IPv6环境下的端到端QoS模型

IP网络将向着IPv6的方向发展,提供可靠的网络服务并保证服务质量是未来IPv6网络需要解决的关键问题.介绍了IPv6的QoS功能,在分析比较综合服务(integrated services,IntServ)、区分服务(differentiated services,DiffServ)和多协议标签交换(multiprotocol label switching,MPLS)等服务质量模型的基础上,提出了一个基于IPv6的端到端QoS模型,探讨了模型的功能组成和工作过程,指出了进一步研究的方向.     

基于IPv6的多媒体通信策略

该文讨论了网络的IP化和IP网络综合化趋势,阐述了多媒体通信特性和IPv6基本特性,讨论了在IPv6网络上实现多媒体、特别是实时连续媒体的传输机制,分析了IPv6保证实时业务服务质量(QoS)的原理。     

移动IPv6环境下的QoS机制研究

移动IPv6为IPv6节点提供了在Internet不同子网中使用不变的家乡地址进行漫游通信的能力。相比于传统固定网络,节点的移动为通信的服务质量(QoS)保证提出了新的挑战。介绍了当前的移动IPv6技术和IP网的QoS技术,并针对移动IPv6的特点阐述了其QoS机制,对比各种机制的特点,对其进行网络时延的分析。最后说明了移动IPv6的QoS需要解决的问题。     

移动IPv6环境下的QoS机制研究

移动IPv6为IPv6节点提供了在Internet不同子网中使用不变的家乡地址进行漫游通信的能力。相比于传统固定网络，节点的移动为通信的服务质量（QoS）保证提出了新的挑战。介绍了当前的移动IPv6技术和IP网的QoS技术，并针对移动IPv6的特点阐述了其QoS机制，对比各种机制的特点，对其进行网络时延的分析。最后说明了移动IPv6的QoS需要解决的问题。     

浅析IPv6的QoS控制策略

随着IP网络上的新业务的不断出现,对IP网络的服务质量(QoS)提出了更高的要求,传统的IPv4没有带宽控制和流量控制功能,服务质量没有保证,新一代网络协议IPv6对其进行了较彻底的改进。本文简要介绍了IPv6的基本特征,详细讨论了在IPv6网络上保证服务质量(QoS)的原理及优缺点。     

一种IPv4/v6自适应的QoS VPN的设计和实现

提出了一种适应IPv4/v6混合组网的、具有QoS能力的VPN业务管理架构（IP4/6AQEVMA）,并从网络提供商（Network Provider,NP）的角度分析VPN用户的需求,分析基于IPv4和IPv6混合组网并支持多种QoS应用的VPN业务。因此,该架构重点强调两个方面：VPN业务提供对底层网络差异的屏蔽和灵活地为VPN用户提供具有多种QoS保证的VPN应用。     

基于集成服务的IP网络QoS实现技术

讨论了基于集成服务的IP网络中为实时业务预留资源的方法 ,利用RTP/RTCP实现实时业务传输的有效控制机制 ,以及利用IP数据分组头中的优先级及IPv6头中的流标记信息 ,为实时业务获得优先服务和快速转发的方法 ,实现实时业务在IP网络中传输的QoS。     

QoS技术浅谈

IP(IPv4)所提供的“尽力而为”服务,无法保证吞吐量和传送时延等服务质量(QoS)要求。本文介绍了IETF针对QoS的需求提出的集成服务(IntServ)/RSVP模型、区分服务(DiffServ)等服务模型和机制以及多协议标签交换(MPLS)和流量工程。     

IP服务质量的研究

IP服务质量已成为IP网络的研究热点,Internet面临的最大挑战之一是在IP网络中给不断涌现的各种应用提供区分的QoS性能保证。综述了IP服务质量的产生背景、当前的解决方案及相关的QoS技术支持。对当前IP QoS的两个主要模型进行了性能比较。     

基于IP/WDM网络的QoS技术研究

IP／WDM是目前网络发展的新动向。WDM技术增大了网络传输容量，为IP业务提供更加方便快捷的服务，但IP业务中的语音、视频、实时多媒体应用却对网络的服务质量QoS提出了更高的要求。介绍了IETF提出的几个QoS服务模型和机制，即集成服务(IntServ)／RSVP模型、区分服务(DiffServ)模型、多协议标签交换(MPLS)以及它们在IP／WDM网中的应用。     

Dynamic IP configuration of terminals in broadcasting networks

The concept of synergy between broadcasting and telecommunication networks has been strengthened by the emergence of multi-modal terminals, which are used in a broadcast environment (mainly in DTV-Digital Television networks) to provide IP-based multimedia services. The migration of IPv4/IPv6 applications, either interactive or not, in a broadcasting network, requires that certain parameters, such as Host, Gateway and DNS IP addresses are configured in the terminals, either statically or dynamically. This paper discusses issues of dynamic configuration of IP parameters for DTV terminals, based on an overview of relevant mechanisms usually used in access networks. It proposes an IP-based auto-configuration protocol tailored to the needs of an IP/DTV access platform, describes its implementation and evaluates its behaviour in a laboratory-based DVB-T network.     

