一個輕量化無線擷取點協定的實作

Abstract

傳統無線區域網路架構已經被廣泛的使用多年,其主要是由多功能的智慧型擷取點及第二層的網路協定交換器所構成,藉以此建構出無線區域網路的骨幹架構。然而,這種架構存在著許多的缺點,包含較高的網路管理及網路建構成本,整體性的效能低落等等。假若此傳統無線區域網路架構和IEEE 802.1x整合使用,一旦使用者在不同的擷取點之間快速的移動,那麼換手延遲的時間將無法滿足一些即時性的多媒體應用程式的需求。因此在本篇論文中,我們將建構一個以及輕量化擷取點為基礎,且為集中式管理的無線區域網路架構來改進傳架構上的缺失。另外,本文也會提出一個改良式的IEEE 802.1x 認證程序來減少換手的延遲,而實驗證實我們的方法比原有的方法要好。

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.