Papanikolaou, Aikaterini; (2001) Server and Management System Design for a Distributed VoD Service. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

In this thesis a study on the design and performance of a distributed VoD service is presented. In the first chapter a general introduction to the thesis is provided. In the second chapter we provide a review to the enabling technologies for multimedia services and specifically for VoD. We review network, transport and delivery standards. In the third chapter we present an overview of the most important VoD trials and an analysis on the composing components of the VoD service. In the fourth chapter we present VoD service designs from the bibliography, that support and promote the idea a distributed service provision system. In the fifth chapter we present our design for a VoD server, supporting mass and interactive user connections, based on a two-tier control system. The first tier is based on staggered multicast at very short time intervals and processes normal connection flow and the second tier, provides the control for the user defined actions. In the sixth chapter we present our design for the VoD server management system. Our system is a heuristics based one, it uses as little network status information as possible and makes decisions based on the current popularity rates it is receiving from the network. The movies are separated into classes depending on popularity and treated accordingly. In the seventh chapter we present the simulation network we used in our study. The servers are placed in a regular square grid network, the movie library size is standard and the server capacity is varied. In the eighth chapter we present the results we obtained using our simulation framework and applying different system and control parameters. In the ninth chapter we compare our results of the distributed system to a centralised system and to a system of non-networked independent servers. In the last chapter the general conclusions are drawn.

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