METHOD AND APPARATUS FOR TRANSMITTING DATA USING A MULTI-CARRIER IN A MOBILE COMMUNICATION SYSTEM
Transmitting data using a multi-carrier in a mobile communication system by transmitting data in user equipment of a wireless communication system using a carrier aggregation technique including setting secondary cells included in an S-TAG (Secondary-Timing Advance Group) configured of only secondary cells (SCells), deactivating a downlink timing reference cell in the S-TAG, determining whether other activated secondary cells exist besides the deactivated downlink timing reference cell in the S-TAG, and when the other activated secondary cells exist in the S-TAG, setting one of the other activated secondary cells as a new downlink timing reference cell. Accordingly, the uplink transmission speed can be increased in the user equipment and user QoS can be improved by transmitting data using one or more uplink carriers in the terminal.
1 . A data transmission method of a terminal in a wireless communication system using a carrier aggregation technology, the method comprising:
configuring secondary carriers included in a Secondary-Timing Advance Group (S-TAT) composed of Secondary Cells (SCells);
deactivating a downlink timing reference carrier (Downlink Timing Reference Cell) of the S-TAG;
determining whether the S-TAG includes other activated secondary carriers than the deactivated downlink timing reference carrier; and
configuring one of the other activated secondary carriers as new downlink timing reference carrier.
2 . The method of claim 1 , further comprising, before the configuring of the secondary carriers, receiving a control message for configuring secondary carrier included in another S-TAG than the S-TAG.
3 . The method of claim 1 , wherein the determining of whether the S-TAG includes other activated secondary carriers comprises:
determining whether other carriers activated and configured with uplink than the deactivated downlink timing reference carrier in the S-TAG;
configuring the new downlink timing reference carrier; and
configuring, when other secondary carriers activated and configured with uplink exist in the S-TAG, one of the other secondary carriers activated and configured with uplink as a new downlink timing reference carrier.
4 . The method of claim 3 , wherein the configuring of the new downlink timing reference carrier comprises configuring one of the secondary carrier having best channel state and the secondary carrier configured as pathloss reference with priority.
5 . The method of claim 1 , further comprising configuring a new Timing Advance (TA) by referencing the new downlink reference carrier and adjusting the uplink transmission timing of the S-TAG.
6 . The method of claim 5 , wherein the new TA is a value obtained by subtracting a difference between downlink frame boundaries of the deactivated downlink timing reference carrier and the new downlink timing reference carrier from the timing advance value configured by referencing the deactivated downlink timing reference carrier.
7 . A terminal transmitting data in a wireless communication system using a carrier aggregation technology, the terminal comprising:
a transceiver which transmits and receives data; and
a controller which controls configuring secondary carriers included in a Secondary-Timing Advance Group (S-TAT) composed of Secondary Cells (SCells), deactivating a downlink timing reference carrier (Downlink Timing Reference Cell) of the S-TAG, determining whether the S-TAG includes other activated secondary carriers than the deactivated downlink timing reference carrier, and configuring one of the other activated secondary carriers as new downlink timing reference carrier.
8 . The terminal of claim 7 , wherein the controller controls receiving a control message for configuring secondary carrier included in another S-TAG than the S-TAG.
9 . The terminal of claim 7 , wherein the controller controls determining, when other secondary carriers exist, whether other carriers activated and configured with uplink than the deactivated downlink timing reference carrier in the S-TAG, and configuring, when other secondary carriers activated and configured with uplink exist in the S-TAG in configuring the new downlink timing reference carrier, one of the other secondary carriers activated and configured with uplink as a new downlink timing reference carrier.
10 . The terminal of claim 9 , wherein the controller configures one of the secondary carrier having best channel state and the secondary carrier configured as pathloss reference with priority
11 . The terminal of claim 7 , wherein the controller controls configuring a new Timing Advance (TA) by referencing the new downlink reference carrier and adjusting the uplink transmission timing of the S-TAG.
12 . The terminal of claim 11 , wherein the new TA is a value obtained by subtracting a difference between downlink frame boundaries of the deactivated downlink timing reference carrier and the new downlink timing reference carrier from the timing advance value configured by referencing the deactivated downlink timing reference carrier.