灵活栅格光网络中可虚拟化光收发器资源提供机制及性能研究

In order to serve the future high-performance Internet applications, optical network virtualization has become a new and hot research area during the past several years. This technology is proposed to offer each application type a dedicated virtual optical network (VON). Virtualizeable bandwidth variable transceiver (V-BVT) is an essential enabler to create multiple VONs. Previous research works mainly focus more on physical realization technologies to perform bandwidth-variability or sliceability of an optical transceiver. Although these technologies bring the resource flexibility of the transceiver to a certain extent, the functionalities required to support network virtualization are missing and their physical resources are not utilized cost-effectively. In this proposal, we first design a mechanism to create a virtual transceiver, by using the slicing or aggregation of the transceiver resources. The proposed mechanism effectively improves the transceiver resource utilization, and greatly decreases the size and cost of the transceiver resource, while it has good scalability. Then, based on this mechanism, we study the multi-dimensional resource provisioning scheme in flexible-grid optical networks, with a special focus on the defragmentation issue and the dynamical provisioning capacity of cross-layer resources. This proposal will build a three-node optical switching system platform to verify and demonstrate the proposed key techniques and principles. This research may be viewed as a generalization of existing research. The applicant and his team have solid background in this topic. Based on the previous research works, the results investigated and developed in this proposal, will improve the traffic's performance, increase the network optical-layer resource utilization, enhance resource cost-effectiveness and finally promote the development and research of the next-generation flexible-grid optical networks.

为了服务于未来高性能互联网应用，光网络虚拟化技术是近年来研究的一个热点，该技术可以为每一种应用类型提供专属的虚拟光网络平台。可虚拟化光收发器是创建虚拟光网络平台必不可少的关键技术。已有的研究侧重于带宽可变或可切片光收发器的物理实现，虽然一定程度上发挥了收发器资源的灵活性，但没有涉及到虚拟化功能，资源没有得到高效的利用。本项目首先提出一种可虚拟化光收发器的资源提供机制，有效提高收发器资源利用率，大大降低了收发器资源规模和成本，具有良好的可扩展性。然后以这种机制为基础，从实现原理、调度机制、虚拟化方法和去碎片化机制等方面进行系统深入的研究，并利用光交换实验平台，对关键技术进行验证。本项目以灵活栅格光网络为基础，用全新而实际的视角审视光网络中端到端多维资源提供问题，极大地拓展了这个问题的内涵和外延，具有很强的理论价值，同时也将有力推动下一代光网络技术在新兴互联网应用领域的发展。

为了服务于未来高性能互联网应用，光网络虚拟化技术是近年来研究的一个热点，该技术可以为每一种应用类型提供专属的虚拟光网络平台。可虚拟化光收发器是创建虚拟光网络平台必不可少的关键技术。已有的研究侧重于带宽可变或可切片光收发器的物理实现，虽然一定程度上发挥了收发器资源的灵活性，但没有涉及到虚拟化功能，资源没有得到高效的利用。本项目以灵活栅格光网络为基础，用全新而实际的视角审视光网络中端到端多维资源提供问题，有力推动下一代光网络技术在新兴互联网应用领域的发展。.首先，提出了一种ROADM节点内部收发器库和收发器的最优配置方案，给出了最佳配置的规模，节省了节点内部收发机资源，还提高了网络链路带宽利用率。.其次，设计了一种意识到去碎片化的虚拟光网络映射方案，给出了适用于多个网络虚拟化请求的ILP模型，设计了一种意识到网络光谱碎片化程度的权重计算方法，有效地减低了网络光谱碎片化程度，提高网络光谱利用率，提升了光网络性能和服务质量。.再次，提出了一种基于光收发器和数据中心节能模型的虚拟光网络映射方案，建立了相应的整数线性规划模型，利用光收发器和数据中心的能耗模型，设计了能量有效利用的映射算法，有效地降低网络能耗和提高网络资源利用率。.最后，提出了一种集成式虚拟光网络映射方案，考虑到节点映射和链路映射之间的相互影响、子载波资源、调制器数量及传输距离的影响等，该机制能够有效降低网络业务堵塞率，提高网络收益。

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