利用主动网络技术实现VPN

主动网络是一种新型的网络体系结构，它允许用户或应用向报文内嵌入主动代码来定制网络服务。介绍了一种利用主动网络技术实现VPN(Virtual Private Network，虚拟专用网)的实验方案，并提出了以模块化的方式建立和动态配置VPN的具体模型。     

主动网络技术研究

主动网络提出了一种允许配置更为高级的网络服务的新型通信体系结构，在主动网络中，经过其路由结点上运行由用户定制的服务代码，改变了传统网络只能在端系统执行服务运算的特点。利用主动网络提供的编程环境，我们更易于优化和扩展现有的协议，开发新的协议。本描述了主动网络的体系结构框架以及两种主要实现方式，回顾并比较了现今巳提出的几种主动网络的实验性设计实现。     

主动网络技术在电力市场中的应用

在研究电力市场和主动网络技术的基础上，指出将主动网络技术应用于电力市场可以为其提供一种高效、灵活的通信机制：进而分析了电力交易和电力通信网的特点，并提出了基于主动网络技术的电力交易模型和电力通信网网络管理模型，这种新模型可以较好地解决传统模型存在的问题。     

论网络管理中的主动网络技术

在网络管理中,网络技术的应用是十分重要的,能够为网络服务质量控制提供有力的支持。基于TCP/IP协议的网络管理技术是一种基于客户/服务器的集中管理体系结构,随着网络规模的扩大,出现了通信瓶颈、带宽浪费、缺乏实现性和主动性的缺点。本文主要介绍了网络管理中新的主动网络技术。     

基于移动代理的应用层主动网络框架研究

将移动agent技术和主动网络思想融入下一代网络体系结构的研究中，提出了基于移动Agent的应用层主动网络的概念和框架模型。该模型主要从两个方面利用移动代理技术：一是主动包的封装；二是构造可迁移的移动代理环境MAE。并提供了对主动节点和网络服务动态定制的能力。     

主动网络技术研究

主动网络提出了一种允许配置更为高级的网络服务的新型通信体系结构,在主动网络中,经过其路由结点的分组可以在这些结点上运行由用户定制的服务代码,改变了传统网络只能在端系统执行服务运算的特点。利用主动网络提供的编程环境,我们更易于优化和扩展现有的协议,开发新的协议。本文描述了主动网络的体系结构框架以及两种主要实现方式,回顾并比较了现今已提出的几种主动网络的实验性设计实现。     

基于主动网络的多约束路由探测算法

本文提出了一种基于主动网络的多约束路由探测算法MAR(Multi-constrained Active Routing).与传统路由算法相比,MAR不仅能灵活地提供多种约束条件的服务质量保证,而且充分发挥了主动网络的可编程和自定制能力,允许用户根据业务要求和网络状况自定制约束条件和相关参数.通过仿真MAR算法在各种网络条件下的性能表明,MAR算法能够提高多约束条件寻路的成功率.     

主动网络技术下分布应用的性能优化

本文独立地提出了基于插件技术的主动网络的体系结构,通过插件技术使业务的引入以及业务功能的扩展更加快速、灵活,在此基础上建立了一种新的网上定票业务模型,仿真表明,主动网络在网络中加入计算的能力可以大大优化网络的性能,网络在对用户的平均响应时间、服务器负载等方面都明显有所改善。     

网络功能虚拟化网络功能虚拟化:基于虚拟化的中间件盒子

基于虚拟化的中间件盒子的模型,采用x86架构的电脑硬件设备,依托虚拟化平台构建了一种集成了路由器、语音服务器、虚拟桌面等服务的虚拟中间件盒子。该虚拟中间件盒子采用了中间件盒子的概念,即在标准的服务器上运行开源的虚拟化平台,如XEN、KVM等,并运用网络功能虚拟化(NFV)的理念和软件定义网络(SDN)的理念进行控制管理,最终实现为每个组织、企业、个人提供虚拟通信网络服务(网络功能虚拟化)和虚拟运营服务。     

Protection Management for Guaranteed User‐Driven Virtual Circuit Services in Dynamic Multi‐domain Environments: Design Issues and Challenges

Fault management of virtualized network environments using user‐driven network provisioning systems (NPSs) is crucial for guaranteeing seamless virtual network services irrespective of physical infrastructure impairment. The network service interface (NSI) of the Open Grid Forum reflects the need for a common standard management API for the reservation and provisioning of user‐driven virtual circuits (VCs) across global networks. NSI‐based NPSs (that is, network service agents) can be used to compose user‐driven VCs for mission‐critical applications in a dynamic multi‐domain. In this article, we first attempt to outline the design issues and challenges faced when attempting to provide mission‐critical applications using dynamic VCs with a protection that is both user‐driven and trustworthy in a dynamic multi‐domain environment, to motivate work in this area of research. We also survey representative works that address inter‐domain VC protection and qualitatively evaluate them and current NSI against the issues and challenges.     

