Contributions To Several Issues Of Multimedia Networks Transmission Based On Discrete Event Dynamical Systems

In recent years, multimedia network communication has become an importantfield because of its combination of computer science, communications, and multimediatechniques. Researches and applications of multimedia network communication havespread into many fields, including multimedia compression, multimedia transmission,multimedia terminal design, and multimedia data storage, etc. In the evolution of nextgeneration network (NGN), the interactive multimedia network integration service hasbecome one of the most distinctive services.In this dissertation, the multimedia network system is studied by examining datatransmission, resource allocation, and stochastic stability, which includes multimedianetwork admission control, quality of service (QoS) optimization, resource overheadoptimization, and dynamic node synchronization, etc. The main contents and contribu-tions are summarized as follows:1. Given scalable video coding (SVC) and unknown arrival distribution, admissioncontrol issue is addressed within which the delay in conjunction with multiplerates is explicitly considered. Aiming to achieve the maximum aggregate QoS,a quality adaptation scheme is proposed, which optimally selects quality levelsavailable at every admitted stream. Simulation results indicate this scheme effec-tively improves performance and characterizes the in-home multimedia networksystem.2. A mathematical model for M/G/1-type queueing networks with multiple usermedia streams and limited resources is established. The goal is to develop adynamic distributed algorithm, which supports all data traffic as efficiently aspossible and makes optimally fair decisions about how to minimize the networkresource overhead. An on-line policy gradient optimization algorithm based on asingle sample path is provided to avoid suffering from a'curse of dimensionality'.The asymptotic convergence properties of this algorithm are proved. Numericalexamples provide valuable insights for bridging mathematical theory with engi-neering practice.3. Synchronization stability problems in dynamic network system with Markoviantopology switching and time-varying delays are studied. By applying Lyapunov method, robust stability criteria of network synchronization are proposed for twotime-varying delays cases. With criteria satisfied, network synchronization canbe asymptotically stable or robust stable. The theoretical work helps to providea deeper understanding of the interplay between topology and stability in multi-media communication network.Finally, a brief review of this dissertation is given, based on which some future re-search areas and open issues in discrete information space, intelligent control, resourcedynamics, and energy saving are highlighted.