WO2014179991A1 - 确定预编码矩阵指示的方法、用户设备和基站 - Google Patents
确定预编码矩阵指示的方法、用户设备和基站 Download PDFInfo
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- WO2014179991A1 WO2014179991A1 PCT/CN2013/075488 CN2013075488W WO2014179991A1 WO 2014179991 A1 WO2014179991 A1 WO 2014179991A1 CN 2013075488 W CN2013075488 W CN 2013075488W WO 2014179991 A1 WO2014179991 A1 WO 2014179991A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- Embodiments of the present invention relate to the field of wireless communications, and more particularly, to a method, user equipment, and base station for determining a precoding matrix indication. Background technique
- BF Beam Forming
- MIMO Multiple Input Multiple Output
- Optimal precoding usually requires the transmitter to be fully aware of CSI (Channel State Information).
- CSI Channel State Information
- a common method is that the user equipment quantizes the instantaneous CSI and feeds it back to the base station.
- the CSI information fed back by the existing LTE R8 system includes an RI ( Rank Indicator, a PMK Precoding Matrix Indicator, a Precoding Matrix Indicator), and a CQI (Channel Quality Indicator), where the RI and the PMI respectively indicate the use.
- RI Rank Indicator
- PMK Precoding Matrix Indicator a Precoding Matrix Indicator
- CQI Channel Quality Indicator
- the set of precoding matrices used is often referred to as a codebook (sometimes each of the precoding matrices is a codeword).
- the existing LTE (Long Term Evolution) R8 4 antenna codebook is based on the Househoulder transform design, and the R10 system introduces a dual-codebook design for the 8-day line.
- the above two codebooks are mainly for the antenna design of a conventional base station.
- Conventional base stations use a fixed or remote ESC downtilt to control the direction of the vertical antenna beam. Only the horizontal direction can dynamically adjust its beam direction by precoding or beamforming.
- AAS Active Antenna Systems
- LTE R12 Low-power Bluetooth
- AAS Advanced Antenna Systems
- LTE R12 Low-power Bluetooth
- AAS further provides design freedom in the vertical direction compared to conventional base station antennas.
- the introduction of the vertical direction of freedom can be used for cell splitting, and can also be used to implement three-dimensional beamforming (3D-BF).
- 3D-BF three-dimensional beamforming
- the above technologies propose new requirements in terms of air traffic such as signaling support, codebook design, and feedback support.
- a new design scheme is needed for how to obtain the cell split gain and improve the system throughput performance by using the codebook and feedback design. Summary of the invention
- the embodiment of the invention provides a method for determining a precoding matrix indication, a user equipment and a base station, which can improve the transmission performance of the active antenna system.
- a method for determining a precoding matrix indication including: receiving a first reference signal set sent by a base station; determining one or more intermediate matrices based on the first reference signal set, and reporting to the base station And indicating a first index of the intermediate matrix; receiving a second reference signal set sent by the base station; determining a precoding matrix based on the second reference signal set, and reporting to the base station to indicate the pre A precoding matrix of the coding matrix, wherein the precoding matrix is a product of two matrices ⁇ and w 2 , where n is a block diagonalization matrix W!
- ⁇ X 1 , X 2 ⁇ , a block matrix X is the matrix of two matrices C ; and D ;
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of antenna ports arranged in the same direction in the antenna array, Or corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices are each a discrete Fourier transform DFT vector or a Hadamard
- a matrix A of a Hadamard matrix or a column vector of a Hausschild Household matrix, the matrix C ; or a matrix D ; is a function of the intermediate matrix A.
- the one or more intermediate matrices are two matrices A and B each of which is a column vector of a DFT vector or a Hadamard matrix. , the matrix. ; and matrix 1) ; is a function of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or There is a mapping relationship with the cell identity.
- a method for determining a precoding matrix indication including: sending a first reference signal set to a user equipment; receiving a first index reported by the user equipment, where the first index is used to indicate the user Receiving, by the device, one or more intermediate matrices determined by the first reference signal set; sending a second reference signal set to the user equipment; receiving a precoding matrix indication reported by the user equipment, where the precoding matrix indication is used to indicate Determining, by the user equipment, a precoding matrix determined based on the second reference signal set, where the precoding matrix is a product of two matrices ⁇ and w 2 ,
- the first reference signal set corresponds to a subset of co-polarized antenna ports, or to antenna elements arranged in the same direction in the antenna array, or Corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices indicated by the first index are each a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or
- the matrix vector of the Hauserdold Householder matrix consists of a matrix A, the matrix. ; Or a matrix); A is a function of the intermediate matrix.
- the one or more intermediate matrices indicated by the first index are two column vectors that are DFT vectors or Hadamard matrices.
- the matrices A and B, the matrix C ; and the matrix D ; are functions of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or with the cell identifier There is a mapping relationship between them.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of antenna ports arranged in the same direction in the antenna array, Or corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices are each a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or Haushold A matrix A composed of column vectors of the Householder matrix, the matrix C ; or a matrix D ; is a function of the intermediate matrix A.
- the one or more intermediate matrices are two matrices A and B each of which is a column vector of a DFT vector or a Hadamard matrix. , the matrix. ; and matrix 1) ; is a function of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or with the cell identifier There is a mapping relationship between them.
- a base station including: a sending unit, configured to send a first reference signal set to a user equipment, and a receiving unit, configured to receive a first index reported by the user equipment, where An index is used to indicate one or more intermediate matrices determined by the user equipment based on the first reference signal set; the sending unit is further configured to send a second reference signal set to the user equipment; And a precoding matrix indication, where the precoding matrix is used to instruct the user equipment to determine a precoding matrix based on the second reference signal set, where the precoding matrix is two
- the first reference signal set corresponds to a subset of co-polarized antenna ports, or to antenna elements arranged in the same direction in the antenna array, or Corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices indicated by the first index are each a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or
- the matrix vector of the Hauserdold Householder matrix consists of a matrix A, the matrix. ; Or a matrix); A is a function of the intermediate matrix.
- the one or more intermediate matrices indicated by the first index are two DFT vectors or
- the matrixes A and B of the column vectors of the Hadamard matrix, the matrix C ; and the matrix D ; are functions of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or with the cell identifier There is a mapping relationship between them.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of antenna ports arranged in the same direction in the antenna array, Or corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices are each a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or Haushold A matrix A composed of column vectors of the Householder matrix, the matrix C ; or a matrix D ; is a function of the intermediate matrix A.
- the one or more intermediate matrices are two matrices A and B each of which is a column vector of a DFT vector or a Hadamard matrix. , the matrix. ; and matrix 1) ; is a function of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or with the cell identifier There is a mapping relationship between them.
- a base station including: a transmitter, configured to send a first reference signal set to a user equipment, and a receiver, configured to receive a first index reported by the user equipment, where the first cable Referring to one or more intermediate matrices that are determined by the user equipment based on the first reference signal set; the transmitter is further configured to send a second reference signal set to the user equipment; the receiver is further configured to: Receiving, by the user equipment, a precoding matrix indication, where the precoding matrix is used to indicate a precoding matrix determined by the user equipment based on the second reference signal set, where the precoding matrix is two matrices ⁇ !
- the first reference signal set corresponds to a subset of the same-polarized antenna ports, or to antenna elements arranged in the same direction in the antenna array, or Corresponds to a subset of antenna ports for quasi co-location.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with a cell identifier.
- the one or more intermediate matrices indicated by the first index are each a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or
- the matrix vector of the Hauserdold Householder matrix consists of a matrix A, the matrix. ; Or a matrix); A is a function of the intermediate matrix.
- the one or more intermediate matrices indicated by the first index are two column vectors that are DFT vectors or Hadamard matrices.
- the matrices A and B, the matrix C ; and the matrix D ; are functions of the intermediate matrices A and B.
- the subset of the set formed by the matrix A or the matrix A is associated with a cell identifier or has a mapping with a cell identifier. relationship.
- the subset of the set of the matrix eight and eight or the matrix eight and eight is associated with the cell identifier or with the cell identifier There is a mapping relationship between them.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam. Due to the difference in location, the user equipment feeds back different intermediate matrices, ie beams or beam groups. Therefore, the base station is based on the feedback of the user equipment.
- the matrix can be used to know the beam or beam group in which the user equipment is located, so that the dynamic or semi-static scheduling of the beam can be used to avoid interference caused by cell splitting of multiple beams in different beams; the user equipment according to the second reference signal determining a set of precoding matrix, wherein the matrix C in the pre-coding matrix structure; or a matrix 1); as a function of the intermediate matrix, user equipment is further optimized precoding based on which the beam or beam group.
