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WO2019144418A1 - 一种预编码矩阵索引上报方法、通信装置及介质 - Google Patents

一种预编码矩阵索引上报方法、通信装置及介质 Download PDF

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Publication number
WO2019144418A1
WO2019144418A1 PCT/CN2018/074496 CN2018074496W WO2019144418A1 WO 2019144418 A1 WO2019144418 A1 WO 2019144418A1 CN 2018074496 W CN2018074496 W CN 2018074496W WO 2019144418 A1 WO2019144418 A1 WO 2019144418A1
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Prior art keywords
positions
indication information
matrix
information
group
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PCT/CN2018/074496
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English (en)
French (fr)
Inventor
李雪茹
张瑞齐
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18903023.2A priority Critical patent/EP3737009A4/en
Priority to CN202210031979.3A priority patent/CN114499769A/zh
Priority to PCT/CN2018/074496 priority patent/WO2019144418A1/zh
Priority to CN201880087467.0A priority patent/CN111788785B/zh
Publication of WO2019144418A1 publication Critical patent/WO2019144418A1/zh
Priority to US16/935,549 priority patent/US10965355B2/en
Priority to US17/155,169 priority patent/US11296759B2/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478Special codebook structures directed to feedback optimisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618Space-time coding
    • H04L1/0675Space-time coding characterised by the signaling
    • H04L1/0681Space-time coding characterised by the signaling adapting space time parameters, i.e. modifying the space time matrix
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0417Feedback systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/063Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658Feedback reduction
    • H04B7/066Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658Feedback reduction
    • H04B7/0663Feedback reduction using vector or matrix manipulations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received

Definitions

  • the present application relates to the field of wireless communications technologies, and in particular, to a precoding matrix index reporting method, a communication device, and a medium.
  • Multi-input Multi-output (MIMO) technology is widely used in Long Term Evolution (LTE) systems.
  • LTE Long Term Evolution
  • SFBC space frequency block code
  • a multi-layer parallel transmission mode is used to provide a higher data transmission rate.
  • precoding technology can be used to improve the signal transmission quality or rate.
  • TDD Time Division Duplexing
  • the uplink and downlink of the radio channel are mutually different, and the downlink precoding weight vector can be estimated according to the uplink channel.
  • a pre-coding weighting matrix is generally obtained by using a terminal user feedback rank indication (RI) and a precoding matrix indication (PMI).
  • the PMI is divided into PMI1 and PMI2.
  • PMI1 indicates that the first precoding matrix W1 is a wideband parameter
  • PMI2 indicates that the second precoding matrix W2 is a subband parameter.
  • the precoding matrix (W) is a combination of two W1 and W2, namely:
  • W1 is a diagonal block matrix
  • each diagonal block matrix comprises L basis vectors (such as a two-dimensional Discrete Fourier Transform (DFT) vector), namely:
  • DFT Discrete Fourier Transform
  • L basis vectors It can also be understood as a beam vector.
  • L beam vectors Can be orthogonal to each other.
  • R is 1 and R is 2
  • the specific structures of W2 are:
  • p r,l,i represent the amplitude information of the coefficients
  • c p,l,i represent the phase information of the coefficients.
  • the broadband refers to the feedback bandwidth of the entire Channel State Indication (CSI)
  • the subband refers to a certain subband in the broadband.
  • r ⁇ ⁇ 0, 1 ⁇ represents the index of the polarization direction dimension of the antenna
  • l ⁇ ⁇ 1, .., RI ⁇ represents the sequence number of the layer
  • i ⁇ ⁇ 0, ..., L-1 ⁇ corresponds to the base vector
  • the amplitude and phase information of a coefficient are quantized according to a predefined set of quantization.
  • the quantized set of phases can be or Amplitude information can be further split into wideband amplitude And subband amplitude then Among them, the broadband amplitude is fed back over the entire bandwidth, and the sub-band amplitude is fed back for different sub-bands.
  • the quantized set of broadband amplitude and subband amplitude can be with
  • the UE notifies the base station of its selected precoding matrix by reporting PMI1 and PMI2.
  • PMI1 is used to indicate W1
  • PMI2 is used to indicate W2.
  • W1 is consistent with the entire CSI feedback bandwidth and for all RI layers, that is, W1 is a common parameter, and each subband on the entire bandwidth and a different layer of each subband, The value of W2 may be different. Therefore, PMI1 is a wideband feedback parameter and PMI2 is a subband feedback parameter. Since W2 will involve the feedback of the amplitude and phase of 2L coefficients, the feedback of PMI2 on each subband requires more bits. Further, when the number of subbands is large or the value of R is large, the total PMI2 feedback overhead will increase rapidly. Therefore, how to reduce the feedback overhead of PMI2 is a technical problem that needs to be solved at present.
  • the embodiment of the invention provides a precoding matrix index reporting method, a communication device and a medium, which can save the resource overhead occupied by the terminal reporting the precoding matrix index.
  • an embodiment of the present invention provides a precoding matrix index reporting method, which is applied to a first communication device side, where the method includes: a first communication device determines a rank indication RI and a precoding matrix indication PMI, and the PMI is used to determine R.
  • W 1 is a matrix of N rows and 2L columns
  • W 2,r is a matrix of 2L rows and F columns
  • the first row of W 2,r is obtained by DFT transformation of the first row of the matrix V 2,r , V 2 , r is a matrix of 2L rows and T columns
  • R is indicated by RI, l ⁇ 1,...,2L ⁇ .
  • the PMI includes first indication information including location index information, and location index information is used to indicate K m, r element positions of the mth row of V 2,r
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m, r elements and K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ , i ⁇ 1,...,K m,r ⁇ .
  • R is a non-negative integer
  • r are positive integers
  • K m, r is less than T
  • F is less than or equal to T.
  • the first communication device transmits the RI and the PMI.
  • an embodiment of the present invention provides a precoding matrix index reporting method, which is applied to a second communication device side, and includes: the second communication device receives a rank indication RI and a precoding matrix indication PMI.
  • W 1 is a matrix of N rows and 2L columns
  • W 2,r is a matrix of 2L rows and F columns
  • the first row of W 2,r is obtained by DFT transformation of the first row of the matrix V 2,r , V 2 , r is a matrix of 2L rows and T columns
  • R is indicated by RI, l ⁇ 1,...,2L ⁇ .
  • the PMI includes first indication information including location index information, and location index information is used to indicate K m, r element positions of the mth row of V 2,r
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m,r elements and the above K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ , i ⁇ 1,...,K m,r ⁇ .
  • RI is a non-negative integer
  • r are positive integers
  • K m, r is less than T
  • F is less than or equal to T.
  • the precoding matrix index when the precoding matrix index is reported, only the partial element position and the coefficient of the partial element position can be reported, so that the resource overhead occupied by reporting the precoding matrix index can be saved.
  • the element x belongs to the set X, and x ⁇ X indicates that the element x can take any value of the set X, but it is not necessary to traverse each value in the X.
  • m ⁇ 1, . . . , 2L ⁇ may indicate that when m takes any one of ⁇ 1, . . . , 2L ⁇ , the “PMI included in the method described in the first aspect or the second aspect is implemented.
  • the first indication information includes location index information
  • the location index information is used to indicate K m, r element locations of the mth row of V 2,r
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m,r elements and the above K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ , i ⁇ 1,...,K m,r ⁇ . "established; may also indicate that when m takes certain elements in ⁇ 1, ..., 2L ⁇ , the method described in the first aspect or the second aspect is implemented.
  • the PMI includes the first indication information and the second indication information
  • An indication information includes location index information, and the location index information is used to indicate K m, r element locations of the mth row of V 2,r
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m,r elements and the above K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ , i ⁇ 1,...,K m,r ⁇ . "All are established, and when other values are taken, the above method does not hold.
  • the PMI includes first indication information including second position information, and position indication information is used to indicate K m, r element positions of the mth line of V 2,r
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m,r elements and the above K m,r complex coefficients
  • Determining, m ⁇ ⁇ 1, ..., 2L ⁇ , i ⁇ ⁇ 1, ..., K m, r ⁇ " means that the first indication information includes position index information, and the position index information indicates V 2
  • the second indication information is used to indicate the first row to the second L row of V 2,r , and each of the other 2L-1 rows except the m 0th row is at the above element position K m, r complex coefficients
  • the position of the K m0,r element on the m 0th line and the corresponding complex coefficient can be determined by a predefined method, so there is no need to indicate by PMI.
  • V 2,r is from K m, r element positions and the above K m, r complex coefficients
  • Determined specifically refers to: V 2, r is the K m of other rows other than the m 0th row , r element positions and the above K m, r complex coefficients
  • the predefined element position and coefficient values on the m 0th line are determined.
  • the complex coefficient other than the above K m, r element positions may take a predefined value, such as 0.
  • V 2,r is from K m, r element positions and the above K m
  • r complex coefficients “Determined” specifically refers to: V 2, r is from K m, r element positions and the above K m, r complex coefficients Not determined by the 0 coefficient above the K m,r element positions.
  • the function f(x) represents the conversion of the binary sequence x to a decimal integer.
  • the PMI is used to determine R precoding matrices W 1 , . . . , W R ” and in the second aspect, “the second communication device determines R pre-preparations according to the PMI.
  • the first communication device and the second communication device may implement precoding matrices W 1 , . . . , W R under different PMI values, and then determine a precoding matrix W 1 selected by the first communication device according to the reported PMI. ..., W R .
  • the standard predefines a table that allows the first communication device and the second communication device to calculate the precoding matrices W 1 , . . . , W R according to the values of the parameters included in the PMI. Then, according to the reported PMI, the first communication device and the second communication device can calculate the precoding matrix selected by the first communication device.
  • Embodiment of the present invention embodiment when reporting V 2, the element position r m-th row of the matrix for all R V 2, the m-th row r matrix, can only reports a set of position of the K m that is reported, r The value of the element is the same for the different r.
  • the embodiment of the present invention saves the feedback overhead of the PMI in the manner that the m-th row of the r matrix is reported separately for each V 2 . .
  • location index information indicates a group of locations.
  • location index information includes This position K m elements
  • the second embodiment is achieved: the location information comprises an index window size M m M m and reference positions respectively corresponding to reference positions, each corresponding to M m based on the reference position and reference position M m
  • the window size can determine the position of the K m elements
  • This set of locations K m, r element positions for indicating the mth row of each of the R matrices V 2,1 , . . . , V 2,R means: according to the set of positions
  • the location index information includes indication information of M m reference locations, and the indication information of the M m reference locations is used to indicate the group of locations M m is a positive integer less than T.
  • the indication information of the M m reference positions is used to indicate the group of locations. " means that the set of positions can be determined based on M m reference positions
  • the reference position M m of n (n 1, ..., M m) window size associated with the reference position X m, n by the first configuration information
  • the M m reference locations and the M m window sizes are used to determine the set of locations X m,n is a positive integer.
  • the above two methods may also be the number of directions X m, n positions which decrease from the reference position along the column number of the matrix V 2,r , and will not be described again.
  • the column number decreases and increases the number of X m, n positions, respectively, then the 2X m, n +1 positions are K m Location
  • the position of the reference position is centered, and the number of columns of the matrix V 2, r decreases and increases by X m, n /2 positions respectively, and the X m, n +1 positions are K m positions
  • the position index information when the number of reference positions M m >1, the position index information includes a first reference position of the M m reference positions the absolute position information, and the reference position m m m m -1 in other positions other than the reference position of the first reference relative position information of each of the first reference position, the absolute position of a Information and the other M m -1 relative position information are used to indicate the set of positions
  • the absolute position information refers to position information relative to the value 0 within the column number range 1 to T of the matrix V 2,r .
  • the first reference position of the mth line is T 0 (the value ranges from 0 to T-1)
  • the first reference position is located at the mth line of the matrix, mod (T 0 , T +1 column; for example, if the absolute position information of the first reference position of the mth line is T 0 (value range is 1 to T), the first reference position is located at the mth line mod of the matrix ( T 0 -1, T) +1 column.
  • the relative position information indicates a relative position with respect to the above absolute position information T 0 .
  • the relative position information is ⁇ T ( ⁇ T is an integer)
  • the element position indicated by the relative position information is V 2
  • the mth line of the r is mod( ⁇ T+T 0 )+1 column ( If the value of T 0 starts from 0, or is V 2, the mth line of the r is mod( ⁇ T+T 0 -1)+1 column (if the value of T 0 starts from 1).
  • the embodiment of the present invention utilizes the time domain characteristic of the channel—the time delay of multiple sub-paths of the channel in the time domain is often concentrated. Therefore, the value range of the relative position information of the M m -1 elements is much smaller than The value range of absolute position information.
  • the number of quantization bits of the quantized position information can be reduced, thereby saving the feedback overhead of the PMI. For example, if the delay of the multipath in the time domain has a total of 64 sampling points, it means that an absolute position information of the above element needs 6 bits; when the multipath delay of the channel is relatively concentrated, for example, Within 16 sample points after an absolute position, each relative position information of the element requires 4 bits. Therefore, reporting the relative location information can reduce the feedback overhead of the PMI.
  • the location index information further includes a G m group fourth indication information, where the nth (1 ⁇ n ⁇ G m ) group fourth indication information is used.
  • the nth (1 ⁇ n ⁇ G m ) group fourth indication information is used. to an instruction from the Y m, n elements selected from the Z position of m, n elements position, wherein said the Y m, n elements is a position reference position of the G m n-th and the reference position, and
  • the window size X m,n associated with the nth reference position determines that Z m,n is a positive integer less than or equal to Y m,n , the G m reference positions, the G m window sizes, and the G m a fourth indication information for determining the set position
  • the position index information indicates an R group position, wherein the r group of the R group position is the position
  • the r group of the R group position is the position
  • the two rows may be two different rows for the R matrices.
  • the reported set of positions indicates the element positions of the n1th and m1th rows; for the matrix V 2,2 The reported set of positions indicates the element positions of the n2th and m2th lines.
  • the two rows may be the same two rows for the R matrices.
  • Embodiments of the present invention may report only one set of positions for at least two rows of each of the R matrices V 2,1 , . . . , V 2,R , as compared to each row for the matrix V 2,r The way to report a set of locations separately saves PMI's feedback overhead.
  • the 2L-1 rows may be different from the 2 L-1 rows for the R matrices, or may be the same 2L-1 rows.
  • the position of the index information indicating the position of the group R in one implementation is: R position index comprises a set of position information, the second embodiment is achieved: the location information comprises index M r M r reference positions and reference window size corresponding to the respective positions, based on the M r M r reference positions and reference positions respectively corresponding to the window size may be determined that the first set of location r R in the set of positions
  • the position of the rth group in the R group position means: the position according to the rth group of the R group positions
  • the K m,r element positions of at least two of the V 2,r may be determined.
  • the index information includes the position information indicating the position reference r M, M indicates the position reference r of group information indicating the position R R group position M r is a positive integer less than T.
  • the rm reference positions and the rm window sizes are used to determine the rth position in the R group position X r,n is a positive integer.
  • the above two methods may also be the number of directions X r and n positions which decrease along the column number of the matrix V 2,r from the reference position, and will not be described again.
  • the reference position is centered, and the number of columns of the matrix V 2,r is decreased and increased by X r and n positions respectively, and then the 2 ⁇ r, n +1 positions are K r Location
  • the position of the reference position is centered, and the number of columns of the matrix V 2,r decreases and increases by X r,n /2 positions respectively, and the X r,n +1 positions are K r positions
  • each matrix of R matrices V 2,1 , . . . , V 2,R and at least two rows in each matrix, only Reporting a set of locations saves PMI's feedback overhead compared to the way in which each of the R matrices V 2, r is reported separately.
  • each matrix of R matrices V 2,1 , . . . , V 2 ,R , and 2L-1 rows in each matrix only one is reported.
  • the group position, at this time, for the r-th matrix V 2,r the element position of the i rth row does not need to be reported by the index information, but a predefined value is adopted.
  • the row number index of the i rth row of the rth matrix may be reported by the first communication device to the second communication device.
  • the reference position when the number M r> 1 the position of the index information M r comprising a first reference position of the reference position the absolute position information, and the reference position M r than said first reference position other than the M r -1 reference positions of the respective information on the relative position of the first reference position.
  • the embodiment of the present invention utilizes the time domain characteristic of the channel—the delay of the multiple sub-paths of the channel in the time domain is often concentrated. Therefore, the value range of the relative position information of the M r -1 elements is much smaller than The value range of absolute position information. Therefore, by using the reporting method of the relative position information, the number of quantization bits of the quantized position information can be reduced, thereby saving the feedback overhead of the PMI.
  • the delay of the multipath in the time domain has a total of 64 sampling points, it means that an absolute position information of the above element needs 6 bits; when the multipath delay of the channel is relatively concentrated, for example, Within 16 sample points after an absolute position, each relative position information of the element requires 4 bits. Therefore, reporting the relative location information can reduce the feedback overhead of the PMI.
  • the absolute position information and the relative position information are referred to the foregoing explanation and will not be described again.
  • the location index information further includes a fourth indication information of the G r group, wherein the fourth indication information of the nth (1 ⁇ n ⁇ G r ) group is used. indicating selected from Z r Y r, n elements in position, the position of the n elements, wherein said Y r, n is the position of the element according to the reference G r n-th position and the reference position, and said n-th reference location associated with window size X r, n is determined, Z r, n is less than or equal Y r, n is a positive integer, G r of the reference position, the window size and G r
  • the G r fourth indication information is used to determine the rth group position in the R group position
  • the first indication information further includes
  • the second indication information further includes:
  • the coefficients are reported in a normalized manner, which can save the feedback overhead of the PMI.
  • the embodiment of the present invention normalizes the coefficients of each row only according to the maximum value of the coefficient amplitude of the row, and can avoid many of the coefficient amplitudes of some rows being much larger than the maximum of the coefficient amplitudes of other rows.
  • the coefficients of the rows are normalized and quantized to a value of 0, thereby ensuring the PMI feedback accuracy while reducing the PMI feedback overhead.
  • the coefficients are reported in a normalized manner, which can save the feedback overhead of the PMI.
  • set A is a non-empty true subset of the set ⁇ 1,...,2L ⁇ .
  • the first indication information includes indication information of the first element position ⁇ r,m of some rows of V 2,r and a second element position ⁇ r , excluding the first element position ⁇ r,m of at least one row .
  • the second indication information includes coefficient information on certain lines of V 2,r , and does not include coefficient information of at least one line.
  • the first element position ⁇ r,m of at least one line not included in the first indication information, and the coefficient information of at least one line not included in the second indication information may respectively adopt a predefined value.
  • the set A may be different for different R matrices V 2,1, . . .
  • the method further includes: the second communication device sends the second configuration information, the first communication device receives the second configuration information, and the second configuration information is used to indicate that the location index information is only included for the mth row.
  • Set of locations Set of locations It is used to indicate the K m, r element positions of the mth row of each of the R matrices V 2,1 , . . . , V 2 ,R .
  • the PMI further includes third indication information, and the third indication information is used to indicate L vectors.
  • M is a positive integer and M is greater than or equal to L.
