NGN中的移动多媒体业务平台

IP多媒体子系统作为下一代网络的重要平台实现了固定网络与移动网络的无缝业务传递,丰富了移动多媒体的各种增值业务.IP多媒体子系统具有控制功能与承载能力分离、呼叫与会晤分离、应用与服务分离、业务与网络分离、移动网与互联网业务融合的主要特征,既适用于基于IP的移动多媒体业务,也适用于传统语音、数据和视频业务,是未来移动多媒体业务的发展方向.     

读书时间

《3G与固定视频业务的融合》书号:13419作者:梅玉平等定价:29元系统介绍了第三代移动通信网和固定网的视频通信业务和技术体系。提供了WCDMA网络与H.323、softswitch网络进行视频互通试验的研究成果,研究了视频互通网关的关键设备,分析了典型的视频网关解决方案,探讨了移动和固定视频通信的融合、多媒体视频编码的最新技术、DVB—H移     

信息窗

思科在爱尔兰首推三网合一宽带服务——爱尔兰最大ISP借助思科IP下一代网络实现IPTV和实时多媒体业务思科系统公司近日宣布,爱尔兰最大的私营互联网接入服务提供商(ISP)之一,Digiweb有限公司将在思科系统公司的IP下一代网络技术基础上构建一个全国性的网络,为全国80%的民众提供融合式数据、语音和视频(“三网合一”)服务。思科IP多协议标签交换(IP/MPLS)骨干网将提供Digiweb所需的高性能智能传输,以便Digiweb能利用其“最后一里”的无线网络接入,向家庭和企业提供基于IP的数字化视频和多媒体服务。此无线宽带网将直接为爱尔兰主…     

宽带多媒体应用的新动向

１概述在信息技术高速发展的今天 ,社会对图像、音频、视频等多媒体信息的需求量急剧上升。在保证质量及可靠性的前提下 ,如何向用户提供高速宽带的多媒体业务已经成为ＩＴ企业及网络运营商的主要目标。数字技术及光纤的发展 ,为多种业务的融合及宽带多媒体业务提供了必要的技术保障。近几年来 ,Ｉｎｔｅｒｎｅｔ迅猛发展 ,统一的ＴＣＰ／ＩＰ协议 ,使得不同网上的数据、文本、图形、图像、语音可以实现互通。Ｉｎｔｅｒｎｅｔ带来了一场革命，推动了音频、视频、数据业务的融合 ,也使电话网、计算机网、有线电视网的“三网合一”成为时代发…     

发展现有网络以提供多媒体业务

“多媒体”是指服务于专用网和商用网的话音、静止或活动图像、以及数据的同步传输。一个可支持所有这些多媒体业务的网络称为全业务网络。今天,技术的进步将推动现有电信业的蓬勃发展,现有网络演进为全面业务网络已成为现实。计算机业、娱乐业以及图像处理的融合对未来的电信工业将会产生革命性的变革。 多媒体业务 多媒体的应用分为专用或商用。专用包括娱乐——即先     

IMS网络中IP化建设和规划的研究

3GPP IMS标准定义了一个新的网络域——IMS域,专门用来控制和集成多媒体业务,是解决移动固网融合,引入语音、数据、视频三重融合等差异化业务的首要方式.而IMS网络的IP化是其最显著的特点.本文就IP技术在IMS网络中的应用进行了详细的讨论.     

浅述IMS技术的发展应用路径

IMS技术作为一类全新的IP多媒体业务子系统,是多媒体系统的衍生,不仅能够满足当前多样化终端用户对于多媒体业务的各类需求,同时也能为移动通信技术的更新以及互联网业务的发展提供广阔的渠道。就目前来讲,IMS已经被公认为下一代网络的核心关键技术,通过有效应用可以解决视频融合、数据分析以及语音测试等多媒体功能,提升工作效率。基于此,主要研究IMS技术的发展应用路径及前景。     

NGN在大客户市场发展探讨

NGN下一代融合网．目前无一个统一定义。中国电信集团韦乐平认为：广义上，NGN泛指不同于目前一代，大最采用新技术，以IP为中心，同时支持语音、数据和多媒体业务的融合网络。狭义NGN指以软交换为控制屡，兼容三网的开放体系架构．从业务上看支持语音、视频和多媒体业务；NGN指下一代业务网，对电话网而言，指软交换体系；     

聚焦视频交互式多媒体业务：视频交互式多媒体业务研究进展

随着互联网和移动通信网的逐渐普及,视频交互式多媒体业务迅速发展,带来了庞大的市场和产业价值,成为未来通信业务新的增长点。本文首先介绍了国内外视频交互式多媒体业务的开展情况,然后,从共性技术、基础标准．系统标准和系统平台四个方面详细介绍了视频交互式多媒体业务的技术体系。近年来视频交互式多媒体业务技术变化日新月异,新技术层出不穷,极大地提高了业务的服务质量。本文最后着重介绍了视频交互式多媒体业务中的虚拟现实技术、视频转码技术、多媒体检索技术及最新技术进展及其给视频交互式多媒体业务所带来的变化。     

基于LTE的宽带多媒体集群技术在公安警务中的应用与发展

相对于传统窄带集群通信技术,基于LTE的宽带多媒体集群系统可以提供更大的无线传输带宽,能够实现无线高清视频监控、视频对讲、视频调度等宽带多媒体业务,可广泛应用于公安业务。文章介绍了基于LTE的宽带多媒体集群系统的架构及其在公安业务领域的典型应用,并且结合公安行业的实际情况,将窄带集群通信与宽带多媒体通信进行有效融合,可实现警用集群通信从窄带网络到宽带网络的平滑演进。     

