Studies of Optimum Design of Multimedia Communications Systems

研究了融合语音、数据、视频等业务的多媒体通信系统的性能评估、满足给定服务等级(GOS)的最优设计以及系统的技术和社会评估。在宽带综合业务数字网(ATM)的ATM(综合业务数字网)中，信元(分组)以突发方式从语音/视频信源发起，提出了利用MMPP(马尔可夫调制泊松过程)近似来评估这种突发业务的个体性能的方法。提出了一种在融合可传输数据和实时交互语音/视频业务的系统中满足单个GOS的方案，并给出了它们的性能评估方法。研究了作为多媒体通信接入网络的异质总线型CSMA/CD局域网(以太网)的性能评估方法。多媒体系统作为先进的信息社会的基础设施发挥着重要作用，从社会层面和技术层面进行评估是必要的。信息网络相当于工业社会中汽车的高速公路，而PC和WS则相当于承载多媒体内容的车辆。在这种情况下，人们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.