WO2016015225A1 - 一种信道状态信息的反馈和接收方法、设备 - Google Patents
一种信道状态信息的反馈和接收方法、设备 Download PDFInfo
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- WO2016015225A1 WO2016015225A1 PCT/CN2014/083242 CN2014083242W WO2016015225A1 WO 2016015225 A1 WO2016015225 A1 WO 2016015225A1 CN 2014083242 W CN2014083242 W CN 2014083242W WO 2016015225 A1 WO2016015225 A1 WO 2016015225A1
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
-
- 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
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0645—Variable feedback
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a method and device for feeding back and receiving channel state information. Background technique
- MIMO Multiple Input Multiple Output
- LTE Long Term Evolution
- eNB evolved base station
- eNB uses a precoding matrix to pre-process or pre-code data to be transmitted to reduce single-user MIMO (Single User-MIMO, SU- Interference between different data streams in MIMO), or interference of data streams between different users in multi-user MIMO (Multi-User MIMO, MU-MIMO), so as to improve the signal to interference ratio (Signal to Interference and Noise Ratio) , SINR).
- the information required for the pre-processing is based on the measurement information of the downlink channel fed back by the User Equipment (UE).
- the UE performs channel estimation according to a reference signal sent by the eNB, such as a Channel State Information-Reference Signals (CSI-RS), and determines CSI according to the estimation result, where the CSI includes a transmission rank (ie, transmitted Information such as the number of data layers, the precoding matrix, and the Channel Quality Indicator (CQI), and then the UE feeds back the determined CSI to the eNB.
- CSI-RS Channel State Information-Reference Signals
- the CSI fed back by the UE is only a reference when it is provided to the eNB for downlink scheduling. Specifically, how to use the CSI fed back by the UE will be determined by the eNB.
- precoding Matrix Indicator The codebook is predefined, that is, the eNB and the UE end store the same codebook, and the understanding of the correspondence between each precoding matrix and the PMI in the codebook is consistent.
- the UE is based on the estimated downlink channel, from the defined codebook
- the UE only needs to feed back the PMI corresponding to the selected precoding matrix to the eNB.
- the eNB may determine a specific precoding matrix according to the PMI fed back by the UE.
- the codebook design is directly related to the specific configuration of the transmit antenna on the eNB side. For example, 2, 4, and 8 antenna ports supported in LTE Rel-8/9/10, in configuration, these antenna ports are placed in the same dimension, that is, horizontal, as shown in Figure 1A and Figure 1B.
- 1A shows a schematic diagram of the placement of a 2-antenna port and a 4-antenna Uniform Linear Array (ULA);
- FIG. 1B shows a cross-polarization of a 2-antenna port, a 4-antenna port, and an 8-antenna port. Schematic diagram of the placement method.
- the role of the precoding matrix is to adjust the phase on each antenna port to generate a horizontal beam pointing to the UE, as shown in Figure 2, PMI 1 , PMI 2, PMI 3 ,
- the four beams of PMI 4 serve UE 1, UE 2, UE 3 and UE 4, respectively, thereby increasing the SINR of the signal.
- Such an antenna configuration is suitable for serving the distribution of users in one cell on the same horizontal plane (for example, users are distributed on the ground), and the eNB can generate multiple beams in different directions simultaneously by using multiple different precoding matrices.
- the MIMO approach serves different UEs separately.
- UEs of one cell are usually distributed in two directions of horizontal and vertical.
- UEs in one cell are distributed in different buildings and on different floors of the same building. Since the current antenna port configuration can only control the direction of the beam in the horizontal direction, it will not be able to better serve UEs at different heights in the vertical direction. Due to the current development of AAS technology, it is easy to realize that the transmitting antenna or the antenna port on the eNB side is arranged in the horizontal and vertical two-dimensional directions.
- the antenna ports in the same horizontal direction can control the horizontal direction of the beam (such as antenna port 0, 1, 4, 5 or 2, 3, 6, 7 in Figure 3), and the antenna ports in different rows can be Control the vertical direction of the beam (as shown in Figure 4, the antenna ports (0, 1, 4, 5) and (2, 3, 6, 7) can jointly control the vertical direction of the beam).
- the two-dimensional antenna port configuration can freely control the horizontal and vertical directions of the beam to serve more UEs, as shown in Figure 4.
- the precoding matrix is designed to be placed horizontally for all antenna ports, and only the horizontal beam can be generated.
- existing The precoding matrix cannot control the beam direction in both the horizontal and vertical directions. Therefore, the existing precoding matrix cannot control the beam in the horizontal and vertical directions. Summary of the invention
- the embodiments of the present invention provide a method and a device for feeding back and receiving channel state information, which are used to solve the problem that the existing precoding matrix cannot control the beam in the horizontal and vertical directions.
- a first terminal device is used in a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined.
- the number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- a precoding matrix selection module configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding in the codebook subset The matrix is indicated by a first precoding matrix, a PMI, a second PMI, and a third PMI identifier for indicating a phase relationship, where the precoding matrix selection module corresponds to a precoding matrix selected by all subbands in the N subbands a PMI is the same, the precoding matrix selected by the precoding matrix selection module for each of the N subbands corresponds to a second PMI, and the precoding matrix selection module is all the children in the N subbands.
- the third PMI corresponding to the selected precoding matrix is the same;
- the reporting module is configured to report the first PMI, the second PMI, and the third PMI corresponding to the precoding matrix selected by the precoding matrix selection module.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set; or
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is a second precoding matrix index number of a precoding matrix in a codebook defined by a number of antenna ports greater than 4 in LTE Rel-10 and later; or
- the second PMI includes first information and second information, where the first information is used to indicate that the precoding matrix selection module is from the first a phase value selected by the sub-band corresponding to the second PMI in the third PMI, where the second information is a precoding in a codebook defined by an antenna port having a number greater than 4 in LTE Rel-10 and later versions The second precoding matrix index number of the matrix.
- the second possible implementation manner of the first aspect, the third possible implementation manner of the first aspect, or the fourth possible implementation manner of the first aspect, in the fifth possible implementation manner is expressed as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , which is a positive integer;
- ⁇ is a number greater than 4 in LTE Rel-10 and later versions a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- A denotes the discrete Fourier transform DFT column vector, ⁇ denotes the number of antenna ports
- a second terminal device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band is defined.
- the number of subcarriers is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- a precoding matrix selection module configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding in the codebook subset
- the precoding matrix selected by the precoding matrix selection module for all subbands in the N subbands corresponds to at least two first PMIs, and the at least two The matrix corresponding to the first PMI has a different phase relationship, and the precoding matrix selected by the precoding matrix selection module for each of the N subbands respectively corresponds to a second PMI;
- the reporting module is configured to report the first PMI and the second PMI corresponding to the precoding matrix selected by the precoding matrix selection module.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used to indicate that the precoding matrix selection module is the second PMI from the at least two first PMIs. a first PMI selected by the corresponding subband, the second information being a second precoding matrix index of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions number.
