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Switching a call from a network assisted communication mode to a direct communication mode

  • US 7,164,930 B2
  • Filed: 12/31/2004
  • Issued: 01/16/2007
  • Est. Priority Date: 12/31/2004
  • Status: Active Grant
First Claim
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1. A method for changing a call from a network facilitated calling mode to a direct calling mode, comprising:

  • establishing a call between a first mobile communication device and a second mobile communication device via a communications network, the first and second mobile communication devices communicating with the communications network using a first wireless communications protocol in a first communications frequency band;

    determining that the first and second mobile communication devices are within sufficient radio proximity to allow the direct calling mode to commence; and

    commencing the call using the direct communication mode where the first and second mobile communication devices communicate directly with each other using a second wireless communications protocol in a second communications frequency band;

    wherein determining that the first and second mobile communication devices are within sufficient radio proximity is performed by the communications network comparing a timing advance index number of the first mobile communication device with a timing advance index number of the second mobile communication device when the first and second mobile communication devices are within the same communication cell.

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