面向3G通信的流媒体关键技术研究

Research on the Key Technologies of Media Streaming for 3G Networks

3G网络实时流媒体通信是一种新兴的移动增值业务,近年来对其需求日益增强,引起了学术界和工业界的广泛关注。3G流媒体开创了无线通信、互联网和视频融合的新时代。然而由于无线通信网络动态变化的信道特性、有限的带宽资源、高误码率、节点移动以及多媒体业务严格的服务质量(QoS)要求,3G流媒体业务的服务质量(QoS)保障成为一个挑战性的问题。首先对比目前几种主要的3G通信标准的技术特点;在此基础上从QoS体系、传输协议、编码技术、实时流媒体通信流特性建模等几个方面探讨面向3G通信的流媒体关键技术和研究方法;最后归纳该领域目前需要重点解决的关键问题。

As one of the novel mobile value added services,real-rime media streaming has seen increased demand on 3G networks in recent years, and has drawn tremendous attention from both academia and industry, since it is creating a new era of integration of wireless communication, the Internet and video. However, communication over wireless networks is characterized by limited bandwidth, high error rates, unstable and dynamic changes of wireless channel condilion, user mobility, channel competition, etc. These characteristics and stringent QoS requirements of multimedia apphcanons identify significant challenges for providing QoS guarantees for media streaming applications in 3G networks.This work began with a comparison of technology characteristics in 3G standards. On this basis,we explored key technologies of media streaming for 3G networks in terms of QoS system, transport protocol, video coding, and modeling on real-time video traffic. Finally, we outlined key open problems in this area.