端到端QoS的实现研究

对IP网的QoS研究导致了两种不同的QoS体系结构的出现：综合服务模型和区分服务模型。本文简单地介绍了这两种服务模型，分析了他们之间的优缺点和差异，详细讨论了如何从实际使用的角度结合两者的优势实现端到端QoS的方案。     

基于Intserv和Diffserv的端到端QoS研究

本文首先介绍了集成服务模型(Intserv)和区分服务模型(Diffserv)的原理及特点，以及MPLS技术同这两种模型的结合方法。并针对集成服务模型和区分服务模型各自的优缺点，提出了对两者相结合的端到端QoS。最后对QoS的现状进行了分析，展望了其今后的发展趋势。     

IPv6部署对移动网络QoS影响分析

随着物联网的兴起和移动数据业务的增长,在移动网络中引入IPv6成为大势所趋。首先介绍了移动网络中Qos的架构,其次从终端、无线接入侧、核心网和外部承载网等方面对移动网络引入IPv6后给QoS所带来的影响进行了分析,提出了移动网络在向IPv6演进的过程中保障QoS需要注意的问题及方案,为在移动网络中引入IPv6提供了参考。     

一种改进的异构网络业务流识别和映射方法

为了提高异构网络中多媒体业务服务质量(Quality of Service,QoS)保证能力,提出一种异构网络多媒体业务流识别和映射方法 (QoS Mapping and Identification Method Based on Traffic Flow,QMIM-TF)。考虑了未明确标注QoS类别的多媒体业务的映射问题;通过感知网络环境,灵活调整QoS类映射结果,提高网络端到端系统效能,提供有效的异构网络端到端QoS保证;基于现行网络设备获取QoS属性,进行业务区分,使方案具有较好的通用性和可实现性;将在线与离线识别相结合,兼顾网络实时性和准确性要求。通过仿真验证了方案的有效性。     

中兴通讯助力打造上海世博IPv6园区网

随着Internet规模急剧膨胀,IP地址需求量呈现爆发性增长,目前IPv4地址仅剩余不到总量的7%,按照目前的消耗速度,2012年左右IPv4地址将耗尽。而物联网与移动互联网的兴起,必将消耗更多的地址并加快IPv4地址的耗尽。除地址危机外,IPv4协议还存在网络安全、移动IP,QoS等实现机制不完善的缺陷,不能满足新业务电信级需求,无法适应网络融合趋势,IPv4逐渐成为Internet进一步发展的障碍。IPv6充分迎合了未来网络向IP融合的发展方向,并且进一步完善了IP网络的可运营可管理性,具有地址充足、报头高效、即插即用、网络安全、端到端QoS以及良好的移动性等特点。中兴通讯股份有限公司牛启波所撰《中兴通讯助力打造上海世博IPv6园区网》介绍了作为2010年世博会全球合作伙伴,中国电信首次在国内采用IPv6承建世博园区承载网,为上海世博会提供宽带接入、高清IPTV和视频监控等IPv6应用。中兴通讯作为业内领先的综合解决方案提供商,借助自身丰富的IPv6建网经验,助力中国电信打造世博会IPv6园区网。     

基于移动IPv6技术的无线城域网QoS研究

重点介绍了无线城域网中有关IPv6的QoS保证机制．为了提供端到端的QoS保证．除了需要在无线空中接口采用业务分类的动态业务流管理机制外．还需要在IPv6核心网络中采用能提供QoS保证的移动路由管理机制。并对各种支持移动性的InterServ、DiffServ和MPLS等QoS保证机制进行了研究和比较，建议在基于移动IPv6技术的无线城域网中采用扩展的MPLS机制进行核心网的QoS保证。     

移动互联网的端到端QoS的几点思考

移动互联网是互联网与移动通信系统的融合与发展,随着移动互联网的高速发展,用户对移动场景下的移动互联网服务质量及有线网络的服务质量的要求越来越高,希望可以实现移动互联网的无延迟、无阻塞、高质量服务。但由于移动网络的资源及拓扑结构具备动态性,这就增加了实现移动互联网端到端QoS的难度。为实现移动互联网中端到端QoS,就需要在移动互联网体系结构的基础上,解决移动管理、移动QoS协议、无线资源管理、分组调度等关键技术。     

CDMA 2000 1xEVDO Rev.A系统的QoS应用

随着数据用户和数据业务的迅猛发展,运营商网络的承载压力不断加大,如何综合考虑网络资源利用最大化和用户间公平性,是目前网络运行商面临的主要问题。文章对QoS概念、QoS模型、3G业务的QoS分类以及CDMA 2000 1xEVDORev.A端到端QoS的体系结构进行了说明,并对EVDORev.A系统中端到端QoS保证的系统实现进行了介绍。文章认为第三代无线通信技术CDMA 2000 1xEVDORev.A能提供端到端的QoS解决方案,它不仅增强了对实时业务的支持,还可以大大提升网络服务性能。     

移动IPv6网络中的QoS及其实现探讨

由于移动环境的特殊性，使得在移动网络中提供服务质量（QoS）变得非常复杂。文章首先分析了基于RSVP的移动IPv6QoS解决方案，然后引入了一种新的IP通用信令体系——NSIS，并讨论了NSIS在移动IPv6网络QoS中的应用。     

MPLS网络中的QoS实现方法研究

在因特网中实现各种业务的QoS保障是目前通信网络的研究热点。本文就当前IETF(InternetEngineeringTaskForce)提出的两种QoS实现的主要解决方案:集成服务模型Int-Serv和差分服务模型Diff-Serv进行研究,给出了两种方案在多协议标签交换MPLS(MultiprotocolLabelSwitching)网络中具体的实现过程。     

Diffserv—为Internet服务质量护航

Ｄｉｆｆｓｅｒｖ是当前Ｉｎｔｅｒｎｅｔ研究领域的一个热点,它不仅具有良好的可扩展性和抗毁性,在服务质量保证方面优于Ｉｎｔｅｒｎｅｔ和ＭＰＬＳ,还可支持多播服务,存在着无限的发展潜力。本文描述了Ｄｉｆｆｓｅｒｖ体系结构以及它与几种服务质量保证机制的比较,指出了目前Ｄｉｆｆｓｅｒｖ研究的一些热点问题。     

Architecture and Experimental Framework for Supporting QoS in Wireless Networks Using Differentiated Services

This paper describes the design and implementation of an enhanced Differentiated Services (Diffserv) architectural framework for providing Quality of Service (QoS) in wireless networks. The Diffserv architecture has been recently proposed to complement the Integrated Services (Intserv) model for providing QoS in the wired Internet. The paper studies whether Diffserv, as defined for wired networks, is suitable for wireless networks. The proposed wireless Diffserv framework takes into consideration several factors, including signaling requirements, mobility, losses, lower wireless bandwidth and battery power constraints. It identifies the need for supporting signaling and mobility in wireless networks. The framework and mechanisms have been implemented in the wireless testbed at Washington State University. Experimental results from this testbed show the validity of the proposed Diffserv model and also provide performance analyses. The framework is also designed to be extensible so that other researchers may use our implementation as a foundation for implementing other wireless network algorithms and mechanisms.     

结合集成服务、差分服务和MPLS实现端到端QoS保证

文章论述了当前流行的多种Qos（服务质量）解决方案，详细分析了这些方案的优缺点。最后综合这些方案优点．提出了一种新的端到端的QoS解决方案。该方案通过在MPLS（协议标签交换）的基础上结合集成服务、差分服务以及流量工程的思想，在实现端到端QoS保证的同时实现了优化路由和负载均衡。     

A Quality of Service Support Module (QASM) for a Wireless Multi-Segment Integrated 3G Network

Deployment of IP multimedia services with guaranteed Quality of Service (QoS) is a primary requirement for Beyond 3G (B3G) systems. In this paper we propose a new architecture to support Internet QoS-sensitive services (e.g., video-conferencing, voice over IP, interactive gaming), thus providing users with end-to-end QoS guarantees. In particular, the paper discloses a new hybrid Intserv/Diffserv scheme for handling IP packets and an interworking procedure with the RSVP protocol which allows to support QoS over an integrated, multi-segment network. Such scheme is implemented by means of a suitable Quality of service Support Module (QASM). Advantages and drawbacks of QASM are discussed and the impact on both system architecture and Multi-Mode Mobile Terminal is investigated. Performance evaluations, carried out via computer simulations, confirm the effectiveness of the proposed solution.     

