视频通信布局行业应用

在国外,视频电话早已不是什么新鲜的业务;在国内,QQ、MSN等即时通信工具所具有的视频聊天功能也使普通消费者对视频通信有了感性认识。虽然移动视频通信属于基础类3G业务,但在本次通信展上,视频电话的展台前观者不多,与之相对应的是其二级业务在各行各业的应用精彩纷呈。这至少说明,移动视频电话概念炒作已经过时,而视频通信的产业化应用正在布局市场。     

手机电视发展现状及障碍

移动视频，顾名思义，就是通过移动电信网络实现的，在点对点或点对多点情况下传送声音、图像、数据文件的实时性交互业务。而所谓手机电视业务，就是利用具有操作系统和视频功能的智能手机观看电视的业务，属于流媒体服务的一种。专家介绍，在未来的视频电话、视频会议、流媒体视频服务、视频信箱、视频消息等移动视频服务中，移动流媒体视频服务无疑将成为主流。     

手机电视发展现状及障碍

1我国手机电视进展情况移动视频,顾名思义,就是通过移动电信网络实现的,在点对点或点对多点情况下传送声音、图像、数据文件的实时性交互业务。而所谓手机电视业务,就是利用具有操作系统和视频功能的智能手机观看电视的业务,属于流媒体服务的一种。专家介绍,在未来的视频电话、     

VOLTE视频电话业务质量评估及指标设计

随着VoLTE网络的建设和高清视频电话的商用,如何对LTE视频通话质量进行评估成为难点。本文对VoLTE视频电话相关协议基础和背景知识进行介绍,研究影响视频通话业务的关键因素和质量评估方法,并结合信令和RTP/RTCP解码制定视频电话业务评估指标体系,应用于中国移动自动路测系统。     

NEC移动视频解决方案

移动视频业务视为第三代移动通信(3G)的一种新的杀手级应用，其主要应用可以简单分为3种。(1)信息业务：包括财经信息、新闻和体育等。(2)娱乐：包括卡通、音乐视频和电视节目的精彩片断。(3)通信：包括视频信息和视频电话／会议。     

TD-HSUPA精确选点及优化 提升TD网络上行能力

借助HSUPA技术的驱动力,TD网络上传平均速率可以从64kbit/s提升至500kbit/s,实现8倍增长。根据CSFB评测,未来几年会有70%的非话音业务ARPU来自诸如短信、EMAIL、视频电话和视频短信等P2P业务,9%的非话音ARPU来自移动业务,10%业务来自于视频业务,这些业务对于上行信道的速率提出了更高的要求。     

视频电话

目前,运营商的视频电话服务主要有两种:一种是视频会议,实现多个业务节点(一个视讯终端用户定义为一个业务节点)之间的视频会议通信,可以满足各种企事业单位和机关团体对跨地域的视频会议需求,用于远程会议、远程教学、远程医疗等应用领域,需要多点控制单元(MCU)起核心控制功能。另一种是视频电话业务,提供点对点之间的视频通信,面向广泛的企事业单位、个人提供视频通信服务。视频电话业务提供会议控制功能。蒉(摘自《通信产业报》)视频电话     

中兴推出全球首款TD-SCDMA／EDGE双模智能手机

在5G即将投入商用前夕,由全球第一阵营中兴通讯研发推出的全球首款TD-SCDMA／EDGE双模智能手机——中兴U980。其首次采用了增强型视频电话技术（EVP）,真正解决了视频通话过程中的延迟、拖影、马赛克现象,在市场上掀起一场完美的视频风暴。移动可视电话一直都被视为3G时代的一大“热门”业务,因此,移动终端的视频效果自然成为了业界普遍关注的重点。     

