数据业务端到端QoS参数映射与优化

在移动通信网内采用业务质量(QoS,Quality of Service)机制实现差异化的业务传输是近年的研究热点。端到端QoS包括非接入层用户和业务的识别、不同承载间QoS的一致性传递和接入层QoS的正确执行。这里以EDGE网络中数据业务传送机制为基础,全面研究了3GPP的QoS框架在UMTS网络的GERAN A/Gb模式和UTRAN Iu模式中的QoS映射,给出一个经过优化的端到端QoS参数映射表,并基于该表,在真实的EDGE网络中验证了QoS参数优化的可行性和参数映射的一致性。实验结果表明,根据不同业务的特点采用差异化的传输策略可以提升业务的感知。     

移动互联网端到端流量管控策略研究

本文通过对无线网络新技术和新架构的分析,针对2G/3G/LTE/WLAN多网络环境下,研究如何对不同的用户类型、业务类型、时间段、累积量进行QoS控制,以提升业务体验和用户满意度。基于PCC承载架构和ANDSF多连接管理机制,通过端到端的流量管控技术提升互联网带宽的使用率。借鉴都江堰水利工程原理,通过实施网络流量控制、均匀网络流量、降低并有效控制流量峰值,提出了移动互联网网络协同的融合策略控制方案,实现了合理配置网络资源、合理有效控制网络投资,为移动互联网业务发展创造条件,为移动互联网时代应对数字洪水做好充分的技术储备。     

PCC端到端QoS部署策略研究

PCC系统是运营商网络智能化管控的基础,而分级QoS保障是其一项标志性应用,可有效实现基于用户、业务分级及其他组合策略的网络管控。本文从PCC端到端QoS部署关键技术、网络架构、实现机制进行分析,并对PCC端到端QoS实际部署的关键问题进行研究。     

基于QoS的端到端差异化管控策略研究

在目前热点区域资源受限的情况下,本文基于eNode B侧和PCC侧的主要QoS管控能力开展网络差异化管控策略研究,形成无线侧最大聚合比特速率限速管控策略、基于用户的PCC管控策略以及基于业务的PCC管控策略,并在现场环境下完成验证。差异化管控策略能够在容量不足的区域有效保障特定用户/业务感知不受影响或优于普通用户/业务,妥善解决高流量和高负荷带来的整体用户感知问题,且能实现资源投入和经济效益的平衡。     

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.     

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。     

实时业务端到端QoS测评

业务对网络性能的要求直接来源于业务对端到端客户感知(主观质量)的满意程度的需求.尤其对于目前在网络中涌现出的越来越多的实时业务,如VoIP、IPTV、 VOD 等业务对端到端的可用带宽、时延、抖动和丢包十分敏感,这些性能参数严重影响着此类业务的开展和运营维护.这些指标的组合整体反映了承载网络所能提供的QoS,因此准确把握这些网络QoS指标是对网络承载性能进行测评的基础.     

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.     

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.     

IP网基于“互联网+”业务端到端QoS保障策略

目前电信运营商正在积极开展各种"互联网+"业务,针对"互联网+"业务特点研究相应的网络保障策略,实现对"互联网+"业务的有效承载,对运营商的业务发展和网络建设具有重要意义。文章首先对"互联网+"业务进行调研和归类,然后结合各类"互联网+"业务的不同特点,对其QoS(服务质量)需求进行分析,进而提出适用于承载各类"互联网+"业务的承载网络端到端QoS保障方案,实现对"互联网+"业务的有效承载和保障,符合目前运营商的建网思路。     

QoS control in the 3GPP evolved packet system

In this article we describe the QoS concept of the evolved packet system, which was standardized in 3GPP Release 8. The concept provides access network operators and service operators with a set of tools to enable service and subscriber differentiation. Such tools are becoming increasingly important as operators are moving from a single to a multi-service offering at the same time as both the number of mobile broadband subscribers and the traffic volume per subscriber is rapidly increasing. The ?bearer? is a central element of the EPS QoS concept and is the level of granularity for bearer-level QoS control. The network-initiated QoS control paradigm specified in EPS is a set of signaling procedures for managing bearers and controlling their QoS assigned by the network. The EPS QoS concept is class-based, where each bearer is assigned one and only one QoS class identifier by the network. The QCI is a scalar that is used within the access network as a reference to node-specific parameters that control packet forwarding treatment. This class-based approach, together with the network-initiated QoS control paradigm, gives network operators full control over the QoS provided for its offered services for each of its subscriber groups.     

QoS Differentiation in Asynchronous Bufferless Optical Packet Switched Networks

Optical Packet/Burst Switched networks (OPS/OBS) have emerged as promising all-optical network architectures for future core networks due to good resource utilization and the ability to handle high line speeds in a cost-efficient way. Regarding these networks, Quality of Service (QoS) differentiation should be provided in order to give sufficient QoS to real-time applications, and to utilize network resources optimally. In this paper, we present three fundamental different QoS differentiation schemes suitable for asynchronous bufferless OPS. We present analytical models and derive explicit results for the packet loss rates. We then present a general evaluation framework followed by a comparison study of the considered QoS differentiation schemes. Simulation and analytical results show that QoS differentiation schemes based on preemption have better performance than drop based and access-restriction based QoS differentiation schemes.     

一种基于QoS下行资源调度的改进算法

针对LTE系统中用户无线承载QoS要求的不同,提出了一种考虑用户QoS的下行链路资源动态调度改进算法.改进算法在比例公平算法的基础上引入承载的QoS权重值,通过计算出的承载调度值的大小来决定调度承载的顺序.仿真结果表明,改进调度算法可以有效地满足承载的QoS要求,同时保证了用户间的公平性和系统的吞吐量.     

