| Summary: | 碩士 === 國立交通大學 === 電機資訊學院碩士在職專班 === 93 === In the current networking environment, TCP/IP is the most popular transmission method for data communication. However, there exist different TCP versions on the Internet. Besides TCP, many other control protocols whose characteristics are not like TCP are called TCP Unfriendly Flow in general, such as UDP (User Datagram Protocol). This thesis mainly focuses on fairness problem between the frequently used TCP versions, Reno and Vegas. By adjusting buffer size dynamically according to the active flow number, our method uses the active queue management scheme, RED (Random Early Detection), to fairly allocate the bottleneck bandwidth. WFQ (Weighted Fair Queuing) is also used to allocate bandwidth by the ratio of TCP and UDP flows when considering their coexistence on the Internet. The primary propose of the thesis is to solve the fairness problem by adjusting RED buffer size and to control the bandwidth allocation between TCP and UDP by deploying WFQ.
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