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This dissertation, Receiver-driven Layered Multicast Over IP Networks by Hon-sun, Chiu, 邵漢新, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Receiver-driven Layered Multicast over IP Networks submitted by Chiu Hon Sun for the degree of Master of Philosophy at The University of Hong Kong in September 2004 In the presence of heterogeneity and scalability, layered multicast is the most efficient way to deliver multimedia data in the Internet. With layered multicast, a video signal is encoded into a number of layers, and each higher layer contains a refinement of the video signal transmitted in the lower layers. The receiver subscribes to as many layers as the bottleneck bandwidth permits. In this thesis, we focus on designing efficient receiver-driven layered multicast protocols. Existing layered multicast protocols are generally too complicated to be deployed in today's Internet. The original Receiver-driven Layered Multicast (RLM) protocol is simple but experiences some performance problems. In this thesis, a new protocol called Fast-response Receiver-driven Layered Multicast (FRLM) is proposed to address the above issues. By adopting the adaptive threshold design and early-trigger mechanism, FRLM allows receivers to react to congestion faster, and converge to their optimal number of subscribed layers quicker. Another common restriction of the existing layered multicast protocols is that a receiver can only subscribe from a single server. In this thesis, we extend our FRLM protocol to support multiple servers, called Fast-response Receiver-driven Layered Multicast with Multiple Servers (FRLM-MS). By intelligently connecting to a set of available servers, receivers can maximize their number of subscribed layers for better playback performance. With FRLM-MS, a receiver operates in one of three phases, start-up, cycle and recovery. We show that judiciously carrying out phase change allows the FRLM-MS to inherit all the advantages of the single server FRLM. Finally the issue of TCP-friendliness is addressed. The two existing approaches to achieve TCP-friendliness, rate-based and equation-based, are first compared and contrasted. An open-ended question is then raised: Is it necessary to make multicast multimedia transmission TCP-friendly? We investigate this question from both sides and conclude that TCP-friendliness does not deserve the attention as it is being treated nowadays. DOI: 10.5353/th_b2973585 Subjects: Multicasting (Computer networks)Multimedia systemsData transmission systems

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