CN111315016B - Codebook feedback method, user terminal and computer readable storage medium - Google Patents
Codebook feedback method, user terminal and computer readable storage medium Download PDFInfo
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- CN111315016B CN111315016B CN201910026702.XA CN201910026702A CN111315016B CN 111315016 B CN111315016 B CN 111315016B CN 201910026702 A CN201910026702 A CN 201910026702A CN 111315016 B CN111315016 B CN 111315016B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
A codebook feedback method, a user terminal and a computer readable storage medium are provided. The method comprises the following steps: determining spatial domain beam index information, frequency domain beam index information and complex weighting coefficient information; feeding back the determined information; the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain wave beams under different space domain wave beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam. By adopting the scheme, the UE can feed back the enhanced Type II codebook to the base station.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a codebook feedback method, a user terminal, and a computer-readable storage medium.
Background
In the Rel-15 standardized conference, a New Radio (NR) system of fifth generation mobile communication (5G) defines a plurality of codebooks, one of which is called a second Type (Type II) codebook. The Type II codebook is formed by linearly superimposing spatial beam vectors of different spatial beams of a User Equipment (UE) under each subband.
In the standardized conference of Rel-16, the Type II codebook defined in Rel-15 is enhanced in order to reduce the feedback overhead. And (3) relative to the Type II codebook defined in Rel-15, the enhanced Type II codebook compresses the dimension of the sub-band of the codebook matrix by frequency domain beams besides compressing the dimension of the antenna port of the codebook matrix by spatial domain beams.
However, for the enhanced Type II codebook, how the UE feeds back to the base station does not have a solution yet.
Disclosure of Invention
The invention aims to solve the problem of how UE feeds back an enhanced Type II codebook to a base station in a 5G NR system.
In order to solve the above problem, an embodiment of the present invention provides a codebook feedback method, where the method includes: determining spatial domain beam index information, frequency domain beam index information and complex weighting coefficient information; feeding back the determined information; the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different airspace beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam.
Optionally, the complex weighting factor information includes: first indication information and first complex weighting coefficient information, wherein: the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; and the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial domain beam under each frequency domain beam.
Optionally, the complex weighting factor information includes: first indication information, second complex weighting coefficient information, and first position information, wherein: the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; the second complex weighting coefficient information is a weighting coefficient value of the feedback spatial domain wave beam under the frequency domain wave beam with non-zero amplitude; the first position information is position information corresponding to the fed back weighting coefficient.
Optionally, the first indication information includes: and the average energy of the broadband is smaller than the index value of the spatial domain wave beam of the first preset threshold value.
Optionally, the complex weighting factor information includes: a third complex weighting coefficient, second location information, and third location information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the second position information is initial position information of a weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix; the third position information is the initial position information of the weighting coefficient value smaller than or equal to the second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix.
Optionally, the complex weighting factor information includes: a third complex weighting coefficient, second location information, and first duration information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the second position information is the initial position information of the weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix; the first persistence length information is persistence length information of the weighting coefficient value greater than a second preset threshold.
Optionally, the complex weighting factor information includes: a third complex weighting coefficient, third position information, and second duration information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain wave beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the third position information is initial position information of a weighting coefficient value which is less than or equal to a second preset threshold value in a one-dimensional vector corresponding to the weighting coefficient matrix; the second persistence length information is persistence length information of the weighting coefficient value less than or equal to the second preset threshold.
Optionally, the complex weighting factor information includes: phase parameter information of different frequency domain wave beams under different space domain wave beams, and amplitude parameter information of different frequency domain wave beams under different space domain wave beams.
Optionally, the spatial beam index information includes: the method comprises the steps of determining an index value of a spatial beam of the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam.
An embodiment of the present invention further provides a user terminal, where the user terminal includes: the determining unit is suitable for determining the spatial domain beam index information, the frequency domain beam index information and the complex weighting coefficient information; a feedback unit adapted to feedback the determined information; the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different airspace beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam.
Optionally, the complex weighting coefficient information determined by the determining unit includes: first indication information and first complex weighting coefficient information, wherein: the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; and the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial domain beam under each frequency domain beam.
Optionally, the complex weighting coefficient information determined by the determining unit includes: first indication information, second complex weighting coefficient information, and first position information, wherein: the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; the second complex weighting coefficient information is a weighting coefficient value of the feedback airspace wave beam under the domain wave beam with non-zero amplitude; the first position information is position information corresponding to the fed back weighting coefficient.
