Method, system, and device for transmitting coding instruction information and for determining pre-coding matrix
View Patent ↗A method, system, and device for transmitting coding instruction information, for use in solving the problem as current codebooks are designed for horizontal beamforming/pre-coding, direct application of the codebooks to a three-dimensional beamforming/pre-coding technology causes performance degradation. The method of embodiments of the present invention comprises: a user equipment determines and transmits to a network side first pre-coding instruction information and second pre-coding instruction information, where a first component pre-coding matrix is a block diagonal matrix, a submatrix on the diagonal is equal to the Kronecker product of two matrices, a second component pre-coding matrix is constituted by a weighted column selection vector, with the exception of a P-number of nonzero elements, the remainder of the weighted column selection vector is all zeros, and P is a positive integer. Employment of the method of the embodiments of the present invention increases the performance of the three-dimensional beamforming/pre-coding technology.
1. A method for processing data, the method comprising:
determining, by a UE, a channel of each antenna port to the UE according to a pilot symbol transmitted by a network side;
determining, by the UE, a pre-coding matrix which is equal to a matrix as a function of a first component pre-coding matrix and a second component pre-coding matrix according to the determined channel, the first component pre-coding matrix is a block diagonal matrix with sub-matrixes on the diagonal being a Kronecker product of two matrixes, and the second component pre-coding matrix is composed of weighted column selection vectors, elements of the weighted column selection vector are zeros other than P non-zero elements with P being a positive integer;
determining, by the UE, a first pre-coding indicator and a second pre-coding indicator which are corresponding to the pre-coding matrix according to the first component pre-coding matrix and the second component pre-coding matrix;
transmitting, by the UE, the first pre-coding indicator and the second pre-coding indicator to the network side;
receiving, by a network-side device, the first pre-coding indicator and the second pre-coding indicator from the UE;
determining, by the network-side device, the pre-coding matrix from the first pre-coding indicator and the second pre-coding indicator, and preprocessing data to be transmitted to the UE using the pre-coding matrix;
transmitting, by the network-side device, the data preprocessed using the pre-coding matrix to the UE; and
receiving, by the UE, the data preprocessed using the pre-coding matrix from the network-side device.
2. The method according to claim 1 , wherein the first component pre-coding matrix is:
W
1
=
[
Z
⊗
X
0
0
Z
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
Z
⊗
XA
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
XA
]
,
wherein W 1 represents the first component pre-coding matrix; X represents a beam-forming matrix with D H ×M H dimension; Z represents a beam-forming matrix with D V ×M V dimension; A represents a diagonal matrix with M H ×M H dimension; and B represents a diagonal matrix with M V ×M V dimension, wherein M H , D H , D V and M V represent positive integers.
3. The method according to claim 2 , wherein X represents an element in a set of beam-forming matrixes {X p :p==0, 1, . . . , N H −1} with X=X k and 0≤k≤N H −1; and Z represents an element in a set of beam-forming matrixes {Z q :q=0, 1 . . . , N V −1} with Z=Z n and 0≤n≤N V −1, wherein N H and N V are positive integers.
4. The method according to claim 1 , wherein the second component pre-coding matrix is a product of a (2M H M V )×r-dimension matrix and a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
e
k
1
e
k
2
…
e
k
r
α
1
e
k
1
α
2
e
k
2
…
α
r
e
k
r
]
M
,
wherein W 2 represents the second component pre-coding matrix; e k i represents a column vector with a length of M H M V and with the k i -th element being 1 and all the other elements being 0; and α i represents a complex scalar with a modulus being 1, wherein M H and M V represent positive integers, and M represent the power normalization coefficient.
5. The method according to claim 1 , wherein determining, by the UE, the first pre-coding indicator and the second pre-coding indicator comprises:
selecting, by the UE, the first component pre-coding matrix from a set of first component pre-coding matrixes and determining the first pre-coding indicator corresponding to the selected first component pre-coding matrix, and selecting the second component pre-coding matrix from a set of second component pre-coding matrixes and determining the second pre-coding indicator corresponding to the selected second component pre-coding matrix;
or,
determining, by the UE, the first pre-coding indicator and the second pre-coding indicator comprises:
determining, by the UE, at least one pre-coding matrix, and determining the first pre-coding indicator and the second pre-coding indicator corresponding to the at least one pre-coding matrix according to a correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the pre-coding matrix; and
determining, by the UE, that one of the determined first pre-coding indicator and one of the determined second pre-coding indicator are the first pre-coding indicator and the second pre-coding indicator to be transmitted to the network side.
