A GSM/UMTS Selective Jamming System

This paper presents a new GSM/UMTS jamming system which is intended to be placed in a restricted area for security purpose. A pseudo base station was constructed to attempt connecting with mobile terminals. While the terminals are trying to access, the system will get the unique identity, such as IMSI and IMEI, and further check these identities in the repository. The system will selectively block the communication of these mobile terminals. We will analyze the GSM protocol which is relevant to the interception system and later present the performance of such a system by real tests and demonstrate its feasibility.