×

Mobile unit tracking system

  • US 5,365,451 A
  • Filed: 03/04/1994
  • Issued: 11/15/1994
  • Est. Priority Date: 12/09/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of tracking a mobile unit, said method comprising the steps of:

  • establishing a communication link with a node of a satellite communication system comprised of a plurality of nodes having movement relative to said mobile unit;

    generating at said mobile unit, original location data, said original location data describing an original location of said mobile unit;

    sending said original location data from said mobile unit to said one node;

    first determining by said communication system, a geo-political jurisdiction in which said mobile unit resides based on said original location;

    second determining by said communication system, parameters for said communication link based on restrictions imposed by said geo-political jurisdiction, said parameters including frequency allocation, billing rates and taxes;

    calculating by said communication system, a radius determined in part by said mobile unit'"'"'s proximity to a border of said geo-political jurisdiction in which said mobile unit resides based on said original location of said mobile unit;

    receiving at said mobile unit, a data message describing said radius;

    defining by said mobile unit, an area around said original location of said mobile unit using said radius;

    third determining, by said mobile unit, when said mobile unit is outside of said area by comparing said original location to a current location of said mobile unit; and

    transmitting to said satellite communication system, from said mobile unit when said mobile unit is outside of said area, a current location data message describing said current location of said mobile unit.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×