WO2018027813A1 - Procédé et appareil de rapport de paramètres de rétroaction - Google Patents

Procédé et appareil de rapport de paramètres de rétroaction Download PDF

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Publication number
WO2018027813A1
WO2018027813A1 PCT/CN2016/094696 CN2016094696W WO2018027813A1 WO 2018027813 A1 WO2018027813 A1 WO 2018027813A1 CN 2016094696 W CN2016094696 W CN 2016094696W WO 2018027813 A1 WO2018027813 A1 WO 2018027813A1
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Prior art keywords
matrix
orthogonal
parameter
channel
base station
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PCT/CN2016/094696
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English (en)
Chinese (zh)
Inventor
张瑞齐
张荻
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华为技术有限公司
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Priority to CN201680087697.8A priority Critical patent/CN109478955A/zh
Priority to PCT/CN2016/094696 priority patent/WO2018027813A1/fr
Publication of WO2018027813A1 publication Critical patent/WO2018027813A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a feedback parameter reporting method and apparatus.
  • LTE Long Term Evolution
  • MIMO Multiple Input and Multiple Output
  • SFBC Space Frequency Block Code
  • Transmission mode to improve cell edge signal to noise ratio.
  • a multi-layer parallel transmission mode is generally used to provide a higher data transmission rate. If the base station obtains all or part of the downlink channel information, precoding processing can be used to improve the signal transmission quality or rate and reduce the feedback load.
  • the downlink precoding weight vector can be estimated according to the uplink channel.
  • the base station side generally obtains a precoding weight matrix by means of a terminal device (abbreviation: UE) feeding back a precoding vector.
  • UE terminal device
  • the purpose of reducing the feedback load is achieved by defining a two-stage codebook feedback mechanism.
  • the feedback precoding vector can be implemented by direct quantization or analog feedback.
  • the channel state information (CSI) is more accurate than the direct quantization feedback mode.
  • the terminal device first performs eigenvalue decomposition on the frequency domain channel (the frequency domain channel can be represented by H) to obtain a feature vector, wherein the dimension of the feature vector and the antenna port of the base station side The number is proportional to each other, and each element in the feature vector is modulated onto a sequence, and the modulated sequence is transmitted to the base station.
  • the dimension of the feature vector can be expressed as N t ⁇ 1
  • N t represents the number of antenna ports on the base station side
  • W(k) is represented as the kth element of the feature vector
  • the terminal device is Each element of the feature vector needs to be reported to the base station during feedback.
  • one sequence may be a resource block (Resource Block, referred to as: One OFDM symbol in RB) is carried, and the kth element in the feature vector is multiplied by the kth column sequence, that is, W(k) ⁇ S k , which is carried by one OFDM symbol of one RB. It can be seen that when the number of antenna ports on the base station side is large, the OFDM symbol bearer required for the terminal device to report the feature vector is increased, which consumes a large amount of uplink resources, and the uplink resource overhead is large.
  • Resource Block referred to as: One OFDM symbol in RB
  • a method and a device for reporting a feedback parameter are provided to solve the problem that when a number of antenna ports on a base station side is large, reporting a feature vector needs to consume a large amount of uplink resources.
  • the embodiment of the present application provides a feedback parameter reporting method, where the method includes:
  • the terminal device acquires an antenna configuration parameter and an orthogonal base generation control parameter that are sent by the base station, and generates at least two orthogonal bases according to the antenna configuration parameter and the orthogonal base generation control parameter, and the structure of each of the orthogonal bases Corresponding to an antenna configuration on the base station side; receiving a downlink channel state information reference signal CSI-RS from the base station, determining a channel parameter according to the CSI-RS; and selecting one of the at least two orthogonal bases according to the channel parameter a target orthogonal basis; extracting a feedback parameter according to the channel parameter and the target orthogonal basis, and reporting the feedback parameter to the base station, where the number of parameters of the feedback parameter is smaller than the channel parameter number.
  • CSI-RS downlink channel state information reference signal
  • the terminal device generates at least two orthogonal bases by using an antenna configuration parameter and an orthogonal base generation control parameter that are sent by the base station, and determines a channel parameter according to the downlink channel state information reference signal sent by the base station, and according to the The channel parameter selects a target orthogonal basis, so that the channel parameter has a small amplitude in the vector or matrix after the target orthogonal basis is mapped, and then the channel parameter can be extracted from the projection of the target orthogonal basis.
  • the larger amplitude value and other information are used as feedback parameters, and the remaining smaller values are discarded, so that the number of parameters in the reported feedback parameters is smaller than the number of parameters in the downlink channel parameters.
  • the value of the feedback parameter is reported to the base station, that is, the number of parameters of the feedback parameter is smaller than the number of the channel parameters, thereby reducing the bearer resources occupied by the uplink feedback and saving resource overhead.
  • the configuration of the selected target orthogonal base is related to the antenna configuration on the base station side, and the target orthogonal basis can make the projection energy of the channel on the orthogonal basis more concentrated on a few points, thereby reducing Discard the error caused by the smaller value and improve the accuracy of the feedback from the terminal device.
  • the antenna configuration parameter includes at least one of the following parameters: a first dimension antenna port number, a second dimension antenna port number, and a base station side polarization antenna a configuration parameter; wherein the polarized antenna configuration comprises a single-polarized antenna and a dual-polarized antenna; the orthogonal basis generation control parameter includes at least one of the following parameters: a number of orthogonal bases of the first dimension, and a second dimension The number of orthogonal bases and the number of orthogonal bases of the polarization direction dimension.
  • the orthogonal basis is represented by multiplying the block diagonal matrix by the first unitary matrix, where Each of the block diagonal matrices
  • the block matrix is a second matrix, and the dimension of the second matrix is N rows and M columns;
  • the first matrix is represented by a row of 2 rows and 2 columns of third matrix and M rows and M columns.
  • the second unitary matrix is represented as a fourth unitary matrix and a fifth unitary matrix.
  • a Kronecker product wherein, the dimension of the fourth unitary matrix is N 1 row M 1 column, the dimension of the fifth matrix is N 2 rows and M 2 columns, and N 1 represents a polarization direction
  • N 2 represents the number of second-dimensional antenna ports in one polarization direction
  • M 1 ⁇ N 1 , M 2 ⁇ N 2 if the antenna port on the base station side is configured as a two-dimensional antenna port, the second unitary matrix is represented as a fourth unitary matrix and a fifth unitary matrix.
  • the generated orthogonal basis representation for:
  • the generated orthogonal basis is expressed as:
  • B (k, l, k'l', m) represents the orthonormal basis of the parameter k, l, k', l', m, and U k and U k ' respectively represent the unitary matrix of N 1 ⁇ M 1
  • V l and V l ' respectively represent a unitary matrix of N 2 ⁇ M 2
  • T m represents a 2 ⁇ 2 unitary matrix
  • I represents a unit matrix of (M 1 M 2 ) ⁇ (M 1 M 2 )
  • O 1 represents the number of orthogonal bases of the first dimension
  • O 2 represents the number of orthogonal bases of the second dimension
  • O 3 represents the number of orthogonal bases of the polarization direction dimension.
  • the unitary matrix U k is expressed as
  • the unitary matrix T m is expressed as
  • k is an integer, 0 ⁇ k ⁇ N x .
  • the selecting, by the terminal device, the one of the at least two orthogonal bases as the target orthogonal basis according to the channel parameter includes: the terminal device uses the channel parameter in each Projecting on the orthogonal basis, generating a projection matrix, and projecting the at least two orthogonal bases to generate a set of projection matrices, wherein each projection matrix is composed of S elements, and the terminal device is in each Selecting L elements of larger values from the projection matrix, and calculating a sum of the selected L larger element values; comparing the sum of the L larger element values calculated in all projection matrices, and selecting the The largest projection matrix among the sum of the L larger element values is the most selected target orthogonal basis.
  • the terminal device performs the projection of the channel parameter on each of the orthogonal bases to generate a projection matrix, including:
  • the channel parameter is a channel matrix
  • the dimension of the channel matrix is represented by a Nr row Nt column, where Nt represents a total number of antenna ports on the base station side, Nr represents the total number of antenna ports received by the terminal device
  • the channel parameter is a channel correlation matrix
  • the dimension of the channel correlation matrix is represented as Nt row Nt column
  • the channel parameter is the channel matrix
  • the dimension of the feature vector is represented as R x N t , where R represents the rank of the channel matrix.
  • the method further includes: the terminal device numbers all orthogonal bases; and the feedback parameters extracted by the terminal device include : a number of the target orthogonal basis, L corresponding large element values in the target orthogonal basis, and a position index of the L larger element values in the projection matrix.
  • reporting the feedback parameter to the base station includes: in the feedback parameter, Transmitting, by the terminal device, a number of the target orthogonal base in a subframe, and a position index of the L larger element values in the projection matrix; a broadband of the entire system is composed of at least two subbands, The terminal device reports the L larger element values for each of the sub-bands.
  • the wideband reports the orthogonal base index and the selected amplitude larger value location index. Since the location index is applicable to the entire bandwidth, it does not add too much resource overhead to the LTE system.
  • the CSI of each sub-band is characterized by the L amplitudes of the feedback parameters, and does not cause too much performance loss.
  • the embodiment of the present application provides a downlink access method, where the method is applied to a base station side, where the method includes: setting, by the base station, an antenna configuration parameter and an orthogonal base generation control parameter, where the antenna configuration parameter is at least
  • the method includes the following parameters: a first dimension antenna port number, a second dimension antenna port number, and a base station side polarization antenna configuration parameter;
  • the orthogonal basis generation control parameter includes at least one of the following parameters: a first dimension orthogonal The number of bases, the number of orthogonal bases of the second dimension and the number of orthogonal bases of the polarization direction dimension; the base station transmits the antenna configuration parameters and orthogonal base generation control to the terminal device through static or semi-static signaling parameter.
  • the base station generates the control parameters by transmitting the antenna configuration parameter and the orthogonal basis, so that the terminal device can generate a set of orthogonal bases, and then, after the downlink channel parameters are projected on the orthogonal basis, the energy energy is concentrated in a minority. On the elements. With different orthogonal bases, the energy concentrated on a few elements is different.
  • the base station further includes: sending, by the base station, a downlink channel state information reference signal CSI-RS to the terminal And a device, configured to determine, by the terminal device, a channel parameter according to the CSI-RS.
  • the channel parameter is projected on the orthogonal basis, so that the terminal device can selectively report a part of the larger value to the base station, so as to prevent all the element values from being reported to the base station, and the uplink resource overhead is increased.
  • the base station receives the feedback parameter that is sent by the terminal device, where the feedback parameter includes: a number of the selected target orthogonal basis, and a projection L on the target orthogonal basis a larger element value, and a projection position index corresponding to the L larger element values; acquiring the target orthogonal basis according to the number of the target orthogonal basis in the feedback parameter; The projection position index corresponding to the element value acquires L row vectors or L column vectors of the target orthogonal basis; and acquires channel parameters according to the L larger element values and the L row vectors or L column vectors.
  • the method further includes: generating a precoding matrix for the terminal device according to the channel parameter.
