METHOD, SYSTEM, AND DEVICE FOR TRANSMITTING CODING INSTRUCTION INFORMATION AND FOR DETERMINING PRE-CODING MATRIX

• US 20150263800A1
• Filed: 08/30/2013
• Published: 09/17/2015
• Est. Priority Date: 10/19/2012
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Gao, Qiubin
• Granted Patent: US 9,484,995 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 25/0391 construction details of matrices

Abstract

The present application relates to the technical field of radio communications, and relates specifically to a method, system, and device for transmitting coding instruction information and for determining a pre-coding matrix, for use in solving the problem that direct application of current codebooks to a three-dimensional beamforming/pre-coding technology causes performance degradation. The method of embodiments of the present application comprises: a user equipment determines and transmits first pre-coding instruction information, second pre-coding instruction information, and third pre-coding instruction information, where the first pre-coding instruction information, the second pre-coding instruction information, and the third pre-coding instruction information correspond to a pre-coding matrix, a first component pre-coding matrix is a block diagonal matrix, a third component pre-coding matrix is constituted by a weighted column selection vector, and, with the exception of a P-number of nonzero elements, the remainder of the weighted column selection vector is all zeros. Employment of the solution of the embodiments of the present application increases the performance of the three-dimensional beamforming/pre-coding technology.

Claims

1. A method for transmitting a coding indicator, the method comprising:

determining, by a user equipment, a first pre-coding indicator, a second pre-coding indicator and a third pre-coding indicator, wherein the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator correspond to a pre-coding matrix which is equal to a matrix as a function of a first component pre-coding matrix, a second component pre-coding matrix and a third component pre-coding matrix, the first component pre-coding matrix is a block diagonal matrix, and the third component pre-coding matrix is composed of weighted column selection vectors, and in each of the weighted column selection vectors only P elements are non-zero with P being a positive integer; and

transmitting, by the user equipment, the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator to the network side.

2. The method according to claim 1, wherein determining, by the user equipment, the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator comprises:

selecting, by the user equipment, the first component pre-coding matrix from a set of first component pre-coding matrices and determining the first pre-coding indicator corresponding to the selected first component pre-coding matrix, selecting the second component pre-coding matrix from a set of second component pre-coding matrices and determining the second pre-coding indicator corresponding to the selected second component pre-coding matrix, and selecting the third component pre-coding matrix from a set of third component pre-coding matrices and determining the third pre-coding indicator corresponding to the selected third component pre-coding matrix;

or

determining, by the user equipment, at least one pre-coding matrix; and

determining first pre-coding indicators, second pre-coding indicators and third pre-coding indicators corresponding to the at least one pre-coding matrix according to a correspondence relationship between the first pre-coding indicators, the second pre-coding indicators and the third pre-coding indicators, and the pre-coding matrix; and

determining, by the user equipment, one of the determined first pre-coding indicators, one of the determined second pre-coding indicators and one of the determined third pre-coding indicators as the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator to be signaled to the network side.

5. The method according to claim 1, wherein the first component pre-coding matrix is:

8. The method according to claim 1, wherein the second component pre-coding matrix is X or XA;

wherein X represents a horizontal D_H×

M_H-dimension beam-forming matrix; and

A represents a M_H×

M_H-dimension diagonal matrix, wherein M_H and D_H represent positive integers.

11. The method according to claim 1, wherein the third component pre-coding matrix is a product of a (2M_H M_V)×

r-dimension matrix with a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and

the third component pre-coding matrix is;

12. The method according to claim 1, wherein the pre-coding matrix is:

W=(W₁W₂)·

W₃,

wherein W represents the pre-coding matrix, W1 represents the first component pre-coding matrix, W2 represents the second component pre-coding matrix, and W3 represents the third component pre-coding matrix.

3. (canceled)

4. (canceled)

6. (canceled)

7. (canceled)

9. (canceled)

10. (canceled)

13. A method for determining a pre-coding matrix, the method comprising:

receiving, by a network side device, a first pre-coding indicator, a second pre-coding indicator and a third pre-coding indicator from a user equipment; and

determining, by the network side device, a pre-coding matrix from the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator,

wherein the pre-coding matrix is equal to a matrix as a function of a first component pre-coding matrix, a second component pre-coding matrix and a third component pre-coding matrix, the first component pre-coding matrix is a block diagonal matrix, and the third component pre-coding matrix is composed of weighted column selection vectors, and in each of the weighted column selection vectors only P elements are non-zero with P being a positive integer.

14. The method according to claim 13, 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, determining the second component pre-coding matrix corresponding to the second pre-coding indicator, and determining the third component pre-coding matrix corresponding to the third pre-coding indicator;

or

determining, by the network side device, the pre-coding matrix corresponding to the received first pre-coding indicator, second pre-coding indicator and third pre-coding indicator according to a preset correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator, and the pre-coding matrix;

and

the network side device determines the pre-coding matrix in the equation of;

W=(W₁W₂)·

W₃,

wherein W represents the pre-coding matrix, W1 represents the first component pre-coding matrix, W2 represents the second component pre-coding matrix, and W3 represents the third component pre-coding matrix.