- the coding matrix is expressed as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- a third terminal device is used in a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined. The number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- a processor configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is a precoding matrix indicating a PMI, a second PMI, and a third PMI identifier for indicating a phase relationship, where the processor is the same for the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands, The precoding matrix selected by the processor for each of the N subbands corresponds to a second PMI, and the processor is the same for the third PMI corresponding to the precoding matrix selected by all the subbands in the N subbands. ;
- a transmitter configured to report a first PMI corresponding to the precoding matrix selected by the processor, Two PMI and third PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the first possible implementation manner of the third aspect, or the second possible implementation manner of the third aspect, in a third possible implementation manner the first PMI is LTE Rel-10
- subsequent versions are the first precoding matrix index numbers of the precoding matrices in the codebook defined by the number of antenna ports greater than four.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is a second precoding matrix index number of a precoding matrix in a codebook defined by a number of antenna ports greater than 4 in LTE Rel-10 and later; or
- the second PMI includes first information and second information, where the first information is used to indicate that the processor is from the third PMI a phase value selected for a subband corresponding to the second PMI, where the second information is a precoding matrix in a codebook defined by an antenna port having a number greater than 4 in LTE Rel-10 and later versions Two precoding matrix index numbers.
- A denotes the discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- a fourth terminal device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, in each sub-band The number of subcarriers is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- a processor configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is a precoding matrix indicating a PMI and a second PMI identifier, where the processor selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the at least two first PMIs
- the matrix has different phase relationships, and the processor is each of the N subbands
- the precoding matrices selected by the subbands respectively correspond to a second PMI;
- a transmitter configured to report a first PMI and a second PMI corresponding to the precoding matrix selected by the processor.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used to indicate The first PMI selected by the processor from the at least two first PMIs for the sub-band corresponding to the second PMI, where the second information is LTE Rel-10 and later versions are greater than 4 The second precoding matrix index number of the precoding matrix in the codebook defined by the antenna port.
- the coding matrix is expressed as:
- W WW, where , , ⁇ represents the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- a first type of base station device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, in each sub-band The number of subcarriers is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- a receiving module configured to receive, by the terminal, a first precoding matrix indicating PMI, a second PMI, And a third PMI for indicating a phase relationship, wherein the terminal is the same as the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands, and the terminal is each of the N subbands
- the precoding matrices selected by the subbands respectively correspond to a second PMI, and the terminal is the same as the third PMI corresponding to the precoding matrix selected by all the subbands in the N subbands;
- a precoding matrix determining module configured to determine, according to the received first PMI, the second PMI, and the third PMI, a precoding matrix corresponding to each subband from a preset codebook subset, where the codebook subset
- Each precoding matrix is identified by a first PMI, a second PMI, and a third PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the second PMI is a second precoding matrix index number of a precoding matrix in a codebook defined by a number of antenna ports greater than 4 in LTE Rel-10 and later; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI a phase value selected by the subband corresponding to the second PMI, where the second information is LTE Rel-10 and In the latter version, the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4.
- the precoding matrix corresponding to each subband determined by the precoding matrix determining module is represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , which is a positive integer;
- ⁇ is a number greater than 4 in LTE Rel-10 and later versions a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix And a second precoding matrix index number identifier;
- A denotes the discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- a second base station device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band The number of subcarriers in the medium is greater than 1, and both M and N are positive integers greater than 1, and the base Station equipment includes:
- a receiving module configured to receive, by the terminal, a first precoding matrix indicating a PMI and a second PMI, where the terminal selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and The matrices corresponding to the at least two first PMIs have different phase relationships, and the precoding matrix selected by the terminal for each of the N subbands respectively corresponds to a second PMI;
- the precoding matrix determining module is used for Determining, according to the received first PMI and the second PMI, a precoding matrix corresponding to each subband from a preset codebook subset, where each precoding matrix in the codebook subset is composed of a first PMI and a Two PMI logos.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used to indicate The first PMI selected by the terminal from the at least two first PMIs for the sub-band corresponding to the second PMI, where the second information is LTE Rel-10 and later versions are greater than 4 The second precoding matrix index number of the precoding matrix in the codebook defined by the antenna port.
- the precoding matrix determining module determines The precoding matrix corresponding to each subband is expressed as:
- W WW,; where : 0 X, , ⁇ represents the DFT column vector, ⁇
- a third base station device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band is defined. The number of subcarriers is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- a receiver configured to receive a first precoding matrix indication PMI, a second PMI, and a third PMI for indicating a phase relationship, where the terminal is a preselected for all subbands in the N subbands
- the first PMI corresponding to the coding matrix is the same, and the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI, and the terminal is selected for all subbands in the N subbands.
- the third PMI corresponding to the precoding matrix is the same;
- a processor configured to determine, according to the received first PMI, the second PMI, and the third PMI, a precoding matrix corresponding to each subband from a preset codebook subset, where each of the codebook subsets
- the precoding matrix is identified by a first PMI, a second PMI, and a third PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the second PMI is the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI
- the precoding matrix corresponding to each subband determined by the processor is represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is LTE Rel-10 and later versions are greater than 4 a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- ⁇ ) [ x 0 k j 1, ⁇ , 15 ; ...... AC)] ,
- A denotes the discrete Fourier transform DFT column vector,
- ⁇ denotes the number of antenna ports configured at the same
- a fourth base station device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, in each sub-band The number of subcarriers is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- a receiver configured to receive, by the terminal, a first precoding matrix indicating PMI and a second PMI, where the terminal selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and The matrix corresponding to the at least two first PMIs has a different phase relationship, and the precoding matrix selected by the terminal for each of the N subbands respectively corresponds to a second PMI;
- a processor configured to determine, according to the received first PMI and the second PMI, a precoding matrix corresponding to each subband from a preset codebook subset, where each precoding matrix in the codebook subset is configured by The first PMI and the second PMI identifier.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used to indicate The first PMI selected by the terminal from the at least two first PMIs for the sub-band corresponding to the second PMI, where the second information is LTE Rel-10 and later versions are greater than 4 The second precoding matrix index number of the precoding matrix in the codebook defined by the antenna port.
- the processor determines each The precoding matrix corresponding to the subbands is expressed as
- W WW, where : 0 x. , ⁇ denotes the DFT column vector, ⁇
- a ninth aspect a method for feeding back channel state information in a wireless communication system, wherein the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band The number of subcarriers in the medium is greater than 1, and both M and N are positive integers greater than 1.
