Method and apparatus for uplink signal transmission based on codebook in a wireless communication system
A method for transmitting an uplink signal based on a codebook by a UE in a wireless communication system includes: receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; determining the precoding matrix applied to the transmission of the uplink signal from a codebook subset related to the transmission of the uplink signal based on the DCI; and transmitting, to the base station, the uplink signal based on the determined precoding matrix, I which based on that a difference between phase values applied to antenna ports for the transmission of the uplink signal is maintained in some antenna ports among all antenna port pairs, the codebook subset includes at least one specific precoding matrix applying different phase values to antenna ports included in all or some of the some antenna ports.
1. A method for transmitting an uplink signal based on a codebook by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal;
determining the precoding matrix applied to the transmission of the uplink signal, wherein the precoding matrix is determined from a codebook subset related to the transmission of the uplink signal based on the DCI; and
transmitting, to the base station, the uplink signal based on the determined precoding matrix,
wherein based on that the codebook subset is set to partialAndNonCoherent, the codebook subset includes at least one specific precoding matrix comprising non zero values for all antenna ports for the transmission of the uplink signal, and
wherein the at least one specific precoding matrix is related to rank 1 uplink transmission using 4 antenna ports.
2. The method of claim 1 , wherein the at least one specific precoding matrix further comprises relative phase difference between two antenna ports each included in some or all of some antenna port pairs related to a UE coherence capability of the partialAndNonCoherent among all antenna port pairs.
3. The method of claim 1 , wherein the codebook subset further includes at least one precoding matrix comprising non zero values for part of the all antenna ports for the transmission of the uplink signal, and
wherein based on that the determined precoding matrix is one precoding matrix among the at least one specific precoding matrix, the uplink signal is transmitted based on full power transmission through all of the antenna ports for transmitting the uplink signal.
4. The method of claim 3 , further comprising:
determining uplink transmission power for the uplink transmission based on the DCI,
wherein the DCI further includes information on an optimal power level for the uplink transmission, and
wherein the determined uplink transmission power is divided into a same value and applied across all of the antenna ports for the transmission of the uplink signal.
5. The method of claim 3 , wherein the codebook includes a first codebook for rank 1 using four antenna ports for transmitting the uplink signal,
wherein the codebook subset is configured based on precoding matrices included in the first codebook, and
wherein each of the precoding matrices included in the first codebook is indexed by a transmit precoding matrix indicator (TPMI) index.
6. The method of claim 5 , wherein the first codebook is determined by one of the following tables, and
TABLE
TPMI index
W (ordered from left to right in increasing order of TPMI index)
0-7
1
2
[
1
0
0
0
]
1
2
[
0
1
0
0
]
1
2
[
0
0
1
0
]
1
2
[
0
0
0
1
]
1
2
[
1
0
1
0
]
1
2
[
1
0
-
1
0
]
1
2
[
1
0
j
0
]
1
2
[
1
0
-
j
0
]
8-15
1
2
[
0
1
0
1
]
1
2
[
0
1
0
-
1
]
1
2
[
0
1
0
j
]
1
2
[
0
1
0
-
j
]
1
2
[
1
1
1
-
1
]
1
2
[
1
1
j
j
]
1
2
[
1
1
-
1
1
]
1
2
[
1
1
-
j
-
j
]
16-23
1
2
[
1
j
1
j
]
1
2
[
1
