Design of a High Security GSM/UMTS Inter-System

GSM and UMTS mobile radio network will coexist for a few years. Security of interoperation between GSM and UMTS becomes more important. This paper proposes a high security GSM/UMTS inter-system which supports all possible network roaming and provides high security service for both GSM and UMTS subscriber. The paper discusses the architecture of proposed system and authentication procedure in different network environment. The high security GSM/UMTS is efficient in GSM and UMTS coexistence environment in future through a comparison with previous GSM/UMTS inter-system.