions such as how many active throwboxes do I need? and which throwboxes should be activated? We formally define two throwbox optimization problems: min-throwbox problem and k-throwbox problem for time-evolving DTNs modeled by weighted space-time graphs. We show that min-throwbox problem is NP-hard and propose a set of greedy algorithms which can efficiently provide quality solutions for both challenging problems.
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