Method by which terminal reports channel state information in wireless communication system and apparatus therefor
A method by which a terminal reports CSI in a wireless communication system, according to an embodiment of the present invention, comprises the steps of: calculating CSI for at least one interference measurement resource selected from among a plurality of interference measurement resources respectively having unique indices in a specific subframe; and reporting the CSI to a base station, wherein the CSI can be reported with a subframe index of the specific subframe and the unique index of the at least one interference measurement resource.
1. A method of reporting channel status information (CSI) by a user equipment in a wireless communication system, the method comprising:
receiving information on a plurality of interference measurement resources respectively having unique indexes in a specific subframe and information for a report type indicating a type of information to be reported further when reporting the CSI, from a base station;
calculating the CSI on the plurality of interference measurement resources;
selecting at least one interference measurement resource for which interference below a predetermined first threshold is calculated from the plurality of interference measurement resources based on the calculated CSI;
reporting only the CSI calculated for the selected at least one interference measurement resource to the base station based on the information for the report type; and
additionally reporting aggregation information including the unique indexes for interference measurement resources for which interference above a predetermined second threshold higher than the predetermined first threshold is calculated among the plurality of interference measurement resources based on the calculated CSI,
wherein the CSI is reported together with a subframe index of the specific subframe and a unique index of the selected at least one interference measurement resource when the report type of the CSI is a first report type,
wherein the CSI is reported together with a bitmap corresponding to the plurality of interference measurement resources when the report type of the CSI is a second report type, and
wherein the bitmap is configured such that a bit value of a position corresponding to the selected at least one interference measurement resource is configured to 1.
2. The method of claim 1 , wherein at least one of a downlink interference signal from the base station, an uplink interference signal from the user equipment or other user equipments, and a device-to-device (D2D) interference signal from the user equipment or other user equipments is transmitted on each of the plurality of interference measurement resources.
3. The method of claim 1 , further comprising receiving a control signal indicating an interference measurement resource set configured with some of the plurality of interference measurement resources from the base station,
wherein the at least one interference measurement resource is selected from the interference measurement resource set by the user equipment.
4. A user equipment configured to report channel status information (CSI) in a wireless communication system, the user equipment comprising:
a transceiver; and
a processor,
wherein the processor is configured to:
control the transceiver to receive information on a plurality of interference measurement resources respectively having unique indexes in a specific subframe and information for a report type indicating a type of information to be reported further when reporting the CSI, from a base station,
calculate the CSI on the plurality of interference measurement resources,
select at least one interference measurement resource for which interference below a predetermined first threshold is calculated from the plurality of interference measurement resources based on the calculated CSI,
report only the CSI calculated for the selected at least one interference measurement resource to the base station based on the information for the report type, and
additionally report aggregation information including the unique indexes for interference measurement resources for which interference above a predetermined second threshold higher than the predetermined first threshold is calculated among the plurality of interference measurement resources based on the calculated CSI
wherein the CSI is reported together with a subframe index of the specific subframe and a unique index of the selected at least one interference measurement resource when the report type of the CSI is a first report type,
wherein the CSI is reported together with a bitmap corresponding to the plurality of interference measurement resources when the report type of the CSI is a second report type, and
wherein the bitmap is configured such that a bit value of a position corresponding to the selected at least one interference measurement resource is configured to 1.
5. The user equipment of claim 4 , wherein at least one of a downlink interference signal from the base station, an uplink interference signal from the user equipment or other user equipments, and a device-to-device (D2D) interference signal from the user equipment or other user equipments is transmitted on each of the plurality of interference measurement resources.
6. The user equipment of claim 4 , wherein the processor is further configured to receive a control signal indicating an interference measurement resource set configured with some of the plurality of interference measurement resources from the base station and wherein the at least one interference measurement resource is selected from the interference measurement resource set by the user equipment.