Patent ID: 9681405
Date: 2017-06-13
CPC Classifications: H04W,Y02D

Claim:
1. A method for controlling a timing advance command by a terminal in a wireless communication system, the method comprising: receiving a system information block (SIB) including a first timing alignment timer (TAT) from a base station; receiving a radio resource control (RRC) message including a second TAT from the base station; transmitting a random access preamble to the base station; receiving a message including a timing advance command (TAC) and an identity of a timing advance group (TAG) from the base station; applying the first TAT included in the SIB to a corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in idle mode; and applying the second TAT included in the RRC message to the corresponding TAG associated with the identity of the TAG, if the random access preamble is transmitted in active mode, wherein at least one of the first TAT and the second TAT is used to control how long the terminal considers a cell belonging to the corresponding TAG to be uplink aligned.