| Summary: | 碩士 === 國立交通大學 === 資訊科學系所 === 92 === Traditional WLAN architecture has been used for several years. It consists of intelligent access point and layer 2 switch and uses as a WLAN backbone infrastructure. However, it has many drawbacks such as high overhead of network management, high construction cost and low performance. Once traditional WLAN architecture works together with the IEEE 802.1x mechanism and the mobile host moves between different access points quickly, the handoff delay will not meet the requirement of real-time multimedia application. In this thesis, we will construct a centralized WLAN architecture based on the Thin AP architecture to improve the weak points of the traditional WLAN architecture. A modified IEEE 802.1x authentication procedure is also presented to decrease the handoff delay, and the experiment shows that the novel mechanism is better than the original one.
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