A Serial Optimization and Link-oriented Based Routing Approach for RMLSA in Elastic Optical Networks

Abstract

This work presents a study of the impact of random load, maintaining the number of paths K constant, on the spectrum used, and also the behavior of joint and serialized optimization approaches, in the Routing, Modulation Level and Spectrum Assignment (RMLSA) problem in Elastic Optical Networks (EON). In this context, four integer linear programming (ILP) models are implemented under the considerations of joint/serial optimization approach and path/link oriented routing. To achieve the above, an ILP model with a focus on serial optimization (RML+SA) and link-oriented routing is a proposal of the present work. Considering heterogeneous traffic load, in general, path-oriented routing approaches tend to the solution generated by link-oriented routing approaches; however, these latter approaches needs a longer computation time to achieve substantial improvements when is considered a join optimization approach, which makes the path-oriented routing and serial optimization approaches more attractive when the problem becomes more complex.