- the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- FIG. 1 is a flow chart of a method of determining a precoding matrix in accordance with an embodiment of the present invention.
- FIG. 2 is a flow chart of a method of determining a precoding matrix according to another embodiment of the present invention.
- FIG. 3 is a schematic flow chart of a multi-antenna transmission method according to an embodiment of the present invention.
- FIG. 4 is a schematic flow chart of a multi-antenna transmission method according to an embodiment of another embodiment of the present invention.
- Figure 5 is a block diagram of a user equipment in accordance with one embodiment of the present invention.
- FIG. 6 is a block diagram of a base station in accordance with one embodiment of the present invention.
- FIG. 7 is a block diagram of a user equipment according to another embodiment of the present invention.
- FIG. 8 is a block diagram of a base station in accordance with another embodiment of the present invention. detailed description
- GSM Global System of Mobile Communication
- CDMA Code Division Multiple Access
- WCDMA Wideband Code Division Multiple Access
- GPRS General Packet Radio Service
- LTE Long Term Evolution
- a user equipment which may also be called a mobile terminal (Mobile Terminal), a mobile user equipment, etc., may communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network).
- the user equipment may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, a mobile device that can be portable, pocket-sized, handheld, built-in or on-board, user equipment It can also be a relay that exchanges language and/or data with the radio access network.
- the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station (eNB or e-NodeB, evolutional Node B) in LTE or Relay, the present invention is not limited.
- BTS Base Transceiver Station
- NodeB base station
- eNB evolved base station
- e-NodeB evolutional Node B
- the conventional cell splitting technique forms a plurality of independent cells by forming a plurality of beams in a horizontal or vertical direction, and directly reuses an existing single cell air interface protocol for communication in an independent cell.
- This method cannot fully exploit the resolution of the vertical space, and thus cannot provide better interference management.
- the interference between the paired UEs in the MU-MIMO transmission cannot be more effectively suppressed, thereby affecting the further system capacity. Upgrade.
- this scheme splits each cell into multiple cells, which will further cause mobility problems such as more frequent cell handover and will further cause interference management problems such as inter-cell interference, which will be further increased, especially between the above-mentioned internal and external cells. Interference.
- FIG. 1 is a flow chart of a method of determining a precoding matrix indication in accordance with an embodiment of the present invention.
- the method of Figure 1 is performed by a user equipment (e.g., a UE).
- a user equipment e.g., a UE
- ® denotes the kronecker product of two matrices
- diag ⁇ ⁇ denotes a matrix of elements in " ⁇ ⁇ " as diagonal elements, where the elements can be matrices or scalars as real numbers Or plural.
- the matrix may be used for the vertical direction, a matrix); for the horizontal direction; Alternatively, the matrix 1); a horizontal direction, the matrix C; for the vertical direction.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the UE is located according to the intermediate matrix fed back by the user equipment, so that the dynamic or half of the beam can be passed.
- static scheduling to avoid interference between the various users in different beams due multibeam cell formed due to division
- the user equipment determines the precoding matrix according to a second set of reference signals, wherein the precoding matrix or a matrix structure of matrix D; intermediate
- the function of the matrix facilitates the user equipment to further optimize the precoding based on the beam or beam set in which it is located. In this way, the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of the antenna ports arranged in the same direction in the antenna port array, or corresponds to a quasi co-location (Quasi- A subset of antenna ports for Co-Location, the cartridge is called QCL.
- QCL quasi co-location
- the quasi-coordinated antenna port means that the spacing between the antennas corresponding to the antenna ports is within a range of wavelengths.
- the second reference signal set may include one or more reference signal subsets.
- the subset of reference signals may correspond to a subset of co-polarized antenna ports, or to a subset of antenna ports aligned in the same direction in the array of antenna ports, or to a subset of antenna ports that are quasi-co-located.
- one reference signal corresponds to one antenna port;
- one antenna port may correspond to one physical antenna or may correspond to one virtual antenna, where the virtual antenna is a weighted combination of multiple physical antennas.
- the first reference signal set may be a sub-option of the second reference signal set.
- the first reference signal set may be associated with the cell identifier.
- ⁇ ⁇ , ⁇ 2 ⁇ ⁇ ⁇ and ⁇ , ⁇ 1, ⁇ ⁇ ⁇ are real numbers, such ⁇ 3 ⁇ 4,, 2, or
- N is a positive integer
- ⁇ is a phase shift, such as ⁇ ⁇ .
- N D is a positive integer
- & offset is a phase shift, such as Shi, Shi, Shi, etc.
- phase shifts ⁇ and ⁇ . ⁇ is not limited to the above values, not listed here.
- the intermediate matrix is a matrix A composed of a column vector of a discrete Fourier transform (DFT) vector or a Hadamard matrix or a Householder matrix.
- DFT discrete Fourier transform
- the matrix or matrix 1 ⁇ . is a function of the intermediate matrix A.
- e " ⁇ e (12) where [] T is a matrix transposition, M, N are positive integers, and N C ⁇ N or N D ⁇ N,
- the vector has a spatial granularity as shown by the formula (4), (6) - (8) or as described in the formulas (5), (9) - (11) having a finer than a.
- the matrix C, and the matrix D are functions of the one or more intermediate matrices, including:
- d, diag ⁇ A, ,... ⁇ b garbage (14)
- a m and b garbage are the mth column vector of the intermediate matrix A and the nth column vector of the intermediate matrix B, respectively
- ⁇ is positive Integer
- , , ⁇ , ⁇ and ⁇ , ⁇ , ..., ⁇ are all phases.
- a k ⁇ a k , '', a k , Nv and ⁇ , ⁇ are real numbers, such as ⁇ , or m H is a symmetry sequence, ie or
- ⁇ ⁇ , ⁇ ⁇ ... or ..., or ⁇ , ,..., ⁇ are all i.
- phase, , ⁇ , ⁇ is satisfied
- N c is a positive integer
- ⁇ is a phase shift, such as ⁇ , Shi, Shi, etc. or
- N D is a positive integer
- ⁇ is a phase shift, such as Shi, Shi, Shi, etc.
- the phase port and the phase shift are not limited to the above values, and are not enumerated here.
- the intermediate matrix is a matrix A and B composed of two column vectors of a column vector of a DFT vector or a Hadamard matrix or a Household matrix.
- Matrix C, or matrix D is a function of the intermediate matrices A and B.
- N, M, and N are positive integers, and N C ⁇ N or N D ⁇ N', where the vectors of equations (13) (15) - (17) have a finer space than a.
- the granularity or the vector described in equations (14) (18) - (20) has a finer spatial granularity than b reservation.
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier.
- the association or mapping relationship is predefined or notified to the user equipment by the base station.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier.
- the association or mapping relationship is predefined or notified to the user equipment by the base station.
- the user equipment of the embodiment of the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving The performance of the system in the above antenna configuration, in particular the AAS base station antenna configuration.
- FIG. 2 is a flow chart of a method of determining a precoding matrix indication according to another embodiment of the present invention.
- the method of Figure 2 is performed by a base station (e.g., an eNB).
- a base station e.g., an eNB
- the base station in the embodiment of the present invention transmits two reference signal sets, and the user equipment determines a precoding matrix according to two reference signal sets, where the precoding matrix is a product of two matrices ⁇ and ⁇ 2 , and the matrix ⁇ matrix D,
- the kronecker product, the matrix C, or the matrix D is a function of the intermediate matrix, and the block matrix of the kronecker product form in the precoding matrix structure can be realized by the matrix C and the matrix D, respectively, in the vertical and horizontal directions.
- Precoding so that the horizontal and vertical degrees of freedom of the base station antenna can be fully utilized to improve the transmission performance of the active antenna system.
- the UE determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam respectively.
- the UE feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the UE is located according to the intermediate matrix fed back by the UE, so that the beam can be dynamically or semi-static. Scheduling to avoid interference caused by cell splitting between multiple users in different beams due to multi-beam formation.
- the matrix C is a function of the one or more intermediate matrices, which is convenient
- the UE further optimizes the precoding based on the beam or beam set in which it is located.
- the precoding matrix based on the intermediate matrix can not only obtain the cell splitting gain, but also further improve the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of antenna ports arranged in the same direction in the antenna array, or corresponds to a quasi-co-located antenna port. set.
- the second reference signal set may include one or more reference signal subsets.
- the subset of reference signals may correspond to a subset of co-polarized antenna ports, or to a subset of antenna ports aligned in the same direction in the array of antenna ports, or to a subset of antenna ports that are quasi-co-located.
- the first reference signal set may be a subset of the second reference signal set.
- the first reference signal set may be associated with a cell identifier.
