Method and apparatus for transmitting control information in wireless communication system
The present invention relates to a method for receiving a downlink control signal in a TDD-based wireless communication system, and to an apparatus therefor. The method comprises receiving a downlink signal via a downlink interval in a specific frame including the downlink interval, a guard interval and an uplink interval. A combination of the downlink interval, the guard interval and the uplink interval is given using configuration information on the specific subframe. When the configuration information is given such that the length of the downlink interval is larger than a specific value, detecting a first type of PDCCH is performed in the specific subframe. When the configuration information is given such that the length of the downlink interval is equal to or smaller than the specific value, detecting the first type of PDCCH is skipped in the specific subframe.
1. A method for receiving a signal by a user equipment in a wireless communication system using Time Division Duplex (TDD), the method comprising:
determining a subframe configuration for a specific subframe comprising a downlink period, a guard period, and an uplink period, each length of the downlink period, the guard period, and the uplink period being given according to the subframe configuration; and
when the determined subframe configuration is a first subframe configuration, performing a detection of a first-type physical downlink control channel (PDCCH) in the specific subframe,
wherein, when the determined subframe configuration is a second subframe configuration, the detection of the first-type PDCCH is not performed in the specific subframe,
wherein the first-type PDCCH indicates a PDCCH configured within a resource region from a specific orthogonal frequency division multiplexing (OFDM) symbol other than a starting OFDM symbol in a subframe.
2. The method of claim 1 , wherein, for a normal cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the subframe configuration:
Subframe
Length of downlink period
Configuration
(the number of OFDM symbols)
0
3
1
9
2
10
3
11
4
12
5
3
6
9
7
10
8
11
9
6.
3. The method of claim 2 , wherein the first subframe configuration corresponds to subframe configuration 0 or 5.
4. The method of claim 2 , wherein the second subframe configuration corresponds to subframe configuration 1, 2, 3, 4, 6, or 9.
5. The method of claim 1 , wherein, for an extended cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the subframe configuration:
Subframe
Length of downlink period
Configuration
(the number of OFDM symbols)
0
3
1
8
2
9
3
10
4
3
5
8
6
9
7
5.
6. The method of claim 5 , wherein the first subframe configuration corresponds to subframe configuration 0, 4, or 7.
7. The method of claim 5 , wherein the second subframe configuration corresponds to subframe configuration 1, 2, 3, 5, or 6.
8. The method of claim 1 , further comprising:
performing a detection of a second-type PDCCH in the specific subframe,
wherein the second-type PDCCH indicates a PDCCH configured within a resource region from the starting OFDM symbol before the specific OFDM symbol in a subframe.
9. The method of claim 1 , wherein a position of the specific OFDM symbol within the subframe is indicated through a radio resource control (RRC) signaling or through a physical control format indicator channel (PCFICH).
10. A communication device configured to operate in a wireless communication system using Time Division Duplex (TDD), the communication device comprising:
a radio frequency (RF) unit; and
a processor operatively connected to the RF unit and configured to:
determine a subframe configuration for a specific subframe comprising a downlink period, a guard period, and an uplink period, each length of the downlink period, the guard period, and the uplink period being given according to the subframe configuration, and
when the determined subframe configuration is a first subframe configuration, perform a detection of a first-type physical downlink control channel (PDCCH) in the specific subframe,
wherein, when the determined subframe configuration is a second subframe configuration, the detection of the first-type PDCCH is not performed in the specific subframe,
wherein the first-type PDCCH indicates a PDCCH configured within a resource region from a specific orthogonal frequency division multiplexing (OFDM) symbol other than a starting OFDM symbol in a subframe.
11. The communication device of claim 10 , wherein, for a normal cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the subframe configuration:
Subframe
Length of downlink period
Configuration
(the number of OFDM symbols)
0
3
1
9
2
10
3
11
4
12
5
3
6
9
7
10
8
11
9
6.
12. The communication device of claim 11 , wherein the first subframe configuration corresponds to subframe configuration 0 or 5.
13. The communication device of claim 11 , wherein the second subframe configuration corresponds to subframe configuration 1, 2, 3, 4, 6, 7, 8, or 9.
14. The communication device of claim 10 , wherein, for an extended cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the subframe configuration:
Subframe
Length of downlink period
Configuration
(the number of OFDM symbols)
0
3
1
8
2
9
3
10
4
3
5
8
6
9
7
5.
15. The communication device of claim 14 , wherein the first subframe configuration corresponds to subframe configuration 0, 4, or 7.
16. The communication device of claim 14 , wherein the second subframe configuration corresponds to subframe configuration 1, 2, 3, 5, or 6.
17. The communication device of claim 10 , wherein the processor is further configured to perform a detection of a second-type PDCCH in the specific subframe,
wherein the second-type PDCCH indicates a PDCCH configured within a resource region from the starting OFDM symbol before the specific OFDM symbol in a subframe.
18. The communication device of claim 10 , wherein a position of the specific OFDM symbol within the subframe is indicated through a radio resource control (RRC) signaling or through a physical control format indicator channel (PCFICH).