Patent ID: 8902813

Claim:
A method for controlling discontinuous reception (DRX) of user equipment in a mobile communication system, the method comprising: interrupting the DRX operation when a radio resource control (RRC) connection reestablishment procedure is initiated; transmitting, by the user equipment, an RRC connection reestablishment request message to an evolved node B (ENB); receiving, by the user equipment, an RRC connection reestablishment message from the ENB; determining, by the user equipment, whether the RRC connection reestablishment message received from the ENB includes new DRX setting information; and resuming, when the received RRC connection reestablishment message contains new DRX setting information, the interrupted DRX operation according to the new DRX setting information, wherein the DRX setting information comprises at least one of a period of the DRX and a time length of a timer used for the DRX.