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Geofence breach confidence

  • US 9,451,402 B2
  • Filed: 12/20/2012
  • Issued: 09/20/2016
  • Est. Priority Date: 05/01/2012
  • Status: Active Grant
First Claim
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1. A mobile device, comprising:

  • a set of receivers,a modem having an integrated first processor,a second processor, anda memory communicatively coupled to the modem and configured to store instructions, that when executed by the first processor, perform a process comprising;

    selecting a receiver from the set of receivers based upon a breach confidence setting;

    selecting a time interval based upon the breach confidence setting;

    identifying a component of a velocity vector in a direction of a geofence, wherein the velocity vector is a weighted sum of a set of velocity components estimated at a previous instance, the velocity vector has a direction of travel and a velocity magnitude in the direction of travel, and the component is a velocity magnitude in the direction of the geofence;

    adjusting the time interval based on the component of the velocity vector;

    obtaining location information from the selected receiver during the time interval;

    calculating a position of the mobile device using the location information;

    determining a breach of the geofence based upon the location information; and

    waking up the second processor in response to the breach of the geofence.

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