3G多媒体视频通信

3G的开通给宽带通信提供了一个更为广阔的空间。首先,3G的带宽已经得到了很大改善,表现优于现有的固网宽带,视频业务的发展有了更强的基础通信平台。其次,“视频电话”成为3G的基础业务之一,并且是3G重要代表业务。再次,赋予视频通信业务更多的移动特性,这将给新业务的研发与推广带入一个更为广阔的空间,也必将在此基础上催生更多新的业务应用与业务模式。     

爱立信：手机上网等三类新业务最受城市年轻人青睐

2009年12月11日,爱立信消费者研究室发布了“中国农村消费者研究报告”和“中国城市消费者研究报告”。报告显示。手机自动备份服务、音乐下载和手机上网成为对城市年轻用户最具吸引力的新服务。而大部分农村用户表示以前从来没有听说过3G,如果能够享受到3G服务,在视频电话、移动电视和移动宽带三种业务中。农村用户表示视频电话是最受他们欢迎的业务,其次为移动电视,对移动宽带则不太感兴趣。     

Voice and Internet Multimedia in UMTS Networks

Voice telephony is the predominant service on today's cellular mobile networks, in terms of number of customers, revenues and network usage. However, it is difficult to predict how long this will be the case given the rising demand for new Internet multimedia services. It is therefore essential that 3rd generation (3G) mobile networks support a voice telephony service, but also that these networks are also capable of providing Internet multimedia services using the same technology.This paper provides an overview of how voice telephony is provided in the initial phase of the universal mobile telecommunications system (UMTS). It then describes how this is expected to evolve in later phases — so that voice telephony becomes one of a large number of multimedia services provided from a common Internet protocol-based mobile network.     

Performance of Video Telephony Services in UMTS using Live Measurements and Network Emulation

While speech services in mobile communication systems are investigated quite well, video telephony services are relatively novel in this sector. Because of the market penetration of camera equipped mobile phones the video telephony service is expected to become a widely used service. In this article an introduction of the protocols used for video telephony in UMTS is given. Concepts for the performance evaluation in terms of video (PEVQ) and audio quality (PESQ) are presented and utilized. Evaluations are performed by both live measurements and network emulation. The results show that there is quite potential for improvements related to video telephony in UMTS in terms of video quality and channel setup time. Finally, an improved radio bearer configuration is provided which aims at a better integration of video telephony services into the UMTS architecture.     

UMTS-to-IP QoS mapping for voice and video telephony services

Quality of service mapping between UMTS services and IP transport is crucial for maintaining a suitable end-to-end delay for emerging UMTS multimedia telephony. However, due to incompatibilities in QoS classifications within these two technologies, straightforward mapping is impossible and current proposals within the 3GPP could lead to unpredictable and undesirable behavior for certain services. In this article we focus on two very important UMTS services, voice and video telephony, and establish the QoS issues that exist for these services. We then propose a refined QoS mapping that differentiates between the transmission of voice and video-telephony and a weighted fair queuing scheduler to schedule the transmissions. Through a simulation study, we show the effect on the queuing delays of both traffic types when their WFQ weights vary and then derive an optimal weight that provides the best overall delays for multimedia telephony services.     

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.     

The 3G-324M protocol for conversational video telephony

As mobile operators worldwide migrate to third-generation (3G) networks, conversational video-telephony services are becoming a key differentiator between new 3G offerings and existing 2G/2.5G services. Although it's possible to have limited video-based services - such as a multimedia messaging service - that deliver pictures and video clips over 2.5G services, these are delay-insensitive applications that could run over a packet-based wireless network like general packet radio service (GPRS) or code division multiple access (CDMA)'s 1XRTT. For delay-sensitive applications such as conversational video telephony, present 3G packet bearers are inadequate, and the Third Generation Partnership Project (3GPP; http://www.3gpp.org) mandates using the 3G bandwidth-guaranteed circuit-switched bearer and the 3G-324M system. The 3G-324M system is a derivative of the International Telecommunication Union (ITU) H.324 protocol standard for low-bitrate multimedia communication, which ITU-T developed for the public switched telephone network (PSTN). This article describes the 3G-324M system, which has been adopted by both 3GPP and 3GPP2 (htpp://www.3gpp2.org), as well as its H.324 roots.     