  • the target orthogonal basis is expressed as:
  • the target orthogonal basis is expressed as:
  • B (k, l, k'l', m) represents the orthonormal basis of the parameter k, l, k', l', m, and U k and U k ' respectively represent the unitary matrix of N 1 ⁇ M 1
  • V l and V l ' respectively represent a unitary matrix of N 2 ⁇ M 2
  • T m represents a 2 ⁇ 2 unitary matrix
  • I represents a unit matrix of (M 1 M 2 ) ⁇ (M 1 M 2 )
  • O 1 represents the number of orthogonal bases of the first dimension
  • O 2 represents the number of orthogonal bases of the second dimension
  • O 3 represents the number of orthogonal bases of the polarization direction dimension.
  • the unitary matrix U k is expressed as
  • the unitary matrix T m is expressed as
  • k is an integer, 0 ⁇ k ⁇ N x .
  • the channel parameter is a channel matrix
  • a dimension of the channel matrix is represented as a N r row N t column, where N t represents a base station The total number of side antenna ports, N r represents the total number of antenna ports received by the terminal device
  • the channel parameter is a channel correlation matrix
  • the dimension of the channel correlation matrix is represented as N t rows and N t columns
  • the channel parameter is a feature vector of the channel matrix, and the dimension of the feature vector is represented as R ⁇ N t , where R represents the rank of the channel matrix.
  • the embodiment of the present application further provides a terminal device, including a receiver, a transmitter, and a processor, where the receiver is configured to acquire an antenna configuration parameter and an orthogonal base generation control parameter that are sent by the base station;
  • the antenna configuration parameter includes at least one of the following parameters: a first dimension antenna port number, a second dimension antenna port number, and a base station side polarization antenna configuration parameter; wherein the polarized antenna configuration includes a unipolar And an orthogonal antenna;
  • the orthogonal basis generation control parameter includes at least one of the following parameters: a first dimension orthogonal basis The number of orthogonal bases of the second dimension and the number of orthogonal bases of the polarization direction dimension.
  • the processor is configured to generate at least two orthogonal bases according to the antenna configuration parameter and the orthogonal basis generation control parameter, where the configuration of each orthogonal base is related to an antenna configuration on a base station side;
  • the receiver is further configured to receive a downlink channel state information reference signal CSI-RS from a base station, where the processor is further configured to determine a channel parameter according to the CSI-RS; according to the channel parameter, in the at least two positive Selecting one of the intersection bases as a target orthogonal basis; and extracting feedback parameters according to the channel parameters and the target orthogonal basis;
  • CSI-RS downlink channel state information reference signal
  • the transmitter is configured to report the feedback parameter to the base station, where the number of parameters of the feedback parameter is smaller than the number of the channel parameters.
  • the processor is further configured to: project the channel parameter on each of the orthogonal bases to generate a projection matrix, for the at least two The orthogonal basis is used to generate a set of projection matrices, wherein each projection matrix is composed of S elements, L elements of larger values are selected in each of the projection matrices, and L selected larger are calculated.
  • the sum of the element values compare the sum of the L larger element values calculated in all projection matrices, and select the largest projection matrix of the sum of the L larger element values, the most selected target orthogonal basis .
  • the transmitter is specifically configured to report the number of the target orthogonal base in one subframe, and the L a position index of a larger element value in the projection matrix; reporting the L larger element values for each sub-band, wherein the bandwidth of the entire system is composed of at least two sub-bands.
  • terminal device is also used to implement the various implementations of the first aspect and the first aspect described above.
  • the embodiment of the present application further provides a base station, including a processor and a transmitter, where the processor is configured to set an antenna configuration parameter and an orthogonal base generation control parameter, where the antenna configuration parameter includes at least The following parameters are: a first dimension antenna port number, a second dimension antenna port number, and a base station side polarization antenna configuration parameter; and the orthogonal basis generation control parameter includes at least one of the following parameters: a first dimension orthogonal basis Number of orthogonal bases of the second dimension and the number of orthogonal bases of the polarization direction dimension; the transmitter is configured to send the antenna configuration parameter and orthogonal base generation to the terminal device through static or semi-static signaling Control parameters.
  • the transmitter is further configured to send a downlink channel state information reference signal CSI-RS to the terminal device, so that the terminal device determines the channel according to the CSI-RS. parameter.
  • CSI-RS downlink channel state information reference signal
  • the base station further includes a receiver, where the receiver is configured to receive the feedback parameter by the terminal device, where the feedback parameter includes: selecting a number of target orthogonal bases, L larger element values projected on the target orthogonal basis, and the L larger element values Corresponding projection position index;
  • the processor is further configured to: acquire the target orthogonal basis according to a number of a target orthogonal basis in the feedback parameter; and acquire the target orthogonal basis according to a projection position index corresponding to the L larger element values L row vectors or L column vectors; acquire channel parameters according to L larger element values and the L row vectors or L column vectors.
  • the processor is further configured to generate a precoding matrix for the terminal device according to the channel parameter.
  • the base station is further configured to implement various implementations in the second aspect and the second aspect described above.
  • the embodiment of the present application further provides a computer storage medium, wherein the computer storage medium can store a program, and the program can be implemented in a implementation manner of the feedback parameter reporting method and apparatus. Some or all of the steps.
  • FIG. 1 is a schematic structural diagram of a resource block according to an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a feedback parameter reporting method according to an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a subband division according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of a dual-polarized antenna according to an embodiment of the present application.
  • FIG. 5 is a flowchart of another feedback parameter reporting method according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of signal interaction between a base station and a terminal device according to an embodiment of the present disclosure.
  • the technical solutions provided by the present application are mainly applied to an LTE system and a 5G system, and the main application scenario thereof is Application of downlink MIMO technology.
  • WI work development phase
  • CSI downlink channel state information
  • the estimated feature vector of the downlink channel or the downlink channel is fed back to the base station, but when When the number of antenna ports on the base station side is large, for example, 16 antenna ports or more, the uplink device that the terminal device feeds back the feature vector or matrix of the downlink channel is large.
