Dynamic routing, spectrum, and modulation-format allocation in mixed-grid optical networks
Dynamic routing, spectrum, and modulation-format allocation in mixed-grid optical networks
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DOI：
10.1364/jocn.378370
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发表时间：
2020-02
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通讯作者：
Tanjila Ahmed;Sabidur Rahman;Sifat Ferdousi;M. Tornatore;A. Mitra;Bijoy Chand Chatterjee;B. Mukherjee
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作者：
Tanjila Ahmed;Sabidur Rahman;Sifat Ferdousi;M. Tornatore;A. Mitra;Bijoy Chand Chatterjee;B. Mukherjee
随着基于云的服务的快速增长、5G通信的持续采用以及物联网（IoT）的爆发，光骨干网络中的流量在类型、数量和动态性方面正在迅速演变。弹性光网络（EON）通过采用灵活的网格，可以提供所需的容量和灵活性来应对这些快速变化。然而，运营商很少进行全新部署，因此为了限制前期投资，从固定网格到灵活网格交换设备的逐步迁移是更可取的。对于逐步迁移，可以升级交换节点（从网络瓶颈链路开始），同时保持传统固定网格网络的其余部分正常运行。我们将固定网格和灵活网格光设备的共存称为“混合网格”网络。由于固定网格节点和灵活网格节点之间的互操作性问题，弹性光网络中用于动态资源分配的传统算法在混合网格网络中无法有效应用。在这项研究中，我们提出了一种新的算法，称为混合网格感知动态资源分配，以在考虑互操作性约束的同时解决混合网格网络中的路由、频谱和调制格式分配问题。我们（在代表性网络拓扑上的）数值结果表明，与传统方法相比，所提出的方法在提供50%负载时阻塞减少了50%。
Traffic in optical backbone networks is evolving rapidly in terms of type, volume, and dynamicity following the rapid growth of cloud-based services, ongoing adoption of 5G communications, and explosion of the Internet of Things (IoT). The elastic optical network (EON), by adopting a flexible grid, can provide the required capacity and flexibility to handle these rapid changes. However, operators rarely perform greenfield deployments, so to limit upfront investment, a gradual migration from fixed-grid to flexible-grid switching equipment is preferable. For gradual migration, switching nodes can be upgraded (starting from bottleneck network links) while keeping the rest of the traditional fixed-grid network operational. We refer to the coexistence of fixed-grid and flex-grid optical equipment as a “mixed-grid” network. Traditional algorithms for dynamic resource assignment in EONs will not effectively be applicable in a mixed-grid network due to interoperability issues among fixed- and flex-grid nodes. In this study, we propose a new algorithm, called Mixed-grid-aware Dynamic Resource Allocation, to solve the route, spectrum, and modulation-format allocation problem in a mixed-grid network while considering interoperability constraints. Our numerical results (on representative network topologies) show that the proposed method achieves 50% less blocking (for 50% offered load) compared to the traditional approach.