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Fixed charge multicommodity network design using p-partition facets


  • Agarwal, Y.K.
  • Aneja, Y.P.


We are given an undirected network G[V, E] and a set of traffic demands. To install a potential edge e ∈ E we incur a cost Fe to provide a positive capacity ae. The objective is to select edges, at minimum cost, so as to permit a feasible multicommodity flow of all traffic. We study structure of the projection polytope of this problem, in the space of binary variables associated with fixed-charges, by relating facets of a p node problem (p=2,3, or 4), defined over a multi-graph obtained by a p-partition of V, to the facets of the original problem. Inspired from the well-known “cover” inequalities of the Knapsack Problem, we develop the notion of p-partition cover inequalities. We present necessary and sufficient conditions for such inequalities to be facet defining for p = 3 and 4. A simple heuristic approach for separating and adding such violated inequalities is presented, and implemented for p values up to 10. We report optimal solutions for problems with 30 nodes, 60 edges, and fully dense demand matrices within a few minutes of cpu time for most instances. Some results for dense graph problems are also reported.

Suggested Citation

  • Agarwal, Y.K. & Aneja, Y.P., 2017. "Fixed charge multicommodity network design using p-partition facets," European Journal of Operational Research, Elsevier, vol. 258(1), pages 124-135.
  • Handle: RePEc:eee:ejores:v:258:y:2017:i:1:p:124-135
    DOI: 10.1016/j.ejor.2016.09.015

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    References listed on IDEAS

    1. T. L. Magnanti & R. T. Wong, 1984. "Network Design and Transportation Planning: Models and Algorithms," Transportation Science, INFORMS, vol. 18(1), pages 1-55, February.
    2. Herrmann, J. W. & Ioannou, G. & Minis, I. & Proth, J. M., 1996. "A dual ascent approach to the fixed-charge capacitated network design problem," European Journal of Operational Research, Elsevier, vol. 95(3), pages 476-490, December.
    3. Gendron, Bernard, 2002. "A note on "a dual-ascent approach to the fixed-charge capacitated network design problem"," European Journal of Operational Research, Elsevier, vol. 138(3), pages 671-675, May.
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