Method, system and device for transmitting pre-coded indication information and determining pre-coding matrix
View Patent ↗An embodiment of the present application relates to the technical field of wireless communications, in particular to a method, system and device for transmitting pre-coded indication information and determining a pre-coding matrix. In the prior art, the existing codebook is designed for horizontal beamforming/pre-coding, and will reduce the performance thereof if directly applied in three-dimensional beamforming/pre-coding technique. The present application solves the problem. The method in the embodiment of the present application comprises: a user equipment (UE) determines and transmits first pre-coded indication information and second pre-coding indication information, the pre-coding matrix being equal to the function matrix of a first component pre-coding matrix and a second component pre-coding matrix, a sub-matrix on the diagonal of the first component pre-coding matrix being the Kronecker product of two diagonal matrixes, the second component pre-coding matrix being formed by a beam rotation vector equaling to the Kronecker product of two vectors. The embodiment of the present application improves the performance of the three-dimensional beamforming/pre-coding technique.
1. A method for transmitting a pre-coding indicator, the method comprising:
determining, by a UE, a first pre-coding indicator and a second pre-coding indicator, the first pre-coding indicator and the second pre-coding indicator corresponding to 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, the first component pre-coding matrix being a block diagonal matrix with sub-matrixes on the diagonal being a Kronecker product of two diagonal matrixes, and the second component pre-coding matrix being constructed by beam-rotating vectors, each of the beam-rotating vectors being equal to a Kronecker product of two vectors; and
transmitting, by the UE, the first pre-coding indicator and the second pre-coding indicator to a network side.
2. The method according to claim 1 , wherein the first component pre-coding matrix is:
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
AU
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
AU
H
)
]
,
W 1 represents the first component pre-coding matrix; U H represents a beam-forming vector with D H ×1 dimension; U V represents a beam-forming vector with D V ×1dimension; A represents a diagonal matrix with D H ×D H dimension; B represents a diagonal matrix with D V ×D V dimension, D H and D V represent positive integers; and diag(U) represents a diagonal matrix, derived from a vector U, with elements on the diagonal being equal to elements in the vector U.
3. The method according to claim 2 , wherein U H represents an element in a set of beam-forming vectors {U H,p : p=0,1, . . . , N H− 1} with U H =U H,k and 0≦k≦N H −1, N H represents a positive integer; and U V represents an element in a set of beam-forming vectors {U V,q :q=0,1, . . . , N V −1} with U V =U V,n and 0≦n≦N V −1, N V represents a positive integer.
4. 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,
i 1 represents the first pre-coding indicator.
5. The method according to claim 1 , wherein the second component pre-coding matrix is a product of a (2D H D V )×r -dimension matrix and a power normalization coefficient, r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
X
V
1
⊗
X
H
1
⋯
X
V
r
⊗
X
H
r
α
1
X
V
1
⊗
X
H
1
⋯
α
r
X
V
r
⊗
X
H
r
]
M
,
W 2 represents the second component pre-coding matrix; α i represents a complex scalar with a modulus being 1; X V i represents a beam-forming vector with D V ×1 dimension; and X H i represents a beam-forming vector with D H ×1 dimension, i=1, . . . , r, D H and D V represent positive integers, and M represents the power normalization coefficient.
6. The method according to claim 1 , wherein the 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,
wherein the 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 first pre-coding indicator and 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.
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. A method for determining a pre-coding matrix, the method comprising:
receiving, by a network-side device, a first pre-coding indicator and a second pre-coding indicator from a UE; and
determining, by the network-side device, a pre-coding matrix corresponding to the first pre-coding indicator and the second pre-coding indicator,
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 diagonal matrixes, and the second component pre-coding matrix is constructed by beam-rotating vectors, each of the beam-rotating vectors is equal to a Kronecker product of two vectors.
9. The method according to claim 8 , wherein the 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,
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.
10. The method according to claim 9 , 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
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
AU
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
AU
H
)
]
,
W 1 represents the first component pre-coding matrix; U H represents a beam-forming vector with D H ×1 dimension; U V represents a beam-forming vector with D V ×1 dimension; A represents a diagonal matrix with D H ×D H dimension; B represents a diagonal matrix with D V ×D V dimension, D H and D V represent positive integers; and diag(U) represents a diagonal matrix, derived from a vector U, with elements on the diagonal being equal to elements in the vectors U.
