Method for continuously providing emergency call service through packet network
First Claim
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1. A communication method for a network device that supports a packet-based voice service in a mobile communication system, comprising:
- recognizing that User Equipment (UE) is located, in a Tracking Area (TA) in which the packet-based voice service is not supported on the basis of a message that is received from a Home Subscriber Server (HSS);
if a call request message for the UE is received, determining whether a VoLTE call or an emergency call for the UE is ongoing; and
if the VoLTE call or the emergency call for the UE is ongoing, selecting a packet switched domain as a domain for the received call request message.
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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.
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Citations
16 Claims
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1. A communication method for a network device that supports a packet-based voice service in a mobile communication system, comprising:
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recognizing that User Equipment (UE) is located, in a Tracking Area (TA) in which the packet-based voice service is not supported on the basis of a message that is received from a Home Subscriber Server (HSS); if a call request message for the UE is received, determining whether a VoLTE call or an emergency call for the UE is ongoing; and if the VoLTE call or the emergency call for the UE is ongoing, selecting a packet switched domain as a domain for the received call request message. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A network device that supports a packet-based voice service in a mobile communication system, comprising:
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a transceiver; and a controller coupled with the transceiver and configured to control to;
recognize that User Equipment (UE) is located in a Tracking Area (TA) in which the packet-based voice service is not supported on the basis of a message that is received from a Home Subscriber Server (HSS), determine whether a VoLTE call or an emergency call for the UE is ongoing if a call request message for the UE is received, and select a packet switched domain as a domain for the received call request message if the VoLTE call or the emergency call for the UE is ongoing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification