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Multi-channel cellular communications intercept system

  • US 5,428,667 A
  • Filed: 03/11/1993
  • Issued: 06/27/1995
  • Est. Priority Date: 03/11/1993
  • Status: Expired due to Term
First Claim
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1. A cellular communications intercept system for intercepting cellular telephone communications on a cellular network between a base station and a target mobile unit, wherein the cellular network includes a plurality of cells with each cell having a base station, wherein all mobile units communicate with the base station on an assigned voice channel, and wherein each mobile unit has a preassigned unique identification number, and wherein a global page on a forward control channel from each base station to all mobile units in the cellular network includes the identification number of the called mobile unit, and wherein a base station page on the forward control channel of the base station for the cell in which the called mobile unit is located identifies the voice channel for the called mobile unit, said cellular communications intercept system comprising:

  • a plurality of tunable receivers, wherein each receiver is tuned to the forward control channel of one base station for receiving the base station pages and the global pages transmitted on that forward control channel;

    wherein each of said plurality of receivers includes decoder means responsive to each received global page for extracting therefrom the identification number of the called mobile unit;

    wherein each of said decoder means is responsive to each base station page for extracting therefrom the voice channel assignment for the call to the mobile unit;

    storage means for storing target mobile unit identification numbers;

    comparator means responsive to the identification number of the called mobile unit and responsive to the stored target mobile unit identification numbers and for producing a match signal when the identification number of a called mobile unit matches one of the stored target mobile unit identification numbers;

    controller means for controlling said plurality of receivers and responsive to said match signal and said voice channel assignment;

    wherein one receiver of the plurality of receivers is designated as the primary receiver for at least one predetermined target mobile unit, and wherein the controller means, in response to the match signal, commands said identified receiver to tune to the assigned voice channel for said at least one predetermined target mobile unit, such that voice communications for said at least one predetermined target mobile unit are received by said identified receiver; and

    a monitoring station connected to each one of the plurality of receivers for monitoring all communications intercepted by said connected receiver.

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