5G NSA网络端到端差异化QoS策略研究

通过将不同的业务、用户映射到不同的QCI类型承载,并对不同的QCI类型承载配置不同的QoS参数,可以实现基于业务和用户的网络差异化服务。首先对NSA网络进行整体介绍,明确NSA网络无线承载类型,并逐一介绍相关的QoS参数。之后从业务差异化和用户差异化2个维度,制定相应的QoS策略,同时基于不同的策略,对无线网、传输网和核心网参数进行统一梳理,实现5G NSA网络端到端差异化QoS参数的合理化、标准化。     

一种异构网络中基于聚集流的水平QoS映射方法

保证无线异构网络端到端QoS需求,同时兼容现有网络业务和未来需求,是下一代网络的一个研究热点。QoS映射是保证异构网络端到端QoS的有效方法。该文提出一种基于聚集流的QoS映射方法(QoS Mapping Technology based on Flow Aggregate, QMT-FA),该方法在现有物理网络上建立虚拟的流处理层,在流处理层,原网络中的QoS参数被映射执行器透明封装,映射执行器根据网络情况决定是原样转发还是解聚集。通过建立基于高维的聚集流映射空间,屏蔽了多级网络间映射累积误差影响终端网络QoS指标,保证了异构网络端到端QoS;基于聚集流的QoS映射方法具有较好的可扩展性和伸缩性,能应用于现有的各种异构网络系统和应用业务。最后,通过数值和仿真分析验证了该方法的有效性。     

战术异构网络互联端到端QoS研究

战术异构通信网络的融合,需要更完善的端到端服务质量（Quality of Service,QoS）体系。在研究和分析战术异构通信网特点后,分析总结出战术异构通信网络端到端QoS研究内容,并参考下一代网络QoS框架结构,提出了基于策略的QoS架构模型。最后阐述了所涉及的关键技术,用于解决在战术异构通信网中不同业务在跨网络传输时端到端QoS保证,合理利用无线网络资源,有效提高数据传输性能等问题。     

端到端的LTEQoS控制技术与策略研究

LTE网络提供了非常重要的QoS保证特性,为实现差异化服务和网络资源智能化管理提供了重要手段,然而,端到端QoS控制也是LTE技术的难点。分析了LTE QoS控制对象的含义、类型以及LTE QoS参数,并提出从业务支撑系统到LTE网络的端到端QoS控制架构以及系统控制流程,最后探讨了LTE QoS的控制策略。     

LTE核心网中基于PCC的QoS控制和能力开放技术研究

在LTE核心网中,通过引入PCC机制,来实现应用层业务数据流QoS需求到核心网承载层QoS分组过滤器之间的一致性映射和匹配问题。文章在详细介绍和分析LTE核心网中承载层QoS机制和PCC总体架构的基础上,研究如何将二者结合起来实现基于PCC和网络能力开放平台的QoS控制,从而提升运营商掌控网络提供业务的能力并改善用户的业务体验。     

端到端IP QoS体系结构及实现

IP QoS是IP网络的核心技术,实现IP QoS的机制有多种,如子带宽管理、MPLS、IntServ和DiffServ等,这些机制可以结合起来实现更为完善的IP QoS。按照“将面向用户的、复杂的部分留在边缘,保持主干的简单性”的原则,在网络边缘采用IntServ,在网络主干采用DiffServ,在经过ATM网络时利用MPLS实现IP QoS到ATM的映射。这种体系结构可以实现彻底的端到端IP QoS,描述了这种体系结构及其实现。     

EV-DO系统支持差异化服务的QoS应用研究

EV-DO系统是专门针对移动多媒体应用进行优化的无线传输技术.本文概述了EV-DO Rev A系统的QoS机制及端到端QoD体系架构,分析了EV-DO系统为不同用户、不同业务提供差异化服务的QoS需求,探讨了EV-DO系统支持差异化服务的端到端QoS技术及应用,并指出了进一步改进分组调度算法和速率控制技术以优化无线资源管理,从而满足用户公平性、不同用户和业务的QoS要求.     

