Method and apparatus for transmitting control information in wireless communication system
The present invention relates to a wireless communication system, particularly, a method in which a terminal transmits control information in a CA-based wireless communication system and an apparatus for the method, the method comprising: configuring a first cell and a second cell having different subframe configurations, wherein the second cell has any one of UL-DL configuration #0 to #6; receiving a DC) format including a DAI field, for the second cell; and transmitting HARQ-ACK information relating to the downlink DCI format. For HARQ-ACK timing, in cases where a reference UL-DL configuration applied to the second cell is any one of UL-DL configurations #1 to #6, the DAI field is used in a process of transmitting the HARQ-ACK information. For HARQ-ACK timing, in cases where a reference UL-DL configuration applied to the second cell is #0, the DAI field is not used in a process of transmitting the HARQ-ACK information.
1. A method for transmitting control information by a user equipment (UE) in a carrier aggregation (CA)-based wireless communication system, the UE configured with a first cell set to one of uplink-downlink (UL-DL) configurations #0 to #6 and a second cell set to another of UL-DL configurations #0 to #6, the method comprising:
receiving a downlink control information (DCI) having a DL DCI format comprising a downlink assignment index (DAI) field, for the second cell; and
transmitting hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information related to the DCI,
wherein, for HARQ-ACK timing, if a reference UL-DL configuration applied to the second cell is one of UL-DL configurations #1 to #6, the DAI field is used in a procedure for transmitting the HARQ-ACK information,
wherein, for HARQ-ACK timing, if a reference UL-DL configuration applied to the second cell is UL-DL configuration #0, the DAI field is not used in a procedure for transmitting the HARQ-ACK information, and
wherein subframe configurations according to the UL-DL configurations #0 to #6 are given as shown in the following table:
UL-DL
Subframe Number
Configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
where, D denotes a DL subframe, U denotes a UL subframe, and S denotes a special subframe.
2. The method according to claim 1 , wherein the first cell is set to UL-DL configuration #0, and the second cell is set to one of UL-DL configurations #1 to #6.
3. The method according to claim 2 , wherein the first cell is a primary cell (PCell), and the second cell is a secondary cell (SCell).
4. The method according to claim 3 , wherein the DL DCI format further comprises a carrier indicator field (CIF).
5. The method according to claim 4 , wherein the DL DCI format comprises DCI format 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, or 2D.
6. The method according to claim 1 , wherein the HARQ-ACK information comprises at least one of
acknowledgement information about a physical downlink shared channel (PDSCH) signal indicated by the DCI, or
acknowledgement information about a physical downlink control channel (PDCCH) signal comprising the DCI and indicating semi-persistent scheduling (SPS) release.
7. A user equipment (UE) used in a carrier aggregation (CA)-based wireless communication system, the UE configured with a first cell set to one of uplink-downlink (UL-DL) configurations #0 to #6 and a second cell set to another of UL-DL configurations #0 to #6, the UE comprising:
a radio frequency (RF) unit; and
a processor,
wherein the processor is configured to:
receive a downlink control information (DCI) format comprising a downlink assignment index (DAI) field, for the second cell; and
transmit hybrid automatic repeat request (HARQ)-acknowledgement (ACK) information related to the DCI,
wherein, for HARQ-ACK timing, if a reference UL-DL configuration applied to the second cell is one of UL-DL configurations #1 to #6, the DAI field is used in a procedure for transmitting the HARQ-ACK information,
wherein, for HARQ-ACK timing, if a reference UL-DL configuration applied to the second cell is UL-DL configuration #0, the DAI field is not used in a procedure for transmitting the HARQ-ACK information, and
wherein subframe configurations according to the UL-DL configurations are given as shown in the following table:
UL-DL
Subframe Number
Configuration
0
1
2
3
4
5
6
7
8
9
0
D
S
U
U
U
D
S
U
U
U
1
D
S
U
U
D
D
S
U
U
D
2
D
S
U
D
D
D
S
U
D
D
3
D
S
U
U
U
D
D
D
D
D
4
D
S
U
U
D
D
D
D
D
D
5
D
S
U
D
D
D
D
D
D
D
6
D
S
U
U
U
D
S
U
U
D
where, D denotes a DL subframe, U denotes a UL subframe, and S denotes a special subframe.
8. The UE according to claim 7 , wherein the first cell is set to UL-DL configuration #0, and the second cell is set to one of UL-DL configurations #1 to #6.
9. The UE according to claim 8 , wherein the first cell is a primary cell (PCell), and the second cell is a secondary cell (SCell).
10. The UE according to claim 9 , wherein the DL DCI format further comprises a carrier indicator field (CIF).
11. The UE according to claim 10 , wherein the DL DCI format comprises DCI format 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, or 2D.
12. The UE according to claim 7 , wherein the HARQ-ACK information comprises at least one of
acknowledgement information about a physical downlink shared channel (PDSCH) signal indicated by the DCI, or
acknowledgement information about a physical downlink control channel (PDCCH) signal comprising the DCI and indicating semi-persistent scheduling (SPS) release.