基于FTTx网络的IPTV流量计算模型研究

文中针对电信运营商定位运维过程中IPTV业务流量瓶颈问题,结合FTTx网络组网结构、网元设备特性、IPTV业务特点、多目标求解算法等多元知识建立流量计算模型,通过IPTV业务规划流量计算研究,帮助运营商准确演算当前网络的IPTV业务升级能力。     

DOCSIS系统的业务流量及流量工程分析

随着数据、语音和视频（IPTV）业务在DOCSIS系统中融合发展．对HFC网络中不同业务流量的管理愈发显得复杂。这篇文章将讨论一些分析技巧．帮助预测将来DOCSIS网络中支持主要的流量负载和流量分配。     

IPTV的业务流量模型分析

作为一种新的多媒体业务，IPTV对带宽的消耗远远超出了传统的话音业务。研究IPTV的流量模型，对于IPTV系统的网络规划、技术的采用、网络部署具有重要的意义。     

宽带视频IPTV网络组织方案

本文件着重论述了IPTV业务的两种实现方式:1、原有网络+CDN设备,适用于IPTV业务发展初期,业务流量较小,业务分布比较集中的时期,投资小,见效快。2、在MPLSN络环境中实施视频业务:专业级视频IP承载网通过MPLS VLL／VPLS技术的QoS质量保证来提供稳定的高质量的视频业务,在需要大规模部署IPTV视频业务时,能够在整体上保证业务质量。网络覆盖面广,网络质量有保证,但投资大。文章分析了两种组网方案特点的和优势,对于当前即将铺开的IPTV建设工程具有较强的实际意义。     

IPTV承载技术探讨

从IPTV业务系统的应用特点入手,讨论了IPTV业务对承载网所提出的需求,分析和对比了IPTV内容分发网络的两种组网模式,并对现阶段开展IPTV业务的承栽网络优化改造提出了建议。     

IPTV网络测试仪中以太网控制器的设计与实现

针对IPTV网络的监测与维护,结合目前网络的快速演进,在综合考虑业务发展和运营商实际需求的基础上,设计了IPTV网络测试仪中的以太网控制器,对仪表的系统结构、以太网控制器的算法与链路层提取指标等进行了阐述,并通过FPGA对其进行仿真及验证,结果证明,此方案设计具有高度的可靠性和稳定性,在IPTV网络测试仪中得到了良好的应用。     

基于IPTV业务的FTTx网络质量提升方案研究

本文从提升IPTV业务感知出发,重点关注FTTx接入网络质量对IPTV业务的影响,通过对影响IPTV业务感知的接入网典型案例的分析,提出并制定了FTTx接入网络质量提升方案,最后通过对比分析提升方案实施前后用户万户投诉量变化情况,表明所提出的FTTx接入网络质量提升方案能够极大提升客户IPTV业务感知。     

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。     

IPTV网络测试仪中流量生成器的设计与实现

根据IPTV网络性能测试的需求,提出了基于FPGA流量生成解决方案,给出了流量设计规则和详细的流标签设计格式,结合IP报文和自定义流的格式要求,描述了自定义IP包的生成过程。为了模拟网络环境中数据流的多样性和突发性,讨论了用于流调度的GRR算法,重点分析了均匀突发流的流模式和流表设计,最后通过FPGA对系统设计进行仿真验证,结果表明设计方案稳定,在IPTV测试仪的应用中取得良好效果。     

IPTV承载技术探讨

从IPTV业务系统的应用特点入手，讨论了IPTV业务对承载网所提出的需求，分析和对比了IPTV内容分发网络的两种组网模式。并对现阶段开展IPTV业务的承栽网络优化改造提出了建议。     

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.