  • the embodiment of the present application provides a method and device for reporting a feedback parameter, which is applied to the terminal device side. As shown in FIG. 2, the method includes the following steps:
  • Step 201 The terminal device acquires an antenna configuration parameter and an orthogonal base generation control parameter that are sent by the base station.
  • the antenna configuration parameter includes at least one of the following parameters: a first dimension antenna port number, a second dimension antenna port number, and a base station side polarization antenna configuration parameter; wherein the polarized antenna configuration includes a single polarization antenna And a dual-polarized antenna; the orthogonal basis generation control parameter includes at least one of the following parameters: the number of orthogonal bases of the first dimension, the number of orthogonal bases of the second dimension, and the orthogonal basis of the polarization direction dimension number.
  • Step 202 The terminal device generates at least two orthogonal bases according to the antenna configuration parameter and the orthogonal basis generation control parameter, and the configuration of each of the orthogonal bases is related to an antenna configuration on the base station side.
  • the expression of the generated orthogonal base is also different according to the antenna configuration parameters of the base station side.
  • the orthogonal basis is represented by multiplying a block diagonal matrix and a first unitary matrix, wherein each block matrix in the block diagonal matrix is a second unitary matrix, The dimension of the second unitary matrix is N rows and M columns;
  • the first unitary matrix is represented by a Kroneck product of a unit matrix of a third matrix of 2 rows and 2 columns and a matrix of M rows and M columns;
  • the orthogonal basis is represented as the second unitary matrix, where N represents the number of antenna ports in one polarization direction, and M ⁇ N.
  • the second unitary matrix is represented as a Kronecker product of the fourth unitary matrix and the fifth unitary matrix; wherein, the fourth unitary matrix
  • the dimension is N 1 row M 1 column
  • the dimension of the fifth matrix is N 2 rows and M 2 columns
  • N 1 represents the number of antenna ports of the first dimension in one polarization direction
  • N 2 represents the number of antennas in one polarization direction.
  • B (k, l, k'l', m) represents the orthonormal basis of the parameter k, l, k', l', m, and U k and U k ' respectively represent the unitary matrix of N 1 ⁇ M 1 , V l and V l ' respectively represent a ⁇ matrix of N 2 ⁇ M 2 , T m represents a 2 ⁇ 2 ⁇ matrix, U k , V l and T m are ⁇ matrices, and I represents (M 1 M 2 ) ⁇ Unit array of (M 1 M 2 ), Represents Kroneck multiplication, and k,k' ⁇ 0,1, ⁇ O 1 -1 ⁇ ,l,l' ⁇ 0,1, ⁇ O 2 -1 ⁇ ,m ⁇ 0,1, ⁇ O 3 -1 ⁇ , O 1 represents the number of orthogonal bases of the first dimension, O 2 represents the number of orthogonal bases of the second dimension, and O 3 represents the number of orthogonal bases of the polarization direction dimension.
  • B (k, l, m) denotes an orthogonal basis of parameters k, l, m
  • U k denotes a unitary matrix of N 1 ⁇ M 1
  • V l denotes a unitary matrix of N 2 ⁇ M 2
  • the unitary matrix U k can be expressed as The unitary matrix V l can be expressed as The unitary matrix T m can be expressed as among them, a DFT or inverse DFT matrix representing N x ⁇ N x , ie Specifically expressed as:
  • Step 203 The terminal device receives a downlink channel state information reference signal (abbreviation: CSI-RS) from the base station, and determines a channel parameter according to the CSI-RS.
  • CSI-RS downlink channel state information reference signal
  • the channel parameter is a channel matrix
  • the dimension of the channel matrix is represented by N r rows and N t columns, where N t represents the total number of transmitting antenna ports of the base station side, and N r represents the terminal device.
  • the channel parameter is a channel correlation matrix RR
  • the dimension is expressed as N t ⁇ N t .
  • the channel parameter is a feature vector of the channel matrix
  • Step 204 The terminal device selects one of the at least two orthogonal bases as the target orthogonal basis according to the channel parameter.
  • the process of selecting a target orthogonal basis comprises: the terminal device projecting the channel parameter on each of the orthogonal bases, and generating a projection matrix for the at least two orthogonal Base projection produces a set of projection matrices, where each projection matrix consists of S elements.
  • the terminal device selects L elements of a larger value in each of the projection matrices, and calculates a sum of the selected L larger element values;
  • the sum of the L larger element values calculated in all projection matrices is compared, and the largest projection matrix among the sum of the L larger element values is selected as the selected target orthogonal basis.
  • the processing procedure on the terminal device side will be described.
  • H is the downlink channel
  • U is the ⁇ matrix of the dimension N r ⁇ N r
  • ⁇ represents the diagonal matrix of the dimension N r ⁇ N t
  • the diagonal element is the eigenvalue of the matrix
  • V is N t ⁇ N t
  • each projection matrix is composed of S elements, and L larger ones are selected in each of the projection matrices
  • the element of the value and calculates the sum of the selected L larger element values; compares the sum of the L larger element values calculated in all projection matrices, and selects the largest of the sum of the L larger element values
  • the projection matrix is the most selected target orthogonal basis, Or called the optimal orthogonal basis.
  • the terminal device selects a target orthogonal basis among a set of orthogonal bases according to the feature vector W, that is, the target orthogonal base causes a larger amount of energy to be concentrated in a few projections of the feature vector W on the orthogonal basis Point. That is, the terminal device determines the feedback parameters k, k'l, l', m in the orthogonal basis according to the feature vector W, thereby obtaining the target orthogonal basis B (k, l, k'l', m) .
