Apparatus and method for defining physical channel transmit/receive timings and resource allocation in TDD communication system supporting carrier aggregation

A method for transmitting, at a terminal, a Hybrid Automatic Repeat Request (HARQ) acknowledgement to a base station in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the method comprising:

• receiving a downlink physical channel through one of the primary and secondary cells;
• transmitting the HARQ acknowledgement corresponding to a first downlink physical channel of the primary cell in a first subframe predetermined for the primary cell, if the first downlink physical channel is received via the primary cell;
• and
• transmitting the HARQ acknowledgement corresponding to a second downlink physical channel of the secondary cell in a second subframe, if the second downlink physical channel is transmitted via the secondary cell,
• wherein the second subframe is determined based on a timing relationship between a downlink physical channel and an uplink HARQ acknowledgement of the primary cell.

A base station for receiving a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the base station comprising:

• a transceiver which transmits and receives to and from the terminal;
• and
• a controller which controls transmitting a downlink physical channel through one of the primary and secondary cells, receiving the HARQ acknowledgement corresponding to a first downlink physical channel of the primary cell in a first subframe predetermined for the primary cell, if the first downlink physical channel is transmitted via the primary cell, and receiving the HARQ acknowledgement corresponding to a second downlink physical channel of the secondary cell in a second subframe, if the second downlink physical channel is transmitted via the secondary cell,
• wherein the controller is configured to determine the second subframe based on a timing relationship between a downlink physical channel and an uplink HARQ acknowledgement of the primary cell.

A terminal for transmitting a Hybrid Automatic Repeat Request (HARQ) acknowledgement to a base station in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell, the terminal comprising:

• a transceiver which transmits and receives to and form a base station;
• and
• a controller which controls receiving a downlink physical channel through one of the primary and secondary cells, transmitting the HARQ acknowledgement corresponding to a first downlink physical channel of the primary cell in a first subframe predetermined for the primary cell, if the first downlink physical channel is received via the primary cell, and transmitting the HARQ acknowledgement corresponding to the a second downlink physical channel of the secondary cell in a second subframe, if the second downlink physical channel is transmitted via the secondary cell,
• wherein the controller is configured to determine the second subframe based on a timing relationship between a downlink physical channel and an uplink HARQ acknowledgement of the primary cell.