Mobile communication system and channel transmission/reception method thereof
A method and an apparatus for transmitting Hybrid Automatic Repeat reQuest (HARQ) Acknowledgement/Negative Acknowledgement (ACK/NACK) are provided. The HARQ ACK/NACK transmission method includes receiving a Physical Downlink Shared Channel (PDSCH) in a subframe of a first cell, identifying an ACK subframe for transmitting HARQ ACK/NACK corresponding to the PDSCH, and transmitting the HARQ ACK/NACK in the identified ACK subframe of a second cell.
1. A hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) transmission method of a terminal in a carrier aggregated system, the method comprising:
receiving a downlink control information (DCI) including a carrier indicator field (CIF) on a physical downlink control channel (PDCCH) in a first cell, the CIF indicating a cell in which data is transmitted;
receiving the data on a physical downlink shared channel (PDSCH) in the indicated cell;
determining a subframe to transmit a HARQ ACK/NACK for responding to the data based on a timing relation of a transmission of the HARQ ACK/NACK for the first cell; and
transmitting the HARQ ACK/NACK at the determined subframe in the first cell.
2. The method of claim 1 , wherein the first cell is a primary cell.
3. The method of claim 1 , further comprising:
multiplexing the HARQ ACK/NACKs in the determined subframe, if the HARQ ACK/NACKs of multiple cells are transmitted simultaneously at the determined subframe.
4. A hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) reception method of a terminal in a carrier aggregated system, the method comprising:
transmitting a downlink control information (DCI) including a carrier indicator filed (CIF) on a physical downlink control channel (PDCCH) of a first cell, the CIF indicating a cell in which data is transmitted;
transmitting the data on a physical downlink shared channel (PDSCH) in the indicated cell;
determining a subframe to receive a HARQ ACK/NACK for responding to the data based on a timing relation of a transmission of the HARQ ACK/NACK for the first cell; and
receiving the HARQ ACK/NACK responding to the data at the determined subframe in the first cell.
5. The method of claim 4 , wherein the first cell is a primary cell.
6. The method of claim 4 , further comprising:
if a multiplexed HARQ ACK/NACKs are transmitted at the determined subframe, demultiplexing the received the HARQ ACK/NACKs.
7. A terminal apparatus for transmitting a hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) in a carrier aggregated system, the apparatus comprising:
a physical downlink control channel (PDCCH) receiving unit configured to receive a downlink control information (DCI) including a carrier indicator field (CIF) on a PDCCH in a first cell, the CIF indicating a cell in which data is transmitted;
a physical downlink shared channel (PDSCH) receiving unit configured to receive the data on a PDSCH in the indicated cell;
a cell/timing controller configured to determine a subframe to transmit a HARQ ACK/NACK for responding to the data based on timing relation of a transmission of the HARQ ACK/NACK for the first cell; and
a physical HARQ indicator channel transmitting unit configured to transmit the HARQ ACK/NACK at the determined subframe in the first cell.
8. The method of claim 7 , wherein the first cell is a primary cell.
9. The method of claim 7 , further comprising:
multiplexing the HARQ ACK/NACKs in the determined subframe, if the HARQ ACK/NACKs of multiple cells are transmitted simultaneously at the determined subframe.
10. A base station apparatus for transmitting a hybrid automatic repeat request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) in a carrier aggregated system, the apparatus comprising:
a physical downlink control channel (PDCCH) transmitting unit configured to transmit a downlink control information (DCI) including a carrier indicator filed (CIF) on a PDCCH in a first cell, the CIF indicating a cell in which data is transmitted;
a physical downlink shared channel (PDSCH) transmitting unit configured to transmit the data on a PDSCH in the indicated cell;
a cell/timing controller configured to determine a subframe to receive a HARQ ACK/NACK for responding to the data based on timing relation of a transmission of the HARQ ACK/NACK for the first cell; and
a physical HARQ indicator channel transmitting unit configured to receive the HARQ ACK/NACK responding to the data at the determined subframe in the first cell.
11. The method of claim 10 , wherein the first cell is a primary cell.
12. The method of claim 10 , further comprising:
if a multiplexed HARQ ACK/NACKs are transmitted at the determined subframe, demultiplexing the received the HARQ ACK/NACKs.