- the matrix C, or the matrix D is a function of the one or more intermediate matrices, including:
- the first column of the matrix C satisfying the formula (4) or the matrix D, satisfies the formula (5) where a ⁇ w', ⁇ are real numbers, such as ⁇ , ⁇ , ..., ⁇ or
- phase, 2 , . . . , ⁇ satisfies the formula (6) or (7) and (8); or the phase 3 ⁇ 4 , % , 2 , ..., ⁇ satisfies (9) or ⁇ (10) and (11).
- the phase shift ⁇ ⁇ can be taken as ⁇ , ⁇ , etc. Phase ⁇ ,..., ⁇ and ⁇ , ⁇ ,... ⁇ and phase shift ⁇ , and
- 3 ⁇ 4 is not limited to the above values, not here - enumerated.
- the intermediate matrix is each column is a discrete Fourier transform
- the matrix C, or matrix D, in step 304 is a function of the intermediate matrix A, including the columns of the intermediate matrix A as shown in (12), and wherein N C ⁇ N or N D ⁇ N, at which time the vector c A is as shown in the formula (4), (6) - (8) or the ratio (a), (9) - (11) has a ratio a, More fine spatial granularity.
- the matrix C, and the matrix D are functions of the one or more intermediate matrices, including:
- a kA , ak ' 2 , -, ak , Nv and , NH are real numbers , for example, a kA , ak ' 2 , -, ak , Nv or m is a symmetry sequence, ie ⁇ 2,... or The value is 1.
- phase , , ..., ⁇ satisfies the equations (15) or (16) and (17); or the phase satisfies (18) or (19) and (20).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as the value of Shi, Shi, etc.
- the phases ⁇ ,..., ⁇ and ⁇ , ⁇ ..., ⁇ and the phase shifts ⁇ and 3 ⁇ 4 ⁇ are not limited to the above values, and are not listed here.
- the intermediate matrix is a matrix A and B composed of two column vectors each having a DFT vector or a Hadamard matrix, and the matrix C, or the matrix D, is the intermediate matrix A. And the function of B.
- the matrix C, or matrix D, in step 304 is a function of the intermediate matrices A and B, and the columns including the intermediate matrices A and B are as shown in (21) (22), And wherein N C ⁇ N or N D ⁇ N
- the vector c A has a finer spatial granularity than the a, as shown by the formula (13) (15) - (17) or the d, as in the formula ( 14) (18) - (20) have a finer spatial granularity than 13 hail.
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier.
- the association or mapping relationship is predefined or notified to the user equipment by the base station.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier.
- the association or mapping relationship is predefined or notified to the user equipment by the base station.
- the base station of the embodiment of the present invention transmits two reference signal sets, and the UE determines and indicates an intermediate matrix according to the first reference signal set, and the base station can determine a suitable beam according to the information, thereby avoiding the splitting of each user in different beams due to cell splitting. Interference; the UE determines a precoding matrix according to the second reference signal set, where the precoding matrix is a product of two matrices ⁇ and ⁇ 2 , and the matrix ⁇ is a sub
- the kronecker product of D, the matrix C, or the matrix D is a function of the intermediate matrix, and the structure of the precoding matrix can fully utilize the horizontal and vertical degrees of freedom of the AAS base station antenna, and at the same time, the matrix C Or the matrix D is a function of the intermediate matrix, so that the PMI can be further improved based on the intermediate matrix feedback precoding matrix indicating PMI, thereby improving the transmission performance of the active antenna system.
- the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving the performance of the system in the antenna configuration, in particular, the AAS base station antenna configuration.
- reporting one or more indexes based on the subset to indicate the precoding matrix will fully utilize the time/frequency domain/space correlation of the channel, thereby reducing the overhead of feedback.
- Embodiments of the present invention are described in more detail below with reference to specific examples.
- the eNB is used as an example of the base station
- the UE is used as an example of the user equipment.
- the embodiment of the present invention is not limited thereto, and the same can be applied to other communication systems.
- FIG. 3 is a schematic flow chart of a multi-antenna transmission method according to an embodiment of the present invention.
- the embodiment of Figure 3 is a scenario in which an intermediate matrix is indicated for the first index.
- the matrix matrix ( ⁇ . or matrix 1) in the precoding matrix is a function of the one intermediate matrix.
- the matrix C, or matrix D can be used for precoding in the horizontal or vertical direction.
- the UE receives the first reference signal set.
- the first reference signal set received by the UE is notified by the eNB through high layer signaling or dynamically notified by using a downlink control channel; or
- the first reference signal set received by the UE is a subset of the reference signal set notified by the eNB.
- the reference signal set notified by the eNB is S, where a total of eight reference signals are respectively included, respectively, sl, s2, s3, .. .,s7,s8.
- the reference signal set received by the UE may include reference signals of four reference signals in S, such as ⁇ sl, s2, s3, s4 ⁇ or ⁇ s5, s6, s7, s8 ⁇ .
- the first reference signal set is a subset of the reference signal set notified by the eNB, and may correspond to a subset of the same polarized antenna ports, for example, the first reference signal set ⁇ sl, s2, s3, s4 as described above. ⁇ corresponds to a set of co-polarized antenna ports; or the first reference signal set ⁇ s5, s6, s7, s8 ⁇ as described above corresponds to another set of co-polarized antenna ports.
- the first reference signal set is a subset of the reference signal set notified by the eNB, and may correspond to a subset of the antenna ports corresponding to the same direction in the antenna array, for example: the first reference signal set ⁇ sl, s2, as described above, S3, s4 ⁇ corresponds to a subset of antenna ports in the same column in the vertical direction of the antenna port array; or the first reference signal set ⁇ s5, s6, s7, s8 ⁇ as described above corresponds to the antenna in the same row in the horizontal direction of the antenna array Port subset.
- the first reference signal set is a subset of the reference signal set notified by the eNB, and may correspond to a subset of the quasi-co-located antenna ports, for example: the first reference signal set ⁇ sl, s2, s3, s4 ⁇ as described above Corresponding antenna port subset quasi-co-location, such as half-wavelength or 4 wavelengths; or The first reference signal set ⁇ s5, s6, s7, s8 ⁇ corresponds to the antenna port subset quasi-co-location, such as the mutual spacing is half wavelength or 4 wavelengths.
- the above subset of reference signals can further reduce the complexity of implementation.
- the reference signal set may be associated with a cell identity.
- the reference signal set notified by the eNB is S, where a total of eight reference signals are included, which are Sl, s2, s3, ..., s7, s8.
- the reference signal is associated with the cell identifier ID0; or the reference signal set received by the UE may be divided into two or more subsets, where the subsets are respectively associated with a specific cell identifier, for example, the reference signal set received by the UE may be divided into
- the two subsets respectively contain reference signals ⁇ sl, s2, s3, s4 ⁇ or ⁇ s5, s6, s7, s8 ⁇ , then ⁇ sl, s2, s3, s4 ⁇ are associated with cell identifiers ID1 and ID2.
- the association or mapping relationship between the foregoing reference signal set and the cell identifier may be predefined or may be notified by the eNB.
- the reference signal set/subset is associated with or mapped to the cell identifier, which facilitates cell splitting or cell identification.
- the above cell identity is not necessarily a specific communication protocol such as a cell ID in LTE, but it may also be a specific parameter for distinguishing cell attributes, such as an index or offset in a certain cell group.
- the reference signal may be a CRS (Cell-specific Reference Signal) or a CSI-RS or other reference signal.
- CRS Cell-specific Reference Signal
- CSI-RS Cell-specific Reference Signal
- the UE determines one or more intermediate matrices based on the received first reference signal set, and reports, to the base station, a first index used to indicate the intermediate matrix.
- the intermediate matrix may be a matrix A composed of column vectors of DFT vectors or Hadamard matrices, that is,
- N a ⁇ 1 is the number of columns of the matrix A
- N h ⁇ 1 and N f ⁇ 1 are the number of columns of the Hadamard matrix and the number of columns of the DFT vector, respectively.
- the matrix A may also adopt other forms of matrix, such as a Householder matrix or a 4-antenna in LTE R8 or a precoding matrix in an 8-antenna codebook in LTE R10.
- the set of candidate matrices A is c A , where each matrix can be indicated by one or more indices.
- the set of the foregoing intermediate matrix is C A , and may be further divided into multiple subsets, where each subset may be associated with a specific cell identifier or have a mapping relationship.
- the subset C) in C A is associated or mapped to the cell identity ID1
- another subset C 2 in C A is associated or mapped to the cell identity ID2.
- the subset and C may have an intersection, or there may be no intersection.