     

Capacity analysis of MediaGrid: a P2P IPTV platform for fiber to the node (FTTN) networks

This paper studies the conditions under which P2P sharing can increase the capacity of IPTV services over FTTN networks. For a typical FTTN network, our study shows a) P2P sharing is not beneficial when the total traffic in a local video office is low; b) P2P sharing increases the load on FTTN switches and routers in local video offices; c) P2P sharing is the most beneficial when the network bottleneck is experienced in the southbound segment of a local video office (equivalently a northbound segment of an FTTN switch); and d) sharing among all FTTN serving communities is not needed when network congestion problems are solved by using some other technologies such as program pre-caching or replication. Based on the analytical results, design for IPTV services which monitors FTTN network conditions and decides when and how to share videos among peers to maximize the service capacity. Simulations and bounds both validate the potential benefits of the MediaGrid IPTV service platform     

IPTV网络中视讯业务研究和探讨

以IPTV视讯业务为例,探讨了IPTV网络中增值业务开展的各种方式,以及在IPTV网络中应用IMS的业务实现方式,提出了全新的IPTV视频业务实现方式和业务管理方法,给出了实现宽带网络综合业务的可行方案.     

中国电信运营商发展IPTV的策略研究

作为三网融合产物的IPTV业务目前发展势头正劲。从电信运营商的角度对IPTV业务做了详细介绍,分析了IPTV对电信运营商、广电和用户三方的现实意义,介绍了目前已投入运营的IPTV的业务种类,并从政府监管、标准、内容、重叠业务、资费及安全等方面深入分析了中国IPTV市场的发展现状和瓶颈。对中国电信运营商运营IPTV业务的市场发展策略进行了探讨。     

Adaptive scheduling mechanism for IPTV over WiMAX IEEE 802.16j networks

A WiMAX technology is a very promising Broadband Wireless Access technology that is able to transmit different service types. This latter can have different constraints such as traffic rate, maximum latency, and tolerated jitter. The IEEE 802.16 Medium Access Control specifies five types of QoS classes: UGS, rtPS, ertPS, nrtPS, and BE. However, the IEEE 802.16 standard does not specify the scheduling algorithm to be used. Operators have the choice among many existing scheduling techniques. Also, they can propose their own scheduling algorithms. In this paper, we propose a scheduling strategy (Adaptive Weighted Round Robin, AWRR) for various Internet Protocol Television (IPTV) services traffic over 802.16j networks. Our scheme adapts dynamically the scheduler operation to according queue load and quality of service constraints. In particular, the proposed mechanism gives more priority to high definition television and standard definition television traffic by using two schedulers. The proposed scheduling algorithm has been simulated using the QualNet network simulator. The experimental results show that our scheduler schemes AWRR have a better performance than the traditional scheduling techniques for rtPS traffic, which allows ensuring QoS requirements for IPTV application. Copyright © 2012 John Wiley & Sons, Ltd.     

IPTV主要技术的发展趋势

快速发展的IPTV业务成为中国信息领域的一个焦点，但经过长时间在中国多个城市的试验后其业务模型依然没有完全成熟。因此如何选择合适技术的问题成为一个短时期难以回答的问题。由于目前中国已经开展试验的IPTV业务主要是对本地的小批量用户播放电视和录像节目，采用的技术只能作为一种尝试而很难成为今后IPTV技术发展的范例，因此有必要从最终构建全国性的能满足商用运营需求的IPTV业务网络的角度出发。在全国性IPTV网络架构的设计、承载网的改造、视频编码的选择、终端的结构、内容分发网络的构建、开放DRM平台的建立和媒体资产管理系统的建设等几个主要方面开展研究。     

IPTV--三网融合的开端

IPTV与目前的3个运营网（有线电视网、Internet和电信网）及其业务直接相关。但不同运营商对IPTV业务有不同定位。电信运营商认为IPTV业务体现于电视节目在IP网中的组织和传送形式，有线电视网络运营商认为IPTV业务是利用有线电视网来提供数字电视节目和电视节目以外的信息服务。由于IPTV业务分为广播业务和交互型业务两大类，支撑这两类业务的承载网也相应地分别采用单向广播网和双向交互网，因而在承载网层很难融合。融合工作将在业务层发生，即充分利用已经存在的两个承载网来经济、高效地发展业务。IPTV中既拥有广播型业务，又拥有组播型业务，还拥有交互型业务，将是三网融合的开端。     

IPTV增值业务及其实现技术探讨

本文首先介绍了什么是IPTV增值业务以及IPTV增值业务的分类,然后提出了IPTV增值业务平台的概念,对IPTV增值业务平台的结构和功能进行了描述,接着对IPTV增值业务实现中的关键技术进行探讨,最后提出了IPTV增值业务的分阶段发展建议.