基于IMS的CDMA视频通信业务关键技术研究

IP多媒体系统（IMS,IP Multimedia Subsystem）是核心网的发展方向,视频通信（VT,Video Telephony）业务是移动网络3G时代的典型应用。针对视频通信业务需求,给出了基于IMS网络实现码分多址（CDMA,Code Division Multiple Access）网络VT业务的方法,并就业务现网实施过程中的关键问题进行了分析研究,提出了操作性较强的解决方案,为运营商部署相关业务提供了技术参考。     

Wireless video applications in 3G and beyond

This article surveys wireless video applications that have been commercialized recently or are expected to go to market in 3G (and beyond) mobile networks, mainly covering error control technologies in view of "wireless video." We introduce several related 3GPP standards including circuit-switched multimedia telephony, end-to-end packet-switched streaming, multimedia messaging service, and multimedia broadcast /multimedia service. We also review the supporting technologies for those four applications. The article concludes with a discussion of error control and rate control adaptability to network QoS variation, which is distinct from wired networks and critical to wireless networks. With respect to MBMS, we point out that required cell transmission power is crucial when realizing meaningful multicast coverage, and suggest a system that integrates different unicast and multicast networks, application-layer data repair, and transmission scheduling.     

Content and Service Protection for the Ubiquitous TV Based on Network Convergence

Today, the ubiquitous multimedia services are becoming more and more popular. However, the secure solutions that confirm the content and service security in these services are still open issues because of various network convergences and device interconnections. This paper investigates an ubiquitous multimedia service architecture and proposes a secure solution for it. In this service architecture, the multimedia content is encoded with scalable video coding and broadcasted via digital video broadcasting for handheld terminals (DVB-H) to mobile terminals, the access right is transmitted by global system for mobile (GSM/GPRS) channel, and the media content and access right can also be transferred from mobile terminals to home TV through WiFi based Wireless Local Area Network. The proposed secure solution supports three kinds of business models by using various content encryption modes and secure transmission protocols. The solution’s security is evaluated and discussed. Since few work has been done to solve this problem, the work proposed in this paper is expected to attract more researchers. Additionally, the solution is also potential for other ubiquitous services.     

Using PARLAY APIs Over a SIP System in a Distributed Service Platform for Carrier Grade Multimedia Services

The implementation of new mobile communication technologies developed in the third generation partnership project (3GPP) will allow to access the Internet not only from a PC but also via mobile phones, palmtops and other devices. New applications will emerge, combining several basic services like voice telephony, e-mail, voice over IP, mobility or web-browsing, and thus wiping out the borders between the fixed telephone network, mobile radio and the Internet. Offering those value-added services will be the key factor for success of network and service providers in an increasingly competitive market. In 3GPP's service framework the use of the Parlay APIs is proposed that allow application development by third parties in order to speed up service creation and deployment. 3GPP has also adopted SIP for session control of multimedia communications in an IP network. This article proposes a mapping of SIP functionality to Parlay services and describes a prototype implementation using the SIP Servlet API. Furthermore, an architecture of a Service Platform is presented that offers a framework for the creation, execution and management of carrier grade multimedia services in heterogeneous networks.     

The IETF Internet telephony architecture and protocols

Internet telephony was first used as a simple way to provide point-to-point voice transport between two IP hosts. However, the growing interest in providing integrated voice, data, and video services has caused its scope to be extended. Internet telephony now encompasses a range of services, including not only traditional conferencing, call control, multimedia, and mobility services, but also new ones that integrate Web, e-mail, presence, and instant messaging applications with telephony. Internet telephony and traditional circuit-switched telephony will coexist for quite some time, requiring interworking between the two. In this article we present a suite of protocols, developed in the IETF, which provide a partial solution to this complex problem