APERIODIC CHANNEL STATE INFORMATION REPORTING METHOD, WIRELESS BASE STATION DEVICE, AND USER TERMINAL

摘要

The present invention flexibly reports aperiodic channel state information (A-CSI) even if a user terminal performs wireless communication using a plurality of component carriers (CC) in a HetNet environment. The present invention is characterized by including: a step (step ST401) for transmitting in advance, from a pico base station (PeNB) to pico UE, information to undergo CS measurement, said information specified by associating together trigger bit information that indicates information pertaining to a CC to be measured and the presence or lack of channel state information reporting, and information pertaining to a subframe to be measured and the presence or lack of channel state information reporting; and a step (step ST406) for reporting, to the pico base station (PeNB) using a PUSCH, the channel state information of the CC and the subframe specified by the trigger bit information transmitted using a PDCCH.