Compact roundtrip routing in directed networks

  • Authors:
  • Lenore J. Cowen;Christopher G. Wagner

  • Affiliations:
  • Department of Computer Science, Tufts University, Medford, MA;Department of Mathematical Sciences, Johns Hopkins University, Baltimore, MD

  • Venue:
  • Journal of Algorithms
  • Year:
  • 2004

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Abstract

The first sublinear average space universal compact routing schemes for directed networks are presented. For each integer k ≥ 1, they use O(k log n)size addresses; Õ(kn1/(k+1))-sized routing tables on average at each node; and achieve roundtrip routes of stretch at most 2k+1 - 1 in any (weighted) directed network. We also present universal compact roundtrip routing schemes with the stronger requirement that they use sublinear maximum space at every node. These schemes also use O(k log n) size addresses and achieve roundtrip routes of stretch at most 2k+ 1 -1 in any (weighted) directed network, and they bound the maximum sized table at each node by Õ(kn(3k+1)/(2ċ3k)).