保证NGN端到端QoS的软时隙技术

QoS无保障,一直是NGN不能广泛商用的障碍所在。该文提出一种"软时隙"技术,融合TDM中的时隙控制技术与分组网络的数据传输技术于一体,为NGN中的流媒体业务提供端到端的服务质量(QoS)保证。"软时隙技术"在数据链路层的数据包头,插入"软时隙标签"来区分普通数据业务与流媒体业务,对两类业务分别采用独立的控制机制来保证各业务需要的QoS。对普通数据业务,采用分组网络成熟的路由与交换机制;对流媒体业务,采用PSTN网络的信令模式控制路由呼叫过程与建立端到端面向连接的业务通道。统一分组传送与区别交换控制相结合,兼顾数据业务性能,充分保证流媒体业务连接端到端具有稳定带宽与稳定时延的服务质量(QoS)。     

家庭宽带IPTV业务开展策略

IPTV业务与互联网电视业务在业务上最大的区别是可以提供直播业务,但在系统部署方面,云管端等各部分对网络的要求均有不同.介绍了电视业务发展形态和业务平台建设模式,并从平台、CDN、城域数据网、汇聚传输、PON接入、端到端多播、端到端QoS、视频终端方面分析了运营商开展IPTV业务需要进行的网络及设备改造策略.     

内嵌MPLS的多业务传送平台(MSTP)

内嵌MPLS的MST不但保证了多种网络的互连互通,而且能够对接入业务有效地实施端到端的流量工程,提供有效的QoS保证。介绍了内嵌MPLS多业务传输平台的体系结构、功能模型,并详细阐述了内嵌MPLS的PW(PseudoWire)接入方法,及对以太网业务在内嵌MPLS的MSTP网中的传输和映射处理。     

Quality of service in telecommunications .II. Translation of QoSparameters into ATM performance parameters in B-ISDN

The main goal of this article is to present the translation of quality of service (QoS) parameters between layers. The QoS parameters in the ATM layer and AAL are defined. This translation concept came from the QoS framework in which the influence of the protocol stack on the QoS should be considered. As an example, we concentrate on the translation from the AAL to the ATM layer, as the AAL must be designed to be service-dependent and specific. Translation, both taking the transport protocol into account as well as between application and transport QoS, needs further study. However, our study shows that the QoS translation is a possible and good approach in end-to-end QoS guarantees in the broadband integrated services digital network (B-ISDN). As far as the end-to-end QoS guarantee issue is concerned, the transport QoS requirements are specified in terms of bounds on transport QoS parameters. The bounds on transport QoS parameters will be translated into the bounds on ATM layer QoS parameters. The ATM-layer QoS parameters resulting from the translation will be the performance requirements on a connection basis for the ATM network, but are basically the end-to-end parameters, including the network and the end systems. Therefore, the QoS translation finally results in the network performance parameters in the ATM network. We define QoS parameters in the AAL and ATM layer. Case studies in which the translation method is applied to a constant bit rate (CBR) video service and data service, respectively, are also presented     

Quality-of-service management for broadband residential videoservices

This paper introduces an approach to managing quality-of-service (QoS) for a residential video-on-demand (VoD) service employing MPEG-2 transport streams using an experimental asynchronous transfer mode (ATM)/asymmetric digital subscriber line (ADSL) access network testbed. The paper examines the complex multilayer propagation of ATM layer parameters over an underlying physical layer and their relationship to video quality. The results obtained from the testbed provide an important insight into the factors relevant to the provisioning and management of new multiservice network infrastructures. Overall, these results contribute to an understanding of the multilayer QoS relationship and provide a basis for comparison with, and development of, similar systems. The paper proposes a method to aid the comparison of results based on a multilayer QoS approach     

NGN中资源接纳控制研究进展

下一代网业务控制和传送功能相分离后，为了保证业务的服务质量（QoS），引入了资源接纳控制的概念。通过实行资源接纳控制，资源接纳控制子系统（RACS）向上向业务层屏蔽传送网络的具体细节，支持业务控制与传送功能相分离；向下感知传送网络的资源使用情况，确保正确合理地使用传送网络资源，从而保证业务的服务质量（QoS），并防止带宽和业务盗用现象发生。功能架构、涉及的实体和参考点、接入类型和终端、资源控制模式、功能实体之间的选择机制、不同域之间的互联、和传送控制功能中其他功能之间的交互是资源接纳控制的核心内容。由于TISPANRACS和DITU—T资源接纳控制功能（RACF）的研究重点有差异，因此统一不同组织定义的架构将是各个组织今后研究的重点。     