  • the method further includes: the second communication device sends the third configuration information, the first communication device receives the third configuration information, and the third configuration information is used to indicate that the location index information includes only the R group location, where , r group position Used to indicate K m, r element positions of at least two rows in V 2,r .
  • the method further includes: wherein the relative value of the coefficient included in the second indication information is different, and the number of quantization bits having at least two relative values is different.
  • the foregoing method may be: there is m ⁇ A, n ⁇ A, and m is not equal to n, and all or part of the K m, r ⁇ 1 element positions included in the second indication information are satisfied.
  • coefficient Coefficient with the first element position ⁇ r,m The number of quantization bits of the relative value, and all or part of the coefficients of the K n, r -1 element positions included in the second indication information Coefficient with the first element position ⁇ r,n The relative value of the quantized bit number is different,
  • the foregoing method may be that all the element locations included in the second indication information Among the relative values of all or part of the coefficients other than the third element position ⁇ r and the coefficients at the ⁇ r position, the number of quantization bits having at least two relative values is different.
  • N is the number of antenna ports of the second communication device
  • L is the number of vectors included in the W 1 matrix selected by the first communication device
  • the value of L may be Configured by the second communication device or reported by the first communication device.
  • the DFT transform may be a DFT operation; or may be obtained by multiplying a DFT matrix for mathematical transformation.
  • the DFT transform may be a Fast Fourier Transform (FFT) transform.
  • FFT Fast Fourier Transform
  • the PMI includes PMI1 and PMI2, wherein the PMI2 includes the first indication information and the second indication information.
  • PMI1 includes the third indication information described above.
  • A is used to determine B and a similar expression, and there are various methods for determining, for example, pre-storing the value of B under different values of A, and therefore, according to different
  • the value of A can determine the value of the corresponding B; or the predefined calculation rule can calculate the value of the corresponding B according to the different values of A.
  • the embodiment of the present application provides a first communication device, where the first communication device includes a plurality of functional units for respectively performing the first aspect or any one of the possible implementation manners of the first aspect.
  • the precoding matrix index reporting method is provided.
  • the embodiment of the present application provides a second communication device, where the second communication device includes a plurality of functional units for respectively performing the second aspect or any one of the possible implementation manners of the second aspect.
  • the precoding matrix index reporting method is provided.
  • the embodiment of the present application provides a first communications apparatus, configured to perform the precoding matrix index reporting method described in the first aspect.
  • the first communication device can include a memory and a processor, a transmitter and a receiver coupled to the memory, wherein: the transmitter is for transmitting a signal to another communication device, such as a network device, the receiving And a signal sent by the another communication device, such as a network device, for storing an implementation code of a precoding matrix index reporting method described in the first aspect, the processor for performing the storage in the memory
  • the program code that is, the precoding matrix index reporting method described in any one of the first aspect or the possible implementation of the first aspect.
  • the processor performs the transmitting by driving or controlling the transmitter when performing a transmitting operation.
  • the processor performs the receiving by driving or controlling the receiver when performing a receiving operation.
  • the embodiment of the present application provides a second communications apparatus, configured to perform the precoding matrix index reporting method described in the second aspect.
  • the second communication device can include a memory and a processor, a transmitter and a receiver coupled to the memory, wherein: the transmitter is for transmitting a signal to another communication device, such as a terminal device, the receiving And a signal sent by the another communication device, such as a terminal device, for storing the implementation code of the precoding matrix index reporting method described in the second aspect, the processor is configured to perform the storage in the memory
  • the program code that is, the precoding matrix index reporting method described in any one of the second aspect or the possible implementation of the second aspect.
  • the processor performs the transmitting by driving or controlling the transmitter when performing a transmitting operation.
  • the processor performs the receiving by driving or controlling the receiver when performing a receiving operation.
  • the embodiment of the present application provides a communication system, where the communication system includes a first communication device and a second communication device, where the first communication device includes the first communication according to the third aspect or the fifth aspect.
  • the device, the second communication device comprising the second communication device of the above fourth aspect or sixth aspect.
  • an embodiment of the present application provides a computer readable storage medium, where the readable storage medium stores instructions, when executed on a processor, causing the processor to perform the precoding described in the first aspect above. Matrix index reporting method.
  • the embodiment of the present application provides a computer readable storage medium, where the readable storage medium stores instructions, when executed on a processor, causing the processor to perform the precoding described in the second aspect above. Matrix index reporting method.
  • the embodiment of the present application provides a computer program including instructions, when executed on a processor, causing a processor to perform the precoding matrix index reporting method described in the first aspect above.
  • an embodiment of the present application provides a computer program including instructions, when executed on a processor, causing a processor to perform the precoding matrix index reporting method described in the second aspect above.
  • the first communication device may be, but not limited to, a terminal device.
  • the second communication device may be, but not limited to, a network device.
  • the above precoding matrix index reporting method can be applied to, but not limited to, a MIMO system.
  • FIG. 1 is a schematic structural diagram of a wireless communication system according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a network device according to an embodiment of the present invention.
  • FIG. 4 is a schematic flowchart of a precoding matrix index reporting method according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of determining an element position based on a reference position and a window size according to an embodiment of the present invention
  • FIG. 6 is another schematic diagram of determining an element position based on a reference position and a window size according to an embodiment of the present invention
  • FIG. 7 is another schematic diagram of determining an element position based on a reference position and a window size according to an embodiment of the present invention.
  • FIG. 8 is another schematic diagram of determining an element position based on a reference position and a window size according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a location normalization manner reporting manner according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of another location normalization manner reporting manner according to an embodiment of the present invention.
  • FIG. 11 is a structural block diagram of a first communications apparatus according to an embodiment of the present invention.
  • FIG. 12 is a structural block diagram of a second communication apparatus according to an embodiment of the present invention.
  • FIG. 1 shows a wireless communication system according to an embodiment of the present application.
  • the wireless communication system 100 can operate in a licensed band or in an unlicensed band.
  • the wireless communication system 100 is not limited to a Long Term Evolution (LTE) system, and may be a future evolved 5G system, a New Radio (NR) system, or the like.
  • LTE Long Term Evolution
  • NR New Radio
  • the use of unlicensed frequency bands can increase the system capacity of the wireless communication system 100.
  • the wireless communication system 100 includes one or more network devices 101, one or more terminal devices 102. among them:
  • Network device 101 can communicate wirelessly with terminal device 102 via one or more antennas. Each network device 101 can provide communication coverage for each respective coverage area 104.
  • the coverage area 104 corresponding to the network device 101 can be divided into a plurality of sectors, wherein one sector corresponds to a portion of coverage (not shown).
  • the network device 101 may include: a base transceiver station (Base Transceiver Station), a wireless transceiver, a basic service set (BSS), and an extended service set (ESS).
  • BSS basic service set
  • ESS extended service set
  • Node B evolved NodeB (eNB or eNodeB), or next-generation Node B (gNB), and so on.
  • the wireless communication system 100 can include several different types of network devices 101, such as a macro base station, a micro base station, and the like.
  • the network device 101 can apply different wireless technologies, such as a cell radio access technology, or a WLAN radio access technology.
  • the terminal device 102 can be distributed throughout the wireless communication system 100, either stationary or mobile.
  • the terminal device 102 may include: a mobile device, a mobile station, a mobile unit, a wireless unit, a remote unit, a user agent, a mobile client, and the like.
  • the wireless communication system 100 can be a multi-beam communication system. among them:
  • the network device 101 can be configured with a large-scale antenna array and utilize beamforming techniques to control the antenna array to form beams of different orientations. In order to cover the entire cell 104, the network device 101 needs to use a plurality of differently directed beams.
  • the network device 101 may sequentially transmit wireless signals (Reference Signals (RSs) and/or Synchronization Signal Blocks (SS blocks)) using different directional beams. It is called Beam scanning.
  • the terminal device 102 measures the transmit beam to determine the signal quality of the transmit beam that the terminal device 102 can receive. This process is called Beam Measurement.
  • the terminal device 102 may be configured with an antenna array, or may convert different beams to transmit and receive signals. That is to say, in the wireless communication system 100, both the network device 101 and the terminal device 102 may use multiple beams for communication.
  • the wireless communication system 100 can support multi-carrier (waveform signals of different frequencies) operations.
  • a multi-carrier transmitter can simultaneously transmit modulated signals on multiple carriers.
  • each communication connection 103 can carry multi-carrier signals modulated with different wireless technologies.
  • Each modulated signal can be transmitted on different carriers, and can also carry control information (such as reference signals, control channel information, etc.), overhead information, data, and the like.
  • the network device 101 sends a Channel State Information-Reference Signal (CSI-RS) to the terminal device 102 for measuring the Channel State Information (CSI).
  • the CSI includes one or more of a Rank Index (RI), a Precoding Matrix Index (PMI), and a Channel Quality Index (CQI).
  • the terminal device 102 feeds back CSI to the network device 101, and the CSI fed back by the terminal device 102 includes one or more of PIM, RI, and CQI.
  • the PMI is used by the network device 101 to determine a precoding matrix
  • the RI is used to recommend the number of data layers that the network device 101 sends to the terminal device 102 on the same time-frequency resource
  • the CQI auxiliary network device 101 determines the modulation and coding mode to improve the transmission. Reliability and efficiency.
  • the precoding matrix determined according to the PMI may be used, or the downlink data may be precoded according to a precoding matrix determined by the PMI and other information.
  • PMI can be further divided into PMI1 and PMI2.
  • PMI1 is a common parameter.
  • the precoding matrix is the same for all layers.
  • PMI2 is a non-public parameter. Precoding matrix for each layer of data. It is different.
  • FIG. 2 shows a terminal device provided by an embodiment of the present application.
  • the terminal device 200 may include: an input and output module (including an audio input and output module 218, a key input module 216, and a display 220, etc.), a user interface 202, one or more processors 204, a transmitter 206, and a receiving device.
  • FIG. 2 is exemplified by a bus connection. among them:
  • the antenna 214 can be used to convert electromagnetic energy into electromagnetic waves in free space or to convert electromagnetic waves in free space into electromagnetic energy in a transmission line.
  • the coupler 210 is configured to divide the mobile communication signal received by the antenna 214 into multiple channels and distribute it to a plurality of receivers 208.
  • Transmitter 206 can be used to perform transmission processing on signals output by processor 204.
  • Receiver 208 can be used to perform reception processing on the mobile communication signals received by antenna 214.
  • the transmitter 206 and the receiver 208 can be regarded as a wireless modem.
  • the number of the transmitter 206 and the receiver 208 may each be one or more.
  • the terminal device 200 may also include other communication components such as a GPS module, a Bluetooth module, a Wireless Fidelity (Wi-Fi) module, and the like. Not limited to the above-described wireless communication signals, the terminal device 200 can also support other wireless communication signals such as satellite signals, short-wave signals, and the like. Not limited to wireless communication, the terminal device 200 may be configured with a wired network interface (such as a LAN interface) 201 to support wired communication.
  • a wired network interface such as a LAN interface
  • the input and output module can be used to implement interaction between the terminal device 200 and the user/external environment, and can mainly include an audio input and output module 218, a key input module 216, a display 220, and the like. Specifically, the input and output module may further include: a camera, a touch screen, a sensor, and the like. The input and output modules communicate with the processor 204 through the user interface 202.
  • Memory 212 is coupled to processor 204 for storing various software programs and/or sets of instructions.
  • memory 212 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices.
  • the memory 212 can store an operating system (hereinafter referred to as a system) such as an embedded operating system such as ANDROID, IOS, WINDOWS, or LINUX.
  • the memory 212 can also store a network communication program that can be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices.
  • the memory 212 can also store a user interface program, which can realistically display the content image of the application through a graphical operation interface, and receive user control operations on the application through input controls such as menus, dialog boxes, and keys. .
  • the memory 212 can be used to store an implementation program of the precoding matrix index reporting method provided by one or more embodiments of the present application on the terminal device 200 side.
  • the precoding matrix index reporting method provided by one or more embodiments of the present application refer to the subsequent embodiments.
  • the processor 204 can be used to read and execute computer readable instructions. Specifically, the processor 204 can be used to invoke a program stored in the memory 212, such as an implementation program of the system message receiving method provided by one or more embodiments of the present application on the terminal device 200 side, and execute the instructions included in the program to The method involved in the subsequent embodiments is implemented.
  • the processor 204 can support: Global System for Mobile Communication (GSM) (2G) communication, Wideband Code Division Multiple Access (WCDMA) (3G) communication, and Long Term Evolution (Long Term Evolution) One or more of LTE) (4G) communication, and 5G communication, and the like.
  • GSM Global System for Mobile Communication
  • WCDMA Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • 4G Long Term Evolution
  • 5G communication and the like.
  • the processor 204 transmits any message or data, it specifically performs the transmission by driving or controlling the transmitter 206.
  • processor 204 when the processor 204 receives any message or data, it specifically performs the reception by driving or controlling the receiver 208.
  • processor 204 can be viewed as a control center that performs transmission or reception, and transmitter 206 and receiver 208 are the specific executors of the transmitting and receiving operations.
  • the terminal device 200 can be the terminal device 102 in the wireless communication system 100 shown in FIG. 1, and can be implemented as a mobile device, a mobile station, a mobile unit, a wireless unit, and a remote unit.
  • User agents mobile clients, and more.
  • terminal device 200 shown in FIG. 2 is only one implementation manner of the embodiment of the present application. In an actual application, the terminal device 200 may further include more or fewer components, which are not limited herein.
  • FIG. 3 shows a network device provided by an embodiment of the present application.
  • network device 300 can include one or more processors 301, memory 302, network interface 303, transmitter 305, receiver 306, coupler 307, and antenna 308. These components can be connected via bus 304 or other means, and Figure 3 is exemplified by a bus connection. among them:
  • Network interface 303 can be used by network device 300 to communicate with other communication devices, such as other network devices.
  • the network interface 303 can be a wired interface.
  • Transmitter 305 can be used to perform transmission processing, such as signal modulation, on signals output by processor 301.
  • Receiver 306 can be used to perform reception processing on the mobile communication signals received by antenna 308. For example, signal demodulation.
  • transmitter 305 and receiver 306 can be viewed as a wireless modem. In the network device 300, the number of the transmitter 305 and the receiver 306 may each be one or more.
  • the antenna 308 can be used to convert electromagnetic energy in a transmission line into electromagnetic waves in free space, or to convert electromagnetic waves in free space into electromagnetic energy in a transmission line.
  • Coupler 307 can be used to divide the mobile pass signal into multiple channels and distribute it to multiple receivers 306.
  • Memory 302 is coupled to processor 301 for storing various software programs and/or sets of instructions.
  • memory 302 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic disk storage devices, flash memory devices, or other non-volatile solid state storage devices.
  • the memory 302 can store an operating system (hereinafter referred to as a system) such as an embedded operating system such as uCOS, VxWorks, or RTLinux.
  • the memory 302 can also store a network communication program that can be used to communicate with one or more additional devices, one or more terminal devices, one or more network devices.
  • the processor 301 can be used for performing wireless channel management, implementing call and communication link establishment and teardown, and providing cell handover control and the like for users in the control area.
  • the processor 301 may include: an Administration Module/Communication Module (AM/CM) (a center for voice exchange and information exchange), and a Basic Module (BM) (for completing a call) Processing, signaling processing, radio resource management, radio link management and circuit maintenance functions), code conversion and sub-multiplexer (TCSM) (for multiplexing demultiplexing and code conversion functions) Wait.
  • AM/CM Administration Module/Communication Module
  • BM Basic Module
  • TCSM code conversion and sub-multiplexer
  • the processor 301 can be used to read and execute computer readable instructions. Specifically, the processor 301 can be used to invoke a program stored in the memory 302, for example, the implementation of the precoding matrix index reporting method provided by one or more embodiments of the present application on the network device 300 side, and execute the program instruction.
  • the network device 300 can be the network device 101 in the wireless communication system 100 shown in FIG. 1, and can be implemented as a base transceiver station, a wireless transceiver, a basic service set (BSS), and an extended service set (ESS). , NodeB, eNodeB, gNB, etc.
  • the network device 300 shown in FIG. 3 is only one implementation of the embodiment of the present application. In an actual application, the network device 300 may further include more or fewer components, which are not limited herein.
  • first communication device described in the following embodiments may include, but is not limited to, the foregoing terminal device, and the second communication device may include, but is not limited to, the foregoing network device.
  • the embodiment of the present application provides a precoding matrix index reporting method.
  • the method includes but is not limited to the following steps:
  • the first communication device determines a rank indication RI and a precoding matrix indication PMI.
  • the first communication device includes but is not limited to: a terminal device.
  • the first communication device generates a bit sequence corresponding to the RI and the PMI.
  • W r W 1 ⁇ W 2 , r , r ⁇ 1,...,R ⁇ .
  • R denotes the number of data layers transmitted by the second communication device recommended by the first communication device to the first communication device on the same time-frequency resource.
  • R is determined by RI
  • RI is a non-negative integer
  • R is a positive integer.
  • R RI + 1.
  • W 1 is a matrix of N rows and 2L columns.
  • N is the number of ports of the second communication device
  • L is the number of beams included in the W 1 matrix
  • N and L are both positive integers.
  • N can take the values in the set ⁇ 4, 8, 12, 16, 24, 32 ⁇ .
  • M is a positive integer and M is greater than or equal to L. Therefore, the expression of the W 1 matrix can be seen in the following formula 1-2.
  • the vector in the vector set B is a discrete Fourier (DFT) vector.
  • DFT discrete Fourier
  • the PMI includes third indication information, where the third indication information is used to indicate the L vectors
  • the first communication device and the second communication device pre-store each vector in the set B and a mapping relationship between each vector and the PMI, and perform mapping according to the values of some parameters in the PMI to determine The L vectors Further determining a W 1 matrix; or, predefining a generation formula of each vector in the set B (eg, predefining a table, the table may generate a vector in the set B according to the relevant parameter), the first communication device and The second communication device calculates the L vectors according to the values of some parameters in the PMI. Further determine the W 1 matrix.
  • the second communication device sends a channel state information reference signal CSI-RS for the first communication device to measure the channel state information CSI.
  • the CSI includes one or more of RI, PMI, and CQI.
  • the PMI includes PMI1 and PMI2 for recommending a precoding matrix used by the second communication device to perform data transmission on the first communication device. Since the channel has frequency selection characteristics, the precoding matrix indicated by the PMI is different in different frequency domain granularities within the CSI feedback bandwidth.
  • the frequency domain granularity may be a Resource Block (RB), or a subband (a subband includes multiple consecutive RBs), or a Resource Block Group (RBG, one).
  • the RBG includes a plurality of consecutive RBs).
  • the precoding matrix on the f frequency domain particle size may be a downlink channel matrix of the first communication device transmitting terminal eigenvectors f H of the frequency domain on the second communication device in accordance with a particle size obtained by transforming
  • a precoding matrix at the frequency domain granularity (which may be based on a minimum mean square error criterion, a zero forcing criterion, or other criteria) is obtained from the transmit end feature vectors of the plurality of first communication devices.
  • F is determined by the number of frequency domain granularities of the CSI feedback bandwidth of the first communication device and the second communication device.
