基于角色的合作式IPTV运营平台——烽火网络端到端IPTV解决方案

1 基于角色的合作式IPTV运营平台 当前，通常的IPTV系统划分为4层，即业务层、内容层、承载网络层和用户层。由于流媒体业务的高带宽、实时性、互动性的特殊要求，需要部署分布式的流媒体服务网络。内容层除了要进行内容的管理和流媒体服务外，还需要包含流媒体内容分发网络CDN的功能。因此，完整的内容层包含管理、分发、服务三方面。由于各种运营商的优势侧重不同，有的擅长内容的制作和管理，有的优势在内容的分发和服务提供，未进行细分的内容层导致了双方权力的渗透和利益的交叠，不利于各自优势的发挥。     

IPTV业务端到端质量保障的探讨

IPTV是电信运营商从传统电信网络运营商向综合信息服务提供商转型的一项战略性业务,它充分体现了"Triple-Play"的优势,是三网融合的典型代表.由于IP网络是一个尽力而为(BE)的普遍服务型网络,而IPTV是一个对实时性,音视频质量要求较高的业务,因此,深入分析影响IPTV业务质量的因素并有针对性地加以解决,将有效提高IPTV业务质量,提高IPTV业务的社会认同感,有利于IPTV业务广泛开展.本文从IPTV平台、承载网络、终端等层面分析,提出了IPTV业务端到端的质量保障方案.     

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。     

IPTV端到端业务质量监测技术研究

IPTV业务的实际运营中,如何保证和监测端到端的业务质量是运营商关注的主要问题.本文首先介绍了IPTV业务质量的定义和业务质量模型,并从运营商角度提出了业务质量监测的需求.之后介绍了目前IPTV质量监测领域的技术、标准和产业发展状况,最后提出了在IPTV业务网络中部署端到端监测系统的技术方案.     

IPTV端到端组播推送网络的关键配置技术

IPTV作为一种高带宽、高质量的新型互联网多媒体业务,对电信运营商的IP城域网提出了更高要求。组播技术与传统单播技术相比,在传输效率相当的基础上具有网络带宽不随用户数量线性增长的优点,可以有效地节约视频服务器和承载网络的负载。因此,电信运营商要高效且经济地部署和实现IPTV业务,建议采用端到端组播推送,且IP组播网络的配置是关键。     

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.     

EPON系统承载IPTV业务的关键技术研究

目前固网运营商纷纷开始了IPTV业务的试验和网络部署。IPTV业务部署涉及内容分发、业务平台建设、传输和接入承载网络建设以及终端部署等多个方面。接入承载网络包含了DSL接入、LAN接入、EPON接入等多种模式,文章着重阐述了EPON接入模式下,系统承载IPTV业务的关键技术要求,包括业务隔离和VLAN规划、组播功能、端口定位与认证和业务安全等。     

上海贝尔端到端LTE解决方案

本文介绍了上海贝尔的LTE端到端解决方案,包含eUTRAN,ePC,移动网络演进传送构架(META)和业务分发环境(SDE)。阐明了上海贝尔基于统一通用平台、融合演进的eNode B对2G/3G网络的向下兼容能力;提供高效QoS保障和业务流量管理的分组演进核心;提出全新的传送网络构架来支持2G/3G和LTE网络混合传输;开放的业务开发平台支持SP快速推出业务;站在产业链的角度,协助电信运营商构建整个LTE生态系统。     

基于IP城域网承载IPTV业务的研究与实现

通过分析IPTV业务的承载需求,指出通信运营商现有的IP城域网不能满足日益增长的IPTV业务需求,IP城域网需要升级改造。分别从IPTV系统架构、业务接入设计、组播部署、IPoE部署、业务隔离、QoS部署等方面对IP城域网的接入和承载能力进行优化和改造。改造后的应用实践表明：运营商可在现有网络中有效地开展IPTV业务,并保障业务有良好的承载效果。     