一种基于模糊逻辑的虚拟服务迁移策略

在网络虚拟化环境中,用户对虚拟网络的需求不是一成不变的,而是受到用户行为、位置、移动性等多方面因素的影响。针对用户需求变化的应用场景,为了实现绿色节能、低能耗、高效利用的虚拟资源迁移与调度,提出了基于模糊逻辑推理的虚拟服务迁移机制。该机制能够有效地对用户需求的变化进行判断,根据用户需求的变化情况,对虚拟服务进行迁移,既提高了资源利用率,也提升了用户的服务体验。     

基于用户访问感知的家宽业务质差识别研究与实践

随着互联网的迅猛发展,用户对业务感知和服务质量要求越来越高,网络业务质量 监测也变得日益重要。分析了当前家宽业务质差识别现状,提出了一种基于用户访问感知指标的宽带业务体验评分方法,并通过区域试点验证了评价体系的有效 性。使用该方法可有效提升质差用户识别率,对于网络问题的主动发现、网络质量的精细化管理具有较好的参考意义。     

Resource allocation mechanism in the TWDM-PON and C-RAN joint architecture with hybrid energy supply

Aiming at the problems of low resource utilization rate,high energy consumption and poor user service quality in the existing virtualized Cloud Radio Access Network,an energy-aware virtualized resource allocation mechanism with hybrid energy supply was proposed.According to the energy sources and energy consumption of different network devices,energy arrival and energy consumption models were established.Furthermore,under the premise of guaranteeing the quality of user services,considering proportional fairness and energy consumption optimization,distributed algorithms based on asynchronous update were used to allocate resources and harvested energy for different types of virtual cloud radio access networks and user virtual base stations to effectively improve the energy efficiency of network.The simulation results show that the proposed resource allocation mechanism can reduce energy consumption while effectively reducing the latency and improving the throughput.     

下一代网络的动态用户交互环境及其移动性研究

随着宽带多媒体业务的发展，下一代网络中用户和网络及业务的交互环境即将成为一个重要的研究课题。通过研究目前网络的人机交互发展趋势．本文首先提出了动态用户交互环境及其移动性的概念，通过对用户交互环境的业务分析，对在下一代网络中实现这种环境的结构和技术进行初步的探讨。     

一种基于虚拟社交化的Web服务发现方法研究

提出一种基于虚拟社交化的Web服务发现方法,从相互竞争和相互协作的服务关系中寻找满足用户需求的服务。首先在竞争关系中,通过计算服务之间的文本相似度和结构相似度,选择出一组竞争力强的服务列表,然后根据协作关系,通过计算列表中各服务的交际能力,把交际能力强的服务推荐给用户,实现用户的组合服务流程。通过与其他方法在召回率和准确率方面的比较,验证了本方法的有效性。     

基于SDN/NFV的未来网络实验平台

依据SDN/NFV集中管控、动态、灵活、高效、可编排等特点,提出了基于SDN/NFV技术的未来网络实验平台的构建方案.该平台主要采用OpenStack和OpenDaylight的开源架构,同时研发设计SDN跨域虚拟网络通信、虚拟网元管理以及网络服务编排三大关键技术,实现了底层异构资源的实时动态管理与开放共享.同时,根据实验用户对网络资源的需求,灵活按需编排各种网络资源与SFC服务,为用户提供端到端的网络实验验证服务.     

面向SDN的动态网络策略部署与实现

软件定义网络（SDN）为未来网络业务的管理要求提供了一种新的解决方案。以动态服务功能链作为服务功能编排模式、以高级网络编程语言作为服务功能部署工具,并结合虚拟网络映射设计了业务到策略、从控制器到网络节点的部署方案。基于SDN三层结构,提出动态策略管理系统。动态策略管理系统可以根据反馈的网络状态信息调整网络策略,并对同一节点上的网络策略进行冲突检测,根据不同的冲突类型选择组合方式,有效避免了网络策略冲突,实现网络服务的自适应部署。最后,通过实验验证了动态策略管理系统从业务到策略的完整部署过程。     

Service convergence using MPLS multiservice networks

Enterprises are increasingly using virtual private networks to interconnect remote sites. Traditionally, service providers have used ATM core networks to deliver layer 2 services such as frame relay, ATM, or TDM private lines, which enterprise customers have then used to build their corporate network infrastructure. Such services account for the majority of data service revenues today. However, pressure has increased on service providers to combine increased flexibility with reduced costs in the context of a highly dynamic telecommunications market. Service providers also need to generate new revenues from their IP network infrastructure, through new opportunities such as IP VPNs and virtual private LAN services, while simultaneously achieving operational efficiencies through the convergence of all of their services on a common MPLS backbone. New access and metro network technologies, such as Ethernet, are also emerging that can be used to deliver these new services to enterprise customers alongside ATM and frame relay access. This must be achieved while also supporting existing technologies such as ATM, which continue to deliver highly profitable services. This article discusses the technical challenges in meeting the often conflicting requirements of delivering both traditional layer 2 services and new layer 3 services on a converged MPLS network. We show how both network and service interworking are required, and how these must operate at the user, control, and management planes to enable profitable services to be delivered over the new converged network. The different solutions being defined in the standards bodies are described, and the distinct scenarios they address are explained.     

A mobile virtual-distributed system architecture for supporting wireless mobile computing and communications

This paper describes a novel mobile virtual-distrubuted system architecture for supporting global mobile computing and communications. the principal contribution of this paper is to innovatively apply virtual memory concepts to mobile systems by deploying mobile-floating agents to de-couple services and resources from the underlying network and allow them to move around following their mobile users. The mobile-floating agents maintain data structures associated with a mobile user. By combining the mobile-floating agent functions with a predictive mobility management algorithm and location-aware caching and prefetching, services and user data structure are pre-connected and pre-assigned at the locations to which the user is moving. Thus, the users can maintain their data structures or immediately receive service with virtually the same efficiency as at the previous location.