j
j
1
]
1
2
[
1
j
-
1
-
j
]
1
2
[
1
j
-
j
-
1
]
1
2
[
1
-
1
1
1
]
1
2
[
1
-
1
j
-
j
]
1
2
[
1
-
1
-
1
-
1
]
1
2
[
1
-
1
-
j
j
]
24-27
1
2
[
1
-
j
1
-
j
]
1
2
[
1
-
j
j
-
1
]
1
2
[
1
-
j
-
1
j
]
1
2
[
1
-
j
-
j
1
]
—
—
—
—
TABLE
TPMI index
W (ordered from left to right in increasing order of TPMI index)
0-7
1
2
[
1
0
0
0
]
1
2
[
0
1
0
0
]
1
2
[
0
0
1
0
]
1
2
[
0
0
0
1
]
1
2
[
1
0
1
0
]
1
2
[
1
0
-
1
0
]
1
2
[
1
0
j
0
]
1
2
[
1
0
-
j
0
]
8-15
1
2
[
0
1
0
1
]
1
2
[
0
1
0
-
1
]
1
2
[
0
1
0
j
]
1
2
[
0
1
0
-
j
]
1
2
[
1
1
1
1
]
1
2
[
1
1
j
j
]
1
2
[
1
1
-
1
-
1
]
1
2
[
1
1
-
j
-
j
]
16-23
1
2
[
1
j
1
j
]
1
2
[
1
j
j
-
1
]
1
2
[
1
j
-
1
-
j
]
1
2
[
1
j
-
j
1
]
1
2
[
1
-
1
1
-
1
]
1
2
[
1
-
1
j
-
j
]
1
2
[
1
-
1
-
1
1
]
1
2
[
1
-
1
-
j
j
]
24-27
1
2
[
1
-
j
1
-
j
]
1
2
[
1
-
j
j
1
]
1
2
[
1
-
j
-
1
j
]
1
2
[
1
-
j
-
j
-
1
]
—
—
—
—
wherein the TPMI index is indexed according to ascending order from a left side to a right side of the table with respect to the precoding matrices included in the first codebook.
7. The method of claim 6 , wherein the at least one specific precoding matrix is a precoding matrix in which the TPMI index is 12 to 15 among the precoding matrices included in the first codebook.
8. The method of claim 6 , wherein the at least one specific precoding matrix is a precoding matrix in which the TPMI index is 12, 17, 22, and 27 among the precoding matrices included in the first codebook.
9. The method of claim 6 , further comprising:
receiving, from the base station, configuration information for a maximum rank value for the transmission of the uplink signal.
10. The method of claim 9 , wherein a configuration of the precoding matrices included in the codebook subset varies based on the maximum rank value.
11. The method of claim 10 , wherein based on that the maximum rank value is 4, the codebook subset includes precoding matrices in which the TPMI index is 4 to 15 among the precoding matrices included in the first codebook.
12. The method of claim 10 , wherein based on that the maximum rank value is 1, the codebook subset includes precoding matrices in which the TPMI index is 1 to 15 among the precoding matrices included in the first codebook.
13. The method of claim 5 , wherein the codebook further includes (i) a second codebook for rank 2 using four antenna ports for transmitting the uplink signal, (ii) a third codebook for rank 3 using four antenna ports for transmitting the uplink signal, and (iii) a fourth codebook for rank 4 using four antenna ports for transmitting the uplink signal, and
wherein the codebook subset is configured further based on the precoding matrices respectively included in the second to fourth codebooks.
14. The method of claim 13 , wherein the third codebook is determined by the following table,
TABLE
TPMI index
W (ordered from left to right in increasing order of TPMI index)
0-3
1
2
[
1
0
0
0
1
0
0
0
1
0
0
0
]
1
2
[
1
0
0
0
1
0
1
0
0
0
0
1
]
1
2
[
1
0
0
0
1
0
-
1
0
0
0
0
1
]
1
2
3
[
1
1
1
1
-
1
1
1
1
-
1
1
-
1
-
1
]
4-6
1
2
3
[
1
1
1
1
-
1
1
j
j
-
j
j
-
j
-
j
]
1
2
3
[
1
1
1
-
1
1
-
1
1
1
-
1
-
1
1
1
]
1
2
3
[
1
1
1
-
1
1
-
1
j
j
-
j
-
j
j
j
]
—
wherein the fourth codebook is determined by the following table, and
TABLE
TPMI index
W (ordered from left to right in increasing order of TPMI index)
0-3
1
2
[
1
0
0
0
0
1
0
0
0
0
1
0
0
0
0
1
]
1
2
2
[
1
1
0
0
0
0
1
1
1
-
1
0
0
0
0
1
-
1
]
1
2
2
[
1
1
0
0
0
0
1
1
j
-
j
0
0
0
0
j
-
j
]
1
4
[
1
1
1
1
1
-
1
1
-
1
1
1
-
1
-
1
1
-
1
-
1
1
]
4
1
4
[
1
1
1
1
1
-
1
1
-
1
j
j
-
j
-
j
j
-
j
-
j
j
]
—
—
—
wherein the TPMI index is indexed according to ascending order from a left side to a right side of the table with respect to the precoding matrices respectively included in the third codebook and the fourth codebook.
