WO2017157082A1 - 一种csi反馈方法、预编码方法、终端及基站 - Google Patents

一种csi反馈方法、预编码方法、终端及基站 Download PDF

Info

Publication number
WO2017157082A1
WO2017157082A1 PCT/CN2016/113160 CN2016113160W WO2017157082A1 WO 2017157082 A1 WO2017157082 A1 WO 2017157082A1 CN 2016113160 W CN2016113160 W CN 2016113160W WO 2017157082 A1 WO2017157082 A1 WO 2017157082A1
Authority
WO
WIPO (PCT)
Prior art keywords
csi
resource
precoding matrix
port
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/113160
Other languages
English (en)
French (fr)
Inventor
陈文洪
高秋彬
李辉
陈润华
拉盖施
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Academy of Telecommunications Technology CATT
Original Assignee
China Academy of Telecommunications Technology CATT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Academy of Telecommunications Technology CATT filed Critical China Academy of Telecommunications Technology CATT
Priority to JP2018549253A priority Critical patent/JP6692447B2/ja
Priority to US16/086,009 priority patent/US10790890B2/en
Priority to EP16894241.5A priority patent/EP3432482B1/en
Priority to KR1020187030196A priority patent/KR102146438B1/ko
Priority to EP23154544.3A priority patent/EP4195521A1/en
Publication of WO2017157082A1 publication Critical patent/WO2017157082A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478Special codebook structures directed to feedback optimisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617Diversity 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048Allocation of pilot signals, i.e. of signals known to the receiver

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a CSI feedback method, a precoding method, a terminal, and a base station.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • Technology is evolving toward high data rates, low latency, and optimized packet data applications.
  • the multi-antenna MIMO (Multiple Input Multiple-Output) technology of the physical layer has become one of the key technologies of the current mobile communication system.
  • the multi-antenna technology has many advantages, such as the use of multiple antennas for space division multiplexing to increase the system. The capacity is increased by the multiplexing gain of multiple antennas to increase the throughput of the system.
  • the base station obtains a certain CSI (Channel State Information) (which may be an instantaneous value or a short-term or medium-term statistical information), the power and rate of each data stream can be loaded by a certain pre-processing method. Optimized even in the direction of transmission, and it is possible to pre-empt some or all of the interference between data streams in the terminal by pre-processing to obtain better performance.
  • CSI Channel State Information
  • the embodiment of the invention provides a CSI feedback method, a precoding method, a terminal and a base station, which are used to improve the matching degree between CSI and channel state.
  • a CSI feedback method including:
  • the terminal selects, according to the downlink channel information, a CSI-RS resource or a CSI-RS port on the compliant sub-band from the channel state information measurement pilot CSI-RS resource set configured by the base station; the terminal is configured according to the selected CSI-RS resource or a CSI-RS port, and a precoding matrix set corresponding to the selected CSI-RS resource or CSI-RS port, performing channel quality indication CQI measurement; wherein the precoding matrix set includes one or more precoding matrices, One physical resource on the compliant subband corresponds to one precoding matrix in the precoding matrix set; the terminal feeds back the CQI and the indication information of the selected CSI-RS resource or CSI-RS port.
  • the terminal performs CQI measurement according to the selected CSI-RS resource or CSI-RS port, and a precoding matrix set corresponding to the selected CSI-RS resource or the selected CSI-RS port, including: The terminal performs CQI measurement according to the downlink channel information and the precoding matrix corresponding to the physical resources in the agreed subband, where The precoding matrix is a precoding matrix in the selected CSI-RS resource or a precoding matrix set corresponding to the selected CSI-RI port.
  • the terminal performs CQI measurement according to the selected CSI-RS resource and a precoding matrix set corresponding to the selected CSI-RS resource, including:
  • the terminal performs CQI measurement on the downlink channel information corresponding to each selected CSI-RS resource according to the precoding matrix set, to obtain a CQI corresponding to each CSI-RS resource; or the terminal selects each selected one.
  • the downlink channel information corresponding to the CSI-RS resource is combined, and CQI measurement is performed on the combined downlink channel information according to the precoding matrix set, to obtain a joint CQI corresponding to the selected multiple CSI-RS resources.
  • the terminal performs CQI measurement according to the selected CSI-RS port and a precoding matrix set corresponding to the selected CSI-RS port, including:
  • the terminal performs CQI measurement on the downlink channel information corresponding to the selected CSI-RS port according to the precoding matrix set, and obtains a CQI corresponding to the selected CSI-RS port; or the CSI configured by the terminal according to the base station.
  • the downlink channel information corresponding to the RS resource and the precoding matrix set corresponding to the selected CSI-RS port perform CQI measurement, and obtain a CQI corresponding to the selected CSI-RS port.
  • the terminal selects a CSI-RS resource or a CSI-RS port on the compliant subband from the CSI-RS resource set configured by the base station based on the predetermined RI and downlink channel information.
  • the terminal determines, according to the RI, the selected CSI-RS resource or the number of CSI-RS ports.
  • the RI is an RI that is last fed back by the terminal; or the RI is indicated by the base station to the terminal.
  • the terminal selects, according to the downlink channel information, the CSI-RS resource or the CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station, including:
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of all CSI-RS ports included in the CSI-RS resource configured by the base station by the selected CSI-RS port; or
  • the indication information of the selected CSI-RS port is an index of the precoding matrix set corresponding to the selected CSI-RS port in the predefined codebook.
  • the precoding matrix set corresponding to the selected CSI-RS resource is pre-agreed by the terminal and the base station.
  • the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of a column selection vector or a column selection vector group, where one element in the column selection vector is 1, and other elements are Or 0; or a set of precoding matrices corresponding to the selected CSI-RS port is obtained according to a column selection vector and a phase set, or according to a column selection vector group and a phase set, the phase set including one or more phases A factor, based on a phase factor, yields a precoding matrix in a set of precoding matrices.
  • one column vector of the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of M column selection vectors, and M is equal to the number of selected CSI-RS ports.
  • the port corresponding to the element having the value 1 in the M column selection vectors constitutes the selected CSI-RS port, and M is an integer greater than or equal to 1.
  • the process of obtaining the precoding matrix set according to a column selection vector and a phase set, or according to a column selection vector group and a phase set, comprising: a phase matrix obtained based on a phase factor and the column selection vector or
  • the Kronecker product operation is performed on the column selection vector in the selection vector group, and the column vector in the matrix obtained by the operation constitutes a precoding matrix.
  • the compliant subband includes one or more physical resource blocks PRB.
  • the physical resource is a resource unit RE, a sub-carrier, a physical resource block, a PRB, or a PRB set; or the physical resource is an RE, a sub-carrier, a PRB, or a PRB set for transmitting data symbols.
  • the second aspect provides a terminal, where the terminal includes: a selecting module, configured to select, according to the downlink channel information, a CSI-RS resource or a CSI on the compliant subband from the channel state information measurement pilot CSI-RS resource set configured by the base station according to the downlink channel information.
  • a selecting module configured to select, according to the downlink channel information, a CSI-RS resource or a CSI on the compliant subband from the channel state information measurement pilot CSI-RS resource set configured by the base station according to the downlink channel information.
  • a measurement module configured to perform channel quality indication CQI measurement according to the selected CSI-RS resource or CSI-RS port, and a precoding matrix set corresponding to the selected CSI-RS resource or CSI-RS port;
  • the precoding matrix set includes one or more precoding matrices, and one physical resource on the compliant subband corresponds to one precoding matrix in the precoding matrix set, and a feedback module is configured to feed back the CQI and indication information of the selected CSI-RS resource or CSI-RS port.
  • the measurement module is specifically configured to perform CQI measurement according to downlink channel information and a precoding matrix corresponding to physical resources in the agreed subband, where the precoding matrix is the selected CSI-RS resource. Or a precoding matrix in the precoding matrix set corresponding to the selected CSI-RI port.
  • the selecting module selects from a channel state information measurement pilot CSI-RS resource set configured by the base station.
  • the CSI-RS resource is configured on the sub-band; the measurement module is specifically configured to perform CQI measurement on the downlink channel information corresponding to each selected CSI-RS resource according to the precoding matrix set, to obtain each CSI- The CQI corresponding to the RS resource; or combining the downlink channel information corresponding to each selected CSI-RS resource, and performing CQI measurement on the combined downlink channel information according to the precoding matrix set, to obtain the selected multiple CSIs- The joint CQI corresponding to the RS resource.
  • the selecting module selects a CSI-RS port on the compliant sub-band from the channel state information measurement pilot CSI-RS resource set configured by the base station; the measurement module is specifically configured to: according to the precoding matrix set, Performing CQI measurement on the downlink channel information corresponding to the selected CSI-RS port to obtain a CQI corresponding to the selected CSI-RS port; or selecting downlink channel information corresponding to the CSI-RS resource configured by the base station, and the selected The CQI measurement is performed on the precoding matrix set corresponding to the CSI-RS port, and the CQI corresponding to the selected CSI-RS port is obtained.
  • the selecting module is specifically configured to: select, according to the predetermined RI and downlink channel information, a CSI-RS resource or a CSI-RS port on the compliant subband from the CSI-RS resource set configured by the base station.
  • the selecting module is specifically configured to: determine, according to the RI, a selected CSI-RS resource or a CSI-RS port number.
  • the RI is an RI that is last fed back by the terminal; or the RI is indicated by the base station to the terminal.
  • the selection module is specifically configured to:
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of all CSI-RS ports included in the CSI-RS resource configured by the base station by the selected CSI-RS port; or
  • the indication information of the selected CSI-RS port is an index of the precoding matrix set corresponding to the selected CSI-RS port in the predefined codebook.
  • the precoding matrix set corresponding to the selected CSI-RS resource is pre-agreed by the terminal and the base station.
  • the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of a column selection vector or a column selection vector group, where one element in the column selection vector is 1, and other elements are Is 0; or
  • the precoding matrix set corresponding to the selected CSI-RS port is obtained according to a column selection vector and a phase set, or according to a column selection vector group and a phase set, the phase set includes one or more phase factors, based on A phase factor yields a precoding matrix in a set of precoding matrices.
  • one column vector of the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of M column selection vectors, and M is equal to the number of selected CSI-RS ports.
  • the port corresponding to the element having the value 1 in the M column selection vectors constitutes the selected CSI-RS port, and M is an integer greater than or equal to 1.
  • the process of obtaining the precoding matrix set according to a column selection vector and a phase set, or according to a column selection vector group and a phase set, comprising: a phase matrix obtained based on a phase factor and the column selection vector or
  • the Kronecker product operation is performed on the column selection vector in the selection vector group, and the column vector in the matrix obtained by the operation constitutes a precoding matrix.
  • the compliant subband includes one or more physical resource blocks PRB.
  • the terminal first selects a CSI-RS resource or a CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station, and then selects the selected CSI-RS resource or CSI-RS port.
  • the plurality of precoding matrices in the corresponding precoding matrix set are used for CQI measurement as a precoding matrix on different physical resources in the subband, and the CQI obtained by the feedback measurement and the indication information of the selected CSI-RS resource or CSI-RS port are fed back. .
  • the corresponding precoding matrix CQI measurement is used for different physical resources in the compliant subband, and the CSI and channel state can be improved compared with the CQI measurement based on only one precoding matrix in the prior art.
  • the degree of matching is the degree of matching.
  • a precoding method is provided to improve the degree of matching between precoded data and channel state.
  • An embodiment of the present invention provides a precoding method, including: receiving, by a base station, a channel quality indicator CQI fed back by a terminal, and indicating information of a CSI-RS resource or a CSI-RS port on the selected compliant subband; Determining, according to the CQI, a modulation and coding mode of the downlink transmission; the base station determining, according to the selected CSI-RS resource or the indication information of the CSI-RS port, the corresponding precoding matrix set and the beamforming vector; The base station pre-codes the data transmitted on the physical resources on the agreed sub-band according to the determined precoding matrix set and the beamforming vector to improve the matching degree between the pre-coded data and the channel state.
  • the corresponding precoding matrix set and the beamforming vector are determined by the base station according to the indication information of the CSI-RS resource or the CSI-RS port on the selected compliant subband.
  • Decoding, by the base station, the data transmitted on the physical resource on the agreed subband according to the determined precoding matrix set and the beamforming vector including: the base station determining the determined first precoding matrix Performing, by the precoding matrix in the set, the determined beamforming vector to obtain a second precoding matrix set for performing precoding; wherein the second precoding matrix set includes one or more precodings a matrix, the one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set; the base station according to the second precoding matrix corresponding to the physical resource on the compliant subband A precoding matrix in the set precodes data transmitted on the physical resources on the agreed subband.
  • the corresponding precoding matrix set and the beamforming vector are determined by the base station according to the indication information of the CSI-RS port on the selected compliant subband; the base station is configured according to the determined precoding matrix.
  • each column selection vector corresponds to one CSI-RS port
  • the second precoding matrix set includes one or more precoding matrices
  • one physical resource on the compliant subband corresponds to the second precoding a precoding matrix in the matrix set
  • M is an integer greater than or equal to 1
  • the base station according to the second precoding matrix corresponding to the physical resource on the agreed subband
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of all selected CSI-RS ports included in the CSI-RS resource configured by the base station, or the selected CSI-RS port.
  • the indication information is an index of a precoding matrix set corresponding to the selected CSI-RS port in a predefined codebook.
  • a fourth aspect provides a base station, including: a receiving module, configured to receive a channel quality indication CQI fed back by the terminal, and CSI-RS resources or indication information of a CSI-RS port on the selected compliant subband.
  • the first determining module is configured to determine, according to the CQI, a modulation and coding manner of the downlink transmission.
  • a second determining module configured to determine a corresponding precoding matrix set and a beamforming vector according to the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant subband.
  • a precoding module for determining the precoding matrix set and the beamforming vector according to the determined The data transmitted on the physical resources on the subband is precoded.
  • the corresponding precoding matrix set and the beamforming vector are determined by the second determining module according to the indication information of the CSI-RS resource or the CSI-RS port on the selected compliant subband.
  • the precoding module is specifically configured to: calculate a precoding matrix in the determined first precoding matrix set and the determined beamforming vector to obtain a second precoding matrix for performing precoding a set, wherein the second precoding matrix set includes one or more precoding matrices, and one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set; Precoding the precoding matrix in the second precoding matrix set corresponding to the physical resource on the subband, precoding the data transmitted on the physical resource on the agreed subband.
