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弹性光网络可大幅度提高频谱利用率并为用户提供灵活的带宽粒度.为改进已有弹性光网络的选路与频谱分配算法,建立了描述弹性光网络中选路与频谱分配问题的整数线性规划模型,提出两种分别基于最多频隙数优先和最长路径优先与业务疏导结合的启发式算法,以进一步提高频谱利用率,设计了所提算法的重排序准则和流程.对小型6结点、中型14结点和大型19结点等三种不同网络拓扑进行仿真实验,结果表明,所提算法可有效提高已有算法的频谱利用率.
Elastic optical network can greatly improve the spectrum utilization and provide users with flexible bandwidth granularity.In order to improve the routing and spectrum allocation algorithms of existing flexible optical networks, an integer linear programming model is proposed to describe the routing and spectrum allocation in elastic optical networks Model, we propose two heuristic algorithms based on the combination of the maximum number of slots priority and the longest path priority with the service grooming to further improve the spectrum utilization rate, and design the reordering rules and procedures of the proposed algorithm.A small 6-node , Medium-sized 14-node and large-scale 19-node. The results show that the proposed algorithm can effectively improve the spectral efficiency of the existing algorithms.