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System and methods for monitoring the geospatial context associated with a mobile communication device

  • US 8,532,667 B2
  • Filed: 02/29/2008
  • Issued: 09/10/2013
  • Est. Priority Date: 03/02/2007
  • Status: Expired due to Fees
First Claim
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1. A power-efficient method of assessing whether a mobile communications device is in a geospatial zone, the method comprising:

  • storing a representation of the geospatial zone in a memory of the mobile communications device, said geospatial zone being a bounded geographic region having a non-circular outer boundary;

    performing an assessment of whether the mobile communications device is in the geospatial zone, at least in part, by analyzing sensor-based location data in conjunction with the representation of the geospatial zone, wherein the assessment is performed by the mobile communications device;

    determining a border distance, the border distance being an approximate distance between the mobile communications device and the non-circular outer boundary; and

    setting a data value that controls a length of time until the mobile communications device reassesses whether it is located in the geospatial zone, the data value being based at least partially on the determined border distance;

    wherein if an assessment by the mobile communication device determines that it is within the geospatial zone, no context-change notification message is transmitted by the mobile communication device;

    wherein if an assessment by the mobile communication device determines that it is outside of the geospatial zone, a context-change notification message is transmitted by the mobile communication device; and

    wherein management of requests for communication including the mobile communication device does not require requesting a context state from the mobile communication device and is defined in terms of a transmitted mobile communication device context state.

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