Construction of strongly connected dominating sets in asymmetric multihop wireless networks

Construction of strongly connected dominating sets in asymmetric multihop wireless networks
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非对称多跳无线网络强连通支配集的构建

DOI:
10.1016/j.tcs.2008.09.058
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发表时间:
2009-03
影响因子:
1.1
通讯作者:
Wu, Weili
Wu, Weili
中科院分区:
计算机科学4区
文献类型:
--
作者:
Li, Deying;Zhang, Zhao;Wan, Peng-Jun;Gao, Xiaofeng;Du, Hongwei;Wu, Weili

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考虑由有向图G=(V,E)表示的非对称无线网络。一个顶点子集U称为强连通控制集(SCDS),如果U诱导的子图是强连通的,并且每个不在U中的顶点在U中既有一个内邻又有一个外邻。SCDS在非对称无线网络中起着虚拟骨干网的重要作用。受小型虚拟骨干网建设的启发,我们研究了最小SCDS问题,即寻找一个有向图的最小SCDS。对于任何常数0<p <1,最小SCDS不存在多项式时间ρ lnn近似,除非NP ≠ DTIME(no(lnn)),其中n是节点数。然而,在文献中提出的最小SCDS的多项式时间算法都不是对数近似。在本文中,我们提出了一个多项式时间(3 H(n−1)−1)-近似算法的最小SCDS,其中H是调和函数。因此,该算法的近似比在任何多项式时间算法可实现的最佳可能近似比的3倍内。
Consider an asymmetric wireless network represented by a digraph G=(V,E). A subset of vertices U is called a strongly connected dominating set (SCDS) if the subgraph induced by U is strongly connected and every vertex not in U has both an in-neighbor in U and an out-neighbor in U. SCDS plays an important role of the virtual backbone in asymmetric wireless networks. Motivated by the construction of a small virtual backbone, we study the problem Minimum SCDS, which seeks a smallest SCDS of a digraph. For any constant 0<ρ<1, there is no polynomial-time ρlnn-approximation for Minimum SCDS unless NP⊆DTIME(no(lnn)), where n is the number of nodes. However, none of the polynomial-time heuristics for Minimum SCDS proposed in the literature are logarithmic approximations. In this paper, we present a polynomial-time (3H(n−1)−1)-approximation algorithm for Minimum SCDS, where H is the harmonic function. The approximation ratio of this algorithm is thus within a factor of 3 from the best possible approximation ratio achievable by any polynomial-time algorithm.
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