16. The method according to claim 13, wherein the first component pre-coding matrix is:

17. The method according to claim 13, wherein the second component pre-coding matrix is X or XA;

wherein X represents a horizontal D_H×

M_H-dimension beam-forming matrix; and

A represents a M_H×

M_H-dimension diagonal matrix, wherein M_H and D_H represent positive integers; and

X represents an element in a set of horizontal beam-forming matrices {X_p;

p=0, 1, . . . , N_H−

1} with X=X_k and 0≦

k≦

N_H−

1, wherein N_H represents a positive integer.

18. The method according to claim 13, wherein the third component pre-coding matrix is a product of a (2M_H M_V)×

r-dimension matrix with a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and

the third component pre-coding matrix is;

15. (canceled)

19. (canceled)

20. A user equipment, for transmitting a coding indicator, the user equipment comprising:

a first determining module used to determine a first pre-coding indicator, a second pre-coding indicator and a third pre-coding indicator, wherein the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator correspond to a pre-coding matrix which is equal to a matrix as a function of a first component pre-coding matrix, a second component pre-coding matrix and a third component pre-coding matrix, the first component pre-coding matrix is a block diagonal matrix, and the third component pre-coding matrix is composed of weighted column selection vectors, and in each of the weighted column selection vectors only P elements are non-zero with P being a positive integer; and

a transmitting module used to transmit the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator to the network side.

21. The user equipment according to claim 20, wherein the first determining module is used:

to select the first component pre-coding matrix from a set of first component pre-coding matrices and to determine the first pre-coding indicator corresponding to the selected first component pre-coding matrix, to select the second component pre-coding matrix from a set of second component pre-coding matrices and to determine the second pre-coding indicator corresponding to the selected second component pre-coding matrix, and to select the third component pre-coding matrix from a set of third component pre-coding matrices and to determine the third pre-coding indicator corresponding to the selected third component pre-coding matrix;

or

to determine at least one pre-coding matrix;

to determine first pre-coding indicators, second pre-coding indicators and third pre-coding indicators corresponding to the at least one pre-coding matrix according to a correspondence relationship between the first pre-coding indicators, the second pre-coding indicators and the third pre-coding indicators, and the pre-coding matrix; and

to determine one of the determined first pre-coding indicators, one of the determined second pre-coding indicators and one of the determined third pre-coding indicators as the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator to be signaled to the network side.

24. The user equipment according to claim 20, wherein the first component pre-coding matrix is:

27. The user equipment according to claim 20, wherein the second component pre-coding matrix is X or XA;

wherein X represents a horizontal D_H×

M_H-dimension beam-forming matrix; and

A represents a M_H×

M_H-dimension diagonal matrix, wherein M_H and D_H represent positive integers.

30. The user equipment according to claim 20, wherein the third component pre-coding matrix is a product of a (2M_HM_V)×

r-dimension matrix with a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and

the third component pre-coding matrix is;

31. The user equipment according to claim 20, wherein the pre-coding matrix is:

W=(W₁W₂)·

W₃,

wherein W represents the pre-coding matrix, W1 represents the first component pre-coding matrix, W2 represents the second component pre-coding matrix, and W3 represents the third component pre-coding matrix.

22. (canceled)

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29. (canceled)

32. A network side device for determining a pre-coding matrix, the network side device comprising:

a receiving module used to receive a first pre-coding indicator, a second pre-coding indicator and a third pre-coding indicator from a user equipment; and

a second determining module used to determine a pre-coding matrix from the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator,

wherein the pre-coding matrix is equal to a matrix as a function of a first component pre-coding matrix, a second component pre-coding matrix and a third component pre-coding matrix, the first component pre-coding matrix is a block diagonal matrix, and the third component pre-coding matrix is composed of weighted column selection vectors, and in each of the weighted column selection vectors only P elements are non-zero with P being a positive integer.

33. The network side device according to claim 32, wherein the second determining module is used:

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 the third component pre-coding matrix corresponding to the third pre-coding indicator;

or

to determine the pre-coding matrix corresponding to the received first pre-coding indicator, second pre-coding indicator and third pre-coding indicator according to a preset correspondence relationship between the first pre-coding indicator, the second pre-coding indicator and the third pre-coding indicator, and the pre-coding matrix;

and

to determine the pre-coding matrix in the equation of;

W=(W₁W₂)·

W₃,

wherein W represents the pre-coding matrix, W1 represents the first component pre-coding matrix, W2 represents the second component pre-coding matrix, and W3 represents the third component pre-coding matrix.

35. The network side device according to claim 32, wherein the first component pre-coding matrix is:

36. The network side device according to claim 32, wherein the second component pre-coding matrix is X or XA;

wherein X represents a horizontal D_H×

M_H-dimension beam-forming matrix; and

A represents a M_H×

M_H-dimension diagonal matrix, wherein M_H and D_H represent positive integers; and

X represents an element in a set of horizontal beam-forming matrices {X_p;

p=0, 1, . . . , N_H−

1} with X=X_k and 0≦

k≦

N_H−

1, wherein N_H represents a positive integer.

37. The network side device according to claim 32, wherein the third component pre-coding matrix is a product of a (2M_HM_V)×

r-dimension matrix with a power normalization coefficient, wherein r represents the number of columns in the pre-coding matrix; and

the third component pre-coding matrix is;

34. (canceled)

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