- the set of first indexes used to indicate each matrix may also be divided into a plurality of subsets, wherein each subset may be associated with a specific cell identifier or have a mapping relationship.
- the first index used to indicate the matrix in the subset is mapped or mapped to the cell identifier ID1, and is used to indicate that the first index of the matrix in the subset C is associated with or mapped to the cell identifier ID2.
- the association or mapping relationship between the subset of the foregoing matrix or the subset of the first index and the cell identifier may be predefined, or may be notified by the eNB to the UE, such as by using high layer signaling, such as RRC signaling or downlink control channel notification. .
- Each of the above subsets may contain only one element.
- the above cell identifier is not necessarily a specific communication protocol such as a cell ID in LTE, and it may also be a specific parameter for distinguishing cell attributes, such as an index or an offset in a certain cell group.
- the association or mapping relationship between the subset of the foregoing matrix or the subset of the first index and the cell identifier may implement cell splitting or cell identification.
- the UE may obtain a corresponding channel matrix by channel estimation based on the received first reference signal set.
- the optimal matrix A can be selected, wherein the matrix A can be used as precoding The matrix is used.
- the first index may include one or more index values.
- the first index corresponding to the optimal matrix A can be fed back through high-level signaling, or A Physical Uplink Control Channel (PUC) or a Physical Uplink Shared Channel (PUSCH) is fed back to the eNB.
- PUC Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- the corresponding metric value may be additionally reported, for example: SINR or CQI or received power.
- the UE receives a second reference signal set, where the second reference signal set may include one or more reference signal subsets.
- the UE receives the second reference signal set as P, and includes a total of eight reference signals, which are respectively pi, p2, p3, . . . , p7, p8.
- the second reference signal set may include a reference signal subset, wherein the reference signal subset is the same as the second reference signal set; that is, 8 reference signals pl, p2, ..., s8 in P;
- the reference signal in the plurality of reference signal subsets included in the second reference signal set may occupy different symbol/frequency/sequence resources to be transmitted in the same subframe, or occupy the same symbol.
- the number/frequency/sequence resources are transmitted in different subframes.
- the division of the above subset of reference signals can further reduce the complexity of implementation.
- the second reference signal set may comprise a first reference signal set, ie the first reference signal set is a subset of the second reference signal set, eg the second reference signal set P as described above comprises two reference signals Subsets P1 and P2, the first reference signal set may be a subset of P1 or P2 or P1 or a subset of P2.
- the above reference signal may be a CRS or a CSI-RS or other reference signal.
- the UE determines a precoding matrix based on the second reference signal set, and reports, to the base station, a precoding matrix indication for indicating the precoding matrix.
- the matrix C, or the matrix D is a function of the one intermediate matrix, including a column of the matrix C, (the equation (4) or the matrix D, satisfies the equation (5) a w', ⁇ are real numbers, such as ⁇ , ⁇ ,..., or ⁇ - ⁇ ⁇ ⁇ are respectively a symmetry sequence, ie ⁇ ⁇ ⁇ ⁇ ... or
- phase, ⁇ , . . . , ⁇ satisfies the formula (6) or (7) and (8); or the phase 3 ⁇ 4 2 , . . . , ⁇ satisfies (9) or ⁇ (10) And (11).
- the phase shift ⁇ can be taken as ⁇ , ⁇ , etc. Phase ⁇ , ⁇ , ⁇ and phase shift ⁇ ⁇ and
- 3 ⁇ 4 is not limited to the above values, not here - enumerated.
- the vector may have a spatial granularity smaller than a, as shown by equations (4), (6) - (8) or as described in equations (5), (9) - (11), ie
- the precoding matrix W may be the following matrix
- ⁇ is a positive integer, for example, the value can be 1, 2, 4, 6, 8, 16, 32, 64, etc.
- N is a positive integer, for example, the value can be 1, 2, 4, 6, 8, 16, 32 , 64, etc.
- the precoding matrix W may be the following matrix
- ⁇ is a positive integer, for example, it can be 1, 2, 4, 6, 8, 16, 32, 64, etc.
- N is positive: number, for example, it can take values 1, 2, 4, 6, 8, 16, 32, 64, etc.
- the precoding matrix indication reported by the UE may be an index.
- the index directly indicates the precoding matrix W.
- Precoding matrix W Precoding matrix W.
- the precoding matrix indication reported by the UE may also be two indexes, such as ⁇ and 1 2 .
- W and W 2 in the equation (8) are respectively indicated by and i 2 such that ⁇ ! and i 2 indicate the precoding matrix W.
- the index can be reported based on a subset of ⁇ .
- the complete set of W ⁇ is Q
- the subset of set Q is Q. ,...,Q 3 .
- the index ⁇ is used to indicate that the matrix Q k in a certain subset Q k can be (3 ⁇ 4, ( ⁇ ..., (a certain subset of 3 ⁇ 4), where Qk can be predefined, and can be determined by the UE And reported, it can also be notified to the UE by the eNB.
- the subsets Q,,..., Q 3 can be mutually disjoint, that is, the intersection of each subset is an empty set; the subset Q.,...,Q 3 It is also possible to intersect each other, that is, the intersection of each subset is a non-empty set.
- the subsets that do not intersect each other have a small design overhead, which is more conducive to the design of PUCCH feedback; the subset design that intersects each other is advantageous for overcoming the edge effect and is more advantageous for PUSCH. Feedback design. or,
- the precoding matrix indication reported by the UE may also be three indexes, such as i 3 , i 4 , and i 5 .
- i 3 , i 4 and i 5 indicate the precoding matrix W
- the index i 3 can be reported based on the subset.
- the complete set is R
- the subset of set R is R. ,..., R 7 .
- the index i 3 is now used to indicate the matrix in a certain subset R k .
- R k can be! ⁇ ,! ⁇ ...,! A subset of ⁇ .
- the foregoing may be predefined, and may be determined by the UE to be "3 ⁇ 4" or may be notified by the eNB to the UE.
- the subset, ..., 1 7 may be mutually disjoint, that is, the intersection of each subset is an empty set;
- Set R,,..., R 7 can intersect each other, that is, the intersection of each subset is not an empty set; similarly, i 4 and i 5 can be reported based on a subset of 2 and ⁇ 2 , respectively, where 2 and ⁇
- the subset of $ 2 may be predefined, may be determined and reported by the UE, or may be notified to the UE by the eNB.
- the precoding matrix indication reported by the UE may also be another three indexes, such as i 6 , i 7 and i 8 , where C and D in the formula (11) are implicitly indicated by i 6 and i 7 respectively.
- ⁇ 2 Use implicit instructions.
- i 6 , i 7 and i 8 indicate the precoding matrix W, at this time ⁇ ⁇ and . . "
- the index i 6 can be reported based on a subset of C.
- the complete set of C is 0, and the subset of set 0 is 0. ,..., 0 7 .
- the index i 6 is used to indicate the matrix C in a certain subset O k , and o k may be 0. , O . . , 0 7 of a subset.
- the O K may be predefined, or may be determined and reported by the UE, or may be notified by the eNB to the UE.
- Subset 0. ,..., 0 7 can be mutually disjoint, that is, the intersection of each subset is an empty set; the subset is 0.
- i 7 and i 8 can be reported based on 1), and a subset of ⁇ 2 , respectively.
- the subset of 1), and ⁇ 2 may be predefined, may be determined and reported by the UE, or may be notified to the UE by the eNB.
- the precoding matrix indication of >3 ⁇ 4 may also be four indexes, such as i 9 , i 10 , i u and ii2 o where C ⁇ PC 2 in the equation (11) uses i 9 , ⁇ respectively. Implied indication, D ⁇ DW is indicated by i u and i 12 respectively. Thus, i 9 , i 10 , i u and i 12 indicate the precoding matrix ⁇ .
- the indices i 9 , i 10 , i u and i 12 can be reported based on a subset of C 2 , D, and ⁇ 2 , respectively.
- the subset of C 2 , and ⁇ 2 may be predefined, may be determined and reported by the UE, or may be notified by the eNB to the UE.
- the precoding matrix indication may be calculated based on a reference signal subset, for example, the index value n as described above is based on the reference described in step 403.
- Signal subset P calculates or the index value and i 2 or i 3 , I4 and is or i6 , ⁇ 7 ' is or i9, iio, in and i 12 are calculated based on the reference signal subset P described in step 403;
- the precoding matrix indication may be jointly calculated based on a plurality of reference signal subsets, for example, the index value n as described above is calculated based on the reference signal subsets P1 and P2 described in step 403 or the index values ⁇ and i 2 Or i 3 , i 4 and i 5 or i 6 , i 7 , i 8 or i 9 , i 10 , i u and i 12 are calculated based on the reference signal subsets PI and P2 described in step 403;
- the precoding matrix indication is separately calculated based on a plurality of reference signal subsets, for example, the index value i 3 as described above is based on the reference signal subsets PI, i 4 and i 5 described in step 403 based on the reference described in step 403 Signal subset P2 is calculated.
