IPTV QoE性能监测系统的应用和部署

首先介绍IPTV QoE的定义以及用户对业务质量的要求,然后指出为满足IPTV QoE要求TPTV运维系统应具备的能力,最后提出IPTV QoE的关键参数以及监测这些参数的监测点的部署方法.     

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。     

基于多协议层QoS参数关联的IPTV故障点定位方法

首先对IPTV马赛克、卡片等视频业务质量问题的原因进行深入分析,并与现有常用的IPTV监测方案对比,提出了一种创新的基于MPEG-TS层和RTP层QoS参数关联的IPTV业务质量分析与故障点定位方法.运维实践表明,该方法实施简便、经济有效,具有较强的推广价值.     

Zabbix在IPTV运维过程中的应用与实践

Zabbix是用于监控IT基础架构组件的可用性和性能情况的企业级软件,本文结合IPTV业务需求,简单阐述Zabbix软件的搭建过程及如何通过Zabbix软件保障IPTV业务的安全性、可靠性和持续稳定运行,实现IPTV运维工作由“发现故障—处理故障”到“预警故障—避免故障”的转变,提高运维工作质量。     

运营商三网融合接入控制方式探讨

对电信运营商而言,三网融合在接入控制层面主要是考虑怎样引入IPTV,以及如何在多业务接入模式下实现综合运营并保障各类业务的服务质量。本文通过对PPPoE的技术分析及其与IPoE的比较,讨论了通过IPoE方式提供多业务接入以满足三网融合发展的必要性和可行性,并给出了基于IPoE的综合接入控制的实现建议。     

运营商三网融合接入控制方式探讨

1前言三网融合是电信网、计算机网和有线电视网通过技术改造,能够提供包括语音、数据、图像等综合多媒体的通信业务。各大运营商目前已经能够提供VoIP语音和高速互联网数据接入,三网融合在接入控制层面主要是考虑IPTV的接入方式以及如何在多业务接入模式下实现综合运营并保障各类业务的服务质量。     

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。     

基于分布式IPTV业务质量监测方案研究

随着新一轮宽带热潮涌起,IPTV已被电信固网运营商认为是拉动ARPU的杀手锏。IPTV的发展。预示着一场新技术演变的到来,也昭示着宽带视频业务的巨大发展前景。在基于IP城域网大规模开展IPTV业务方面,由于目前缺乏有效的IPTV质量评估指标体系和故障定位手段,导致难以及时发现IP网络中潜在的拥塞、阻断、冲突等故障,因此实现对IPTV业务的“实时监测,主动运维”的目标将面临巨大的挑战。     

EPON接入技术在广电IPTV业务中的应用探讨

随着各种接入技术大力发展,广电对其传输网络也进行了一定程度的改革,单一的业务限制了广电的发展,为了改变这种现状让广电业务走向多元化,广电在IPTV业务中融入了EPON接入技术,EPON接入技术在所有接入技术中被认为是最理想的接入模式。本文针对EPON接入技术在广电IPTV业务中的应用进行探讨,从EPON的定义入手,简单的介绍EPON系统的结构组成及其关键技术,并着重探讨EPON技术在广电网络双向改造中的实际应用,促进广电服务质量的提高。     

IPTV接入网络故障处理解析

随着国内IPTV业务的快速发展,对IPTV故障的快速、高质量的处理已经成为了用户的普遍要求.而IPTV承载网接入层是整个承载网最关键的环节,负责IPTV用户的业务接入认证、面向用户组播复制、区分于宽带上网业务的QoS保证等等.如何更好更快地处理这部分故障,是影响IPTV业务质量体验的关键点.本文就是针对IPTV接入网络主要故障进行了原因判断和处理解析.     

IPTV内容分发网络端到端QoS的部署研究

IPTV内容分发网络的QoS部署控制具有很广泛的现实意义,对其部署效果进行网络监控管理,目前也有相应的新要求.本文研究了现有运营商的IPTV内容分发网络的实际情况,分析了OSI模型中网络层和数据链路层的QoS部署控制方法,结合运营商网络的骨干层、省干/城域网层、接入层和机顶盒等情况提出了保持QoS部署一致性的部署方法;同时,提出了日常保障视频QoS部署的监控模式要求,这些方法和要求很好地符合了IPTV容分发网络的保障要求,并可在目前复杂多变的网络环境中进行推广.     

