METHOD AND APPARATUS OF CONFIGURING DOWNLINK TIMING AND TRANSMITTING RANDOM ACCESS RESPONSE IN MOBILE COMMUNICATION SYSTEM USING CARRIER AGGREGATION

摘要

A method of configuring downlink timings and transmitting a random access response message is provided for a random access procedure in a Long Term Evolution (LTE) system supporting carrier aggregation. The method for adjusting timing of a terminal in a wireless communication system supporting carrier aggregation of at least one carrier includes transmitting a Random Access Preamble to a base station, and receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied.

主权项

1. A method for uplink timing adjustment by a base station, the method comprising:
generating a medium access control (MAC) protocol data unit (PDU) including a MAC control element (MAC CE), wherein the MAC CE includes an identity of a timing advance group (TAG) and a timing advance command (TAC) associated with the TAG; and transmitting the MAC PDU to a terminal, wherein the TAG is a group of at least one cell having same uplink timing, and wherein the identity of the TAG is set to 0 if the TAG is a primary TAG including a primary cell.