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Network virtualization on the wireless edge.

机译：无线边缘的网络虚拟化。

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摘要

This thesis presents a comprehensive investigation of wireless network virtualization, a technique for creating multiple independent software-definable networks on a single set of commercial hardware resources. Network virtualization has previously been applied to wired networking scenarios, but the general problems of wireless virtualization represents an important open problem that we address in this work. In particular, we identify key technical challenges, system concepts and architectures, as well as specific protocols and algorithms for implementing wireless network virtualization. In summary, this thesis will provide results for following aspects of wireless network virtualization: (1) Basic mechanisms for link (spectrum) sharing and their isolation performance with virtual WLAN networks, (2) Virtualization mechanisms and traffic isolation algorithms for virtualized WiFi networks, (3) Virtualization of cellular basestations including experimental evaluation for a prototype 4G/WiMAX network, and finally, (4) analytical evaluation of virtualization algorithms for more general multi-hop wireless topologies.;The first part of the thesis presents an exploratory discussion on the co-existence of multiple 802.11 based virtual networks. A comparison is presented for understanding the tradeoffs between sharing the radio through spatial and temporal separation on the ORBIT wireless testbed. Experimental evaluations reveal that while virtual networks sharing channel resources by space separation achieve better efficiency than those relying on time, the isolation between experiments in both cases is comparable.;Supporting virtualized WiFi access point based networks allows for a convenient sharing of a physical access point across multiple ISPs or network operators. The second part of the thesis discusses our SplitAP architecture, which builds on the virtual access point (VAP) mechanism by extending it to support fair-sharing of airtime across multiple wireless networks. This is done by implementing a dynamically controlled isolation framework across competing slices. The framework also allows the user to deploy custom algorithms for enforcing uplink airtime fairness across client groups within the SplitAP framework. The thesis shows up to 40% improvement in isolation measured through a modified Jain fairness index with LPFC and LPFC+, two sample algorithms implemented on the framework.;The third part of the thesis addresses the challenge of virtualization of resources in a cellular basestation (BTS) while allowing operators to use distinct flow types, quota allocations, slice schedulers, and network layer protocols. The proposed virtual basestation architecture is based on an external substrate which uses a layer-2 switched datapath, and an arbitrated control path to the WiMAX base station. The virtual network traffic shaping (VNTS) slice isolation mechanism allows the virtual basestation users to obtain at least an allocated percentage of the BTS resources in the presence of saturation and link degradation, helping make the performance repeatable. Performance measures such as fairness index and coupling coefficient are defined and evaluated experimentally, showing significant improvements with preliminary indoor mobility experiments. Outdoor vehicular measurements show similar improvements in the fairness index and coupling coefficient, demonstrating the feasibility of the proposed VNTS algorithms.;Finally, a theoretical formulation describes how a mapping mechanism can be used for provisioning and allocating resources on wireless networks that are supported by wireless virtualization schemes such as the virtual basestation and the SplitAP framework. Results show that the wireless mapping problem can be reduced to solving a combinatorial optimization problem at nodes selected greedily based on their capabilities to generate revenue. Detailed simulations are discussed for highlighting the performance of the proposed greedy static allocation (GSA) and greedy dynamic re-allocation (GDR) algorithms.
机译：本文对无线网络虚拟化进行了全面的研究，无线网络虚拟化是一种用于在一组商用硬件资源上创建多个独立的软件定义网络的技术。网络虚拟化以前已应用于有线网络方案，但是无线虚拟化的普遍问题代表了我们在这项工作中要解决的重要开放问题。特别是，我们确定了关键技术挑战，系统概念和体系结构，以及实现无线网络虚拟化的特定协议和算法。总而言之，本论文将为无线网络虚拟化的以下几个方面提供结果：（1）虚拟WLAN网络进行链路（频谱）共享的基本机制及其隔离性能；（2）虚拟化WiFi网络的虚拟化机制和流量隔离算法， （3）蜂窝基站的虚拟化，包括对4G / WiMAX原型网络的实验评估，最后，（4）对更通用的多跳无线拓扑进行虚拟化算法的分析评估。多个基于802.11的虚拟网络的共存。进行比较是为了了解在ORBIT无线测试台上通过空间和时间间隔共享无线电之间的权衡。实验评估表明，尽管通过空间分隔共享信道资源的虚拟网络比依赖时间的虚拟网络具有更高的效率，但两种情况下的实验隔离是可比的。支持基于虚拟WiFi接入点的网络可以方便地共享物理接入点跨多个ISP或网络运营商。本文的第二部分讨论了我们的SplitAP体系结构，该体系结构通过扩展虚拟访问点（VAP）机制而建立，以支持跨多个无线网络公平地共享通话时间。这是通过跨竞争片实施动态控制的隔离框架来完成的。该框架还允许用户部署自定义算法，以在SplitAP框架内跨客户端组实施上行链路通话时间公平性。本文展示了通过在框架上实现的两个示例算法，通过使用LPFC和LPFC +修改的Jain公平指数测量的隔离度提高了40％。本文的第三部分解决了蜂窝基站（BTS）中资源虚拟化的挑战），同时允许运营商使用不同的流类型，配额分配，分片调度程序和网络层协议。所提出的虚拟基站架构基于使用第二层交换数据路径和至WiMAX基站的仲裁控制路径的外部基板。虚拟网络流量整形（VNTS）切片隔离机制允许虚拟基站用户在存在饱和和链路降级的情况下获得至少一定比例的BTS资源，以帮助提高性能。实验性定义和评估了诸如公平指数和耦合系数之类的性能指标，显示出初步室内流动性实验的显着改进。室外车辆测量显示出公平性指标和耦合系数的类似改进，证明了所提出的VNTS算法的可行性。最后，一种理论公式描述了如何使用映射机制在无线支持的无线网络上提供和分配资源虚拟化方案，例如虚拟基站和SplitAP框架。结果表明，无线映射问题可以简化为基于贪婪选择的节点产生收入的能力来解决组合优化问题。讨论了详细的仿真，以突出显示所提出的贪婪静态分配（GSA）和贪婪动态重新分配（GDR）算法的性能。

著录项

  • 作者

    Bhanage, Gautam Dilip.;

  • 作者单位

    Rutgers The State University of New Jersey - New Brunswick.;

  • 授予单位 Rutgers The State University of New Jersey - New Brunswick.;
  • 学科 Engineering Computer.;Computer Science.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 159 p.
  • 总页数 159
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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