针对多纤芯弹性光网络中业务的路径选择、纤芯选择和频谱分配问题进行了研究。建立了全局约束优化模型, 设计了基于纤芯轮换选择的启发式算法及其改进算法。在改进算法中, 根据不同的排序策略将业务排序; 然后根据业务的源宿结点以及所选取的路径将业务划分到不同的业务集合中, 在同一类业务集合中采用基于纤芯轮换的选择机制进行纤芯的选择; 在选中的纤芯上采用首次命中法进行频谱分配。在两个网络中进行了仿真以验证算法的性能, 仿真结果表明, 所设计的算法以及改进的算法能够得到比对比算法更优的路径选择与纤芯选择方案。

Routing, core selection and spectrum assignment in multi-core elastic optical networks are studied. A global constrained optimization model is established, and a heuristic algorithm and its improved algorithm based on core rotation selection are proposed. In the improved alginthm, connection requests are classified according to different sorting strategies. Connection requests are classified into different groups according to source node, destination node and the selected routing, the selection mechanism based on core rotation in the same connection request group is employed, and the first-fit method is used in spectrum assignment for the selected core. Simulations are conducted in two networks, and the results indicate that the proposed algorithm and its improved algorithm can obtain better scheme of routing and core selection than the compared algorithms.