- the method includes:
- the terminal selects a precoding matrix from the preset codebook subset for each of the N subbands according to the configured reference signal, where each precoding matrix in the codebook subset is configured by the first precoding matrix. Instructing a PMI, a second PMI, and a third PMI identifier for indicating a phase relationship, where the terminal is the same as the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands, and the terminal is the N
- Each of the sub-bands of the sub-bands has a pre-coding matrix corresponding to a second PMI, and the terminal is the same as the third PMI corresponding to the pre-coding matrix selected by all sub-bands in the N sub-bands;
- part or all of the precoding matrix in the codebook subset is transformed according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase selected from a preset phase set Value; or
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the first possible implementation manner of the ninth aspect, or the second possible implementation manner of the ninth aspect, in a third possible implementation manner the first PMI is LTE Rel-10
- subsequent versions are the first precoding matrix index numbers of the precoding matrices in the codebook defined by the number of antenna ports greater than four.
- the second PMI is a second precoding matrix index number of a precoding matrix in a codebook defined by a number of antenna ports greater than 4 in LTE Rel-10 and later; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI
- the selected phase value of the subband corresponding to the second PMI, where the second information is the second of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions Precoding matrix index number.
- part or all of the precoding matrix in the codebook subset is represented as:
- ⁇ represents a phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer; ⁇ is a pre-code in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to the first precoding matrix index number of the coding matrix, where is the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions Corresponding matrix, where LTE Rel-10 and later versions are greater than 4
- the precoding matrix in the codebook defined by the antenna port is identified by the first precoding matrix index number and the second precoding matrix index number;
- A denotes the discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- a tenth aspect a method for feeding back channel state information in a wireless communication system, wherein the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band The number of subcarriers in the band is greater than 1, and both M and N are positive integers greater than 1.
- the method includes:
- the terminal selects a precoding matrix from the preset codebook subset for each of the N subbands according to the configured reference signal, where each precoding matrix in the codebook subset is configured by the first precoding matrix. Instructing the PMI and the second PMI identifier, the precoding matrix selected by the terminal for all subbands in the N subbands corresponds to at least two first PMIs, and the matrix corresponding to the at least two first PMIs has different phases a relationship, the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI;
- the terminal reports the first PMI and the second PMI corresponding to the selected precoding matrix.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set.
- the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is a subband corresponding to the second PMI from the at least two first PMIs.
- the selected first PMI, the second information is a second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the coding matrix is expressed as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- the eleventh aspect a method for receiving channel state information in a wireless communication system, wherein the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band The number of subcarriers in the band is greater than 1, and both M and N are positive integers greater than 1.
- the method includes:
- a first precoding matrix indication PMI for indicating a phase relationship
- the terminal is corresponding to a precoding matrix selected by all subbands in the N subbands
- the first PMI is the same
- the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI
- the terminal corresponds to a precoding matrix selected by all subbands in the N subbands.
- the third PMI is the same;
- the matrix is identified by a first PMI, a second PMI, and a third PMI.
- the part of the codebook subset Or all precoding matrices are obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is in the Long Term Evolution LTE version Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the third PMI is a phase vector comprising at least two phase values, the at least two phase values being selected from a pre-configured set of phases.
- the first PMI is LTE
- the first precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in Rel-10 and later versions.
- the second PMI if the third PMI is a phase value selected from a preset phase set, the second PMI a second precoding matrix index number of a precoding matrix in a codebook defined for an antenna port having a number greater than 4 in LTE Rel-10 and later; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI
- the precoding matrix corresponding to each subband determined by the base station is represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents a phase value corresponding to the third PMi, and PH ', p L ] is a positive integer;
- ⁇ is a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions
- ⁇ is LTE Rel-10 and later versions a matrix corresponding to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4, where LTE Rel-10 and later versions are defined by a number of antenna ports greater than 4
- A denotes the discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- a twelfth aspect a method for receiving channel state information in a wireless communication system, wherein the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-bands are defined, and each sub-band The number of subcarriers in the band is greater than 1, and both M and N are positive integers greater than 1.
- the method includes:
- the base station receives the first precoding matrix indicating the PMI and the second PMI, where the terminal selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the at least two The matrices corresponding to the first PMIs have different phase relationships, and the precoding matrix selected by the terminal for each of the N subbands respectively corresponds to a second PMI;
- part or all of the precoding matrix in the codebook subset is transformed according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set Obtained, wherein the first codebook is a codebook defined by a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later versions.
- the second PMI includes first information and second information, where the first information is used by The first PMI selected by the terminal from the at least two first PMIs for the sub-band corresponding to the second PMI, where the second information is LTE Rel-10 and the number of subsequent versions is greater than The second precoding matrix index number of the precoding matrix in the codebook defined by the antenna port of 4.
- the base station determines each The precoding matrix corresponding to the subbands is expressed as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- the precoding matrix selected by the terminal for each of the N subbands in the wireless communication system is composed of a first PMI, a second PMI, and a third PMI identifier for indicating phase correlation. , because a third PMI for representing phase correlation is introduced, so that the precoding matrix selected for different subbands can simultaneously control the beam in the horizontal and vertical directions; or
- the precoding matrix selected by the terminal for all the subbands of the N subbands corresponds to at least two first PMIs, and the matrix corresponding to the at least two first PMIs has different phase relationships, so that the terminal is selected for different subbands.
- the coding matrix is capable of controlling the beam in both horizontal and vertical directions.
- FIG. 1A is a schematic diagram showing a manner of placing a uniform linear array of 2 antenna ports and 4 antenna ports in an LTE system
- 1B is a schematic diagram of a placement manner of cross-polarization of a 2-antenna port, a 4-antenna port, and an 8-antenna port in an LTE system;
- FIG. 2 is a schematic diagram of horizontal beams corresponding to different precoding matrices in an LTE system
- FIG. 3 is a schematic diagram of a horizontal and vertical two-dimensional antenna configuration in an LTE system
- FIG. 4 is a schematic diagram of a beam formed by configuring a two-dimensional antenna port in an LTE system
- FIG. 5 is a schematic flowchart of a method for feeding back channel state information in a first type of wireless communication system according to the present invention
- FIG. 6 is a schematic flowchart of a method for feeding back channel state information in a second wireless communication system according to the present invention
- FIG. 7 is a schematic flowchart of a method for receiving channel state information in a first type of wireless communication system according to the present invention.
- FIG. 8 is a schematic flowchart of a method for receiving channel state information in a second wireless communication system according to the present invention.
- FIG. 9 is a schematic diagram of a first terminal device provided by the present invention.
