| Summary: | 碩士 === 元智大學 === 資訊工程學系 === 102 === Video on demand (VoD) service is regard as one of the most important services in next decade. VoD requires high speed and huge bandwidth to guarantee the quality of service (QoS). Ethernet passive optical network (EPON) is regarded as one of the best solutions, due to high speed and low cost. The Star-ring EPON architecture is an evolution of EPON which provide better local transmission and fault tolerance ability. The content delivery network (CDN) architecture, in which the video content is cached at a location closer to the user, is a widely used methodology to reduce the latency of VOD service. Therefore, in this paper, we proposed a mechanism which combines the advantage of Star-ring based EPON and CDN to improve QoS. We design new Sub-OLT which includes storage to store video files and serve at local. Thus, it can reduce the bandwidth between optical line terminal (OLT) and optical network unit (ONU). Simulation results have shown that our proposed mechanism can improve the system performance and quality of service in terms of packet delay, jitter, and system throughput.
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