Routing and Spectrum Assignment Algorithm based on Spectrum Fragment Assessment of Arriving Services

Elastic Optical Network (EON) is the promising solution for future optical networks. Spectrum fragments is one of the key issues in EON which will affect the allocation of subsequent services and the utilization of spectrum resource. This paper proposes an improved RSA algorithm for elastic optical network based on spectrum fragment assessment of arriving services. A new evaluation parameter called CSF (Consilience between Services and Fragments) is introduced. The proposed algorithm considers both the extent of current spectrum fragments and the differences of arriving services. Theoretical analysis and simulation result shows that the proposed scheme has better performance compared with the traditional shortest path routing strategy, and the maximal bandwidth blocking probability of the improved scheme can be reduced by 8.68%.