Method for transmitting channel state information report and user equipment, and method for receiving channel state information report and base station
The user equipment and the base station according to the present invention determine differently whether a downlink subframe is a valid reference resource for a channel state information report, in accordance with whether an interference measurement resource is explicitly configured to the user equipment.
1. A method for controlling channel state information (CSI) reporting by a user equipment, the method comprising:
receiving, by the user equipment, configuration information of a periodic zero-power CSI-reference signal (CSI-RS) resource;
receiving, by the user equipment, a control signal requesting an aperiodic CSI at a multimedia broadcast single frequency network (MBSFN) subframe; and
controlling, by the user equipment, a transmission of the aperiodic CSI for the MBSFN subframe, depending on whether or not the periodic zero-power CSI-RS resource is located in the MBSFN subframe,
wherein the transmission of the aperiodic CSI for the MBSFN subframe is performed if the periodic zero-power CSI-RS resource is located in the MBSFN, and
wherein the transmission of the aperiodic CSI for the MBSFN subframe is skipped if the periodic zero-power CSI-RS resource is not located in the MBSFN subframe.
2. The method according to claim 1 , wherein the MBSFN subframe includes a cell-specific reference signal (CRS) within first two orthogonal frequency division multiplexing (OFDM) symbols.
3. The method according to claim 2 , wherein the periodic zero-power CSI-RS resource is configured to occur with a specific periodicity corresponding to a plurality of subframes.
4. A user equipment for controlling channel state information (CSI) reporting, the user equipment comprising:
a transceiver: and
a processor configured to:
control the transceiver to receive configuration information of a periodic zero-power CSI-reference signal (CSI-RS) resource,
control the transceiver to receive a control signal requesting an aperiodic CSI at a multimedia broadcast single frequency network (MBSFN) subframe,
control a transmission of the aperiodic CSI for the MBSFN subframe, depending on whether or not the periodic zero-power CSI-RS resource is located in the MBSFN subframe,
perform the transmission of the aperiodic CSI for the MBSFN subframe if the periodic zero-power CSI-RS resource is located in the MBSFN subframe, and
skip the transmission of the aperiodic CSI for the MBSFN subframe if the periodic zero-power CSI-RS resource is not located in the MBSFN subframe.
5. The user equipment according to claim 4 , wherein the MBSFN subframe includes a cell-specific reference signal (CRS) within first two orthogonal frequency division multiplexing (OFDM) symbols.
6. The user equipment according to claim 5 , wherein the periodic zero-power CSI-RS resource is configured to occur with a specific periodicity corresponding to a plurality of subframes.