6. The method according to claim 3 , wherein the UE determines the first pre-coding indicator in the equation of:
i 1 =n×N H +k or i 1 =k×N V +n,
wherein i 1 represents the first pre-coding indicator, N H represents the number of elements in the set of beam-forming matrixes {X p :p==0, 1, . . . , N H −1}, k represents the serial number of elements in the set beam-forming matrixes {X p :p==0, 1, . . . , N H −1}, and n represents the serial number of elements in the set of beam-forming matrixes {Z q :q=0, 1, . . . , N V −1}.
7. The method according to claim 1 , wherein the UE determines that a product of the first component pre-coding matrix and the second component pre-coding matrix is the pre-coding matrix.
8. The method according to claim 1 , wherein determining, by the network-side device, the pre-coding matrix comprises:
determining, by the network-side device, the first component pre-coding matrix corresponding to the first pre-coding indicator and determining the second component pre-coding matrix corresponding to the second pre-coding indicator; and
determining, by the network-side device, that a product of the first component pre-coding matrix and the second component pre-coding matrix is the pre-coding matrix;
or,
wherein determining, by the network-side device, the pre-coding matrix comprises:
determining, by the network-side device, the pre-coding matrix corresponding to the received first pre-coding indicator and second pre-coding indicator according to a preset correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the pre-coding matrix.
9. The method according to claim 8 , wherein the network-side device determines the first component pre-coding matrix corresponding to the first pre-coding indicator in the equation of:
W
1
=
[
Z
⊗
X
0
0
Z
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
Z
⊗
XA
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
XA
]
,
wherein W 1 represents the first component pre-coding matrix; X represents a beam-forming matrix with D H ×M H dimension; Z represents a beam-forming matrix with D V ×M V dimension; A represents a diagonal matrix with M H ×M N dimension; and B represents a diagonal matrix with M V ×M V dimension, wherein M H , D H , D V and M V represent positive integers.
10. The method according to claim 8 , wherein the second component pre-coding matrix is a product of a (2M H M V )×r-dimension matrix and a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and
the network-side device determines the second component pre-coding matrix corresponding to the second pre-coding indicator in the equation of:
W
2
=
[
e
k
1
e
k
2
…
e
k
r
α
1
e
k
1
α
2
e
k
2
…
α
r
e
k
r
]
M
,
wherein W 2 represents the second component pre-coding matrix; e k i represents a column vector with a length of M H M V and the k i -th element being 1 and all the other elements being 0; α i represents a complex scalar with a modulus being 1; M H and M V represent positive integers; and M represent the power normalization coefficient.
11. A UE, comprising:
a processor configured to determine a channel of each antenna port to the UE according to a pilot symbol transmitted by a network side; determine a pre-coding matrix which is equal to a matrix as a function of a first component pre-coding matrix and a second component pre-coding matrix according to the determined channel, the first component pre-coding matrix is a block diagonal matrix with sub-matrixes on the diagonal being a Kronecker product of two matrixes, and the second component pre-coding matrix is composed of weighted column selection vectors, elements of the weighted column selection vector are zeros other than P non-zero elements with P being a positive integer; determine a first pre-coding indicator and a second pre-coding indicator which are corresponding to the pre-coding matrix according to the first component pre-coding matrix and the second component pre-coding matrix; and
a transceiver configured to transmit the first pre-coding indicator and the second pre-coding indicator to the network side, and receive data preprocessed using the pre-coding matrix from the network-side.
12. The UE according to claim 11 , wherein the first component pre-coding matrix is:
W
1
=
[
Z
⊗
X
0
0
Z
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
Z
⊗
XA
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
XA
]
,
wherein W 1 represents the first component pre-coding matrix; X represents a beam-forming matrix with D H ×M H dimension; Z represents a beam-forming matrix with D V ×M V dimension; A represents a diagonal matrix with M H ×M H dimension; and B represents a diagonal matrix with M V ×M V dimension, wherein M H , D H , D V and M V represent positive integers.
