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On Approximating Minimum 3-Connected m-Dominating Set Problem in Unit Disk Graph
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DOI：10.1109/TNET.2015.2475335.png)
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Over years, virtual backbone has attracted lots of attention as a promising approach to deal with the broadcasting storm problem in wireless networks. Frequently, the problem of a quality virtual backbone is formulated as a variation of the minimum connected dominating set problem. However, a virtual backbone computed in this way is not resilient against topology change since the induced graph by the connected dominating set is one-vertex-connected. As a result, the minimum k-connected m-dominating set problem is introduced to construct a fault-tolerant virtual backbone. Currently, the best known approximation algorithm for the problem in unit disk graph by Wang et al. assumes k <= 3 and m >= 1, and its performance ratio is 280 when k = m = 3. In this paper, we use a classical result from graph theory, Tutte decomposition, to design a new approximation algorithm for the problem in unit disk graph for k <= 3 and m >= 1. In particular, the algorithm features with (a) a drastically simple structure and (b) a much smaller performance ratio, which is nearly 62 when k = m = 3. We also conduct simulation to evaluate the performance of our algorithm.
Keyword:
3-connected m-dominating set
approximation algorithm
fault-tolerant
Tutte decomposition
virtual backbone
wireless networks
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