Experimental TCP Performance Evaluation on Diffserv AF PHBs over ATM SBR Service

In these days, IP network customers become sensitive to the QoS guarantee provided by the network. Amongst many QoS guarantee schemes, Diffserv (Differentiated Services) is the one of the most practical candidates for the next generation IP networks. Under these circumstances, the commercial network venders have already provided the Diffserv routers that support EF (Expedited Forwarding) PHB (Per Hop Behavior). However, AF (Assured Forwarding) PHB in Diffserv still has not been provided by commercial routers. Therefore, it is a realistic solution that SBR3 (Statistical Bit Rate 3) of ATM emulates AF PHB, but it is not clear whether TCP traffic over AF PHB emulated by ATM is differentiated from the best effort TCP traffic over DF (Default Forwarding) PHB. To confirm the differentiation, we have experimentally studied TCP performance through the link into which TCP connections over AF PHB and DF PHB are aggregated. This paper describes the experimental results and discusses the possibility of the TCP performance differentiation between AF PHB and DF PHB over ATM.     

基于QoS保证的蜂窝系统接入算法研究

无线通信系统中的关键技术之一就是无线接入控制,它将影响用户终端传输语音和数据业务时得到服务质量的好坏.本文针对3G系统各种业务的特点论述了能有效保障QoS的上行接入控制方案,并据此提出了一种新的接入算法-PCD(Priority Code based Diffserv)算法.它的特点是依据具体业务的分类和QoS指标来分配网络资源,支持大量的用户拥有合理的服务质量水平,有效的解决了上行接入控制.文中设计了实时和非实时业务呼叫的信令流程,并对提出的算法和现有的接入算法进行了仿真评估.     

IP QoS综合服务模型研究

本文讨论了一种资源预留和QoS控制模型。对该模型中的接纳控制、策略控制和调度算法进行了分析,并且讨论了模型的核心协议－资源预留协议（RSVP）,从讨论中可以看到,该模型能在IP网上提供不同级别的QoS以满足不同的需求。     

QoS enabled voice support in the next generation Internet: issues,existing approaches and challenges

The Internet is under rapid growth and continuous evolution in order to accommodate an increasingly large number of applications with diverse service requirements. In particular, Internet telephony, or voice over IP is one of the most promising services currently being deployed. Besides the potentially significant cost reduction, Internet telephony can offer many new features and easier integration with widely adopted Web-based services. Despite these advantages, there still exist a number of barriers to the widespread deployment of Internet telephony. The most prominent one, however, is how to ensure the QoS needed for voice conversation. The purpose of this article is to survey the state-of-the-art technologies in enabling the QoS support for voice communications in the next-generation Internet. In this article, we first review the existing technologies in supporting voice over IP networks, including the basic mechanisms in the IETF Internet telephony architecture and ITU-T H.323-related Recommendations. We then discuss the IETF QoS framework, specifically the Intserv and Diffserv framework. Finally, we present two leading companies' (Cisco and Lucent) solutions to offering IP telephony services as examples to illustrate how real systems are implemented     

基于区分服务的IP QoS控制技术

为了提供服务质量保证和支持实时应用,传统IP网络的服务模型已经被扩展,区分服务模型是其中重要的一种。这里首先概述了基于区分服务的IPQoS的控制技术,介绍了一种使用QoS管理器和反馈功能控制QoS的体系结构。该结构的标记器和整形器/策略器的参数受来自计量器的反馈的影响,并且QoS管理器能够使管理员动态地调整控制参数。