Terminal device, integrated circuit, and radio communication method

A radio communication method used for a terminal device that communicates with a base station device by using a single serving cell, the radio communication method comprising:

• receiving first information indicating an uplink-downlink configuration, second information indicating an uplink-downlink configuration, third information indicating an uplink-downlink configuration, and an uplink grant including a channel state information request to be used to trigger aperiodic reporting of channel state information;
• deriving an index of a channel quality indicator on the basis of a channel state information reference resource, for a value of the channel quality indicator to be reported in a subframe n;
• reporting the channel state information including the channel quality indicator;
• transmitting a physical uplink shared channel corresponding to detection of a physical downlink control channel, with reference to the uplink-downlink configuration indicated by the first information;
• and
• transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) corresponding to detection of a physical downlink shared channel, with reference to the uplink-downlink configuration indicated by the second information;
• wherein, in a time domain, the channel state information reference resource is defined by a subframe n−nCQI ref;
• for periodic reporting of the channel state information, the nCQI ref is the smallest value that is equal to or greater than four so that the subframe n−nCQI ref corresponds to a valid subframe;
• for aperiodic reporting of the channel state information, the nCQI ref is four, the subframe n−nCQI ref corresponds to a valid subframe, and the subframe n−nCQI ref is later than a subframe n−k, the channel state information request corresponding to the subframe n−nCQI ref being received in the subframe n−k;
• a subframe that satisfies criteria including at least a criterion (i) is regarded as being valid;
• in the criterion (i), in a case where the third information for a radio frame is detected, the uplink-downlink configuration for the radio frame is given by the third information for the radio frame;
• in the criterion (i), in a case where the third information for the radio frame is not detected, the uplink-downlink configuration for the radio frame is given by the first information;
• the criterion (i) stipulates that the subframe is a subframe indicated as a downlink subframe or a special subframe by the uplink-downlink configuration for the radio frame;
• and
• in a case where a subframe n−4 is not the valid subframe for the aperiodic reporting of the channel state information, reporting of the channel state information is omitted in the subframe n.

An integrated circuit incorporated into a terminal device that communicates with a base station device by using a single serving cell, the integrated circuit causing the terminal device to perform a series of functions comprising:

• receiving first information indicating an uplink-downlink configuration, second information indicating an uplink-downlink configuration, third information indicating an uplink-downlink configuration, and an uplink grant including a channel state information request to be used to trigger aperiodic reporting of channel state information;
• deriving an index of a channel quality indicator on the basis of a channel state information reference resource, for a value of the channel quality indicator to be reported in a subframe n;
• reporting the channel state information including the channel quality indicator;
• transmitting a physical uplink shared channel corresponding to detection of a physical downlink control channel, with reference to the uplink-downlink configuration indicated by the first information;
• and
• transmitting a hybrid automatic repeat request acknowledgement (HARQ-ACK) corresponding to detection of a physical downlink shared channel, with reference to the uplink-downlink configuration indicated by the second information;
• wherein, in a time domain, the channel state information reference resource is defined by a subframe n−nCQI ref;
• for periodic reporting of the channel state information, the nCQI ref is the smallest value that is equal to or greater than four so that the subframe n−nCQI ref corresponds to a valid subframe;
• for aperiodic reporting of the channel state information, the nCQI ref is four, the subframe n−nCQI ref corresponds to a valid subframe, and the subframe n−nCQI ref is later than a subframe n−k, the channel state information request corresponding to the subframe n−nCQI ref being received in the subframe n−k;
• a subframe that satisfies criteria including at least a criterion (i) is regarded as being valid;
• in the criterion (i), in a case where the third information for a radio frame is detected, the uplink-downlink configuration for the radio frame is given by the third information for the radio frame;
• in the criterion (i), in a case where the third information for the radio frame is not detected, the uplink-downlink configuration for the radio frame is given by the first information;
• the criterion (i) stipulates that the subframe is a subframe indicated as a downlink subframe or a special subframe by the uplink-downlink configuration for the radio frame;
• and
• in a case where a subframe n−4 is not the valid subframe for the aperiodic reporting of the channel state information, reporting of the channel state information is omitted in the subframe n.