  • the first communication device In order to represent R eigenvectors on the fth RB, the first communication device first selects L beam vectors The above W 1 matrix is constructed.
  • the L beam vectors may be orthogonal beam vectors or non-orthogonal beam vectors. Therefore, PMI1 is used to indicate the L beam vectors selected by the first communication device.
  • the selection of the L beams is consistent for all frequency domain granularities within the CSI feedback bandwidth and is also consistent for all RI eigenvectors.
  • the rth column is the rth eigenvector of R f , Matrix
  • the coefficients in the j+1th row of the rth column are complex numbers including amplitude and phase.
  • each column selects and reports a frequency domain reference position i r (the reporting of i r can be placed in PMI1 or in PMI2), and the other 2L-1 coefficients of the column are referenced by the coefficient.
  • the coefficients are normalized to the benchmark: Get the normalized W 2,f matrix:
  • the above-mentioned frequency domain coefficient reference position of each column may be a line number of the coefficient of the column with the largest wideband amplitude.
  • the wideband amplitude of a coefficient can be obtained by counting the magnitude of the coefficient over all F frequency domain granularities, performing an average calculation or a squared average calculation or other operational statistics.
  • the frequency domain coefficient reference position of each column may also be a coefficient position where the column is fixed to a certain row (such as the first row). The inventive solution does not limit the selection method of the above-mentioned frequency domain coefficient reference position.
  • the first communication device is targeted Each of the columns does not perform the above normalization operation, directly obtaining the W 2,f matrix, ie How to There are other schemes for obtaining W 2,f , and the scheme of the invention is not limited.
  • the values of the elements in all F frequency domain granularities are concatenated to form a vector [w j,r,1 ,...,w j,r,F ], thereby forming W 2,r as shown in the following formula 1-4a.
  • the precoding matrix of all layers on the frequency domain granularity can also be obtained by spelling the precoding vector W r (f) of each layer of data: [W 1 (f),... , W R (f)].
  • the first communication device After determining the vector [w j,r,1 ,...,w j,r,F ], the first communication device performs an IDFT (or inverse fast Fourier transform, IFFT) operation on the vector to obtain a corresponding time domain signal.
  • Vector [a r,j,1 ,..., a r,j,T ] (T is the smallest power of 2 greater than or equal to F, F is a positive integer) and acts as a V 2,r matrix
  • the j+1th row, thereby obtaining the time domain V 2 corresponding to the rth column of the W 2,f matrix , the r matrix is as shown in the following formula 1-5:
  • V 2,r is a matrix of 2L rows and T columns.
  • the first row of V 2,r is DFT transformed to obtain the first row of the above W 2,r , l ⁇ 1,...,2L ⁇ .
  • the DFT transform may be a DFT operation; or may be obtained by mathematically transforming by multiplying the DFT matrix.
  • the DFT transform may also be an FFT transform.
  • the PMI includes first indication information including location index information, and location index information is used to indicate K m, r element positions of the mth row of V 2,r
  • the element position can be understood as a time domain tap position, and the coefficients at these element positions are non-zero or greater than or equal to a predetermined value.
  • the elements on the mth line of V 2,r that are not at these element positions take a predefined value (such as 0).
  • the number of positions of the above elements K m,r may be a predefined value, or the second communication device is configured for the first communication device or is reported by the first communication device. Where K m,r is a positive integer and K m,r is less than T.
  • the location index information indicates a group of locations
  • the element position of the mth row of the V 2,r matrix is reported, for all the R V 2, the mth row of the r matrix, only one set of positions can be reported, that is, the above reported K m, r
  • the value of the element position is the same for different r.
  • the mth line of the r matrix reports a set of positions separately, the feedback overhead of the PMI is saved.
  • the positions of the channel time domain multipaths corresponding to the same beam ie, the same row of the R matrices
  • the performance loss is small, but can greatly reduce the feedback overhead of PMI.
  • the location index information includes the M m reference locations.
  • Indication information the M m reference locations
  • the indication information is used to indicate the set of locations M m is a positive integer less than T.
  • the M m reference locations and the M m window sizes are used to determine the set of locations X m,n is a positive integer.
  • the M m window sizes may be configured by the second communication device to the first communication device through the configuration information.
  • the above two methods may also be the number of directions X m, n positions which decrease from the reference position along the column number of the matrix V 2,r , and will not be described again.
  • the column number decreases and increases the number of X m, n positions, respectively, then 2X m, n + 1 position is K m positions
  • the reference position is centered, and the column numbers of the matrix V 2, r are respectively decreased and increased by X m, n /2 positions, respectively, and then X m, n +1 positions are K m positions
  • the absolute position of the index information includes position information of the reference position M m a first reference position and the reference position M m Relative position information of each of the other M m -1 reference positions except the first reference position with respect to the first reference position.
  • the embodiment of the present invention utilizes the time domain characteristic of the channel—the time delay of multiple sub-paths of the channel in the time domain is often concentrated. Therefore, the value range of the relative position information of the M m -1 elements is much smaller than The value range of absolute position information. Therefore, by using the reporting method of the relative position information, the number of quantization bits of the quantized position information can be reduced, thereby saving the feedback overhead of the PMI.
  • the delay of the multipath in the time domain has a total of 64 sampling points, it means that an absolute position information of the above element needs 6 bits; when the multipath delay of the channel is relatively concentrated, for example, Within 16 sample points after an absolute position, each relative position information of the element requires 4 bits. Therefore, reporting the relative location information can reduce the feedback overhead of the PMI.
  • the position of the index information further includes fourth information indicating the group G m, wherein the first n (1 ⁇ n ⁇ G m) indicating information indicates the fourth group, n-positions selected from the elements of Y m Z m, n element positions, wherein the Y m, n element positions are based on an nth reference position of the G m reference positions and a window size X associated with the nth reference position Determined by m,n , Z m,n is a positive integer less than or equal to Y m,n , the G m reference positions, the G m window sizes, and the G m fourth indication information are used to determine Set of locations In this case, not all element positions in the domain window are selected as K m, r element positions. When you need to additionally report the actual selected K m, r element positions
  • the location index information indicates an R group location, where the rth group is in the location
  • the two rows of the at least two rows of each of the foregoing matrices may be two different rows for the R matrices.
  • the reported set of positions indicates the nth and m1 rows.
  • the position of the element; for the matrix V 2 , 2 the reported set of positions indicates the element positions of the n2th and m2th lines.
  • the two rows may be the same two rows for the R matrices.
  • Embodiments of the present invention may report only one set of positions for at least two rows of each of the R matrices V 2,1 , . . .
  • V 2,R V 2,R , as compared to each row for the matrix V 2,r
  • the way to report a set of locations separately saves PMI's feedback overhead.
  • the 2L-1 rows may be different from the 2 L-1 rows for the R matrices, or may be the same 2L-1 rows.
  • the position of the index information comprises reference position M r Indication information, the MR reference locations
  • the indication information is used to indicate the r-th group position in the R group position M r is a positive integer less than T.
  • the rm window sizes may be configured by the second communication device to the first communication device through the configuration information.
  • the above two methods may also be the number of directions X r and n positions which decrease along the column number of the matrix V 2,r from the reference position, and will not be described again.
  • the reference position is centered, and the number of columns of the matrix V 2,r is decreased and increased by X r and n positions respectively, and then the 2 ⁇ r, n +1 positions are K r Location
  • the position of the reference position is centered, and the number of columns of the matrix V 2,r decreases and increases by X r,n /2 positions respectively, and the X r,n +1 positions are K r positions
  • the value of the window size X m,n or X r,n may be predefined, or configured by the second communication device, or reported by the first communication device.
  • the window size is used to represent the length of the time domain window formed by the positions of the plurality of elements.
  • the absolute position of the index information includes position information of the M r of the first reference position, a reference position, and the M r than said reference position, M r other than the first reference position -1 with respect to the reference position of each relative position information of the first reference position.
  • the absolute position information and the relative position information please refer to the foregoing invention content, and details are not described herein again.
  • the embodiment of the present invention utilizes the time domain characteristic of the channel—the delay of the multiple sub-paths of the channel in the time domain is often concentrated. Therefore, the value range of the relative position information of the M r -1 elements is much smaller than The value range of absolute position information.
  • the number of quantization bits of the quantized position information can be reduced, thereby saving the feedback overhead of the PMI. For example, if the delay of the multipath in the time domain has a total of 64 sampling points, it means that an absolute position information of the above element needs 6 bits; when the multipath delay of the channel is relatively concentrated, for example, Within 16 sample points after an absolute position, each relative position information of the element requires 4 bits. Therefore, reporting the relative location information can reduce the feedback overhead of the PMI.
  • the location index information further includes a fourth indication information of the G r group, wherein the fourth indication information of the nth (1 ⁇ n ⁇ G r ) group is used. indicating selected from Z r Y r, n elements in position, the position of the n elements, wherein said Y r, n is the position of the element according to the reference G r n-th position and the reference position, and said n-th reference location associated with window size X r, n is determined, Z r, n is less than or equal Y r, n is a positive integer, G r of the reference position, the window size and G r
  • the G r fourth indication information is used to determine the rth group position in the R group position In this case, not all element positions in the domain window are selected as K m, r element positions. When you need to additionally report the actual selected K m, r element positions
  • M m> 1 or M r> 1, or M r M m reporting reference positions include but are not limited to, the following two ways.
  • the first type of reporting is that the reporting of the M m or the rm reference positions is performed by means of an independent reporting, that is, each reference position reports an absolute value of 1 to T (or 0 to T-1).
  • the number of quantization bits per absolute value is Bit.
  • the second reporting method is that the reporting of the M m or the rm reference positions can be performed by relative position reporting, that is, the reference position of one of the M m or rm reference positions (or one of the predefined positions) is an absolute value.
  • the remaining M m -1 or M rr -1 reference positions report relative position information relative to the reference position of one (or a predefined position).
  • the absolute number of quantization bits is Bit
  • the number of quantization bits of the relative position is Bit
  • the advantage of the second reporting method is that when the positions of the respective time domain windows are very close, the number of bits required for reporting the relative position information is smaller than the number of bits required for reporting the absolute position information, which can reduce the reporting overhead.
  • the relative position information may be a relative value calculated by using a difference, a quotient, or the like.
  • the second indication information is used to indicate the position of the element in the mth row of V 2,r K m, r complex coefficients V 2,r is the position of K m,r elements and the above K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ , i ⁇ 1,...,K m,r ⁇ .
  • the second indication information includes K m, r element positions All or part of the coefficients of the K m,r -1 element positions other than the first element position ⁇ r,m Coefficient with the position of the first element ⁇ r,m
  • the relative value where the relative value can be the quantized value of the difference or quotient, for example: Quantitative value, or Quantitative value, or Quantitative value, or Quantitative value.
  • the second indication information further includes
  • the relative value can be a difference or a quotient, for example: Quantitative value, or Quantitative value, or Quantitative value, or Quantitative value.
  • the first indication information includes a third element of V 2,r
  • the first indication information indicates the corresponding element position for the 2L-1 line, and indicates the K m, r element positions corresponding to the mth line.
  • the position of the element with the largest coefficient coefficient ⁇ r,m (position 1, position 2, position 3 in the figure).
  • the second indication information indicates the line Normalized values of all or part of the coefficients at positions other than ⁇ r,m relative to the coefficients at positions ⁇ r,m
  • the quantized value shown by the dotted line in the figure).
  • the first indication information further indicates a position ⁇ r (position 4 in the figure) corresponding to the largest coefficient width in 2L-1 ⁇ r,m
  • the second indication information also indicates 2L-2 ⁇ except ⁇ r Normalized value of the coefficient at the r,m position relative to the coefficient of the ⁇ r position
  • the quantized value (shown by the solid line in the figure).
  • the advantage of this method is that if the amplitude of the coefficients on one line of the V 2,r matrix is relatively smaller than the coefficient of the other line, the normalization method can still make the coefficients of the ⁇ not fully normalized and quantized. A value of 0 can improve the feedback accuracy of the PMI.
  • the first indication information indicates the corresponding element position for the 2L-1 line, and indicates all 2L-1 lines.
  • K m, r element positions The position of the element with the largest coefficient coefficient ⁇ r (position 5 in the figure), and the position of K m, r elements of all rows Coefficient of all or part of the non- ⁇ r with respect to the position of a normalized value of the quantized value of the coefficient ⁇ r position (solid line).
  • the number of quantization bits having at least two relative values is different.
  • the relative values are sorted according to the magnitude of the relative value, and the P coefficient relative values having the largest amplitude value adopt more quantization bits than the other coefficient relative values.
  • the comparison of the number of quantization bits may be the number of amplitude quantization bits and the number of phase quantization bits.
  • the coefficients of the reported K m,r -1 element positions are relatively
  • the number of quantized bits of the value is larger than the number of quantized bits of the relative value of the coefficient at the position of K n, r -1 elements.
  • the comparison of the number of quantization bits may be the number of amplitude quantization bits and the number of phase quantization bits.
  • the first communication device may sort according to the magnitude of the relative value, and the P coefficient relative values having the largest amplitude value adopt more quantization bits than the other coefficient relative values.
  • the comparison of the number of quantization bits here may be the number of amplitude quantization bits and the number of phase quantization bits.
  • the first communication device sends a rank indication RI and a precoding matrix indication PMI.
  • the first communication device includes but is not limited to: a network device.
  • the second communication device restores the time domain matrix V 2,r of each layer according to the RI and PMI reported by the first communication device.
  • the second communication device determines R based on the RI.
  • the second communication device performs DFT conversion on V 2,r to obtain a frequency domain V2 matrix W 2,r on each sub-band or RB.
  • Combining L vectors reported by the first communication device Get the W1 matrix.
  • the precoding matrix on the fth RB/subband is determined.
  • the downlink data is precoded by using a precoding matrix when transmitting the downlink data.
  • the method further includes: the second communications device sends the second configuration information, the first communications device receives the second configuration information, where the second configuration information is used to indicate that the location index information includes only one set of locations for the mth row Set of locations Used to indicate the same K m, r element positions of the mth row of each of the R matrices V 2,1 , . . . , V 2,R . Or a set of locations
  • the same K m, r element positions used to indicate the mth row of each of the R matrices V 2,1 , . . . , V 2,R may also be protocol-defined.
  • the method further includes: the second communications device sends the third configuration information, the first communications device receives the third configuration information, and the third configuration information is used to indicate that the location index information includes only the R group location, where the r group position Used to indicate the same K m, r element positions of at least two of V 2,r .
  • the r group position The same K m, r element locations used to indicate at least two of V 2,r may also be protocol-defined.
  • the precoding matrix index when the precoding matrix index is reported, only the partial element position and the coefficient amplitude and the coefficient phase of the partial element position can be reported, which can save the feedback overhead of the PMI.
  • multiple element locations When multiple element locations are reported, they can be reported in the location normalization mode, which further saves the PMI feedback overhead.
  • the coefficient amplitude and the coefficient phase are reported, the normalized manner can be reported, which further saves the feedback overhead of the PMI.
  • FIG. 11 is a structural block diagram of a first communication apparatus provided by the present application.
  • the first communication device 110 may include a determining unit 1101 and a transmitting unit 1102.
  • the determining unit 1101 is configured to determine a rank indication RI and a precoding matrix indication PMI, where the PMI is used to determine R precoding matrices W 1 , . . . , W R , where the rth of the R precoding matrices
  • the W 1 is a matrix of N rows and 2L columns
  • the W 2,r is a matrix of 2L rows and F columns
  • the 1st row of the W 2,r is DFT transformed by the 1st row of the matrix V 2,r
  • the V 2,r is a matrix of 2L rows and T columns, and the R is indicated by the RI, l ⁇ 1, . . . , 2L ⁇ ;
  • the PMI includes first indication information and second indication information, where the first indication information includes location index information, where the location index information is used to indicate K m, r elements of the mth row of the V 2,r position
  • the second indication information is used to indicate the position of the element in the mth row of the V 2,r K m, r complex coefficients
  • the V 2,r is from the K m, r element positions and the K m, r complex coefficients Determined, m ⁇ 1,...,2L ⁇ ,i ⁇ 1,...,K m,r ⁇ ;
  • the RI is a non-negative integer
  • the N, L, F, T, and K m, r are positive integers, K m, r is less than T, and F is less than or equal to T;
  • the sending unit 1102 is configured to send the RI and the PMI.
  • the location index information indicates a group of locations
  • the location index information indicates an R group location, where the rth group in the R group location is the location
  • the position of the index information includes information indicating reference positions M m, M m indication information for indicating a reference position of the set of locations M m is a positive integer less than T.
  • the position of the index information includes information indicating a reference position M r, M r indicating the reference position information for indicating the position of the group R r group in position M r is a positive integer less than T.
  • the M m window sizes are used to determine the set of locations X m,n is a positive integer.
  • the rm window sizes are used to determine the rth position in the R group position X r,n is a positive integer.
  • the location index information further includes a G m group fourth indication information, where the nth (1 ⁇ n ⁇ G m ) group fourth indication information is used to indicate the Y m, Z m selected from n element positions , n element positions, wherein the Y m, n element positions are based on the nth reference position of the G m reference positions and the nth
  • the reference window associated with the reference position X m,n determines that Z m,n is a positive integer less than or equal to Y m,n , the G m reference positions, the G m window sizes, and the G m fourth indication information for determining the set of positions
  • the position of the index information further comprises a fourth group G r indication information, wherein the first n (1 ⁇ n ⁇ G r) indicating information indicates the fourth group from Y r, n Z r, n element positions selected among the element positions, wherein the Y r, n element positions are based on the nth reference position among the G r reference positions and related to the nth reference position window size associated X r, n is determined, Z r, n is less than or equal Y r, n is a positive integer, G r of the reference position, the window size and G r G r a fourth of the The indication information is used to determine the r-th group position in the R group position
  • the first indication information further includes indication information of
  • the second indication information includes the K m, r element positions All or part of the coefficients of the K m, r -1 element positions other than the first element position ⁇ r,m Coefficient with the first element position ⁇ r,m Relative value,
  • the second indication information further includes:
  • the number of quantization bits having at least two relative values is different.
  • the PMI further includes third indication information, the third indication information is used to indicate the L vectors M is a positive integer and M is greater than or equal to L.
  • FIG. 12 is a structural block diagram of a second communication apparatus provided by the present application.
  • the second communication device 120 may include a receiving unit 1201 and a determining unit 1202.
  • the receiving unit 1201 is configured to receive a rank indication RI and a precoding matrix indication PMI;
  • the W 1 is a matrix of N rows and 2L columns
  • the W 2,r is a matrix of 2L rows and F columns
  • the 1st row of the W 2,r is DFT transformed by the 1st row of the matrix V 2,r
  • the V 2, r is a matrix of 2L rows and T columns, and the R is indicated by the RI, l ⁇ 1, . . . , 2L ⁇ ;
  • the PMI includes first indication information and second indication information, where the first indication information includes location index information, where the location index information is used to indicate K m, r elements of the mth row of the V 2,r position
  • the second indication information is used to indicate the position of the element in the mth row of the V 2,r K m, r complex coefficients
  • the V 2,r is the K m,r element positions and the above K m,r complex coefficients Determined, m ⁇ 1,...,2L ⁇ ,i ⁇ 1,...,K m,r ⁇ ;
  • the RI is a non-negative integer
  • the N, L, F, T, R, and K m, r are all positive integers
  • K m, r is less than T
  • F is less than or equal to T.
