基于不相交连接组优化的EON频谱分配方案

Spectrum allocation scheme for EON based on optimal disjoint connection group

弹性光网络(EON)中业务频谱分配需要同时满足子载波频谱连续性约束和链路一致性约束,当剩余可用频隙不满足约束条件时,易导致请求业务阻塞。提出了一种基于不相交连接组优化的频谱分配方案,对到达的业务按照带宽需求和路由长度分配不相交连接组和相交连接组,分别采用对应分配策略以获得更多连续可用频隙,避免产生频谱碎片。理论分析和仿真结果显示:在100～600Erl内,相比传统分配策略,改进方案获得的连续可用频隙比改善了约8.6%～12.7%;在网络负载为600Erl时,相比First Fit和First-Last Fit方案,改进方案的带宽阻塞率分别改善约13.8%和6.8%。

The service spectrum allocation in elastic optical network （EON） should satisfy both the subcarrier slots and link consistency constraints simultaneously, thus service requirements maybe blocked due to the re- maining available frequency slots do not satisfy the constraint. This paper proposes a spectrum allocation scheme based on optimal disjoint connection group for elastic optical networks. Then separation of the dis- joint and non-disjoint connections based on traffic demands and routing lengths are implemented with corre- sponding policy, which will provide a higher number of contiguous aligned available slots and reduce band- width fragmentation. Theoretical analysis and simulation results show that the proposed scheme has better contiguous aligned available slot ratio as 8.6%-12.7% compared with traditional scheme in 100-600Erl. When the network load is 600Erl, the improvement of the bandwidth blocking ratio are about 13.8% and 6.8% compare to FF and FL schemes, respectively.