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It is significantly noticeable within the worldwide railway industry that the current trend moves towards the use of train monitor/control systems based on wireless technologies like WiMAX. In such a wireless network, an AAA system must be set up to support security protection and QoS classification. This paper proposes a new secure AAA system developed for the WiMAX communication network testbed at Shuohuang Railway, China. This system supports network access authentication, QoS service authorization and resource usage accounting for WiMAX devices used in train control applications.
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