METHOD AND TERMINAL FOR IMPLEMENTING COMMUNICATION

Provided is a method performed by a terminal of performing communication, the method comprising receiving a call release message: generating an emergency call setup request message including a call identifier information element, IE, a caller IE and a callee IE, based on receiving a user indication to upgrade a call to emergency call, wherein the terminal is an in-progress private call state; transmitting, to other terminal, the emergency call setup request message; starting a first timer relating to private call request retransmission based on the emergency call setup request message; and entering an in-progress emergency private call state from the in-progress private call state based on the first timer relating to private call request retransmission.