PREVENTING MISUSE OF A COPIED SUBSCRIBER IDENTITY IN A MOBILE COMMUNICATION SYSTEM

摘要

The invention relates to a method and an equipment of preventing the misuse of a copied subscriber identity in a mobile communication system. The use of a subscriber identity (IMSI) is restricted to predetermined terminals (MS), each having an associated equipment identity (IMEI) in such a way that: a number of allowable equipment identities (IMEI) is defined for at least one subscriber identity (IMSI), and a data base (60) linking said subscriber identities (IMSI) and the equipment identities (IMSI) allowable to them is created; the terminal (MS) sends the terminal user subscriber identity (IMSI) and its dedicated equipment identity (IMEI) to the rest of the system; the rest of the system compares whether the equipment identity (IMEI) sent is allowable to the subscriber identity (IMSI) sent; as a response to the equipment identity (IMEI) sent being allowable to the subscriber identity (IMSI) sent, the use of the terminal (MS) is permitted, and otherwise the use is denied.