  • the corresponding precoding matrix set and the beamforming vector are determined by the second determining module according to the indication information of the CSI-RS port on the selected compliant subband.
  • the precoding module is specifically configured to: replace each column selection vector in the precoding matrix in the determined precoding matrix set with a beamforming vector corresponding to each column selection vector, respectively, to obtain Performing a precoding second precoding matrix set; wherein, one column vector in one precoding matrix is composed of M column selection vector concatenations, each column selection vector corresponding to one CSI-RS port, and the second pre- Included in the coding matrix set, one or more precoding matrices, where one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set, and M is an integer greater than or equal to 1; Precoding the precoding matrix in the second precoding matrix set corresponding to the physical resource on the subband, and precoding the data transmitted on the physical resource on the agreed subband.
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of all selected CSI-RS ports included in the CSI-RS resource configured by the base station, or the selected CSI-RS port.
  • the indication information is an index of a precoding matrix set corresponding to the selected CSI-RS port in a predefined codebook.
  • the base station when the base station performs the precoding process, the corresponding precoding matrix set and the beamforming vector are determined according to the selected CSI-RS resource or the indication information of the CSI-RS port fed back by the terminal, and then determined according to the Corresponding precoding matrix sets and beamforming vectors precode the data transmitted on the physical resources on the agreed subband.
  • the base station performs precoding on each physical resource according to the precoding matrix corresponding to the physical resource according to the precoding matrix in the precoding matrix set, and is based on only one precoding in the prior art.
  • the precoded data can be better matched with the channel state; on the other hand, the CSI-RS sent by the base station for different CSI-RS resources or CSI-RS ports uses different beams.
  • the base station may determine a corresponding beamforming vector according to the CSI-RS resource or the indication information of the CSI-RS port fed back by the terminal, by using corresponding beamforming on different physical resources.
  • the vector and the precoding matrix are precoded, and the degree of matching between the precoded data and the channel state is further improved, thereby ensuring downlink transmission performance.
  • FIG. 1 is a schematic structural diagram of a MIMO system with a single user as an example in the prior art
  • FIG. 2 is a schematic diagram of a transmission structure based on a CSI-RS measurement mechanism in the prior art
  • FIG. 3 is a schematic flowchart of a CSI feedback process according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a precoding process according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a terminal according to another embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a base station according to another embodiment of the present invention.
  • FIG. 1 shows a structural block diagram of a MIMO system with a single user as an example.
  • the transmitting end (such as a base station) and the receiving end (such as a terminal) have multiple antennas.
  • the input serial code stream is converted into several parallel independent sub-streams through a series of pre-processing (such as modulation, coding, weighting, mapping), and transmitted through different transmitting antennas.
  • the antenna group not less than the number of transmitting antennas is used for receiving, and the multi-channel received signal is processed in the spatial domain and the time domain by using a certain coding relationship between the estimated channel transmission characteristics and the transmitted sub-code stream, thereby Several sub-transmission sub-streams are separated and converted into serial data output.
  • the increase in capacity causes the interference to increase accordingly.
  • the system capacity of the MIMO is maximized. Precoding techniques are introduced in the technology.
  • the LTE Rel-8 system introduces closed-loop precoding technology to improve spectral efficiency.
  • Closed-loop precoding requires the base station and the terminal to store the same set of precoding matrices, called a codebook. After estimating the channel information according to the common pilot of the cell, the terminal selects a precoding matrix from the codebook according to a certain criterion, and feeds the index of the precoding matrix in the codebook to the base station through the uplink channel, and the index is recorded as PMI. (Precoding Matrix Indicator, precoding matrix indicator). The base station determines the precoding matrix used by the base station according to the received PMI.
  • the terminal also reports the corresponding RI (Rank Indicator) and CQI (Performing Quality Indicator) to report the number of codewords, the number of transmission layers, and the codewords of the downlink transmission.
  • RI Rank Indicator
  • CQI Combined Quality Indicator
  • the LTE network supports more antenna ports (such as 8 antennas).
  • the pilot structure has undergone corresponding changes.
  • the downlink pilot is divided into a DMRS (Demodulation Reference Signal) and a CSI-RS (Channel State Information Measurement Pilot) for demodulation and channel measurement, respectively, where the CSI-RS is used.
  • DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information Measurement Pilot
  • the terminal needs to generate the CQI, PMI or RI report information according to the measurement of the CSI-RS.
  • FIG. 2 shows a wireless network structure based on a current CSI-RS measurement mechanism, including a base station 201 and a terminal 202 and a wireless link 203. Both the terminal 202 and the base station 201 have multiple antennas.
  • the terminal 202 performs CSI (Channel State Indication) measurement according to the CSI-RS sent by the base station 201, and feeds the measured CSI to the base station 201 through the radio link 203.
  • the CSI may include an indication between the base station and the terminal. CQI of the radio communication channel quality, one or more of a PMI indicating a preferred precoding matrix for shaping the transmitted signal, an RI indicating the number of useful transport layers of the preferred data channel of the terminal, and an estimate of the channel coefficient information.
  • the base station 201 selects a precoding matrix and a modulation and coding scheme for downlink data transmission according to the CSI fed back by the terminal 202.
  • the CSI fed back by the terminal 202 enables the base station 201 to adaptively configure an appropriate transmission scheme to improve coverage, or user data transmission rate, or More accurate prediction channel quality is used for future transmissions to terminal 202.
  • the embodiment of the present invention provides a CSI feedback solution.
  • This scheme can be applied to downlink MIMO transmission scenarios.
  • the terminal when performing CSI measurement, the terminal selects a CSI-RS resource or a CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station, which is equivalent to selecting a beamforming vector (or beam).
  • Subband The frequency domain granularity unit of the physical layer feedback channel information in the LTE system.
  • the system bandwidth can be divided into several sub-bands.
  • the sub-band size may be multiple PRBs of 4, 6, or 8.
  • the sub-band can be configured to include one or more PRBs (Physical Resource Blocks), or the width of the sub-bands is the system bandwidth.
  • PRBs Physical Resource Blocks
  • the bandwidth size can be pre-agreed by the terminal and the base station.
  • CSI-RS resource used to indicate a complete set of CSI-RS resource configuration parameters, such as CSI-RS port number, period, starting position, pilot structure type, and sub-frame position identifier.
  • the CSI-RS signal is shaped by the CSI-RS signal on the configured CSI-RS resource, and then sent to the terminal, where different CSI-RS resources can be shaped by using different beamforming weights.
  • a CSI-RS resource can be configured with multiple CSI-RS ports.
  • the number of CSI-RS ports in a CSI-RS resource can be 2, 4 or 8.
  • the CSI-RS signal is shaped by the CSI-RS signal on the configured CSI-RS resource and then sent to the terminal.
  • the different CSI-RS ports can be shaped by using different beamforming weights.
  • CSI-RS port group A plurality of CSI-RS ports configured for one CSI-RS resource are grouped in a packet manner to obtain a CSI-RS port group, and the CSI-RS port group includes at least one CSI-RS port.
  • the grouping manner may be notified by the base station to the terminal or the base station and the terminal in advance.
  • the base station sends the CSI-RS signal to the terminal after being shaped by the beam on the configured CSI-RS resource, where different CSI-RS port groups can be shaped by different beamforming weights, and the same CSI Different CSI-RS ports within the RS port group can be shaped with the same beamforming weights.
  • the terminal divides the N CSI-RS ports configured in the CSI-RS resource into N/2 groups, each group of two CSI-RS ports, where the i-th CSI-RS port group includes The CSI-RS port index is ⁇ i, i+N/2 ⁇ .
  • different physical resources may be different time-frequency resources, different frequency domain resources, or different time-frequency resource combinations.
  • the physical resource in the bandwidth is set to be an RE (Resource Element), a subcarrier, a PRB, or a PRB set, or may be an RE, a subcarrier, a PRB, or a PRB set for transmitting data symbols.
  • FIG. 3 is a schematic flowchart diagram of a CSI feedback method provided by an embodiment of the present invention, and the process may be implemented by a terminal.
  • the process includes the following steps:
  • Step 301 The terminal measures the pilot CSI-RS resource from the channel state information configured by the base station according to the downlink channel information.
  • the CSI-RS resource or the CSI-RS port on the compliant subband is selected in the set.
  • the base station first sends the CSI-RS resource configuration information to the terminal. Specifically, the base station sends the CSI-RS signal to the terminal after being shaped by the beam on the configured CSI-RS resource.
  • Different CSI-RS resources, different ports in one CSI-RS resource, different port groups in one CSI-RS resource, or different port groups in different CSI-RS resources may use different beamforming weights. Forming.
  • the CSI-RS resource set configured by the base station includes four CSI-RS resources, and each CSI-RS resource is shaped by using different beamforming weights, and then the terminal performs CSI-RS resources configured by the base station through step 301.
  • the process of selecting a CSI-RS resource in a set is equivalent to the process of selecting a beam.
  • the CSI-RS resource set configured by the base station includes one CSI-RS resource configured with eight CSI-RS ports, and each CSI-RS port in the CSI-RS resource uses different beamforming weights.
  • the process of selecting a CSI-RS port from the CSI-RS resources configured by the base station by the terminal in step 301 is also equivalent to the process of selecting a beam.
  • the CSI-RS resource set configured by the base station includes one CSI-RS resource configured with eight CSI-RS ports, and eight CSI-RS ports in the CSI-RS resource are divided into four CSI-RS ports. Groups, each CSI-RS port group is shaped by using different beamforming weights, and the process of selecting a CSI-RS port group by the terminal (ie, selecting multiple CSI-RS ports) is also equivalent to selecting a beam. process.
  • the CSI-RS resource set configured by the base station includes four CSI-RS resources configured with eight CSI-RS ports, and the CSI-RS ports in each CSI-RS resource are divided into four CSI-RS port groups.
  • Each CSI-RS resource is shaped by different beamforming weights, and the CSI-RS port group in each CSI-RS resource is also shaped by different beamforming weights, that is, 16 CSIs.
  • the RS port group is shaped by 16 different beamforming weights, and the process of selecting the CSI-RS resource and the CSI-RS port group (ie, selecting multiple CSI-RS ports) by the terminal in step 301 is equivalent to The process of selecting a beam.
  • a shaped CSI-RS port can be mapped to a part of the antenna unit, or can be mapped to all antenna units.
  • one CSI-RS port in a CSI-RS port group containing two CSI-RS ports is mapped to all antenna units corresponding to one polarization direction, and the other CSI-RS port is mapped to another polarization direction.
  • the base station has a total of four antennas, and one CSI-RS resource includes four CSI-RS ports.
  • the CSI-RS ports are divided into two groups, and the CSI-RS ports included in the two CSI-RS groups are included.
  • the mapping relationship between the CSI-RS port and the antenna unit can be as shown in FIG. 4.
  • the shaping matrix W i,j represents the shaping weight used by the CSI-RS port of the i-th CSI-RS port group on the j-th antenna unit in the polarization direction of the CSI-RS port.
  • Each CSI-RS port is shaped to transmit a CSI-RS signal on the physical resources of the respective port.
  • the terminal may obtain the downlink channel information according to the CSI-RS signal sent by the base station, and may further select the CSI-RS resource or the CSI-RS port on the agreed sub-band from the CSI-RS resource set configured by the base station according to the downlink channel information.
  • the terminal may select, according to the predetermined RI and downlink channel information, a CSI-RS resource or a CSI-RS port on the compliant subband from the CSI-RS resource set configured by the base station.
  • the terminal may determine the selected CSI-RS resource or the number of CSI-RS ports according to the predetermined RI.
  • the RI may be the RI that the terminal last feedbackd; or the base station indicates to the terminal.
  • the terminal selecting the CSI-RS resource or the CSI-RS port in step 301 may include the following situations:
  • the CSI-RS resource set configured by the base station includes multiple CSI-RS resources, and the terminal selects one or more CSI-RS resources on the compliant sub-band from the CSI-RS resource set configured by the base station (ie, from all One or more CSI-RS resources are selected in the CSI-RS resource).
  • the CSI-RS resource set configured by the base station includes one CSI-RS resource configured with multiple ports, and the terminal is configured from the CSI-RS resource set configured by the base station (that is, the CSI-RS resource configured with multiple ports) Medium) Select one or more CSI-RS ports on the compliant subband (ie, select one or more CSI-RS ports from all CSI-RS ports).
  • the CSI-RS resource set configured by the base station includes a CSI-RS resource configured with multiple ports, and the ports are grouped according to the grouping manner, and the terminal is configured from the CSI-RS resource set configured by the base station (that is, the configuration) Selecting one or more CSI-RS port groups on the compliant sub-band in the CSI-RS resources with multiple CSI-RS ports (ie, selecting multiple CSI-RS ports on the compliant sub-band from all CSI-RS ports) ).
  • the CSI-RS resource set configured by the base station includes multiple CSI-RS resources each configured with multiple ports, and the ports in each CSI-RS resource are grouped according to the grouping manner, and the terminal is configured from the base station. Selecting one or more CSI-RS resources on the compliant subband and one or more CSIs in each CSI-RS resource in the CSI-RS resource set (ie, multiple CSI-RS resources configured with multiple ports) - RS port group (ie, select multiple CSI-RS ports on the compliant subband from all CSI-RS ports).
  • the terminal selects the CSI-RS resource or CSI on the compliant sub-band from the CSI-RS resource set configured by the base station.
  • the specific case of the RS port can be divided into two types: the terminal selects the CSI-RS resource on the compliant sub-band from all the CSI-RS resources in the CSI-RS resource set configured by the base station, or the CSI configured by the terminal from the base station.
  • the CSI-RS ports on the compliant subband are selected among all CSI-RS ports in the RS resource set.
  • the terminal may select the CSI configured from the base station according to the downlink channel information in the following manner. - Select the CSI-RS resource on the agreed subband in the RS resource set:
  • the terminal determines, according to the downlink channel information corresponding to the CSI-RS resource in the CSI-RS resource set configured by the base station, the transmission performance information corresponding to the CSI-RS resource configured by the base station, and then according to the determined CSI-RS resource. Transmitting the performance information, selecting a CSI-RS resource on the compliant subband from the CSI-RS resource set configured by the base station;
  • the terminal determines the transmission performance information corresponding to the CSI-RS resource configured by the base station according to the result of the calculation of the precoding matrix set and the downlink channel information corresponding to the CSI-RS resource in the CSI-RS resource set configured by the base station, and then determines the transmission performance information corresponding to the CSI-RS resource configured by the base station, and then And selecting, according to the determined transmission performance information corresponding to the CSI-RS resource, the CSI-RS resource on the agreed sub-band from the CSI-RS resource set configured by the base station.
