Opaque virtual network mapping algorithms based on available spectrum adjacency for elastic optical networks

Optical network virtualization enables multiple virtual optical networks constructed for different infrastructure users (renters) or applications coexist over a physical infrastructure. Virtual optical network (VON) mapping algorithm is used to allocate necessary resources in the physical infrastructure to the VON requests (VRs). In this paper, we investigate the opaque VON mapping problems in elastic optical networks (EONs). Based on the concept of available spectrum adjacency (AvSA) on links or paths, we consider both node resource and AvSA on links for node mapping, and present a link mapping method which chooses the routing and spectrum plan whose AvSA on paths is the largest among all the candidates. Finally, the overall VON mapping algorithm (i.e., AvSA-opaque VON mapping, AvSA-OVONM) coordinated node and link mapping is proposed. Extensive simulations are conducted and the results show that AvSA-OVONM has better performance of blocking probability and revenue-to-cost ratio than current algorithms.