  • the location index information indicates a group of locations
  • the location index information indicates an R group location, where the rth group in the R group location is the location
  • the position of the index information includes information indicating reference positions M m, M m indication information for indicating a reference position of the set of locations M m is a positive integer less than T.
  • the position of the index information includes information indicating a reference position M r, M r indicating the reference position information for indicating the position of the group R r group in position M r is a positive integer less than T.
  • the M m window sizes are used to determine the set of locations X m,n is a positive integer.
  • the rm window sizes are used to determine the rth position in the R group position X r,n is a positive integer.
  • the location index information further includes a G m group fourth indication information, where the nth (1 ⁇ n ⁇ G m ) group fourth indication information is used to indicate the Y m, Z m selected from n element positions , n element positions, wherein the Y m, n element positions are based on the nth reference position of the G m reference positions and the nth
  • the reference window associated with the reference position X m,n determines that Z m,n is a positive integer less than or equal to Y m,n , the G m reference positions, the G m window sizes, and the G m fourth indication information for determining the set of positions
  • the position of the index information further comprises a fourth group G r indication information, wherein the first n (1 ⁇ n ⁇ G r) indicating information indicates the fourth group from Y r, n Z r, n element positions selected among the element positions, wherein the Y r, n element positions are based on the nth reference position among the G r reference positions and related to the nth reference position window size associated X r, n is determined, Z r, n is less than or equal Y r, n is a positive integer, G r of the reference position, the window size and G r G r a fourth of the The indication information is used to determine the r-th group position in the R group position
  • the first indication information further includes indication information of
  • the second indication information includes the K m, r element positions All or part of the coefficients of the K m, r -1 element positions other than the first element position ⁇ r,m Coefficient with the first element position ⁇ r,m Relative value,
  • the second indication information further includes:
  • the first indication information includes a third element position ⁇ r of the V 2, r , where the ⁇ r is used to indicate an element position Upper, coefficient amplitude The largest element position;
  • the second indication information includes all of the element locations The relative value of all or part of the coefficients at other element positions and the coefficients at the ⁇ r position except for the third element position ⁇ r , To pass the set corresponding to all elements m belonging to set A Take the union of the resulting collection.
  • the number of quantization bits having at least two relative values is different.
  • the PMI further includes third indication information, the third indication information is used to indicate the L vectors M is a positive integer and M is greater than or equal to L.
  • the steps of the method or algorithm described in connection with the disclosure of the embodiments of the present invention may be implemented in a hardware manner, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in RAM, flash memory, ROM, Erasable Programmable ROM (EPROM), and electrically erasable programmable read only memory (Electrically EPROM).
  • EEPROM electrically erasable programmable read only memory
  • registers hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a transceiver or relay device.
  • the processor and the storage medium may also exist as discrete components in a network device or a
  • the functions described in the embodiments of the present invention may be implemented in hardware, software, firmware, or any combination thereof.
  • the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

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Abstract

本申请公开了一种预编码矩阵索引上报方法、通信装置及介质,其中,该方法包括:第一通信装置确定RI和PMI,PMI用于确定R个预编码矩阵W 1,…,W R,R个预编码矩阵中的第r个预编码矩阵W r满足Wr=W1×W2,r;W2,r的第l行是由矩阵V2,r的第l行做DFT变换得到的,R是由RI指示的;PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V2,r的第m行的Km,r个元素位置aa,第二指示信息用于指示V2,r的第m行中在元素位置 bb上的Km,r个复系数 cc,V2,r由K m,r个元素位置和Km,r个复系数 cc确定;第一通信装置发送RI和PMI。实施本申请可以节省PMI的反馈开销。

Description

一种预编码矩阵索引上报方法、通信装置及介质 技术领域
本申请涉及无线通信技术领域,尤其涉及一种预编码矩阵索引上报方法、通信装置及介质。
背景技术
长期演进(Long Term Evolution,LTE)系统中广泛采用了多输入多输出(Multi-input Multi-output,MIMO)技术。对于小区边缘用户,采用空频块码(SFBC)传输模式来提高小区边缘信噪比。对于小区中心用户,采用多层并行传输的传输模式来提供较高的数据传输速率。如果基站端可以获得全部或者部分下行信道信息的时候,可以采用预编码(Precoding)技术来提高信号传输质量或者速率。对于TDD(Time Division Duplexing)系统,无线信道的上下行具有互异性,可以根据上行信道来估计出下行的预编码加权矢量。但是对于FDD(Time Division Duplexing)系统,由于上行和下行的载波频率不同,因此不能利用上行信道来获得下行的预编码加权矢量。在LTE系统中,一般采用终端用户反馈秩指示(RI)和预编码矩阵指示(PMI)的方式来获得预编码加权矩阵。
为了达到提高PMI的反馈精度和降低PMI的反馈开销的折中,在LTE系统和下一代无线通信系统中,PMI分为PMI1和PMI2。其中,PMI1指示第一预编码矩阵W1,是宽带参数;PMI2指示第二预编码矩阵W2,是子带参数。在此反馈机制下,预编码矩阵(W)由两个W1和W2合并而成,即:
W=W 1×W 2     (公式1)
其中,W1为对角块矩阵,且每个对角块矩阵包含L个基向量(如二维离散傅里叶变换(Discrete Fourier Transform,DFT)向量),即:
Figure PCTCN2018074496-appb-000001
其中,
Figure PCTCN2018074496-appb-000002
即为上述L个基向量,
Figure PCTCN2018074496-appb-000003
也可理解为波束向量。L个波束向量
Figure PCTCN2018074496-appb-000004
可以相互正交。
某个子带上的W2矩阵是2L*R的矩阵,R是由RI指示的,例如,R=RI+1。在R为1和R为2的时候,W2的具体结构分别为:
Figure PCTCN2018074496-appb-000005
Figure PCTCN2018074496-appb-000006
其中,p r,l,i表示系数的幅度信息,c p,l,i表示系数的相位信息。这里,宽带指的是整个信道状态信息(Channel State Indication,CSI)的反馈带宽,子带指的是宽带中的某个子带。其中,r∈{0,1}表示天线的极化方向维度的索引,l∈{1,..,RI}表示层的序号,i∈{0,...,L-1}对应基向量
Figure PCTCN2018074496-appb-000007
一般来说,系数的幅度信息和相位信息都会根据预定义的量化集合进行量化。例如,相位的量化集合可以是
Figure PCTCN2018074496-appb-000008
或者
Figure PCTCN2018074496-appb-000009
幅度信息可以进一步拆分为宽带幅度
Figure PCTCN2018074496-appb-000010
和子带幅度
Figure PCTCN2018074496-appb-000011
Figure PCTCN2018074496-appb-000012
其中,宽带幅度在整个带宽上反馈一份,子带幅度针对不同的子带都进行反馈。宽带幅度和子带幅度的量化集合可以分别是
Figure PCTCN2018074496-appb-000013
Figure PCTCN2018074496-appb-000014
现有技术中,UE通过上报PMI1和PMI2的方式来通知基站其所选择的预编码矩阵。其中PMI1用于指示W1,PMI2用于指示W2。为了降低反馈开销,一般认为W1在整个CSI反馈带宽上和针对所有RI层都保持一致,也即是说,W1为公共参数,而整个带宽上的每个子带以及每个子带的不同的层,其W2的取值都可能不同。因此,PMI1是宽带反馈参数,PMI2是子带反馈参数。由于W2会涉及2L个系数的幅度和相位的反馈,因此,每个子带上PMI2的反馈需要较多的比特个数。进一步,当子带个数较多或R取值较大时,总的PMI2反馈开销将迅速上升。因此,如何降低PMI2的反馈开销是目前需要解决的技术问题。
发明内容
本发明实施例提供了一种预编码矩阵索引上报方法、通信装置及介质,能够节省终端上报预编码矩阵索引所占用的资源开销。
本发明实施例具体可以通过如下技术方案实现:
第一方面,本发明实施例提供一种预编码矩阵索引上报方法,应用于第一通信装置侧,该方法包括:第一通信装置确定秩指示RI和预编码矩阵指示PMI,PMI用于确定R个预编码矩阵W 1,…,W R,其中,R个预编码矩阵中的第r个预编码矩阵W r满足W r=W 1×W 2,r,r∈{1,...,R}。W 1是N行2L列的矩阵,W 2,r是2L行F列的矩阵,W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,V 2,r是2L行T列的矩阵,R是由RI指示的,l∈{1,...,2L}。PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息 用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000015
第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000016
上的K m,r个复系数
Figure PCTCN2018074496-appb-000017
V 2,r是由K m,r个元素位置和K m,r个复系数
Figure PCTCN2018074496-appb-000018
确定的,m∈{1,...,2L},i∈{1,...,K m,r}。其中,R为非负整数,N、L、F、T和K m,r均为正整数,K m,r小于T,F小于等于T。第一通信装置发送RI和PMI。
第二方面,本发明实施例提供一种预编码矩阵索引上报方法,应用于第二通信装置侧,该方法包括:第二通信装置接收秩指示RI和预编码矩阵指示PMI。第二通信装置根据PMI确定R个预编码矩阵W 1,…,W R,其中,R个预编码矩阵中的第r个预编码矩阵W r满足W r=W 1×W 2,r,r∈{1,...,R}。W 1是N行2L列的矩阵,W 2,r是2L行F列的矩阵,W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,V 2,r是2L行T列的矩阵,R是由RI指示的,l∈{1,...,2L}。PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000019
第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000020
上的K m,r个复系数
Figure PCTCN2018074496-appb-000021
V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000022
确定的,m∈{1,...,2L},i∈{1,...,K m,r}。其中,RI为非负整数,N、L、F、T、R和K m,r均为正整数,K m,r小于T,F小于等于T。
实施第一方面或第二方面描述的方法,在进行预编码矩阵索引上报时,可以只上报部分元素位置以及该部分元素位置上的系数,因此,可以节省上报预编码矩阵索引所占用的资源开销。
可选的,在本发明实施例中,元素x属于集合X,x∈X表示元素x可以取集合X中的任何一个取值,但无需遍历X中的每一个取值。例如,上述m∈{1,...,2L}可以表示m取{1,...,2L}中的任何一个元素时,实施第一方面或第二方面描述的方法中的“PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000023
第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000024
上的K m,r个复系数
Figure PCTCN2018074496-appb-000025
V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000026
确定的,m∈{1,...,2L},i∈{1,...,K m,r}。”成立;也可以表示,m取{1,...,2L}中的某些元素时,实施第一方面或第二方面描述的方法“PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000027
第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000028
上的K m,r个复系数
Figure PCTCN2018074496-appb-000029
V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000030
确定的,m∈{1,...,2L},i∈{1,...,K m,r}。”都成立,而取其它值时,上述方法不成立。
一个具体的例子,“PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000031
第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000032
上的K m,r个复系数
Figure PCTCN2018074496-appb-000033
V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000034
确定的,m∈{1,...,2L},i∈{1,...,K m,r}”表示的是:第一指示信息包括位置索引信息,位置索引信息指示V 2,r的第一行至第2L行中,除了第m 0行之外的其它2L-1行中每一行的K m,r个元素位置
Figure PCTCN2018074496-appb-000035
(m代表行号),第二指示信息用于指示V 2,r的第一行至第2L行中,除了第m 0行之外的其它2L-1行中每一行在上述元素位置
Figure PCTCN2018074496-appb-000036
上的K m,r个复系数
Figure PCTCN2018074496-appb-000037
(m代表行号)。此时,第m 0行上的K m0,r元素位置和相应的复系数可以通过预定义的方法确定,因此无需通过PMI 进行指示了。此时,“V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000038
确定的”具体指的是:V 2,r是由非第m 0行的其它行的K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000039
以及第m 0行上的预定义的元素位置和系数取值确定的。
可选的,对于V 2,r的第m行,非上述K m,r个元素位置上的复系数,可以取预定义的值,如0。则,“V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000040
确定的”具体指的是:V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000041
非上述K m,r个元素位置上的0系数确定的。
可选的,R由RI指示的规则可以是根据预定义的规则确定的。例如,当RI的取值为从00开始的二进制数时,R=f(RI)+1,如表1。或者,当RI的取值为从01开始的二进制数时,R=f(RI),如表2。函数f(x)表示将二进制序列x转换为十进制整数。
表格1
RI R
00 1
01 2
10 3
表格2
RI R
01 1
10 2
再例如,当RI的取值为从0开始的整数时,R=RI+1,如表3。或者,当RI的取值为从1开始的整数时,R=RI,如表4。
表格3
RI R
0 1
1 2
2 3
表格4
RI R
1 1
2 2
可选的,实施第一方面中“所述PMI用于确定R个预编码矩阵W 1,…,W R”和实施第 二方面中“所述第二通信装置根据所述PMI确定R个预编码矩阵W 1,…,W R”所涉及的根据PMI确定预编码矩阵的方法可以有多种。例如,第一通信装置和第二通信装置可以实现存储不同PMI取值下的预编码矩阵W 1,…,W R,然后根据上报的PMI来确定第一通信装置选择的预编码矩阵W 1,…,W R。或者,标准预定义一个表格,该表格可以使第一通信装置和第二通信装置根据PMI中所包含的各参数的取值计算得到预编码矩阵W 1,…,W R。则根据上报的PMI,第一通信装置和第二通信装置即可计算第一通信装置选择的预编码矩阵。
结合第一方面或第二方面,在一种可能的设计中,RI≥2,针对第m行,位置索引信息指示一组位置
Figure PCTCN2018074496-appb-000042
该一组位置
Figure PCTCN2018074496-appb-000043
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。实施本发明实施例,当上报V 2,r矩阵第m行的元素位置时,对于所有R个V 2,r矩阵的第m行,可以只上报一组位置,即上报的上述K m,r个元素位置针对不同的r的取值是相同的,相较于针对每个V 2,r矩阵的第m行都单独上报一组位置的方式来说,本发明实施例节省了PMI的反馈开销。
需要说明的是,“位置索引信息指示一组位置
Figure PCTCN2018074496-appb-000044
”的一种实现方式是:位置索引信息包括
Figure PCTCN2018074496-appb-000045
这K m个元素位置,第二种实现方式是:位置索引信息包括M m个参考位置和M m个参考位置各自对应的窗口尺寸,根据该M m个参考位置和M m个参考位置各自对应的窗口尺寸可以确定出这K m个元素位置
Figure PCTCN2018074496-appb-000046
“该一组位置
Figure PCTCN2018074496-appb-000047
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的K m,r个元素位置”是指:根据该一组位置
Figure PCTCN2018074496-appb-000048
可以确定出所述K m,r个元素位置
