Preventing misuse of a copied subscriber identity in a mobile communication system

  • US 6,427,073 B1
  • Filed: 03/16/1999
  • Issued: 07/30/2002
  • Est. Priority Date: 09/17/1996
  • Status: Expired due to Term
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First Claim
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1. A method of preventing the use of a copied subscriber identity in a telecommunication system comprising at least one controller, several subscriber identities and several terminals, each terminal having an associated equipment identity, the method comprising:

  • maintaining a set of protected subscriber identities and defining a set of allowable equipment identities for each protected subscriber identity;

    sending from a terminal to the controller equipment identity and subscriber identity associated with the terminal;

    checking by a controller if the subscriber identity sent is a protected subscriber identity, and if it is, the controller comparing whether the equipment identity sent is allowable to the subscriber identity sent; and

    denying by the controller the use of the terminal if the equipment identity sent is not allowable to the subscriber identity sent.

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