无线网络虚拟化过程的植入算法研究

发布时间：2018-03-31 18:04

本文选题：物理设施　切入点：虚拟网络请求　出处：《南京邮电大学》2017年硕士论文

【摘要】：移动网络的运营目前正面临着持续增长的流量压力,而底层有限的物理资源正在变得日益紧张。无线网络虚拟化能够使多种无线网络共享相同的物理基础设施资源,是处理该问题的一种有效方式。其中一个主要挑战是如何高效可靠的根据所到达的虚拟网络请求对底层的物理网络资源进行合理的分配和利用。本文首先介绍网络虚拟化的理论知识和发展背景,在此基础上,本文研究提出一些针对虚拟网络映射的相关算法及策略。首先,本文给出了网络虚拟化相关的理论知识介绍,包括网络虚拟化的发展历史,现有研究中对于网络虚拟化相关的研究概况和一些实现方法,主要包括VN映射的典型问题描述和MILP模型,并详细的给出了两种相关的VN映射算法的实现过程。本文研究一种基于蚁群优化的虚拟网络映射算法。算法在节点映射阶段考虑负载与频谱连续性。在链路映射阶段则通过对节点可用性等级进行排序,从而降低了虚拟网络请求的阻塞率。仿真结果表明,该算法不仅可以降低阻塞概率和占用频率,而且还可以平衡链路负载。其次,本文提出一种尝试性的多媒体网络的映射策略,所针对的场景是面向多媒体服务的边缘云,对于无线通信环境复杂多变性,无线网络的带宽利用率会呈现出一定范围的波动和变化。最后的仿真结果表明在特定条件约束的多媒体资源场景下,所提出的网络映射策略方案基本符合预期的结果,从而为实际更复杂的应用场景提供一定的参考。
[Abstract]:The operation of mobile networks is currently under increasing traffic pressure, while the limited physical resources at the bottom are becoming increasingly tight. Wireless network virtualization enables multiple wireless networks to share the same physical infrastructure resources. It is an effective way to deal with this problem. One of the main challenges is how to allocate and utilize the underlying physical network resources efficiently and reliably according to the virtual network request. This paper first introduces the network. The theoretical knowledge and development background of network virtualization, On this basis, this paper puts forward some related algorithms and strategies for virtual network mapping. Firstly, this paper introduces the theory of network virtualization, including the history of network virtualization. The current research on network virtualization and some implementation methods include the typical problem description of VN mapping and MILP model. In this paper, we study a virtual network mapping algorithm based on ant colony optimization. The algorithm takes load and spectrum continuity into account in the node mapping phase. Phase sorts the node availability levels, The simulation results show that the proposed algorithm can not only reduce the blocking probability and occupancy frequency, but also balance the link load. In this paper, we propose a tentative mapping strategy for multimedia networks. The scenario is a multimedia service-oriented edge cloud, which is complex and volatile for wireless communication environments. The bandwidth utilization rate of wireless network will fluctuate and change in a certain range. Finally, the simulation results show that the proposed network mapping strategy scheme basically accords with the expected results in the scenario of multimedia resources with specific constraints. Thus, it provides a certain reference for the actual more complex application scenarios.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN92

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