Figure PCTCN2018074496-appb-000049
即t r,m,i=c m,i
需要说明的是,上述K m,r个元素位置
Figure PCTCN2018074496-appb-000050
并非实际上报的PMI的参数,而是基于该一组位置
Figure PCTCN2018074496-appb-000051
确定出的。
结合第一方面或第二方面,在一种可能的设计中,上述位置索引信息包括M m个参考位置的指示信息,所述M m个参考位置的指示信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000052
M m为小于T的正整数。
需要说明的是,“所述M m个参考位置的指示信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000053
”是指:根据M m个参考位置可以确定出所述一组位置
Figure PCTCN2018074496-appb-000054
结合第一方面或第二方面,在一种可能的设计中,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000055
X m,n为正整数;或者,与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000056
X m,n为正整数。
根据M m个窗口尺寸X m,n和M m个参考位置确定上述K m个位置
Figure PCTCN2018074496-appb-000057
的方法有多种。以M m=1为例。可选的,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X m,n个位置,这X m,n个位置包括于K m个位置
Figure PCTCN2018074496-appb-000058
中,此时,1+X m,n=K m。可选的,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X m,n-1个位置,这X m,n个位置为K m个位置
Figure PCTCN2018074496-appb-000059
此时,X m,n=K m。上述两种方法,也可以是从参考 位置开始沿矩阵V 2,r的列号减小的方向数X m,n个位置,不再赘述。可选的,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X m,n个位置,则这2X m,n+1个位置为K m个位置
Figure PCTCN2018074496-appb-000060
可选的,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X m,n/2个位置,则这X m,n+1个位置为K m个位置
Figure PCTCN2018074496-appb-000061
还可以有其它的确定方式,在此不排除。
结合第一方面或第二方面,在一种可能的设计中,当所述参考位置的个数M m>1时,所述位置索引信息包括所述M m个参考位置中一个第一参考位置的绝对位置信息,和所述M m个参考位置中除所述第一参考位置以外的其它M m-1个参考位置各自相对于所述第一参考位置的相对位置信息,所述一个绝对位置信息和所述其它M m-1个相对位置信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000062
可选的,绝对位置信息指的是,在矩阵V 2,r的列号范围1~T内,相对于数值0的位置信息。例如,若第m行的第一参考位置的绝对位置信息为T 0(取值范围为0~T-1),则所述第一参考位置位于矩阵的第m行第mod(T 0,T)+1列;再例如,若第m行的第一参考位置的绝对位置信息为T 0(取值范围为1~T),则所述第一参考位置位于矩阵的第m行第mod(T 0-1,T)+1列。可选的,相对位置信息指示的是相对于上述绝对位置信息T 0的相对位置。以M m=2为例,令相对位置信息为ΔT(ΔT为整数),则该相对位置信息指示的元素位置为V 2,r的第m行第mod(ΔT+T 0)+1列(若T 0的取值从0开始),或为V 2,r的第m行第mod(ΔT+T 0-1)+1列(若T 0的取值从1开始)。实施本发明实施例,利用信道的时域特性—信道在时域上的多条子径的时延往往较为集中,因此,所述M m-1个元素的相对位置信息的取值区间会远小于绝对位置信息的取值区间。因此,采用相对位置信息的上报方式,可以降低量化位置信息的量化比特数,从而可以节省PMI的反馈开销。例如,信道在时域上的多径的时延一共有64个采样点,则表示上述元素的一个绝对位置信息需要6比特;当信道的多径的时延取值较为集中,例如都在第一个绝对位置之后的16采样点之内,则元素的每个相对位置信息需要4比特表示。因此,上报相对位置信息可以降低PMI的反馈开销。
结合第一方面或第二方面,在一种可能的设计中,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素位置是根据所述G m个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
Figure PCTCN2018074496-appb-000063
结合第一方面或第二方面,在一种可能的设计中,所述R≥1,所述位置索引信息指示R组位置,其中,所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000064
用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。可选的,这两行对R个矩阵可以是不同的两行,例如,对矩阵V 2,1,上报的一组位置指示的是第n1和m1行的元素位置;对于矩阵V 2,2,上报的一组位置指示的是第n2和m2行的元素位置。可选的,这两行对R个矩阵可以是相同的两行。实施本发明实施例,对于R个矩阵V 2,1,…,V 2,R中的每个矩阵的至少两行,可以只上报一组位置,相较于针对矩阵V 2,r的每一行都单独上报一组位置的方式来说,节省了 PMI的反馈开销。进一步可选的,对于第r个V 2,r矩阵的2L-1行,只上报一组位置,即
Figure PCTCN2018074496-appb-000065
K m,r=K r,可以进一步节省PMI的反馈开销。同样的,这2L-1行对R个矩阵可以是不相同的2L-1行,也可以是相同的2L-1行。
需要说明的是,“位置索引信息指示R组位置”的一种实现方式是:位置索引信息包括R组位置,第二种实现方式是:位置索引信息包括M r个参考位置和M r个参考位置各自对应的窗口尺寸,根据该M r个参考位置和M r个参考位置各自对应的窗口尺寸可以确定出这R组位置中的第r组位置
Figure PCTCN2018074496-appb-000066
“所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000067
用于指示所述V 2,r中至少两行的所述K m,r个元素位置”是指:根据所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000068
可以确定出所述V 2,r中至少两行的所述K m,r个元素位置。
上述K m,r个元素位置
Figure PCTCN2018074496-appb-000069
并非实际上报的PMI的参数,而是基于所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000070
确定出的。
结合第一方面或第二方面,在一种可能的设计中,上述位置索引信息包括M r个参考位置的指示信息,所述M r个参考位置的指示信息用于指示所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000071
M r为小于T的正整数。
结合第一方面或第二方面,在一种可能的设计中,所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000072
X r,n为正整数;或者,与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000073
X r,n为正整数。
根据M r个窗口尺寸X r,n和M r个参考位置确定上述K r个位置
Figure PCTCN2018074496-appb-000074
的方法有多种。以M r=1为例。可选的,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X r,n个位置,这X r,n个位置包括于K r个位置
Figure PCTCN2018074496-appb-000075
此时,1+X r,n=K r。可选的,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X r,n-1个位置,这X r,n个位置为K r个位置
Figure PCTCN2018074496-appb-000076
此时,X r,n=K r。上述两种方法,也可以是从参考位置开始沿矩阵V 2,r的列号减小的方向数X r,n个位置,不再赘述。可选的,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X r,n个位置,则这2X r,n+1个位置为K r个位置
Figure PCTCN2018074496-appb-000077
可选的,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X r,n/2个位置,则这X r,n+1个位置为K r个位置
Figure PCTCN2018074496-appb-000078
还可以有其它的确定方式,在此不排除。
结合第一方面或第二方面,在一种可能的设计中,对于R个矩阵V 2,1,…,V 2,R的每个矩阵,以及每个矩阵中的至少两行来说,只上报一组位置,相较于针对R个矩阵V 2,r中的每一行都单独上报一组位置的方式来说,节省了PMI的反馈开销。进一步,可选的,在一种可能的设计中,对于R个矩阵V 2,1,…,V 2,R的每个矩阵,以及每个矩阵中的2L-1行来说,只上报一组位置,此时,对于第r个矩阵V 2,r,第i r行的元素位置无需通过所述索引信息进行上报,而是采用预定义的值。第r个矩阵的第i r行的行号索引可以由第一通信装置上报给第二通信装置。
结合第一方面或第二方面,在一种可能的设计中,当所述参考位置的个数M r>1时,所述位置索引信息包括所述M r个参考位置中一个第一参考位置的绝对位置信息,和所述M r个参考位置中除所述第一参考位置以外的其它M r-1个参考位置各自相对于所述第一参考位置的相对位置信息。实施本发明实施例,利用信道的时域特性—信道在时域上的多条子径的时延往往较为集中,因此,所述M r-1个元素的相对位置信息的取值区间会远小于绝对位置信息的取值区间。因此,采用相对位置信息的上报方式,可以降低量化位置信息的量化比特数,从而可以节省PMI的反馈开销。例如,信道在时域上的多径的时延一共有64个采样点,则表示上述元素的一个绝对位置信息需要6比特;当信道的多径的时延取值较为集中,例如都在第一个绝对位置之后的16采样点之内,则元素的每个相对位置信息需要4比特表示。因此,上报相对位置信息可以降低PMI的反馈开销。所述绝对位置信息和所述相对位置信息参见前面的解释,不再赘述。
结合第一方面或第二方面,在一种可能的设计中,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000079
结合第一方面或第二方面,在一种可能的设计中,所述第一指示信息还包括所述V 2,r的|A|个第一元素位置τ r,m和一个第二元素位置γ r的指示信息,m∈A,所述集合A是集合{1,...,2L}的非空子集,|A|表示集合A中元素的个数,r∈{1,...,R}。其中,所述τ r,m为所述K m,r
Figure PCTCN2018074496-appb-000080
述K m,r个元素位置
Figure PCTCN2018074496-appb-000081
中除了所述第一元素位置τ r,m之外的其它K m,r-1个元素位置上的全部或者部分系数
Figure PCTCN2018074496-appb-000082
与所述第一元素位置τ r,m上的系数
Figure PCTCN2018074496-appb-000083
的相对值,以及,所述第二指示信息还包括所述|A|个第一元素位置τ r,m中,除了所述第二元素位置γ r之外的其它|A|-1个第一元素位置上的全部或部分系数
Figure PCTCN2018074496-appb-000084
与所述第二元素位置γ r上的系数
Figure PCTCN2018074496-appb-000085
的相对值。实施本发明实施例,系数采用归一化方式进行上报,可以节省PMI的反馈开销。同时,本发明实施例使每一行的系数归一化只根据该行的系数幅度的最大值进行,可以避免由于某些行的系数幅度最大值远大于其他行的系数幅度最大值而导致的很多行的系数被归一化并量化为0值,从而在降低PMI反馈开销的同时保证PMI的反馈精度。
Figure PCTCN2018074496-appb-000086
集得到的集合。实施本发明实施例,系数采用归一化方式进行上报,可以节省PMI的反馈开销。
可选的,集合A是集合{1,...,2L}的非空真子集。此时,第一指示信息包括V 2,r的某些行 的第一元素位置τ r,m和一个第二元素位置γ r的指示信息,不包括至少一行的第一元素位置τ r,m。第二指示信息包括V 2,r的某些行上的系数信息,不包括至少一行的系数信息。第一指示信息所不包括的至少一行的第一元素位置τ r,m,以及第二指示信息所不包括的至少一行的系数信息,可以分别采用预定义的值。可选的,集合A针对不同的R个矩阵V 2,1,…,V 2,R可以不相同。在一种可能的设计中,上述方法还包括:第二通信装置发送第二配置信息,第一通信设备接收第二配置信息,第二配置信息用于指示针对第m行,位置索引信息只包括一组位置
Figure PCTCN2018074496-appb-000087
一组位置
Figure PCTCN2018074496-appb-000088
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的K m,r个元素位置。
结合第一方面或第二方面,在一种可能的设计中,
Figure PCTCN2018074496-appb-000089
为N×2L的矩阵,
Figure PCTCN2018074496-appb-000090
Figure PCTCN2018074496-appb-000091
的矩阵,
Figure PCTCN2018074496-appb-000092
属于向量集合B={b 0, b 1, ...... b M-1},PMI还包括第三指示信息,第三指示信息用于指示L个向量
Figure PCTCN2018074496-appb-000093
M为正整数,M大于等于L。
结合第一方面或第二方面,在一种可能的设计中,V 2,r=[V 2,r,1 ... V 2,r,T],其中,V 2,r中的第t列为V 2,r,t=[a r,1,t ... a r,2L,t] T,1≤t≤T,[ ] T表示转置,所述a r,m,t(1≤m≤2L)表示所述V 2,r的第m行第t列位置上的复系数。
在一种可能的设计中,上述方法还包括:第二通信装置发送第三配置信息,第一通信设备接收第三配置信息,第三配置信息用于指示位置索引信息只包括R组位置,其中,第r组位置
Figure PCTCN2018074496-appb-000094
用于指示V 2,r中至少两行的K m,r个元素位置。
在一种可能的设计中,上述方法还包括:所述第二指示信息包括的所述系数的相对值中,至少存在两个相对值的量化比特数不同。有益效果在于,可以使提高幅度较大的系数的量化精度,降低幅度较小的系数的量化精度,取得量化精度和反馈开销的折中。
可选的,上述方法可以是:存在m∈A,n∈A,并且m不等于n,满足所述第二指示信息所包括的所述K m,r-1个元素位置上的全部或者部分系数
Figure PCTCN2018074496-appb-000095
与所述第一元素位置τ r,m上的系数
Figure PCTCN2018074496-appb-000096
的相对值的量化比特数,与所述第二指示信息包括的所述K n,r-1个元素位置上的全部或者部分系数
Figure PCTCN2018074496-appb-000097
与所述第一元素位置τ r,n上的系数
Figure PCTCN2018074496-appb-000098
的相对值的量化比特数不同,
可选的,上述方法可以是所述第二指示信息包括的所有所述元素位置
Figure PCTCN2018074496-appb-000099
上除了所述第三元素位置γ r之外的全部或者部分系数与所述γ r位置上的系数的相对值中,至少存在两个相对值的量化比特数不同。
结合第一方面或第二方面,在一种可能的设计中,N为第二通信装置的天线端口数量,L为第一通信装置选择的W 1矩阵中包含的向量数量,L的取值可以由第二通信装置进行配置,或由第一通信装置上报。
结合第一方面或第二方面,在一种可能的设计中,上述DFT变换可以是有DFT操作;也可以是通过乘以DFT矩阵进行数学变换得到的。
结合第一方面或第二方面,在一种可能的设计中,上述DFT变换可以是快速傅里叶变 换(Fast Fourier Transform,FFT)变换。DFT变换和FFT变换在计算结果上是等价的。。
结合第一方面或第二方面,在一种可能的设计中,PMI包括PMI1和PMI2,其中,PMI2包括上述第一指示信息和第二指示信息。PMI1包括上述第三指示信息。
需要说明的是,在本申请实施例中,A用于确定B以及类似的表述中,确定的方法有多种,例如预先存储A的不同取值下的B的取值,因此,根据不同的A值可以确定相对应的B的取值;或者预定义计算规则,可以根据A的不同取值计算相应的B的取值。
第三方面,本申请实施例提供了一种第一通信装置,该第一通信装置包括多个功能单元,用于相应的执行第一方面或第一方面可能的实施方式中的任意一种所提供的预编码矩阵索引上报方法。
第四方面,本申请实施例提供了一种第二通信装置,该第二通信装置包括多个功能单元,用于相应的执行第二方面或第二方面可能的实施方式中的任意一种所提供的预编码矩阵索引上报方法。
第五方面,本申请实施例提供了一种第一通信装置,用于执行第一方面描述的预编码矩阵索引上报方法。所述第一通信装置可包括:存储器以及与所述存储器耦合的处理器、发射器和接收器,其中:所述发射器用于与向另一通信装置,例如网络设备,发送信号,所述接收器用于接收所述另一通信装置,例如网络设备,发送的信号,所述存储器用于存储第一方面描述的预编码矩阵索引上报方法的实现代码,所述处理器用于执行所述存储器中存储的程序代码,即执行第一方面或第一方面可能的实施方式中的任意一种所描述的预编码矩阵索引上报方法。可选地,所述处理器在执行发送操作时,通过驱动或控制所述发射器执行该发送。可选地,所述处理器在执行接收操作时,通过驱动或控制所述接收器执行该接收。
第六方面,本申请实施例提供了一种第二通信装置,用于执行第二方面描述的预编码矩阵索引上报方法。所述第二通信装置可包括:存储器以及与所述存储器耦合的处理器、发射器和接收器,其中:所述发射器用于与向另一通信装置,例如终端设备,发送信号,所述接收器用于接收所述另一通信装置,例如终端设备,发送的信号,所述存储器用于存储第二方面描述的预编码矩阵索引上报方法的实现代码,所述处理器用于执行所述存储器中存储的程序代码,即执行第二方面或第二方面可能的实施方式中的任意一种所描述的预编码矩阵索引上报方法。可选地,所述处理器在执行发送操作时,通过驱动或控制所述发射器执行该发送。可选地,所述处理器在执行接收操作时,通过驱动或控制所述接收器执行该接收。
第七方面,本申请实施例提供了一种通信系统,该通信系统包括第一通信装置和第二通信装置,所述第一通信装置包括上述第三方面或第五方面所述的第一通信装置,所述第二通信装置包括上述第四方面或第六方面所述的第二通信装置。
第八方面,本申请实施例提供了一种计算机可读存储介质,所述可读存储介质上存储有指令,当其在处理器上运行时,使得处理器执行上述第一方面描述的预编码矩阵索引上报方法。
第九方面,本申请实施例提供了一种计算机可读存储介质,所述可读存储介质上存储有指令,当其在处理器上运行时,使得处理器执行上述第二方面描述的预编码矩阵索引上 报方法。
第十方面,本申请实施例提供了一种包含指令的计算机程序,当其在处理器上运行时,使得处理器执行上述第一方面描述的预编码矩阵索引上报方法。
第十一方面,本申请实施例提供了一种包含指令的计算机程序,当其在处理器上运行时,使得处理器执行上述第二方面描述的预编码矩阵索引上报方法。
在一种可能的设计中,上述第一通信装置可以是但不限于:终端设备。上述第二通信装置可以是但不限于:网络设备。
在一种可能的设计中,上述预编码矩阵索引上报方法可以应用于但不限于:MIMO系统。
附图说明
图1是本发明实施例涉及的无线通信系统的结构示意图;
图2是本发明实施例涉及的终端设备的结构示意图;
图3是本发明实施例涉及的网络设备的结构示意图;
图4是本发明实施例提供的预编码矩阵索引上报方法的流程示意图;
图5是本发明实施例提供的一种基于参考位置和窗口尺寸确定元素位置的示意图;
图6是本发明实施例提供的另一种基于参考位置和窗口尺寸确定元素位置的示意图;
图7是本发明实施例提供的另一种基于参考位置和窗口尺寸确定元素位置的示意图;
图8是本发明实施例提供的另一种基于参考位置和窗口尺寸确定元素位置的示意图;
图9是本发明实施例提供的一种位置归一化方式上报方式示意图;
图10是本发明实施例提供的另一种位置归一化方式上报方式示意图;
图11是本发明实施例提供的一种第一通信装置的结构框图;
图12是本发明实施例提供的一种第二通信装置的结构框图。
具体实施方式
为了便于理解本发明实施例,这里先介绍本发明实施例涉及的无线通信系统。
参考图1,图1示出了本申请实施例涉及的无线通信系统。无线通信系统100可以工作在授权频段,也可以工作在非授权频段。无线通信系统100不限于长期演进(Long Term Evolution,LTE)系统,还可以是未来演进的5G系统、新无线技术(New Radio,NR)系统等。可以理解的,非授权频段的使用可以提高无线通信系统100的系统容量。如图1所示,无线通信系统100包括:一个或多个网络设备101,一个或多个终端设备102。其中:
网络设备101可以通过一个或多个天线来和终端设备102进行无线通信。各个网络设备101均可以为各自对应的覆盖范围104提供通信覆盖。网络设备101对应的覆盖范围104可以被划分为多个扇区(sector),其中,一个扇区对应一部分覆盖范围(未示出)。
在本申请实施例中,网络设备101可以包括:基站收发台(Base Transceiver Station),无线收发器,一个基本服务集(Basic Service Set,BSS),一个扩展服务集(Extended Service Set,ESS),节点B(Node B),演进的节点B(evolved NodeB,eNB或者eNodeB),或下一代节点(next-generation Node B,gNB)等等。无线通信系统100可以包括几种不同类型的网络设备 101,例如宏基站(macro base station)、微基站(micro base station)等。网络设备101可以应用不同的无线技术,例如小区无线接入技术,或者WLAN无线接入技术。
终端设备102可以分布在整个无线通信系统100中,可以是静止的,也可以是移动的。在本申请实施例中,终端设备102可以包括:移动设备,移动台(mobile station),移动单元(mobile unit),无线单元,远程单元,用户代理,移动客户端等等。
本申请中,无线通信系统100可以是多波束通信系统。其中:
网络设备101可以被配置有大规模的天线阵列,并利用波束成形技术控制天线阵列形成不同指向的波束。为了覆盖整个小区104,网络设备101需要使用多个不同指向的波束。
例如,在下行过程中,网络设备101可以依次使用不同指向的波束发射无线信号(如下行参考信号(Reference Signal,RS)和/或下行同步信号块(Synchronization Signal block,SS block)),该过程被称为波束扫描(Beam scanning)。同时,终端设备102对发射波束进行测量,确定终端设备102所能接收到的发射波束的信号质量,该过程被称为波束测量(Beam measurement)。
在未来通信系统中,终端设备102也可以被配置有天线阵列,也可以变换不同的波束进行信号的收发。也即是说,在无线通信系统100中,网络设备101和终端设备102都可能采用多波束进行通信。
本申请实施例中,无线通信系统100可以支持多载波(multi-carrier)(不同频率的波形信号)操作。多载波发射器可以在多个载波上同时发射调制信号。例如,每一个通信连接103都可以承载利用不同无线技术调制的多载波信号。每一个调制信号均可以在不同的载波上发送,也可以承载控制信息(例如参考信号、控制信道信息等),开销信息(Overhead Information),数据等等。
