| Summary: | 碩士 === 銘傳大學 === 電腦與通訊工程學系碩士班 === 98 === The technology of multimedia Content Delivery Network (CDN) is to build some replica servers in the network. The origin server replicates some multimedia contents to these replica servers in order to reduce the loading of the origin server and to reduce the utilization of bandwidth. The client issues a request to the most appropriate replica server instead of the origin server, which can provide the same multimedia contents.
The main function of the request routing system in CDN is to redirect the client’s request to the most appropriate replica server. Some popular request routing algorithms include random choice, round robin, depending on bandwidth availability, depending on the loading of hard disk, and depending on the numbers of current connection. In this thesis, we use the fuzzy decision algorithm in request routing system. There are three steps in fuzzy decision algorithm, which includes fuzzification, rule evaluation, and defuzzification. Based on these three steps, we can get the fuzzy decision value. The replica server with the highest fuzzy decision value is the most appropriate replica server to serve the client’s request, then the drop rate will be decreased.
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