基于频谱候选窗的弹性光网络频谱分配方案

Spectrum candidate window based spectrum assignment scheme for elastic optical network

弹性光网络(EON)中动态光路的建立与拆除容易产生频谱碎片,不合理的频谱分配策略会导致更高的带宽阻塞率。针对此问题提出了一种基于频谱候选窗(SCW)的EON改进频谱分配方案,对到达的业务寻找可用的SCW,按空闲频谱块连续度进行筛选以后再进行频谱分配。理论分析和数值仿真结果表明:相比于EF(Exact Fit)频谱分配策略,改进方案的带宽阻塞率性能最优可降低8.76%。

The dynamic establishment and tear-down optical paths in elastic optical networks will lead to spec- tral fragmentation. Since non-optimal spectrum allocation strategies may even result in higher bandwidth blocking rates, this paper proposes an improved spectrum allocation scheme for EON based on the spectnma candidate window （SCW）. The improved strategy will search available SCW for the arriving services, then filter them according to the degree of free spectrum blocks continuity. Theoretical analysis and numerical simu- lation result shows that SCW-SA strategy has better fragmentation performance and the maximal bandwidth blocking probability can be reduced by 8.76% compared with EF （Exact Fit） scheme.