Studies of Optimum Design of Multimedia Communications Systems

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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.