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Method for continuously providing emergency call service through packet network

  • US 9,872,317 B2
  • Filed: 11/10/2014
  • Issued: 01/16/2018
  • Est. Priority Date: 11/08/2013
  • Status: Active Grant
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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