保证型QoS服务CSBP控制技术研究

提出了保证型QoS服务的CSBP控制技术，它能够保证每个数据流的预约速率，数据流分组经过网络后有确切的时延上界，核心路由器不需要维持有关每个数据流的状态信息。CSBP控制技术融合了集成服务和区分服务这两大类解决方案的优点，提供了具有高水平的服务质量保证，兼顾了网络资源利用率和扩展性。     

一种在MPLS网络中提供单流QoS保障的区分服务标记方法*

为了在MPLS网络中提供对单流的高质量服务,提出了一种基于网络的、供应方的区分服务标记方法。在数据流进入网络前按交换路径进行逐点的接入控制,再将许可的资源预留作为流状态安装在入口路由器上。在传输时,数据流在入口路由器按资源预留标记为预留内/预留外,网络节点按不同的标记队列进行区分处理。该方法提出按预留带宽标记数据流,将基于单流的资源预留定量地映射为基于行为聚合的PHB标记,实现了从集成服务到区分服务的融合。其一方面避免了拥塞,提供了对单流的定量服务质量保证;另一方面无须在核心路由器安装流状态和实现流管理,保持了区分服务的可扩展性。     

支持区分服务的边缘路由器

本文描述Internet中的QoS技术一区分服务,详细分析区分服务中提供的各种服务、推荐的码点（DSCP）及其转发行为（PHB）之间的映射关系,论述了在边缘路由器中实现各种服务的关键技术。     

高性能路由器QoS机制的研究

深入分析了Qos技术的研究热点一区分服务，提出了区分服务网络边缘到边缘Qos保证的参考模型，在此基础上提出了高性能路由器的结构模型，研究结果能对支持Qos的高性能路由器产品的研制与开发提供参考。     

实时多媒体服务端到端QoS解决方案

区分服务（Diif-Serv）模型其主要是通过实时多媒体通信数据包进行分类和策略控制来达到调节网络资源的目的，从而实现对实时多媒体服务端到端服务质量QoS。如何时多媒体网络系统中的不同的信息流进行正确的区分服务．然后对不同类别采取不同的服务策略和拥塞管理，从而对网络资源进行有效配置，是实现实时多媒体服务端到端服务质量QoS的关键步骤。文章重点对实时多媒体信息如何进行分类及相应的服务策略和拥塞管理进行时比研究，提出实现端到端QoS服务质量的具体措施和解决方案。并在Cisco思科路由器和交换机建立的DiffSeFV网络环境中进行验证，实验结果表明。对实时多媒体信息进行合理的分类及采用相应服务策略．能很好地实现实时多媒体信息流端到端的服务质量QoS。最后阐述了Diffsenr区分服务存在的问题和未来的发展趋势。     

基于QoS的WDM网络中多等级服务问题研究

针对WDM网络中波长和路由分配(RWA)问题，提出了一种具有QoS保证的多等级服务的方法。通过使路由器根据路由表为到达的分组数据提供等级服务，不仅可以有效地解决WDM网络中分组数据阻塞的问题，实现区分服务，而且可以提供更好的QoS保证。文中也给出了计算机仿真结果。     

区分服务网络中基于主动队列管理的病态流控制

在区分服务（Differentiated Services，DiffServ）网络中，为了消除病态流对确定性转发（Assured Forwarding，AF）服务的不良影响，提出了一种基于RIO（RED IN and OUT）的主动队列管理机制RIO SD。这种机制不需要在核心路由器维护每一个流的状态，而是通过观测虚拟队列的丢包历史记录来鉴别病态流，并通过虚拟队列的前置滤波器加大病态流的丢包率，实现对病态流的控制。仿真结果表明RIO SD可以有效抑制病态流对带宽的占用，提高其他正常流的性能。     

区分服务Diffserv在高性能路由器中的实现

区分服务Diffserv在QOS网络体系结构越来越受到广泛的应用,它具有很强的扩展性。本文给出了一种高性能路由器中支持Diffserv的实现方案。重点介绍了数据包分类机构和流量控制机构的实现。该实现方案在国家863项目“可扩展到T比特的高性能IPv4/v6路由器基础平台及实验系统”上测试已通过,并取得了较好的结果。     

基于区分服务的IP QoS实现技术

文章讨论了基于区分服务（DiffServ）的IP网络中,路由器转发IP分组的三种模式（EF、AF、DE）,讨论了边缘路由器对IP分组进行分类、测量、标记、整形和丢包的处理方法,分析了区分服务与服务水平协议（SLA）结合的重要性,给出了支持端到端实时业务传输QoS的基于区分服务的IP网络结构。     

华为基于路由器的POS接入

华为针对银行POS业务的特点和POS接入系统的业务要求，提供了全新的、具有高性价比的基于路由器POS接人解决方案。 在基于系列化的路由器平台上，华为推出了完整的银行POS接人解决方案，可以在Quidway1760低端路由器、Quidway262X系列路由器等多个型号的基础上，提供不同密度的解决方案，     

Monitoring Edge-to-Edge Traffic Aggregates in Differentiated Services Networks

Differentiated Services (DiffServ), which are currently being standardized in the IETF DiffServ working group, is a solution that can provide different qualities of service to different network users. DiffServ aggregates network packets at edge routers and forwards the aggregated packets to core routers with different priorities. In this paper, we propose methods using the SNMP framework for monitoring edge-to-edge traffic aggregates in a DiffServ domain, which consists of a set of DiffServ-enabled routers. In order to manage each DiffServ router, we have analyzed the DiffServ MIB and instrumented it in the router. Further, we propose monitoring behaviors of edge-to-edge traffic aggregates by combining topology and performance information from MIB II and DiffServ MIB. Construction procedures and graphical representation of the edge-to-edge traffic aggregates are explained in detail. We also extend our efforts to implement a DiffServ domain monitoring system that monitors a set of DiffServ-enabled routers and traffic aggregates between every edge router pair. We believe that the proposed monitoring methods can serve as useful building blocks for managing DiffServ networks.     

FIAC: a resource discovery-based two-level admission control for differentiated service networks

Differentiated Service (DiffServ) architecture has been proposed as a scalable QoS architecture for Internet. DiffServ, however, could not control its loads under heavy traffic conditions, and it could not provide strong QoS responses for individual traffic flow. This paper introduces at the edges of a DiffServ domain, a novel two-level admission control scheme, the Fair Intelligent Admission Control (FIAC). At per-class level, FIAC admits traffic according their fairshare and usage while preventing possible congestion within the DiffServ core. At per-flow level, FIAC estimates and allocates the fairshare for each flow within a class.

Simulation results demonstrate that FIAC adheres extremely well to the bandwidth requirements of DiffServ classes while preventing congestion within the DiffServ core. With FIAC's per-flow level enabled, FIAC is able to prevent uncontrolled UDP flows from depriving TCP-controlled flows of bandwidth share when they are aggregated to the DiffServ domain.     

Quality-of-service mapping mechanism for packet video indifferentiated services network

This paper presents a futuristic framework for quality-of-service (QoS) mapping between practically categorized packet video and relative differentiated service (DiffServ or DS) network employing unified priority index and adaptive packet forwarding mechanism under a given pricing model (e.g., DiffServ level differentiated price/packet). Video categorization is based on the relative priority index (RPI), which represents the relative preference per each packet in terms of loss and delay. We propose an adaptive packet forwarding mechanism for a DiffServ network to provide persistent service differentiation. Effective QoS mapping is then performed by mapping video packets onto different DiffServ levels based on RPI. To verify the efficiency of proposed strategy, the end-to-end performance is evaluated through an error resilient packet video transmission using ITU-T H.263+ codec over a simulated DiffServ network. Results show that the proposed QoS mapping mechanism can exploit the relative DiffServ advantage and result in the persistent service differentiation among DiffServ levels and the enhanced end-to-end video quality with the same pricing constraint     

