基于策略的GMPLS PON网络管理研究

阐述基于GMPLS协议的无源宽带光接入网技术(GMPLSPON),从统一接入网和骨干网网络管理的角度探讨此种方案的优越性。根据MPLS网络中实施策略管理的原型以及基于策略的端到端QoS网络管理环境,针对PON的特殊结构提出GMPLSPON的管理机制的构想。给出接入网策略管理的框架,并进行简单的功能分析。     

上海贝尔端到端LTE解决方案

介绍了上海贝尔的LTE端到端解决方案,该方案包含eUTARN、ePC、移动网络演进传送构架（META）和业务分发环境（SDE）;阐述了上海贝尔采用统一通用平台、融合演进的eNodeB对2G/3G网络的向下兼容;提供了完美的QoS保障和业务流量管理的分组演进核心,并为适应无线网络演进提出了全新的传送网络构架来支持2G/3G和LTE网络传输和未来演进。     

GMPLS在PON中的应用

首先对无源宽带光接入网(PON)技术和通用多协议标签交换协议(GMPLS)进行回顾,然后根据现有PON技术的缺陷和目前全光智能网的研究趋势提出一种全新的PON模式,即基于GMPLS协议的无源宽带光接入网技术(GMPLSPON)。介绍了GMPLSPON的技术概念,对GMPLSPON的关键技术进行初步的探讨。     

IntServ模型在无源光接入网络中的应用研究

比较了两种QoS服务模型,区分服务模型(DiffServ)和综合服务模型(IntServ)。分析了现有EPON中QoS模型的特点,提出了将Inter-Serv模型应用到无源光接入网中的思想,并给出了ONU内部的QoS调度模型。通过仿真验证了在无源光接入网中应用IntServ模型能对高优先级业务提供更好的QoS服务。     

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。     

基于业务特征的TDD-LTE端到端QoS参数研究

针对移动互联网快速发展对无线接入网的高带宽和业务质量需求,首先进行了常用的移动互联网业务研究分析;其次,依据业务特性、3GPP网络协议规范和本地已部署的TDD-LTE网络结构,提出了端到端QoS设置模型;最后,在商用网络上进行QoS 参数部署验证。研究结果表明：在典型高速率业务环境下,TDD-LTE单小区峰值调度用户数增加253.92%;在现网混合业务拥塞环境下,TDD-LTE 单小区峰值调度用户数增加81.80%。研究结果具备良好的行业应用性和推广性。     

IP RAN端到端QoS保障技术剖析

首先对无线接入网络IP化的研究现状进行介绍,然后对端到端QoS体系结构与实现的相关技术进行阐述,最后对不同网络的IP QoS进行归纳和总结,并对其面临的挑战进行分析.     

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。     

IMS网络端到端QoS控制机制研究

IMS网络的端到端QoS控制技术是目前研究的热点,文中阐述了基于策略的网络管理架构在IMS网络中的应用,并深入研究了IMS网络不同层次间相互协作实现QoS技术和多域环境下的端到端QoS管理的策略控制结构.     

IP城域网端到端QoS部署与优化研究

当前IP城域网负责的新业务给原本的网络传送方式带来了挑战,若想提升IP城域网负责业务的综合承载能力,则需要优化QoS技术。通过分析IP城域网端到端的QoS部署原则,围绕服务模式、分类、流量调整、网络拥塞解决等方面探究QoS部署和优化策略,为运营商解决QoS部署存在的问题并提供指导,总结QoS部署与优化策略的关键点。     

End-to-end QoS resource management for an IP-based DWDM access network

The ever-increasing use of broad-band Internet and complex multimedia applications is pushing fiber closer and closer to the homes. Within the European project IST HARMONICS (Hybrid Access Reconfigurable Multi-wavelength Optical Networks for IP-based Communication Services), an optical access feeder network and resource management framework were developed that tackle this demand for bandwidth and the desire to stimulate the convergence of last-mile access technologies. To cope with the lack of bandwidth in the access and last-mile networks and the different needs of applications and users, the developed management system provides end-to-end quality of service (QoS) while integrating multiple technologies. In this paper, a detailed overview of the end-to-end QoS management framework and novel time slot/wavelength MAC protocol for the optical feeder network is given. End-to-end QoS is based on Differentiated services (DiffServ) at layer 3, various QoS supporting technologies at layer 2, and QoS mappings between both layers. The paper will also focus on the field trial results of the HARMONICS project and give some guidelines for possible problems and solutions in this area.     

A differentiated optical services model for WDM networks

This article addresses the issues of scalable end-to-end QoS in metropolitan DWDM networks serving as transit networks for IP access networks. DWDM offering a few wavelengths has been deployed in the past in backbone networks to upgrade point-to-point transmission where sharing is based on coarse granularity. This type of DWDM backbone network, offering a few light-paths, provides no support for QoS services traversing the network. As DWDM networks with larger numbers of wavelengths penetrate the data-centric metro environment, specific IP service requirements such as priority restoration, scalability, dynamic provisioning of capacity and routes, and support for coarse-grain QoS capabilities will have to be addressed in the optical domain in order to achieve end-to-end QoS over a DWDM network. We propose a QoS service model in the optical domain called differentiated optical services (DoS) based on a set of optical parameters that captures the quality and reliability of the optical lightpath     

COPS-SLS usage for dynamic policy-based QoS management over heterogeneous IP networks

While each IP domain can deploy its own strategy to manage network resources, multimedia traffic needs end-to-end QoS management to obtain an overall service level. The provision of end-to-end QoS over a heterogeneous environment implies the negotiation of a mutually acceptable SLA. This article presents the use of the COPS-SLS protocol as a generic protocol for automatic service-level negotiation and the integration of this protocol in an overall QoS management architecture to manage service levels over multiple domains deploying different QoS technologies.     