- the index value i. 6 above step 403 based on the reference signal subset PI, i 7 and i are calculated based on the reference signal P2 8 sets said sub-step 403.
- the reference signal subsets PI, i u and i 12 based on step 403 are calculated based on the reference signal subset P2 described in step 403.
- the UE may determine the one or more indexes based on the measured channel state based on preset criteria, where the preset criterion may be a throughput maximum criterion or a capacity maximum criterion. After obtaining the foregoing precoding matrix indication, the UE may feed back to the eNB through the PUCCH or the PUSCH.
- the foregoing precoding matrix indicates that the UE may report the eNB to the eNB by using a PUCCH in different subframes.
- a plurality of different indexes in the precoding matrix indication may be reported to the eNB by using the PUCCH in different subframes for different subbands in the frequency domain.
- the eNB obtains a precoding matrix W according to the obtained precoding matrix indication, and the precoding matrix has a structure represented by the formulas (1)-(3), (4)-(12), (23)-(35).
- the eNB uses the precoding matrix W to transmit a signal vector s. Specifically, the signal vector transmitted after precoding is W s .
- the UE receives the signal sent by the eNB and performs data detection. Specifically, the UE receives the signal as
- y HWs + n ( 36 ) where y is the received signal vector, H is the estimated channel matrix, and n is the measured noise and interference.
- the block matrix X of the kronecker product form in the codebook structure of the above precoding matrix can realize vertical and horizontal precoding by matrix C and matrix D, respectively, thereby fully utilizing the freedom of the active antenna system in the vertical direction. Degree, thereby improving feedback accuracy, improving MIMO, especially MU-MIMO performance.
- FIG. 4 is a schematic flow chart of a multi-antenna transmission method according to an embodiment of another embodiment of the present invention.
- the embodiment of Figure 4 is a scenario in which a plurality of intermediate matrices are indicated for a first index.
- the matrix matrix C or the matrix D in the precoding matrix is a function of the plurality of intermediate matrices.
- the matrix C, or matrix D can be used for precoding in the horizontal or vertical direction.
- the UE receives the first reference signal set.
- step 401 of FIG. 3 The detailed description is the same as step 401 of FIG. 3, and therefore will not be described again.
- the UE determines, according to the received first reference signal set, a plurality of intermediate matrices, and reports, to the base station, a first index used to indicate the intermediate matrix.
- the matrix may be two matrices A and B.
- each column of A and B is a DFT vector or a column vector of a Hadamard matrix, that is,
- N a ⁇ 1 and N b ⁇ 1 are the number of columns of matrices A and B, respectively ⁇ ⁇ 1 and N f , ⁇ ; ⁇ 1 are the number of columns of different Hadamard matrices and the number of columns of DFT vectors, respectively.
- ! ⁇ ,! ⁇ is the column vector of the Hadamard matrix.
- f n , f is the DFT vector, ie t, f is expressed as
- M, M', N, N' are all integers.
- the matrix A can also adopt other forms of matrix, such as 4 antennas in the LTE R8 or Precoding matrix in 8 antenna codebook in LTE RIO.
- the set of candidate matrices A is C A , and each of the matrices can be indicated by one or more indices.
- the precoding matrix W may be the following matrix
- the precoding matrix W may be the following matrix
- ⁇ is a positive integer, for example, the value can be 1, 2, 4, 6, 8, 16, 32, 64, etc.
- N is a positive integer, for example, the value can be 1, 2, 4, 6, 8, 16, 32 , 64, etc.
- the precoding matrix w can match the actually deployed antenna configuration; since the granularity of the value is ⁇ /16, thereby achieving more accurate spatial quantization, the CSI feedback accuracy can be improved; and precoding is performed.
- the two columns of the matrix W are orthogonal to each other, which can reduce the interference between the layers.
- the set of candidate matrices is C A or C B , and may be further divided into multiple subsets, where each subset may be associated with a specific cell identifier or have a mapping relationship. example If the subset C ⁇ in C A is associated or mapped to the cell identity IDi, another subset C in C A is associated or mapped to the cell identity ID 2 . The subset Ci? and C may or may not have an intersection.
- the set of first indexes used to indicate each matrix may also be divided into a plurality of subsets, wherein each subset may be associated with a specific cell identifier or have a mapping relationship.
- a first indication associated with an index of a subset of C B C £) in a matrix or in a cell identification mapping an index for a first indication associated with a subset of C B matrix or mapped to the cell identifier ID 2 .
- the association or mapping relationship between the subset of the foregoing matrix or the subset of the one or more indexes and the cell identifier may be predefined, or may be notified by the eNB to the UE, such as through high layer signaling, such as RRC signaling or downlink control. Channel notification.
- Each of the above subsets may contain only one element.
- the above cell identifier is not necessarily a specific communication protocol such as a cell ID in LTE, and it may also be a specific parameter for distinguishing cell attributes, such as an index or an offset in a certain cell group.
- the association or mapping relationship between the subset of the foregoing matrix or the subset of one or more indexes and the cell identifier may implement cell splitting or cell identification.
- the UE may obtain a corresponding channel matrix by channel estimation based on the received first reference signal set.
- an optimal matrix A or B can be selected, where matrix A or B can be used as a precoding matrix.
- the first index may include one or more index values.
- One or more indexes corresponding to the above-mentioned optimal matrix A or B may be fed back through high layer signaling, or may be fed back to the eNB through PUCCH or PUSCH.
- the corresponding metric value may be additionally reported, for example: SINR or CQI or received power.
- the UE receives a second reference signal set, where the second reference signal set may include one or more reference signal subsets.
- step 403 in FIG. 3 The detailed description is the same as step 403 in FIG. 3, and therefore will not be described again.
- the UE determines a precoding matrix based on the second reference signal set, and reports, to the base station, a precoding matrix indication indicating the precoding matrix.
- the matrix. Is a function of said plurality of intermediate matrix, comprising The kth column c k of the matrix ⁇ satisfies the equation (13) and the first column d of the matrix D ; satisfies the equation (14) where 2, . . . , w v and m H are real numbers, for example 2 , ⁇ , w v or m H is a symmetry sequence, ie w 'w — or " ⁇ " , ⁇ , " ⁇ or ⁇ , ,..., ⁇ are all ⁇ .
- phase ⁇ , , . . . , ⁇ satisfies the equations (15) or (16) and (17); or the phase ⁇ , , . . . , ⁇ satisfies (18) or (19) and (20) ).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , ⁇ , etc.
- the phase d, "., ⁇ and ⁇ ..., ⁇ and the phase shift ⁇ are not limited to the above values, and are not listed here.
- Equation (13) (15) - (17)
- the vector may have a finer spatial granularity than a, ie
- the precoding matrix indication reported by the UE may also be two indexes, such as ⁇ and 1 2 .
- ⁇ and ⁇ 2 in the equation (8) are respectively indicated by i 2 such that i 2 indicates the precoding matrix ⁇ .
- the index can be reported based on a subset of ⁇ .
- the complete set of W ⁇ is Q
- the subset of set Q is Q. , ..., Q 3 at this time is used to indicate the index of a subset of the matrix Q K Q K QQ ⁇ may be a subset of QS.
- the Q K may be predefined, may be determined and reported by the UE, or may be notified to the UE by the eNB.
- Subset Q. ,...,Q 3 can be disjoint, ie each The intersection of the subsets is an empty set; the subset Q. , ..., Q 3 can also intersect each other, that is, the intersection of each subset is not an empty set;
- the precoding matrix indication reported by the UE may also be three indexes, such as i 3 , i 4 , and i 5 .
- i 3 , i 4 and i 5 indicate the precoding matrix W.
- the index i 3 can be reported based on the subset.
- the complete set is R
- the subset of set R is R. ,..., R 7 .
- the index i 3 is now used to indicate the matrix in a certain subset R k .
- R k can be! ⁇ ,! ⁇ ...,! A subset of ⁇ .
- R k may be predefined, may be determined by the UE and may be "3 ⁇ 4", or may be notified by the eNB to the UE.
- the subset R., ..., R 7 may be mutually disjoint, that is, the intersection of the subsets is The empty set; the subset R.,..., R 7 can intersect each other, that is, the intersection of each subset is not an empty set; similarly, i 4 and i 5 can be reported based on a subset of ⁇ 2 , respectively.
