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In-operation network planning consists in re-optimizing a network, currently being operated to transport traffic, either minimizing resource utilization or maximizing the transported traffic. In the context of flexgrid optical networks re-optimization includes spectrum defragmentation, virtual topology reconfiguration, etc. To perform in-operation planning, a centralized element in the control plane...
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...
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...
The requirement of executing network re-optimization operations to efficiently manage and deploy new generation flexgrid-based optical networks has brought to light the need of some specialized PCEs capable of performing such high time-consuming computations. The objective of such re-optimizations is to compute network reconfigurations to be done based on the current state of network resources to...
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