A Bandwidth Control Method Providing Entrance QoS for Multimedia Communication

1 Motivation Nowadays , the QoS provided by the wideband IPnetwork starts at an edge-router and ends at anotheredge-router .Therefore ,the trunk QoSisfinished,suchas RSVP[1]and DiffServ[2].In order to complete theend-to-end QoS,the mechanism of entrance QoS (thebandwidth controller) is introduced. As Fig.1 shows ,if the bandwidth controller circledby the dashed frame is not used,the Ethernet is con-nected with the router directly through 100 Mbit/sbandwidth. Then this router is connect…     

A management and control architecture for providing IPdifferentiated services in MPLS-based networks

As the Internet evolves toward the global multiservice network of the future, a key consideration is support for services with guaranteed quality of service. The proposed differentiated services framework is seen as the key technology to achieve this. DiffServ currently concentrates on control/data plane mechanisms to support QoS, but also recognizes the need for management plane aspects through the bandwidth broker. In this article we propose a model and architectural framework for supporting DiffServ-based end-to-end QoS in the Internet, assuming underlying MPLS-based explicit routed paths. The proposed integrated management and control architecture will allow providers to offer both quantitative and qualitative services while optimizing the use of underlying network resources     

End-to-end delay differentiation mechanism for integrated EPON–WiMAX networks

For integration of Ethernet passive optical network and IEEE 802.16 WiMAX, it is imperative to provide end-to-end quality of service due to the heterogeneous MAC nature of EPON and WiMAX. To address this issue, this paper proposes a QoS-enabled transmission mechanism operated on a specially devised hybrid optical network unit-base station architecture for QoS support, especially delay differentiation, between EPON and WiMAX. Simulation results show that the proposed scheme outperforms the existing transmission mechanisms in terms of the end-to-end delay and jitter, due to its QoS continuity between them.     

浅谈无线IP网络中的QoS规范

随着下一代网络的飞速发展,用户之间可以通过多种多样的无线设备相互联络,而这些无线设备则通过一个基于IP的核心网络所提供的无线链路相互连结的。虽然存在如IP协议之类的共同规范,但是要将许多不同的网络融合起来,而这些网络有着各自不同的QoS模型,这无疑将使端到端的QoS保证变得更加复杂。文中讨论了对端到端QoS协议进行标准化的必要性,重点研究了位于服务层的QoS规范,提出了一种通用服务规范(GSS),并对端到端提供QoS保证的服务等级进行了规范。     

Wireless video applications in 3G and beyond

This article surveys wireless video applications that have been commercialized recently or are expected to go to market in 3G (and beyond) mobile networks, mainly covering error control technologies in view of "wireless video." We introduce several related 3GPP standards including circuit-switched multimedia telephony, end-to-end packet-switched streaming, multimedia messaging service, and multimedia broadcast /multimedia service. We also review the supporting technologies for those four applications. The article concludes with a discussion of error control and rate control adaptability to network QoS variation, which is distinct from wired networks and critical to wireless networks. With respect to MBMS, we point out that required cell transmission power is crucial when realizing meaningful multicast coverage, and suggest a system that integrates different unicast and multicast networks, application-layer data repair, and transmission scheduling.     

A practical architecture for implementing end-to-end QoS in an IPnetwork

All critical elements now exist for implementing a QoS-enabled IP network. It can be built on commercially available platforms and then evolve by adopting emerging standards and technologies. This article describes a practical architecture for end-to-end QoS in an IP environment including incorporation of established, as well as developing, IP and QoS technologies. The article combines the IETF QoS mechanisms with the LAN aspects of QoS and QoS for VoIP-areas usually considered separately. Proposed solutions span across different technologies, e.g., preservation of IP-based classification in MPLS headers, identification of flows encrypted within IPSec during WAN handling, traffic shaping in the access to enable grooming diverse applications and VPNs in the WAN, and so on. VoIP receives special emphasis because of its unique features, such as call setup signaling and call admission control, rarely addressed in traditional IP QoS discussions. An attractive scenario for the IP QoS implementation is to provide a multiservice environment between large enterprise premises over a service provider's core network. A successful end-to-end realization of this service presumes well-defined interworking between the SP's and customers' networks. It will take place on several levels including IP signaling, VoIP setup and CAC, policy interworking, and exchange of billing information. The article recommends to establish SP's presence at the enterprise premises and to implement interworking entities such as the proposed QoS customer server and QoS network server     

Mobility,wireless and QoS

The proliferation of wireless local area networks has opened doors to numerous service opportunities. However, they tend to be limited to delay-tolerant applications. We envisage an environment where a single device is used for all types of communication and roaming freely between different wireless and wired technologies and network operators. To achieve this will require quality of service (QoS) handled appropriately. Within the IP community, QoS has generally been considered end-to-end over the fixed network. Wireless networks and mobile users add a new set of problems, which have only seen highly specialised solutions within the 2G/3G mobile telephone communities. This paper examines these problems and proposes a solution whereby QoS is dealt with by the end terminals through adaptive applications and end-to-end congestion control. This does not require explicit knowledge of the type of network, and does not need expensive whole network upgrades. We believe that this approach can improve the experience of users of current wireless LAN networks, and we are currently verifying and exploring our ideas on a WLAN test bed.