Method and device for sending data via cross-carrier scheduling in wireless communication system supporting plurality of component carriers

1. A method of transmitting a data burst by a user equipment (UE) through cross-carrier scheduling in a system supporting a plurality of component carriers, the method comprising:

receiving, by the UE from a base station (BS), downlink control information (DCI) containing a carrier indicator field (CIF) through a physical downlink control channel (PDCCH) in a control region within a subframe, the CIF identifying either a downlink component carrier or an uplink component carrier and the DCI further containing a flag which is one bit information and indicates that the DCI is for either a downlink resources assignment or an uplink grant,

wherein two or more component carriers among the plurality of component carriers are assigned to the UE and the two or more component carriers are indexed in a UE-specific manner such that indexes of component carriers assigned to different UEs can be different, and

wherein the CIF includes an indexed value of the downlink component carrier or the uplink component carrier;

transmitting, by the UE to the BS, an uplink data burst through the uplink component carrier identified by the CIF when the flag indicates that the DCI is for the uplink grant; and

receiving by the UE from the BS, a downlink data burst through the downlink component carrier identified by the CIF when the flag indicates that the DCI is for the downlink resources assignment.

2. The method of claim 1 , wherein the DCI is for either a downlink scheduling assignment containing downlink resource assignment information or an uplink grant containing uplink resource assignment information.

3. The method of claim 1 , wherein the CIF is expressed by 3 bits.

4. A user equipment (UE) configured to transmit a data burst through cross-carrier scheduling in a system supporting a plurality of component carriers, the UE comprising:

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

a control unit connected to the RF unit,

wherein the control unit is configured to:

control the RF unit to receive, from a base station (BS), downlink control information (DCI) containing a carrier indicator field (CIF) through a physical downlink control channel (PDCCH) in a control region within a subframe, the CIF identifying either a downlink component carrier or an uplink component carrier and the DCI further containing a flag which is one bit information and indicates that the DCI is for either a downlink resources assignment or an uplink grant,

wherein two or more component carriers among the plurality of component carriers are assigned to the UE and the two or more component carriers are indexed in a UE-specific manner such that indexes of component carriers assigned to different UEs can be different, and

wherein the CIF includes an indexed value of the downlink component carrier or the uplink component carrier;

control the RF unit to receive, from the BS, a downlink data burst through the downlink component carrier identified by the CIF when the flag indicates that the DCI is for the downlink resources assignment; and

control the RF unit to transmit, to the BS, an uplink data burst through the uplink component carrier identified by the CIF when the flag indicates that the DCI is for the uplink grant.

5. The UE of claim 4 , wherein the DCI is for either a downlink scheduling assignment containing downlink resource assignment information or an uplink grant containing uplink resource assignment information.

6. The UE of claim 4 , wherein the CIF is expressed by 3 bits.