Optionally, the first indication information includes: and the average energy of the broadband is smaller than the index value of the spatial domain wave beam of the first preset threshold value.
Optionally, the complex weighting coefficient information determined by the determining unit includes: a third complex weighting coefficient, second location information, and third location information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the second position information is initial position information of a weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix; the third position information is initial position information of a weighting coefficient value smaller than or equal to the second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix.
Optionally, the complex weighting factor information determined by the determining unit includes: a third complex weighting coefficient, second location information, and first duration information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain wave beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the second position information is initial position information of a weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix; the first persistence length information is persistence length information of the weighting coefficient value greater than a second preset threshold.
Optionally, the complex weighting coefficient information determined by the determining unit includes: a third complex weighting coefficient, third position information, and second duration information, wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the third position information is initial position information of a weighting coefficient value which is less than or equal to a second preset threshold value in a one-dimensional vector corresponding to the weighting coefficient matrix; the second persistence length information is persistence length information of the weighting coefficient value less than or equal to the second preset threshold.
Optionally, the complex weighting coefficient information determined by the determining unit includes: phase parameter information of different frequency domain wave beams under different spatial domain wave beams, and amplitude parameter information of different frequency domain wave beams under different spatial domain wave beams.
Optionally, the spatial beam index information determined by the determining unit includes: the index value of the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam are determined.
Embodiments of the present invention further provide a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method of any one of the above-mentioned steps is performed.
The embodiment of the present invention further provides a user terminal, which includes a memory and a processor, where the memory stores computer instructions capable of running on the processor, and the processor executes any of the steps of the method when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
by adopting the scheme, the index information of the frequency domain wave beam is determined by the index value of the frequency domain wave beam for determining the frequency domain wave beam matrix and the first oversampling deviant value corresponding to the index value of the frequency domain wave beam, and the aim of feeding back the codebook to the base station can be fulfilled by combining the index information of the space domain wave beam and the complex weighting coefficient information.
Drawings
FIG. 1 is a flow chart of a codebook feedback method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a weighting coefficient matrix according to an embodiment of the present invention;
FIG. 3 is a partial schematic diagram of a one-dimensional vector corresponding to the weighting coefficient matrix of FIG. 2;
fig. 4 is a schematic structural diagram of a user terminal in an embodiment of the present invention.
Detailed Description
In a Rel-16 standardized conference, in order to reduce feedback overhead, a Type II codebook defined in Rel-15 is enhanced, a matrix W formed by the enhanced Type II codebook is compressed by a space-domain beam in an antenna port dimension, and is compressed by a frequency-domain beam in a sub-band dimension.
Specifically, the enhanced Type II codebook matrix W = W space ×W’×W freq . Wherein, W space Is a space-domain beam matrix under broadband with the dimension of N TX ×2L，N TX For the number of transmitting antenna ports of the UE, the UE employs dual polarized antennas, and the number of spatial beams in each polarization direction is L, so that the UE has 2L spatial beams in total. W space Each column in (a) represents a length of N TX The spatial beam vector of (1).
W' is a weighting coefficient matrix of different frequency domain beams under different spatial domain beams, the dimension is 2L multiplied by K, and each value in the weighting coefficient matrix represents a weighting coefficient. Each column of W represents the weighting coefficients for a different spatial domain beam for one frequency domain beam and each row represents the weighting coefficients for a different frequency domain beam for one spatial domain beam.
W freq A frequency domain beam matrix with dimension of K × N for frequency domain beams under each space domain beam SB Each row represents a length of N SB The frequency domain beam vector of (1). N is a radical of hydrogen SB K is the number of frequency domain beams for the number of subbands for the UE.
Regarding the enhanced Type II codebook, how the UE feeds back to the base station, no solution exists yet.
Therefore, the embodiment of the present invention provides a codebook feedback method, and by applying the method, frequency domain beam index information is determined by using an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam, so that the purpose of feeding back a codebook to a base station can be achieved by combining spatial domain beam index information and complex weighting coefficient information.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, an embodiment of the present invention provides a codebook feedback method, where the method may include the following steps:
and 11, determining spatial domain beam index information, frequency domain beam index information and complex weighting coefficient information.
The spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; and the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different spatial domain beams.