- the subset of and ⁇ 2 may be predefined, may be determined and reported by the UE, or may be notified to the UE by the eNB.
- the precoding matrix indication reported by the UE may also be another three indexes, such as i 6 , i 7 and i 8 .
- i 6 , i 7 and i 8 are another three indexes, such as i 6 , i 7 and i 8 .
- i 6 , i 7 and i 8 indicate the precoding matrix W,
- the index i 6 can be reported based on a subset of ⁇ .
- the complete set of ⁇ is 0, and the subset of set 0 is 0. ,..., 0 7 .
- the index i 6 is used to indicate the matrix C in a certain subset O k ; O k can be zero. , a subset of C ..., 0 7 .
- the O k may be predefined, or may be determined and reported by the UE, or may be notified by the eNB to the UE.
- Subset 0. ,..., 0 7 can be mutually disjoint, that is, the intersection of each subset is an empty set; the subset is 0.
- ⁇ 7 and i 8 can be reported based on a subset of 1) ; and ⁇ 2 , respectively.
- ⁇ ⁇ 2 subsets may be predefined, may be determined and reported by the UE, an eNB can be notified to the UE.
- the indices i 9 , i 10 , i u and i 12 may be based on C 2 , respectively. ; and a subset of ⁇ 2 is reported.
- the subset of C 2 , D ⁇ PW 2 may be predefined, may be determined and reported by the UE, or may be notified by the eNB to the UE.
- the precoding matrix indication may be calculated based on a reference signal subset, for example, the index value n as described above is based on the reference described in step 603.
- the precoding matrix indication may be jointly calculated based on a plurality of reference signal subsets, for example, the index value n as described above is calculated based on the reference signal subsets P1 and P2 described in step 603 or the index values ⁇ and i 2 Or i 3 , i 4 and i 5 or i 6 , i 7 , i 8 or i 9 , i 10 , iu and i 12 are calculated based on the reference signal subsets PI and P2 described in step 603;
- the precoding matrix indication is separately calculated based on a plurality of reference signal subsets, for example, the index value i 3 as described above is based on the reference signal subsets PI, i 4 and i 5 described in step 603 based on the reference described in step 603 Signal subset P2 is calculated.
- the index value i. 6 above step 603 based on the reference signal subset PI, i 7 and i are calculated based on the reference signal P2 8 sets said sub-step 603.
- the reference signal subsets PI, i u and i 12 based on step 603 are calculated based on the reference signal subset P2 described in step 603.
- the UE may determine the one or more indexes based on the measured channel state based on preset criteria, where the preset criterion may be a throughput maximum criterion or a capacity maximum criterion. After obtaining the foregoing precoding matrix indication, the UE may feed back to the eNB through the PUCCH or the PUSCH.
- the foregoing precoding matrix indicates that the UE may report the eNB to the eNB by using a PUCCH in different subframes.
- a plurality of different indexes in the precoding matrix indication may be reported to the eNB by using the PUCCH in different subframes for different subbands in the frequency domain.
- the eNB obtains a precoding matrix ⁇ based on the obtained precoding matrix indication.
- the precoding matrix may have a structure represented by the formulas (1) - (3), (13) - (22), (37) - (53).
- the eNB uses the precoding matrix W to transmit a signal vector s. Specifically, the signal vector transmitted after precoding is W s .
- the UE receives the signal sent by the eNB and performs data detection. Specifically, the UE receives the signal as
- FIG. 5 is a block diagram of a user equipment in accordance with one embodiment of the present invention.
- the user equipment 80 of FIG. 5 includes a receiving unit 81 and a feedback unit 82.
- the receiving unit 81 is configured to receive a first reference signal set sent by the base station.
- the feedback unit 82 is configured to determine one or more intermediate matrices based on the first reference signal set, and report a first index indicating the determined intermediate matrix to the base station.
- the receiving unit 81 is further configured to receive a second reference signal set sent by the base station.
- the feedback unit 82 is further configured to determine a precoding matrix based on the second reference signal set, and report, to the base station, a precoding matrix indication for indicating the determined precoding matrix.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the beam can be dynamic or Semi-persistent scheduling to avoid interference caused by cell splitting of multiple beams in different beams;
- the user equipment determines a precoding matrix according to the second reference signal set, where the matrix C in the precoding matrix structure ; or matrix 1 ); intermediate matrix is a function of, user equipment is further optimized precoding based on which the beam or beam group.
- the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of antenna ports arranged in the same direction in the antenna port array, or corresponds to a quasi-co-located antenna port. Subset.
- the second reference signal set includes one or more reference signal subsets, where the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with the cell identifier.
- the matrix. Or a matrix
- said plurality of intermediate matrix or a function comprising:
- the column of the matrix ⁇ (satisfying the formula (4) or matrix 1) ; satisfies the formula (5) where " ⁇ " , . , , ⁇ are real numbers, such as ⁇ , ⁇ , or
- P k , H are respectively a symmetry sequence, ie Xk'Nv , ⁇ or Or " ⁇ ,” ⁇ ...,” ⁇ or A 'Ay'A have a value of 1.
- phase ⁇ , 2, ..., satisfies the formula (6) or (7) and (8); or the phase 3 ⁇ 4 , % , 2 , ..., ⁇ satisfies (9) or ⁇ (10) And (11).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , and so on. Phase ⁇ ,..., ⁇ and ⁇ , ⁇ ,... ⁇ and phase shift ⁇ , and
- 3 ⁇ 4 is not limited to the above values, not here - enumerated.
- the intermediate matrix is a matrix A composed of column vectors of a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or a Hausschild Household matrix, and the matrix or matrix 1) ; is a function of the intermediate matrix A.
- the matrix. ; and matrix 1) is a function of the one or more intermediate matrices, including:
- phase, , . . . , ⁇ satisfies the equations (15) or (16) and (17); or the phase satisfies (18) or (19) and (20).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , ⁇ , etc.
- the phase ⁇ 2 , ⁇ , ⁇ ⁇ and ⁇ ..., ⁇ and the phase shifts ⁇ and ⁇ are not limited to the above values, and are not listed here.
- each of the intermediate matrix as a two matrices A and B vectors or column vectors of the DFT Hadamard matrix composed of a matrix or a matrix ⁇ 1); said intermediate matrix A And the function of B.
- the precoding matrix may be a matrix represented by (31) - (35).
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is predefined or The base station notifies the user equipment.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is Defined or notified to the user equipment by the base station.
- the base station of the embodiment of the present invention transmits two reference signal sets, and the UE determines and indicates an intermediate matrix according to the first reference signal set, and the base station can determine a suitable beam according to the information, thereby avoiding the splitting of each user in different beams due to cell splitting. Interference; the UE determines a precoding matrix according to the second reference signal set, where the precoding matrix is a product of two matrices ⁇ and ⁇ 2 , and the matrix ⁇ is a sub
- the kronecker product of D ; the matrix C ; or the matrix D ; is a function of the intermediate matrix, and the structure of the precoding matrix can make full use of the horizontal and vertical degrees of freedom of the AAS base station antenna, and at the same time, the matrix. ; Matrix or 1); as a function of the intermediate matrix, such that the intermediate matrix based on the feedback precoding matrix indicator the PMI, CSI feedback accuracy can be further improved, thereby improving the transmission performance of the active antenna system.
- the user equipment of the embodiment of the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving The performance of the system in the above antenna configuration, in particular the AAS base station antenna configuration.
- feedback of one or more indexes based on the subset to indicate the precoding matrix will fully utilize the time/frequency domain/space correlation of the channel, thereby reducing the overhead of feedback.
- FIG. 6 is a block diagram of a base station in accordance with one embodiment of the present invention.
- the base station 90 of Fig. 6 includes a transmitting unit 91 and a receiving unit 92.
- the sending unit 91 is configured to send the first reference signal set to the user equipment.
- the receiving unit 92 is configured to receive, by the user equipment, the first index according to the first reference signal set, where the first index is used to indicate one or more intermediate matrices.
- the sending unit 91 is further configured to send the second reference signal set to the user equipment.
- the receiving unit 92 is further configured to receive, by the user equipment, a precoding matrix indication reported by the second reference signal set, where the precoding matrix indication is used to indicate a precoding matrix, where the precoding matrix is two
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the beam can be dynamic or Semi-persistent scheduling to avoid interference caused by cell splitting of multiple beams in different beams;
- the user equipment determines a precoding matrix according to the second reference signal set, where the matrix C in the precoding matrix structure ; or matrix 1 ); intermediate matrix is a function of, user equipment is further optimized precoding based on which the beam or beam group.
