Aperiodic channel state information reporting method, radio base station apparatus and user terminal

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.

主权项

1. An aperiodic channel state information reporting method comprising the steps of:
transmitting, from a radio base station apparatus to a user terminal, via a downlink control channel, 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 the user terminal; and when both the identification field and the request field correspond to at least one downlink serving cell to be a target for aperiodic channel state information reporting and the uplink serving cell to be used for the aperiodic channel state information reporting, reporting aperiodic channel state information of at least one downlink serving cell designated by a combination of both the identification field and the request field included in the uplink scheduling grant, from the user terminal to the radio base station apparatus, via an uplink shared channel, wherein, when the uplink shared channel is allocated to the uplink serving cell identified by the identification field, the radio base station apparatus designates at least one downlink serving cell, aperiodic channel state information of which needs to be reported from the user terminal, using the request field; wherein the request field comprises at least two bits and different downlink serving cells are designated by the same request field.