How to determine the spatial-domain beam index information, the frequency-domain beam index information, and the complex weighting coefficient information is described in detail below:
in a specific implementation, for the frequency domain beam index information, the UE may feed back, to the base station, an index value of a frequency domain beam used for determining the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam. After receiving the frequency domain beam index information and the corresponding first oversampling offset value, the base station may determine a frequency domain beam matrix.
In a specific implementation, for the spatial beam index information, the UE may also feed back, to the base station, an index value of a spatial beam used for determining the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam. After receiving the spatial domain beam index information and the corresponding second oversampling offset value, the base station may determine a spatial domain beam matrix.
Fig. 2 is a schematic diagram of a weighting coefficient matrix according to an embodiment of the present invention. Each column of the weighting coefficient matrix represents the weighting coefficients of different spatial beams under one spatial beam, and each row represents the weighting coefficients of different spatial beams under one spatial beam. The weighting coefficient matrix comprises a plurality of weighting coefficient values 21, and the shade of the color in the box of each weighting coefficient value 21 represents the amplitude of the weighting coefficient at the position.
In the embodiment of the present invention, for convenience of description, when the color of the box in which the weighting coefficient value 21 is located is dark, it is recorded as a strong parameter, and when the color of the box in which the weighting coefficient value 21 is located is light, it is recorded as a weak parameter.
In a specific implementation, the number of spatial beams may be configured by the base station side. At this time, it often happens that the wideband average energy of partial spatial beams is close to zero, and the amplitude of the weighting coefficient value of the entire row in the corresponding weighting coefficient matrix is close to zero, for example, there is only a weak parameter in the entire row in the weighting coefficient matrix.
For a certain spatial beam, the energy of a partial subband is very small, for example, when a strong parameter and a weak parameter exist in a certain row in the weighting coefficient matrix.
In an embodiment of the present invention, for the enhanced Type II codebook, when the UE feeds back to the base station, the complex weighting coefficient information may include: first indication information and first complex weighting coefficient information. Wherein: the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; and the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial domain beam under each frequency domain beam.
In a specific implementation, the first indication information may include only an index value of a feedback spatial beam in the weighting coefficient matrix, may include only an index value of an unrevealed spatial beam in the weighting coefficient matrix, and may include index values of both the feedback spatial beam and the unrevealed spatial beam in the weighting coefficient matrix. As long as the base station can determine the index value of the fed-back spatial beam in the weighting coefficient matrix based on the first indication information.
In a specific implementation, the first indication information may indicate that the spatial beam is not fed back at an index value in the weighting coefficient matrix in a plurality of ways. For example, the wideband average energy of each spatial-domain beam may be sorted in advance, and the spatial-domain beam with the wideband average energy sorted smaller than the preset sequence value is used as the non-feedback spatial-domain beam.
In an embodiment of the invention, the first indication information may use an index value of a spatial beam with a wideband average energy smaller than a first preset threshold as an index value of an unreturned spatial beam in the weighting coefficient matrix, such as a spatial beam corresponding to a whole row in fig. 2 when only weak parameters exist. Accordingly, the index value of the fed-back spatial beam in the weighting coefficient matrix, that is, the spatial beam whose average broadband energy is greater than or equal to the preset threshold, is the spatial beam corresponding to the strong parameter and the weak parameter existing in the whole row in fig. 2, and the spatial beam corresponding to the dark color only.
By taking the index value of the airspace wave beam with the broadband average energy smaller than the first preset threshold value as the index value of the airspace wave beam which is not fed back in the weighting coefficient matrix, the base station can more accurately obtain the weighting coefficient matrix based on the first indication information, and the fed-back codebook can also be more accurately determined.
In the embodiment of the present invention, the first preset threshold may be set by a person skilled in the art according to actual requirements. When the broadband average energy of the airspace beam (namely the average value of the energy of each sub-band in the same row) is smaller than the first preset threshold, it is indicated that the broadband average energy of the airspace beam corresponding to the row is close to zero. When the average broadband energy of the spatial beams is greater than or equal to the first preset threshold, the average broadband energy of the spatial beams corresponding to the row is non-zero.
In a specific implementation, the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial-domain beam in each frequency-domain beam, that is, a certain row of weighting coefficient values in a weighting coefficient matrix.
In order to further reduce the feedback overhead, in an embodiment of the present invention, the complex weighting coefficient information may include: the first indication information, the second complex weighting coefficient information and the first position information. The second complex weighting coefficient information may be a weighting coefficient value of the fed-back spatial-domain beam under a frequency-domain beam with a non-zero amplitude, that is, a weighting coefficient value of the fed-back spatial-domain beam under a part of frequency-domain beams. The first position information is position information corresponding to the fed-back weighting coefficient value.