11. The method according to claim 9 , wherein the second component pre-coding matrix is a product of a (2D H D V )×r -dimension matrix and a power normalization coefficient, r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
X
V
1
⊗
X
H
1
⋯
X
V
r
⊗
X
H
r
α
1
X
V
1
⊗
X
H
1
⋯
α
r
X
V
r
⊗
X
H
r
]
M
,
W 2 represents the second component pre-coding matrix; α i represents a complex scalar with a modulus being 1; X V i represents a beam-forming vector with D V ×1 dimension; and X H i represents a beam-forming vector with D H ×1 dimension, i=1, . . . , r, D H and D V represent positive integers, and M represents the power normalization coefficient.
12. A UE for transmitting a pre-coding indicator, the UE comprising:
a first determining device configured to determine a first pre-coding indicator and a second pre-coding indicator, the first pre-coding indicator and the second pre-coding indicator corresponding to 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, the first component pre-coding matrix being a block diagonal matrix with sub-matrixes on the diagonal being a Kronecker product of two diagonal matrixes, and the second component pre-coding matrix being constructed by beam-rotating vectors, each of the beam-rotating vectors being equal to a Kronecker product of two vectors; and
a transmitting device configured to transmit the first pre-coding indicator and the second pre-coding indicator to a network side.
13. The UE according to claim 12 , wherein the first component pre-coding matrix is:
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
AU
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
AU
H
)
]
,
W 1 represents the first component pre-coding matrix; U H represents a beam-forming vector with D H ×1 dimension; U V represents a beam-forming vector with D v ×1 dimension; A represents a diagonal matrix with D H ×D H dimension; B represents a diagonal matrix with D V ×D V dimension, D H and D V represent positive integers; and diag(U) represents a diagonal matrix, derived from a vector U, with elements on the diagonal being equal to elements in the vector U.
14. The UE according to claim 12 , wherein the second component pre-coding matrix is a product of a (2D H D V )×r -dimension matrix and a power normalization coefficient, r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
X
V
1
⊗
X
H
1
⋯
X
V
r
⊗
X
H
r
α
1
X
V
1
⊗
X
H
1
⋯
α
r
X
V
r
⊗
X
H
r
]
M
,
W 2 represents the second component pre-coding matrix; α i represents a complex scalar with a modulus being 1; X V i represents a beam-forming vector with D V ×1 dimension; and X H i represents a beam-forming vector with D H ×1 dimension, i=1, . . . , r, D H and D v represent positive integers, and M represents the power normalization coefficient.
15. The UE according to claim 12 , wherein the first determining device 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 first determining device 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 12 , wherein the first determining device is 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.
17. A network-side device for determining a pre-coding matrix, the network-side device comprising:
a receiving device configured to receive a first pre-coding indicator and a second pre-coding indicator from a UE; and
a second determining device configured to determine a pre-coding matrix corresponding to the first pre-coding indicator and the second pre-coding indicator,
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 diagonal matrixes, and the second component pre-coding matrix is constructed by beam-rotating vectors, each of the beam-rotating vectors is equal to a Kronecker product of two vectors.
18. The network-side device according to claim 17 , wherein the second determining device is configured:
to determine the first component pre-coding matrix corresponding to the first pre-coding indicator, 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 second determining device 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.
19. The network-side device according to claim 18 , wherein the second determining device is configured to determine the first component pre-coding matrix corresponding to the first pre-coding indicator in the equation of:
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
U
V
)
⊗
diag
(
AU
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
U
H
)
]
;
or
W
1
=
[
diag
(
U
V
)
⊗
diag
(
U
H
)
0
0
diag
(
BU
V
)
⊗
diag
(
AU
H
)
]
,
W 1 represents the first component pre-coding matrix; U H represents a beam-forming vector with D H ×1 dimension; U V represents a beam-forming vector with D V ×1 dimension; A represents a diagonal matrix with D H ×D H dimension; B represents a diagonal matrix with D V ×D V dimension, D H and D V represent positive integers; and diag(U) represents a diagonal matrix, derived from a vector U, with elements on the diagonal being equal to elements in the vector U.
20. The network-side device according to claim 18 , wherein the second component pre-coding matrix is a product of a (2D H D V )×r -dimension matrix and a power normalization coefficient, r represents the number of columns in the pre-coding matrix; and
the second component pre-coding matrix is:
W
2
=
[
X
V
1
⊗
X
H
1
⋯
X
V
r
⊗
X
H
r
α
1
X
V
1
⊗
X
H
1
⋯
α
r
X
V
r
⊗
X
H
r
]
M
,
W 2 represents the second component pre-coding matrix; α i represents a complex scalar with a modulus being 1; X V i represents a beam-forming vector with D V ×1 dimension; and X H i represents a beam-forming vector with D H ×1 dimension, i=1, . . . , r, D H and D V represent positive integers, and M represents the power normalization coefficient.