- the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the first reference signal set corresponds to a subset of the same polarized antenna ports, or corresponds to a subset of the antenna ports arranged in the same direction in the antenna port array, or corresponds to the antenna port located in the quasi-colocated Subset.
- the second reference signal set includes one or more reference signal subsets, where the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with the cell identifier.
- the matrix. Or a matrix
- said plurality of intermediate matrix or a function comprising:
- the column of the matrix ⁇ (which satisfies the formula (4) or the matrix 1) ; satisfies the formula (5) wherein 3 ⁇ 41 , , 2 ,..., , and ⁇ 1 , ⁇ , ⁇ ⁇ are Real numbers, such as ⁇ ,..., or
- P k , H are respectively a symmetry sequence, ie Xk'Nv , ⁇ or Or " ⁇ ,” ⁇ ...,” ⁇ or A 'Ay'A have a value of 1.
- phase, ⁇ , . . . , ⁇ satisfies the formula (6) or (7) and (8); or the phase 3 ⁇ 4 , % , 2 , ..., ⁇ satisfies (9) or ⁇ (10) and (11).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , and so on. Phase ⁇ , ⁇ , ⁇ and phase shift ⁇ ⁇ and
- the one or more intermediate matrices indicated by the first index are a matrix A composed of a column vector of a discrete Fourier transform DFT vector or a Hadamard Hadamard matrix or a Hausschild Household matrix.
- the matrix or matrix ⁇ 1); a is a function of the intermediate matrix.
- matrix A is as shown in equations (23) - (30).
- the matrix. ; and matrix 1) is a function of the one or more intermediate matrices, including:
- phase, , . . . , ⁇ satisfies the equations (15) or (16) and (17); or the phase ⁇ , , . . . , ⁇ satisfies (18) or (19) and (20) .
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as gentry, ⁇ , etc.
- the phase H ", ⁇ v v and ⁇ ..., ⁇ and the phase shift ⁇ ⁇ are not limited to the above values, and are not listed here.
- the one or more intermediate matrices indicated by the first index are two matrices A and B, each of which is a column vector of a DFT vector or a Hadamard matrix, the matrix. ; Or a matrix); said intermediate matrix A and B functions.
- matrices A and B are as shown in equations (32) - (43).
- the precoding matrix may be a matrix represented by (45) - (49).
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is predefined or The base station notifies the user equipment.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is Defined or notified to the user equipment by the base station.
- the base station of the embodiment of the present invention transmits two reference signal sets, and the UE determines and indicates an intermediate matrix according to the first reference signal set, and the base station can determine a suitable beam according to the information, thereby avoiding the splitting of each user in different beams due to cell splitting.
- the UE determines a precoding matrix according to the second reference signal set, where the precoding matrix is a product of two matrices ⁇ and ⁇ 2 , and the matrix ⁇ is a sub
- the kronecker product of D ; the matrix C ; or the matrix D ; is a function of the intermediate matrix, and the structure of the precoding matrix can make full use of the horizontal and vertical degrees of freedom of the AAS base station antenna, and at the same time, the matrix.
- Matrix or 1 as a function of the intermediate matrix, such that the intermediate matrix based on the feedback precoding matrix indicator the PMI, CSI feedback accuracy can be further improved, thereby improving the transmission performance of the active antenna system.
- the user equipment of the embodiment of the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving The performance of the system in the above antenna configuration, in particular the AAS base station antenna configuration.
- reporting one or more indexes based on the subset to indicate the precoding matrix will fully utilize the time/frequency domain/space correlation of the channel, thereby reducing the overhead of feedback.
- the user equipment 1000 of FIG. 7 includes a receiver 1200, a transmitter 1300, a processor 1400, and a memory 1500.
- the receiver 1200 is configured to receive a first reference signal set sent by the base station.
- the memory 1500 stores instructions that cause the processor 1400 to: determine and feed back a first index based on the first set of reference signals, the first index being used to indicate one or more intermediate matrices;
- the transmitter 1300 is configured to report the first index to the base station.
- the receiver 1200 is further configured to receive a second reference signal set sent by the base station.
- the transmitter 1300 is further configured to feed back the precoding matrix indication to the base station.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the beam can be dynamic or Semi-persistent scheduling to avoid interference caused by cell splitting of multiple beams in different beams;
- the user equipment determines a precoding matrix according to the second reference signal set, where the precoding Matrix structure of the matrix C; 1 or a matrix); intermediate matrix is a function of, user equipment is further optimized precoding based on which the beam or beam group.
- the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the receiver 1200, the transmitter 1300, the processor 1400, and the memory 1500 can be integrated into one processing chip. Alternatively, as shown in FIG. 7, the receiver 1200, the transmitter 1300, the processor 1400, and the memory 1500 are connected by a bus system 1600.
- user equipment 1000 may also include an antenna 1100.
- the processor 1400 can also control the operation of the user device 1000, which can also be referred to as a CPU (Central Processing Unit).
- Memory 1500 can include read only memory and random access memory and provides instructions and data to processor 1400. Portions of memory 1500 may also include non-volatile, random access memory.
- the various components of the user equipment 1000 are coupled together by a bus system 1600, which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, various buses are labeled as bus system 1600 in the figure.
- the first reference signal set corresponds to a subset of co-polarized antenna ports, or a subset of antenna ports corresponding to the same direction in the antenna array, or a subset of antenna ports corresponding to the quasi-co-located .
- the second reference signal set includes one or more reference signal subsets, where the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with the cell identifier.
- the matrix. Or a matrix
- said plurality of intermediate matrix or a function comprising:
- the column of the matrix ⁇ (which satisfies the formula (4) or matrix 1) ; satisfies the formula (5) where a k:i w, o k , Nv and ⁇ ⁇ , ⁇ ⁇ ⁇ , ⁇ ⁇ are Real numbers, such as " ⁇ , ⁇ , . , ⁇ or
- P k , H are respectively a symmetry sequence, ie two or two, ⁇ , ⁇ ⁇ ⁇ or Or " ⁇ ,” ⁇ ...,” ⁇ or A 'Ay'A have a value of 1.
- phase, ⁇ , . . . , ⁇ satisfies the formula (6) or (7) and (8); or
- the phase 3 ⁇ 4 2 , . . . , ⁇ satisfies (9) or (10) and (11).
- the phase shift ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , etc. Phase ⁇ ,..., ⁇ and ⁇ , ⁇ ,... ⁇ and phase shift ⁇ , and
- 3 ⁇ 4 is not limited to the above values, not here - enumerated.
- the one or more intermediate matrices are matrices A, which are columns of discrete Fourier transform DFT vectors or Hadamard Hadamard matrices or Hauser's Householdholder matrices. ; Or a matrix); A is a function of the intermediate matrix.
- matrix A is as shown in equations (23) - (30).
- the matrix. ; and matrix 1) is a function of the one or more intermediate matrices, including:
- the column of the matrix ⁇ (which satisfies the equation (13) and the column /c of the matrix D ; satisfies the equation (14)
- " , 2 , . . . , 3 ⁇ 4 ⁇ ⁇ and m H are both real numbers, for example 2 , ⁇ , 3 ⁇ 4 ⁇ ⁇ or m H is a symmetry sequence, ie w 'w — or Or ⁇ , ,..., the value is ⁇ .
- phase ⁇ , , . . . , ⁇ satisfies the equations (15) or (16) and (17); or the phase 1 , 2 n ⁇ satisfies (18) or (19) and (20).
- the phase shift ⁇ , and ⁇ can be taken as the value of K, Shi, etc.
- the phase H ", ⁇ v v and ⁇ ..., ⁇ and the phase shift ⁇ ⁇ are not limited to the above values, and are not listed here.
- one or more intermediate matrix as each of the two matrices A and B vectors or column vectors of the DFT Hadamard matrix composed of a matrix or a matrix ⁇ 1); said intermediate
- the functions of matrices A and B are as shown in equations ( 37 ) - ( 44 ) ( 50 ) - ( 53 ).
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is predefined or The base station notifies the user equipment.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is Defined or notified to the user equipment by the base station.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the dynamics of the beam can be passed. Or semi-persistent scheduling, to avoid interference caused by cell splitting of multiple beams in different beams; the user equipment determines a precoding matrix according to the second reference signal set, where the matrix C in the precoding matrix structure ; or a matrix 1); as a function of the intermediate matrix, user equipment is further optimized precoding based on which the beam or beam group. In this way, the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the user equipment of the embodiment of the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving The performance of the system in the above antenna configuration, in particular the AAS base station antenna configuration.
- feedback of one or more indexes based on the subset to indicate the precoding matrix will fully utilize the time/frequency domain/space correlation of the channel, thereby reducing the overhead of feedback.
