DRAMA-PRO+: disaster recovery algorithm with mitigation awareness for protected translucent elastic optical networks

Elasticoptical networks (EONs) have become promising solutions to meet the surging demand from 5G and cloud applications, offering high spectrum utilization through flexible resource assignment. In translucent EONs, spectrum efficiency is further enhanced by deploying regenerators. This high flexibility of EONs makes developing efficient survivability mechanisms a significant challenge, especially under large-scale failures. We consider multiclass traffic that includes a mix of protected and unprotected lightpaths (LPs) and allow lightpaths to be recovered with degraded service with an appropriate penalty by leveraging the concept of a mitigation zone introduced in previous work. A heuristic algorithm for disaster recovery with mitigation awareness for protected translucent EONs called DRAMA-PRO+ is proposed with the objective of minimizing the penalty. The algorithm integrates protection into the recovery process and incorporates regenerator utilization. Simulation results show that the proposed algorithm has significantly better performance in terms of both blocking ratio and penalty than baseline algorithms in the studied cases.