The second complex weighting coefficient information is a weighting coefficient value of the fed-back spatial beam under part of frequency domain beams, the position information of the fed-back weighting coefficient value in the weighting coefficient matrix is indicated through the first position information, so that the base station can determine the weighting coefficient value at the corresponding position based on the first position information, and the default is that the corresponding parameters of the frequency domain beams and the spatial beam are zero.
Although the first position information is added to the complex weighting coefficient information to feed back the weighting coefficient matrix, the bit number occupied by the first position information is much smaller than the bit number occupied by one weighting coefficient, so that the bit number occupied by the first position information and the second complex weighting coefficient information is reduced relative to the first complex weighting coefficient information, and the feedback overhead can be further reduced.
In order to reduce the feedback overhead, in an embodiment of the present invention, the complex weighting factor information includes: a third complex weighting coefficient, second position information, and third position information. Wherein: the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix; the second position information is initial position information of a weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix; the third position information is initial position information of a weighting coefficient value smaller than or equal to the second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix.
In a specific implementation, the one-dimensional vector corresponding to the weighting coefficient matrix may be a one-dimensional vector obtained by transforming the weighting coefficient matrix in the order of rows, or a one-dimensional vector obtained by transforming the weighting coefficient matrix in the order of columns, and how to transform is not limited specifically. The method for generating the matrix comprises the steps of generating a matrix of weighting coefficients, and transforming the matrix of weighting coefficients according to the sequence of rows, namely splicing the matrix of weighting coefficients according to the sequence of rows, namely arranging the weighting coefficient values of the rows in the original matrix of weighting coefficients according to the sequence of the rows in which the weighting coefficient values are positioned in a head-to-head connection manner. The method for transforming the weighting coefficient matrix according to the sequence of the columns is to splice the weighting coefficient matrix according to the sequence of the columns, that is, the weighting coefficient values of all the columns in the original weighting coefficient matrix are arranged in the order of the columns in the first place.
For example, a one-dimensional vector obtained by deforming the weighting coefficient matrix in fig. 2 in the order of rows is partially illustrated in fig. 3.
Taking the example of deforming the weighting coefficient matrix according to the row order to obtain a one-dimensional vector, where the third complex weighting coefficient is a weighting coefficient value under a frequency-domain beam with a non-zero amplitude in the one-dimensional vector, the second location information is start location information (e.g., locations 32, 34, and 36 in fig. 3) of a weighting coefficient value greater than a second preset threshold in the one-dimensional vector, and the third location information is start location information (e.g., locations 31, 33, and 35 in fig. 3) of a weighting coefficient value less than or equal to the second preset threshold in the one-dimensional vector corresponding to the weighting coefficient matrix. Based on the positions 31 to 36 and the weighting coefficient values under the frequency domain beams with the non-zero amplitudes, the base station can determine the positions of the weighting coefficient values under the frequency domain beams with the non-zero amplitudes in the weighting coefficient matrix, and the default parameter values of other positions are zero, so that the weighting coefficient matrix can be obtained.
In another embodiment of the present invention, in addition to the third complex weighting factor, the complex weighting factor information may include the second position information and the first duration information, instead of the third position information, that is, the complex weighting factor information includes: a third complex weighting coefficient, second position information and first duration information. Wherein: the first persistence length information is persistence length information of the weighting coefficient value greater than a second preset threshold.
For example, referring to fig. 3, the third complex weighting coefficients may include, in addition to the weighting coefficient values in the frequency-domain beam with non-zero amplitude in the one-dimensional vector, start position information of the weighting coefficient values greater than a second preset threshold, that is, positions 32, 34, and 36. Wherein the length of the duration of the weighting factor value with position 32 as the starting position is 4 weighting factor values. The duration of the weighting factor value with position 34 as the starting position is 2 weighting factor values. The duration of the weighting factor value with position 36 as the starting position is 3 weighting factor values.
In another embodiment of the present invention, in addition to the third complex weighting factor, the complex weighting factor information may not include the second position information, but includes the third position information and the second duration information, that is, the complex weighting factor information includes: a third complex weighting coefficient, third position information, and second duration information. The second persistence length information is persistence length information of the weighting coefficient value less than or equal to the second preset threshold.
