Trade-Offs between Density and Robustness in Random Interconnection Graphs

  • Authors:
  • Philippe Flajolet;Kostas P. Hatzis;Sotiris E. Nikoletseas;Paul G. Spirakis

  • Affiliations:
  • -;-;-;-

  • Venue:
  • TCS '00 Proceedings of the International Conference IFIP on Theoretical Computer Science, Exploring New Frontiers of Theoretical Informatics
  • Year:
  • 2000

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Abstract

Graphs are models of communication networks. This paper applies combinatorial and symbolic-analytic techniques in order to characterize the interplay between two parameters of a random graph: its density (the number of edges in the graph) and its robustness to link failures, where robustness here means multiple connectivity by short disjoint paths. A triple (G, s, t), where G is a graph and s, t are designated vertices, is called l - robust if s and t are connected via at least two edge-disjoint paths of length at most l. We determine here the expected number of ways to get from s to t via two edge-disjoint paths in the random graph model Gn,p. We then derive bounds on related threshold probabilities pn,l as functions of l and n.