Abstract
WLAN is a popular network technology in recent years. However, following the development of more and more WLAN related applications or services, WLAN users maybe roam between WLAN and GSM/GPRS network. Consequently, the integration between WLAN and GSM/GPRS network is an important and indispensable subject in the future. In our research, we focus on integrating the subscriber authentication scheme between WLAN and GSM/GPRS network.We will research into the subscriber authentication scheme in existing GSM/GPRS system first, including the generation procedure of subscriber authentication related information and how the information be exchanged and verified between GSM/GPRS network side and MS side. After comprehending the related subjects, we will try to establish a SIM based subscriber authentication mechanism in WLAN environment by employing the subscriber authentication scheme in existing GSM/GPRS system.We will induce some conclusion about our mechanism and some extended discussion about the subject also.