  • Step 205 The terminal device extracts a feedback parameter according to the channel parameter and the target orthogonal basis, and reports the feedback parameter to the base station, where the number of parameters of the feedback parameter is smaller than the channel parameter. number.
  • the channel parameter G is projected to the target orthogonal basis
  • B (k, l, k'l', m) denotes an orthogonal basis of parameters k, l, k', l', m
  • G denotes the channel parameter.
  • E denotes a projection matrix
  • the dimension of the projection matrix E is represented as R ⁇ N t
  • the projection matrix E has L values having a large amplitude
  • the method further includes numbering all the orthogonal bases generated.
  • the feedback parameter extracted in step 205 includes: a number of the target orthogonal basis, L corresponding large element values in the target orthogonal basis, and the L larger element values in the projection matrix The location index I L .
  • the L large values may be reported to the base station by means of analog feedback, or may be reported to the base station by direct quantization.
  • the terminal device generates at least two orthogonal bases by using an antenna configuration parameter and an orthogonal basis generation control parameter that are sent by the base station, where the orthogonal basis is used to concentrate the downlink channel parameter energy on a few elements.
  • the channel parameter is determined according to the downlink channel state information reference signal sent by the base station, and a target orthogonal basis is selected according to the channel parameter, so that the channel parameter has a small amplitude in the vector or matrix after the target orthogonal basis is mapped.
  • the value may further extract the information such as the larger amplitude value from the target orthogonal basis as the feedback parameter, and the remaining smaller values are discarded, so that the number of parameters in the reported feedback parameter is less than the number of parameters in the channel parameter.
  • the value of the feedback parameter is reported to the base station, that is, the number of parameters of the feedback parameter is smaller than the number of the channel parameters, thereby reducing the bearer resources occupied by the uplink feedback and saving resource overhead.
  • the configuration of the selected target orthogonal base is related to the antenna configuration on the base station side, and the target orthogonal basis
  • the projection energy of the channel on the orthogonal basis can be more concentrated on a few points, so that the error caused by the value of the smaller abandonment can be reduced, and the accuracy of the feedback of the terminal device can be improved.
  • reporting the feedback parameter to the base station includes:
  • the terminal device reports the number of the target orthogonal base in one subframe, and the position index of the L larger element values in the projection matrix; the bandwidth of the entire system is at least Two sub-bands are formed, and the terminal device reports the L larger element values for each of the sub-bands.
  • the bandwidth of the entire LTE system is composed of several sub-bands.
  • the terminal device selects a target orthogonal base and an index of L larger values for the entire LTE system bandwidth. Position; on each subband, the channel parameter G of the corresponding subband is projected on the selected target orthogonal basis, and the projection of the subband G is indexed at the L position, the value of each subband The larger value is reported to the base station.
  • FIG. 3 it is a schematic structural diagram of subband division, and the bandwidth of the LTE system is 10 MHz.
  • the system bandwidth is divided into 9 sub-bands.
  • the terminal device estimates the channel according to the CSI-RS sent by the base station. Based on the estimated channel, the terminal device selects an optimal orthogonal base B, that is, the target orthogonal base, in other words, the target orthogonal base B is applied to the entire 10 MHz system bandwidth.
  • E1, E2, ... E9 L of the larger values are respectively selected, wherein the positions of the selected L values are the same for E1, E2, ..., E9, so the L values
  • the location index applies to the entire 10MHz system bandwidth.
  • the wideband reports the orthogonal base number and the selected amplitude larger value location index. Since the location index is applicable to the entire bandwidth, it does not add too much resource overhead to the LTE system.
  • the CSI of each subband is characterized by the L amplitudes of the feedback parameters, further reducing the performance loss of the feedback.
  • the present application further provides a downlink access method, where the method is located before the foregoing step 201, and the specific steps include:
  • the base station sets antenna configuration parameters and orthogonal base generation control parameters.
  • the antenna configuration parameter includes: a number of antenna ports of a first dimension, which may be represented by N 1 ; a number of antenna ports of a second dimension, which may be represented by N 2 ; and a configuration parameter of a polarized antenna of the base station, which may be represented by N 3 ;
  • the orthogonal basis generation control parameter includes: the number of orthogonal bases of the first dimension, which can be represented by O 1 ; the number of orthogonal bases of the second dimension, which can be represented by O 2 ; and the orthogonal basis of the polarization direction dimension The number can be expressed by O 3 .
  • the base station sends the set antenna configuration parameter and the orthogonal base generation control parameter to the terminal device through static or semi-static signaling.
  • the base station sends the number of orthogonal bases to be sent to the terminal device through configuration parameters. For example, for the lower line antenna structure, the base station needs to send the number N 1 of the horizontal dimension and the polarization direction antenna port, and the number of the vertical dimension of the same polarization antenna port N 2 , and the polarization dimension N 3 of the antenna to the terminal. device. And selecting, in the horizontal direction, the vertical direction and the polarization direction, the number of orthogonal bases to be selected, so that the terminal device receives the antenna configuration parameter and the orthogonal basis generation control parameter, and according to the antenna configuration parameter and the orthogonal basis Generating control parameters generates at least two orthogonal bases, each of which is constructed in relation to an antenna configuration on the base station side.
  • FIG. 4 is a schematic structural diagram of a dual-polarized antenna, showing an antenna structure in a dual polarization direction.
  • N 1 4
  • N 1 4
  • the static mode means that the base station sends the antenna port configuration parameter and the orthogonal base generation control parameter to the terminal by using Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the parameters are not changed after being sent to the terminal device terminal, and are called static configuration mode. If the base station changes the configuration and control parameters through RRC signaling after a period of time, the configuration mode is called semi-static. Configuration method.
