Method and apparatus for transmitting and receiving a signal in a wireless communication system that supports plural component carriers

1. A method for receiving a signal by a user equipment (UE) in a wireless communication system supporting multiple component carriers (CCs), the method comprising:

receiving, by the UE from a base station (BS), information including an index of a reference CC which is UE-specifically determined by the BS among the multiple CCs so that the reference CC can be different between different UEs located in a cell;

receiving, by the UE, a subframe including a plurality of orthogonal frequency division multiplexing (OFDM) symbols from the BS; and

receiving, by the UE through one or more contiguous OFDM symbols within the subframe from the BS, scheduling information associated with a specific component carrier (CC) allocated to the UE, and a carrier indication field (CIF) which includes an offset value used to identify the specific CC,

wherein a first part and a second part of all values to be represented by the CIF have been pre-allocated for downlink CCs and uplink CCs, respectively, so that the CIF is also used to identify whether the specific CC is either a downlink CC or an uplink CC, and

wherein the offset value is equal to a difference between an index of the specific CC and the index of the reference CC.

2. The method according to claim 1 , further comprising:

receiving index mapping information related to an index mapping rule of multiple CCs used in the UE according to carrier scheduling, from the BS,

wherein the UE obtains location information of the specific CC using the index mapping information and the offset value included in the CIF for the specific CC.

3. The method according to claim 2 , wherein the index mapping rule of the multiple CCs includes a sequentially indexed mapping rule in which indexing is performed considering whether the multiple CCs correspond to uplink or downlink, and an arbitrarily indexed mapping rule in which indexing is performed without discriminating between uplink and downlink.

4. A method for transmitting a signal by a base station (BS) in a wireless communication system supporting multiple component carriers (CCs), the method comprising:

transmitting, by the BS, information including an index of a reference CC which is user equipment (UE)-specifically determined by the BS among the multiple CCs so that the reference CC can be different between different UEs located in a cell;

scheduling, by the BS, a plurality of CCs used by a UE; and

transmitting, by the BS through one or more contiguous orthogonal frequency division multiplexing (OFDM) symbols within a subframe to the UE, scheduling information associated with a specific CC allocated to the UE, and a carrier indication field (CIF) which includes an offset value used to identify the specific CC,

wherein a first part and a second part of all values to be represented by the CIF have been pre-allocated for downlink CCs and uplink CCs, respectively, so that the CIF is also used to identify whether the specific CC is either a downlink CC or an uplink CC, and

wherein the offset value is equal to a difference between an index of the specific CC and the index of the reference CC.

5. The method according to claim 4 , further comprising transmitting index mapping information related to an index mapping rule of multiple CCs depending on carrier scheduling, to the UE.

6. The method according to claim 5 , wherein the index mapping rule of the multiple CCs includes a sequentially indexed mapping rule in which indexing is performed considering whether the multiple CCs correspond to uplink or downlink, and an arbitrarily indexed mapping rule in which indexing is performed without discriminating between uplink and downlink.

7. A user equipment (UE) for use in a wireless communication system supporting multiple carriers, the UE comprising:

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

a processor configured to:

receive, through the receiver, information including an index of a reference component carrier (CC) which is UE-specifically determined by a base station (BS) among multiple CCs so that the reference CC can be different between different UEs located in a cell, scheduling information associated with a specific CC allocated to the UE, and a carrier indication field (CIF) which includes an offset value used to identify the specific CC through one or more contiguous orthogonal frequency division multiplexing (OFDM) symbols within a subframe including a plurality of OFDM symbols received from the BS,

wherein a first part and a second part of all values to be represented by the CIF have been pre-allocated for downlink CCs and uplink CCs, respectively, so that the CIF is also used to identify whether the specific CC is either a downlink CC or an uplink CC,

acquire location information of the specific CC using index mapping information related to an index mapping rule of multiple CCs used in the UE, and

transmit and receive a signal through the specific CC,

wherein the offset value is equal to a difference between an index of the specific CC and the index of the reference CC.

8. The UE according to claim 7 , wherein the processor determines whether the specific CC corresponds to uplink or downlink using the index mapping information and the offset value included in the CIF for the specific CC.

9. The UE according to claim 8 , wherein the index mapping rule of the multiple CCs includes a sequentially indexed mapping rule in which indexing is performed considering whether the multiple CCs correspond to uplink or downlink, and an arbitrarily indexed mapping rule in which indexing is performed without discriminating between uplink and downlink.

10. A base station (BS) for use in a wireless communication system supporting multiple carriers, the BS comprising:

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

a processor configured to:

map indexes of multiple component carriers (CCs) used in a user equipment (UE) according to carrier scheduling, and

construct scheduling information associated with a specific CC allocated to the UE, and a carrier indication field (CIF) which includes an offset value used to identify the specific CC among the multiple CCs,

wherein the processor is further configured to transmit, through the transmitter, information including an index of a reference CC which is user equipment (UE)-specifically determined by the processor among the multiple CCs so that the reference CC can be different between different UEs located in a cell, the scheduling information, the CIF and index mapping information of the multiple CCs to the UE through one or more contiguous orthogonal frequency division multiplexing (OFDM) symbols within a subframe including a plurality of OFDM symbols, wherein a first part and a second part of all values to be represented by the CIF have been pre-allocated for downlink CCs and uplink CCs, respectively, so that the CIF is also used to identify whether the specific CC is either a downlink CC or an uplink CC, and

wherein the offset value is equal to a difference between an index of the specific CC and the index of the reference CC.

11. The BS according to claim 10 , wherein an index mapping rule of the multiple CCs includes a sequentially indexed mapping rule in which indexing is performed considering whether the multiple CCs correspond to uplink or downlink, and an arbitrarily indexed mapping rule in which indexing is performed without discriminating between uplink and downlink.