Method and apparatus for measuring channel in wireless communication system

1. A method for measuring channel by a user equipment (UE) in a wireless communication system supporting carrier aggregation (CA) and coordinated Multi-point transmission and reception (CoMP), the method comprising:

receiving, by the UE from a serving evolved NodeB (eNB), information on a channel state information—reference signal (CSI-RS) resource set (hereinafter referred to as CRMS (CoMP resource management set)) for measuring CSI-RS-based received power,

wherein the CRMS is independently configured for each of a plurality of component carriers (CCs) to be aggregated in the CA;

receiving, by the UE from the serving eNB, activation/deactivation information on a secondary cell (SCell) corresponding to at least one component carrier (CC) from among the plurality of CCs; and

if the activation/deactivation information indicates deactivation of the SCell:

allocating, by the UE, a measurement capability for the at least one CC to the remaining activated CCs from among the plurality of CCs during the deactivation of the SCell;

measuring, by the UE, a received power for the CSI-RS resources contained in the CRMS on the remaining activated CCs; and

transmitting the measured received power by the UE to the serving eNB.

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

receiving an instruction to measure the received power for the CSI-RS resources contained in a CRMS on the remaining activated CCs.

3. The method according to claim 2 , wherein:

a period for measuring the received power during the deactivation of the SCell is different from a period for measuring the received power during an activation of the SCell.

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

if the activation/deactivation information indicates activation of the SCell, measuring a received power for CSI-RS resources contained in a CRMS configured for at least one CC corresponding to the SCell during a predetermined period of time, prior to activation of the SCell.

5. The method according to claim 4 , wherein the predetermined period of time is configured via higher layer signaling.

6. The method according to claim 4 , wherein the measurement of the received power for the CSI-RS resources contained in the CRMS configured for at least one CC corresponding to the SCell during the predetermined period of time prior to activation of the SCell is performed when a deactivation time period of the SCell is longer than a predetermined length.

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

receiving information indicating that a CRMS configured for at least one of the plurality of component carriers (CCs) is integrated with a CRMS for a specific component carrier (CC) from the serving eNB.

8. The method according to claim 7 , further comprising:

allocating measurement capability for the at least one of the plurality of CCs to a measurement for the specific CC.

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

performing intra-frequency measurement for a CRMS (hereinafter referred to a first CRMS) configured for one of the plurality of CCs, and performing inter-frequency measurement for CRMSs (hereinafter referred to as a second CRMS) configured for another of the plurality of CCs,

wherein the first CRMS is larger in size than the second CRMS, and a period for reporting the intra-frequency measurement of the first CRMS is shorter than a period for reporting the inter-frequency measurement of the second CRMS.

10. A user equipment (UE) configured to measure channel in a wireless communication system supporting carrier aggregation (CA) and coordinated Multi-point transmission and reception (CoMP), the user equipment (UE) comprising:

a radio frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to:

receive, from a serving evolved NodeB (eNB), information on a channel state information—reference signal (CSI-RS) resource set (hereinafter referred to as CRMS (CoMP resource management set)) for measuring CSI-RS—based received power,

wherein the CRMS is independently configured for each of a plurality of component carriers (CCs) to be aggregated in the CA,

receive, from the serving eNB, activation/deactivation information on a secondary cell (SCell) corresponding to at least one component carrier (CC) from among the plurality of CCs, and

if the activation/deactivation information indicates deactivation of the SCell:

allocate a measurement capability for the at least one CC to the remaining activated CCs from among the plurality of CCs during the deactivation of the SCell,

measure a received power for the CSI-RS resources contained in the CRMS on the remaining activated CCs, and

transmit the measured received power to the serving eNB.