本申请实施例中,网络设备101向终端设备102发送信道状态信息参考信号(Channel State Information-Reference Signal,CSI-RS),用于终端设备102测量信道状态信息(Channel State Information,CSI)。CSI包括秩指示(Rank Index,RI)、预编码矩阵指示(Precoding Matrix Index,PMI)和信道质量指示(Channel Quality Index,CQI)中的一个或多个。终端设备102向网络设备101反馈CSI,终端设备102反馈的CSI包括PIM、RI和CQI中的一个或多个。其中,PMI用于网络设备101确定预编码矩阵,RI用于推荐网络设备101给终端设备102在相同的时频资源上发送的数据层数,CQI辅助网络设备101确定调制编码方式,以提高传输可靠性和效率。之后,网络设备101向终端设备102发送下行数据时,可以采用根据PMI确定的预编码矩阵,或根据PMI和其他信息共同决定的预编码矩阵对下行数据进行预编码处理。在两级码本结构下,PMI可以进一步分为PMI1和PMI2,PMI1为公共参数,对所有层的数据的预编码矩阵是相同的,PMI2为非公共参数,对每个层数据的预编码矩阵是不同的。
参考图2,图2示出了本申请实施例提供的终端设备。如图2所示,终端设备200可包括:输入输出模块(包括音频输入输出模块218、按键输入模块216以及显示器220等)、用户接口202、一个或多个处理器204、发射器206、接收器208、耦合器210、天线214以及存储器212。这些部件可通过总线或者其它方式连接,图2以通过总线连接为例。其中:
天线214可用于将电磁能转换成自由空间中的电磁波,或者将自由空间中的电磁波转换成传输线中的电磁能。耦合器210用于将天线214接收到的移动通信信号分成多路,分配给多个的接收器208。
发射器206可用于对处理器204输出的信号进行发射处理。
接收器208可用于对天线214接收的移动通信信号进行接收处理。
在本申请实施例中,发射器206和接收器208可看作一个无线调制解调器。在终端设备200中,发射器206和接收器208的数量均可以是一个或者多个。
除了图2所示的发射器206和接收器208,终端设备200还可包括其他通信部件,例如GPS模块、蓝牙(Bluetooth)模块、无线高保真(Wireless Fidelity,Wi-Fi)模块等。不限于上述表述的无线通信信号,终端设备200还可以支持其他无线通信信号,例如卫星信号、短波信号等等。不限于无线通信,终端设备200还可以配置有有线网络接口(如LAN接口)201来支持有线通信。
所述输入输出模块可用于实现终端设备200和用户/外部环境之间的交互,可主要包括音频输入输出模块218、按键输入模块216以及显示器220等。具体的,所述输入输出模块还可包括:摄像头、触摸屏以及传感器等等。其中,所述输入输出模块均通过用户接口202与处理器204进行通信。
存储器212与处理器204耦合,用于存储各种软件程序和/或多组指令。具体的,存储器212可包括高速随机存取的存储器,并且也可包括非易失性存储器,例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。存储器212可以存储操作系统(下述简称系统),例如ANDROID,IOS,WINDOWS,或者LINUX等嵌入式操作系统。存储器212还可以存储网络通信程序,该网络通信程序可用于与一个或多个附加设备,一个或多个终端设备,一个或多个网络设备进行通信。存储器212还可以存储用户接口程序,该用户接口程序可以通过图形化的操作界面将应用程序的内容形象逼真的显示出来,并通过菜单、对话框以及按键等输入控件接收用户对应用程序的控制操作。
在本申请实施例中,存储器212可用于存储本申请的一个或多个实施例提供的预编码矩阵索引上报方法在终端设备200侧的实现程序。关于本申请的一个或多个实施例提供的预编码矩阵索引上报方法的实现,请参考后续实施例。
处理器204可用于读取和执行计算机可读指令。具体的,处理器204可用于调用存储于存储器212中的程序,例如本申请的一个或多个实施例提供的系统消息接收方法在终端设备200侧的实现程序,并执行该程序包含的指令以实现后续实施例涉及的方法。处理器204可支持:全球移动通信系统(Global System for Mobile Communication,GSM)(2G)通信、宽带码分多址(Wideband Code Division Multiple Access,WCDMA)(3G)通信,以及长期演进(Long Term Evolution,LTE)(4G)通信、以及5G通信等等中的一个或多个。可选地,当处理器204发送任何消息或数据时,其具体通过驱动或控制发射器206做所述发送。可选地,当处理器204接收任何消息或数据时,其具体通过驱动或控制接收器208做所述接收。因此,处理器204可以被视为是执行发送或接收的控制中心,发射器206和接收器208是发送和接收操作的具体执行者。
可以理解的,终端设备200可以是图1示出的无线通信系统100中的终端设备102, 可实施为移动设备,移动台(mobile station),移动单元(mobile unit),无线单元,远程单元,用户代理,移动客户端等等。
需要说明的,图2所示的终端设备200仅仅是本申请实施例的一种实现方式,实际应用中,终端设备200还可以包括更多或更少的部件,这里不作限制。
参考图3,图3示出了本申请实施例提供的网络设备。如图3所示,网络设备300可包括:一个或多个处理器301、存储器302、网络接口303、发射器305、接收器306、耦合器307和天线308。这些部件可通过总线304或者其他方式连接,图3以通过总线连接为例。其中:
网络接口303可用于网络设备300与其他通信设备,例如其他网络设备,进行通信。具体的,网络接口303可以是有线接口。
发射器305可用于对处理器301输出的信号进行发射处理,例如信号调制。接收器306可用于对天线308接收的移动通信信号进行接收处理。例如信号解调。在本申请的一些实施例中,发射器305和接收器306可看作一个无线调制解调器。在网络设备300中,发射器305和接收器306的数量均可以是一个或者多个。天线308可用于将传输线中的电磁能转换成自由空间中的电磁波,或者将自由空间中的电磁波转换成传输线中的电磁能。耦合器307可用于将移动通信号分成多路,分配给多个的接收器306。
存储器302与处理器301耦合,用于存储各种软件程序和/或多组指令。具体的,存储器302可包括高速随机存取的存储器,并且也可包括非易失性存储器,例如一个或多个磁盘存储设备、闪存设备或其他非易失性固态存储设备。存储器302可以存储操作系统(下述简称系统),例如uCOS、VxWorks、RTLinux等嵌入式操作系统。存储器302还可以存储网络通信程序,该网络通信程序可用于与一个或多个附加设备,一个或多个终端设备,一个或多个网络设备进行通信。
处理器301可用于进行无线信道管理、实施呼叫和通信链路的建立和拆除,并为本控制区内的用户提供小区切换控制等。具体的,处理器301可包括:管理/通信模块(Administration Module/Communication Module,AM/CM)(用于话路交换和信息交换的中心)、基本模块(Basic Module,BM)(用于完成呼叫处理、信令处理、无线资源管理、无线链路的管理和电路维护功能)、码变换及子复用单元(Transcoder and SubMultiplexer,TCSM)(用于完成复用解复用及码变换功能)等等。
本申请实施例中,处理器301可用于读取和执行计算机可读指令。具体的,处理器301可用于调用存储于存储器302中的程序,例如本申请的一个或多个实施例提供的预编码矩阵索引上报方法在网络设备300侧的实现程序,并执行该程序包含的指令。
可以理解的,网络设备300可以是图1示出的无线通信系统100中的网络设备101,可实施为基站收发台,无线收发器,一个基本服务集(BSS),一个扩展服务集(ESS),NodeB,eNodeB,gNB等等。
需要说明的是,图3所示的网络设备300仅仅是本申请实施例的一种实现方式,实际应用中,网络设备300还可以包括更多或更少的部件,这里不作限制。
需要说明的是,下述各实施例中所描述的第一通信装置可以包括但不限于上述终端设 备,第二通信装置可以包括但不限于上述网络设备。
基于前述无线通信系统100、终端设备200以及网络设备300分别对应的实施例,本申请实施例提供了一种预编码矩阵索引上报方法。该方法包括但不限于如下步骤:
S401、第一通信装置确定秩指示RI和预编码矩阵指示PMI。
本发明实施例中,第一通信装置包括但不限于:终端设备。
具体的,第一通信装置生成RI和PMI对应的比特序列。
其中,所述PMI用于确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵W r满足W r=W 1×W 2,r,r∈{1,...,R}。具体的根据PMI确定预编码矩阵W 1,…,W R的方式,参见前述发明内容部分说明,此处不在赘述。
这里,R表示的是第一通信装置推荐的第二通信装置在相同的时频资源上给第一通信装置传输的数据层数。R是由RI确定的,RI为非负整数,R为正整数。RI可以从0开始取值,在这种情况下,R=RI+1。例如,当RI=0时,R=1,代表传1层数据;当RI=1时,R=2,代表传2层数据。具体的确定方式参见前述表1、表2、表3或表4,此处不再赘述。
W 1是N行2L列的矩阵,可选的,N为第二通信装置的端口数量,L为所述W 1矩阵包括的波束数量,N和L均为正整数。可选的,N可以取集合{4,8,12,16,24,32}中的数值。W 1矩阵可以参见下述公式1-1。
Figure PCTCN2018074496-appb-000100
其中,W 1矩阵为N行2L列的矩阵,W 1矩阵中的
Figure PCTCN2018074496-appb-000101
为N/2行L列的矩阵,其中每个
Figure PCTCN2018074496-appb-000102
属于向量集合B={b 0, b 1, ...... b M-1}。这里,M为正整数,M大于等于L。因此,W 1矩阵的表达式可以参见如下公式1-2。
Figure PCTCN2018074496-appb-000103
可选的,所述向量集合B中的向量为离散傅里叶(DFT)向量。
PMI包括第三指示信息,所述第三指示信息用于指示所述L个向量
Figure PCTCN2018074496-appb-000104
可选的,所述第一通信装置和第二通信装置预先存储所述集合B中的每个向量以及每个向量与PMI的映射关系,并根据PMI中某些参数的取值进行映射从而确定所述L个向量
Figure PCTCN2018074496-appb-000105
进而确定W 1矩阵;或者,预先定义所述集合B中的每个向量的生成公式(如预定义一个表格,该表格可以根据相关参数生成集合B中的向量),所述第一通信装置和第二通信装置根据PMI中某些参数的取值计算得到所述L个向量
Figure PCTCN2018074496-appb-000106
进而确定W 1矩阵。
具体的,第二通信装置发送信道状态信息参考信号CSI-RS,用于第一通信装置测量信道状态信息CSI。CSI包括RI、PMI和CQI中的一个或多个。其中,在两级码本结构下,PMI包括PMI1和PMI2,用于推荐第二通信装置对该第一通信装置进行数据传输时使用的预编码矩阵。由于信道具有频率选择特性,因此,在CSI反馈带宽内的不同频域粒度上,PMI指示的预编码矩阵不同。可选的,频域粒度可以是一个资源块(Resource Block,RB), 或者是一个子带(一个子带包括多个连续的RB),或者是一个资源块组(Resource Block Group,RBG,一个RBG包括多个连续的RB)。
可选的,在第f个频域粒度上的预编码矩阵,可以是该频域粒度上第二通信装置到该第一通信装置的下行信道矩阵H f的发送端特征向量,即对H f HH f进行特征值分解得到的RI个特征量,f=1,…,F。可选的,在第f个频域粒度上的预编码矩阵,可以是根据该频域粒度上第二通信装置到该第一通信装置的下行信道矩阵H f的发送端特征向量进行变换得到的,例如,根据多个第一通信装置的发送端特征向量得到该频域粒度上的预编码矩阵(可以根据最小均方误差准则、迫零准则或其他准则)。F是由第一通信设备与第二通信设备的CSI反馈带宽的频域粒度数量确定的。为了表示第f个RB上的R个特征向量,第一通信装置首先选择L个波束向量
Figure PCTCN2018074496-appb-000107
构成上述W 1矩阵。其中,L个波束向量可以是正交的波束向量,也可以是非正交的波束向量。故,PMI1用于指示第一通信装置选择的L个波束向量
Figure PCTCN2018074496-appb-000108
该L个波束的选择对CSI反馈带宽内的所有频域粒度是一致的,并且对所有RI个特征向量也是一致的。
可选的,根据选择的W 1,第一通信装置对R f=(H fW 1) H(H fW 1)∈C 2L×2L做特征值分解,并选择其中的R个特征向量构成如下1-3矩阵:
Figure PCTCN2018074496-appb-000109
其中,
Figure PCTCN2018074496-appb-000110
的第r列为R f的第r个特征向量,
Figure PCTCN2018074496-appb-000111
为矩阵
Figure PCTCN2018074496-appb-000112
在第r列第j+1行的系数,为复数,包括幅度和相位。
可选的,经过统计,第一通信装置针对
Figure PCTCN2018074496-appb-000113
的每一列选择并上报一个频域的系数参考位置i r(i r的上报可以放在PMI1中也可以放在PMI2中),该列的其它2L-1个系数均以该系数参考位置上的系数为基准做归一化:
Figure PCTCN2018074496-appb-000114
得到归一化后的W 2,f矩阵:
Figure PCTCN2018074496-appb-000115
可选的,每一列的上述频域系数参考位置可以是该列系数中,宽带幅度最大的系数所在的行号。一个系数的宽带幅度可以是统计了所有F个频域粒度上该系数的幅度之后,进行平均计算或平方平均计算或其它操作统计得到的。可选的,每一列的上述频域系数参考位置还可以是该列固定某一行(如第一行)的系数位置。本发明方案不限定上述频域系数参考位置的选择方法。
可选的,第一通信装置针对
Figure PCTCN2018074496-appb-000116
的每一列不进行上述归一化操作,直接得到的W 2,f矩阵, 即
Figure PCTCN2018074496-appb-000117
如何由
Figure PCTCN2018074496-appb-000118
得到W 2,f,还可以有其它方案,本发明方案不限定。
确定W 2,f矩阵后,,针对该矩阵的第r列第j+1行的元素w j,r,f(r=1,…,R;j=0,…,2L-1),将该元素在所有F个频域粒度上的取值串联起来组成向量[w j,r,1,...,w j,r,F],从而组成如下公式1-4a所示W 2,r矩阵:
Figure PCTCN2018074496-appb-000119
则上述矩阵W 1和W 2,r矩阵的第f列(f=1,…,F)构成了在第f个频域粒度上的第r层数据的预编码向量,即W r(f)=W 1×W 2,r(f),其中X(f)表示取出矩阵X的第f列,因此有表达式:W r=W 1×W 2,r。在同一个频域粒度f上,将每一层数据的预编码向量W r(f)拼起来也可以得到该频域粒度上所有层的预编码矩阵:[W 1(f),...,W R(f)]。
确定向量[w j,r,1,...,w j,r,F]后,第一通信装置对该向量进行IDFT(或逆快速傅里叶变换,IFFT)操作获得对应的时域信号向量[a r,j,1,...,a r,j,T](T是大于等于F的最小的2的幂次方数,F为正整数),并作为V 2,r矩阵的第j+1行,从而获得W 2,f矩阵的第r列对应的时域V 2,r矩阵参见下述公式1-5:
Figure PCTCN2018074496-appb-000120
其中,V 2,r是2L行T列的矩阵。根据上面的变换关系可知,将V 2,r的第l行做DFT变换得到上述W 2,r的第l行,l∈{1,...,2L}。这里,DFT变换可以是有DFT操作;也可以是通过乘以DFT矩阵进行数学变换得到的。可选的,上述DFT变换还可以是FFT变换。
PMI包括第一指示信息和第二指示信息,第一指示信息包括位置索引信息,位置索引信息用于指示V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000121
这里,元素位置可以理解为时域抽头位置,在这些元素位置上的系数是非零的,或者是大于或等于预定值的。V 2,r的第m行上在非这些元素位置上的元素取预定义的值(如0)。上述元素位置的个数K m,r可以是预定义的值,或者是第二通信装置配置给第一通信装置的,或者是由第一通信装置上报的。其中,K m,r为正整数,K m,r小于T。
在一种可能的实现方式中,RI≥2,针对第m行,位置索引信息指示一组位置
Figure PCTCN2018074496-appb-000122
该一组位置
Figure PCTCN2018074496-appb-000123
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。也即是说,当上报V 2,r矩阵第m行的元素位置时,对于所有R个V 2,r矩阵的第m行,可以只上报一组位置,即上报的上述K m,r个元素位置针对不同的r的取值是相同的,相较于针对每个V 2,r矩阵的第m 行都单独上报一组位置的方式来说,,节省了PMI的反馈开销。针对不同层的预编码矩阵,同一个波束(即R个矩阵的同一行)对应的信道时域多径的位置非常接近,因此,采用对所有R个矩阵的同一行值上报一组位置的方法,带来的性能损失较小,但可以大幅度降低PMI的反馈开销。
可选的,上述位置索引信息包括M m个参考位置
Figure PCTCN2018074496-appb-000124
的指示信息,所述M m个参考位置
Figure PCTCN2018074496-appb-000125
的指示信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000126
M m为小于T的正整数。
可选的,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置d m,n相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000127
X m,n为正整数。或者,与所述M m个参考位置中第n(n=1,…,M m)个参考位置d m,n相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000128
X m,n为正整数。这种情况下,M m个窗口尺寸可以是第二通信装置通过配置信息配置给第一通信装置的。
根据M m个窗口尺寸X m,n和M m个参考位置确定上述K m个位置
Figure PCTCN2018074496-appb-000129
的方法有多种。以M m=1为例。可选的,参见图5所示,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X m,n个位置,这X m,n个位置包括于K m个位置
Figure PCTCN2018074496-appb-000130
此时,1+X m,n=K m。可选的,参见图6所示,从参考位置开始(包括包括参考位置)沿矩阵V 2,r的列号增大的方向数X m,n-1个位置,这X m,n个位置为K m个位置
Figure PCTCN2018074496-appb-000131
此时,X m,n=K m。上述两种方法,也可以是从参考位置开始沿矩阵V 2,r的列号减小的方向数X m,n个位置,不再赘述。可选的,参见图7所示,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X m,n个位置,则这2X m,n+1个位置为K m个位置
Figure PCTCN2018074496-appb-000132
可选的,参见图8所示,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X m,n/2个位置,则这X m,n+1个位置为K m个位置
Figure PCTCN2018074496-appb-000133
还可以有其它的确定方式,在此不排除。
可选的,当所述参考位置的个数M m>1时,所述位置索引信息包括所述M m个参考位置中一个第一参考位置的绝对位置信息,和所述M m个参考位置中除所述第一参考位置以外的其它M m-1个参考位置各自相对于所述第一参考位置的相对位置信息。实施本发明实施例,利用信道的时域特性—信道在时域上的多条子径的时延往往较为集中,因此,所述M m-1个元素的相对位置信息的取值区间会远小于绝对位置信息的取值区间。因此,采用相对位置信息的上报方式,可以降低量化位置信息的量化比特数,从而可以节省PMI的反馈开销。例如,信道在时域上的多径的时延一共有64个采样点,则表示上述元素的一个绝对位置信息需要6比特;当信道的多径的时延取值较为集中,例如都在第一个绝对位置之后的16采样点之内,则元素的每个相对位置信息需要4比特表示。因此,上报相对位置信息可以降低PMI的反馈开销。
可选的,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素 位置是根据所述G m个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
Figure PCTCN2018074496-appb-000134
在这种情况下,当时域窗口内并非所有的元素位置都被选中作为K m,r个元素位置
Figure PCTCN2018074496-appb-000135
时,需要额外上报实际选中的K m,r个元素位置
Figure PCTCN2018074496-appb-000136
在另一种可能的实现方式中,所述R≥1,所述位置索引信息指示R组位置,其中,第r组所述位置
Figure PCTCN2018074496-appb-000137
用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。对于R个矩阵V 2,1,…,V 2,R中的每个矩阵的至少两行,可以只上报一组位置,相较于针对矩阵V 2,r的每一行都单独上报一组位置的方式来说,节省了PMI的反馈开销。进一步可选的,对于第r个V 2,r矩阵的2L-1行,只上报一组位置,即
Figure PCTCN2018074496-appb-000138
K m,r==K r。相较于针对R层中每一层的矩阵V 2,r中的每一行都单独上报一组位置的方式来说,节省了PMI的反馈开销。当该第一通信装置与第二通信装置之间的信道的多径非常集中时,各个波束对应元素位置是很接近的。因此,针对至少两行只上报一组位置,带来的性能损失很少,但可以降低上报开销。
可选的,上述每个矩阵的至少两行中的这两行对R个矩阵可以是不同的两行,例如,对矩阵V 2,1,上报的一组位置指示的是第n1和m1行的元素位置;对于矩阵V 2,2,上报的一组位置指示的是第n2和m2行的元素位置。可选的,这两行对R个矩阵可以是相同的两行。实施本发明实施例,对于R个矩阵V 2,1,…,V 2,R中的每个矩阵的至少两行,可以只上报一组位置,相较于针对矩阵V 2,r的每一行都单独上报一组位置的方式来说,节省了PMI的反馈开销。进一步可选的,对于第r个V 2,r矩阵的2L-1行,只上报一组位置,即
Figure PCTCN2018074496-appb-000139
K m,r=K r,可以进一步节省PMI的反馈开销。同样的,这2L-1行对R个矩阵可以是不相同的2L-1行,也可以是相同的2L-1行。
可选的,上述位置索引信息包括M r个参考位置
Figure PCTCN2018074496-appb-000140
的指示信息,所述M r个参考位置
Figure PCTCN2018074496-appb-000141
的指示信息用于指示所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000142
M r为小于T的正整数。
可选的,所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位置d r,n相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000143
X r,n为正整数;或者,与所述M r个参考位置中第n(n=1,…,M r)个参考位置d r,n相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000144
X r,n为正整数。这种情况下,M r个窗口尺寸可以是第二通信装置通过配置信息配置给第一通信装置的。
根据M r个窗口尺寸X r,n和M r个参考位置确定上述K r个位置
Figure PCTCN2018074496-appb-000145
