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Personal paging, communications, and locating system

  • US 5,588,009 A
  • Filed: 02/03/1994
  • Issued: 12/24/1996
  • Est. Priority Date: 02/03/1994
  • Status: Expired due to Fees
First Claim
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1. A method for transmitting a message to an individual, comprising the steps of:

  • originating said message addressed to said individual;

    transmitting the message to a central communications station;

    receiving and storing the message at said central communications station;

    creating a packet containing data from the message;

    transmitting said packet to a communications unit carried by the individual by the steps of;

    (1) computing an error checking code and adding said code to the packet;

    (2) adding a code to the packet identifying said communications unit;

    (3) transmitting the packet by means of radio to the communications unit;

    (4) receiving the packet at the communications unit;

    (5) computing an error checking code;

    (6) determining whether the packet has been correctly received by comparing the error checking code computed at the communications unit with the error checking code contained in the packet;

    (7) constructing a packet at the communications unit comprising a code identifying the communications unit;

    (8) adding a code identifying and thus acknowledging the received packet to said packet constructed at the communications unit, should the received packet contain a correct error checking code;

    (9) transmitting the packet constructed at the communications unit from the communications unit via a medium selected from the group consisting of infrared light and ultrasonic sound to one or more of a plurality of remote stations, should the received packet contain a correct error checking code;

    (10) receiving the packet constructed at the communications unit from the communications unit at a remote station and temporarily storing it;

    (11) transmitting the packet constructed at the communications unit from said remote station, by means of a communications circuit via a medium selected from the group consisting of wire and optical fiber, to said central station;

    repeating the steps of creating the packet containing data from the message and transmitting the packet to a communications unit carried by the individual, until all data in the message has been transmitted from the central station to the communications unit;

    displaying said message to the individual.

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