Patent ID: 9655148
Date: 2017-05-16
CPC Classifications: H04W

Claim:
1. A method for performing a radio resource control (RRC) connection re-establishment by a user equipment (UE) in a wireless communication system, the method comprising: transmitting a call which is one of an emergency call or a non-emergency call; detecting an occurrence of a radio link failure (RLF); starting a timer when the occurrence of the RLF is detected, wherein the timer expires when a suitable cell or a cell using another radio access technology (RAT) is not selected within a certain time, wherein the suitable cell or the cell using another RAT is different from an acceptable cell in which the UE receives a limited service; selecting the acceptable cell while the timer is running; and performing the RRC connection re-establishment with the acceptable cell based on a type of the call and a state of the timer, wherein if the occurrence of the RLF is detected after a transmission of the emergency call, the timer stops and the RRC connection re-establishment is performed after a stop of the timer, and if the occurrence of the RLF is detected after a transmission of the non-emergency call, the timer does not stop and the RRC connection re-establishment is performed after the timer expires.