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Wireless user position update using infrastructure measurements

  • US 6,166,685 A
  • Filed: 11/19/1998
  • Issued: 12/26/2000
  • Est. Priority Date: 11/19/1998
  • Status: Expired due to Term
First Claim
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1. A method for tracking a position of a mobile unit in a mobile radio communication system using information from earth-orbiting satellites and information received from infrastructure of the system, wherein the infrastructure consists of equipment associated with transmitting and receiving voice or data traffic to and from the mobile phone, comprising the steps of:

  • (A) calculating an initial position of the mobile unit using measurements from the earth-orbiting satellites;

    (B) calculating first and second range measurements using first and second signals transmitted between the mobile unit and the infrastructure;

    (C) estimating a positional difference between the initial position and a current position of the mobile station with the first and second range measurements, wherein only range measurements made from signals transmitted between the mobile unit and infrastructure are used to perform the estimating;

    (D) determining an accuracy value associated with the positional difference estimated in step (C), and comparing the accuracy value to a first threshold to determine whether the positional difference estimated in step (C) has an acceptable accuracy;

    (E) if the positional difference estimated in step (C) has an acceptable accuracy, then updating the initial position using the positional difference and repeating steps (B)-(D); and

    (F) if the positional difference estimated in step (C) does not have an acceptable accuracy, then repeating steps (A)-(D).

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