Weakly-Connected Dominating Sets and Sparse Spanners in Wireless Ad Hoc Networks

  • Authors:
  • Khaled M. Alzoubi;Peng-Jun Wan;Ophir Frieder

  • Affiliations:
  • -;-;-

  • Venue:
  • ICDCS '03 Proceedings of the 23rd International Conference on Distributed Computing Systems
  • Year:
  • 2003

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Abstract

A set S is dominating if each node in the graph G =(V,E) is either in S or adjacent to at least one of thenodes in S. The subgraph weakly induced by S is the graphG' = (V,E') such that each edge in E' has at least one endpoint in S. The set S is a weakly-connected dominating set(WCDS) of G if S is dominating and G' is connected. G'is a sparse spanner if it has linear edges. In this paper, wepresent two distributed algorithms for finding a WCDS inO(n) time. The first algorithm has an approximation ratioof 5, and requires O(n log n) messages. The second algorithmhas a larger approximation ratio, but it requires onlyO(n) messages. The graph G' generated by the second algorithmforms a sparse spanner with a topological dilationof 3, and a geometric dilation of 6.