Prioritized burst segmentation and composite burst-assembly techniques for QoS support in optical burst-switched networks

We address the issue of providing quality-of-service (QoS) in an optical burst-switched network. QoS is provided by introducing prioritized contention resolution policies in the network core and a composite burst-assembly technique at the network edge. In the core, contention is resolved through prioritized burst segmentation and prioritized deflection. The burst segmentation scheme allows high-priority bursts to preempt low-priority bursts and enables full class isolation between bursts of different priorities. At the edge of the network, a composite burst-assembly technique combines packets of different classes into the same burst, placing lower class packets toward the tail of the burst. By implementing burst segmentation in the core, packets that are placed at the tail of the burst are more likely to be dropped than packets that are placed at the head of the burst. The proposed schemes are evaluated through analysis and simulation, and it is shown that significant differentiation with regard to packet loss and delay can be achieved.     

Proportional delay differentiation provision by bandwidth adaptation of class‐based queue scheduling

Supporting quality of service (QoS) over the Internet is a very important issue and many mechanisms have already been devised or are under way towards achieving this goal. One of the most important approaches is the so‐called Differentiated Services (DiffServ) architecture, which provides a scalable mechanism for QoS support in a TCP/IP network. The main concept underlying DiffServ is the aggregation of traffic flows at an ingress (or egress) point of a network and the marking of the IP packets of each traffic flow according to several classification criteria. Diffserv is classified under two taxonomies: the absolute and the relative. In absolute DiffServ architecture, an admission control scheme is utilized to provide QoS as absolute bounds of specific QoS parameters. The relative DiffServ model offers also QoS guarantees per class but in reference to the guarantees given to the other classes defined. In this paper, relative proportional delay differentiation is achieved based on class‐based queueing (CBQ) scheduler. Specifically, the service rates allocated to the classes of a CBQ scheduler are frequently adjusted in order to obtain relative delay spacing among them. The model presented can also be exploited in order to meet absolute delay constraints in conjunction with relative delay differentiation provision. Simulation experiments verify that our model can attain relative as well as absolute delay differentiation provided that the preconditions posed are satisfied. Copyright © 2004 John Wiley & Sons, Ltd.     

PCC策略部署与应用研究

PCC是指根据用户和市场业务策略,通过GGSN侧的流量控制、差异化QoS调度等,实现移动网络资源有效、公平使用,实现数据流量的差异化、精细化经营,提高用户感知和经营收益。本文通过对GPRS网络的业务、接入、区域等不同维度的业务特征分析,针对不同的业务特点给出不同PCC策略来优化网络,推广业务,并针对未来PS域核心网的发展给出PCC的部署建议。     

Adaptive QoS Management for IEEE 802.11 Future Wireless ISPs

Wireless Internet Service Providers (WISPs) are expected to be the new generation of access providers using the emerging IEEE 802.11 technology. Face to the high competition of providing network services, the WISP have to offer the best service to the users. For this purpose, the WISP networks' managers need to provide Quality of Service (QoS) with a minimum cost in their wireless networks. The current link layer IEEE 802.11b provides fair sharing of the radio resource with no service differentiation mechanism; similarly to the Internet best effort service. However, the ongoing standard IEEE 802.11e should implement a priority mechanism at the link layer to differentiate the users' traffic. In order to overcome the lack of differentiated mechanism in the current link layer IEEE 802.11b, hence controlling the utilization of the scarce radio resource, we propose in this article to deploy Diffserv architecture coupled with an adaptive provisioning of QoS to provide better services to the users with minimum WISP cost and improve the utilization of the radio resource. Compliant with the current and future IEEE 802.11 link layer, the proposed adaptive QoS provisioning mechanism reacts to the radio resource fluctuation and improves the number of accepted clients in the IEEE 802.11 wireless cells based on the WISP business policies. The network layer differentiation provided by the Diffserv architecture intends to control the concurrent access of the traffic to the scarce radio resources at the IP layer of the mobile hosts for the uplink traffic on one hand, and at the IP layer of the base stations for the downlink traffic on the other hand.     

辽宁联通城域网QoS研究及部署

为保证IP城域网多业务承载服务质量,根据语音、视频和数据等不同业务的特性,实现QoS差异化保障,出现网络拥塞等异常情况时,可以将网络资源优先配置给高价值业务。辽宁联通从城域网网络架构、业务开展情况、等级设计、业务带宽分配以及不同设备对QoS的支持能力等方面展开了深入的分析研究,并在全省城域网部署了基于DiffServ的IP QoS技术应用。     

A novel multicast traffic engineering technique in SDN using TLBO algorithm

In recent years, multicast communication is widely used by network providers to deliver multimedia contents. Quality of service (QoS) provisioning is one of the most important issues while transmitting multimedia contents using multicast. Traditional IP multicasting techniques suffer from reliability, scalability and have limitations to provide appropriate QoS for multimedia applications based on service level agreement (SLA). Nowadays, the advent of software defined networking (SDN), enables network providers to manage their networks dynamically and guarantee QoS parameters for customers based on SLA. SDN provides capabilities to monitor network resources and allows to dynamically configure desired multicasting policies. In this paper, we proposed a novel multicasting technique to guarantee QoS for multimedia applications over SDN. To deliver multimedia contents in an efficient manner, our proposed method models multicast routing as a delay constraint least cost (DCLC) problem. As DCLC problem is NP-Complete, we proposed an approximation algorithm using teaching–learning-based optimization to solve this problem. We evaluated our proposed method under different topologies. Experimental results confirmed that our proposed method outperforms IP multicast routing protocol, and it achieves a gain of about 25% for peak signal-to-noise ratio.