  • the precoding matrix set corresponding to the CSI-RS resource may be pre-agreed by the terminal and the base station.
  • the terminal and the base station may be pre-configured with the same codebook including multiple precoding matrix sets, where the terminal may select the number of CSI-RS ports included in each CSI-RS resource selected, or all selected CSI-
  • the total number of CSI-RS ports included in the RS resource, and the current number of transmission layer (Rank) assumptions determine the corresponding set of precoding matrices.
  • the number of rows of the precoding matrix in the precoding matrix set is equal to the number of CSI-RS ports included in each CSI-RS resource selected, or the total number of CSI-RS ports included in all selected CSI-RS resources;
  • the number of columns in the encoding matrix is equal to the current number of transmission layer (Rank) assumptions.
  • an example of a precoding matrix set corresponding to a CSI-RS resource For example, an example of a precoding matrix set corresponding to a CSI-RS resource:
  • the terminal may determine the number of selected CSI-RS resources based on the predetermined RI.
  • the number of selected CSI-RS resources is determined according to any one of the following rules: the number of selected CSI-RS resources is equal to the downlink transmission layer number Rank indicated by the RI, and each selected CSI-RS resource performs CSI The sum of the measured Rank is equal to the Rank indicated by the RI, and the lower channel information corresponding to the selected CSI-RS resource is combined, and the assumed RaN is equal to the Rank indicated by the RI.
  • the CSI-RS resource set configured by the base station includes one CSI-RS resource configured with multiple CSI-RS ports, the terminal selects one or more CSI-RS ports from all CSI-RS ports), and the terminal is configured according to
  • the CSI-RS port on the compliant subband can be selected from the CSI-RS resource set configured by the base station by:
  • the terminal determines, according to the downlink channel information corresponding to the CSI-RS port in the CSI-RS resource set configured by the base station, the transmission performance information corresponding to the CSI-RS port configured by the base station, and then according to the determined CSI-RS port. Transmitting performance information, selecting a CSI-RS port on the compliant subband from a set of CSI-RS resources configured by the base station;
  • the terminal determines the transmission performance information corresponding to the CSI-RS port configured by the base station according to the calculation result of the precoding matrix set and the downlink channel information corresponding to the CSI-RS port in the CSI-RS resource set configured by the base station, and then determines the transmission performance information corresponding to the CSI-RS port configured by the base station, and then And selecting, according to the determined transmission performance information corresponding to the CSI-RS port, a CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station.
  • the precoding matrix set corresponding to the CSI-RS port may be pre-agreed by the terminal and the base station.
  • the terminal and the base station may be pre-configured with the same predefined codebook including multiple precoding matrix sets, where the terminal may be based on the selected number of CSI-RS ports and the current number of transmission layers (Rank) assumptions. Determine the corresponding set of precoding matrices.
  • the predefined codebook may also be generated by the terminal according to a predefined rule:
  • the precoding matrix in the precoding matrix set corresponding to the CSI-RS port may be composed of a column selection vector e i or a column selection vector group ⁇ e i ⁇ , where the column selection vector e i is the ith element is 1 other A vector with elements of 0.
  • the CSI-RS port corresponding to the element with the value 1 in the M column selection vectors constitutes a CSI-RS port, and M is an integer greater than or equal to 1.
  • the number of CSI-RS ports included in one CSI-RS port group is equal to the number of column selection vectors included in one column vector of the precoding matrix corresponding to the CSI-RS port group. Taking each column selection vector in a precoding matrix set A port corresponding to an element having a value of 1 constitutes a CSI-RS port (one or more) corresponding to the precoding matrix set, and therefore, is generated by using a column selection vector or a column selection vector group corresponding to the selected CSI-RS port.
  • the precoding matrix is precoded to implement the CSI-RS port selection function.
  • the precoding matrix is directly composed of the column selection vector group ⁇ e i ⁇ :
  • is a constant (power factor).
  • the precoding matrix in the precoding matrix set corresponding to the CSI-RS port may also be selected by the column selection vector e i and the phase set ⁇ n ⁇ , or by the column selection vector group ⁇ e i ⁇ and the phase set ⁇ ⁇ n ⁇ obtained.
  • the set of phases ⁇ n ⁇ include one or more phase factors ⁇ n, ⁇ n to obtain a phase factor based on a precoding matrix a pre-encoding matrix set.
  • a column selection vector e i , or a column selection vector group ⁇ e i ⁇ and a different phase factor in the phase set can result in different precoding matrices in a precoding set.
  • the set of phases may be pre-agreed by the terminal and the base station.
  • is a constant (power factor) and ⁇ i ⁇ i ⁇ i is a phase factor taken from the phase set ⁇ n ⁇ .
  • the matrix may be based on the phase ⁇ n to obtain a phase factor of said column selection vector e i to select a column or columns ⁇ e i ⁇ is the vector group selection vector e i Kronecker product operation carried out, the resulting matrix arithmetic and The column vectors form a precoding matrix.
  • phase matrix can be or or
  • the precoding matrix consists of a phase matrix And the Kronecker product composition of the column selection vector e i , that is, the precoding matrix in the precoding matrix set is the following matrix or the L matrix is obtained from the following matrix, and L is the current assumed Rank.
  • the terminal may be configured according to the grouping manner.
  • the CSI-RS ports in the CSI-RS resources configured by the base station are grouped, and then the CSI-RS ports are selected according to the result of the grouping.
  • the preferred method is to use one CSI-RS port group as a unit, according to the foregoing The method of selecting a CSI-RS port is correspondingly selected.
  • the terminal may select a CSI-RS resource or a CSI-RS port based on a packet manner configured by the base station or an RI indication configured by the base station. For example, when the RI is 1 or 2, using the grouping method in the foregoing example, each CSI-RS port group includes two CSI-RS ports; when the RI is 3 or 4, the CSI-RS port is divided into N/.
  • the port is divided into N/8 groups, each group has 8 CSI-RS ports, and the terminal can perform Rank>4 transmission based on one CSI-RS port group.
  • the specific procedure may be similar to the foregoing selecting a CSI-RS port.
  • the precoding matrix form in the precoding matrix set corresponding to the CSI-RS port group is (the number of column items in the precoding matrix is 2 columns).
  • the precoding matrix form in the precoding matrix set corresponding to the CSI-RS port group (the multiple CSI-RS ports) is (the number of one column item in the precoding matrix is 4)
  • Column selection vector constitutes):
  • phase factors used in the different row selection vectors in the same row may also be different.
  • the terminal selects the CSI on the agreed subband from the CSI-RS resource set configured by the base station according to the determined transmission performance information corresponding to the CSI-RS resource.
  • the RS resource; or the terminal selects the CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station according to the determined transmission performance information corresponding to the CSI-RS port, which can pass, but is not limited to, the transmission performance.
  • RSRP Reference Signal Receiving Power
  • transport block size For example, a plurality of CSI-RS resources or CSI-RS ports with the largest RSRP are selected, and the specific number can be determined according to the foregoing method according to a predetermined RI.
  • SINR Signal to Interference plus Noise Ratio
  • Step 302 The terminal performs CQI measurement according to the selected CSI-RS resource or CSI-RS port, and a precoding matrix set corresponding to the selected CSI-RS resource or CSI-RS port, where the precoding matrix set includes One or more precoding matrices, one physical resource on the compliant subband corresponding to one precoding matrix in the precoding matrix set.
  • the terminal is based on the selected CSI-RS resource or the CSI-RS port, and the selected CSI-RS resource.
  • the CQI measurement may be performed by the terminal or the precoding matrix set corresponding to the CSI-RS port, where the terminal performs CQI measurement according to the downlink channel information and the precoding matrix corresponding to the physical resources in the subband, where the precoding matrix is The selected CSI-RS resource or the precoding matrix in the precoding matrix set corresponding to the selected CSI-RI port. That is, the terminal may transmit different precoding matrices in the precoding matrix set corresponding to the selected CSI-RS resource or the selected CSI-RS port in the step 302, on the different physical resources in the agreed subband.
  • the terminal may according to the precoding matrix corresponding to each selected CSI-RS resource.
  • the CQI measurement is performed on the downlink channel information corresponding to each selected CSI-RS resource, and the CQI corresponding to each CSI-RS resource is obtained.
  • the terminal may downlink the selected CSI-RS resource.
  • the channel information is combined, and CQI measurement is performed on the combined downlink channel information according to the precoding matrix set, to obtain a joint CQI corresponding to the selected multiple CSI-RS resources.
  • the terminal may combine downlink channel information corresponding to C CSI-RS resources configured with K CSI-RS ports to obtain downlink channel information corresponding to (N ⁇ K) CSI-RS ports, thereby performing CQI measurement.
  • the precoding matrix set corresponding to the selected CSI-RS resource may be pre-agreed by the base station and the terminal. For details, refer to the precoding matrix set corresponding to the CSI-RS resource in the foregoing step 301.
  • the terminal may be configured according to the precoding matrix set corresponding to each selected CSI-RS port.
  • the CQI measurement is performed on the downlink channel information corresponding to the selected CSI-RS port, and the CQI corresponding to the selected CSI-RS port is obtained; or the terminal may use the downlink channel information corresponding to the CSI-RS resource configured by the base station, and the selected CSI.
  • the CQI measurement is performed on the precoding matrix set corresponding to the RS port, and the CQI corresponding to the selected CSI-RS port is obtained. .
  • the precoding matrix set corresponding to the selected CSI-RS port may be pre-agreed by the base station and the terminal, or the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port may be selected by the column.
  • the vector or the column selection vector group is configured, or is obtained according to the column selection vector (or the column selection vector group) and the phase set. For details, refer to the precoding matrix set corresponding to the CSI-RS port in the foregoing step 301 (predefined code) Description of this).
  • the precoding matrix in the precoding matrix set can be recycled on the physical resources in the bandwidth.
  • the terminal may assume that the ith physical resource corresponds to the kth precoding matrix in the precoding matrix set, where:
  • the resource is a unit that recycles the precoding matrix in the precoding matrix set.
  • precoding matrix set If there is only one precoding matrix in the precoding matrix set, it can be assumed that the precoding matrices used by all physical resources in the agreed subband are the same.
  • Step 303 The terminal feeds back the CQI and the indication information of the selected CSI-RS resource or CSI-RS port.
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the terminal uses the index of the selected CSI-RS resource in the CSI-RS resource set as the selected CSI-RS.
  • the indication information is fed back to the base station.
  • the two CSI-RS resources may be indicated by the two-bit information, and the terminal selects one CSI-RS resource from the terminal, and indicates the information by using two bits of information.
  • the CSI-RS resource is selected and fed back. If the terminal selects one or more CSI-RS resources from the terminal, the terminal may separately feed back the indication information corresponding to each selected CSI-RS resource.
  • the terminal may also feed back the selected CSI-RS resource by means of a bitmap bitmap, that is, the selected CSI-RS resource is indicated by a bitmap, and specifically, the bit corresponding to the selected CSI-RS resource in the bitmap may be 1, the other bits are 0.
  • a bitmap bitmap that is, the selected CSI-RS resource is indicated by a bitmap, and specifically, the bit corresponding to the selected CSI-RS resource in the bitmap may be 1, the other bits are 0.
  • the indication information of the selected CSI-RS port is an index of all CSI-RS ports included in the CSI-RS resource configured by the base station of the selected CSI-RS port (method 1); or, the selected CSI- The indication information of the RS port is an index of the precoding matrix set corresponding to the selected CSI-RS port in the predefined codebook (method 2).
  • the terminal selects a CSI-RS port from the CSI-RS resource set configured by the base station in step 301, the selected CSI-RS port is included in all CSI-RS resources configured by the base station.
  • the index in the CSI-RS port is fed back to the base station as indication information of the selected CSI-RS.
  • the two CSI-RS ports may be respectively indicated by 2-bit information, and the terminal selects one CSI-RS port from the terminal, and indicates the information by using 2-bit information.
  • the CSI-RS port is selected and feedback is provided. If the terminal selects more than one CSI-RS port from the terminal, the terminal may respectively feed back the indication information corresponding to each selected CSI-RS port.
  • the terminal may also feed back the selected CSI-RS port by using a bitmap bitmap, that is, The bitmap indicates the selected CSI-RS port, and specifically, the bit corresponding to the selected CSI-RS port on the bitmap is 1, and the other bits are 0.
  • bitmap bitmap indicates the selected CSI-RS port, and specifically, the bit corresponding to the selected CSI-RS port on the bitmap is 1, and the other bits are 0.
  • the terminal After selecting a CSI-RS port from the CSI-RS resource set configured by the base station in step 301, the terminal sets the precoding matrix corresponding to the selected CSI-RS port in a predefined codebook.
  • the index in the data is fed back to the base station as indication information of the selected CSI-RS.
  • a specific codebook refer to the description of the precoding matrix set (predefined codebook) corresponding to the CSI-RS port in the foregoing step 301.
  • the CSI-RS resource set configured by the base station includes eight CSI-RS ports, and the indication information of the selected CSI-RS port is i1, and the precoding matrix in the precoding matrix set indicated by i1
  • the index in the set is i2, and the correspondence between i1 and the precoding matrix set can be as shown in Table 1:
  • the index in the set is i2, and the correspondence between i1 and the precoding matrix set can be specifically as shown in Table 2, Table 3, or Table 4:
  • the index in the set is i2, and the correspondence between i1 and the precoding matrix set may be specifically as shown in Table 5, Table 6, or Table 7:
  • the terminal may separately feed back the CQI and the selected CSI-RS resource or the indication information of the CSI-RS port, or the terminal may also feed back the CQI and the selected CSI-RS resource or the CSI-RS port. Instructions.
  • the terminal performs aperiodic feedback according to the trigger of the base station, and reports the CQI and the indication information of the selected CSI-RS resource or the CSI-RS port in one subframe.
  • the terminal may perform bit concatenation or joint coding on the CQI and the selected CSI-RS resource or the indication information of the CSI-RS port, and feed back to the base station.
