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中文摘要：
针对3GPP—WLAN互联网络的认证协议EAP—AKA，首先建立了3GPP—WLAN用户通过无线局域网（WLAN）实现接入的认证数学模型．通过分析指出，3GPP AAA服务器每次从认证中心获取认证矢量（AV）的数目K与重认证次数对认证信令开销所带来的影响．在考虑了重认证次数影响后，提出了一个新的自适应K选择机制，该机制利用终端在前一WLAN中总的认证次数、重认证次数和K来预测推断当前WLAN中所需的K值．仿真结果表明，新的机制相比固定的K选择机制能更有效降低由获取AV所带来的信令开销．
英文摘要：
This paper mainly focuses on the authentication protocol EAP-AKA（Extensible Authentication Protocol Method for UMTS Authentication and Key Agreement） in the integration of 3GPP（The Third Generation Partnership Project）and WLAN（Wireless Local Network）. An authentication mathematical model for 3GPP-WLAN was established. Through analyzing the authentication protocol, it is pointed out that the number K of AVs （authentication vectors） obtained from authentication center every time and the number of re authentication can affect the authentication signaling cost. A novel adaptive K select mechanism was proposed by considering the re authentication procedure. The novel scheme utilizes the terminal＇s total authentication times, the number of re authentication and the value of K in previous WLAN to infer the proper value of K in current WLAN. The simulation result shows that the new scheme can efficiently reduce the authentication signaling cost compared with the fixed K authentication mechanism.
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