Information transmission method and communications apparatus
This application provides an information transmission method and a communications apparatus. The method includes: receiving downlink control information DCI, where the DCI includes indication information, the indication information indicates at least one demodulation reference signal DMRS antenna port group and layer information of downlink data, the at least one DMRS antenna port group is one or more of a plurality of DMRS antenna port groups, and DMRS antenna ports in a same DMRS antenna port group satisfy a quasi co-location QCL relationship; and determining, based on the indication information, a DMRS antenna port occupied by the downlink data. According to embodiments of this application, a DMRS antenna port can be indicated when DMRS antenna ports are grouped.
1. A communication method, comprising:
receiving indication information and quasi co-location (QCL) information, wherein the indication information indicates a total quantity N of layers of downlink data and N demodulation reference signal (DMRS) antenna ports, and the QCL information indicates a QCL type, wherein N is a positive integer; and
determining, based on the QCL information and the indication information, the total quantity N of layers of downlink data and a DMRS antenna port occupied by the downlink data, wherein the QCL information indicates a QCL type C, and at least one of the following occurs:
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table A, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table A is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
1
2 layers, ports 7 and 8, n_SCID = 1
2
3 layers, ports 7, 9, and 10
3
4 layers, ports 7 to 10
4
5 layers, ports 7, 8, 9, 10, and 12
5
6 layers, ports 7, 8, 11, 9, 10, and 12
6
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
7
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
or
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table B, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table B is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 2)
1
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 2)
2
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 4)
3
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 4)
4
2 layers, ports 11 and 13, n_SCID = 0
(OCC = 4)
5
2 layers, ports 11 and 13, n_SCID = 1
(OCC = 4)
6
3 layers, ports 7, 9, and 10
7
4 layers, ports 7 to 10
8
5 layers, ports 7, 8, 9, 10, and 12
9
6 layers, ports 7, 8, 11, 9, 10, and 12
10
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
11
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
12
Reserved
13
Reserved
14
Reserved
15
Reserved
or
the indication information indicating a total quantity N of layers of downlink data and N DMRS antenna ports comprises:
the indication information indicating that the total quantity of layers of downlink data is 3, and the DMRS antenna ports are antenna ports 7, 9, and 10 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 5, and the DMRS antenna ports are antenna ports 7, 8, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 6, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 7, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, 12, and 14 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 8, and the DMRS antenna ports are antenna ports 7, 8, 11, 13, 9, 10, 12, and 14 in sequence.
2. The method according to claim 1 , wherein the indication information is configured by higher layer signaling.
3. The method according to claim 1 , wherein the N DMRS antenna ports indicated by the indication information are N non-sequentially numbered DMRS antenna ports corresponding to sequentially numbered layers, and N is one of 3, 5, 6, 7, or 8.
4. A communication method, comprising:
generating indication information and quasi co-location (QCL) information, wherein the indication information indicates a total quantity N of layers of downlink data and N demodulation reference signal (DMRS) antenna ports, and the QCL information indicates a QCL type, wherein N is a positive integer; and
sending the indication information and the quasi co-location QCL information, wherein the QCL information indicates a QCL type C, and at least one of the following occurs:
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table A, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table A is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
1
2 layers, ports 7 and 8, n_SCID = 1
2
3 layers, ports 7, 9, and 10
3
4 layers, ports 7 to 10
4
5 layers, ports 7, 8, 9, 10, and 12
5
6 layers, ports 7, 8, 11, 9, 10, and 12
6
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
7
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
or
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table B, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table B is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 2)
1
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 2)
2
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 4)
3
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 4)
4
2 layers, ports 11 and 13, n_SCID = 0
(OCC = 4)
5
2 layers, ports 11 and 13, n_SCID = 1
(OCC = 4)
6
3 layers, ports 7, 9, and 10
7
4 layers, ports 7 to 10
8
5 layers, ports 7, 8, 9, 10, and 12
9
6 layers, ports 7, 8, 11, 9, 10, and 12
10
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
11
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
12
Reserved
13
Reserved
14
Reserved
15
Reserved
or
the indication information indicating a total quantity N of layers of downlink data and N DMRS antenna ports comprises:
the indication information indicating that the total quantity of layers of downlink data is 3, and the DMRS antenna ports are antenna ports 7, 9, and 10 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 5, and the DMRS antenna ports are antenna ports 7, 8, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 6, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 7, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, 12, and 14 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 8, and the DMRS antenna ports are antenna ports 7, 8, 11, 13, 9, 10, 12, and 14 in sequence.
5. The method according to claim 4 , wherein the indication information is configured by higher layer signaling.
6. The method according to claim 4 , wherein the N DMRS antenna ports indicated by the indication information are N non-sequentially numbered DMRS antenna ports corresponding to sequentially numbered layers, and N is one of 3, 5, 6, 7, or 8.