  • the method further includes:
  • the base station sends a downlink channel state information reference signal CSI-RS to the terminal device, so that the terminal device determines the channel parameter according to the CSI-RS.
  • the base station sends the CSI-RS to the terminal device at a certain time, for example, after receiving the feedback signal that the terminal device generates a set of orthogonal bases.
  • the base station sends the CSI-RS to the terminal device, so that the terminal device can extract the feedback parameter according to the channel parameter and the target orthogonal basis, and then report some parameters to the base station to reduce the number of antenna ports on the base station side.
  • the cost of the uplink resource is increased, and the existing terminal device is prevented from reporting all the feature vectors or the number of antenna ports to the terminal device.
  • the receiving by the terminal device, reporting a feedback parameter, where the feedback parameter includes: the selected target is positive a number of the base, L larger element values projected on the target orthogonal basis, and a projection position index corresponding to the L larger element values;
  • the method further includes: generating a precoding matrix for the terminal device according to the channel parameter, and applying the precoding matrix to the data channel, and then sending the CSI-RS to the terminal device.
  • the target orthogonal base is expressed as:
  • the target orthogonal basis is expressed as:
  • B (k, l, k'l', m) represents the orthonormal basis of the parameter k, l, k', l', m, and U k and U k ' respectively represent the unitary matrix of N 1 ⁇ M 1 , V l and V l ' respectively represent a unitary matrix of N 2 ⁇ M 2 , T m represents a 2 ⁇ 2 unitary matrix, and I represents a unit matrix of (M 1 M 2 ) ⁇ (M 1 M 2 ), Represents Kroneck multiplication, and k,k' ⁇ 0,1, ⁇ O 1 -1 ⁇ ,l,l' ⁇ 0,1, ⁇ O 2 -1 ⁇ ,m ⁇ 0,1, ⁇ O 3 - 1 ⁇ , O 1 represents the number of orthogonal bases of the first dimension, O 2 represents the number of orthogonal bases of the second dimension, and O 3 represents the number of orthogonal bases of the polarization direction dimension.
  • the unitary matrix T m is expressed as
  • k is an integer, 0 ⁇ k ⁇ N x .
  • the matrix or expression provided by the present application is only one expression of the orthogonal basis provided in the present application, including but not limited to the above expression, and other expressions or formulas are also possible.
  • the channel parameter is a channel matrix
  • the dimension of the channel matrix is represented as N r rows and N t columns, where N t represents the total number of antenna ports on the base station side, and N r represents the received by the terminal device. a total number of antenna ports
  • the channel parameter is a channel correlation matrix
  • the dimension of the channel correlation matrix is represented as N t rows N t columns
  • the channel parameters are feature vectors of the channel matrix
  • the dimension of the feature vector is denoted as R x N t , where R represents the rank of the channel matrix.
  • the process of implementing feedback parameter generation and forwarding between the base station and the terminal device includes:
  • Step 501 The base station sets an antenna configuration parameter and an orthogonal base generation control parameter.
  • Step 502 The base station sends the antenna configuration parameter and the orthogonal base generation control parameter to the terminal device.
  • Step 503 The terminal device receives the parameter, and generates a set of orthogonal bases according to the parameters, where the set of orthogonal bases includes at least two orthogonal bases, and the configuration of each of the orthogonal bases is related to an antenna configuration on the base station side.
  • the antenna is a single-polarized antenna and a dual-polarized antenna, and the number of antenna ports corresponding to different polarized antennas is different;
  • Step 504 The base station sends a CSI-RS to the terminal device.
  • Step 505 The terminal device receives a CSI-RS from the base station, and determines a channel parameter according to the CSI-RS.
  • Step 506 The terminal device selects one of the at least two orthogonal bases as a target orthogonal basis according to the channel parameter, so that a small number of eigenvectors or matrices are mapped in the target orthogonal basis (L).
  • the amplitude of the amplitude is larger, and the rest of the values are smaller amplitudes. Because the larger value represents a larger energy, the projection energy of the downlink channel on the orthogonal basis is concentrated in a few (L) points. In position, it is possible to reduce the error caused by the smaller value of the discarding amplitude.
  • Step 507 The terminal device extracts a feedback parameter according to the channel parameter and the target orthogonal basis, where the number of parameters of the feedback parameter is smaller than the number of the channel parameters, that is, the base station side included in the reported feedback parameter.
  • the number of antenna ports is smaller than the number of antenna ports included in the channel parameter;
  • the feedback parameter includes: a number of the target orthogonal base, L corresponding large element values in the target orthogonal base, and the The position index of the L larger element values in the projection matrix.
  • Step 508 Report the feedback parameter to the base station.
  • the method further includes: the base station receiving the feedback parameter sent by the terminal device, acquiring the target orthogonal basis according to the number of the target orthogonal base in the feedback parameter; and mapping according to the L larger element values
  • the position index acquires L row vectors or L column vectors of the target orthogonal basis; and acquires channel parameters according to the L larger element values and the L row vectors or L column vectors. And generating a precoding matrix for the terminal device according to the channel parameter.
  • the base station generates control parameters by transmitting antenna configuration parameters and orthogonal bases, so that the terminal device can generate a set of orthogonal bases, and then divide the feature vectors of the downlink channels into different values.
  • the terminal device selects a target orthogonal base in the generated orthogonal basis by using the CSI-RS. Since the target orthogonal basis makes the feature vector or the downlink channel after mapping, more energy is concentrated in a few locations, that is, a minority The magnitude of the larger value, and then by extracting and reporting the feedback parameters such as a small number of larger values, discarding the remaining smaller values, thereby avoiding reporting each element of the feature vector to the base station, thereby reducing the uplink feedback. Overhead, and also the ability to reduce performance misses due to smaller values of discarding.
