Method for reporting and receiving channel state information, and device

1. A method for reporting channel state information, the method comprising:

acquiring reference signal resource configuration information, wherein the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure;

receiving, according to the reference signal resource configuration information, a reference signal sent by a base station;

selecting a precoding matrix from a codebook based on the received reference signal, wherein a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure; and

reporting a precoding matrix indicator (PMI) to the base station, wherein the PMI is used to indicate the selected precoding matrix.

2. The method according to claim 1 , wherein:

the PMI comprises a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 ; and

reporting the precoding matrix indicator (PMI) to the base station comprises:

separately reporting the first PMI and the second PMI to the base station.

3. A method for receiving channel state information, the method comprising:

sending a reference signal to user equipment based on reference signal resource configuration information, the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure; and

receiving a precoding matrix indicator (PMI) reported by the user equipment, wherein the PMI is used to indicate a precoding matrix selected by the user equipment, the precoding matrix is selected by the user equipment from a codebook based on the reference signal, and a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure.

4. The method according to claim 3 , wherein:

the PMI comprises a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 ; and

receiving the precoding matrix indicator (PMI) reported by the user equipment comprises:

separately receiving the first PMI and the second PMI that are reported by the user equipment.

5. User equipment, comprising:

a processor, a receiver, and a transmitter;

wherein the processor is configured to:

acquire reference signal resource configuration information, wherein the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure; and

select a precoding matrix from a codebook based on a reference signal received by the receiver, wherein a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure;

wherein the receiver is configured to receive, according to the reference signal resource configuration information acquired by the processor, the reference signal sent by a base station; and

wherein the transmitter is configured to report a precoding matrix indicator (PMI) to the base station, wherein the PMI is used to indicate the precoding matrix selected by the processor.

6. The user equipment according to claim 5 , wherein:

the PMI comprises a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 ; and

the transmitter is configured to separately report the first PMI and the second PMI to the base station.

7. A base station, comprising:

a transmitter, configured to send a reference signal to user equipment based on reference signal resource configuration information, the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure; and

a receiver, configured to receive a precoding matrix indicator (PMI) reported by the user equipment, wherein the PMI is used to indicate a precoding matrix selected by the user equipment, the precoding matrix is selected by the user equipment from a codebook based on the reference signal, and a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and)(m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure.

8. The base station according to claim 7 , wherein:

the PMI comprises a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 ; and

the receiver is configured to separately receive the first PMI and the second PMI that are reported by the user equipment.

9. An apparatus configured to report channel state information, the apparatus comprising:

a processor; and

a memory, coupled to the processor, storing instructions that, when executed by the processor, cause the processor to:

acquire reference signal resource configuration information, wherein the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure,

receive, according to the reference signal resource configuration information, a reference signal sent by a base station,

select a precoding matrix from a codebook based on the received reference signal, wherein a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure, and

report a precoding matrix indicator (PMI) to the base station, wherein the PMI is used to indicate the selected precoding matrix.

10. The apparatus of claim 9 , wherein reporting the PMI to the base station comprises:

separately reporting a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 to the base station.

11. An apparatus configured to receive channel state information, the apparatus comprising:

a processor; and

a memory, coupled to the processor, storing instructions that, when executed by the processor, cause the processor to:

send a reference signal to user equipment based on reference signal resource configuration information, the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure, and

receive a precoding matrix indicator (PMI) reported by the user equipment, wherein the PMI is used to indicate a precoding matrix selected by the user equipment, the precoding matrix is selected by the user equipment from a codebook based on the reference signal, and a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure.

12. The apparatus of claim 11 , wherein receiving the PMI reported by the user equipment comprises:

separately receiving a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 that are reported by the user equipment.

13. A non-transitory computer readable medium storing instructions for reporting channel state information that, when executed by a processor, cause the processor to:

acquire reference signal resource configuration information, wherein the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure;

receive, according to the reference signal resource configuration information, a reference signal sent by a base station;

select a precoding matrix from a codebook based on the received reference signal, wherein a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure; and

report a precoding matrix indicator (PMI) to the base station, wherein the PMI is used to indicate the selected precoding matrix.

14. The non-transitory computer readable medium of claim 13 , wherein reporting the PMI to the base station comprises:

separately reporting a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 to the base station.

15. A non-transitory computer readable medium storing instructions for receiving channel state information that, when executed by a processor, cause the processor to:

send a reference signal to user equipment based on reference signal resource configuration information, the reference signal resource configuration information comprises antenna port configuration information, the antenna port configuration information is used to indicate an antenna port structure; and

receive a precoding matrix indicator (PMI) reported by the user equipment, wherein the PMI is used to indicate a precoding matrix selected by the user equipment, the precoding matrix is selected by the user equipment from a codebook based on the reference signal, and a structure of the precoding matrix corresponds to the antenna port structure indicated by the antenna port configuration information, wherein the structure of the precoding matrix is W=W 1 W 2 , wherein

W

1

=

[

X

0

0

X

]

,

and X=A⊗B; ⊗ indicates a Kronecker product; A and B are matrices of (n/2)×p and m×q respectively, or A and B are matrices of n×p and (m/2)×q respectively; W 2 is a matrix of r columns, wherein p and q are positive integers, and r is a rank of the precoding matrix, m corresponds to a quantity of rows in the antenna port structure, and n corresponds to a quantity of columns in the antenna port structure.

16. The non-transitory computer readable medium of claim 15 , wherein receiving the PMI reported by the user equipment comprises:

separately receiving a first PMI used to indicate the matrix W 1 and a second PMI used to indicate the matrix W 2 that are reported by the user equipment.