  • the embodiment of the present invention provides a CSI feedback solution.
  • the terminal first selects a CSI-RS resource or a CSI-RS port on the compliant sub-band from the CSI-RS resource set configured by the base station, and then selects the selected CSI-RS resource or the CSI-RS port.
  • the plurality of precoding matrices in the precoding matrix set are used as CQI measurements as precoding matrices on different physical resources in the subband, and the measured CQI and the selected CSI-RS resource or the indication information of the CSI-RS port are fed back.
  • the terminal uses the corresponding precoding matrix CQI measurement for different physical resources in the compliant subband based on the precoding matrix set, and can improve the CSI compared with the CQI measurement based on only one precoding matrix in the prior art.
  • the degree of matching with the channel state is not limited to:
  • an embodiment of the present invention further provides a precoding method.
  • FIG. 5 is a schematic flowchart diagram of a precoding method according to still another embodiment of the present invention.
  • the process may be implemented by a base station, and the process includes the following steps:
  • Step 501 The base station receives the channel quality indication CQI fed back by the terminal, and the indication information of the CSI-RS resource or the CSI-RS port on the selected compliant subband.
  • Step 502 The base station determines a modulation and coding mode of the downlink transmission according to the CQI.
  • Step 503 The base station determines a corresponding precoding matrix set and a beamforming vector according to the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant subband.
  • Step 504 The base station pre-codes the data transmitted on the physical resources on the agreed sub-band according to the determined precoding matrix set and the beamforming vector.
  • the base station may determine a modulation and coding mode of the downlink transmission according to the received CQI of the terminal feedback.
  • the base station determines, according to the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant subband.
  • the precoding matrix in the determined first precoding matrix set and the determined beamforming vector may be operated to obtain a precoding a second precoding matrix set; wherein the second precoding matrix set includes one or more precoding matrices, and one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set; And pre-coding the data transmitted on the physical resources on the agreed sub-band according to the pre-coding matrix in the second pre-coding matrix set corresponding to the physical resources on the agreed sub-band.
  • the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant sub-band fed back by the terminal received by the base station in step 501 is the CSI-RS configured by the base station in the selected CSI-RS resource.
  • step 503 the base station according to the CSI-RS resource or the CSI-RS corresponding to the indication information a port, thereby determining a corresponding precoding matrix set, and using the shaping vector used for shaping the CSI-RS resource or the CSI-RS port as a beamforming vector used for downlink transmission in the agreed bandwidth, and then in step 504
  • the base station obtains a precoding matrix set for downlink transmission according to the beamforming vector determined in step 503 and different precoding matrices in the precoding matrix set, and uses the precoding matrix set to physics on the compliant subband
  • the data transmitted on the resource is precoded.
  • the base station performs operations on different precoding matrices in the beamforming vector and the precoding matrix set (which may be represented by the first precoding matrix set in the embodiment of the present invention for convenience of description).
  • the precoding matrix in the precoding matrix set (which may be represented by the second precoding matrix set) is used as a precoding matrix used for transmitting data symbols on different physical resources in the subband, that is, on the agreed subband
  • One physical resource corresponds to one precoding matrix in the second precoding matrix set
  • the base station precodes the data transmitted on the physical resources on the agreed subband according to the second precoding matrix set.
  • This process may be the same as the process of assuming that the precoding matrix used by the data symbols on different physical resources is used when the terminal side measures the CQI.
  • the above operation may be a Kronecker product operation.
  • the first precoding matrix set used in computing the second precoding matrix set for downlink transmission may be the same as the precoding matrix set used by the terminal described in the foregoing terminal side method embodiment when measuring CQI.
  • the shaping vectors used for forming the selected k CSI-RS resources or CSI-RS ports are respectively ⁇ 1 , ⁇ 2 ,..., ⁇ k ⁇
  • finally used for precoding of data transmission Matrix is The base station uses W i as a precoding matrix on the n ⁇ K+i physical resources in the compliant subband.
  • the base station may determine the corresponding precoding matrix set and the beamforming vector according to the indication information of the CSI-RS port on the selected compliant subband, and may perform the precoding matrix in the determined precoding matrix set.
  • Each column selection vector is replaced with a beamforming vector corresponding to each column selection vector, which is obtained for precoding.
  • a second precoding matrix set wherein one column vector in one precoding matrix is composed of M column selection vectors, each column selection vector corresponds to one CSI-RS port, and the second precoding matrix set includes one Or a plurality of precoding matrices, where one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set, and M is an integer greater than or equal to 1: the base station further corresponds to the physical resource on the compliant subband Precoding matrix in the second precoding matrix set, precoding the data transmitted on the physical resources on the agreed subband.
  • the base station determines the precoding matrix set corresponding to the indication information from the predefined codebook according to the indication information, and the base station may use each precoding matrix of the determined precoding matrix set according to the indication information.
  • the column selection vector in the middle obtains the selected CSI-RS port and the corresponding beamforming vector, wherein one column vector in one precoding matrix is composed of M column selection vectors, and each column selection vector corresponds to a CSI-RS port, M is an integer greater than or equal to 1; and in step 504, the base station may replace each column selection vector in the precoding matrix in the precoding matrix set determined in step 503 with a beamforming vector corresponding to each column selection vector, obtaining a second precoding matrix set for performing precoding, and different precoding in the second precoding matrix set Array, as an agreement precoding matrix respectively on different physical resource used for transmitting data symbols within the sub-band.
  • This process may be the same as the process of assuming that the precoding matrix used by the data symbols on different physical resources is used when the terminal side measures the CQI.
  • the precoding matrix set corresponding to the selected CSI-RS port used in the second precoding matrix set for downlink transmission may be specifically compared with the terminal described in the foregoing terminal side method embodiment when measuring CQI.
  • the set of precoding matrices used corresponding to the selected CSI-RS port is the same.
  • the precoding matrix in the precoding matrix set determined according to the CSI-RS port indication information is composed of a column selection vector or a column selection vector group, wherein one element in the column selection vector is 1, and other elements are 0.
  • the phase set includes one or more phase factors, and one precoding in a precoding matrix set is obtained based on one phase factor. matrix.
  • a column vector of the precoding matrix in the precoding matrix set determined according to the CSI-RS port indication information is composed of M column selection vectors, and M is equal to the number of selected CSI-RS ports, The port corresponding to the element having the value 1 in the M column selection vectors constitutes the selected CSI-RS port, and M is an integer greater than or equal to 1.
  • the column selection vector used in one precoding matrix of the precoding matrix set corresponding to the selected CSI-RS port is e k , indicating that the kth CSI-RS resource or the CSI-RS port (or CSI-) is selected.
  • RS port group indicating that the kth CSI-RS resource or the CSI-RS port (or CSI-) is selected.
  • RS port group uses a shaping vector of ⁇ k , and the base station replaces e k in the pre-precoding matrix with ⁇ k
  • a precoding matrix of the precoding matrix set corresponding to the selected CSI-RS port is:
  • the precoding matrix in the second precoding matrix set used by the base station for downlink transmission precoding is:
  • the ith physical resource corresponds to the kth precoding matrix in the second precoding matrix set, where:
  • the agreed sub-band, the physical resource, and the phase set may be the same as the foregoing embodiment, and are not described in detail herein.
  • the base station when the base station performs the precoding process, the corresponding precoding matrix set and the beamforming vector are determined according to the selected CSI-RS resource or the indication information of the CSI-RS port fed back by the terminal, And pre-coding the data transmitted on the physical resources on the agreed sub-band according to the determined corresponding precoding matrix set and the beamforming vector.
  • the base station performs precoding on each physical resource according to the precoding matrix corresponding to the physical resource according to the precoding matrix in the precoding matrix set, and is based on only one precoding in the prior art.
  • the precoded data can be better matched with the channel state; on the other hand, the CSI-RS sent by the base station for different CSI-RS resources or CSI-RS ports uses different beams.
  • the base station may determine a corresponding beamforming vector according to the CSI-RS resource or the indication information of the CSI-RS port fed back by the terminal, by using corresponding beamforming on different physical resources.
  • the vector and the precoding matrix are pre-coded, and the degree of matching between the pre-coded data and the channel state is further improved, thereby ensuring downlink transmission performance, especially in a high-speed scene.
  • Precoding gain which can significantly improve performance compared to traditional MIMO transmission schemes, and enables each data stream to traverse precoding matrices
  • the different column vectors in the data stream so the SINR difference of each data stream is small, further avoiding the problem that the SINR of different data streams corresponding to one codeword is unbalanced.
  • an embodiment of the present invention further provides a terminal.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention, where the terminal can implement a CSI feedback process on the terminal side.
  • the terminal provided by the embodiment of the present invention includes:
  • the selecting module 601 is configured to select, according to the downlink channel information, a CSI-RS resource or a CSI-RS port on the compliant subband from the channel state information measurement pilot CSI-RS resource set configured by the base station;
  • the measuring module 602 is configured to perform channel quality indicator CQI measurement according to the selected CSI-RS resource or CSI-RS port, and a precoding matrix set corresponding to the selected CSI-RS resource or CSI-RS port;
  • the precoding matrix set includes one or more precoding matrices, and one physical resource on the compliant subband corresponds to one precoding matrix in the precoding matrix set;
  • the feedback module 603 is configured to feed back the CQI and the indication information of the selected CSI-RS resource or the CSI-RS port.
  • the measurement module 602 is specifically configured to perform CQI measurement according to downlink channel information and a precoding matrix corresponding to physical resources in the agreed subband, where the precoding matrix is the selected CSI-RS.
  • the selecting module 601 selects a CSI-RS resource on the compliant subband from the channel state information measurement pilot CSI-RS resource set configured by the base station;
  • the measurement module 602 is further configured to:
  • the downlink channel information corresponding to each selected CSI-RS resource is combined, and CQI measurement is performed on the combined downlink channel information according to the precoding matrix set, to obtain a joint CQI corresponding to the selected multiple CSI-RS resources.
  • the selecting module 601 selects a CSI-RS port on the compliant subband from the channel state information measurement pilot CSI-RS resource set configured by the base station;
  • the measurement module 602 is further configured to:
  • the selecting module 601 is specifically configured to: select, according to the predetermined RI and downlink channel information, a CSI-RS resource or a CSI-RS port on the compliant subband from the CSI-RS resource set configured by the base station.
  • the selecting module 601 may determine the selected CSI-RS resource or the number of CSI-RS ports according to the RI.
  • the RI is an RI that is last fed back by the terminal; or the RI is indicated by the base station to the terminal.
  • selecting module 601 is specifically configured to:
  • RS resources Or the transmission performance information corresponding to the CSI-RS port, and selecting the compliant sub-band from the CSI-RS resource set configured by the base station according to the determined transmission performance information corresponding to the CSI-RS resource or the CSI-RS port CSI-RS resource or CSI-RS port.
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of the selected CSI-RS port in all CSI-RS ports included in the CSI-RS resource configured by the base station; or selected The indication information of the CSI-RS port is an index of the precoding matrix set corresponding to the selected CSI-RS port in the predefined codebook.
  • the precoding matrix set corresponding to the selected CSI-RS resource is pre-agreed by the terminal and the base station.
  • the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of a column selection vector or a column selection vector group, wherein one element in the column selection vector is 1 The other elements are all 0; or the precoding matrix set corresponding to the selected CSI-RS port is obtained according to the column selection vector and the phase set, or according to the column selection vector group and the phase set, and the phase set includes one Or a plurality of phase factors, based on a phase factor, to obtain a precoding matrix in a set of precoding matrices.
  • one column vector of the precoding matrix in the precoding matrix set corresponding to the selected CSI-RS port is composed of M column selection vectors, and M is equal to the selected CSI-RS port.
  • the number of ports corresponding to the elements in the M column selection vectors that are 1 constitutes the selected CSI-RS port, and M is an integer greater than or equal to 1.
  • the process of obtaining the precoding matrix set according to a column selection vector and a phase set, or according to a column selection vector group and a phase set includes:
  • a Kronecker product operation is performed on the phase matrix obtained based on one phase factor and the column selection vector or the column selection vector in the column selection vector group, and the column vector in the matrix obtained by the operation constitutes a precoding matrix.
  • the ith physical resource corresponds to the kth precoding matrix in the precoding matrix set, where:
  • the predetermined sub-band, the physical resource, the phase set, and the phase matrix may be the same as the foregoing embodiments, and are not described in detail herein.
  • an embodiment of the present invention further provides a base station.
  • FIG. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention, where the base station can implement the foregoing base station side Precoding process.
  • the base station provided by the embodiment of the present invention includes:
  • the receiving module 701 is configured to receive, by the terminal, a channel quality indicator CQI that is fed back by the terminal, and indication information of a CSI-RS resource or a CSI-RS port on the selected compliant subband;
  • the first determining module 702 is configured to determine, according to the CQI, a modulation and coding mode of the downlink transmission;
  • the second determining module 703 is configured to determine, according to the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant subband, a corresponding precoding matrix set and a beamforming vector;
  • the precoding module 704 is configured to precode data transmitted on the physical resources on the agreed subband according to the determined precoding matrix set and the beamforming vector.
  • the corresponding precoding matrix set and beamforming vector are determined by the second determining module 703 according to the CSI-RS resource or the indication information of the CSI-RS port on the selected compliant subband;
  • the precoding module 704 is specifically configured to:
  • the corresponding precoding matrix set and the beamforming vector are determined by the second determining module 703 according to the indication information of the CSI-RS port on the selected compliant subband; and the precoding module 704 is further Specifically for:
  • one column vector in one precoding matrix is composed of M column selection vectors, each column selection vector corresponds to one CSI-RS port, and the second precoding matrix set includes one or more pre- a coding matrix, where one physical resource on the compliant subband corresponds to one precoding matrix in the second precoding matrix set, and M is an integer greater than or equal to 1;
  • the ith physical resource corresponds to the kth precoding matrix in the second precoding matrix set, where:
  • the indication information of the selected CSI-RS resource is an index of the selected CSI-RS resource in the CSI-RS resource set configured by the base station.
  • the indication information of the selected CSI-RS port is an index of the selected CSI-RS port in all CSI-RS ports included in the CSI-RS resource configured by the base station; or selected The indication information of the CSI-RS port is an index of the precoding matrix set corresponding to the selected CSI-RS port in the predefined codebook.
