Terminal device, integrated circuit, and radio communication method

A communication method for a terminal device, the method comprising:

• receiving a signal of a higher layer including first information used to instruct two subframe sets and receiving downlink control information including information for requesting report of channel state information regarding one subframe set of the two subframe sets;
• and
• reporting the channel state information derived with reference to a channel state information reference resource using subframe n, wherein
• the channel state information reference resource is defined by one downlink subframe n−nCQI_ref or one special subframe n−nCQI_ref on a time domain,
• in a case in which the two subframe sets are not configured, nCQI_ref is a value in which the channel state information reference resource is present in a valid downlink subframe or a valid special subframe which is the same as a downlink subframe or a special subframe with which the information included in the downlink control information is received,
• in a case in which downlink subframe n−4 or special subframe n−4 in which the two subframe sets are configured and with which the information included in the downlink control information is received corresponds to a valid downlink subframe or a valid special subframe, nCQI_ref is 4,
• in a case in which the downlink subframe n−4 or the special subframe n−4 in which the two subframe sets are configured and with which the information included in the downlink control information is received does not correspond to the valid downlink subframe or the valid special subframe, nCQI_ref is a value greater than 4 in which the channel state information reference resource is present in the valid downlink subframe or the valid special subframe, and
• the channel state information reference resource belongs to one of the two subframe sets, but not to both of the two subframe sets.

An integrated circuit mounted on a terminal device and causing the terminal device to perform:

• a function of receiving a signal of a higher layer including first information used to instruct two subframe sets and receiving downlink control information including information for requesting report of channel state information regarding one subframe set of the two subframe sets;
• and
• a function of reporting the channel state information derived with reference to a channel state information reference resource using subframe n, wherein
• the channel state information reference resource is defined by one downlink subframe n−nCQI_ref or one special subframe n−nCQI_ref on a time domain,
• in a case in which the two subframe sets are not configured, nCQI_ref is a value in which the channel state information reference resource is present in a valid downlink subframe or a valid special subframe which is the same as a downlink subframe or a special subframe with which the information included in the downlink control information is received,
• in a case in which downlink subframe n−4 or special subframe n−4 in which the two subframe sets are configured and with which the information included in the downlink control information is received corresponds to a valid downlink subframe or a valid special subframe, nCQI_ref is 4,
• in a case in which the downlink subframe n−4 or the special subframe n−4 in which the two subframe sets are configured and with which the information included in the downlink control information is received does not correspond to the valid downlink subframe or the valid special subframe, nCQI_ref is a value greater than 4 in which the channel state information reference resource is present in the valid downlink subframe or the valid special subframe, and
• the channel state information reference resource belongs to one of the two subframe sets, but not to both of the two subframe sets.