Securing multimedia services over satellite ATM networks

In recent years there has been increasing interest in interconnecting satellite and ATM networks, because both share common characteristics of the ability to provide bandwidth-on-demand and flexibility of integrating voice, video and data services. There are several new satellite constellation proposals that support multimedia service and transport ATM traffic. For a successful implementation of such systems it is essential to address the security requirements of users, satellite ATM network operators and multimedia service providers. In order to minimize delay and the cost of implementing security systems for satellite ATM networks, the network operator role (in security services) can be limited to the mutual authentication with satellite users during call set-up periods. In this paper a mutual authentication protocol between the user and the satellite network is presented using digital signature and public key systems. Also, another mutual authentication protocol between the user and the service provider is presented to provide end-to-end authentication and negotiation of security options such as selecting a secret key system and the key length. Finally, a detailed hardware implementation of ATM cell payload encryption is presented using the DES/TripleDES secret key system. © 1998 John Wiley & Sons, Ltd.     

用于电视台的多媒体关键技术及其发展概况

本文从电视中心设备及其系统的角度，探讨了用于电视台的多媒体关键技术及其发展概况，主要包括多媒体通信，分布式多媒体网络，视频服务器，多媒体技术中的编码和处理以及多媒体信息管理与多媒体数据库等。     

福建省宽带多媒体通信网集成方案

本文主要介绍福建省宽带多媒体通信网络拓扑结构和业务集成方案。宽带多媒体通信网包括ＡＤＳＬ接入网、ＡＴＭ宽带交换网,应用服务器。目前在福建省宽带多媒体通信网上承载的业务有视频点播和宽带ＷＥＢ浏览、１６９／１６３的传输和路由骨干,帧中继,交互式视频业务（如电视会议,远程医疗）等。     

QoS‐aware routing and power control algorithm for multimedia service over multi‐hop mobile ad hoc network

This paper presents a QoS (quality of service) aware routing and power control algorithm consuming low transmission power for multimedia service over mobile ad hoc network. Generally, multimedia services need stringent QoS over the network. However, it is not easy to guarantee the QoS over mobile ad hoc network since its network resources are very limited and time‐varying. Furthermore, only a limited amount of power is available at mobile nodes, which makes the problem more challenging. We propose an effective routing and power control algorithm for multimedia services that satisfies end‐to‐end delay constraint with low transmission power consumption. The proposed algorithm supports the required bandwidth by controlling each link channel quality over route in a tolerable range. In addition, a simple but effective route maintenance mechanism is implemented to avoid link failures that may significantly degrade streaming video quality. Finally, performance comparison with existing algorithms is presented in respect to traditional routing performance metrics, and an achievable video quality comparison is provided to demonstrate the superiority of the proposed algorithm for multimedia services over mobile ad hoc network. Copyright © 2010 John Wiley & Sons, Ltd.     

浅谈IP多媒体子系统业务平台

文章研究了3GPP在UMTSRel5、Rel6演进版本中提出的IP多媒体子系统(IMS),描述了IMS在基于分组域上提供电话和非电话业务的系统架构。IMS的提出对固网和移动网络的融合起到了很大的推动作用,研究基于IMS的统一业务平台对下一代业务平台体系架构具有一定参考意义。     

基于三网融合业务的多SSID WiFi家庭多媒体终端的研究和应用

广东广电网络在三网融合的背景下推出满足用户视音频和宽带上网等需求、支持第三方网络运营商接入和三屏互动业务的家庭多媒体终端解决方案。该方案为全国各地广电的运营和盈利模式提供了具有参考价值的技术要求和实践依据,为广电行业应对三网融合提供了新思路和新手段。     

多媒体视频质量测量的研究和标准化

多媒体视频是电信运营商的重要业务,如何准确地测量多媒体视频质量,反馈给运营商,更好的监测管理,提升客户体验,至关重要.本文将从多媒体视频质量测量的应用需求、主观评价方法、客观测量方法、标准化等几个方面展开研究,重点分析视频视觉质量(PVQ)测量技术,其中无参考测量技术是目前国际研究和标准化的重点.在PVQ测量的基础上,...     

Design of a Link Control Protocol for Multimedia Services in Wireless Local Communication

The convergence of wireless systems with multimedia services is the challengeof future generation wireless networks. The large variety of QoS requirementsof different media as well as the maintenance of synchronization of thedifferent streams to be presented at receiver, demand from the Data link layersome extra functionalities. In this paper, we present an enhanced approach forthe efficient management of multimedia applications in third-generationwireless networks. We advocate the use of multiple connections, one for eachtraffic component of the application, as the effective solution for thetransport of multimedia applications in future-generation wireless networks.The effectiveness of this scheme is guaranteed by providing a new link controltechnique that works on top of a PRMA-type access protocol which jointlymanages different streams of a multimedia application. For this purpose, wepropose a two-level priority mechanism (static and dynamic priorities)specified by higher protocol layers for link activation, channel access, andadmission control procedures specific to a multimedia application and foroptimizing the sharing of radio channel resources and management of thereservation queue at the base station. We expect this priority-based mechanismto perform well, especially during periods in which system traffic load ishigh, and to react well to the deterioration of multimedia service quality,in terms of both QoS parameters and the synchronization of its trafficcomponents.     

Modeling and Analysis of Broadband Cellular Networks with Multimedia Connections

As mobile networking is moving towards the direction of providing high-speed multimedia services, the presence of connections that do not generate traffic at constant rate is becoming reality in wireless environment. For preliminary network design purposes analytical models are necessary that examine the performance or wireless networks with such connections. In this paper an analytical method is presented to calculate call-level system parameters of cellular networks with multimedia connections. The method is based on an approximate recursive calculation. The accuracy of the approximation is verified by computer simulations. The derivation of the distributions of user describing time variables and two simple admission control policies are also presented and investigated.