  • the precoding matrix set corresponding to the selected CSI-RS resource, the precoding matrix set corresponding to the selected CSI-RS port, the compliant subband, the physical resource, the phase set, and the phase matrix may be the same as the foregoing embodiment. It will not be described in detail here.
  • another embodiment of the present invention further provides a terminal, which can implement the broadcast information transmission process on the terminal side.
  • FIG. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the terminal can implement the CSI feedback process on the terminal side.
  • the terminal can include a processor 801, a memory 802, a communication module 803, and a bus interface.
  • the processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations.
  • the communication module 803 is configured to receive and transmit data under the control of the processor 801.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 801 and various circuits of memory represented by memory 802.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the processor 801 is responsible for managing the bus architecture and general processing, and the memory 802 can store data used by the processor 801 in performing operations.
  • the CSI feedback procedure disclosed in the embodiment of the present invention may be applied to the processor 801 or implemented by the processor 801.
  • each step of the process may be completed by an integrated logic circuit of hardware in the processor 801 or an instruction in the form of software.
  • the processor 801 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or perform the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 802, and the processor 801 reads the information in the memory 802 and completes the steps of the CSI feedback flow in conjunction with its hardware.
  • the processor 801 is configured to read programs and data in the memory 802, and perform steps in the CSI feedback flow of the terminal side in the foregoing embodiment.
  • another embodiment of the present invention further provides a base station, which can implement the precoding process on the base station side.
  • FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station can implement the foregoing base station side precoding process.
  • the base station can include a processor 901, a memory 902, a communication interface 903, and a bus interface.
  • the processor 901 is responsible for managing the bus architecture and general processing, and the memory 902 can store data used by the processor 901 in performing operations.
  • the communication interface 903 is for receiving and transmitting data under the control of the processor 901.
  • the bus architecture may include any number of interconnected buses and bridges, specifically linked by one or more processors represented by processor 901 and various circuits of memory represented by memory 902.
  • the bus architecture can also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be further described herein.
  • the bus interface provides an interface.
  • the processor 901 is responsible for managing the bus architecture and general processing, and the memory 902 can store data used by the processor 901 in performing operations.
  • the precoding process disclosed in the embodiment of the present invention may be applied to the processor 901 or implemented by the processor 901.
  • each step of the process may be completed by an integrated logic circuit of hardware in the processor 901 or an instruction in a form of software.
  • the processor 901 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or perform the embodiments of the present invention.
  • a general purpose processor can be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902 and completes the steps of the precoding process in conjunction with its hardware.
  • the processor 901 is configured to read programs and data in the memory 902, and perform steps in the precoding process on the base station side in the foregoing embodiment.
  • 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 include instructions.
  • the instruction means implements the functions specified in a block or blocks of a flow or a flow and/or a 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明公开了一种信道状态信息CSI反馈方法、预编码方法、终端及基站。本发明公开的CSI反馈方法包括:终端根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;终端反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。本发明能够提高CSI与信道状态的匹配程度。

Description

一种CSI反馈方法、预编码方法、终端及基站
本申请要求在2016年3月18日提交中国专利局、申请号为201610158995.3、发明名称为“一种CSI反馈方法、预编码方法及装置”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域,尤其涉及一种CSI反馈方法、预编码方法、终端及基站。
背景技术
移动和宽带成为现代通信技术的发展方向,3GPP(3rd Generation Partnership Project,第三代合作伙伴计划)致力于LTE(Long Term Evolution,长期演进)系统作为3G系统的演进,目标是发展3GPP无线接入技术向着高数据速率、低延迟和优化分组数据应用方向演进。物理层的多天线MIMO(Multiple-Input Multiple-Output,多输入多输出)技术已经成为当前移动通信系统的关键技术之一,多天线技术具有很多优点,比如利用多天线的空分复用增加系统容量,利用多天线的复用增益来扩大系统的吞吐量等。
由于基站获得一定的CSI(Channel State Information,信道状态信息)(可以是瞬时值,也可以是短期或中长期统计信息)后,就可以通过一定的预处理方式对各个数据流加载的功率、速率乃至发射方向进行优化,并有可能通过预处理在终端预先消除数据流之间的部分或全部干扰,以获得更好的性能。
因此,如何提高终端反馈的CSI与信道状态的匹配程度,是业界所亟待研究和解决的问题。
发明内容
本发明实施例提供一种CSI反馈方法、预编码方法、终端及基站,用以提高CSI与信道状态的匹配程度。
第一方面,提供一种CSI反馈方法,包括:
终端根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;所述终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;所述终端反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
其中,所述终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,包括:所述终端根据下行信道信息,以及所述约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中, 所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。
可选的,所述终端根据所选择的CSI-RS资源以及与所选择的CSI-RS资源对应的预编码矩阵集合进行CQI测量,包括:
所述终端根据预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者所述终端将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。
可选的,所述终端根据所选择的CSI-RS端口以及与所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,包括:
所述终端根据预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者所述终端根据所述基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。其中,所述终端基于预先确定的RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
可选的,所述终端根据所述RI确定所选择的CSI-RS资源或者CSI-RS端口数量。
其中,所述RI为所述终端最近一次反馈的RI;或者所述RI为基站指示给所述终端的。
可选的,终端根据下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口,包括:
所述终端根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的下行信道信息,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;或者,所述终端根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;所述终端根据确定出的所述CSI-RS资源或者CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
其中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
其中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
可选的,与所选择的CSI-RS资源对应的预编码矩阵集合为所述终端与基站预先约定的。
可选的,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或者与所选择的CSI-RS端口对应的预编码矩阵集合是根据列选择向量和相位集合,或是根据列选择向量组和相位集合得到,所述相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。
可选的,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
其中,根据列选择向量和相位集合,或是根据列选择向量组和相位集合,得到所述预编码矩阵集合的过程,包括:将基于一个相位因子得到的相位矩阵与所述列选择向量或所述列选择向量组中的列选择向量进行Kronecker积运算,用运算得到的矩阵中的列向量构成一个预编码矩阵。其中,所述约定子带内,第i个物理资源对应于所述预编码矩阵集合中的第k个预编码矩阵,其中:k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,所述约定子带包含一个或多个物理资源块PRB。
其中,所述物理资源为资源单元RE、子载波、物理资源块PRB或PRB集合;或者,所述物理资源为用于传输数据符号的RE、子载波、PRB或PRB集合。
第二方面,提供一种终端,终端包括:选择模块,用于根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;测量模块,用于根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;反馈模块,用于反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
其中,所述测量模块,具体用于:根据下行信道信息,以及所述约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中,所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。
可选的,所述选择模块从基站配置的信道状态信息测量导频CSI-RS资源集合中选择 约定子带上的CSI-RS资源;所述测量模块,具体用于:根据预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。
可选的,所述选择模块从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS端口;所述测量模块,具体用于:根据预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者根据所述基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。
其中,所述选择模块,具体用于:基于预先确定的RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
其中,所述选择模块,具体用于:根据所述RI确定所选择的CSI-RS资源或者CSI-RS端口数量。
其中,所述RI为所述终端最近一次反馈的RI;或者所述RI为基站指示给所述终端的。
进一步地,所述选择模块,具体用于:
根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的下行信道信息,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;或者,根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;
根据确定出的所述CSI-RS资源或者CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
其中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
其中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
可选的,与所选择的CSI-RS资源对应的预编码矩阵集合为所述终端与基站预先约定的。
可选的,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或 者与所选择的CSI-RS端口对应的预编码矩阵集合是根据列选择向量和相位集合,或是根据列选择向量组和相位集合得到,所述相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。
可选的,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
其中,根据列选择向量和相位集合,或是根据列选择向量组和相位集合,得到所述预编码矩阵集合的过程,包括:将基于一个相位因子得到的相位矩阵与所述列选择向量或所述列选择向量组中的列选择向量进行Kronecker积运算,用运算得到的矩阵中的列向量构成一个预编码矩阵。
可选的,所述约定子带内,第i个物理资源对应于所述预编码矩阵集合中的第k个预编码矩阵,其中:k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,所述约定子带包含一个或多个物理资源块PRB。
其中,所述物理资源为资源单元RE、子载波、物理资源块PRB或PRB集合;或者,所述物理资源为用于传输数据符号的RE、子载波、PRB或PRB集合。
本发明的上述实施例中,终端先从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口,再将所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合中的多个预编码矩阵作为子带内不同物理资源上的预编码矩阵进行CQI测量,反馈测量得到的CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。可以看到,基于预编码矩阵集合,针对约定子带内不同物理资源使用对应的预编码矩阵CQI测量,与现有技术中仅基于一个预编码矩阵进行CQI测量相比,可以提高CSI与信道状态的匹配程度。
第三方面,提供一种预编码方法,用以提高预编码后的数据与信道状态的匹配程度。
本发明的一个实施例提供了一种预编码方法,包括:基站接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息;所述基站根据所述CQI确定下行传输的调制编码方式;所述基站根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量;所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码,以提高预编码后的数据与信道状态的匹配程度。
可选的,所述对应的预编码矩阵集合以及波束赋形向量是所述基站根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息确定的。
所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码,包括:所述基站将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;所述基站根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