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.

     

Design and analysis of a denial-of-service-resistant quality-of-service signaling protocol for MANETs

Quality-of-service (QoS) signaling protocols for mobile ad hoc networks (MANETs) are highly vulnerable to attacks. In particular, a class of denial-of-service (DoS) attacks can severely cripple network performance with relatively little effort expended by the attacker. A distributed QoS signaling protocol that is resistant to a class of DoS attacks on signaling is proposed. The signaling protocol provides QoS for real-time traffic and employs mechanisms at the medium access control (MAC) layer, which serve to avoid potential attacks on network resource usage. The key MAC layer mechanisms that provide support for the QoS signaling scheme include sensing of available bandwidth, traffic policing, and rate monitoring, all of which are performed in a distributed manner by the mobile nodes. The proposed signaling scheme achieves a compromise between signaling protocols that require the maintenance of per-flow state and those that are completely stateless. The signaling scheme scales gracefully in terms of the number of nodes and/or traffic flows in the MANET. The authors analyze the security properties of the protocol and present simulation results to demonstrate its resistance to DoS attacks.     

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。     

基于GPON的多业务承载系统研究

随着IPTV、手机电视等IP以太网基础上的多业务的需求越来越大,电信运营商面临各自的接入网在＂三网融合＂形势下的新挑战和新机遇。目前的基于铜缆宽带接入网虽然能够提供基于互联网的视频,但距离真正大规模三网融合业务的运营仍存在较大差距。通过对GPON光网络架构分析,给出了多业务承载网络的QoS功能的实现,并实现端到端QoS质量的保证,通过测试验证了方案的可行性,最后针对国内某省电信运营商GPON试点局建网分析和研究,探索出一套满足电信运营商的三网融合方案。     

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.     

家庭宽带IPTV业务开展策略

IPTV业务与互联网电视业务在业务上最大的区别是可以提供直播业务,但在系统部署方面,云管端等各部分对网络的要求均有不同.介绍了电视业务发展形态和业务平台建设模式,并从平台、CDN、城域数据网、汇聚传输、PON接入、端到端多播、端到端QoS、视频终端方面分析了运营商开展IPTV业务需要进行的网络及设备改造策略.     

QoS support for integrated services over CATV

Cable TV has emerged as a promising access network infrastructure for the delivery of voice, video, and high-speed data traffic. A central issue in the design of protocols for CATV networks is to support different levels of QoS for diverse user applications. While CATV service providers and equipment have standardized, in the so-called MCNS protocol, the basic network architecture and interfaces, issues in the MAC layer for QoS support are likely to be left for differentiation in vendor products. This article first presents an overview of the basic CATV network architectural assumptions and the set of QoS requirements for supporting integrated services over CATV. It then discusses a MAC layer scheduling protocol that can efficiently multiplex constant bit rate traffic, such as voice over IP with guaranteed delay bound, and best-effort traffic, such as data services with minimum bit rate guarantee, while achieving fairness on any excess available bandwidth. The performance of this algorithm is illustrated by simulation results using Opnet. We also discuss a dynamic polling mechanism that enhances the link utilization while preserving delay bounds for latency-critical traffic     

Efficient Radio Resource Management in Integrated WLAN/CDMA Mobile Networks

The complementary characteristics of wireless local area networks (WLANs) and wideband code division multiple access (CDMA) cellular networks make it attractive to integrate these two technologies. How to utilize the overall radio resources optimally in this heterogeneous integrated environment is a challenging issue. This paper proposes an optimal joint session admission control scheme for multimedia traffic that maximizes overall network revenue with quality of service (QoS) constraints over both WLANs and CDMA cellular networks. WLANs operate under IEEE 802.11e medium access control (MAC) protocol, which supports QoS for multimedia traffic. A cross-layer optimization approach is used in CDMA networks taking into account both physical layer linear minimum mean square error (LMMSE) receivers and network layer QoS requirements. Numerical examples illustrate that the network revenue earned in the proposed joint admission control scheme is significantly more than that when the individual networks are optimized independently.