Quality of Service Support in RPL Networks: Standing State and Future Prospects

The development of IP-based Internet of Things (IoT) networks would facilitate more effective end-to-end IP network architectures, but it remains a challenge. Network routing needs to be effectively addressed in the IoT environments of scarce computational and energy resources. Accordingly, the Internet Engineering Task Force (IETF) has specified the IPv6 Routing Protocol for Low Power and Lossy Network (RPL) to provide a bespoke IPv6-based routing framework for IoT networks. However, RPL comes with no Quality of Service (QoS) support which is an essential requirement for many IoT applications. The network research community has introduced a number of research proposals enhancing RPL with different QoS solutions. This paper presents a review of these proposed solutions and aims to establish a firm understanding of recent QoS developments for RPL and possible areas for future IoT routing research. The focus is on comprehending the protocol and networking properties that can affect QoS performance in RPL networks. Consideration is also given to different objective functions developed for addressing varying QoS aspects such as throughput, delay, and packet loss. RPL is also extended in a number of QoS solutions following different approaches at the MAC, network, and application layers. However, there is still a need for further developments to address effective QoS support, particularly for dynamic RPL networks.     

基于混合式分级流标签的IPv6组播通信

IPv6网络协议引入流标签概念,在路由器转发提供QoS支持。针对IPv6多媒体组播通信的需要,提出一种混合式流标签分级定义方案实现IPv6组播通信的QoS支持,在IPv6实验网上进行多媒体组播通信模拟测试,结果表明该方案能够提供满意的QoS支持。     

Next-generation corporate networks

The Internet Protocol will bring together two disparate networks now vital to every business: the PSTN (Public Switched Telephone Network) and the Internet. Next generation enterprise networks (NGENs) must fulfill current expectations for corporate networks, plus also seamlessly support mobility and multimedia applications. And they must do this within flexible, often adaptive, self-configuring, and interoperable architectures. NGENs also must be user-friendly and scalable. They must support bandwidth and quality-of-service (QoS) requirements, in addition to delivering the expected reliability and availability. To meet these requirements, the trend is to consolidate disparate networks into one simple (IP only) high-capacity, reliable, scalable, QoS-aware network. NGENs will use one set of protocols (such as IPv4 or IPv6), processes, and vendors and one set of management, administration, and billing processes. They must be able to easily accommodate emerging technologies and services     

Modeling and performance analysis for IPv6 traffic with multiple QoS classes

This paper focuses on the modeling and performance analysis for IPv6 traffic with multi-class QoS in virtual private networks (VPN). The multi-class QoS is implemented on differentiated service basis using priority scheme of 4 bits defined in the packet header of IPv6. A VPN-enabled IP router is modeled as a tandem queuing system in which each output link consists of two parallel priority output queues. The high-priority queue is used to carry the delay sensitive traffic while the low-priority queue is used to carry the delay insensitive traffic. On the other hand, multiple thresholds are implemented in each queue, respectively, for packet loss priority control. The performance analysis is done using fluid flow techniques. The numerical results obtained from the analysis show that the differentiated service based on the priority schemes defined in IPv6 is able to effectively satisfy the multi-class QoS requirement for supporting multimedia services in VPN. The performance trade-off between the delay sensitive traffic and delay insensitive traffic in terms of traffic throughput, packet loss probability and end-to-end delay in VPN networks is presented.     

Definition and Performance Evaluation of Network Services Deployed Over a Differentiated Services Network

A vital requirement for next generation IP networks is the provision of services with differentiated behavior and characteristics. The basic reason for that is the need to provide Quality of Service (QoS) to the different types of user traffic produced by applications that are different in nature and behavior, analogously to the IP network services. The Differentiated Services (DiffServ) paradigm is still one of the major outcomes of the research community toward the provision of QoS to individual customer needs and applications. This paper addresses the definition and deployment of specific network services in a DiffServ environment. We reuse and extend the fundamental concepts of the Expedited Forwarding and Assured Forwarding per hop behaviors in order to define four new network services, apart from the well known Best Effort one, which introduce a specific traffic handling implementation along with an Admission Control methodology. These are analyzed and simulated in the paper in order to evaluate their performance and confirm the correctness of their fundamental principles.