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by Meshes, Monika Rauch Henzinger, Stefano Leonardi
ftp://ftp.digital.com/pub/DEC/SRC/technical-notes/SRC-1998-010.ps.gz
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Abstract:

This paper studies the multicast routing and admission control problem on unit-capacity tree and mesh topologies in the throughput-model. The problem is a generalization of the edge-disjoint paths problem and is NPhard both on trees and meshes. We study both the offline and the online version of the problem: In the offline setting, we give the first constant-factor approximation algorithm for trees, and an O((log log n) 2)-factor approximation algorithm for meshes. In the online setting, we give the first polylogarithmic competitive online algorithm for tree and mesh topologies. No polylogarithmic-competitive algorithm is possible on general network topologies [8] and there exists a polylogarithmic lower bound on the competitive ratio of any online algorithm on tree topologies [3]. We prove the same lower bound for meshes. 1

Citations

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