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Network cell transitions for VoLTE devices at call initiation

  • US 10,009,819 B2
  • Filed: 10/29/2013
  • Issued: 06/26/2018
  • Est. Priority Date: 11/02/2012
  • Status: Active Grant
First Claim
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1. A method of causing a network cell transition for a mobile device at call initiation, the method comprising:

  • by the mobile device, while connected to a serving base station of a Long Term Evolution (LTE) network that supports voice over LTE (VoLTE) communication;

    determining a radio signal power metric for the serving base station and at least one neighbor base station;

    detecting a call initiation event for a VoLTE call;

    in response to detecting the call initiation event, evaluating the radio signal power metric for the serving base station by comparing the radio signal power metric for the serving base station to an LTE radio access technology (RAT) specific threshold, wherein the LTE RAT specific threshold is greater than a RAT generic threshold associated with measurement reporting events and applicable to multiple RATs;

    when the radio signal power metric for the serving base station satisfies the LTE specific threshold, establishing the VoLTE call via the serving base station; and

    when the radio signal power metric for the serving base station does not satisfy the LTE RAT specific threshold and satisfies the RAT generic threshold;

    transitioning the mobile device from the serving base station to a neighbor base station of a non-LTE legacy network; and

    establishing a voice call associated with the call initiation event via the neighbor base station of the non-LTE legacy network.

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