- FIG. 10 is a schematic diagram of a second terminal device provided by the present invention.
- FIG. 11 is a schematic diagram of a third terminal device provided by the present invention.
- FIG. 12 is a schematic diagram of a fourth terminal device provided by the present invention.
- FIG. 13 is a schematic diagram of a first type of base station device provided by the present invention.
- FIG. 14 is a schematic diagram of a second base station device provided by the present invention.
- FIG. 15 is a schematic diagram of a third base station device provided by the present invention.
- FIG. 16 is a schematic diagram of a fourth base station device according to the present invention. detailed description
- the embodiment of the present invention processes some or all of the precoding matrices in the codebook defined by the number of antenna ports greater than 4 in the LTE version Rel-10 and later versions, so that different precoding matrices have different phases.
- the resulting precoding matrix is capable of controlling the beam in the horizontal and vertical directions.
- the technical solution provided by the present invention is applicable to an LTE system and an evolved system of an LTE system (such as an LTE-A system).
- the wireless terminal can communicate with one or more core networks via a radio access network (eg, RAN, Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and with a mobile terminal
- RAN Radio Access Network
- the computers for example, can be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
- a wireless terminal may also be called a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, User Device, or User Equipment.
- a base station in the present invention may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
- the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
- IP Internet Protocol
- the base station can also coordinate attribute management of the air interface.
- the base station may be an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE.
- a precoding matrix in a codebook defined by an antenna port of a number greater than 4 in the LTE version Rel-10 is described, where each precoding matrix in the codebook is indexed by a first precoding matrix and a second Precoding matrix index number identification, see the 3GPP TS76.213 protocol for details.
- the precoding matrix with a rank of 1 in the codebook of the 8-antenna port defined in the LTE version Rel-10 is shown in the following table.
- the code matrix index number and the second precoding matrix index number are the code matrix index number and the second precoding matrix index number.
- 0 X is a 4 ⁇ matrix consisting of 4 discrete Fourier transform (DFT) column vectors, ⁇ is a positive integer greater than 1, representing the number of DFT vectors; can be interpreted as defined in LTE version Rel-10
- ⁇ is a column selection matrix, and the column is selected from the matrix, which is the rank of the matrix ⁇ 1 , "is the adjustment amount of the phase adjustment for each column selected.
- the wireless communication system is a multi-carrier system, wherein the wireless communication system has M subcarriers, and N is defined. Sub-bands, the number of sub-carriers in each sub-band is greater than 1, and M and N are positive integers greater than 1, the method includes:
- the terminal selects, according to the configured reference signal, a precoding matrix from the preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is configured by the first PMI, the second PMI.
- a third PMI identifier used to indicate a phase relationship, where the terminal is the same as the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands, and the terminal is a precoding matrix selected for each of the N subbands.
- the terminal is the same for the third PMI corresponding to the precoding matrix selected by all the subbands in the N subbands.
- the reference signal involved in S51 is pre-configured, and the terminal performs channel estimation according to the reference signal, and selects one precoding from the preset codebook subset for each of the N subbands according to the setting criterion.
- the matrix is reported to the base station for reference.
- the setting criterion may be a channel capacity maximum criterion, or a Recommended Transport Block Size (TBS) maximum criterion.
- TBS Recommended Transport Block Size
- the present invention does not limit the manner in which the terminal selects one precoding matrix from a preset codebook subset for each of the N subbands.
- the terminal reports the first PMI, the second PMI, and the third corresponding to the selected precoding matrix.
- the precoding matrix selected by the terminal for each of the N subbands in the wireless communication system is used by the first PMI, the second PMI, and the third PMI identifier for indicating phase correlation.
- the third PMI representing the phase correlation enables the precoding matrix selected for the different subbands to simultaneously control the beam in the horizontal and vertical directions.
- part or all of the precoding matrix in the codebook subset involved in S51 is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, where the first code This is the codebook defined for the number of antenna ports greater than 4 in the LTE version Rel-10 and later.
- the third PMI specifically includes the following two preferred representations: Mode 1, the third PMI is a phase value selected from a preset set of phases.
- the first PMI is the first precoding matrix index number (ie) of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the second PMI is a second precoding matrix index number (i.e., 1 ⁇ 2) of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the third PMI is a phase vector containing at least two phase values selected from a pre-configured phase set.
- the first PMI is a first precoding matrix index number (ie) of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the second PMI includes the first information and the second information, where the first information is used to indicate a phase value selected by the terminal from the third PMI for the sub-band corresponding to the second PMI, and the second information is LTE.
- the second precoding matrix index number i.e., 2
- the first information in the second PMI indicates the phase value in the third PMI corresponding to the precoding matrix
- the second information is LTE Rel-10 and
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same, so that the channel is uniformly quantized.
- the phase set is
- the interval between two adjacent phases is; for example, the phase set is 0,1, ⁇ ⁇ ⁇ , ⁇ -1 , and the interval between two adjacent phases is .
- phase intervals of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is a non-uniform hook distribution.
- the phase set is the phase
- some or all of the precoding matrices in the codebook subset are represented as:
- W f ⁇ W 1 )W 2 Equation 1;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;], which is a positive integer;
- ⁇ is the number in LTE Rel-10 and later versions is greater than
- ⁇ is the codebook defined by the antenna port of the number greater than 4 in LTE Rel-10 and later versions.
- a matrix corresponding to the second precoding matrix index number of the precoding matrix wherein the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is used by the first precoding matrix
- A denotes a discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- the first PMI, the second PMI, and the third PMI reported by the terminal in the embodiment of the present invention are described below in conjunction with the foregoing manners 1 and 2.
- the first PMI is a first precoding matrix index number of a precoding matrix in a codebook defined by an antenna port having a number greater than 4 in LTE Rel-10 and subsequent versions
- the second PMI is In the LTE Rel-10 and later versions, the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4, the third PMI corresponding to, wherein the corresponding according to the first PMI Corresponding to the third PMI, a matrix / ( ⁇ , / ⁇ ) can be obtained, and then a precoding matrix is obtained by f corresponding to f ⁇ w x and the second PMI.
- the precoding matrices on all subbands have the same f(w, ⁇ ), and then according to ⁇ corresponding to each subband, A precoding matrix corresponding to each subband.
- the rank precoding matrix is fed back terminal 1
- the set of values of codebook subset and a precoding matrix corresponding to LTE Rel-10 and 2 and 8 after the antenna codebook version is the same and, for beta]
- ⁇ 1 j -1 __/' ⁇ five sub-bands are defined in the wireless communication system.
