Apparatus and method
[Object] To provide a mechanism capable of more appropriately ascertaining an interference condition of a data signal. [Solution] An apparatus includes: a processing unit that feeds back a channel quality indicator (CQI) of a serving base station, which is calculated on a basis of results of measuring reference signals received from the serving base station and a neighbor base station and information related to a power difference between the reference signal and a data signal of the neighbor base station, to the serving base station.
1. An apparatus comprising:
processing circuitry configured to
acquire scheduling information from another apparatus;
measure a first reference signal non-zero-power (NZP) CSI-RS received from the serving base stations for channel measurement;
measure a second reference signal CSI-RS received for interference measurement;
derive a channel quality indicator (CQI) based on a ratio of PDSCH energy per resource element (EPRE) to CSI-RS EPRE; and
feed back channel status information including the CQI, wherein the CQI is reported for each sub-band.
2. The apparatus according to claim 1 , wherein the CQI is reported for each sub-band when a certain condition is satisfied.
3. The apparatus according to claim 2 , wherein the certain condition is concerning a signal.
4. The apparatus of claim 3 , wherein the signal is a data signal.
5. An apparatus comprising:
processing circuitry configured to
provide scheduling information to another apparatus;
derive a channel quality indicator (CQI) based on a ratio of PDSCH energy per resource element (EPRE) to CSI-RS EPRE; and
receive feed back channel status information including the CQI, wherein the CQI is reported for each sub-band.
6. The apparatus according to claim 5 , wherein the CQI is reported for each sub-band when a certain condition is satisfied.
7. The apparatus according to claim 6 , wherein the certain condition concerns a signal.
8. The apparatus of claim 7 , wherein the signal is a data signal.
9. A method comprising:
acquiring scheduling information from another apparatus;
measuring a first reference signal non-zero-power (NZP) CSI-RS received from the serving base stations for channel measurement;
measuring a second reference signal CSI-RS received for interference measurement;
deriving a channel quality indicator (CQI) based on a ratio of PDSCH energy per resource element (EPRE) to CSI-RS EPRE for each resource; and
feeding back channel status information including the CQI, wherein the CQI is reported for each sub-band.
10. The method according to claim 9 , further comprising reporting the CQI for each sub-band when a certain condition is satisfied.
11. The method according to claim 10 , wherein the certain condition concerns a signal.
12. The method of claim 11 , wherein the signal is a data signal.