Routing and Spectrum Assignment for Software-Defined Elastic Optical Networks
Software-defined Elastic Optical Networks (SD-EONs) combine software-defined network (SDN) with elastic optical networks (EONs) to further improve the spectrum utilization of routing and spectrum assignment (RSA) algorithms. However, some existing RSA algorithms usually only consider the hops when solving route subproblem, whereas the link spectrum status is also very important. At the same time, they usually neglect the vertical fragmentation between neighbor links during the spectrum assignment. Therefore, we propose an innovative hop and consecutiveness-based routing and fragmentation-aware spectrum assignment (HCR-FSA) algorithm with a joint consideration of hops and spectrum consecutiveness in routing selection and pays attention to both horizontal and vertical fragmentations during spectrum assignment. We implement our HCR-RSA algorithm in RYU controller to evaluate its performance. The experimental results show that our algorithm achieves better blocking probability and fragment degree compared with the previous works.
KeywordsElastic optical networks (EONs) Software-defined network (SDN) Routing and spectrum assignment (RSA) Horizontal fragmentation Vertical fragmentation
This work was supported in part by the National Natural Science Foundation of China under Grant 61371091, the “13th five-year” Key Research Project of DMU under Grant 3132016318, and the Fundamental Research Funds for Central Universities under Grant 3132017078.
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