- the value of the first PMI fed back by the terminal is 0, and the corresponding one is:
- the value of the second PMI fed back by the terminal for each subband is 0, 1, 2, 3, 4, then the second The corresponding ⁇ of the PMI are:
- each element 0,1, ⁇ , /-1 in the vector represented by the third PMI generates a matrix / ( ⁇ ) from the matrix corresponding to the first PMI, thus generating KI ⁇ 2) matrices;
- the second precoding matrix index number is then obtained according to the matrix / ( ) and the corresponding 2 of the second information to obtain a corresponding precoding matrix on the subband.
- the first PMI corresponding to the precoding matrix in the codebook subset is the same as the 8 antenna codebook in LTE Rel-10 and later versions
- the second PMI The second information corresponding to 2 is the same as the 8-antenna codebook in LTE Rel-10 and later versions
- the vector represented by the third PMI is ⁇ [1,7], [-1,- ], [-7 , 1] ⁇
- the first information included in the second PMI is 1 bit, which is used to select a phase value in the vector represented by the third PMI.
- the wireless communication system defines five sub-bands, and the value of the first PMI that the terminal feeds back for all sub-bands is 0, the first PMI corresponds to:
- the phase value in the vector represented by the third , " 2 represents the first information of the second ,, that is, the index number; a third ⁇ of the UE feedback, the vector represented by [ ', -1].
- the second PMI information of "2 2 are represented by: a subband
- the precoding matrices corresponding to each subband determined are:
- some or all of the precoding matrices in the codebook subset in the embodiment of the present invention may be obtained by subtracting the precoding matrix obtained by the above formula 1 according to the foregoing embodiment, so that the codebook subset can be reduced.
- the number of precoding matrices reduces the overhead of feedback.
- the corresponding ⁇ is: 1 o 0 0
- This method is applicable to a scene where the distance between two antenna ports that are polarized and in the same horizontal direction is large, for example, the distance between two antenna ports is 4A, which is a wavelength.
- the wireless communication system is a multi-carrier system, wherein the wireless communication system has M subcarriers, and defines N Sub-bands, the number of sub-carriers in each sub-band is greater than 1, and M and N are positive integers greater than 1.
- the method includes:
- the terminal selects, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is configured by the first PMI and the second a PMI identifier, the precoding matrix selected by the terminal for all subbands of the N subbands corresponds to at least two first PMIs, and the matrix corresponding to the at least two first PMIs has different phase relationships, and the terminal is N subbands
- the precoding matrix selected by each subband corresponds to a second PMI;
- the terminal reports the first PMI and the second PMI corresponding to the selected precoding matrix.
- the precoding matrix selected by the terminal for all subbands in the N subbands corresponds to at least two first PMIs, and the matrix corresponding to the at least two first PMIs has different phase relationships, so that the terminal is
- the precoding matrices selected by the different subbands are capable of controlling the beam in the horizontal and vertical directions.
- part or all of the precoding matrix in the codebook subset involved in S61 is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, where the first code This is a codebook defined for a number of antenna ports greater than 4 in the Long Term Evolution LTE version Rel-10 and later.
- phase intervals of two adjacent phase values in the phase set are the same.
- phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set. It is non-uniformly distributed.
- the second PMI includes the first information and the second information, where the first information is used to indicate the first PMI selected by the terminal from the at least two first PMIs for the sub-band corresponding to the second PMI,
- the second information is the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- some or all of the precoding matrices in the codebook subset are represented as:
- W WW, Equation 2; where , ⁇ denotes the DFT column vector, ⁇
- the second PMI includes two pieces of information, where the first information is used to select one of the at least two first PMIs fed back from the terminal, and the second information is LTERel-10 and subsequent versions.
- the rank of the precoding matrix fed back by the terminal is 1, the set of values is ⁇ 1 J -1 -Jj , and the bandwidth of the wireless communication system corresponds to 5 subbands.
- the terminal feeds back two first PMIs, and the corresponding ones of the first PMI are:
- the DFT vectors in the two are the same, the different values are;
- the first information of the second PMI is 1 bit used to select one from the two ⁇
- part or all of the precoding matrix in the codebook subset in the embodiment of the present invention may be obtained by subtracting the precoding matrix obtained by the foregoing formula 2, thereby reducing the codebook subset.
- the number of precoding matrices reduces the overhead of feedback.
- the beam corresponding to the four DFT column vectors of A in the above formula 2 is set as a beam with a large pitch, as follows: 0, l, ..., 31
- the wireless communication system is a multi-carrier system, wherein the wireless communication system has M subcarriers, and defines N The number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the method corresponds to the first feedback method on the terminal side shown in FIG. 5, as shown in FIG.
- the method includes:
- the base station receives the first PMI, the second PMI, and the third PMI that is used to indicate the phase relationship, where the terminal is the same as the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands.
- the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI, and the terminal is the same as the third PMI corresponding to the precoding matrix selected by all the subbands in the N subbands;
- the base station selects from the preset codebook according to the received first PMI, the second PMI, and the third PMI.
- the precoding matrix corresponding to each subband is respectively determined in the subset, wherein each precoding matrix in the codebook subset is identified by the first PMI, the second PMI, and the third PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, the first codebook being a Long Term Evolution LTE version Rel- The codebook defined for the number of antenna ports greater than 4 in versions 10 and later.
- the third PMI specifically includes the following two preferred representation manners: Mode 1.
- the third PMI is a phase value selected from a preset set of phases.
- the first PMI is the first precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the second PMI is a second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the third PMI is a phase vector containing at least two phase values selected from a pre-configured phase set.
- the first PMI is the first precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the second PMI includes the first information and the second information, where the first information is used to indicate a phase value selected by the terminal from the third PMI for the sub-band corresponding to the second PMI, and the second information is LTE.
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same.
- phase intervals of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is a non-uniform hook distribution.
- the precoding matrix corresponding to each subband determined by the base station is represented as:
- W f ⁇ W 1 ) W 2 Equation 1;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is the number greater than the number in LTE Rel-10 and later versions
- ⁇ is the codebook defined by the antenna port of the number greater than 4 in LTE Rel-10 and later versions.
- A denotes the discrete Fourier transform DFT column vector
- ⁇ denotes the number of antenna ports configured at the same horizontal position
- the embodiment of the present invention corresponds to the first feedback method on the terminal side shown in FIG. 5, and the repeated description is not repeated. For details, refer to the first feedback method on the terminal side.
- the wireless communication system is a multi-carrier system, wherein the wireless communication system has M subcarriers, and defines N subbands, the number of subcarriers in each subband is greater than 1, and M and N are positive integers greater than one; the method corresponds to the second feedback method on the terminal side shown in FIG. 6, as shown in FIG. Show that the method includes: 581.