For example, referring to fig. 3, the third complex weighting factor may further include, in addition to the weighting factor value in the frequency domain beam with non-zero amplitude in the one-dimensional vector, start position information of the weighting factor value smaller than or equal to the second preset threshold, that is, positions 31, 33, and 35. Wherein the length of the duration of the weighting factor value with position 31 as the starting position is 1 weighting factor value. The duration of the weighting factor value with position 33 as the starting position is 6 weighting factor values. The duration of the weighting factor value with position 35 as the starting position is 1 weighting factor value.
In a specific implementation, the second preset threshold may be set by a person skilled in the art according to actual requirements. For a certain spatial domain beam, when the energy of the corresponding sub-band is less than the second preset threshold, it indicates that the energy of the sub-band at the position is very small and close to zero, and when the energy of the corresponding sub-band is greater than or equal to the second preset threshold, it indicates that the energy of the sub-band at the position is nonzero.
It can be understood that, no matter whether the complex weighting coefficient information includes the second position information and the third position information at the same time, or includes any one of the second position information and the third position information, since the bit number occupied by the position information is much smaller than the bit number occupied by the weighting coefficient value, when at least one of the second position information and the third position information is included with respect to the first complex weighting coefficient information, the bit number occupied by the third complex weighting coefficient information is reduced, that is, the feedback overhead can be reduced.
And step 12, feeding back the determined information.
In a specific implementation, the complex weighting factor information may include: phase parameter information of different frequency domain wave beams under different spatial domain wave beams, and amplitude parameter information of different frequency domain wave beams under different spatial domain wave beams. The complex weighting coefficient information is decomposed into phase parameter information and amplitude parameter information, and then the phase parameter information and the amplitude parameter information can be fed back respectively. In other words, in the weighting coefficient matrix, the weighting coefficient values at the respective positions may be all phase values or all amplitude values. It can be understood that whether phase parameter information or amplitude parameter information is fed back, feedback can be performed by referring to the setting manner of the complex weighting coefficient information in the embodiment of the present invention.
From the above, it can be seen that the codebook feedback method in the embodiment of the present invention can achieve the purpose of feeding back the codebook to the base station by determining the frequency domain beam index information, the spatial domain beam index information, and the complex weighting coefficient information.
In order to make the present invention better understood and realized by those skilled in the art, the following detailed description is provided for a device and a computer readable storage medium corresponding to the above method.
Referring to fig. 4, an embodiment of the present invention provides a user terminal 40, where the user terminal 40 may include: a determination unit 41 and a feedback unit 42. Wherein:
the determining unit 41 is adapted to determine spatial domain beam index information, frequency domain beam index information, and complex weighting coefficient information;
the feedback unit 42 adapted to feed back the determined information;
the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different airspace beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam.
In an embodiment of the present invention, the complex weighting factor information determined by the determining unit 41 includes: first indication information and first complex weighting coefficient information, wherein:
the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix;
and the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial domain beam under each frequency domain beam.
In another embodiment of the present invention, the complex weighting factor information determined by the determining unit 41 includes: first indication information, second complex weighting coefficient information, and first position information, wherein:
the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix;
the second complex weighting coefficient information is a weighting coefficient value of the feedback airspace wave beam under the domain wave beam with non-zero amplitude;
and the first position information is position information corresponding to the fed-back weighting coefficient.
In a specific implementation, the first indication information includes: and the average energy of the broadband is smaller than the index value of the spatial domain wave beam of the first preset threshold value.
In an embodiment of the present invention, the complex weighting factor information determined by the determining unit 41 includes: a third complex weighting coefficient, second position information, and third position information, wherein:
the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix;
the second position information is initial position information of a weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix;
the third position information is initial position information of a weighting coefficient value smaller than or equal to the second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix.
In another embodiment of the present invention, the complex weighting factor information determined by the determining unit 41 includes: a third complex weighting coefficient, second location information, and first duration information, wherein:
the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix;
the second position information is the initial position information of the weighting coefficient value which is greater than a second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix;
the first persistence length information is persistence length information of the weighting coefficient value greater than a second preset threshold.
In another embodiment of the present invention, the complex weighting factor information determined by the determining unit 41 includes: a third complex weighting coefficient, third position information, and second duration information, wherein:
the third complex weighting coefficient is a weighting coefficient value under a frequency domain beam with non-zero amplitude in a one-dimensional vector corresponding to the weighting coefficient matrix;
the third position information is initial position information of a weighting coefficient value smaller than or equal to the second preset threshold value in the one-dimensional vector corresponding to the weighting coefficient matrix;
the second persistence length information is persistence length information of the weighting coefficient value less than or equal to the second preset threshold.