的方法有多种。以M r=1为例。可选的,从参考位置开始(包括参考位置)沿矩阵V 2,r的列号增大的方向数X r,n个位置,这X r,n个位置包括于K r个位置
Figure PCTCN2018074496-appb-000146
此时,1+X r,n=K r。可选的,从参考位置开始(包括包括参考位置)沿矩阵V 2,r的列号增大的方向数X r,n-1个位置,这X r,n个位置为K r个位置
Figure PCTCN2018074496-appb-000147
此时,X r,n=K r。上述两种方法,也可以是从参考位置开始沿矩阵V 2,r的列号减小的方向数X r,n个位置,不再赘述。可选的,以参考位置为中心位置,分别沿 矩阵V 2,r的列号减小和增大的方向分别数X r,n个位置,则这2X r,n+1个位置为K r个位置
Figure PCTCN2018074496-appb-000148
可选的,以参考位置为中心位置,分别沿矩阵V 2,r的列号减小和增大的方向分别数X r,n/2个位置,则这X r,n+1个位置为K r个位置
Figure PCTCN2018074496-appb-000149
还可以有其它的确定方式,在此不排除。具体计算方式可以参考前述图5至图8所示的计算方式,此处不再赘述。
可选的,上述窗口尺寸X m,n或X r,n的取值可以是预定义的,或者第二通信装置配置的,或者第一通信装置上报的。本发明实施例中,窗口尺寸是用于表征多个元素位置所构成的时域窗口的长度的。
当所述参考位置的个数M r>1时,所述位置索引信息包括所述M r个参考位置中一个第一参考位置的绝对位置信息,和所述M r个参考位置中除所述第一参考位置以外的其它M r-1个参考位置各自相对于所述第一参考位置的相对位置信息。所述绝对位置信息和所述相对位置信息的含义请参见前述发明内容部分,不再赘述。实施本发明实施例,利用信道的时域特性—信道在时域上的多条子径的时延往往较为集中,因此,所述M r-1个元素的相对位置信息的取值区间会远小于绝对位置信息的取值区间。因此,采用相对位置信息的上报方式,可以降低量化位置信息的量化比特数,从而可以节省PMI的反馈开销。例如,信道在时域上的多径的时延一共有64个采样点,则表示上述元素的一个绝对位置信息需要6比特;当信道的多径的时延取值较为集中,例如都在第一个绝对位置之后的16采样点之内,则元素的每个相对位置信息需要4比特表示。因此,上报相对位置信息可以降低PMI的反馈开销。
结合第一方面或第二方面,在一种可能的设计中,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000150
在这种情况下,当时域窗口内并非所有的元素位置都被选中作为K m,r个元素位置
Figure PCTCN2018074496-appb-000151
时,需要额外上报实际选中的K m,r个元素位置
Figure PCTCN2018074496-appb-000152
当M m>1或M r>1时,M m或M r个参考位置的上报包括但不限于如下两种方式。第一种上报方式为,M m或M r个参考位置的上报采用独立上报的方式,即每个参考位置分别上报位于1~T(或0~T-1)的绝对数值。可选的,每个绝对数值的量化比特数为
Figure PCTCN2018074496-appb-000153
比特。第二种上报方式为,M m或M r个参考位置的上报可以采用相对位置上报的方式,即M m或M r个参考位置中一个(或某一个预定义位置的)参考位置采用绝对数值上报的方式,其余M m-1或M rr-1个参考位置上报相对于上述一个(或某一个预定义位置的)参考位置的相对位置信息。可选的,绝对数值的量化比特数为
Figure PCTCN2018074496-appb-000154
比特,相对位置的量化比特数为
Figure PCTCN2018074496-appb-000155
比特,其中,
Figure PCTCN2018074496-appb-000156
第二种上报方式的好处在于:当各个时域窗口的位置非常接近时,上报相对位置信息需要的比特数比上报绝对位置信息需要的比特数更少,可以降低上报开销。可选的,上述相对位置信息可以是通过求差、求商等方式算得的相对值。
确定了各行的K m,r个元素位置之后,还需要指示各个元素位置上的系数。这里系数为 复系数,包括系数幅度和系数相位。上述第二指示信息用于指示V 2,r的第m行中在元素位置
Figure PCTCN2018074496-appb-000157
上的K m,r个复系数
Figure PCTCN2018074496-appb-000158
V 2,r是由K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000159
确定的,m∈{1,...,2L},i∈{1,...,K m,r}。
Figure PCTCN2018074496-appb-000160
置。第二指示信息包括K m,r个元素位置
Figure PCTCN2018074496-appb-000161
中除了第一元素位置τ r,m之外的其它K m,r-1个元素位置上的全部或部分系数
Figure PCTCN2018074496-appb-000162
与第一元素位置τ r,m上的系数
Figure PCTCN2018074496-appb-000163
的相对值,这里,相对值可以是差值或商的量化值,例如:
Figure PCTCN2018074496-appb-000164
的量化值,或者
Figure PCTCN2018074496-appb-000165
Figure PCTCN2018074496-appb-000166
的量化值,或者
Figure PCTCN2018074496-appb-000167
的量化值,或者
Figure PCTCN2018074496-appb-000168
的量化值。第二指示信息还包括|A|个第一元素位置τ r,m中除了第二元素位置γ r之外的其它|A|-1个第一元素位置上的系数
Figure PCTCN2018074496-appb-000169
与第二元素位置γ r上的系数
Figure PCTCN2018074496-appb-000170
的相对值。这里,相对值可以是差值或商,例如:
Figure PCTCN2018074496-appb-000171
的量化值,或者
Figure PCTCN2018074496-appb-000172
的量化值,或者
Figure PCTCN2018074496-appb-000173
的量化值,或者
Figure PCTCN2018074496-appb-000174
的量化值。在另一种可能的实现中,第一指示信息包括V 2,r的一个第三元
Figure PCTCN2018074496-appb-000175
表一个被选择的元素位置上的元素。第一指示信息针对2L-1行分别指示相应的元素位置,并指示第m行对应的K m,r个元素位置
Figure PCTCN2018074496-appb-000176
上系数幅度最大的元素位置τ r,m(图中位置1、位置2、位置3)。第二指示信息指示该行的
Figure PCTCN2018074496-appb-000177
除了τ r,m之外位置上的全部或部分系数相对于τ r,m位置上的系数的归一化值
Figure PCTCN2018074496-appb-000178
的量化值(图中虚线所示)。此外,第一指示信息还指示2L-1个τ r,m中,对应系数幅度最大的位置γ r(图中位置4),第二指示信息还指示除γ r之外的2L-2个τ r,m位置上的系数相对于γ r位置的系数的归一化值
Figure PCTCN2018074496-appb-000179
的量化值(图中实线所示)。本实施例中,是以|A|=2L-1为例进行说明的。
该方法的好处在于:若V 2,r矩阵的某一行上的系数的幅度相对与另外一行的系数幅度较小,该归一化方法仍然可以使该邟的系数能够不全部归一化并量化为0,可以提高PMI的反馈精度。
又例如,如图10所示(以各个行选择的K m,r个元素位置相同为例),第一指示信息针对2L-1行分别指示相应的元素位置,并指示这全部2L-1行对应的K m,r个元素位置
Figure PCTCN2018074496-appb-000180
上系数幅度最大的元素位置γ r(图中位置5),以及所有行的K m,r个元素位置
Figure PCTCN2018074496-appb-000181
上非γ r位置上的全部或部分系数相对于γ r位置上系数的归一化值的量化值(图中实线所示)。该方法的好处在于:可以使能量较强的波束的PMI反馈精度更高。
在量化各个系数的相对值时,可以采用不同的量化方法。
在一种可能的实现中,所述第二指示信息包括的所述系数的相对值中,至少存在两个 相对值的量化比特数不同。例如,在第二指示信息包括的所有系数相对值中,按照相对值的幅度进行排序,幅度值最大的P个系数相对值采用的量化比特数比其它系数相对值采用的量化比特数多。这里的量化比特数的比较可以是幅度量化比特数和或相位量化比特数。该方法的好处在于:在PMI上报开销相同的情况下,提高幅度较大的系数相对值的量化精度,降低幅度较小的系数相对值的量化精度,整体上可以提高整个PMI的反馈精度。
进一步,在一种可能的实现中,针对某个矩阵V 2,r的第m行和第n行(m不等于n),上报的所述K m,r-1个元素位置上的系数相对值的量化比特数比所述K n,r-1个元素位置上的系数相对值的量化比特数多。这里的量化比特数的比较可以是幅度量化比特数和或相位量化比特数。该方法的好处在于:在PMI上报开销相同的情况下,提高W 1的L个向量中能量较强的向量对应的系数相对值的量化精度,降低能量较弱的向量对应的系数相对值的量化精度,整体上可以提高整个PMI的反馈精度。
Figure PCTCN2018074496-appb-000182
例如,第一通信装置可以按照相对值的幅度进行排序,幅度值最大的P个系数相对值采用的量化比特数比其它系数相对值采用的量化比特数多。这里的量化比特数的比较可以是幅度量化比特数和或相位量化比特数。该方法的好处在于:在PMI上报开销相同的情况下,提高幅度较大的系数相对值的量化精度,降低幅度较小的系数相对值的量化精度,整体上可以提高整个PMI的反馈精度。
S402、第一通信装置发送秩指示RI和预编码矩阵指示PMI。
S403、第二通信装置接收秩指示RI和预编码矩阵指示PMI,根据PMI确定R层中的第r(r=1,…,R)层的预编码矩阵W r=W 1*W 2,r
本发明实施例中,第一通信装置包括但不限于:网络设备。
本发明实施例中,第二通信装置根据第一通信装置上报的RI和PMI,恢复每个层的时域矩阵V 2,r。第二通信装置根据RI确定R。第二通信装置对V 2,r做DFT变换,得到每个子带或RB上的频域V2矩阵W 2,r。结合第一通信装置上报的L个向量
Figure PCTCN2018074496-appb-000183
得到W1矩阵。则根据W1和W 2,r矩阵,确定第f个RB/子带上的预编码矩阵。在得到预编码矩阵后,在发送下行数据时,采用预编码矩阵对下行数据进行预编码处理。
可选的,上述方法还包括:第二通信装置发送第二配置信息,第一通信设备接收第二配置信息,第二配置信息用于指示针对第m行,位置索引信息只包括一组位置
Figure PCTCN2018074496-appb-000184
一组位置
Figure PCTCN2018074496-appb-000185
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的相同的K m,r个元素位置。或者,一组位置
Figure PCTCN2018074496-appb-000186
用于指示R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的相同的K m,r个元素位置还可以是协议规定的。
可选的,上述方法还包括:第二通信装置发送第三配置信息,第一通信设备接收第三配置信息,第三配置信息用于指示位置索引信息只包括R组位置,其中,第r组位置
Figure PCTCN2018074496-appb-000187
用于指示V 2,r中至少两行的相同的K m,r个元素位置。或者,第r组位置
Figure PCTCN2018074496-appb-000188
用于指示V 2,r中至少两行的相同的K m,r个元素位置还可以是协议规定的。
实施本发明实施例,在进行预编码矩阵索引上报时,可以只上报部分元素位置,以及该部分元素位置上的系数幅度和系数相位,可以节省PMI的反馈开销。在进行多个元素位 置上报时,可以通过位置归一化方式上报,进一步节省PMI的反馈开销。在进行系数幅度和系数相位上报时,可以通过归一化方式上报,进一步节省PMI的反馈开销。
参见图11,图11示出了本申请提供一种第一通信装置的结构框图。如图11所示,第一通信装置110可包括:确定单元1101和发送单元1102。
确定单元1101,可用于确定秩指示RI和预编码矩阵指示PMI,所述PMI用于确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵满足W r=W 1×W 2,r,r∈{1,...,R};
所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000189
所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
Figure PCTCN2018074496-appb-000190
上的K m,r个复系数
Figure PCTCN2018074496-appb-000191
所述V 2,r是由所述K m,r个元素位置和所述K m,r个复系数
Figure PCTCN2018074496-appb-000192
确定的,m∈{1,...,2L},i∈{1,...,K m,r};
其中,所述RI为非负整数,所述N、L、F、T和K m,r均为正整数,K m,r小于T,F小于等于T;
发送单元1102,可用于发送所述RI和所述PMI。
可选的,所述R≥2,针对所述第m行,所述位置索引信息指示一组位置
Figure PCTCN2018074496-appb-000193
所述一组位置
Figure PCTCN2018074496-appb-000194
用于指示所述R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的所述K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。
可选的,所述R≥1,所述位置索引信息指示R组位置,其中,所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000195
用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。
可选的,所述位置索引信息包括M m个参考位置的指示信息,所述M m个参考位置的指示信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000196
M m为小于T的正整数。
可选的,所述位置索引信息包括M r个参考位置的指示信息,所述M r个参考位置的指示信息用于指示所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000197
M r为小于T的正整数。
可选的,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000198
X m,n为正整数;
或者,
与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000199
X m,n为正整数。
可选的,所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位 置相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000200
X r,n为正整数;
或者,
与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000201
X r,n为正整数。
可选的,当所述参考位置的个数G m,r>1时,所述位置索引信息包括所述G m,r个参考位置中一个第一参考位置的绝对位置信息,和所述G m,r个参考位置中除所述第一参考位置以外的其它G m,r-1个参考位置各自相对于所述第一参考位置的相对位置信息,其中,G m,r=M m,或者G m,r=M r
可选的,当G m,r=M m时,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素位置是根据所述G m个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
Figure PCTCN2018074496-appb-000202
或者,
当G m,r=M r时,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000203
可选的,所述第一指示信息还包括所述V 2,r的|A|个第一元素位置τ r,m和一个第二元素位置γ r的指示信息,m∈A,所述集合A是集合{1,...,2L}的非空子集,|A|表示集合A中元素的个数,r∈{1,...,R};
Figure PCTCN2018074496-appb-000204
置;
所述第二指示信息包括所述K m,r个元素位置
Figure PCTCN2018074496-appb-000205
中除了所述第一元素位置τ r,m之外的其它K m,r-1个元素位置上的全部或者部分系数
Figure PCTCN2018074496-appb-000206
与所述第一元素位置τ r,m上的系数
Figure PCTCN2018074496-appb-000207
的相对值,
以及,所述第二指示信息还包括所述|A|个第一元素位置τ r,m中,除了所述第二元素位置γ r之外的其它|A|-1个第一元素位置上的系数
Figure PCTCN2018074496-appb-000208
与所述第二元素位置γ r上的系数
Figure PCTCN2018074496-appb-000209
的相对值。
Figure PCTCN2018074496-appb-000210
γ r之外,其它元素位置上的全部或者部分系数与所述γ r位置上的系数的相对值,
Figure PCTCN2018074496-appb-000211
为通过对所有属于集合A的元素m对应的集合
Figure PCTCN2018074496-appb-000212
取并集 得到的集合。
可选的,所述第二指示信息包括的所述系数的相对值中,至少存在两个相对值的量化比特数不同。
可选的,所述
Figure PCTCN2018074496-appb-000213
为N行2L列的矩阵,
Figure PCTCN2018074496-appb-000214
为N/2行L列的矩阵,
Figure PCTCN2018074496-appb-000215
属于向量集合B={b 0, b 1, ...... b M-1},所述PMI还包括第三指示信息,所述第三指示信息用于指示所述L个向量
Figure PCTCN2018074496-appb-000216
M为正整数,M大于等于L。
可选的,所述V 2,r=[V 2,r,1 ... V 2,r,T],其中,所述V 2,r中的第t列为V 2,r,t=[a r,1,t ... a r,2L,t] T,1≤t≤T,[ ] T表示转置。
可以理解的,关于第一通信装置110包括的各个功能单元的具体实现可参考前述各个实施例,这里不再赘述。
参见图12,图12示出了本申请提供一种第二通信装置的结构框图。如图12所示,第二通信装置120可包括:接收单元1201和确定单元1202。
接收单元1201,用于接收秩指示RI和预编码矩阵指示PMI;
确定单元1202,用于根据所述PMI确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵满足W r=W 1×W 2,r,r∈{1,...,R};
所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
Figure PCTCN2018074496-appb-000217
所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
Figure PCTCN2018074496-appb-000218
上的K m,r个复系数
Figure PCTCN2018074496-appb-000219
所述V 2,r是由所述K m,r个元素位置和上述K m,r个复系数
Figure PCTCN2018074496-appb-000220
确定的,m∈{1,...,2L},i∈{1,...,K m,r};
其中,所述RI为非负整数,所述N、L、F、T、R和K m,r均为正整数,K m,r小于T,F小于等于T。
可选的,所述R≥2,针对所述第m行,所述位置索引信息指示一组位置
Figure PCTCN2018074496-appb-000221
所述一组位置
Figure PCTCN2018074496-appb-000222
用于指示所述R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的所述K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。
可选的,所述R≥1,所述位置索引信息指示R组位置,其中,所述R组位置中的第r组所述位置
Figure PCTCN2018074496-appb-000223
用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。
可选的,所述位置索引信息包括M m个参考位置的指示信息,所述M m个参考位置的指示信息用于指示所述一组位置
Figure PCTCN2018074496-appb-000224
M m为小于T的正整数。
可选的,所述位置索引信息包括M r个参考位置的指示信息,所述M r个参考位置的指示信息用于指示所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000225
M r为小于T的正整数。
可选的,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000226
X m,n为正整数;
或者,
与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
Figure PCTCN2018074496-appb-000227
X m,n为正整数。
可选的,所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000228
X r,n为正整数;
或者,
与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000229
X r,n为正整数。
可选的,当所述参考位置的个数G m,r>1时,所述位置索引信息包括所述G m,r个参考位置中一个第一参考位置的绝对位置信息,和所述G m,r个参考位置中除所述第一参考位置以外的其它G m,r-1个参考位置各自相对于所述第一参考位置的相对位置信息,其中,G m,r=M m,或者G m,r=M r
可选的,当G m,r=M m时,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素位置是根据所述G m个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
Figure PCTCN2018074496-appb-000230
或者,
当G m,r=M r时,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
Figure PCTCN2018074496-appb-000231
可选的,所述第一指示信息还包括所述V 2,r的|A|个第一元素位置τ r,m和一个第二元素位置γ r的指示信息,m∈A,所述集合A是集合{1,...,2L}的非空子集,|A|表示集合A中元素的个数,r∈{1,...,R};
Figure PCTCN2018074496-appb-000232
置;
所述第二指示信息包括所述K m,r个元素位置
Figure PCTCN2018074496-appb-000233
中除了所述第一元素位置 τ r,m之外的其它K m,r-1个元素位置上的全部或者部分系数
Figure PCTCN2018074496-appb-000234
与所述第一元素位置τ r,m上的系数
Figure PCTCN2018074496-appb-000235
的相对值,
以及,所述第二指示信息还包括所述|A|个第一元素位置τ r,m中,除了所述第二元素位置γ r之外的其它|A|-1个第一元素位置上的系数
Figure PCTCN2018074496-appb-000236