移动IPv6中端到端Diffserv QoS上下文转移框架

提出了一种移动IPv6端到端的DiffServ上下文转移框架，采用COPS-SLS协议作为DiffServ在移动环境下的信令机制来实现端到端的域间SLS动态磋商，使用端到端的上下文转移方法来重建DiffServ上下文可以避免重新发起COPS-SLS信令，并且端到端的DiffServ上下文仅在新增加路径中的QB间进行转移。该方法能减少切换时的服务中断，当MN切换时，实时应用能迅速得到与切换前相同的转发处理。     

DiffServ模型中主动队列管理研究

区分服务模型是现代大规模网络保证IP QoS的主要模型,该模型是当前互联网通讯性能方面研究的热点问题。在改进RIO-C算法的基础上,提出了一种适合于区分服务模型的主动队列管理算法-PFRIO（RIO based on Priority and Fair）。该算法提高了带宽分配的公平性,增强了网络对突发数据流的处理能力,有效改善了区分服务模型的总体性能。     

基于Linux的区分服务实现与缓冲管理机制RSRD的评价

论文首先阐述了区分服务的体系机构和实现要点,然后结合Linux中的流量控制框架探讨了Linux下实现区分服务的关键技术。此外还研究了区分服务中的缓冲机制,并在RIO算法的基础上提出了一个用于区分服务的缓冲管理机制RSRD。在实验系统中运行表明,该机制行之有效,并且有很好的区分性能。     

DiffServ for differentiated reliability in meshed IP/WDM networks

The protection of service delivery in an integrated network is fast becoming a critical issue. In previous work, we proposed two protection methods, DiffServ and DiffProtect and examined, on a small network, whether DiffServ can be used as a protection mechanism against failures in IP/WDM networks. The results showed that, on average, DiffServ can provide better QoS guarantees than its optical counterpart, DiffProtect. We also found that DiffProtect may perform better than DiffServ under some extreme failure situations so that DiffServ cannot totally replace optical protection in a network but might be able to do so to some degree. We extend these results to larger networks and more complex combinations of protection techniques. We study in this paper a 4-node linear topology and a small 6-node mesh network which can be protected by DiffServ, DiffProtect or even a combination of both (MixProtect). Results show that replacing optical protection by DiffServ cannot be done randomly and that the number and position of links protected by DiffServ versus DiffProtect must be carefully chosen in order to guarantee adequate performance to all traffic types. We explain how this can be achieved with current technology. We also show that the cost of protection using DiffServ is significantly less than that of current methods.     

基于Linux流控机制的QoS网络

对Linux内核中的流控机制进行剖析，以区分服务(DiffServ)模型为侧重点，根据区分服务模型的体系结构，提出了利用Linux流控机制实现加速转发逐跳行为的应用方案。实验表明，该方案适合于QoS网络的构建。     

区分服务网络中IP多播:问题与解决方案

在下一代因特网中,越来越多的应用将会需要网络提供一定的服务质量以及进行多播传输．因为区分服务体系结构提供了一种可扩展的QoS解决方案,而多播传输则提供了一种节约网络资源的有效方法,二者的集成成为必然趋势．但是,由于区分服务体系结构与多播树结构上的差异,二者的集成存在着一些问题．详细分析了区分服务网络中进行IP多播传输可能出现的问题,并且对近年来提出的各种解决方案进行了分类比较和深入剖析,同时指出了在这一领域中未来的研究方向．     

Quantitative adaptive RED in differentiated service networks

This paper derives a quantitative model between RED (Random Early Detection ) maxp and committed traffic rate for token-based marking schemes in DiffServ IP networks.Then, a DiffServ Quantitative RED( DQRED) is presented ,which can adapt its dropping probability to marking probability of the edge router to reflect not only the sharing bandwidth but also the requirement of performance of these services,Hence,DQRED can cooperate with marking schemes to guarantee fairness between different DiffServ AF class services,A new marking probability metering algorithm is also proposed to cooperate with DQRED ,Simulation results verify that DQRED mechanism can not only control congestion of DiffServ network very well,but also satisfy different quality requirements of AF class service.The performance of DQRED is better than that of WRED.