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Arrangement for detecting fraudulently identified mobile stations in a cellular mobile telecommunications network

  • US 5,309,501 A
  • Filed: 07/30/1993
  • Issued: 05/03/1994
  • Est. Priority Date: 11/27/1991
  • Status: Expired due to Term
First Claim
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1. In a mobile telecommunications network comprising a mobile switching center, a method of detecting fraudulently identified mobile stations, comprising:

  • in said switching center, upon receipt of a call state change message from a base station system, said message reporting a state change to a present mobile station call state that is one of a plurality of selected mobile station call states, said message comprising a mobile station identifier, accessing a previous call state recorded for a mobile station having said identifier, said selected mobile station call states each representing an operational status of a mobile station, during each call said mobile station passing through a plurality of different call states during each call; and

    responsive to accessing said previous call state, if a transition from said previous call state to said present mobile station call state is one of a predetermined set, reporting said transition.

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