Tdd base station data transmission system, a terminal, system and method

The base station, a terminal, system and method for data transmission of the present invention provides a TDD system, the method comprising one of the base station transmits on carrier m uplink scheduling grant signaling to the terminal, the terminal receives an uplink in the use of physical carrier n after the uplink shared channel PUSCH data channel transmission, the transmission to the terminal on the carrier m ACK / NACK feedback signaling corresponding to the PUSCH; the m ≠ n; the base station transmitting the uplink scheduling grant signaling and / or ACK / NACK subframe timing relationship with the feedback signaling of the PUSCH sub-frame, with the carrier in either m or n, the configuration corresponding to the downlink hybrid automatic repeat request HARQ same timing relationship. Aspect of the present invention may be utilized to achieve HARQ timing relationship existing cross-carrier scheduling, to achieve EICIC function, while also maintaining low complexity devices.