7. A communications apparatus, comprising one or more processors and a memory coupled to the one or more processors, wherein the memory stores programming instructions that when executed by the one or more processors, cause the communications apparatus to perform the following:
receiving indication information and quasi co-location (QCL) information, wherein the indication information indicates a total quantity N of layers of downlink data and N demodulation reference signal (DMRS) antenna ports, and the QCL information indicates a QCL type, wherein N is a positive integer; and
determining, based on the QCL information and the indication information, the total quantity N of layers of downlink data and a DMRS antenna port occupied by the downlink data, wherein the QCL information indicates a QCL type C, and at least one of the following occurs:
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table A, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table A is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
1
2 layers, ports 7 and 8, n_SCID = 1
2
3 layers, ports 7, 9, and 10
3
4 layers, ports 7 to 10
4
5 layers, ports 7, 8, 9, 10, and 12
5
6 layers, ports 7, 8, 11, 9, 10, and 12
6
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
7
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
or
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table B, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table B is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 2)
1
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 2)
2
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 4)
3
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 4)
4
2 layers, ports 11 and 13, n_SCID = 0
(OCC = 4)
5
2 layers, ports 11 and 13, n_SCID = 1
(OCC = 4)
6
3 layers, ports 7, 9, and 10
7
4 layers, ports 7 to 10
8
5 layers, ports 7, 8, 9, 10, and 12
9
6 layers, ports 7, 8, 11, 9, 10, and 12
10
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
11
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
12
Reserved
13
Reserved
14
Reserved
15
Reserved
or
the indication information indicating a total quantity N of layers of downlink data and N DMRS antenna ports comprises:
the indication information indicating that the total quantity of layers of downlink data is 3, and the DMRS antenna ports are antenna ports 7, 9, and 10 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 5, and the DMRS antenna ports are antenna ports 7, 8, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 6, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 7, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, 12, and 14 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 8, and the DMRS antenna ports are antenna ports 7, 8, 11, 13, 9, 10, 12, and 14 in sequence.
8. The apparatus according to claim 7 , wherein the indication information is configured by higher layer signaling.
9. The apparatus according to claim 7 , wherein the N DMRS antenna ports indicated by the indication information are N non-sequentially numbered DMRS antenna ports corresponding to sequentially numbered layers, and N is one of 3, 5, 6, 7, or 8.
10. A communications apparatus, comprising one or more processors and a memory coupled to the one or more processors, wherein the memory stores programming instructions that when executed by the one or more processors, cause the communications apparatus to perform the following:
generating indication information and quasi co-location (QCL) information, wherein the indication information indicates a total quantity N of layers of downlink data and N demodulation reference signal (DMRS) antenna ports, and the QCL information indicates a QCL type, wherein N is a positive integer; and
sending the indication information and the quasi co-location QCL information, wherein the QCL information indicates a QCL type C, and at least one of the following occurs:
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table A, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table A is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
1
2 layers, ports 7 and 8, n_SCID = 1
2
3 layers, ports 7, 9, and 10
3
4 layers, ports 7 to 10
4
5 layers, ports 7, 8, 9, 10, and 12
5
6 layers, ports 7, 8, 11, 9, 10, and 12
6
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
7
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
or
there is a correspondence between the indication information and one of a plurality of pieces of combination information, the correspondence satisfies one of correspondences between the indication information and the combination information in the following Table B, and the combination information comprises the total quantity N of layers of downlink data and information about the N DMRS antenna ports, wherein Table B is:
Two codewords
(Two codewords: Codeword 0 enabled, Codeword 1 enabled)
Value (value) of
indication information
Combination information (message)
0
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 2)
1
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 2)
2
2 layers, ports 7 and 8, n_SCID = 0
(OCC = 4)
3
2 layers, ports 7 and 8, n_SCID = 1
(OCC = 4)
4
2 layers, ports 11 and 13, n_SCID = 0
(OCC = 4)
5
2 layers, ports 11 and 13, n_SCID = 1
(OCC = 4)
6
3 layers, ports 7, 9, and 10
7
4 layers, ports 7 to 10
8
5 layers, ports 7, 8, 9, 10, and 12
9
6 layers, ports 7, 8, 11, 9, 10, and 12
10
7 layers, ports 7, 8, 11, 9, 10, 12, and 14
11
8 layers, ports 7, 8, 11, 13, 9, 10, 12, and 14
12
Reserved
13
Reserved
14
Reserved
15
Reserved
or
the indication information indicating a total quantity N of layers of downlink data and N DMRS antenna ports comprises:
the indication information indicating that the total quantity of layers of downlink data is 3, and the DMRS antenna ports are antenna ports 7, 9, and 10 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 5, and the DMRS antenna ports are antenna ports 7, 8, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 6, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, and 12 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 7, and the DMRS antenna ports are antenna ports 7, 8, 11, 9, 10, 12, and 14 in sequence; or
the indication information indicating that the total quantity of layers of downlink data is 8, and the DMRS antenna ports are antenna ports 7, 8, 11, 13, 9, 10, 12, and 14 in sequence.