Method for measuring and reporting CSI-RS in wireless communication system, and apparatus for supporting same

1. A method for measuring and reporting a channel state information-reference signal (CSI-RS) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving a CSI-RS configuration from a network, the CSI-RS configuration including information indicating a plurality of CSI-RS resources which is an object to be measured;

measuring the plurality of CSI-RS resources in order to acquire a plurality of CSI-RS measurement results;

determining whether a specific number of CSI-RS resources associated with a specific number of CSI-RS measurement results is updated; and

transmitting a measurement report message to the network when the specific number of the CSI-RS resources is updated,

wherein the measurement report message includes the specific number of CSI-RS measurement results, a specific number of CSI-RS IDs and a report indicator,

wherein the specific number of CSI-RS measurement results has a higher level of quality from among the plurality of CSI-RS measurement results,

wherein the specific number of CSI-RS IDs identifies the specific number of CSI-RS resources associated with the specific number of CSI-RS measurement results,

wherein the report indicator indicates whether the specific number of CSI-RS measurement results is updated, and

wherein the specific number of CSI-RS resources is updated when the specific number of CSI-RS IDs for the specific number of CSI-RS resources is different from a specific number of CSI-RS IDs which is previously transmitted.

2. The method of claim 1 , wherein the determining whether the specific number of CSI-RS resources is updated includes:

determining that the specific number of CSI-RS resources is updated when the specific number of CSI-RS measurement results is acquired where the UE does not previously transmit a measurement report message including the CSI-RS measurement result to the network.

3. The method of claim 2 , wherein the determining whether the specific number of CSI-RS resources is updated includes:

determining that the specific number of CSI-RS resources is updated when a specific number of previously transmitted CSI-RS resource associated with the specific number of CSI-RS measurement results which is previously transmitted is different from the specific number of the CSI-RS resources Where the UE previously transmits the measurement report message including the CSI-RS measurement result to the network.

4. The method of claim 2 , wherein the determining whether the specific number of CSI-RS resources is updated includes:

determining that the specific number of CSI-RS resources is updated when a quality level order of measurement results with respect to the specific number of previous CSI-RS resources is different from a quality order of measurement results with respect to the specific number of the CSI-RS resources where the UE previously transmits the measurement report message including the CSI-RS measurement result to the network.

5. The method of claim 1 , wherein the measurement configuration message further includes information indicating a CSI-RS measurement result report period of the UE.

6. The method of claim 5 , further comprising:

starting a period timer set at the CSI-RS measurement result report period corresponding to transmission of the measurement report message; and

transmitting a next measurement report message when the period timer is terminated,

wherein the next measurement report message includes the specific number of CSI-RS measurement results having a higher level of quality from among the plurality of CSI-RS measurement results acquired by the UE when the period timer is terminated.

7. The method of claim 1 , wherein the CSI-RS measurement configuration includes information indicating a CSI-RS measurement result report reference.

8. The method of claim 7 , wherein the determining whether or not to report the CSI-RS measurement results includes:

determining whether at least one of the plurality of CSI-RS measurement results satisfies the CSI-RS measurement result report reference; and

transmitting the measurement report message to the network when the CSI-RS measurement result report reference is satisfied.

9. The method of claim 1 , wherein the plurality of CSI-RS resources includes measurement resources with respect to a plurality of transmission points (TPs) participating in coordinated multi-point transmission and reception (CoMP) operation with the UE.

10. The method of claim 1 , wherein the CSI-RS configuration is included in a measurement configuration set when the network measures and reports radio resource monitoring (RRM) in the terminal, and

the measurement report message includes a radio resource control (RRC) to be transmitted corresponding to the measurement configuration.

11. An Apparatus for measuring and reporting a channel state information-reference signal (CSI-RS) in a wireless communication system, the apparatus comprising:

a Radio Frequency (RF) unit configured to send and receive radio signals; and

a processor that is functionally coupled to the RF unit and operates, the processor configured to:

receive a CSI-RS configuration from a network, the CSI-RS configuration including information indicating a plurality of CSI-RS resources which is an object to be measured,

measure the plurality of CSI-RS resources in order to acquire a plurality of CSI-RS measurement results,

determine whether a specific number of CSI-RS resources associated with the specific number of CSI-RS measurement results is updated, and

transmit a measurement report message to the network when the specific number of the CSI-RS resource is updated,

wherein the measurement report message includes the specific number of CSI-RS measurement results, a specific number of CSI-RS IDs and a report indicator,

wherein the specific number of CSI-RS measurement results has a higher level of quality from among the plurality of CSI-RS measurement results,

wherein the specific number of CSI-RS IDs identifies the specific number of CSI-RS resources associated with the specific number of CSI-RS measurement results,

wherein the report indicator indicates whether the specific number of CSI-RS measurement results is updated, and

wherein the specific number of CSI-RS resources is updated when the specific number of CSI-RS IDs for the specific number of CSI-RS resources is different from a specific number of CSI-RS IDs which is previously transmitted.