Method for relocating SRNS

The present invention relates to SRNS relocation (Serving Radio Network Sub-system Relocation) How to change the SRNC (Serving Radio Network Controller) for efficient use of a radio resource in an asynchronous IMT2000 system, the UMTS system. Process of SRNS relocation process of the invention, the SRNS relocation decision on a network; The process of booking the resources needed to reallocate SRNS on the network; SRNS relocation procedure after the process of the Target RNC to perform a SRNC role sends a terminal (User Equipment) and a communication is the Target RNC SRNS relocation-related RRC (Radio Resource Control) to the mobile station for the message; It characterized in that it comprises; the process of the UE transmits a RRC response message to the SRNS relocation-related Target RNC in response to this. Therefore, in accordance with the present invention, by using the encrypted (Ciphering) RRC message to solve the problems that can occur if the SRNS relocation procedure is in progress, the support successful SRNS relocation.