Distributed Sub-Tree-Based Optical Multicasting Scheme in Elastic Optical Data Center Networks
Distributed Sub-Tree-Based Optical Multicasting Scheme in Elastic Optical Data Center Networks
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DOI：
10.1109/access.2018.2799867
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Xin Li;Lu Zhang;Ying Tang;Junfeng Guo;Shanguo Huang
中科院分区：
文献类型：
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作者：
Xin Li;Lu Zhang;Ying Tang;Junfeng Guo;Shanguo Huang
基于子树的光多播方案提供了一种频谱高效的方法来提供新兴的多播服务在光数据中心网络。此外，多播服务通常在多个地理分布的数据中心中复制和维护，以提高其访问效率和可靠性。因此，用于多播需求的所有构造的子树的源数据中心不限于公共数据中心，并且可以由所请求的分布独立地确定。在本文中，我们研究的问题，同时利用多个地理分布的数据中心之间的组播服务备份的组播服务提供。提出了一种新的基于分布式子树的光多播（DST-OM）方案。以弹性光数据中心网络中所有组播需求的总频谱消耗最小为目标，建立了DST-OM方案的整数线性规划模型。我们还定义了最小谱子树（MSST）的问题的DST-OM计划。两个调制水平感知的启发式算法来解决MSST问题。数值结果表明，与传统的基于共源子树的光多播方案和基于单树的光多播方案相比，DST-OM方案具有更高的频谱效率和更低的阻塞概率。
The sub-tree-based optical multicasting scheme provides a spectrum-efficient approach to providing emerging multicast services in optical data center networks. Moreover, multicast services are usually replicated and maintained in multiple geographically distributed data centers to improve its access efficiency and reliability. Therefore, the source data centers of all constructed sub-trees for a multicast demand are not confined to a common data center and can be independently determined by the requested distribution. In this paper, we study the problem of multicast service provisions while leveraging multicast service backups among multiple geographically distributed data centers. A novel distributed sub-tree-based optical multicasting (DST-OM) scheme is proposed. An integer linear program model is developed for the DST-OM scheme with the aim of minimizing the total spectrum consumption of all multicast demands in elastic optical data center networks. We also define the minimum spectrum sub-tree (MSST) problem for the DST-OM scheme. Two modulation-level-aware heuristic algorithms are developed to address the MSST problem. Numerical results show that the DST-OM scheme achieves higher spectrum efficiency and lower blocking probability than the conventional common source sub-tree-based optical multicasting scheme and the single-tree-based optical multicasting scheme.