Method and apparatus for transmitting data using a multi-carrier in a mobile communication system
The present invention relates to a method and apparatus for transmitting data using a multi-carrier in a mobile communication system. The method of transmitting data in user equipment of a wireless communication system using a carrier aggregation technique according to an embodiment of the present invention includes the steps of 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. According to the present invention, 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 method performed by a terminal in a wireless communication system, the method comprising:
transmitting, to a base station, a dedicated preamble or a random preamble, the random preamble being randomly selected from a preamble set;
in case that the dedicated preamble is transmitted,
receiving, from the base station, a first message including a first timing advance command (TAC), based on a cell-radio network temporary identifier (C-RNTI), and
applying the first TAC to adjust uplink timing between the terminal and the base station; and
in case that the random preamble is transmitted,
receiving, from the base station, second message including a second TAC and an uplink grant, based on a random access-radio network temporary identifier (RA-RNTI),
applying the second TAC to adjust the uplink timing between the terminal and the base station, and
performing uplink transmission based on the uplink grant,
wherein the first message includes the first TAC with a first size between the first size and a second size in case that the dedicated preamble is transmitted,
wherein the second message includes the second TAC with the second size between the first size and the second size in case that the random preamble is transmitted, and
wherein the first size is smaller than the second size, and the first size is 6 bits.
2. The method of claim 1 , wherein the dedicated preamble is transmitted on a secondary cell (SCell), and the random preamble is transmitted on a primary cell (PCell).
3. The method of claim 1 , wherein the first TAC indicates advancing or delaying the uplink timing based on current uplink timing.
4. The method of claim 1 , wherein the second TAC indicates an amount for alignment of the uplink timing.
5. A method performed by a base station in a wireless communication system, the method comprising:
receiving, from a terminal, a dedicated preamble or a random preamble, the random preamble being randomly selected from a preamble set;
in case that the dedicated preamble is received, transmitting, to the terminal, a first message including a first timing advance command (TAC), based on a cell-radio network temporary identifier (C-RNTI); and
in case that the random preamble is received, transmitting, to the terminal, a second message including a second TAC and an uplink grant, based on a random access-radio network temporary identifier (RA-RNTI),
wherein the first TAC is applied to adjust uplink timing between the terminal and the base station in case that the dedicated preamble is received,
wherein the second TAC is applied to adjust the uplink timing between the terminal and the base station and uplink transmission is performed based on the uplink grant in case that the random preamble is received,
wherein the first message includes the first TAC with a first size between the first size and a second size in case that the dedicated preamble is received,
wherein the second message includes the second TAC with the second size between the first size and the second size in case that the random preamble is transmitted, and
wherein the first size is smaller than the second size and the first size is 6 bits.
6. The method of claim 5 , wherein the dedicated preamble is transmitted on a secondary cell (SCell), and the random preamble is transmitted on a primary cell (PCell).
7. The method of claim 5 , wherein the first TAC indicates advancing or delaying the uplink timing based on current uplink timing.
8. The method of claim 5 , wherein the second TAC indicates an amount for alignment of the uplink timing.
9. A terminal in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to control to:
transmit, to a base station, a dedicated preamble or a random preamble, the random preamble being randomly selected from a preamble set,
in case that the dedicated preamble is transmitted,
receive, from the base station, a first message including a first timing advance command (TAC), based on a cell-radio network temporary identifier (C-RNTI), and
apply the first TAC to adjust uplink timing between the terminal and the base station, and
in case that the random preamble is transmitted,
receive, from the base station, a second message including a second TAC and an uplink grant, based on a random access-radio network temporary identifier (RA-RNTI),
apply the second TAC to adjust the uplink timing between the terminal and the base station, and
perform uplink transmission based on the uplink grant,
wherein the first message includes the first TAC with a first size between the first size and a second size in case that the dedicated preamble is transmitted,
wherein the second message includes the second TAC with the second size between the first size and the second size in case that the random preamble is transmitted, and
wherein the first size is smaller than the second size and the first size is 6 bits.
10. The terminal of claim 9 , wherein the dedicated preamble is transmitted on a secondary cell (SCell), and the random preamble is transmitted on a primary cell (PCell).
11. The terminal of claim 9 , wherein the first TAC indicates advancing or delaying the uplink timing based on current uplink timing.
12. The terminal of claim 9 , wherein the second TAC indicates an amount for alignment of the uplink timing.
13. A base station in a wireless communication system, the base station comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to control to:
receive, from a terminal, a dedicated preamble or a random preamble, the random preamble being randomly selected from a preamble set,
in case that the dedicated preamble is received,
transmit, to the terminal, a first message including a first timing advance command (TAC), based on a cell-radio network temporary identifier (C-RNTI), and
in case that the random preamble is received,
transmit, to the terminal, a second message including a second TAC and an uplink grant, based on a random access-radio network temporary identifier (RA-RNTI),
wherein the first TAC is applied to adjust uplink timing between the terminal and the base station in case that the dedicated preamble is received,
wherein the second TAC is applied to adjust the uplink timing between the terminal and the base station and uplink transmission is performed based on the uplink grant in case that the random preamble is received,
wherein the first message includes the first TAC with a first size between the first size and a second size in case that the dedicated preamble is received,
wherein the second message includes the second TAC with the second size between the first size and the second size in case that the random preamble is transmitted, and
wherein the first size is smaller than the second size and the first size is 6 bits.
14. The base station of claim 13 , wherein the dedicated preamble is transmitted on a secondary cell (SCell), and the random preamble is transmitted on a primary cell (PCell).
15. The base station of claim 13 , wherein the first TAC indicates advancing or delaying the uplink timing based on current uplink timing.
16. The base station of claim 13 , wherein the second TAC indicates an amount for alignment of the uplink timing.