- FIG. 8 is a block diagram of a base station in accordance with another embodiment of the present invention.
- the base station 2000 of Figure 8 includes a transmitter 2200 and a receiver 2300.
- the transmitter 2200 is configured to send the first reference signal set to the user equipment.
- the receiver 2300 is configured to receive a first index that is determined and reported by the user equipment based on the first reference signal set, where the first index is used to indicate one or more intermediate matrices.
- the transmitter 2200 is further configured to send the second reference signal set to the user equipment.
- the receiver 2300 is further configured to receive, by the user equipment, a precoding matrix indication reported by the second reference signal set, where the precoding matrix indication is used to indicate a precoding matrix, where the precoding matrix is two
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the beam can be dynamic or Semi-persistent scheduling to avoid interference caused by cell splitting of multiple beams in different beams;
- the user equipment determines a precoding matrix according to the second reference signal set, where the matrix C in the precoding matrix structure ; or matrix 1 ); intermediate matrix is a function of, user equipment is further optimized precoding based on which the beam or beam group.
- intermediate matrix is a function of, user equipment is further optimized precoding based on which the beam or beam group.
- Transmitter 2200 and receiver 2300 can be integrated into one processing chip. Alternatively, as shown in FIG. 8, the transmitter 2200 and the receiver 2300 are connected by a bus system 1600.
- base station 2000 can also include an antenna 2100, a processor 2400, and a memory 2500.
- the processor 2400 can control the operation of the base station 2000, and the processor 2400 can also be referred to as a CPU (Central Processing Unit).
- Memory 2500 can include read only memory and random access memory and provides instructions and data to processor 2400. A portion of the memory 2500 can also include a non-volatile random access memory.
- the various components of user equipment 2000 are coupled together by a bus system 2600, which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, various buses are labeled as bus system 2600 in the figure.
- the first reference signal set corresponds to a subset of co-polarized antenna ports, or a subset of antenna ports corresponding to the same direction in the antenna array, or a subset of antenna ports corresponding to the quasi-co-located .
- the second reference signal set includes one or more reference signal subsets, where the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the reference signal subset corresponds to the same-polarized antenna port subset, or corresponds to the same in the antenna port array.
- the first reference signal set is a subset of the second reference signal set.
- the first reference signal set is associated with the cell identifier.
- the matrix. Or a matrix
- said plurality of intermediate matrix or a function comprising:
- the column of the matrix ⁇ (which satisfies the formula (4) or the matrix 1) ; satisfies the formula (5) wherein 3 ⁇ 41 , , 2 ,..., , and ⁇ 1 , ⁇ , ⁇ ⁇ are Real numbers, such as ⁇ ,..., or
- P k , H are respectively a symmetry sequence, ie Xk'Nv , ⁇ or Or " ⁇ ,” ⁇ ...,” ⁇ or A 'Ay'A have a value of 1.
- phase, ⁇ , . . . , ⁇ satisfies the equations (6) or (7) and (8); or the phase 3 ⁇ 4 , % , 2 , ..., ⁇ satisfies (9) or ⁇ (10) and (11).
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as ⁇ , ⁇ , and so on. Phase ⁇ , ⁇ , ⁇ and phase shift ⁇ ⁇ and
- the one or more intermediate matrices indicated by the first index are a matrix formed by column vectors of DFT vectors or Hadamard matrices or Householder matrices.
- matrix A the matrix ⁇ or matrix D ; is a function of the intermediate matrix A.
- matrix A is as shown in equations (23) - (30).
- the matrix. ; and matrix 1) is a function of the one or more intermediate matrices, including:
- phase, , . . . , ⁇ satisfies the equations (15) or (16) and (17); or the phase ⁇ , , . . . , ⁇ satisfies (18) or (19) and (20) .
- the phase shift ⁇ ⁇ and 3 ⁇ 4 ⁇ can be taken as gentry, ⁇ , etc.
- the phase H ", ⁇ v v and ⁇ ..., ⁇ and the phase shift ⁇ ⁇ are not limited to the above values, and are not listed here.
- the one or more intermediate matrices indicated by the first index are two matrices A and B, each of which is a column vector of a DFT vector or a Hadamard matrix, the matrix. ; Or a matrix); said intermediate matrix A and B functions.
- matrices A and B are shown in equations (37) - (44) (50) - (53).
- the precoding matrix may be a matrix represented by (45) - (49).
- the subset of the set formed by the matrix A or the matrix A is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is predefined or The base station notifies the user equipment.
- the subset of the set of the matrix A and the B or the matrix A and the B is associated with the cell identifier or has a mapping relationship with the cell identifier, where the association or mapping relationship is Defined or notified to the user equipment by the base station.
- the user equipment determines an intermediate matrix according to the first reference signal set, and each column vector of the intermediate matrix corresponds to one beam.
- the user equipment feeds back the different intermediate matrix, that is, the beam or the beam group. Therefore, the base station can know the beam or beam group where the user equipment is located according to the intermediate matrix fed back by the user equipment, so that the beam can be dynamic or Semi-static scheduling to avoid cell splitting between multiple users in different beams due to multi-beam formation
- the induced interference user equipment determines a second set of reference signals according to a precoding matrix, wherein the pre-coding matrix C of the matrix structure; or a matrix); intermediate matrix is a function, which facilitates a user equipment based on the beam or beams
- the group further optimizes the precoding. In this way, the precoding matrix based on the intermediate matrix not only facilitates obtaining the cell splitting gain, but also further improves the accuracy of the CSI feedback, thereby improving the transmission performance of the active antenna system.
- the user equipment of the embodiment of the present invention selects and reports the precoding matrix indication PMI according to the codebook scheme, and the base station performs precoding according to the PMI information reported by the user equipment, thereby improving The performance of the system in the above antenna configuration, in particular the AAS base station antenna configuration.
- feedback of one or more indexes based on the subset to indicate the precoding matrix will fully utilize the time/frequency domain/space correlation of the channel, thereby reducing the overhead of feedback.
- the disclosed systems, devices, and methods may be implemented in other ways.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
- the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
- the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solution of the embodiment.
- each functional unit in various embodiments of the present invention may be integrated into one processing unit
- each unit may exist physically separately, or two or more units may be integrated into one unit.
- the functions, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium.
- the technical solution of the present invention which is essential to the prior art or part of the technical solution, may be embodied in the form of a software product stored in a storage medium, including
- the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .
Abstract
Description
Claims
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JP2016512190A JP6052468B2 (ja) | 2013-05-10 | 2013-05-10 | プリコーディング行列インジケータを決定するための方法、ユーザ機器、及び、基地局 |
CN201380073753.9A CN105027457B (zh) | 2013-05-10 | 2013-05-10 | 确定预编码矩阵指示的方法、用户设备和基站 |
PCT/CN2013/075488 WO2014179991A1 (zh) | 2013-05-10 | 2013-05-10 | 确定预编码矩阵指示的方法、用户设备和基站 |
EP13884279.4A EP2985923B1 (en) | 2013-05-10 | 2013-05-10 | Method for determining precoding matrix indicator, user equipment, and base station |
CN201810462434.1A CN108616299B (zh) | 2013-05-10 | 2013-05-10 | 确定预编码矩阵指示的方法、用户设备和基站 |
US14/937,392 US9391681B2 (en) | 2013-05-10 | 2015-11-10 | Method for determining precoding matrix indicator, user equipment, and base station |
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- 2013-05-10 WO PCT/CN2013/075488 patent/WO2014179991A1/zh active Application Filing
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US10224996B2 (en) | 2014-04-10 | 2019-03-05 | Huawei Technologies Co., Ltd | Method for reporting channel state information user equipment, and base station |
US10587325B2 (en) | 2014-04-10 | 2020-03-10 | Huawei Technologies Co., Ltd. | Method for reporting channel state information, user equipment, and base station |
US10491340B2 (en) | 2015-01-30 | 2019-11-26 | Huawei Technologies Co., Ltd. | Feedback information transmission method in communications system and apparatus |
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Publication number | Publication date |
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CN105027457A (zh) | 2015-11-04 |
CN108616299B (zh) | 2021-06-15 |
CN105027457B (zh) | 2018-05-29 |
EP2985923B1 (en) | 2019-04-03 |
JP2016520266A (ja) | 2016-07-11 |
EP2985923A4 (en) | 2016-03-09 |
JP6052468B2 (ja) | 2016-12-27 |
EP2985923A1 (en) | 2016-02-17 |
CN108616299A (zh) | 2018-10-02 |
US9391681B2 (en) | 2016-07-12 |
US20160065279A1 (en) | 2016-03-03 |
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