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1 引言随着多媒体技术与网络通信技术的飞速发展,多媒体通信技术得到了广泛的应用。在一个分布式系统中传输的是包含数值、文本、图形、图像、视频、音频等多种数据类型的媒体信息。多媒体通信的主要特点是实时性要求高、数据量大,尽管数字通信网络的带宽在不断地增大,但对于多媒体通信仍不能满足要求。同时还要考虑媒体的同步、传输的延迟。差错处理也是远程多媒体通信必须考虑的问题,不同的数据类型传输其QoS特性各不相同,文[4]给出了QoS基本定义及各
1 Introduction With the rapid development of multimedia technology and network communication technology, multimedia communication technology has been widely used. Transmitted in a distributed system is the value of the media, including text, graphics, images, video, audio and other data types. The main characteristic of multimedia communication is the high real-time requirement and large amount of data. Although the bandwidth of digital communication network is constantly increasing, it still can not meet the requirements for multimedia communication. At the same time also consider the media synchronization, transmission delay. Error handling is also a problem that must be considered in long-range multimedia communication. Different data types transmit different QoS characteristics, and [4] gives the basic definition of QoS and each