LTE-Advanced中的QoS参数映射的研究

QoS参数映射提供了一种机制,使得下层能够从上层的信息中获得相关的QoS信息,从而保障整个传输的服务质量。随着LTE-A系统的不断更新演进,在满足系统架构的QoS决定、传递或映射系统信息的功能方面,QoS参数映射起着越来越重要的作用。文章根据LTE-A中的QoS参数映射架构,分析了该架构中各组成部分的功能和作用,对具体参数的映射过程和映射规则做出了详细的说明。     

Parallel transport: a new transport layer paradigm for enabling Internet quality of service

The transport layer in the network protocol stack serves as a liaison between the application and the underlying network. Any quality of service provided by the network thus has to be effectively translated by the transport layer protocol in order to be enjoyed by the applications. In this article, we argue for a fundamental rethinking of the transport layer design to facilitate such QoS delivery. We identify the key requirement for a QoS enabling transport layer protocol as the ability to effectively handle multiplicity in terms of user differentiation levels, network resources, and service models. However, TCP, the transport layer protocol predominantly used in the Internet, is unable to support such multiplicity due to its single-state design. We extend TCP to a parallel transport layer protocol called parallel TCP (pTCP) that can tackle the different dimensions of multiplicity, and hence enable varying classes of QoS to applications. We discuss the applicability of pTCP in three specific domains with different levels of network support for QoS, and present simulation results substantiating our arguments.     

Vertical QoS mapping over wireless interfaces [accepted from open call]

This article focuses on the problem of quality of service mapping between layers in a cascade. Protocol stacks in telecommunications networks are composed of functional layers. QoS provision depends on the performance achieved at each layer and is based on functions performed at layer interfaces. In practice, QoS derives from reliable physical and link layers that can offer specific transport services to upper network layers. The data flows (or bundles of flows) generated by the upper layers (e.g., the network layers) are forwarded down to a physical interface that transports the information along a channel that provides, if possible, the expected QoS to the upper layers. The action is called vertical QoS mapping and poses many challenges for a communication scientist, in particular if it is applied to wireless interfaces. This article states the definition of vertical QoS mapping, proposes a formal separation between technology-dependent and technology-independent layers, models each functional layer as a battery of buffers, generalizes the relation between layers through a chain of buffers in a cascade, formalizes the theoretical problems of vertical QoS mapping, and suggests possible solutions that use dynamic bandwidth allocation schemes.     

基于跨层网络演算模型的无线网络移动性能分析

为了研究终端移动对无线网络服务质量(QoS)的影响,该文建立了跨层网络演算模型来计算通信终端处于不同移动速度下无线网络的延时积压性能参数。该模型的建立结合了跨层分析思想和网络演算理论,将无线网络中网络层、链路层及物理层等层次的特性映射为一系列网络演算模块的串联。基于构造的模型应用网络演算能够方便地推导出终端处于不同移动速度下无线网络的服务曲线,进而计算出网络的延时积压性能。仿真结果表明,构造的跨层网络演算模型可以准确地分析终端在不同移动速度下无线网络的延时积压性能。     

基于QoS的WiMAX与TD-SCDMA网络融合研究

分析了WiMAX的QoS策略和基于IMS的TD-SCDMA系统QoS机制，给出了二者详细的QoS业务类型和要求，提出了在下一代网络IMS框架下采用VoIP技术的TD—SCDMA和WiMAX网络融合架构，并给出QoS融合时不同QoS业务类型的映射方案．     

Quality of service in telecommunications. I. Proposition of a QoSframework and its application to B-ISDN

The the quality of service (QoS) concept is becoming an ever more important issue in telecommunication and computer communication. The article focuses on the QoS notion and concept. The definition of QoS in the International Telecommunications Union-Telecommunications Sector (ITU-T) recommendations and the International Standards Organization (ISO) standards is analysed. Little is known about the asynchronous transfer mode (ATM) performance requirements of the broadband integrated services digital network (B-ISDN) services, especially for multimedia applications. This is because the ATM performance requirements of multimedia applications depend not only on the diverse QoS requirements from application and user, but also on the protocol stacks and scheduling in end systems. Therefore, in order to guarantee QoS to the user, it is necessary to introduce a set of QoS parameters whose properties indicate the nature and requirements of the layered protocol stack. We describe how a proposed QoS framework can be applied to B-ISDN as a specific network. The QoS aspects related to B-ISDN signaling (the control plane) and the QoS aspects related to layer and plane management (the management plane) are described. We also describe how the QoS framework resides in a protocol stack and works together with the B-ISDN network management and signaling