Patent ID: 9716570
Date: 2017-07-25
CPC Classifications: H04L,H04W

Claim:
1. A communication apparatus comprising: a receiver which, in operation, receives downlink data transmitted on a plurality of component carriers including a Primary Cell and a Secondary Cell, wherein the Primary Cell and the Secondary Cell have different frame configuration patterns among a plurality of frame configuration patterns, each frame configuration pattern defining transmission timings of one or more uplink subframes, one or more downlink subframes and one or more special subframes within a frame, and wherein a first frame configuration pattern for the Primary Cell defines transmission timing(s) of one or more uplink subframes that are all inclusive of transmission timing(s) of one or more uplink subframes defined by a second frame configuration pattern for the Secondary Cell, and the first frame configuration pattern defines at least one more uplink subframe than defined by the second frame configuration pattern; a response signal generator which, in operation, performs error detection of the downlink data for each of the Primary Cell and the Secondary Cell, and generates a response signal indicating error detection results of the downlink data; and a transmitter which, in operation, transmits the response signal of the Primary Cell and the Secondary Cell on an uplink subframe of the Primary Cell, the uplink subframe of the Primary Cell being defined at the same timing as one of the transmission timing(s) of the one or more uplink subframes defined by the second frame configuration pattern, the uplink subframe of the Primary Cell being located at a position at least four subframes after a downlink subframe for which the response signal is generated.