Studies of Optimum Design of Multimedia Communications Systems

本项目研究了集语音、数据、视频等多媒体通信系统的性能评估，它们的最佳设计满足给定的服务等级（GOS），以及系统的技术和社会评估。（异步传输模式）用于宽带ISDN（综合业务数字网络），其中信元（分组）以突发模式从语音/视频源发起，通过使用MMPP开发了评估此类突发流量的个人性能的方法提出了一种在可延迟数据和实时交互语音/视频业务集成系统中满足个体GOS的方案，并给出了其性能评估方法。多媒体系统作为先进信息社会的基础设施发挥着重要的作用，从社会和技术的角度进行评估是必要的。信息网络相当于工业社会中汽车的高速公路，而PC和WS相当于承载多媒体内容的车辆。在这样一种计量器中，提出了多媒体通信系统的建议。

This project studied performance evaluation for multimedia communications systems integrating voice, data, video etc., their optimum design satisfying a given grade of service (GOS), and technical and social assessment of the systems.In ATM (asynchronous transfer mode) for broadband ISDN (integrated services digital networks), in which cells (packets) are originated in burst mode from voice/video sources, methods were developed to evaluate the individual performance of such bursty traffic by using MMPP (Markov modulated Poisson process) approximation.A scheme was proposed to satisfy individual GOS in the systems integrating deferrable data, and real-time interactive voice/video traffic, and their performance evaluation method was developed. A method was also studied for evaluating performance of heterogeneous bus-type CSMA/CD LAN (Ethernet), prevailing as an access network for the multimedia communications.Multimedia systems play an important roll as an infrastructure for the advanced information society, and assessment from social aspect is necessary as well as technical one. The information network is equivalent to the highway for cars in the industrial society, while PC and WS to the vehicle carrying multimedia contents. In such a meterphor, proposals were made for multimedia communications systems.