This paper first introduced the standard of HiperLAN/2 and the architecture of GPRS/UMTS networks
then discussed the interworking architecture between HiperLAN/2 and GPRS/UMTS. There are twofundamentally different ways of solving the interworking: loose interworking and tight interworking.Loose interworking have less impact on GPRS/UMTS networks
so the paper focus on the discussionof the security