, Volume 61, Issue 4, pp 1000–1021

Tighter Approximation Bounds for Minimum CDS in Unit Disk Graphs



Connected dominating set (CDS) in unit disk graphs has a wide range of applications in wireless ad hoc networks. A number of approximation algorithms for constructing a small CDS in unit disk graphs have been proposed in the literature. The majority of these algorithms follow a general two-phased approach. The first phase constructs a dominating set, and the second phase selects additional nodes to interconnect the nodes in the dominating set. In the performance analyses of these two-phased algorithms, the relation between the independence number α and the connected domination number γc of a unit-disk graph plays the key role. The best-known relation between them is \(\alpha\leq3\frac{2}{3}\gamma_{c}+1\). In this paper, we prove that α≤3.4306γc+4.8185. This relation leads to tighter upper bounds on the approximation ratios of two approximation algorithms proposed in the literature.


Wireless ad hoc networks Connected dominating set Approximation algorithm Geometric analysis 


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Computer ScienceCity University of Hong KongHong KongHong Kong SAR
  2. 2.Department of Computer ScienceIllinois Institute of TechnologyChicagoUSA

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