与所述第二元素位置γ r上的系数
Figure PCTCN2018074496-appb-000237
的相对值。
可选的,所述第一指示信息包括所述V 2,r的一个第三元素位置γ r,其中,所述γ r用于指示元素位置
Figure PCTCN2018074496-appb-000238
上,系数幅度
Figure PCTCN2018074496-appb-000239
最大的元素位置;
所述第二指示信息包括所有所述元素位置
Figure PCTCN2018074496-appb-000240
上除了所述第三元素位置γ r之外,其它元素位置上的全部或者部分系数与所述γ r位置上的系数的相对值,
Figure PCTCN2018074496-appb-000241
为通过对所有属于集合A的元素m对应的集合
Figure PCTCN2018074496-appb-000242
取并集得到的集合。
可选的,所述第二指示信息包括的所述系数的相对值中,至少存在两个相对值的量化比特数不同。
可选的,所述
Figure PCTCN2018074496-appb-000243
为N行2L列的矩阵,
Figure PCTCN2018074496-appb-000244
为N/2行L列的矩阵,
Figure PCTCN2018074496-appb-000245
属于向量集合B={b 0, b 1, ...... b M-1},所述PMI还包括第三指示信息,所述第三指示信息用于指示所述L个向量
Figure PCTCN2018074496-appb-000246
M为正整数,M大于等于L。
可选的,所述V 2,r=[V 2,r,1 ... V 2,r,T],其中,所述V 2,r中的第t列为V 2,r,t=[a r,1,t ... a r,2L,t] T,1≤t≤T,[ ] T表示转置。
可以理解的,关于第二通信装置120包括的各个功能单元的具体实现可参考前述各个实施例,这里不再赘述。
结合本发明实施例公开内容所描述的方法或者算法的步骤可以硬件的方式来实现,也可以是由处理器执行软件指令的方式来实现。软件指令可以由相应的软件模块组成,软件模块可以被存放于RAM、闪存、ROM、可擦除可编程只读存储器(Erasable Programmable ROM,EPROM)、电可擦可编程只读存储器(Electrically EPROM,EEPROM)、寄存器、硬盘、移动硬盘、只读光盘(CD-ROM)或者本领域熟知的任何其它形式的存储介质中。一种示例性的存储介质耦合至处理器,从而使处理器能够从该存储介质读取信息,且可向该存储介质写入信息。当然,存储介质也可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。另外,该ASIC可以位于收发机或中继设备中。当然,处理器和存储介质也可以作为分立组件存在于网络设备或终端设备中。
本领域技术人员应该可以意识到,在上述一个或多个示例中,本发明实施例所描述的功能可以用硬件、软件、固件或它们的任意组合来实现。当使用软件实现时,可以将这些功能存储在计算机可读介质中或者作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质,其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是通用或专用计算机能够存取的 任何可用介质。
以上的具体实施方式,对本发明实施例的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上仅为本发明实施例的具体实施方式而已,并不用于限定本发明实施例的保护范围,凡在本发明实施例的技术方案的基础之上,所做的任何修改、等同替换、改进等,均应包括在本发明实施例的保护范围之内。

Claims (31)

  1. 一种预编码矩阵索引上报方法,其特征在于,包括:
    第一通信装置确定秩指示RI和预编码矩阵指示PMI,所述PMI用于确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵W r满足W r=W 1×W 2,r,r∈{1,...,R};
    所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
    所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
    Figure PCTCN2018074496-appb-100001
    所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
    Figure PCTCN2018074496-appb-100002
    上的K m,r个复系数
    Figure PCTCN2018074496-appb-100003
    所述V 2,r是由所述K m,r个元素位置和所述K m,r个复系数
    Figure PCTCN2018074496-appb-100004
    确定的,m∈{1,...,2L},i∈{1,...,K m,r};
    其中,所述R为非负整数,所述N、L、F、T和K m,r均为正整数,K m,r小于T,F小于等于T;
    所述第一通信装置发送所述RI和所述PMI。
  2. 一种预编码矩阵索引上报方法,其特征在于,包括:
    第二通信装置接收秩指示RI和预编码矩阵指示PMI;
    所述第二通信装置根据所述PMI确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵W r满足W r=W 1×W 2,r,r∈{1,...,R};
    所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
    所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
    Figure PCTCN2018074496-appb-100005
    所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
    Figure PCTCN2018074496-appb-100006
    上的K m,r个复系数
    Figure PCTCN2018074496-appb-100007
    所述V 2,r是由所述K m,r个元素位置和上述K m,r个复系数
    Figure PCTCN2018074496-appb-100008
    确定的,m∈{1,...,2L},i∈{1,...,K m,r};
    其中,所述RI为非负整数,所述N、L、F、T、R和K m,r均为正整数,K m,r小于T,F小于等于T。
  3. 根据权利要求1或2所述的方法,其特征在于,所述R≥2,针对所述第m行,所述位置索引信息指示一组位置
    Figure PCTCN2018074496-appb-100009
    所述一组位置
    Figure PCTCN2018074496-appb-100010
    用于指示所述R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的所述K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。
  4. 根据权利要求1或2所述的方法,其特征在于,所述R≥1,所述位置索引信息指示R组位置,其中,所述R组位置中的第r组所述位置
    Figure PCTCN2018074496-appb-100011
    用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。
  5. 根据权利要求3所述的方法,其特征在于,所述位置索引信息包括M m个参考位置的指示信息,所述M m个参考位置的指示信息用于指示所述一组位置
    Figure PCTCN2018074496-appb-100012
    M m为小于T的正整数。
  6. 根据权利要求4所述的方法,其特征在于,所述位置索引信息包括M r个参考位置的指示信息,所述M r个参考位置的指示信息用于指示所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100013
    M r为小于T的正整数。
  7. 根据权利要求5所述的方法,其特征在于,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
    Figure PCTCN2018074496-appb-100014
    X m,n为正整数;
    或者,
    与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
    Figure PCTCN2018074496-appb-100015
    X m,n为正整数。
  8. 根据权利要求6所述的方法,其特征在于,
    所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100016
    X r,n为正整数;
    或者,
    与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100017
    X r,n为正整数。
  9. 根据权利要求5或6任意一项所述的方法,其特征在于,当所述参考位置的个数G m,r>1时,所述位置索引信息包括所述G m,r个参考位置中一个第一参考位置的绝对位置信息,和所述G m,r个参考位置中除所述第一参考位置以外的其它G m,r-1个参考位置各自相对于所述第一参考位置的相对位置信息,其中,G m,r=M m,或者G m,r=M r
  10. 根据权利要求9所述的方法,其特征在于,当G m,r=M m时,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素位置是根据所述G m个参考位置 中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
    Figure PCTCN2018074496-appb-100018
    或者,
    当G m,r=M r时,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100019
  11. 根据权利要求1至10任一项所述的方法,其特征在于,
    所述第一指示信息还包括所述V 2,r的|A|个第一元素位置τ r,m和一个第二元素位置γ r的指示信息,m∈A,所述集合A是集合{1,...,2L}的非空子集,|A|表示集合A中元素的个数,r∈{1,...,R};
    Figure PCTCN2018074496-appb-100020
    置;
    所述第二指示信息包括所述K m,r个元素位置
    Figure PCTCN2018074496-appb-100021
    中除了所述第一元素位置τ r,m之外的其它K m,r-1个元素位置上的全部或者部分系数
    Figure PCTCN2018074496-appb-100022
    与所述第一元素位置τ r,m上的系数
    Figure PCTCN2018074496-appb-100023
    的相对值,
    以及,所述第二指示信息还包括所述|A|个第一元素位置τ r,m中,除了所述第二元素位置γ r之外的其它|A|-1个第一元素位置上的全部或部分系数
    Figure PCTCN2018074496-appb-100024
    与所述第二元素位置γ r上的系数
    Figure PCTCN2018074496-appb-100025
    的相对值。
  12. 根据权利要求1至10任一项所述的方法,其特征在于,
    所述第一指示信息包括所述V 2,r的一个第三元素位置γ r,其中,所述γ r用于指示元素
    Figure PCTCN2018074496-appb-100026
    外,其它元素位置上的全部或者部分系数与所述γ r位置上的系数的相对值,
    Figure PCTCN2018074496-appb-100027
    为通过对所有属于集合A的元素m对应的集合
    Figure PCTCN2018074496-appb-100028
    取并集得到的集合。
  13. 根据权利要求11或12任一项所述的方法,其特征在于,
    所述第二指示信息包括的所述系数的相对值中,至少存在两个相对值的量化比特数不同。
  14. 根据权利要求1至13任一项所述的方法,其特征在于,所述
    Figure PCTCN2018074496-appb-100029
    为N行 2L列的矩阵,
    Figure PCTCN2018074496-appb-100030
    为N/2行L列的矩阵,
    Figure PCTCN2018074496-appb-100031
    (0≤i≤L-1)属于向量集合B={b 0,b 1,......b M-1},所述PMI还包括第三指示信息,所述第三指示信息用于指示所述L个向量
    Figure PCTCN2018074496-appb-100032
    M为正整数,M大于等于L。
  15. 根据权利要求1至14任一项所述的方法,其特征在于,所述V 2,r=[V 2,r,1 ... V 2,r,T],其中,所述V 2,r中的第t列为V 2,r,t=[a r,1,t ... a r,2L,t] T,1≤t≤T,[ ] T表示转置。
  16. 一种通信装置,其特征在于,包括:
    确定单元,用于确定秩指示RI和预编码矩阵指示PMI,所述PMI用于确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵满足W r=W 1×W 2,r,r∈{1,...,R};
    所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
    所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
    Figure PCTCN2018074496-appb-100033
    所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
    Figure PCTCN2018074496-appb-100034
    上的K m,r个复系数
    Figure PCTCN2018074496-appb-100035
    所述V 2,r是由所述K m,r个元素位置和所述K m,r个复系数
    Figure PCTCN2018074496-appb-100036
    确定的,m∈{1,...,2L},i∈{1,...,K m,r};
    其中,所述RI为非负整数,所述N、L、F、T和K m,r均为正整数,K m,r小于T,F小于等于T;
    发送单元,用于发送所述RI和所述PMI。
  17. 一种通信装置,其特征在于,包括:
    接收单元,用于接收秩指示RI和预编码矩阵指示PMI;
    确定单元,用于根据所述PMI确定R个预编码矩阵W 1,…,W R,其中,所述R个预编码矩阵中的第r个预编码矩阵满足W r=W 1×W 2,r,r∈{1,...,R};
    所述W 1是N行2L列的矩阵,所述W 2,r是2L行F列的矩阵,所述W 2,r的第l行是由矩阵V 2,r的第l行做DFT变换得到的,所述V 2,r是2L行T列的矩阵,所述R是由所述RI指示的,l∈{1,...,2L};
    所述PMI包括第一指示信息和第二指示信息,所述第一指示信息包括位置索引信息,所述位置索引信息用于指示所述V 2,r的第m行的K m,r个元素位置
    Figure PCTCN2018074496-appb-100037
    所述第二指示信息用于指示所述V 2,r的第m行中在所述元素位置
    Figure PCTCN2018074496-appb-100038
    上的K m,r个复系数
    Figure PCTCN2018074496-appb-100039
    所述V 2,r是由所述K m,r个元素位置和上述K m,r个复系数
    Figure PCTCN2018074496-appb-100040
    确定的,m∈{1,...,2L},i∈{1,...,K m,r};
    其中,所述RI为非负整数,所述N、L、F、T、R和K m,r均为正整数,K m,r小于T,F 小于等于T。
  18. 根据权利要求16或17所述的通信装置,所述R≥2,针对所述第m行,所述位置索引信息指示一组位置
    Figure PCTCN2018074496-appb-100041
    所述一组位置
    Figure PCTCN2018074496-appb-100042
    用于指示所述R个矩阵V 2,1,…,V 2,R中每个矩阵的第m行的所述K m,r个元素位置,即t r,m,i=c m,i和K m,r=K m,其中,m∈{1,...,2L},i∈{1,...,K m}。
  19. 根据权利要求16或17所述的通信装置,其特征在于,所述R≥1,所述位置索引信息指示R组位置,其中,所述R组位置中的第r组所述位置
    Figure PCTCN2018074496-appb-100043
    用于指示所述V 2,r中至少两行的所述K m,r个元素位置,即存在n∈{1,...,2L},m∈{1,...,2L},n≠m,满足t r,m,i=t r,n,i=c r,i和K m,r=K n,r=K r,i∈{1,...,K r},r∈{1,...,R}。
  20. 根据权利要求18所述的通信装置,其特征在于,所述位置索引信息包括M m个参考位置的指示信息,所述M m个参考位置的指示信息用于指示所述一组位置
    Figure PCTCN2018074496-appb-100044
    M m为小于T的正整数。
  21. 根据权利要求19所述的通信装置,其特征在于,所述位置索引信息包括M r个参考位置的指示信息,所述M r个参考位置的指示信息用于指示所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100045
    M r为小于T的正整数。
  22. 根据权利要求20所述的通信装置,其特征在于,针对所述第m行,所述位置索引信息还包括与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
    Figure PCTCN2018074496-appb-100046
    X m,n为正整数;
    或者,
    与所述M m个参考位置中第n(n=1,…,M m)个参考位置相关联的窗口尺寸X m,n是由第一配置信息配置的,所述M m个参考位置和所述M m个窗口尺寸用于确定所述一组位置
    Figure PCTCN2018074496-appb-100047
    X m,n为正整数。
  23. 根据权利要求21所述的通信装置,其特征在于,所述位置索引信息还包括与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100048
    X r,n为正整数;
    或者,
    与所述M r个参考位置中第n(n=1,…,M r)个参考位置相关联的窗口尺寸X r,n是由第一配置信息配置的,所述M r个参考位置和所述M r个窗口尺寸用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100049
    X r,n为正整数。
  24. 根据权利要求20或21所述的通信装置,其特征在于,当所述参考位置的个数G m,r>1 时,所述位置索引信息包括所述G m,r个参考位置中一个第一参考位置的绝对位置信息,和所述G m,r个参考位置中除所述第一参考位置以外的其它G m,r-1个参考位置各自相对于所述第一参考位置的相对位置信息,其中,G m,r=M m,或者G m,r=M r
  25. 根据权利要求24所述的通信装置,其特征在于,当G m,r=M m时,所述位置索引信息还包括G m组第四指示信息,其中,第n(1≤n≤G m)组第四指示信息用于指示从Y m,n个元素位置中选择的Z m,n个元素位置,其中,所述Y m,n个元素位置是根据所述G m个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X m,n确定的,Z m,n是小于等于Y m,n的正整数,所述G m个参考位置、所述G m个窗口尺寸和所述G m个第四指示信息用于确定所述一组位置
    Figure PCTCN2018074496-appb-100050
    或者,
    当G m,r=M r时,所述位置索引信息还包括G r组第四指示信息,其中,第n(1≤n≤G r)组第四指示信息用于指示从Y r,n个元素位置中选择的Z r,n个元素位置,其中,所述Y r,n个元素位置是根据所述G r个参考位置中第n个参考位置以及与所述第n个参考位置相关联的的窗口尺寸X r,n确定的,Z r,n是小于等于Y r,n的正整数,所述G r个参考位置、所述G r个窗口尺寸和所述G r个第四指示信息用于确定所述R组位置中的第r组位置
    Figure PCTCN2018074496-appb-100051
  26. 根据权利要求16至25任一项所述的通信装置,其特征在于,
    所述第一指示信息还包括所述V 2,r的|A|个第一元素位置τ r,m和一个第二元素位置γ r的指示信息,m∈A,所述集合A是集合{1,...,2L}的非空子集,|A|表示集合A中元素的个数,r∈{1,...,R};
    Figure PCTCN2018074496-appb-100052
    置;
    所述第二指示信息包括所述K m,r个元素位置
    Figure PCTCN2018074496-appb-100053
    中除了所述第一元素位置τ r,m之外的其它K m,r-1个元素位置上的全部或者部分系数
    Figure PCTCN2018074496-appb-100054
    与所述第一元素位置τ r,m上的系数
    Figure PCTCN2018074496-appb-100055
    的相对值,
    以及,所述第二指示信息还包括所述|A|个第一元素位置τ r,m中,除了所述第二元素位置γ r之外的其它|A|-1个第一元素位置上的系数
    Figure PCTCN2018074496-appb-100056
    与所述第二元素位置γ r上的系数
    Figure PCTCN2018074496-appb-100057
    的相对值。
  27. 根据权利要求16至25任一项所述的通信装置,其特征在于,
    所述第一指示信息包括所述V 2,r的一个第三元素位置γ r,其中,所述γ r用于指示元素
    Figure PCTCN2018074496-appb-100058
    γ r之外,其它元素位置上的全部或者部分系数与所述γ r位置上的系数的相对值,
    Figure PCTCN2018074496-appb-100059
    为通过对所有属于集合A的元素m对应的集合
    Figure PCTCN2018074496-appb-100060
    取并集得到的集合。
  28. 根据权利要求26或27任一项所述的通信装置,其特征在于,
    所述第二指示信息包括的所述系数的相对值中,至少存在两个相对值的量化比特数不同。
  29. 根据权利要求16或28任一项所述的通信装置,其特征在于,所述
    Figure PCTCN2018074496-appb-100061
    为N行2L列的矩阵,
    Figure PCTCN2018074496-appb-100062
    为N/2行L列的矩阵,
    Figure PCTCN2018074496-appb-100063
    (0≤i≤L-1)属于向量集合B={b 0,b 1,......b M-1},所述PMI还包括第三指示信息,所述第三指示信息用于指示所述L个向量
    Figure PCTCN2018074496-appb-100064
    M为正整数,M大于等于L。
  30. 根据权利要求16或29任一项所述的通信装置,其特征在于,所述V 2,r=[V 2,r,1 ... V 2,r,T],其中,所述V 2,r中的第t列为V 2,r,t=[a r,1,t ... a r,2L,t] T,1≤t≤T,[ ] T表示转置。
  31. 一种计算机存储介质,其特征在于,所述计算机存储介质存储有指令,当所述指令被处理器执行时,实现权利要求1至15任一项所述的预编码矩阵索引上报方法。
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