可选的,所述对应的预编码矩阵集合以及波束赋形向量是所述基站根据所选择的约定子带上的CSI-RS端口的指示信息确定的;所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码,包括:所述基站将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;所述基站根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
可选的,所述约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
其中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
第四方面,提供一种基站,包括:接收模块,用于接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息。第一确定模块,用于根据所述CQI确定下行传输的调制编码方式。第二确定模块,用于根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量。预编码模块,用于根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定 子带上的物理资源上传输的数据进行预编码。
其中,所述对应的预编码矩阵集合以及波束赋形向量是所述第二确定模块根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息确定的。所述预编码模块,具体用于:将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
其中,所述对应的预编码矩阵集合以及波束赋形向量是所述第二确定模块根据所选择的约定子带上的CSI-RS端口的指示信息确定的。所述预编码模块,具体用于:将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
可选的,所述约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
其中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
上述实施例中,基站进行预编码处理时,根据终端反馈的所选择的CSI-RS资源或者CSI-RS端口的指示信息,确定出对应的预编码矩阵集合以及波束赋形向量,再根据确定出的对应的预编码矩阵集合以及波束赋形向量,对约定子带上的物理资源上传输的数据进行预编码。一方面,由于上述实施例中,基站根据预编码矩阵集合中的预编码矩阵,对每个物理资源按照该物理资源对应的预编码矩阵进行预编码,与现有技术中仅基于一个预编码 矩阵进行预编码处理相比,可以使得预编码后的数据更好地与信道状态匹配;另一方面,在基站针对不同的CSI-RS资源或CSI-RS端口发送的CSI-RS采用不同的波束赋形向量进行赋形的情况下,基站可根据终端反馈的CSI-RS资源或者CSI-RS端口的指示信息确定出对应的波束赋形向量,通过在不同的物理资源上使用相应的波束赋形向量以及预编码矩阵进行预编码,与现有技术相比,更进一步提高了预编码后的数据与信道状态的匹配程度,进而保证了下行传输性能。
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简要介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域的普通技术人员来讲,在不付出创造性劳动性的前提下,还可以根据这些附图获得其他的附图。
图1为现有技术中以单用户为例的MIMO系统结构示意图;
图2为现有技术中基于CSI-RS测量机制的一种传输结构示意图;
图3为本发明实施例提供的CSI反馈流程示意图;
图4为本发明实施例提供的CSI-RS端口到天线单元的映射关系的示例;
图5为本发明实施例提供的预编码流程示意图;
图6为本发明一实施例提供的终端的结构示意图;
图7为本发明一实施例提供的基站的结构示意图;
图8为本发明另一实施例提供的终端的结构示意图;
图9为本发明另一实施例提供的基站的结构示意图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚,下面将结合附图对本发明作进一步地详细描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
LTE网络中采用MIMO技术增加系统容量,提升吞吐率。图1示出了以单用户为例的MIMO系统结构框图,发射端(比如基站)和接收端(比如终端)均有多根天线。在发射端,输入的串行码流通过一系列预处理(比如调制、编码、加权、映射)转换成几路并行的独立子码流,通过不同的发射天线发送出去。在接收端,利用不少于发送天线数目的天线组进行接收,并利用估计出的信道传输特性与发送子码流间一定的编码关系对多路接收信号进行空域与时间域上的处理,从而分离出几路发送子码流,再转换成串行数据输出。
但是由于信道矩阵中信道的相关性,容量的增加使得干扰也相应的增大,为了降低终端消除信道间影响实现的复杂度,同时减少系统开销,最大提升MIMO的系统容量,现有 技术中引入预编码技术。
LTE Rel-8系统引入了闭环预编码技术提高频谱效率。闭环预编码要求基站和终端保存同一个预编码矩阵集合,称为码本。终端根据小区公共导频估计出信道信息后,按一定准则从码本中选出一个预编码矩阵,并将该预编码矩阵在码本中的索引通过上行信道反馈到基站,该索引记为PMI(Precoding Matrix Indicator,预编码矩阵指示)。基站根据收到的PMI确定出对该终端使用的预编码矩阵。终端在上报PMI的同时,还要上报相应的RI(Rank Indicator,秩指示)和CQI(Chartered Quality Indicator,信道质量指示),以使基站确定下行传输的码字数量、传输层数量以及各个码字使用的MCS(Modulation and Coding Scheme,调制编码方式)。
随着LTE网络的进一步演进,LTE网络支持更多的天线端口(比如8天线),为了更好地发挥MIMO技术优势,导频结构发生了相应的变化。下行导频分为DMRS(Demodulation Reference Signal,解调参考导频)和CSI-RS(Channel State Indication Reference Signal,信道状态信息测量导频),分别用于解调和信道测量,其中的CSI-RS用于下行链路的信道估计并指导预编码矩阵的选择,终端需要根据对CSI-RS的测量才能生成CQI、PMI或者RI等上报信息。
图2示出了目前基于CSI-RS测量机制的一种无线网结构,其中包括基站201与终端202以及无线链路203。终端202与基站201均有多根天线。终端202根据基站201发送的CSI-RS进行CSI(Channel State Indication,信道状态信息)测量,并将测量得到的CSI通过无线链路203反馈给基站201,CSI中可以包括有指示基站与终端之间的无线通信信道质量的CQI,指示用于将传送信号整形的优选预编码矩阵的PMI、指示终端优选的数据信道的有用传输层的数量的RI,以及信道系数的估计中的一种或多种信息。基站201根据终端202反馈的CSI为下行数据传输选择预编码矩阵和调制编码方式,终端202所反馈的CSI使得基站201能够自适应的配置适合的传输方案来改善覆盖,或用户数据传输速率,或更精确的预测信道质量用于将来对终端202的传输。
由于目前MIMO反馈机制中CSI的反馈时延严重,终端反馈的CSI无法与当前的信道匹配,导致性能下降明显,无法保证传输效率,尤其在高速移动场景下该问题尤为突出。因此,如何提高终端反馈的CSI与实际信道状态的匹配程度,是业界所亟待研究和解决的问题。
为了提高终端反馈的CSI与信道状态的匹配程度,本发明实施例提出一种CSI反馈方案。该方案可应用于下行MIMO传输场景。本发明实施例中,终端在进行CSI测量时,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口,相当于选择了波束赋形向量(或波束赋形向量组),再将所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合中的多个预编码矩阵作为子带内不同物理资源上的预编码矩阵进 行CQI测量,反馈测量得到的CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息,从而提高了CSI与信道状态的匹配程度。
下面结合附图对本发明实施例进行详细描述。
为了更清楚地理解图3所示的流程,下面首先对图3所示的流程中的一些技术术语进行说明:
子带(subband):LTE系统中物理层反馈信道信息的频域粒度单位。系统带宽可以划分为若干个子带,比如根据系统带宽的不同,子带的大小可能是4、6或8等多个PRB。
约定子带:约定带宽大小的子带,本发明实施例中,约定子带可以包含一个或多个PRB(Physical Resource Block,物理资源块),或者约定子带的宽度为系统带宽。带宽大小可以由终端与基站预先约定。
CSI-RS资源:用于表示一套完整的CSI-RS资源配置参数,比如CSI-RS端口数目、周期、起始位置、导频结构类型、子帧内位置标识等。基站在配置的CSI-RS资源上,将CSI-RS信号经过波束进行赋形后发送给终端,其中,不同的CSI-RS资源可以采用不同的波束赋形权值进行赋形。
CSI-RS端口:一个CSI-RS资源可以配置多个CSI-RS端口,比如一个CSI-RS资源中的CSI-RS端口数可以是2,4或8等。基站在配置的CSI-RS资源上,将CSI-RS信号经过波束进行赋形后发送给终端,其中,不同的CSI-RS端口可以采用不同的波束赋形权值进行赋形。
CSI-RS端口组:对一个CSI-RS资源所配置的多个CSI-RS端口按照分组方式进行分组,得到CSI-RS端口组,CSI-RS端口组包括至少一个CSI-RS端口。本实施例中,分组方式可以由基站通知给终端或基站和终端之间预先约定。基站在配置的CSI-RS资源上,将CSI-RS信号经过波束进行赋形后发送给终端,其中,不同的CSI-RS端口组可以采用不同的波束赋形权值进行赋形,同一个CSI-RS端口组内的不同CSI-RS端口可以采用相同的波束赋形权值进行赋形。
例如,按照约定的分组方式,终端将CSI-RS资源中配置的N个CSI-RS端口分为N/2个组,每组两个CSI-RS端口,其中第i个CSI-RS端口组包含的CSI-RS端口索引为{i,i+N/2}。
物理资源:本发明实施例中,不同的物理资源可以是不同的时频资源,也可以是不同的频域资源,或者是不同的时频资源组合。具体地,设定带宽大小内的物理资源,可以是RE(Resource Element,资源单元)、子载波、PRB或PRB集合,也可以是用于传输数据符号的RE、子载波、PRB或PRB集合。
图3示出了本发明实施例提供的CSI反馈方法的流程示意图,该流程可由终端实现。
如图3所示,该流程包括如下步骤:
步骤301:终端根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源 集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
其中,基站首先向终端发送CSI-RS资源配置的相关信息,具体地,基站在配置的CSI-RS资源上,将CSI-RS信号经过波束进行赋形后发送给终端。不同的CSI-RS资源、一个CSI-RS资源中的不同端口、一个CSI-RS资源中的不同端口组、或者不同CSI-RS资源中的不同端口组均可以采用不同的波束赋形权值进行赋形。
例如,基站配置的CSI-RS资源集合中包含4个CSI-RS资源,每个CSI-RS资源采用不同的波束赋形权值进行赋形,进而终端通过步骤301从基站配置的CSI-RS资源集合中选择CSI-RS资源的过程相当于进行波束的选择的过程。
又例如,基站配置的CSI-RS资源集合中包含1个配置了8个CSI-RS端口的CSI-RS资源,该CSI-RS资源中的每个CSI-RS端口采用不同的波束赋形权值进行赋形,进而终端通过步骤301从基站配置的该CSI-RS资源中选择CSI-RS端口的过程也相当于选择波束的过程。
又例如,基站配置的CSI-RS资源集合中包含1个配置了8个CSI-RS端口的CSI-RS资源,该CSI-RS资源中的8个CSI-RS端口分为4个CSI-RS端口组,每个CSI-RS端口组采用不同的波束赋形权值进行赋形,进而终端通过步骤301选择CSI-RS端口组(即选择多个CSI-RS端口)的过程也相当于选择波束的过程。
又例如,基站配置的CSI-RS资源集合中包含4个配置了8个CSI-RS端口的CSI-RS资源,每个CSI-RS资源中的CSI-RS端口分为4个CSI-RS端口组,每个CSI-RS资源采用不同的波束赋形权值进行赋形,同时每个CSI-RS资源中的CSI-RS端口组也采用不同的波束赋形权值进行赋形,即16个CSI-RS端口组分别采用16个不同的波束赋形权值进行赋形,进而终端通过步骤301选择CSI-RS资源以及CSI-RS端口组(即选择多个CSI-RS端口)的过程也相当于选择波束的过程。
其中,一个赋形后的CSI-RS端口可以映射到部分的天线单元上,也可以映射到所有天线单元上。比如,一个包含两个CSI-RS端口的CSI-RS端口组中的一个CSI-RS端口映射到一个极化方向对应的所有天线单元上,另一个CSI-RS端口映射到另一个极化方向对应的所有天线单元上。
举例来说,假设基站共配置了4个天线,且一个CSI-RS资源包含4个CSI-RS端口,这些CSI-RS端口分为2个组,两个CSI-RS组包含的CSI-RS端口分别为{0,2}和{1,3},CSI-RS端口到天线单元的映射关系可以如图4所示。其中,赋形矩阵Wi,j表示第i个CSI-RS端口组的CSI-RS端口在该CSI-RS端口所在极化方向上的第j个天线单元上所用的赋形权值。每个CSI-RS端口赋形后在各自端口的物理资源上传输CSI-RS信号。
终端可以根据基站发送的CSI-RS信号来获取下行信道信息,进而可以根据下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
进一步地,终端可以基于预先确定的RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
其中,终端可以根据预先确定的RI确定所选择的CSI-RS资源或者CSI-RS端口数量。本发明的一些实施例中,上述RI可以是终端最近一次反馈的RI;或者是基站指示给终端的。
具体地,根据前述基站配置的CSI-RS资源集合的不同情况,步骤301中终端选择CSI-RS资源或CSI-RS端口可以包括有以下几种情形:
情形1、基站配置的CSI-RS资源集合中包括多个CSI-RS资源,终端则从基站配置的CSI-RS资源集合中选择约定子带上的一个或多个CSI-RS资源(即从所有CSI-RS资源中选择一个或多个CSI-RS资源)。
情形2、基站配置的CSI-RS资源集合中包括一个配置有多个端口的CSI-RS资源,终端则从基站配置的CSI-RS资源集合中(即该配置有多个端口的CSI-RS资源中)选择约定子带上的一个或多个CSI-RS端口(即从所有CSI-RS端口中选择一个或多个CSI-RS端口)。
情形3、基站配置的CSI-RS资源集合中包括一个配置有多个端口的CSI-RS资源,这些端口按照分组方式进行了分组,终端则从基站配置的CSI-RS资源集合中(即该配置有多个CSI-RS端口的CSI-RS资源中)选择约定子带上的一个或多个CSI-RS端口组(即从所有CSI-RS端口中选择约定子带上的多个CSI-RS端口)。
情形4、基站配置的CSI-RS资源集合中包括多个均配置有多个端口的CSI-RS资源,同时每个CSI-RS资源中的端口按照分组方式进行了分组,终端则从基站配置的CSI-RS资源集合中(即多个配置有多个端口的CSI-RS资源中)选择约定子带上的一个或多个CSI-RS资源以及每个CSI-RS资源中的一个或多个CSI-RS端口组(即从所有CSI-RS端口中选择约定子带上的多个CSI-RS端口)。
应当理解的是,通过上述4个情形的描述,在基站配置的CSI-RS资源集合的不同情况下,终端从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口的具体情形,可以分为两种:终端从基站配置的CSI-RS资源集合中的所有CSI-RS资源中选择约定子带上的CSI-RS资源,或者终端从基站配置的CSI-RS资源集合中的所有CSI-RS端口中选择约定子带上的CSI-RS端口。
下面将以上述的情形1和情形2为例,分别对终端从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源的过程,以及对终端从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS端口的过程,进行描述:
对于情形1(基站配置的CSI-RS资源集合中包括多个CSI-RS资源,终端从中选择一个或多个CSI-RS资源),终端根据下行信道信息,可以通过以下方式选择从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源:
终端根据基站配置的CSI-RS资源集合中的CSI-RS资源所对应的下行信道信息,确定基站配置的CSI-RS资源所对应的传输性能信息,再根据确定出的CSI-RS资源所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源;
或者,终端根据基站配置的CSI-RS资源集合中的CSI-RS资源对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定基站配置的CSI-RS资源所对应的传输性能信息,再根据确定出的CSI-RS资源所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源。
其中,与CSI-RS资源对应的预编码矩阵集合可以是由终端与基站预先约定的。
具体地,终端和基站可以预先配置有相同的包含多个预编码矩阵集合的码本,其中,终端可以根据选择的每个CSI-RS资源包含的CSI-RS端口数,或者所有选择的CSI-RS资源包含的总的CSI-RS端口数,以及当前的传输层数(Rank)假设,确定对应的预编码矩阵集合。例如,预编码矩阵集合中的预编码矩阵的行数等于选择的每个CSI-RS资源包含的CSI-RS端口数,或者所有选择的CSI-RS资源包含的总的CSI-RS端口数;预编码矩阵的列数等于当前的传输层数(Rank)假设。
例如,与CSI-RS资源对应的预编码矩阵集合的一个示例:
Rank=1预编码矩阵集合可以为:
Figure PCTCN2016113160-appb-000001
Rank=2预编码矩阵集合可以为:
Figure PCTCN2016113160-appb-000002
或者
Figure PCTCN2016113160-appb-000003
或者
Figure PCTCN2016113160-appb-000004
Rank=3预编码矩阵集合可以为:
Figure PCTCN2016113160-appb-000005
Figure PCTCN2016113160-appb-000006
或者
Figure PCTCN2016113160-appb-000007
Figure PCTCN2016113160-appb-000008
Rank=4预编码矩阵集合可以为:
Figure PCTCN2016113160-appb-000009
Figure PCTCN2016113160-appb-000010
或者
Figure PCTCN2016113160-appb-000011
Figure PCTCN2016113160-appb-000012
在本发明的一些实施例中,终端可以基于预先确定的RI确定所选择的CSI-RS资源的数量。
例如,按照以下规则中的任一种确定所选择的CSI-RS资源的数量:选择的CSI-RS资源的数量等于RI指示的下行传输层数Rank,选择的每个CSI-RS资源各自进行CSI测量得到的Rank的和等于RI指示的Rank,选择的CSI-RS资源对应的下信道信息进行合并后进行CSI测量时假设的Rank等于RI指示的Rank等。
对于情形2(基站配置的CSI-RS资源集合中包括一个配置有多个CSI-RS端口的CSI-RS资源,终端从所有CSI-RS端口中选择一个或多个CSI-RS端口),终端根据下行信道信息,可以通过以下方式选择从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS端口:
终端根据基站配置的CSI-RS资源集合中的CSI-RS端口所对应的下行信道信息,确定基站配置的CSI-RS端口所对应的传输性能信息,再根据确定出的CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS端口;
或者,终端根据基站配置的CSI-RS资源集合中的CSI-RS端口对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定基站配置的CSI-RS端口所对应的传输性能信息,再根据确定出的CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS端口。
其中,与CSI-RS端口对应的预编码矩阵集合可以是由终端与基站预先约定。
具体地,终端和基站可以预先配置有相同的包含多个预编码矩阵集合的预定义的码本,其中,终端可以根据选择的CSI-RS端口数,以及当前的传输层数(Rank)假设,确定对应的预编码矩阵集合。
具体地,预定义的码本还可以是终端根据预定义的规则生成的:
与CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,可以由列选择向量ei或者列选择向量组{ei}构成,其中,列选择向量ei是第i个元素为1其他元素均为0的向量。
具体的,与M个CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量可以由M个列选择向量{ei}(M=1时为列选择向量,M大于1时为列选择向量组)级联构成,列选择向量ei中取值为1的元素对应一个CSI-RS端口,取值为1的该元素在列选择向量ei中的位置代表CSI-RS端口的标识,M个列选择向量中取值为1的元素对应的CSI-RS端口组成CSI-RS端口,M为大于等于1的整数。
