User equipment and method

A method used for a user equipment, comprising:

• receiving a first control information from a base station, the first control information designating a first time region on which a first Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) to be transmitted, the first HARQ-ACK corresponding to a first data transmitted on a first Physical Downlink Shared Channel (PDSCH) in which a transmission time interval is shorten than one subframe, the first time region being shorten than one subframe;
• attempting to receive a second data transmitted on a second PDSCH in which a transmission time interval is one subframe;
• and
• transmitting a second HARQ-ACK corresponding to the second data on the first time region.

An apparatus for controlling a user equipment, comprising:

• a processor and a memory coupled to the processor, wherein the processor is configured to execute processes of:
• receiving a first control information from a base station, the first control information designating a first time region on which a first Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) to be transmitted, the first HARQ-ACK corresponding to a first data transmitted on a first Physical Downlink Shared Channel (PDSCH) in which a transmission time interval is shorten than one subframe, the first time region being shorten than one subframe;
• attempting to receive a second data transmitted on a second PDSCH in which a transmission time interval is one subframe;
• and
• transmitting a second HARQ-ACK corresponding to the second data on the first time region.