Network cell transitions for VoLTE devices at call initiation
First Claim
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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Accused Products
Abstract
Apparatus and methods of performing a network cell transition for a voice over long term evolution (VoLTE) capable mobile device. Initially, the mobile device can detect a call initiation event. Thereafter, the mobile device determines whether a radio signal power associated with its serving LTE network base station is less than a radio access technology (RAT) specific threshold (i.e., an LTE-specific threshold). In a scenario where the radio signal power is less than the RAT-specific threshold the mobile device can effectuate a transition to an available neighbor network base station employing a legacy RAT, prior to establishing a voice call. When the mobile device is in a radio resource control (RRC) connected mode the network cell transition may be associated with an induced network handover procedure. Alternatively, when the mobile device is in an RRC idle mode the network cell transition may be associated with network reselection procedure.
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Citations
15 Claims
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1. A method of causing a network cell transition for a mobile device at call initiation, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless communication device comprising:
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a radio frequency (RF) circuit; one or more processors communicatively coupled to the RF circuit; and a memory communicatively coupled to the one or more processors and storing computer-executable instructions that, when executed by the one or more processors, cause the wireless communication device, while connected to a serving base station of a Long Term Evolution (LTE) network that supports voice over LTE (VoLTE) communication, to; detect a call initiation event for a VoLTE call; measure a reference signal received power (RSRP) received from a serving base station of the LTE network; compare the measured RSRP received from 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; establish the VoLTE call via the serving base station, when the RSRP equals or exceeds the LTE RAT specific threshold; and when the RSRP received from the serving base station is less than the LTE RAT specific threshold and exceeds a RAT generic threshold; transition from the serving base station to a neighbor base station of a non-LTE legacy network; and establish a voice call associated with the call initiation event via the neighbor base station of the non-LTE legacy network. - View Dependent Claims (8, 9, 10, 11)
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12. An apparatus configurable for operation in a mobile device, the apparatus comprising:
one or more processors communicatively coupled to a memory storing instructions that when executed by the processors cause the mobile device, while connected to a serving base station of a Long Term Evolution (LTE) network that supports voice over LTE (VoLTE) communication, to perform a method comprising; 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 an LTE radio access technology (RAT) 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. - View Dependent Claims (13, 14, 15)
Specification