15. The method of claim 14 , wherein the codebook subset further includes (i) a precoding matrix in which the TPMI index is 1 among the precoding matrices included in the third codebook and (ii) a precoding matrix in which the TPMI index is 0 among the precoding matrices included in the fourth codebook.
16. A user equipment (UE) configured to transmit an uplink signal based on a codebook in a wireless communication system, the UE comprising:
a transmitter;
a receiver; and
a processor functionally connected to the transmitter and the receiver,
wherein the processor is configured to:
control the receiver to receive, from a base station, downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal,
control to determine the precoding matrix applied to the transmission of the uplink signal, wherein the precoding matrix is determined from a codebook subset related to the transmission of the uplink signal based on the DCI, and
control the transmitter to transmit, to the base station, the uplink signal based on the determined precoding matrix, and
wherein based on that the codebook subset is set to partialAndNonCoherent, the codebook subset includes at least one specific precoding matrix comprising non zero values for all antenna ports for the transmission of the uplink signal, and
wherein the at least one specific precoding matrix is related to rank 1 uplink transmission using 4 antenna ports.
17. A method for receiving an uplink signal based on a codebook by a base station in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE), downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal; and
receiving, from the UE, the uplink signal based on the precoding matrix determined based on the DCI,
wherein based on that the codebook subset is set to partialAndNonCoherent, the codebook subset includes at least one specific precoding matrix comprising non zero values for all antenna ports for the transmission of the uplink signal, and
wherein the at least one specific precoding matrix is related to rank 1 uplink transmission using 4 antenna ports.
18. A base station configured to receive an uplink signal based on a codebook in a wireless communication system, the base station comprising:
a transmitter;
a receiver; and
a processor functionally connected to the transmitter and the receiver,
wherein the processor is configured to:
control the transmitter to transmit, to a user equipment (UE), downlink control information (DCI) for determining a precoding matrix applied to transmission of the uplink signal, and
control the receiver to receive, from the UE, the uplink signal based on the precoding matrix determined based on the DCI, and
wherein based on that the codebook subset is set to partialAndNonCoherent, the codebook subset includes at least one specific precoding matrix comprising non zero values for all antenna ports for the transmission of the uplink signal, and
wherein the at least one specific precoding matrix is related to rank 1 uplink transmission using 4 antenna ports.
19. The method of claim 2 , wherein the UE coherence capability is the partialAndNonCoherent, and
wherein the UE coherence capability of the partialAndNonCoherent is that the relative phase difference between the two antenna ports each included in some or all of the some antenna port pairs is maintained.
20. The method of claim 2 , wherein the all antenna ports for the transmission of the uplink signal is numbered as antenna port 0, antenna port 1, antenna port 2 and antenna port 3,
wherein the some antenna port pairs related to the UE coherent capability of the partialAndNonCoherent among the all antenna port pairs are pair of (antenna port 0, antenna port 2) and (antenna port 1, antenna port 3), and
wherein the some of the some antenna port pairs related to the UE coherent capability of the partialAndNonCoherent among the all antenna port pairs is the pair of (antenna port 0, antenna port 2) or the pair of (antenna port 1, antenna port 3).