Research On Security Scheme And Admission Control For WiMAX

As a highly competitive wireless access technology, WiMAX (WorldInteroperability for Microwave Access) and its marketing are concerned by manyoperators. However, as the opening nature of WMAN's transmission medium, thesecurity and admission control issues are concerned. How to provide a perfectsecurity mechanism becomes a key problem in WiMAX networking products'marketization. So the research on security mechanism and admission controlalgorithm of WiMAX network is of great significance.First of all, According to security sublayer in IEEE 802.16 standard, thesecurity mechanism of IEEE 802.16-2004 and IEEE 802.16-2005 is discussed first,the process in authentication mechanisms, key distribution, data encryption andestablish between base station and mobile station is established. The mechanism'sresponse against the classic attacks is analyzed. Then, we found that lack ofdefinition on some security problems, the vulnerability of authorization mechanismand the weak ability of the mobile terminal would bring some security problems.Secondly, on this basis, WPKI (Wireless Public Key Infrastructure) isintroduced into WiMAX, and adjustments and improvements are proposedaccordingto WiMAX's features. We propose WPKI technology for the authenticationmechanism, security mechanism based on the AES algorithm for data transmission,SSL-based secure communications between base station and mobile station. Thesecurity mechanism in WiMAX systems is improved, the performance and securityof this scheme is analyzed. The result shows that our security scheme solves somesecurity problems in WiMAX, while the ablility of mobile terminal is considered toimprove the performance.Then, the paper analyzed the definition of Access Control Mechanism forWiMAX system. Access control algorithms in traditional cellular networks and 3Gsystem is studied, the applicable conditions and the shortcomings of differentalgorithms are compared. According to the feature of WiMAX system, Access control mechanism based on the QoS priority is proposed, and the mechanism is simulated todemonstrate its effectiveness.At last, the summary of the paper is proposed, and the future work is advised.