三网融合下IPTV承载网络的优化及Qos策略部署

随着国家三网融合政策的出台,IPTV(交互式网络电视)作为电信运营商一项重要战略业务将显得尤为重要,IPTV承载网络质量的好坏将直接决定着IPTV业务的观看质量。文章分析了某运营商IPTV承载网络的现状,指出了存在的问题,通过对IPTV承载网络流量流向优化、组播部署及QoS(服务质量)策略部署等,对城域网IPTV承载网络进行了优化,提高了IPTV承载网络的服务质量保障能力及网络安全性,提高了用户感知,支撑了IPTV业务的发展。     

基于OSNR测量的FTTH视频业务QoS监测研究

传统的网络层中对于IPTV业务质量监测方法不能满足光接入网中的需求。因此,提出一种基于FTTH物理层光指标OSNR测量的IPTV服务质量监测的方法,通过对接入光信号OSNR的测量来监测IPTV业务的服务质量。仿真结果证明,上述方法通过监测OSNR能够IPTV接入业务的服务质量,从而提高光接入网络的运维效率,节省运维成本。     

A cognitive network management system to improve QoE in stereoscopic IPTV service

New Internet Protocol Television (IPTV) services are including new technologies such as Stereoscopic TV and three‐dimensions (3D) HDTV. As well, increased ubiquitous networking and promoting in smart devices have led to high demand IPTV (over networks). Stereoscopic content required higher data flow to support these emerging TV services, and there are higher requirements at the network layer to provide good quality of service and quality of experience to the end users in delivering stereoscopic IPTV. In this paper, we propose a new concept of cognitive network management algorithm and protocol based on 3D coding techniques for delivering of stereoscopic IPTV service. The proposed approach explains how the management algorithm observes the network performance to guarantee the quality of the stereoscopic IPTV services, by measuring the performance of quality of service (QoS) parameters (delay, jitter, and packets loss) and quality of experience (QoE) metrics such as Peak Signal‐to‐Noise Ratio (PSNR), Moving Image Videography (MIV), and Mean Opinion Score (MOS). Those parameters are monitored in order to take appropriate codification decision for IPTV service provider. Moreover, the codification decision uses K‐mean classification to select the better codification for the end users. Therefore, both kinds of 3D coding formats such as Stereo Video Coding (SVC) format and 2D + Z Coding format (2D‐plus‐Depth) are selected in our experiments. As a result, our proposal successfully ensures the appropriate quality of service and quality of experience to the end users when the service of stereoscopic IPTV is being delivered.     

IPTV技术与标准问题探讨

从“TV”的含义、“IP”承载以及“IP与TV”的关系等三个方面分析了IPTV的内涵。通过对内容制作部分、内容集成部分、内客传送部分以及IPTV终端部分的说明。探讨了IPTV体系结构的标准化问题。阐述了IPTV面临的技术挑战：缺乏良好的网络QoS保证：传统的CDN不适用于IPTV；组播技术有待进一步发展；安全以及网络改造问题。     

Quality of service management for IPTV services support in VANETs: a performance evaluation study

In order to deliver a qualitative Internet Protocol Television (IPTV) service over vehicular ad hoc networks (VANETs), a quality of service (QoS) mechanism is needed to manage the allocate of network resources to the diverse IPTV application traffic demands. Unlike other mobile network, VANETs have certain unique characteristic that presents several difficulties in providing an effective QoS. Similarly, IPTV requires a constant stream for QoS which at the moment is quite difficult due to the inherent VANET characteristics. To provide an effective QoS that will meet the IPTV application service demands, VANETs, must satisfy the compelling real-time traffic streaming QoS requirement (i.e., minimum bandwidth allocation, packet loss and jitter). In this report, we evaluate via simulation the feasibility of deploying quality IPTV services over VANETs, by characterizing the association between the IPTV streaming quality determining factors (i.e., throughput, delay, loss, jitter) and the IPTV quality degradation, with respect to node density and node velocity. Furthermore, we used an objective QoS metric (Media-Delivery-Index) to identify, locate and address the loss or out-of-order packet. We outline how, using these information’s can support in shaping network parameters to optimize service flows. The implementation assures a priority for handling IPTV traffic, such that maximise the usage of VANETs resources, and opens the possibility that loss and delay can be minimised to a degree that could guarantee quality IPTV service delivery among vehicle in a vehicular network system.

