| Summary: | 碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 94 === With rapid development in Internet and multimedia, it shows the shortage of network resource, so congestion issue in computer network becomes more and more serious. For reasonable use of limit bandwidth and better provision of service, the issue of congestion control becomes research focus recently. Because real-time multimedia application requires a certain level of QoS (Quality of Service), consideration about real-time multimedia QoS transmission in existing important congestion control strategy becomes a problem worth to pay much attention. This research utilizes the feature that MPEG stream includes frames having different important level, and propose a new active congestion control strategy by improving Random Early detection (RED). Moreover, it use the strategy of single queue handling multiple priority packets to realize high quality of multimedia transmission.
In the part of demonstration, we use network simulator software NS2 and image quality score metric PSNR used by most scholar presently to prove the method proposed by this research is successful. For evaluating the effect of different parameter setting, we use factorial design to get the key elements affecting RED queue management mehod, and we use the result to depict the trend that performance affected by key factors. Network Administrtor can utilize this trend for parameter tuning purpose, and the future design about automatic parameter tuning can employ this valuable outcome.
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