| Summary: | 碩士 === 國立暨南國際大學 === 通訊工程研究所 === 93 === With the great progress of wireless network technology, using the wireless network to surf Internet and access information has become an irresistible trend. However, among numerous wireless network technologies, IEEE 802.11 wireless local area network（WLAN）is the most favorable one, for its low construction cost, high bandwidth, and convenience to use. People can easily install and use it at home. Hence, the marketing demand for IEEE 802.11 wireless local area network has been growing bigger. According to the habits in modern life, roaming in wireless network will be indispensable. Especially, it cannot be neglected that the VoIP mobile phones will highly become an important communication tool in the future roaming service. However, the IEEE 802.11 group did not regulate the communication in between access points (AP) while the mobile station roams among them. Without common regulation, the access points of different vendors cannot exchange information. Therefore, the IEEE 802.11 group set up the 802.11f group to make a protocol to allow access points of different vendors to exchange information. The protocol is adopted by 802.11f, called IAPP, which defines the interoperation and the information exchange among access points, such that information can be transferred to the new access point during handoff, to maintain the connections stably. Therefore, we implement access points with IAPP capability, and measure the handoff time consumption about different vendor’s wireless network cards and the number of packet loss about mobile station (MS) with or without IAPP. Additionally, we apply 802.1x to secure the authentication, and observe the impact while the mobile stations roam with 802.1x enabled.
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