Terminal device, and buffer partitioning method

An integrated circuit, which, in operation, controls a process performed at a terminal apparatus, the process comprising:

• receiving first and second downlink data in first and second component carriers, respectively, wherein a first configuration pattern of UL (uplink) and DL (downlink) subframes is set for the first component carrier and a second configuration pattern of UL and DL subframes is set for the second component carrier;
• and
• storing retransmission data of the first and second downlink data in a soft buffer, wherein the soft buffer for the second downlink data is sized according to a maximum number of downlink HARQ (hybrid automatic repeat request) retransmission processes executable in a reference configuration pattern of UL and DL subframes, the maximum number of downlink HARQ retransmission processes is determined according to the reference configuration pattern, and the reference configuration pattern is determined according to the first and second configuration patterns.