| 摘要 |
The present invention is designed such that, when a user terminal performs radio communication using a plurality of serving cells of different component carriers, it is possible to flexibly report aperiodic channel state information of a serving cell required on the network side among the plurality of serving cells. A radio base station apparatus transmits an uplink scheduling grant, which includes an identification field that identifies an uplink serving cell where an uplink shared channel is allocated among a plurality of uplink serving cells and a request field that requests reporting of aperiodic channel state information from a user terminal, to the user terminal, via a downlink control channel, and the user terminal reports aperiodic channel state information of a downlink serving cell that is designated by a combination of the identification field and the request field, to the radio base station apparatus, via the uplink shared channel. |