  • the wideband reports the orthogonal base index and the selected amplitude larger position index. Since the location index is applicable to the entire bandwidth, it does not add too much resource overhead to the LTE system.
  • the CSI of each sub-band is characterized by the L amplitudes of the feedback parameters, and does not cause too much performance loss.
  • the terminal device 600 includes: a receiving unit 601, a processing unit 602, and Transmitting unit 603.
  • the receiving unit 601 is configured to acquire an antenna configuration parameter and an orthogonal base generation control parameter that are sent by the base station, where the antenna configuration parameter includes at least one of the following parameters: a first dimension antenna port number, and a second dimension antenna port number. And a base station side polarization antenna configuration parameter; wherein the polarization antenna configuration comprises a single polarization antenna and a dual polarization antenna; the orthogonal basis generation control parameter includes at least one of the following parameters: a first dimension orthogonal basis The number of orthogonal bases of the second dimension and the number of orthogonal bases of the polarization direction dimension.
  • the processing unit 602 is configured to generate, according to the antenna configuration parameter and the orthogonal basis generation control parameter, at least two orthogonal bases, where the configuration of each orthogonal base is related to an antenna configuration on the base station side;
  • the orthogonal basis is represented by multiplying a block diagonal matrix and a first ⁇ matrix, wherein each block matrix in the block diagonal matrix is a second ⁇ matrix
  • the dimension of the second unitary matrix is N rows and M columns
  • the first unitary matrix is represented by a Kroneck product of a unit matrix of a third matrix of 2 rows and 2 columns and an M matrix of M columns;
  • the orthogonal base is represented as the second unitary matrix, where N represents the number of antenna ports in one polarization direction, and M ⁇ N.
  • the second unitary matrix is represented as a Kronecker product of the fourth unitary matrix and the fifth unitary matrix; wherein the dimension of the fourth unitary matrix is N 1 row M 1 column, the dimension of the fifth unitary matrix is N 2 rows and M 2 columns, N 1 represents the number of antenna ports of the first dimension in one polarization direction, and N 2 represents the antenna of the second dimension in one polarization direction The number of ports, and M 1 ⁇ N 1 , M 2 ⁇ N 2 .
  • the receiving unit 601 is further configured to receive a downlink channel state information reference signal CSI-RS from the base station;
  • the processing unit 602 is further configured to determine a channel parameter according to the CSI-RS, and select, according to the channel parameter, one of the at least two orthogonal bases as a target orthogonal base; according to the channel parameter and the Target orthogonal basis extracts feedback parameters,
  • the sending unit 603 is further configured to report the feedback parameter to the base station, where the number of parameters of the feedback parameter is smaller than the number of the channel parameters.
  • processing unit 602 is further configured to number all orthogonal bases
  • the feedback parameter extracted by the terminal device includes: a number of the target orthogonal basis, L corresponding large element values in the target orthogonal basis, and the L larger element values in the projection matrix The location index in .
  • the generated orthogonal basis is expressed as:
  • the generated orthogonal basis is expressed as:
  • B (k, l, k'l', m) represents the orthonormal basis of the parameter k, l, k', l', m, and U k and U k ' respectively represent the unitary matrix of N 1 ⁇ M 1 , V l and V l ' respectively represent a ⁇ matrix of N 2 ⁇ M 2 , T m represents a 2 ⁇ 2 ⁇ matrix, U k , V l and T m are ⁇ matrices, and I represents (M 1 M 2 ) ⁇ Unit array of (M 1 M 2 ), Represents Kroneck multiplication, and k,k' ⁇ 0,1, ⁇ O 1 -1 ⁇ ,l,l' ⁇ 0,1, ⁇ O 2 -1 ⁇ ,m ⁇ 0,1, ⁇ O 3 -1 ⁇ , O 1 represents the number of orthogonal bases of the first dimension, O 2 represents the number of orthogonal bases of the second dimension, and O 3 represents the number of orthogonal bases of the polarization direction dimension.
  • the unitary matrix V l is expressed as
  • the unitary matrix T m is expressed as
  • k is an integer, 0 ⁇ k ⁇ N x .
  • processing unit 602 is specifically configured to:
  • each projection matrix is composed of S elements composition
  • the sum of the L larger element values calculated in all projection matrices is compared, and the largest projection matrix among the sum of the L larger element values is selected as the selected target orthogonal basis.
  • B (k, l, k'l', m) denotes an orthogonal basis of parameters k, l, k', l', m
  • G denotes the channel parameter
  • the channel parameter is a channel matrix
  • the dimension of the channel matrix is represented as N r rows and N t columns, where N t represents the total number of antenna ports on the base station side, and N r represents the received by the terminal device. The total number of antenna ports;
  • the channel parameter is a channel correlation matrix
  • the dimension of the channel correlation matrix is represented as N t rows N t columns
  • the channel parameter is a feature vector of the channel matrix
  • the dimension of the feature vector is represented as R x N t , where R represents the rank of the channel matrix.
  • the sending unit 603 is further configured to: in the feedback parameter, the terminal device reports a number of the target orthogonal base in one subframe, and the L larger element values are in the projection matrix Position index in the whole system; the broadband of the entire system is composed of at least two sub-bands, and the L larger element values are reported for each of the sub-bands.
  • a terminal device in order to reduce the uplink feedback overhead, mapping a vector or a matrix representing the downlink channel on a target orthogonal basis, so that a small amount of amplitude is present in the mapped vector or matrix.
  • the remaining smaller amplitude values are discarded, and the overhead of the uplink feedback channel resources is reduced because the larger amplitude value is reported to the base station.
  • the configuration of the selected orthogonal basis of the target is related to the antenna form of the base station.