     

基于探针的端到端设备故障检测模式

随着宽带、VoIP、IPTV、大客户网络等应用的大范围普及，用户感知层面的服务保障要求越来越高。基于主动发现式网络检测，降低投诉量，帮助客户服务人员改善一次性派单成功率，集成整合现网诊断手段，智能排障，降低故障定位和解决时间。本文基于中国联通的接入网现状，以软件系统辅助探针部署的方式，探索一种有效的主动式端到端设备故障检测模式，丰富并完善运营商故障检测诊断手段。     

Improving IPTV Forwarding Mechanism in IEEE 802.16j MMR Networks Based on Aggregation

Internet protocol television (IPTV) service depends on the network quality of service (QoS) and bandwidth of the broadband service provider. IEEE 802.16j mobile multihop relay Worldwide Interoperability for Microwave Access networks have the opportunity to offer high bandwidth capacity by introducing relay stations. However, to actually satisfy QoS requirements for offering IPTV services (HDTV, SDTV, Web TV, and mobile TV) for heterogeneous users' requests, providers must use a video server for each IPTV service type, which increases the network load, especially bandwidth consumption and forwarding time. In this paper, we present a solution for forwarding IPTV video streaming to diverse subscribers via an 802.16j broadband wireless access network. In particular, we propose a new multicast tree construction and aggregation mechanism based on the unique property of prime numbers. Performance evaluation results show that the proposed scheme reduces both bandwidth consumption and forwarding time.     

Improving Delay and Jitter Performance in Wireless Mesh Networks for Mobile IPTV Services

Wireless mesh networking has recently emerged as a promising technology for the next-generation wireless networks. In wireless mesh networks (WMNs), it is practically attractive to support the low-cost quality-of-service (QoS) guaranteed mobile TV service. To meet this need, our study addresses how to improve the delay and jitter performance of mobile IPTV services over IEEE 802.11 based WMN. Particularly, we first discuss the adaptation of IEEE 802.11 MAC layer to construct a WMN with emphasis on mobile IPTV service; we then develop an enhanced version of Guaranteed-Rate (GR) packet scheduling algorithm, namely virtual reserved rate GR (VRR-GR), to further reduce the delay and suppress the jitter in multiservice network environment. Simulation results show that our proposed approach can satisfyingly prioritize mobile IPTV services in WMN, while providing non-IPTV services with what they need as well.      

基于分层聚类分析的IPTV业务质量研究与应用

IPTV是基于IP协议的视频业务,与互联网数据业务对网络质量的要求存在很多不同,对网络带宽、QoS性能、可靠性及时延性等方面都要求更高。随着IPTV业务的推广发展和用户对业务质量要求的提高,IPTV业务质量保障变得越来越重要。因此,介绍IPTV网络承载技术,分析IPTV业务质量保障现状及不足,结合SQM系统提出了一种基于分层聚类分析的IPTV业务质量优化方案。     

Discrete quality assessment in IPTV content distribution networks

Maintaining the quality of videos in resource-intensive IPTV services is challenging due to the nature of packet-based content distribution networks (CDN). Network impairments are unpredictable and highly detrimental to the quality of video content. Quality of the end user experience (QoE) has become a critical service differentiator. An efficient real-time quality assessment service in distribution networks is the foundation of service quality monitoring and management. The perceptual impact of individual impairments varies significantly and is influenced by complex impact factors. Without differentiating the impact of quality violation events to the user experience, existing assessment methodologies based on network QoS such as packet loss rate cannot provide adequate supports for the IPTV service assessment. A discrete perceptual impact evaluation quality assessment (DEQA) framework is introduced in this paper. The proposed framework enables a real-time, non-intrusive assessment service by efficiently recognising and assessing individual quality violation events in the IPTV distribution network. The discrete perceptual impacts to a media session are aggregated for the overall user level quality evaluation. With its deployment scheme the DEQA framework also facilitates efficient network diagnosis and QoE management. To realise the key assessment function of the framework and investigate the proposed advanced packet inspection mechanism, we also introduce the dedicated evaluation testbed—the LA2 system. A subjective experiment with data analysis is also presented to demonstrate the development of perceptual impact assessment functions using analytical inference, the tools of the LA2 system, subjective user tests and statistical modelling.