A precise partition strategy for proactive fragmentation avoidance in SDM-EONs with crosstalk awareness

Nowadays, space-division-multiplexing elastic optical networks (SDM-EONs) have become a promising technology for the next generation of backbone networks. Routing, spectrum and core assignment (RSCA) problem is one of the key issues in SDM-EONs. However, spectrum fragmentation and inter-core crosstalk are two main disadvantages which would impact performance of RSCA algorithm. In this paper, we investigate proactive fragmentation avoidance method in SDM-EONs with crosstalk awareness. We first propose a precise partition strategy to preassign spectrum resources to different types of services and introduce a crosstalk awareness method to effectively and conveniently measure crosstalk suffered by frequency slices; then we design a precise-partition-based spectrum assignment algorithm to allocate spectrum resources to connection requests under both crosstalk-ignoring and -considering cases. Simulation results show that the proposed algorithm outperforms the existing proactive fragmentation avoidance algorithms in terms of blocking probability.