Method for transmitting/receiving data in a wireless access system and base station for same
A method is provided for receiving a signal by a user equipment (UE) using time division duplex (TDD) in a wireless communication system. The UE receives uplink (UL) grant information on a first cell, the UL grant information scheduling a UL transmission on a second cell. The UE transmits UL data in a UL subframe on the second cell via a physical UL shared channel based on the UL grant information. The UE receives hybrid automatic repeat and request acknowledgement (HARQ-ACK) information in a downlink (DL) subframe on the first cell. The first cell and the second cell have different TDD UL-DL configurations. The DL subframe on the first cell is determined based on a TDD UL-DL configuration of the second cell.
1. A method for receiving a signal by a user equipment (UE) using time division duplex (TDD) in a wireless communication system, the method comprising:
receiving, by the UE, uplink (UL) grant information on a first cell, the UL grant information scheduling a UL transmission on a second cell;
transmitting, by the UE, UL data in a UL subframe on the second cell via a physical UL shared channel based on the UL grant information; and
receiving, by the UE, hybrid automatic repeat and request acknowledgement (HARQ-ACK) information in a downlink (DL) subframe on the first cell,
wherein the first cell and the second cell have different TDD UL-DL configurations, and
wherein the DL subframe on the first cell is determined based on a TDD UL-DL configuration of the second cell.
2. The method according to claim 1 , wherein when the UL subframe is a subframe n and the DL subframe is a subframe n+k, a timing relation k between the UL subframe and the DL subframe is given based on the TDD UL-DL configuration of the second cell according to the following table:
TDD UL-DL
subframe number n
Configuration
0
1
2
3
4
5
6
7
8
9
0
4
7
6
4
7
6
1
4
6
4
6
2
6
6
3
6
6
6
4
6
6
5
6
6
4
6
6
4
7.
3. The method according to claim 1 , wherein when the UL grant information is received in a subframe n and the UL data is transmitted in a subframe n+k, a timing relation k is given based on the TDD UL-DL configuration of the second cell according to the following table:
TDD UL-DL
subframe number n
Configuration
0
1
2
3
4
5
6
7
8
9
0
4
6
4
6
1
6
4
6
4
2
4
4
3
4
4
4
4
4
4
5
4
6
7
7
7
7
5.
4. The method according to claim 1 , wherein subframe configuration on each of the first cell and the second cell is given based on a TDD UL-DL configuration of a corresponding cell according to the following table:
TDD 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 U denotes a UL subframe, D denotes a DL subframe, and S denotes a subframe comprising a DL period, a guard period, and a UL period.
5. The method according to claim 1 , wherein the UL grant information is received via a physical DL control channel.
6. The method according to claim 1 , wherein the HARQ-ACK information is received via a physical HARQ indicator channel.
7. The method according to claim 1 , wherein the UE is configured with a plurality of cells including the first cell and the second cell, each of the first cell and the second cell operating in TDD.
8. A user equipment (UE) configured to receive a signal using time division duplex (TDD) in a wireless communication system, the UE comprising:
a radio frequency (RF) unit; and
a processor operatively connected to the RF unit and configured to:
receive uplink (UL) grant information on a first cell through the RF unit, the UL grant information scheduling a UL transmission on a second cell,
transmit UL data in a UL subframe on the second cell via a physical UL shared channel based on the UL grant information through the RF unit,
receive hybrid automatic repeat and request acknowledgement (HARQ-ACK) information in a downlink (DL) subframe on the first cell through the RF unit,
wherein the first cell and the second cell have different TDD UL-DL configurations, and
wherein the DL subframe on the first cell is determined based on a TDD UL-DL configuration of the second cell.
9. The user equipment according to claim 8 , wherein when the UL subframe is a subframe n and the DL subframe is a subframe n+k, a timing relation k between the UL subframe and the DL subframe is given based on the TDD UL-DL configuration of the second cell according to the following table:
TDD UL-DL
subframe number n
Configuration
0
1
2
3
4
5
6
7
8
9
0
4
7
6
4
7
6
1
4
6
4
6
2
6
6
3
6
6
6
4
6
6
5
6
6
4
6
6
4
7.
10. The user equipment according to claim 8 , wherein when the UL grant information is received in a subframe n and the UL data is transmitted in a subframe n+k, a timing relation k is given based on the TDD UL-DL configuration of the second cell according to the following table:
TDD UL-DL
subframe number n
Configuration
0
1
2
3
4
5
6
7
8
9
0
4
6
4
6
1
6
4
6
4
2
4
4
3
4
4
4
4
4
4
5
4
6
7
7
7
7
5.
11. The user equipment according to claim 8 , wherein subframe configuration on each of the first cell and the second cell is given based on a TDD UL-DL configuration of a corresponding cell according to the following table:
TDD 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 U denotes a UL subframe, D denotes a DL subframe, and S denotes a subframe comprising a DL period, a guard period, and a UL period.
12. The user equipment according to claim 8 , wherein the UL grant information is received via a physical DL control channel.
13. The user equipment according to claim 8 , wherein the HARQ-ACK information is received via a physical HARQ indicator channel.
14. The user equipment according to claim 8 , wherein the UE is configured with a plurality of cells including the first cell and the second cell, each of the first cell and the second cell operating in TDD.