由于一个CSI-RS端口组包含的CSI-RS端口数目等于该CSI-RS端口组对应的预编码矩阵一个列向量中包含的列选择向量的数目。一个预编码矩阵集合中每个列选择向量中取 值为1的元素对应的端口组成了该预编码矩阵集合对应的CSI-RS端口(一个或多个),因此,利用所选择的CSI-RS端口对应的列选择向量或列选择向量组生成的预编码矩阵进行预编码,可以实现CSI-RS端口选择的功能。
例如,假设列选择向量组{ei}的长度为M,i=0,1,2,..,M-1,
Figure PCTCN2016113160-appb-000013
预编码矩阵由列选择向量组{ei}直接构成:
Figure PCTCN2016113160-appb-000014
其中β为常数(功率因子)。
具体地,与CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,还可以由列选择向量ei和相位集合{φn},或者由列选择向量组{ei}和相位集合{φn}得到。
其中,相位集合{φn}中包括一个或多个相位因子φn,基于一个相位因子φn得到一个预编码矩阵集合中的一个预编码矩阵。一个列选择向量ei,或者一个列选择向量组{ei}与相位集合中的不同的相位因子可以得到一个预编码集合中的不同预编码矩阵。
本发明的一些优选实施例中,相位集合可以是由终端与基站预先约定的。一种较佳相位集合可以是{φn=ejnπ/2}或者{φn=ejnπ},其中n为小于N的非负整数,N为集合大小。
例如,
Figure PCTCN2016113160-appb-000015
Figure PCTCN2016113160-appb-000016
其中β为常数(功率因子),αiδiγi为取自相位集合{φn}的相位因子。
进一步地,可以将基于一个相位因子φn得到的相位矩阵与所述列选择向量ei或列选择向量组{ei}中的列选择向量ei进行Kronecker积运算,用运算得到的矩阵中的列向量构成一个预编码矩阵。
其中,相位矩阵可以是
Figure PCTCN2016113160-appb-000017
或者
Figure PCTCN2016113160-appb-000018
或者
Figure PCTCN2016113160-appb-000019
例如,预编码矩阵由相位矩阵
Figure PCTCN2016113160-appb-000020
和列选择向量ei的Kronecker积组成,即预编码矩阵集合中的预编码矩阵为下列矩阵或者下列矩阵中取L列得到,L为当前假设的Rank。
Figure PCTCN2016113160-appb-000021
其中,相位矩阵为
Figure PCTCN2016113160-appb-000022
列选择向量ei,相位因子可以是φn=ejnπ/2或者φn=ejnπ,n=0,1,..,K。
进一步地,本发明的一些实施例中,如果基站还向终端配置了CSI-RS端口的分组方式,比如基站通过高层信令通知给终端,或基站与终端预先约定等,则终端可以根据分组方式将基站配置的CSI-RS资源中的CSI-RS端口进行分组,再根据分组后的结果进行CSI-RS端口的选择,其中,优选的方式是以一个CSI-RS端口组为单元,按照与前述选择CSI-RS端口的方法相应的进行选择,具体可以理解为前述选择CSI-RS端口为多个的情况,比如由列选择向量组构成与CSI-RS端口组对应的预编码矩阵集合,其中,列选择向量组中的每个列选择向量对应CSI-RS端口组中的一个CSI-RS端口。
例如,终端根据分组方式将基站配置的CSI-RS资源中的N个CSI-RS端口分为N/2个组,每组两个CSI-RS端口,其中第i个端口组包含的天线端口索引为{i,i+N/2}。终端可以按照前述选择CSI-RS端口的方法选择CSI-RS端口组。如果基站采用双极化天线阵列,则每个极化天线组对应这里的一个CSI-RS端口组中的一个端口,不同的端口组可以采用不同的波束进行赋形,而一个端口组内的波束赋形相同。
在本发明的一些具体实施例中,终端可以基于基站配置的分组方式或者基站配置的RI指示进行CSI-RS资源或者CSI-RS端口的选择。例如,当RI为1或者2时,采用前述例子里的分组方式,每个CSI-RS端口组包含两个CSI-RS端口;当RI为3或者4时,将CSI-RS端口分为N/4组,每组4个CSI-RS端口,终端选出一个CSI-RS端口组后,可以基于这个CSI-RS端口组进行Rank=3或者4的反馈;当RI大于4时,将CSI-RS端口分为N/8个组,每组8个CSI-RS端口,终端可以基于一个CSI-RS端口组进行Rank>4的传输。
其中,具体过程可与前述选择CSI-RS端口类似,比如终端可以基于预先确定的RI进行CSI-RS端口组的选择,则所采用的预定义码本可以由RI确定。具体的,由RI对应的Rank来决定一个CSI-RS端口组中的端口数目K,K大于RI对应的Rank。如果与CSI-RS端口组(即多个CSI-RS端口)对应的预编码矩阵集合中的一个预编码矩阵的每个列向量都是由N个列选择向量ei级联得到,则这里K=N。例如,K(或N)和RI对应的Rank的对应关系可以由下表得到:
RI对应的Rank K
1 2
2 2
3 4
4 4
5 8
6 8
7 8
8 8
例如,当RI对应的Rank为2时,与CSI-RS端口组(多个CSI-RS端口)对应预编码矩阵集合中的预编码矩阵形式为(预编码矩阵中一个列项量由2个列选择向量构成):
Figure PCTCN2016113160-appb-000023
又例如,当RI对应的Rank为4时,与CSI-RS端口组(多个CSI-RS端口)对应预编码矩阵集合中的预编码矩阵形式为(预编码矩阵中一个列项量由4个列选择向量构成):
Figure PCTCN2016113160-appb-000024
其中,上述例子中,同一行不同列选择向量所采用的相位因子也可以不同。
进一步地,上述以情形1和情形2为例的描述中,终端根据确定出的CSI-RS资源所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源;或者,终端根据确定出的CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS端口,均可以通过但不限于传输性能信息中所包含的以下传输性能参数中的一种或多种:RSRP(Reference Signal Receiving Power,参考信号接收功率)、传输块大小、信道容量、SINR(Signal to Interference plus Noise Ratio,信号与干扰加噪声比)等来进行选择,比如选取RSRP最大的若干个CSI-RS资源或CSI-RS端口,具体数目可以参见前述根据预先确定的RI的方法来确定。
步骤302:终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行CQI测量;其中,预编码矩阵集合中包括一个或多个预编码矩阵,约定子带上的一个物理资源对应预编码矩阵集合中的一个预编码矩阵。
其中,终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资 源或者CSI-RS端口对应的预编码矩阵集合进行CQI测量具体可以是,终端根据下行信道信息,以及约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中,所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。即终端可以将在该步骤302中将所选择的CSI-RS资源或者所选择的CSI-RS端口对应的预编码矩阵集合中的不同预编码矩阵,假设为约定子带内的不同物理资源上传输的数据符号的预编码矩阵,进行CQI测量。
具体地,若终端在步骤301中从基站配置的CSI-RS资源集合中选择出一个或多个CSI-RS资源,则终端可以根据与所选择出的每个CSI-RS资源对应的预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者,终端可以将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。例如,终端可以将N个配置有K个CSI-RS端口的CSI-RS资源对应的下行信道信息合并后,得到一个相当于(N×K)个CSI-RS端口对应的下行信道信息,从而进行CQI测量。
其中,与所选择的CSI-RS资源对应的预编码矩阵集合可以为基站与终端预先约定的。具体可参见前述步骤301中与CSI-RS资源对应的预编码矩阵集合。
若终端在步骤301中从基站配置的CSI-RS资源集合中选择出一个或多个CSI-RS端口,则终端可以根据与所选择出的每个CSI-RS端口对应的预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者终端可以根据基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。。
其中,与所选择的CSI-RS端口对应的预编码矩阵集合可以为基站与终端预先约定的,或者,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵可以由列选择向量或者列选择向量组构成,或是根据列选择向量(或列选择向量组)和相位集合得到的,具体可参见前述步骤301中与CSI-RS端口对应的预编码矩阵集合(预定义的码本)的描述。
如果约定子带内的物理资源数目大于预编码矩阵集合中的预编码矩阵数目,则预编码矩阵集合中的预编码矩阵在带宽内的物理资源上可以循环使用。
具体地,终端可以假设约定子带内,第i个物理资源对应于预编码矩阵集合中的第k个预编码矩阵,其中:
k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,N为子带中的物理资源数量,K为预编码矩阵集合中的预编码矩阵的数量;或者,k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,N为子带中的物理资源数量,K为预编码矩阵集合中的预编码矩阵的数量,通过上述方式以K个物理 资源为单位对预编码矩阵集合中的预编码矩阵进行循环使用。
如果预编码矩阵集合中的预编码矩阵只有一个,则可以假设约定子带内所有物理资源使用的预编码矩阵相同。
进一步地,终端还可以根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合,进行CSI中所包含的如RI或PMI等信息的测量。具体地,终端反馈的CSI中包含的信息可以由基站进行配置,比如基站可以配置终端只上报CQI,或者上报RI和CQI。例如,终端可以基于不同RI对应的信道容量、传输块大小等物理量,选择最佳的RI,并基于最佳RI的假设和所述预定义的预编码矩阵集合,计算各个物理资源上的SINR,从而映射得到相应的CQI。
步骤303:终端反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
其中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在基站配置的CSI-RS资源集合中的索引。
具体地,终端在步骤301中从基站配置的CSI-RS资源集合中选择出CSI-RS资源后,将所选择的CSI-RS资源在CSI-RS资源集合中的索引作为所选择的CSI-RS的指示信息反馈给基站。
例如,基站配置的CSI-RS资源集合中有4个CSI-RS资源,则可以2比特信息,分别指示不同的CSI-RS资源,终端从中选择了一个CSI-RS资源,用2比特信息指示该选择的CSI-RS资源,并进行反馈,如果终端从中选择出1个以上的CSI-RS资源,则终端可以分别反馈所选择的每个CSI-RS资源对应的指示信息。
又例如,终端也可以采用比特图bitmap的方式反馈所选择的CSI-RS资源,即通过bitmap指示所选择的CSI-RS资源,具体可以是在bitmap上对应所选择的CSI-RS资源的比特为1,其他比特为0。
其中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引(方式1);或者,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引(方式2)。
具体地,对于方式1,终端在步骤301中从基站配置的CSI-RS资源集合中选择出CSI-RS端口后,将所选择的CSI-RS端口在基站配置的CSI-RS资源所包含的所有CSI-RS端口中的索引作为所选择的CSI-RS的指示信息反馈给基站。
例如,基站配置的CSI-RS资源集合中有4个CSI-RS端口,则可以2比特信息,分别指示不同的CSI-RS端口,终端从中选择了一个CSI-RS端口,用2比特信息指示该选择的CSI-RS端口,并进行反馈,如果终端从中选择出1个以上的CSI-RS端口,则终端可以分别反馈所选择的每个CSI-RS端口对应的指示信息。
又例如,终端也可以采用比特图bitmap的方式反馈所选择的CSI-RS端口,即通过 bitmap指示所选择的CSI-RS端口,具体可以是在bitmap上对应所选择的CSI-RS端口的比特为1,其他比特为0。
具体地,对于方式2,终端在步骤301中从基站配置的CSI-RS资源集合中选择出CSI-RS端口后,将所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引作为所选择的CSI-RS的指示信息反馈给基站。其中,预定义的码本具体可参见前述步骤301中与CSI-RS端口对应的预编码矩阵集合(预定义的码本)的描述。
为了更清楚的说明上面方式2所描述的所选择的CSI-RS的指示信息,下面给出具体的示例:
示例1、Rank=2,基站配置的CSI-RS资源集合包括8个CSI-RS端口,设所选择的CSI-RS端口的指示信息为i1,i1所指示的预编码矩阵集合中的预编码矩阵在该集合中的索引为i2,i1和预编码矩阵集合的对应关系可以如表1所示:
表1 Rank=2基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000025
示例2、Rank=3,基站配置的CSI-RS资源集合包括8个CSI-RS端口,设所选择的CSI-RS端口的指示信息为i1,i1所指示的预编码矩阵集合中的预编码矩阵在该集合中的索引为i2,i1和预编码矩阵集合的对应关系具体可以如表2、表3、或者表4所示:
表2 Rank=3基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000026
Figure PCTCN2016113160-appb-000027
表3 Rank=3基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000028
表4 Rank=3基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000029
示例3、Rank=4,基站配置的CSI-RS资源集合包括8个CSI-RS端口,设所选择的CSI-RS端口的指示信息为i1,i1所指示的预编码矩阵集合中的预编码矩阵在该集合中的索引为i2,i1和预编码矩阵集合的对应关系具体可以如表5、表6、或者表7所示:
表5 Rank=4基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000030
Figure PCTCN2016113160-appb-000031
表6 Rank=4基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000032
表7 Rank=4基站配置的CSI-RS资源集合包括8个CSI-RS端口
Figure PCTCN2016113160-appb-000033
Figure PCTCN2016113160-appb-000034
具体地,在步骤303中,终端可以分别反馈CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息,或者终端也可以一起反馈CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
例如,终端根据基站的触发进行非周期反馈,在一个子帧中上报CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
又例如,终端可以将CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息进行比特级联或者联合编码,一起反馈给基站。
综上所述,本发明实施例提出一种CSI反馈方案。本发明实施例中,终端先从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口,再将所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合中的多个预编码矩阵作为子带内不同物理资源上的预编码矩阵进行CQI测量,反馈测量得到的CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。本发明实施例中,终端基于预编码矩阵集合,针对约定子带内不同物理资源使用对应的预编码矩阵CQI测量,与现有技术中仅基于一个预编码矩阵进行CQI测量相比,可以提高CSI与信道状态的匹配程度。
基于相同的技术构思,本发明实施例还提供了一种预编码方法。
图5示出了本发明的又一个实施例提供的预编码方法的流程示意图,该流程可由基站实现,该流程包括如下步骤:
步骤501:基站接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息。
步骤502:基站根据所述CQI确定下行传输的调制编码方式。
步骤503:基站根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量。
步骤504:基站根据确定出的预编码矩阵集合以及波束赋形向量,对约定子带上的物理资源上传输的数据进行预编码。
其中,基站可以根据接收到的终端反馈的CQI确定下行传输的调制编码方式。
其中,基站根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息,确定 对应的预编码矩阵集合以及波束赋形向量后,可以将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,第二预编码矩阵集合中包括一个或多个预编码矩阵,约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;基站再根据约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对约定子带上的物理资源上传输的数据进行预编码。
具体地,若基站在步骤501中接收到的终端反馈的所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息为所选择的CSI-RS资源在基站配置的CSI-RS资源集合中的索引或者CSI-RS端口在基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引,则在步骤503中,基站根据该指示信息对应的CSI-RS资源或者CSI-RS端口,从而确定对应的预编码矩阵集合,并将该CSI-RS资源或者CSI-RS端口进行赋形所采用的赋形向量作为约定带宽内下行传输所采用的波束赋形向量,进而在步骤504中,基站根据在步骤503中确定的波束赋形向量和预编码矩阵集合中的不同预编码矩阵,得到用于下行传输的预编码矩阵集合,使用该预编码矩阵集合对约定子带上的物理资源上传输的数据进行预编码。
具体地,在步骤504中,基站将波束赋形向量和预编码矩阵集合(为了方便表述,在本发明实施例中可以用第一预编码矩阵集合表示)中的不同预编码矩阵进行运算,将运算得到的预编码矩阵集合(可以用第二预编码矩阵集合表示)中的预编码矩阵,分别作为约定子带内不同物理资源上传输数据符号所使用的预编码矩阵,即约定子带上的一个物理资源对应第二预编码矩阵集合中的一个预编码矩阵,基站根据第二预编码矩阵集合,对约定子带上的物理资源上传输的数据进行预编码。该过程可以与终端侧测量CQI时假设不同物理资源上的数据符号使用的预编码矩阵的过程相同。
本发明一些优选实施例中,上述运算可以是Kronecker积运算。
其中,在运算用于下行传输的第二预编码矩阵集合中使用的第一预编码矩阵集合具体可以与前述终端侧方法实施例中所描述的终端在测量CQI时使用的预编码矩阵集合相同。
例如,假设终端反馈的指示信息指示选择了k个CSI-RS资源或者CSI-RS端口,所选择的k个CSI-RS资源或者CSI-RS端口进行赋形所采用的赋形向量分别为{υ12,...,υk},υk对应的预编码矩阵集合为{wk,i,i=1,2,...,K},则最终用于数据传输的预编码矩阵为
Figure PCTCN2016113160-appb-000035
基站将Wi作为约定子带内第n×K+i个物理资源上的预编码矩阵。
其中,基站根据所选择的约定子带上的CSI-RS端口的指示信息确定对应的预编码矩阵集合以及波束赋形向量后,可以将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的 第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,第二预编码矩阵集合中包括一个或多个预编码矩阵,约定子带上的一个物理资源对应第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;基站再根据约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对约定子带上的物理资源上传输的数据进行预编码。
具体地,若基站在步骤501中接收到的终端反馈的所选择的约定子带上的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引,则基站在步骤503中,根据该指示信息从预定义的码本中确定出该指示信息对应的预编码矩阵集合,则基站可以根据该确定的预编码矩阵集合的各个预编码矩阵中的列选择向量,得到选择出的CSI-RS端口以及对应的波束赋形向量,其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,M为大于等于1的整数;进而在步骤504中,基站可以将在步骤503中所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合,将第二预编码矩阵集合中的不同预编码矩阵,分别作为约定子带内不同物理资源上传输数据符号所用的预编码矩阵。该过程可以与终端侧测量CQI时假设不同物理资源上的数据符号使用的预编码矩阵的过程相同。