- the base station receives the first PMI and the second PMI that are reported by the terminal, where the precoding matrix selected by the terminal for all subbands in the N subbands corresponds to at least two first PMIs, and the matrix corresponding to the at least two first PMIs Having different phase relationships, the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI;
- the base station determines, according to the received first PMI and the second PMI, a precoding matrix corresponding to each subband from a preset codebook subset, where each precoding matrix in the codebook subset is configured by the first PMI. And the second PMI logo.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, the first codebook being a long term evolution
- the LTE version Rel-10 and later versions are codebooks defined for a number of antenna ports greater than four.
- the second PMI includes the first information and the second information, where the first information is used to indicate that the terminal selects the first PMI selected from the at least two first PMIs for the sub-band corresponding to the second PMI.
- the second information is a second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the precoding matrix corresponding to each subband determined by the base station is represented as:
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- the embodiment of the present invention corresponds to the second feedback method on the terminal side shown in FIG. 6 , and the repeated description is not repeated. For details, refer to the second feedback method on the terminal side.
- the first terminal device provided by the embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system There are M subcarriers in the system, and N subbands are defined. The number of subcarriers in each subband is greater than 1, and M and N are positive integers greater than 1.
- the terminal device includes:
- a precoding matrix selection module 91 configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each preamble in the codebook subset
- the coding matrix is identified by a first PMI, a second PMI, and a third PMI for indicating a phase relationship
- the precoding matrix selection module 91 is a first PMI corresponding to a precoding matrix selected by all subbands in the N subbands.
- the precoding matrix selection module 91 selects a precoding matrix selected for each of the N subbands to correspond to a second PMI, and the precoding matrix selection module 91 is all the children in the N subbands.
- the third PMI corresponding to the selected precoding matrix is the same; the reporting module 92 is configured to report the first PMI, the second PMI, and the third PMI corresponding to the precoding matrix selected by the precoding matrix selection module 91.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- the third PMI specifically includes the following two preferred representations:
- the third PMI is a phase value selected from a pre-configured phase set (refer to the above manner 1 and will not be described here); or
- the third PMI is a phase vector including at least two phase values, and the at least two phase values are selected from a pre-configured phase set (refer to the above mode 2, and details are not described herein again).
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same, so that the channel is uniformly quantized.
- the phase intervals of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniformly distributed.
- the first PMI is the first precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is defined by an antenna port of a number greater than 4 in LTE Rel-10 and subsequent versions. a second precoding matrix index number of the precoding matrix in the codebook; or
- the second PMI includes first information and second information, where the first information is used to indicate that the precoding matrix selection module 91 is from the a phase value selected by the sub-band corresponding to the second PMI in the third PMI, where the second information is a pre-defined in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions The second precoding matrix index number of the coding matrix.
- some or all of the precoding matrices in the codebook subset are represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is LTE Rel-10 and later versions are greater than 4 a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- ⁇ ) [ x 0 k j 1, ⁇ , 15 ; ...... AC)] ,
- A denotes the discrete Fourier transform DFT column vector,
- ⁇ denotes the number of antenna ports configured at the same
- the first terminal device provided by the embodiment of the present invention corresponds to the feedback method of the channel state information in the first type of wireless communication system shown in FIG. 5, and the specific implementation is shown in FIG. The feedback method of channel state information in the wireless communication system will not be repeated here.
- a second terminal device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N sub-identifiers are defined.
- the number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- a precoding matrix selection module 101 configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each preamble in the codebook subset
- the coding matrix is identified by the first PMI and the second PMI, and the precoding matrix selection module 101 selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the at least two a matrix corresponding to a PMI has a different phase relationship, and the precoding matrix selected by the precoding matrix selection module 101 for each of the N subbands respectively corresponds to a second PMI;
- the reporting module 102 is configured to report the first PMI and the second PMI corresponding to the precoding matrix selected by the precoding matrix selection module 101.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- phase intervals of two adjacent phase values in the phase set are the same.
- phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set. It is non-uniformly distributed.
- the second PMI includes first information and second information, where the first information is used to indicate that the precoding matrix selection module 101 is the second PMI from the at least two first PMIs. a first PMI selected by the corresponding subband, the second information being a second precoding matrix index of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions number.
- part or all of the precoding matrix in the codebook subset is represented as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- the second terminal device provided by the embodiment of the present invention corresponds to the feedback method of the channel state information in the second wireless communication system shown in FIG. 6 , and the specific implementation is shown in the second manner shown in FIG. 6 .
- the feedback method of channel state information in the wireless communication system will not be repeated here.
- the first terminal device and the second terminal device may be two independent terminal devices, or may be integrated into one terminal device, and according to the representation form of the precoding matrix, select different functional modules into N subbands in the wireless communication system.
- Each subband selects a precoding matrix.
- the terminal device selects the precoding matrix for each of the N subbands in the wireless communication system by using the precoding matrix selecting module 91 in FIG.
- a third terminal device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N is defined. The number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- the processor 111 is configured to select, according to the configured reference signal, a precoding matrix from a preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is configured by a first PMI, a second PMI, and a third PMI identifier for indicating a phase relationship, where the processor 111 is the same as the first PMI corresponding to the precoding matrix selected by all the subbands in the N subbands, the processor The precoding matrix selected by each of the N subbands corresponds to a second PMI, and the processor 111 is the same as the third PMI corresponding to the precoding matrix selected by all the subbands in the N subbands. ;
- the transmitter 112 is configured to report the first PML second PMI and the third PMI corresponding to the precoding matrix selected by the processor 111.
- the processor 111 and the transmitter 112 are connected by a bus.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- the third PMI specifically includes the following two preferred representations:
- the third PMI is a phase value selected from a pre-configured phase set (refer to the above manner 1 and will not be described here); or
- the third PMI is a phase vector including at least two phase values, and the at least two phase values are selected from a pre-configured phase set (refer to the above mode 2, and details are not described herein again).
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same, so that the channel is uniformly quantized.
- the phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniform Evenly distributed.
- the first PMI is a first precoding matrix index number of a precoding matrix in a codebook defined by antenna ports greater than 4 in LTE Rel-10 and later versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is defined by an antenna port of a number greater than 4 in LTE Rel-10 and subsequent versions. a second precoding matrix index number of the precoding matrix in the codebook; or
- the second PMI includes first information and second information, where the first information is used to indicate that the processor 111 is from the third PMI a phase value selected by the sub-band corresponding to the second PMI, where the second information is a precoding matrix in a codebook defined by an antenna port of a number greater than 4 in LTE Rel-10 and later versions The second precoding matrix index number.
