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Fraud control for radio fleets in a land mobile radio system

  • US 5,625,870 A
  • Filed: 06/10/1994
  • Issued: 04/29/1997
  • Est. Priority Date: 06/10/1994
  • Status: Expired due to Fees
First Claim
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1. A method for preventing unauthorized use of communication equipment in a land mobile radio system which has a cell with a plurality of repeaters, each repeater having a transmitter and a receiver, the method comprising the steps of:

  • receiving at a repeater receiver in the cell a first identification code transmitted by a first radio,after receipt of said first identification code from said first radio, establishing a link between said repeater receiver and its corresponding transmitter to set up a retransmission channel,starting a timer following receipt of said first identification code from said first radio, said timer having a predetermined time-out period, andterminating said link if a second identification code is not received from said first radio before said timer completes said predetermined time-out period.

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