Migration From Fixed to Flexible Grid Optical Networks With Sub-Band Virtual Concatenation
Migration From Fixed to Flexible Grid Optical Networks With Sub-Band Virtual Concatenation
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DOI：
10.1109/jlt.2017.2685622
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发表时间：
2017-05
影响因子：
4.7
通讯作者：
Ya Zhang;Yao Zhang;S. Bose;G. Shen
中科院分区：
文献类型：
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作者：
Ya Zhang;Yao Zhang;S. Bose;G. Shen
提出了一种新的策略来操作混合的固定/灵活网格光网络，其可以用于从固定操作模式逐渐迁移到灵活操作模式。在固定网格和灵活网格共存的光网络中，采用多径子带虚级联（VCAT）或频谱分割（SS）技术进行路由和频谱分配（RSA）。提出了RSA优化问题的混合整数线性规划模型和一种基于谱窗平面的启发式算法。静态业务需求的结果表明，它是操作上更方便，使用多路径VCAT本身在混合网格光网络，以保证性能相媲美的联合多路径和单路径VCAT的情况下。网络性能也评估带宽阻塞概率（BBP）下的动态流量需求。仿真结果表明，多径VCAT方案可以有效地利用整体频谱资源，低阻塞。静态和动态流量需求的研究结果也证实，从纯固定网格光网络迁移到纯灵活网格对于更好的网络容量利用率将是可取的。
A novel strategy is presented to operate a mixed fixed/flexible grid optical network which may be used to gradually migrate from a fixed to a flexible mode of operation. Routing and spectrum allocation (RSA) in an optical network where fixed and flexible grids co-exist using a multi-path sub-band virtual concatenation (VCAT) or split spectrum (SS) technique is considered. Mixed integer linear programming models and an efficient heuristic algorithm based on spectrum window planes are proposed for the RSA optimization. The results obtained for the static traffic demand indicate that it is operationally more convenient to use the multi-path VCAT only by itself in a mixed grid optical network to guarantee performance comparable to that of the joint multi-path and single-path VCAT case. Network performance is also evaluated in terms of bandwidth blocking probability (BBP) under a dynamic traffic demand. Simulation results show that the multi-path VCAT scheme can efficiently utilize the overall spectrum resources with low blocking. The results of studies with both static and dynamic traffic demands also confirm that migration from a pure fixed grid optical network to a pure flexible grid will be desirable for better network capacity utilization.