Data networks are subject to congestion, thereby the delay to go across the network may be large enough in order to dishearten customers to keep on using such a network. In this paper we address the problem of determining in a given network a routing which minimizes the delay or keeps it under a certain bound. This problem was already shown as N P complete.… (More)
Given a bidirected ring with capacities and a demand graph, we present an approximation algorithm to the problem of finding the minimum α such that there exists a feasible unsplittable routing of the demands after multiplying each capacity by α. We also give an approximation scheme to the problem.