Method for continuously providing emergency call service through packet network
First Claim
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1. A method by a terminating access domain selection (T-ADS) in a wireless communication system, the method comprising:
- receiving, from a call session control function (CSCF), an invite message to make a call for a user equipment (UE);
determining whether there is an ongoing IP multimedia subsystem (IMS) voice for the UE over packet switched (PS) session; and
in case that the UE has the ongoing IMS voice over the PS session, selecting a PS domain for the ongoing IMS voice over the PS session,wherein the ongoing IMS voice over the PS session is maintained in case that the UE performs a tracking area update (TAU) procedure from a first tracking area (TA) to a second TA and IMS voice over PS sessions are not supported in the second TA.
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Abstract
A method and a device for maintaining an emergency call service through a packet network in a mobile communication network are provided. UE using VoLTE receives identification information indicating whether an IMS Voice over PS (VoPS) is supported from a network to determine whether the IMS VoPS of the network is supported, and processes paging for a CS voice call according to the determination result if the emergency call service continues through the packet network.
13 Citations
12 Claims
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1. A method by a terminating access domain selection (T-ADS) in a wireless communication system, the method comprising:
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receiving, from a call session control function (CSCF), an invite message to make a call for a user equipment (UE); determining whether there is an ongoing IP multimedia subsystem (IMS) voice for the UE over packet switched (PS) session; and in case that the UE has the ongoing IMS voice over the PS session, selecting a PS domain for the ongoing IMS voice over the PS session, wherein the ongoing IMS voice over the PS session is maintained in case that the UE performs a tracking area update (TAU) procedure from a first tracking area (TA) to a second TA and IMS voice over PS sessions are not supported in the second TA. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A terminating access domain selection (T-ADS) in a wireless communication system, the T-ADS comprising:
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a transceiver; and a controller coupled with the transceiver and configured to control to; receive, from a call session control function (CSCF), an invite message to make a call for a user equipment (UE); determine whether there is an ongoing IP multimedia subsystem (IMS) voice for the UE over packet switched (PS) session, and in case that the UE has the ongoing IMS voice over the PS session, select a PS domain for the ongoing IMS voice over the PS session, wherein the ongoing IMS voice over the PS session is maintained in case that the UE performs a tracking area update (TAU) procedure from a first tracking area (TA) to a second TA and IMS voice over PS sessions are not supported in the second TA. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification