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We deal with a natural integer-linear programming formulation of the routing and spectrum allocation (RSA) problem in elastic optical networks. We focus on strengthening the formulation with valid inequalities (cuts). For this purpose we apply clique inequalities that proved to be useful in other applications of this kind. We develop and combine a clique cut generation procedure with a column generation...
Overlay communication networks create logical structures at the top of the Internet. Such a concept is also an efficient approach in the context of multicast applications. Moreover, the overlay multicast has actually outperformed network layer-based multicast provided by the IP protocol and attracted developers of multimedia systems, recently. In this paper, we take a look at modeling techniques and...
In the paper we present integer programming (IP) optimization models for flexgrid elastic optical networks (EON). We consider several different basic assumptions regarding flexibility of EON that lead to a variety of IP formulations differing in precision and complexity. As usual, detailed models aiming at precisely describing technological aspects of EON suffer from tractability issues resulting...
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