In a specific implementation, the complex weighting factor information determined by the determining unit 41 includes: phase parameter information of different frequency domain wave beams under different space domain wave beams, and amplitude parameter information of different frequency domain wave beams under different space domain wave beams.
In a specific implementation, the spatial beam index information determined by the determining unit 41 includes: the method comprises the steps of determining an index value of a spatial beam of the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam.
The embodiment of the present invention further provides another computer-readable storage medium, where a computer instruction is stored, and when the computer instruction runs, the step of performing any one of the codebook feedback methods in the foregoing embodiments is executed, which is not described herein again.
In particular implementations, the computer-readable storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The embodiment of the present invention further provides a user terminal, where the user terminal may include a memory and a processor, where the memory stores a computer instruction capable of being executed on the processor, and the processor executes any step of the codebook feedback method in the above embodiments when executing the computer instruction, which is not described again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A codebook feedback method, comprising:
determining spatial domain beam index information, frequency domain beam index information and complex weighting coefficient information;
feeding back the determined information;
the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different airspace beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam;
the complex weighting coefficient information includes: first indication information and first complex weighting coefficient information; or, the complex weighting coefficient information includes: first indication information, second complex weighting coefficient information and first position information;
the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; the first complex weighting coefficient information is a weighting coefficient value of the feedback airspace wave beam under each frequency domain wave beam; the second complex weighting coefficient information is a weighting coefficient value of the feedback spatial domain wave beam under the frequency domain wave beam with non-zero amplitude; the first position information is position information corresponding to the fed back weighting coefficient.
2. The codebook feedback method of claim 1, wherein the first indication information comprises: and the average energy of the broadband is smaller than the index value of the spatial domain wave beam of the first preset threshold value.
3. The codebook feedback method as claimed in claim 1, wherein said complex weighting coefficient information comprises: phase parameter information of different frequency domain wave beams under different spatial domain wave beams, and amplitude parameter information of different frequency domain wave beams under different spatial domain wave beams.
4. The codebook feedback method of claim 1, wherein the spatial beam index information comprises: the method comprises the steps of determining an index value of a spatial beam of the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam.
5. A user terminal, comprising:
the determining unit is suitable for determining the spatial domain beam index information, the frequency domain beam index information and the complex weighting coefficient information;
a feedback unit adapted to feedback the determined information;
the spatial beam index information is a spatial beam matrix under a broadband; the frequency domain wave beam index information is a frequency domain wave beam matrix under each space domain wave beam; the complex weighting coefficient information is a weighting coefficient matrix of different frequency domain beams under different airspace beams; the frequency domain beam index information includes: for determining an index value of a frequency domain beam of the frequency domain beam matrix and a first oversampling offset value corresponding to the index value of the frequency domain beam;
the complex weighting coefficient information determined by the determination unit includes: first indication information and first complex weighting coefficient information; or, the complex weighting coefficient information determined by the determining unit includes: first indication information, second complex weighting coefficient information and first position information;
the first indication information is used for indicating index values of the fed-back spatial beams and the non-fed-back spatial beams in the weighting coefficient matrix; the first complex weighting coefficient information is a weighting coefficient value of the fed-back spatial domain wave beam under each frequency domain wave beam; the second complex weighting coefficient information is a weighting coefficient value of the feedback spatial domain wave beam under the frequency domain wave beam with non-zero amplitude; and the first position information is position information corresponding to the fed-back weighting coefficient.
6. The user terminal of claim 5, wherein the first indication information comprises: and the average energy of the broadband is smaller than the index value of the spatial domain wave beam of the first preset threshold value.
7. The ue of claim 5, wherein the complex weighting factor information determined by the determining unit comprises: phase parameter information of different frequency domain wave beams under different spatial domain wave beams, and amplitude parameter information of different frequency domain wave beams under different spatial domain wave beams.
8. The user terminal of claim 5, wherein the spatial beam index information determined by the determining unit comprises: the method comprises the steps of determining an index value of a spatial beam of the spatial beam matrix and a second oversampling offset value corresponding to the index value of the spatial beam.
9. A computer readable storage medium having computer instructions stored thereon for execution by a processor to perform the steps of the method of any one of claims 1 to 4.
10. A user terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the method of any one of claims 1 to 4.
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