  • a target orthogonal basis can make the projection of the channel on the orthogonal basis can be concentrated on a few points, thereby reducing the error caused by the smaller value of the discarding amplitude.
  • a base station is further provided. As shown in FIG. 7, the base station includes: a receiving unit 701, a processing unit 702, and a sending unit 703.
  • the processing unit 702 is configured to set an antenna configuration parameter and an orthogonal base generation control parameter, where the antenna configuration parameter includes at least one of the following parameters: a first dimension antenna port number, a second dimension antenna port number, and Base station side polarization antenna configuration parameter; the orthogonal basis generation control parameter includes at least one of the following parameters: the number of orthogonal bases of the first dimension, the number of orthogonal bases of the second dimension, and the orthogonal basis of the polarization direction dimension The number of.
  • the sending unit 703 is configured to send the antenna configuration parameter and the orthogonal base generation control parameter to the terminal device by using static or semi-static signaling.
  • the sending unit 703 is further configured to send a downlink channel state information reference signal CSI-RS to the terminal device, so that the terminal device determines the channel parameter according to the CSI-RS.
  • CSI-RS downlink channel state information reference signal
  • the receiving unit 701 is configured to receive, by the terminal device, a feedback parameter, where the feedback parameter includes: a number of the selected target orthogonal basis, L large element values projected on the target orthogonal basis, and a projection position index corresponding to the L larger element values;
  • the processing unit 702 is further configured to: acquire the target orthogonal basis according to a number of a target orthogonal basis in the feedback parameter; and acquire the target according to a projection position index corresponding to the L larger element values L row vectors or L column vectors of the basis; the channel parameters are obtained according to the L larger element values and the L row vectors or L column vectors.
  • the processing unit 702 is further configured to generate a precoding matrix for the terminal device according to the channel parameter, and apply the data to the data channel.
  • the terminal device provided in this embodiment corresponds to the foregoing embodiment of the downlink access method. Therefore, the processing unit, the receiving unit, and the sending unit are further configured to implement all or part of the steps in the downlink access method.
  • each base station and terminal device includes: a receiver, a processor, and a transmitter.
  • each processor further includes a memory.
  • the processor may be a general purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more An integrated circuit that controls the execution of the program of the present invention.
  • CPU general purpose central processing unit
  • ASIC application-specific integrated circuit
  • the memory can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of information and instructions that can be stored.
  • the dynamic storage device may also be an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical disc storage, or a disc storage device ( Including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer Any other media taken, but not limited to this.
  • the memory can exist independently or be integrated with the processor. Wherein, the memory is used to store application code for executing the solution of the present invention, and is controlled by a processor.
  • the processor is configured to execute application code stored in the memory.
  • the processor in the base station side further includes a setting unit, where the setting unit is configured to set an antenna configuration parameter and an orthogonal base generation control parameter, where the antenna configuration parameter includes at least one of the following parameters: The number of the dimension antenna ports, the number of the second dimension antenna ports, and the base station side polarization antenna configuration parameters; the orthogonal basis generation control parameter includes at least one of the following parameters: the number of orthogonal bases of the first dimension, the second dimension The number of orthogonal bases and the number of orthogonal bases of the polarization direction dimension.
  • the terminal device described in this application is used to implement all or part of the function of the feedback parameter reporting method in the foregoing embodiment.
  • the base station is used to implement all or part of the function implementation of a downlink access method in the foregoing embodiment.
  • the terminal device described in this application includes a user equipment (abbreviation: UE), a user terminal, a client, and the like. Specifically, the terminal device further includes: a mobile phone, a tablet computer, a palmtop computer, or a mobile internet device.
  • UE user equipment
  • the terminal device further includes: a mobile phone, a tablet computer, a palmtop computer, or a mobile internet device.
  • a “unit” in the above embodiments may refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or the like.
  • a device that can provide the above functions.
  • the embodiment of the present invention further provides a computer storage medium for storing the computer software instructions used in the feedback parameter reporting method or the downlink access method shown in FIG. 6 or FIG. 7 , which includes an embodiment for performing the foregoing method.
  • the transmission of feedback parameters can be implemented by executing a stored program.
  • embodiments of the present invention can be provided as a method, apparatus (device), or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • the computer program is stored/distributed in a suitable medium, provided with other hardware or as part of the hardware, or in other distributed forms, such as over the Internet or other wired or wireless telecommunication systems.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

La présente invention concerne un procédé et un appareil de rapport de paramètres de rétroaction. Le procédé comprend les étapes suivantes : un équipement utilisateur acquiert des paramètres de configuration de modèle d'antenne et des paramètres de commande de génération de base orthonormée envoyés par une station de base ; génère au moins deux bases orthonormées sur la base de ces paramètres, la construction de chacune des bases orthonormées étant associée au modèle d'antenne du côté station de base ; reçoit un signal de référence d'informations d'état de canal de liaison descendante (CSI-RS) à partir de la station de base, et détermine des paramètres de canal selon le CSI-RS ; sélectionne une base orthonormée cible ; extrait des paramètres de rétroaction en fonction des paramètres de canal et de la base orthonormée cible, et les rapporte à la station de base, le nombre de paramètres de rétroaction étant inférieur au nombre de paramètres de canal. L'invention rapporte à la station de base quelques valeurs avec une grande amplitude existant dans les vecteurs ou la matrice après que la base orthonormée cible est projetée et mappée, en tant que paramètres de rétroaction, ce qui évite de rapporter tous les éléments de vecteur de caractéristiques, réduisant ainsi les ressources de porteuse occupées par la rétroaction de liaison montante et les surcharges de ressources.
PCT/CN2016/094696 2016-08-11 2016-08-11 Procédé et appareil de rapport de paramètres de rétroaction WO2018027813A1 (fr)

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