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Method for checking the compatibility of a mobile station and a functional unit; a mobile station and a functional unit

  • US 6,164,547 A
  • Filed: 12/16/1997
  • Issued: 12/26/2000
  • Est. Priority Date: 12/20/1996
  • Status: Expired due to Term
First Claim
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1. A method for checking compatibility between a mobile station and a functional unit connected to the mobile station, comprising the steps of:

  • generating, in the mobile station, a check message which comprises a code unique to the mobile station;

    transmitting the check message from the mobile station to the functional unit;

    calculating a first reference code in the mobile station based on said unique code for the mobile station and a predetermined algorithm;

    calculating a second reference code in the functional unit based on said unique code for the mobile station in the check message and said predetermined algorithm;

    generating a response message comprising the second reference code in the functional unit;

    transmitting the response message to the mobile station;

    retrieving the second reference code from the response message in the mobile station;

    comparing, in the mobile station, the first and second reference codes; and

    determining compatibility between the mobile station and the functional unit based on the comparison of the reference codes.

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