Apparatus and method for establishing uplink synchronization in a wireless communication system

Abstract

Uplink synchronization establishment in a base station which operates a plurality of component carriers according to one embodiment of the present description, is performed in that the base station is connected to a user equipment, sets component carrier aggregation information, generates an uplink timing groups in the set component carrier aggregation, and transmits information on the thus-generated uplink timing groups to the user equipment.

1 . A method for establishing an uplink (UL) synchronization in a wireless communication system by an evolved NodeB (eNB), the method comprising:
 transmitting, to a User Equipment (UE), Radio Resource Control (RRC) signaling including a UL timing group information set through a primary Component Carrier (CC), the UL timing group information set comprising one or more UL timing groups, the one or more UL timing groups each comprising one or more UL CCs;   receiving a Random Access Preamble (RAP) through one or more UL CCs, each of the one or more UL CCs transmitting an RAP being set as a delegate CC in the respective UL timing group; and   transmitting a Random Access Response (RAR) including a Timing Advance (TA) value for UL CCs in the respective UL timing group,   wherein each TA value is calculated by the eNB for the respective UL timing group based on the received RAP associated with a delegate CC of the respective UL timing group, and   wherein each TA value is configured to be applied to CCs in the respective UL timing group.   
     
     
         2 - 3 . (canceled)