DEVICE AND METHOD FOR PROVIDING SERVICE IN MOBILE COMMUNICATION SYSTEM

摘要

A User Equipment (UE) for providing a service in a mobile communication system is provided. The UE includes a transmitter configured to transmit an attach request message to a network, upon detection of entry into an area of a non-legacy mobile communication system, and a receiver configured to receive from the network an attach accept message including information indicating whether the network supports Voice over Internet Protocol (VoIP) or Circuit Switched Fall Back (CSFB) and, if the information included in the attach accept message indicates that the network supports the VoIP or the CSFB, to receive voice service by the VoIP or the CSFB through the non-legacy mobile communication system.