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LTE user equipment positioning system and method

  • US 8,897,813 B2
  • Filed: 02/03/2012
  • Issued: 11/25/2014
  • Est. Priority Date: 02/03/2012
  • Status: Active Grant
First Claim
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1. A method of determining the location of a mobile device in a communications network having a plurality of nodes comprising the steps of:

  • (a) receiving observed positioning information for a mobile device from one or more nodes;

    (b) determining downlink transmission time of a signal from the one or more nodes as a function of the received observed positioning information;

    (c) receiving uplink positioning information from the mobile device;

    (d) determining a propagation delay between a node serving the mobile device and the mobile device as a function of the received uplink positioning information;

    (e) determining downlink timing information from the serving node as a function of the determined downlink transmission time and the determined propagation delay;

    (f) determining one or more ranges between additional nodes and the mobile device as a function of the determined downlink transmission time and the determined downlink timing information; and

    (g) determining a location of the mobile device as a function the determined one or more ranges and the determined propagation delay.

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