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 performed by a user equipment (UE) in a wireless communication system using Time Division Duplex (TDD), the method comprising:
configuring 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 a specific subframe configuration for the configured specific subframe,
wherein, for a normal cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the specific subframe configuration for the configured specific subframe,
Specific 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
wherein a detection of a physical downlink control channel (PDCCH) in a resource region from a specific OFDM symbol other than a starting OFDM symbol within the configured specific subframe is not performed by the UE for subframe configuration 0 and 5 .
2. The method according to claim 1 , wherein a demodulation reference signal (DMRS) transmission is not allowed for subframe configuration 0 or 5 .
3. The method according to claim 1 , wherein, for an extended CP in downlink, the length of the downlink period is given by a following table according to the specific subframe configuration:
Specific 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.
4. The method according to claim 3 , wherein, for the extended CP in downlink, a demodulation reference signal (DMRS) transmission is not allowed for subframe configuration 0 , 4 , or 7 .
5. The method according to claim 3 , wherein, for the extended CP in downlink, the detection of the PDCCH in the resource region of the configured specific subframe is not performed by the UE for subframe configuration 0 , 4 , or 7 .
6. The method according to claim 1 , wherein the PDCCH is an E-PDCCH (Enhanced PDCCH).
7. The method according to claim 6 , wherein a position of the specific OFDM symbol within the configured specific subframe is indicated through a radio resource control (RRC) signaling or through a physical control format indicator channel (PCFICH).
8. A user equipment (UE) configured to operate in a wireless communication system using Time Division Duplex (TDD), the UE comprising:
a radio frequency (RF) unit; and
a processor operatively connected to the RF unit and configured to:
configure 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 a specific subframe configuration for the configured specific subframe, and
wherein, for a normal cyclic prefix (CP) in downlink, the length of the downlink period is given by a following table according to the specific subframe configuration for the configured specific subframe,
Specific 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
wherein a detection of a physical downlink control channel (PDCCH) in a resource region from a specific OFDM symbol other than a starting OFDM symbol within the configured specific subframe is not performed by the UE for subframe configuration 0 and 5 .
9. The UE according to claim 8 , wherein a demodulation reference signal (DMRS) transmission is not allowed for subframe configuration 0 or 5 .
10. The UE according to claim 8 , wherein, for an extended CP in downlink, the length of the downlink period is given by a following table according to the specific subframe configuration:
Specific 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.
11. The UE according to claim 10 , wherein, for the extended CP in downlink, a demodulation reference signal (DMRS) transmission is not allowed for subframe configuration 0 , 4 , or 7 .
12. The UE according to claim 10 , wherein, for the extended CP in downlink, the detection of the PDCCH in the resource region of the configured specific subframe is not performed by the UE for subframe configuration 0 , 4 , or 7 .
13. The UE according to claim 8 , wherein the PDCCH is an E-PDCCH (Enhanced PDCCH).
14. The UE according to claim 13 , wherein a position of the specific OFDM symbol within the configured specific subframe is indicated through a radio resource control (RRC) signaling or through a physical control format indicator channel (PCFICH).