Method and apparatus for decoding downlink control information by terminal in wireless communication system
The present invention provides a method and an apparatus for decoding downlink control information (DCI) by a terminal in a wireless communication system established with different types of serving cells. The method comprises: receiving, via a first cell, a DCI for scheduling a second cell; and decoding the DCI, wherein the decoding the DCI comprises determining the size of the DCI depending on whether the second cell is the same type of cell as the first cell.
1. A method for transmitting data, the method performed by a user equipment (UE), which is configured with a first cell and a second cell, and comprising:
receiving, through the first cell, downlink control information (DCI) which schedules an uplink transmission at the first cell or the second cell; and
transmitting the data scheduled by the DCI through the first cell or the second cell,
wherein the first cell is a cell based on a frequency division duplex (FDD) frame and the second cell is a cell based on a time division duplex (TDD) frame,
wherein when the DCI schedules an uplink transmission at the first cell, no uplink index field is included in the DCI,
wherein when the DCI schedules an uplink transmission at the second cell and when an uplink-downlink configuration of the second cell is uplink-downlink configuration 0 of below table, an uplink index field consisting of 2 bits is included in the DCI:
Uplink-downlink
Subframe n
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, and
wherein, in above table, D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe.
2. The method of claim 1 , wherein the first cell is a primary cell that performs an initial connection establishment procedure or a connection reestablishment procedure, and the second cell is a secondary cell which is additionally allocated in addition to the primary cell.
3. The method of claim 1 , wherein the uplink index field is used to indicate a corresponding uplink subframe scheduled by the DCI.
4. The method of claim 1 , wherein the DCI includes a specific field having a varying bit size depending on whether a cell scheduled by the DCI is a cell based on the FDD frame or a cell based on the TDD frame.
5. The method of claim 1 , wherein the uplink index field consisting of 2 bits is not included in the DCI when the uplink-downlink configuration of the second cell is uplink-downlink configuration 1, 2, 3, 4, 5 or 6 of the table.
6. An apparatus, comprising:
a transceiver configured to transmit and receive a radio signal; and
a processor connected to the transceiver, and configured to:
control the transceiver to receive, through a first cell, downlink control information (DCI) which schedules an uplink transmission at the first cell or a second cell, and
control the transceiver to transmit data scheduled by the DCI through the first cell or the second cell,
wherein the first cell is a cell based on a frequency division duplex (FDD) frame and the second cell is a cell based on a time division duplex (TDD) frame, and
wherein when the DCI schedules an uplink transmission at the first cell, no uplink index field is included in the DCI,
wherein when the DCI schedules an uplink transmission at the second cell and when an uplink-downlink configuration of the second cell is uplink-downlink configuration 0 of below table, an uplink index field consisting of 2 bits is included in the DCI:
Uplink-downlink
Subframe n
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, and
wherein, in above table, D denotes a downlink subframe, S denotes a special subframe, and U denotes an uplink subframe.
7. The apparatus of claim 6 , wherein the first cell is a primary cell that performs an initial connection establishment procedure or a connection reestablishment procedure, and the second cell is a secondary cell which is additionally allocated in addition to the primary cell.
8. The apparatus of claim 6 , wherein the uplink index field is used to indicate a corresponding uplink subframe scheduled by the DCI.
9. The apparatus of claim 6 , wherein the DCI includes a specific field having a varying bit size depending on whether a cell scheduled by the DCI is a cell based on the FDD frame or a cell based on the TDD frame.
10. The apparatus of claim 6 , wherein the uplink index field consisting of 2 bits is not included in the DCI when the uplink-downlink configuration of the second cell is uplink-downlink configuration 1, 2, 3, 4, 5 or 6 of the table.