Exact solution of the full RMSA problem in elastic optical networks

TL;DR

This paper presents the first exact integer linear programming formulation for the full RMSA problem in elastic optical networks, optimizing demand acceptance while minimizing resource usage.

Contribution

It introduces the first comprehensive ILP model for the full RMSA problem, addressing frequency-slot continuity and contiguity constraints.

Findings

The ILP formulation effectively solves RMSA in the NSFNET topology.

Exact solutions help optimize resource utilization in elastic optical networks.

Demonstrates the practicality of the approach for network planning.

Abstract

Exact solutions of the Routing, Modulation, and Spectrum Allocation (RMSA) problem in Elastic Optical Networks (EONs), so that the number of admitted demands is maximized while those of regenerators and frequency slots used are minimized, require a complex ILP formulation taking into account frequency-slot continuity and contiguity. We introduce the first such formulation, ending a hiatus of some years since the last ILP formulation for a much simpler RMSA variation was introduced. By exploiting a number of problem and solver specificities, we use the NSFNET topology to illustrate the practicality and importance of obtaining exact solutions.