- some or all of the precoding matrices in the codebook subset are represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is LTE Rel-10 and later versions are greater than 4 a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- ⁇ ) [ x 0 k j 1, ⁇ , 15 ; ...... AC)] ,
- A denotes the discrete Fourier transform DFT column vector,
- ⁇ denotes the number of antenna ports configured at the same
- the third terminal device provided by the embodiment of the present invention corresponds to the feedback method of the channel state information in the first type of wireless communication system shown in FIG. 5, the specific implementation is shown in the first type shown in FIG. The feedback method of channel state information in the wireless communication system will not be repeated here.
- a fourth terminal device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M subcarriers, and N sub-identifiers are defined.
- the number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the terminal device includes:
- the processor 121 is configured to select, according to the configured reference signal, a precoding matrix from the preset codebook subset for each of the N subbands, where each precoding matrix in the codebook subset is configured by a first PMI and a second PMI identifier, the processor 121 selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the matrix corresponding to the at least two first PMIs has a matrix Different pre-coding matrices selected by the processor 121 for each of the N sub-bands respectively correspond to a second PMI;
- the transmitter 122 is configured to report the first PMI and the second PMI corresponding to the precoding matrix selected by the processor 121.
- the processor 121 and the transmitter 122 are connected by a bus.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- phase intervals of two adjacent phase values in the phase set are the same.
- phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set. It is non-uniformly distributed.
- the second PMI includes first information and second information, where the first information is used to indicate that the processor 121 is the child corresponding to the second PMI from the at least two first PMIs.
- the second information is a second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- part or all of the precoding matrix in the codebook subset is represented as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- the matrix corresponding to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4.
- the fourth terminal device provided by the embodiment of the present invention corresponds to the feedback method of the channel state information in the second wireless communication system shown in FIG. 6, the specific implementation is shown in the second manner shown in FIG. The feedback method of channel state information in the wireless communication system will not be repeated here.
- the first terminal device and the second terminal device may be two independent terminal devices, or may be integrated into one terminal device, and according to the representation form of the precoding matrix, select different functional modules into N subbands in the wireless communication system. Each subband selects a precoding matrix.
- the terminal device uses the processor 111 in FIG. 11 to select a precoding matrix for each of the N subbands in the wireless communication system, and uses FIG.
- the transmitter 122 reports the first PMI, the second PMI, and the third PMI corresponding to the selected precoding matrix to the base station; if the precoding matrix is represented by the formula 2, the terminal device uses the processor 121 in FIG.
- a precoding matrix is selected for each of the N subbands in the wireless communication system, and the first PMI and the second PMI corresponding to the selected precoding matrix are used by the transmitter 122 in FIG.
- a first base station device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, where the wireless communication system is There are M subcarriers, and N subbands are defined. The number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- the receiving module 131 is configured to receive a first PMI, a second PMI, and a third PMI for indicating a phase relationship, where the terminal is configured by using a precoding matrix selected by all subbands in the N subbands.
- the first PMI is the same, and the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI, and the terminal is a precoding matrix selected by all subbands in the N subbands.
- the corresponding third PMI is the same;
- the precoding matrix determining module 132 is configured to determine, according to the first PMI, the second PMI, and the third PMI received by the receiving module 131, a precoding matrix corresponding to each subband from the preset codebook subset, where Each precoding matrix in the codebook subset is identified by a first PMI, a second PMI, and a third PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- the third PMI specifically includes the following two preferred representations:
- the third PMI is a phase value selected from a pre-configured phase set (refer to the foregoing mode 1 for details, and details are not described herein); or
- the third PMI is a phase vector including at least two phase values, and the at least two phase values are selected from a pre-configured phase set (refer to the foregoing mode 2, and details are not described herein again).
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same, so that the channel is uniformly quantized.
- the phase intervals of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniformly distributed.
- the first PMI is a first precoding matrix index number of a precoding matrix in a codebook defined by an antenna port whose number is greater than 4 in LTE Rel-10 and subsequent versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is defined by an antenna port of a number greater than 4 in LTE Rel-10 and subsequent versions. a second precoding matrix index number of the precoding matrix in the codebook; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI
- the precoding matrix corresponding to each subband determined by the precoding matrix determining module 132 is represented as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is LTE Rel-10 and later versions are greater than 4 a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- ⁇ ) [ x 0 k j 1, ⁇ , 15 ; ...... AC)] ,
- A denotes the discrete Fourier transform DFT column vector,
- ⁇ denotes the number of antenna ports configured at the same
- the first base station device provided by the embodiment of the present invention corresponds to the method for receiving channel state information in the first type of wireless communication system shown in FIG. 7, and the specific implementation is shown in FIG. The method of receiving channel state information in a wireless communication system will not be repeated here.
- a second base station device is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N is defined.
- the number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- the receiving module 141 is configured to receive the first PMI and the second PMI that are reported by the terminal, where the terminal selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the at least The matrix corresponding to the two first PMIs has a different phase relationship, and the precoding matrix selected by the terminal for each of the N subbands respectively corresponds to a second PMI;
- a precoding matrix determining module 142 configured to determine, according to the first PMI and the second PMI received by the receiving module 141, a precoding matrix corresponding to each subband from a preset codebook subset, where the codebook subset Each precoding matrix is identified by a first PMI and a second PMI.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- phase intervals of two adjacent phase values in the phase set are the same.
- phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniformly distributed.
- the second PMI includes first information and second information, where the first information is used in a table.
- the precoding matrix corresponding to each subband determined by the precoding matrix determining module 142 is represented as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- ⁇ corresponds to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions matrix.
- the second base station device provided by the embodiment of the present invention corresponds to the method for receiving channel state information in the second wireless communication system shown in FIG. 8 , and the specific implementation is as shown in FIG. 8 .
- the method of receiving channel state information in a wireless communication system will not be repeated here.
- the first base station device and the second base station device may be two independent base station devices, or may be integrated into one base station device, and according to the representation form of the precoding matrix, select different functional modules into N subbands in the wireless communication system.
- Each subband selects a precoding matrix.
- the precoding matrix is represented by Equation 1
- the base station device receives the first PMI for all subbands, the second PMI for each subband, and all for the sub-bands reported by the terminal.
- the base station device receives the at least one first PMI for all subbands and the second PMI for each subband reported by the terminal, and uses the precoding matrix determination module 142 in FIG. 14 from the receiving module 141 in FIG.
- the preset codebook subset respectively determines a precoding matrix corresponding to each subband.
- a third base station device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, where the wireless communication system is There are M subcarriers, and N subbands are defined. The number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- the receiver 151 is configured to receive a first PMI, a second PMI, and a third PMI, which are used to indicate a phase relationship, where the terminal corresponds to a precoding matrix selected by all subbands in the N subbands.
