Method for transmitting/receiving data in wireless communication system and base station for same

1. A method of transmitting data by a user equipment in a time division duplex (TDD) wireless communication system supporting multiple cells, the user equipment being configured with a plurality of cells including a first cell and a second cell, the method comprising:

receiving resource allocation information including a flag value indicating uplink resource allocation information via a physical downlink control channel (PDCCH) from a base station, when performing cross cell scheduling for the second cell via the first cell according to an uplink-downlink configuration of the first cell;

determining that the resource allocation information is downlink resource allocation information, when the resource allocation information is received at a subframe timing for which an uplink transmission timing is not defined based on an uplink-downlink configuration of the second cell;

receiving the uplink resource allocation information from the base station via a physical downlink shared channel (PDSCH) of the second cell according to the downlink resource allocation information; and

transmitting uplink data to the base station via a physical uplink shared channel (PUSCH) of the second cell according to the uplink resource allocation information,

wherein when the uplink resource allocation information is transmitted together with downlink data, the uplink resource allocation information is joint-coded with the downlink data, and

wherein a modulation and coding scheme (MCS) level used for the joint coding is identical to a MCS level used when the uplink resource allocation information is not transmitted via the PDSCH.

2. The method of claim 1 , wherein a subframe in which the PDSCH is received on the second cell corresponds to a subframe which is first available after a subframe in which the PDCCH is received.

3. The method of claim 1 , wherein the MCS level used for the joint coding is determined to be a value for identically maintaining the number of resource used when the uplink resource allocation information is not transmitted via the PDSCH.

4. The method of claim 1 , wherein the MCS level used for the joint coding is identical to a MCS level used for PDCCH of a subframe in which the PDSCH is transmitted.

5. The method of claim 1 , wherein the MCS level used for the joint coding is identical to a MCS level used for a most recently transmitted PDCCH before the PDSCH is transmitted.

6. The method of claim 1 , wherein the MCS level used for the joint coding is identical to a MCS level used for most recently transmitted uplink resource allocation information before the PDSCH is transmitted.

7. The method of claim 1 , wherein the number of resource or a position of a resource region to which the uplink resource allocation information is mapped is predetermined or is configured by a higher layer signaling.

8. A user equipment configured to transmit data in a wireless communication system supporting multiple cells, the user equipment being configured with a plurality of cells including a first cell and a second cell, and comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal; and

a processor configured to:

receive resource allocation information including a flag value indicating uplink resource allocation information via a physical downlink control channel (PDCCH) from a base station, when cross cell scheduling for the second cell via the first cell according to an uplink-downlink configuration of the first cell is configured for the user equipment,

determine that the resource allocation information is downlink resource allocation information, when the resource allocation information is received at a subframe timing for which an uplink transmission timing is not defined based on an uplink-downlink configuration of the second cell,

receive the uplink resource allocation information from the base station via a physical downlink shared channel (PDSCH) of the second cell according to the downlink resource allocation information, and

transmit uplink data to the base station via a physical uplink shared channel (PUSCH) of the second cell according to the uplink resource allocation information,

wherein when the uplink resource allocation information is transmitted together with downlink data, the uplink resource allocation information is joint-coded with the downlink data, and

wherein a modulation and coding scheme (MCS) level used for the joint coding is identical to a MCS level used when the uplink resource allocation information is not transmitted via the PDSCH.

9. The user equipment of claim 8 , wherein a subframe in which the PDSCH is received on the second cell corresponds to a subframe which is first available after a subframe in which the PDCCH is received.

10. The user equipment of claim 8 , wherein the MCS level used for the joint coding is determined to be a value for identically maintaining the number of resource used when the uplink resource allocation information is not transmitted via the PDSCH.

11. The user equipment of claim 8 , wherein the MCS level used for the joint coding is identical to a MCS level used for PDCCH of a subframe in which the PDSCH is transmitted.

12. The user equipment of claim 8 , wherein the MCS level used for the joint coding is identical to a MCS level used for a most recently transmitted PDCCH before the PDSCH is transmitted.

13. The user equipment of claim 8 , wherein the MCS level used for the joint coding is identical to a MCS level used for most recently transmitted uplink resource allocation information before the PDSCH is transmitted.

14. The user equipment of claim 8 , wherein the number of resource or a position of a resource region to which the uplink resource allocation information is mapped is predetermined or is configured by a higher layer signaling.