Relative Cost Routing, Modulation and Spectrum Allocation in Elastic Optical Networks

This work extends the adaptive RSA algorithm that is based on the relative cost for solving the routing, modulation level and spectrum assignment (RMSA) for elastic optical network (EON). In planning and execution of EONs, RMSA is a viral aspect. Our proposed RMSA is rooted in the relative cost concept and evaluates the average effect upon the admission of a connection request at a given network state on a given set of resources. Besides, only if the minimal relative cost is less than the request's value, a connection request is admitted. Simulation has been used to display the effectiveness of using relative cost RMSA for attaining higher fairness in EONs and lower lost revenue.