| Summary: | 博士 === 國立中央大學 === 資訊工程研究所 === 95 === In recent ten years, the communication between people are acculturated quickly. With the rapidly growth and cheaper of network bandwidth and wireless access, the communication was being moved gradually from the dedicated and expensive architecture, e.g. H323 and PSTN switch, to the common and cheaper ones, e.g. IP and VoIP. Especially, the notion of peer-to-peer(P2P) architecure was addressed and become popular in the applications of file distributions and voice communications. With the new cheaper network access and architectures, some almost-free communications between humans are available today. However, in this moment some problems were also incurred from new architectures. Since the cheaper bandwidth are shared and may be used by many applications in the same time, the quality of service for each application is not guaranteed by the service provider. Since the real-time applications could not be able over the long-delay network, it would be a challenge to such applications. Besides, the node in new P2P architecture would obtain more computing power and less bandwidth compared with the traditional PSTN switch. Hence, how to route and forward the packets from the source node to the multiple destinations would be another challenge to provide a real-time multicast services on such network. In this dissertation, the author focuses this issue that supports the real-time multicast applications over Internet. In the quality of service issue, since the bottleneck nodes are located at last-mile in most cases, we provide our solutions, postgate, LLEPS, and QGPS, to guarantee the delay and jitter for the real-time packets without ISP supports. In another issue, multicast delivery, we provide an efficient multicast algorithm which could find out a low cost distribution tree to delivery packets in an acceptable time. Based on our results, a cheap and feasible multicast real-time application should be possible over current Internet.
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