13. The UE according to claim 12 , wherein X represents an element in a set of beam-forming matrixes {X p :p==0, 1, . . . , N H −1} with X=X k and 0≤k≤N H −1; and Z represents an element in a set of beam-forming matrixes {Z q :q=0, 1, . . . , N V −1} with Z=Z n and 0≤n≤N V −1, wherein N H and N V are positive integers.
14. The UE according to claim 11 , wherein the second component pre-coding matrix is a product of a (2M H M V )×r-dimension matrix and a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
e
k
1
e
k
2
…
e
k
r
α
1
e
k
1
α
2
e
k
2
…
α
r
e
k
r
]
M
,
wherein W 2 represents the second component pre-coding matrix; e k i represents a column vector with a length of M H M V and the k i -th element being 1 and all the other elements being 0; and α i represents a complex scalar with a modulus being 1, wherein M H and M V represent positive integers, and M represent the power normalization coefficient.
15. The UE according to claim 11 , wherein the processor is configured:
to select the first component pre-coding matrix from a set of first component pre-coding matrixes and to determine the first pre-coding indicator corresponding to the selected first component pre-coding matrix, and to select the second component pre-coding matrix from a set of second component pre-coding matrixes and to determine the second pre-coding indicator corresponding to the selected second component pre-coding matrix;
or,
wherein the processor is configured:
to determine at least one pre-coding matrix; to determine the first pre-coding indicator and the second pre-coding indicator corresponding to the at least one pre-coding matrix according to a correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the pre-coding matrix; and to determine that one of the determined first pre-coding indicator and one of the determined second pre-coding indicator are the first pre-coding indicator and the second pre-coding indicator to be transmitted to the network side.
16. The UE according to claim 13 , the processor is configured to determine the first pre-coding indicator in the equation of:
i 1 =n×N H +k or i 1 =k×N V +n,
wherein i 1 represents the first pre-coding indicator, N 1 represents the number of elements in the set of beam-forming matrixes {X p :p==0, 1, . . . , N H −1}, k represents the serial number of elements in the set beam-forming matrixes {X p :p==0, 1, . . . , N H −1}, and n represents the serial number of elements in the set of beam-forming matrixes {Z q :q=0, 1, . . . , N V −1}.
17. The UE according to claim 11 , wherein the processor is further configured:
to determine that a product of the first component pre-coding matrix and the second component pre-coding matrix is the pre-coding matrix.
18. A network-side device, comprising a transceiver and a processor; wherein:
the transceiver is configured to receive a first pre-coding indicator and a second pre-coding indicator from a UE;
the processor configured to determine a pre-coding matrix from the first pre-coding indicator and the second pre-coding indicator, and preprocess data to be transmitted to the UE using the pre-coding matrix; and
the transceiver is further configured to transmit the data preprocessed using the pre-coding matrix to the UE;
wherein the pre-coding matrix is equal to a matrix as a function of a first component pre-coding matrix and a second component pre-coding matrix, the first component pre-coding matrix is a block diagonal matrix with sub-matrixes on the diagonal being a Kronecker product of two matrixes, and the second component pre-coding matrix is composed of weighted column selection vectors, elements of the weighted column selection vector are zeros other than P non-zero elements with P being a positive integer.
19. The network-side device according to claim 18 , wherein the processor is configured:
to determine the first component pre-coding matrix corresponding to the first pre-coding indicator and to determine the second component pre-coding matrix corresponding to the second pre-coding indicator; and to determine that a product of the first component pre-coding matrix and the second component pre-coding matrix is the pre-coding matrix;
or,
wherein the processor is configured:
to determine the pre-coding matrix corresponding to the received first pre-coding indicator and second pre-coding indicator according to a preset correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the pre-coding matrix.
20. The network-side device according to claim 19 , wherein the processor is configured to determine the first component pre-coding matrix corresponding to the first pre-coding indicator in the equation of:
W
1
=
[
Z
⊗
X
0
0
Z
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
Z
⊗
XA
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
X
]
,
or
W
1
=
[
Z
⊗
X
0
0
ZB
⊗
XA
]
,
wherein W 1 represents the first component pre-coding matrix; X represents a beam-forming matrix with D H ×M H dimension; Z represents a beam-forming matrix with D V ×M V dimension; A represents a diagonal matrix with M H ×M H dimension; and B represents a diagonal matrix with M V ×M V dimension, wherein M H , D H , D V and M V represent positive integers.