- the first PMI is the same, and the precoding matrix selected by the terminal for each of the N subbands corresponds to a second PMI, and the terminal is a precoding matrix selected by all subbands in the N subbands.
- the corresponding third PMI is the same;
- the processor 152 is configured to determine, according to the first PMI, the second PMI, and the third PMI received by the receiver 151, a precoding matrix corresponding to each subband from a preset codebook subset, where the codebook is Each precoding matrix of the set is identified by a first PMI, a second PMI, and a third PMI.
- the receiver 151 and the processor 152 are connected by a bus.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- the third PMI specifically includes the following two preferred representations:
- the third PMI is a phase value selected from a pre-configured phase set (refer to the foregoing mode 1 for details, and details are not described herein); or
- the third PMI is a phase vector including at least two phase values, and the at least two phase values are selected from a pre-configured phase set (refer to the foregoing mode 2, and details are not described herein again).
- the pre-configured phase set contains J elements, each element corresponding to a different phase value, and J is a positive integer.
- the phase intervals of two adjacent phase values in the phase set are the same, so that the channel is uniformly quantized.
- the phase intervals of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniformly distributed.
- the first PMI is a first precoding matrix index number of a precoding matrix in a codebook defined by an antenna port whose number is greater than 4 in LTE Rel-10 and subsequent versions.
- the third PMI is a phase value selected from a pre-configured phase set
- the second PMI is defined by an antenna port of a number greater than 4 in LTE Rel-10 and subsequent versions. a second precoding matrix index number of the precoding matrix in the codebook; or
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is from the third PMI
- the precoding matrix corresponding to each subband determined by the processor 152 is expressed as:
- W f ⁇ W 1 )W 2 ;
- ⁇ represents the phase value corresponding to the third PMI, PH -, p L ;] , is a positive integer;
- ⁇ is LTE Rel-10 and later versions are greater than 4 a matrix corresponding to the first precoding matrix index number of the precoding matrix in the codebook defined by the antenna port,
- ⁇ is a preamble in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions a matrix corresponding to a second precoding matrix index number of the coding matrix, where the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions is indexed by the first precoding matrix
- ⁇ ) [ x 0 k j 1, ⁇ , 15 ; ...... AC)] ,
- A denotes the discrete Fourier transform DFT column vector,
- ⁇ denotes the number of antenna ports configured at the same
- the third base station device provided by the embodiment of the present invention corresponds to the method for receiving channel state information in the first type of wireless communication system shown in FIG. 7 , and the specific implementation is shown in FIG. 7 .
- the method of receiving channel state information in a wireless communication system will not be repeated here.
- a fourth base station device provided by an embodiment of the present invention is applied to a wireless communication system, where the wireless communication system is a multi-carrier system, wherein the wireless communication system has M sub-carriers, and N is defined.
- the number of subcarriers in each subband is greater than 1, and both M and N are positive integers greater than 1.
- the base station device includes:
- the receiver 161 is configured to receive, by the terminal, the first PMI and the second PMI, where the terminal selects at least two first PMIs for the precoding matrix selected by all the subbands in the N subbands, and the at least The matrix corresponding to the two first PMIs has a different phase relationship, and the precoding matrix selected by the terminal for each of the N subbands respectively corresponds to a second PMI;
- the processor 162 is configured to determine, according to the first PMI and the second PMI received by the receiver 161, a precoding matrix corresponding to each subband from a preset codebook subset, where each of the codebook subsets
- the precoding matrix is identified by a first PMI and a second PMI.
- the receiver 161 and the processor 162 are connected by a bus.
- part or all of the precoding matrix in the codebook subset is obtained according to a precoding matrix in the first codebook and a phase value in a preconfigured phase set, wherein the first codebook is long-term.
- the codebook defined for the number of antenna ports greater than 4 in the evolved LTE version Rel-10 and later.
- the phase intervals of two adjacent phase values in the phase set are the same.
- the phase spacing of two adjacent phase values in the phase set may also be different, that is, the phase in the phase set is non-uniformly distributed.
- the second PMI includes first information and second information, where the first information is used to indicate that the terminal is a sub-band corresponding to the second PMI from the at least two first PMIs.
- the first PMI is selected, and the second information is a second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4 in LTE Rel-10 and later versions.
- the precoding matrix corresponding to each subband determined by the processor 162 is expressed as:
- W WW, where ⁇ denotes the DFT column vector, ⁇
- the matrix corresponding to the second precoding matrix index number of the precoding matrix in the codebook defined by the number of antenna ports greater than 4.
- the fourth base station device provided by the embodiment of the present invention corresponds to the method for receiving channel state information in the second wireless communication system shown in FIG. 8 , and the specific implementation is as shown in FIG. 8 .
- the method of receiving channel state information in a wireless communication system will not be repeated here.
- the third base station device and the fourth base station device may be two independent base station devices, or may be integrated into one base station device, and according to the representation form of the precoding matrix, select different functional modules into N subbands in the wireless communication system.
- Each subband selects a precoding matrix.
- the base station device receives the first PMI for all subbands, the second PMI for each subband, and all for the sub-reports reported by the terminal.
- the third PMI of the subband, and the processor 152 in FIG. 15 respectively determines the precoding matrix corresponding to each subband from the preset codebook subset; if the precoding matrix is represented by the formula 2, the base station device
- the receiver 161 in FIG. 16 receives at least one first PMI for all subbands and a second PMI for each subband reported by the terminal, and uses the processor 162 in FIG. 16 from the preset codebook subset.
- the precoding matrix corresponding to each subband is determined separately.
- embodiments of the invention may be provided as a method, system, or Computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of one or more computer program products embodied on a computer-usable storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.) in which computer usable program code is embodied.
- a computer-usable storage medium including but not limited to disk storage, CD-ROM, optical storage, etc.
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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KR1020177004702A KR102004622B1 (ko) | 2014-07-29 | 2014-07-29 | 채널 상태 정보의 피드백 및 수신 방법 및 디바이스 |
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CN108631847B (zh) | 2017-03-24 | 2021-06-01 | 华为技术有限公司 | 传输信道状态信息的方法、终端设备和网络设备 |
CN108111200A (zh) * | 2017-06-16 | 2018-06-01 | 中兴通讯股份有限公司 | 一种信道状态信息反馈的方法和装置 |
CN108111211B (zh) * | 2017-08-11 | 2021-11-02 | 中兴通讯股份有限公司 | 信道状态信息的反馈方法、装置及管理设备 |
JP7135073B2 (ja) * | 2017-09-07 | 2022-09-12 | エルジー エレクトロニクス インコーポレイティド | 無線通信システムにおいてコードブックに基づいて上向きリンク信号を送信する方法及びこのための装置 |
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KR102004622B1 (ko) | 2019-07-26 |
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