Method for determining uplink transmission timing of terminal having plurality of cells configured therein in wireless communication system, and apparatus using the method

1. A method for determining an uplink transmission timing of a user equipment configured with a plurality of cells in a wireless communication system, the method comprising:

receiving timing advance (TA) configuration information; and

upon reception of the TA configuration information, determining an uplink transmission time for each of two cells among the plurality of cells,

wherein the two cells are included in a group, and wherein:

i) when the two cells are a first cell using a frequency division duplex (FDD) frame structure and a second cell using a time division duplex (TDD) frame structure, and when the group includes only secondary cells, both the uplink transmission time of the first cell and the uplink transmission time of the second cell are determined by applying a same offset value regardless of the frame structures of the first cell and the second cell, and the same offset value is an offset value applied to a cell using the TDD frame structure, and

ii) when the two cells are the first cell using an FDD frame structure and the second cell using a TDD frame structure and when the group includes a primary cell, an uplink transmission time of the primary cell is determined on the basis of the TA configuration information, and both the uplink transmission time of the first cell and the uplink transmission time of the second cell are determined to be the same as the uplink transmission time of the primary cell.

2. The method of claim 1 , wherein the primary cell is a serving cell to which a physical uplink control channel (PUCCH) is transmitted.

3. The method of claim 1 , wherein both the first cell and the second cell are secondary cells.

4. A user equipment configured with a plurality of cells in a wireless communication system, the user equipment comprising:

a transceiver configured to transmit and receive a radio signal; and

a processor, operatively connected to the,

wherein the processor receives timing advance (TA) configuration information, and, upon reception of the TA configuration information, determines an uplink transmission time for each of two cells among the plurality of cells, wherein the two cells are included in a group, and wherein:

i) when the two cells are a first cell using a frequency division duplex (FDD) frame structure and a second cell using a time division duplex (TDD) frame structure and when the group includes only secondary cells, both the uplink transmission time of the first cell and the uplink transmission time of the second cell are determined by applying a same offset value regardless of the frame structure of the first cell and the second cell, and the same offset value is an offset value applied to a cell using the TDD frame structure, and

ii) when the two cells are the first cell using an FDD frame structure and the second cell using a TDD frame structure and when with the group includes a primary cell, an uplink transmission time of the primary cell is determined on the basis of the TA configuration information, and both the uplink transmission time of the first cell and the uplink transmission time of the second cell are determined to be the same as the uplink transmission timing of the primary cell.

5. The user equipment of claim 4 , wherein the primary cell is a serving cell to which a physical uplink control channel (PUCCH) is transmitted.

6. The user equipment of claim 4 , wherein both the first cell and the second cell are secondary cells.