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Method and apparatus for reducing call setup delay

  • US 9,363,772 B2
  • Filed: 05/21/2013
  • Issued: 06/07/2016
  • Est. Priority Date: 05/21/2013
  • Status: Active Grant
First Claim
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1. A method for reducing delays in setting up a new call to a power-saving enabled subscriber device by detecting a trigger event indicating future data communications are more likely to occur, the method comprising:

  • the subscriber device operating in a low-power state in which at least one wireless link is disconnected from a wireless data network and in which the wireless link is periodically temporarily re-established to check for pending transmissions at a first reduced frequency before re-entering the disconnected state in response to finding no pending data transmissions; and

    responsive to the subscriber device detecting a trigger event indicating future data communications are more likely to occur, the trigger event being one selected from;

    (i) the subscriber device detecting that the subscriber device has entered or exited a particular incident site as defined in a geo-fence and associated with an incident occurrence, (ii) the subscriber device detected that it has been instructed to proceed to a particular geographic incident location defined at the subscriber device and associated with an incident occurrence, (iii) the subscriber device detecting a new association, or change in existing association, of the subscriber device with a particular role at a particular geographic region associated with an incident occurrence, and (iv) the subscriber device detecting a new association, or change in existing association, of the subscriber device with a particular talk group, the subscriber device transitioning the subscriber device to a higher-power state and the subscriber device transmitting data messages over the wireless link at a second increased frequency to cause the subscriber device to remain in a connected state more often compared to the low-power state.

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