其中,在运算用于下行传输的第二预编码矩阵集合中使用的与所选择的CSI-RS端口对应的预编码矩阵集合具体可以与前述终端侧方法实施例中所描述的终端在测量CQI时使用的与所选择的CSI-RS端口对应的预编码矩阵集合相同。预定义的码本具体也可参见前述终端侧方法实施例中所描述的预定义的码本。比如,根据CSI-RS端口指示信息确定出的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或者是根据列选择向量和相位集合(或是根据列选择向量组和相位集合)得到,相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。以及比如,根据CSI-RS端口指示信息确定出的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
例如,假设与所选择的CSI-RS端口对应的预编码矩阵集合的一个预编码矩阵中使用的列选择向量为ek,表示选择第k个CSI-RS资源或者CSI-RS端口(或CSI-RS端口组),且第k个CSI-RS资源或者CSI-RS端口(或CSI-RS组)使用的赋形向量为υk,则基站用υk代替预先预编码矩阵中的ek得到第二预编码矩阵集合中的预编码矩阵。比如,假设与所选择的CSI-RS端口对应的预编码矩阵集合的一个预编码矩阵为:
Figure PCTCN2016113160-appb-000036
则基站用于下行传输预编码的第二预编码矩阵集合中的预编码矩阵为:
Figure PCTCN2016113160-appb-000037
其中
Figure PCTCN2016113160-appb-000038
为第k1个CSI-RS资源或者端口组使用的赋形向量
本发明的一些实施例中,在约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:
k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,约定子带、物理资源,相位集合可同前述实施例,在此不再详述。
可以看到本发明实施例中,基站进行预编码处理时,根据终端反馈的所选择的CSI-RS资源或者CSI-RS端口的指示信息,确定出对应的预编码矩阵集合以及波束赋形向量,再根据确定出的对应的预编码矩阵集合以及波束赋形向量,对约定子带上的物理资源上传输的数据进行预编码。一方面,由于本发明实施例中,基站根据预编码矩阵集合中的预编码矩阵,对每个物理资源按照该物理资源对应的预编码矩阵进行预编码,与现有技术中仅基于一个预编码矩阵进行预编码处理相比,可以使得预编码后的数据更好地与信道状态匹配;另一方面,在基站针对不同的CSI-RS资源或CSI-RS端口发送的CSI-RS采用不同的波束赋形向量进行赋形的情况下,基站可根据终端反馈的CSI-RS资源或者CSI-RS端口的指示信息确定出对应的波束赋形向量,通过在不同的物理资源上使用相应的波束赋形向量以及预编码矩阵进行预编码,与现有技术相比,更进一步提高了预编码后的数据与信道状态的匹配程度,进而保证了下行传输性能,特别是在高速场景下能够保证较为稳定的预编码增益,相对传统MIMO传输方案能够明显提高性能,还能够使得每个数据流遍历预编码矩阵中的不同列向量,因此各个数据流的SINR差别很小,进一步避免了一个码字对应的不同数据流SINR不均衡的问题。
基于相同的技术构思,本发明实施例还提供了一种终端。
参见图6,为本发明实施例提供的终端的结构示意图,该终端可以实现前述终端侧的CSI反馈流程。如图6所示,本发明实施例提供的终端,包括:
选择模块601,用于根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;
测量模块602,用于根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;
反馈模块603,用于反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
其中,所述测量模块602,具体用于:根据下行信道信息,以及所述约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中,所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。
具体地,所述选择模块601从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源;
进而所述测量模块602,具体用于:
根据预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者
将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。
具体地,所述选择模块601从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS端口;
进而所述测量模块602,具体用于:
根据预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者
根据所述基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。
进一步地,所述选择模块601,具体用于:基于预先确定的RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
具体地,所述选择模块601可以根据所述RI确定所选择的CSI-RS资源或者CSI-RS端口数量。
其中,所述RI为所述终端最近一次反馈的RI;或者所述RI为基站指示给所述终端的。
进一步地,所述选择模块601,具体用于:
根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的下行信道信息,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;或者,根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定所述基站配置的CSI-RS资源 或者CSI-RS端口所对应的传输性能信息;根据确定出的所述CSI-RS资源或者CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
本发明的一些实施例中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
本发明的一些实施例中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
本发明的一些实施例中,与所选择的CSI-RS资源对应的预编码矩阵集合为所述终端与基站预先约定的。
本发明的一些实施例中,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或者与所选择的CSI-RS端口对应的预编码矩阵集合是根据列选择向量和相位集合,或是根据列选择向量组和相位集合得到,所述相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。
本发明的一些实施例中,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
具体地,本发明的一些实施例中,根据列选择向量和相位集合,或是根据列选择向量组和相位集合,得到所述预编码矩阵集合的过程,包括:
将基于一个相位因子得到的相位矩阵与所述列选择向量或所述列选择向量组中的列选择向量进行Kronecker积运算,用运算得到的矩阵中的列向量构成一个预编码矩阵。
本发明的一些实施例中,所述约定子带内,第i个物理资源对应于所述预编码矩阵集合中的第k个预编码矩阵,其中:
k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
其中,约定子带、物理资源、相位集合、相位矩阵可同前述实施例,在此不再详述。
基于相同的技术构思,本发明实施例还提供了一种基站。
参见图7,为本发明实施例提供的基站的结构示意图,该基站可以实现前述基站侧的 预编码流程。如图7所示,本发明实施例提供的基站,包括:
接收模块701,用于接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息;
第一确定模块702,用于根据所述CQI确定下行传输的调制编码方式;
第二确定模块703,用于根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量;
预编码模块704,用于根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码。
具体地,所述对应的预编码矩阵集合以及波束赋形向量是所述第二确定模块703根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息确定的;进而所述预编码模块704,具体用于:
将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;
根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
具体地,所述对应的预编码矩阵集合以及波束赋形向量是所述第二确定模块703根据所选择的约定子带上的CSI-RS端口的指示信息确定的;进而所述预编码模块704,具体用于:
将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;
根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
具体地,所述约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:
k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为 子带中的物理资源数量。
本发明的一些实施例中,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
本发明的一些实施例中,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
其中,与所选择的CSI-RS资源对应的预编码矩阵集合、与所选择的CSI-RS端口对应的预编码矩阵集合、约定子带、物理资源、相位集合、相位矩阵可同前述实施例,在此不再详述。
基于相同的技术构思,本发明的另一实施例还提供了一种终端,该终端可实现前述终端侧的广播信息传输流程。
参见图8,为本发明实施例提供的终端的结构示意图。该终端可实现上述终端侧的CSI反馈流程。如图所示,该终端可包括:处理器801、存储器802、通信模块803以及总线接口。
处理器801负责管理总线架构和通常的处理,存储器802可以存储处理器801在执行操作时所使用的数据。通信模块803用于在处理器801的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥,具体由处理器801代表的一个或多个处理器和存储器802代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。处理器801负责管理总线架构和通常的处理,存储器802可以存储处理器801在执行操作时所使用的数据。
本发明实施例揭示的CSI反馈流程,可以应用于处理器801中,或者由处理器801实现。在实现过程中,流程的各步骤可以通过处理器801中的硬件的集成逻辑电路或者软件形式的指令完成。处理器801可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件,可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器,闪存、只读存储器,可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器802,处理器801读取存储器802中的信息,结合其硬件完成CSI反馈流程的步骤。
具体地,处理器801,用于读取存储器802中的程序和数据,执行前述实施例中终端侧的CSI反馈流程中的各步骤。
基于相同的技术构思,本发明的另一实施例还提供了一种基站,该基站可实现前述基站侧的预编码流程。
参见图9,为本发明实施例提供的基站的结构示意图。该基站可实现上述基站侧预编码流程。如图所示,该基站可包括:处理器901、存储器902、通信接口903以及总线接口。
处理器901负责管理总线架构和通常的处理,存储器902可以存储处理器901在执行操作时所使用的数据。通信接口903用于在处理器901的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥,具体由处理器901代表的一个或多个处理器和存储器902代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起,这些都是本领域所公知的,因此,本文不再对其进行进一步描述。总线接口提供接口。处理器901负责管理总线架构和通常的处理,存储器902可以存储处理器901在执行操作时所使用的数据。
本发明实施例揭示的预编码流程,可以应用于处理器901中,或者由处理器901实现。在实现过程中,流程的各步骤可以通过处理器901中的硬件的集成逻辑电路或者软件形式的指令完成。处理器901可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件,可以实现或者执行本发明实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本发明实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成,或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器,闪存、只读存储器,可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器902,处理器901读取存储器902中的信息,结合其硬件完成预编码流程的步骤。
具体地,处理器901,用于读取存储器902中的程序和数据,执行前述实施例中基站侧的预编码流程中的各步骤。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器,使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中,使得存储在该计算机可读存储器中的指令产生包括指令装 置的制造品,该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上,使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理,从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本发明的优选实施例,但本领域内的技术人员一旦得知了基本创造性概念,则可对这些实施例作出另外的变更和修改。所以,所附权利要求意欲解释为包括优选实施例以及落入本发明范围的所有变更和修改。
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。

Claims (40)

  1. 一种信道状态信息CSI反馈方法,其特征在于,包括:
    终端根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;
    所述终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;
    所述终端反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
  2. 如权利要求1所述的方法,其特征在于,所述终端根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,包括:
    所述终端根据下行信道信息,以及所述约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中,所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。
  3. 如权利要求1所述的方法,其特征在于,所述终端根据所选择的CSI-RS资源以及与所选择的CSI-RS资源对应的预编码矩阵集合进行CQI测量,包括:
    所述终端根据预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者
    所述终端将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。
  4. 如权利要求1所述的方法,其特征在于,所述终端根据所选择的CSI-RS端口以及与所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,包括:
    所述终端根据预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者
    所述终端根据所述基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。
  5. 如权利要求1所述的方法,其特征在于,所述终端基于预先确定的秩指示RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
  6. 如权利要求1所述的方法,其特征在于,终端根据下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口,包括:
    所述终端根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的下行信道信息,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;或者,所述终端根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;
    所述终端根据确定出的所述CSI-RS资源或者CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
  7. 如权利要求1所述的方法,其特征在于,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
  8. 如权利要求1所述的方法,其特征在于,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
    所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
  9. 如权利要求1-8中任一项所述的方法,其特征在于,与所选择的CSI-RS资源对应的预编码矩阵集合为所述终端与基站预先约定的。
  10. 如权利要求1-8中任一项所述的方法,其特征在于,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或者
    与所选择的CSI-RS端口对应的预编码矩阵集合是根据列选择向量和相位集合,或是根据列选择向量组和相位集合得到,所述相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。
  11. 如权利要求10所述的方法,其特征在于,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
  12. 如权利要求1-11中任一项所述的方法,其特征在于,所述约定子带内,第i个物理资源对应于所述预编码矩阵集合中的第k个预编码矩阵,其中:
    k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
    k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
  13. 如权利要求1-11中任一项所述的方法,其特征在于,所述物理资源为资源单元 RE、子载波、物理资源块PRB或PRB集合;或者,所述物理资源为用于传输数据符号的RE、子载波、PRB或PRB集合。
  14. 一种预编码方法,其特征在于,包括:
    基站接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息;
    所述基站根据所述CQI确定下行传输的调制编码方式;
    所述基站根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量;
    所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码。
  15. 如权利要求14所述的方法,其特征在于,所述对应的预编码矩阵集合以及波束赋形向量是所述基站根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息确定的;
    所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码,包括:
    所述基站将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;
    所述基站根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
  16. 如权利要求14所述的方法,其特征在于,所述对应的预编码矩阵集合以及波束赋形向量是所述基站根据所选择的约定子带上的CSI-RS端口的指示信息确定的;
    所述基站根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码,包括:
    所述基站将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;
    所述基站根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
  17. 如权利要求15或16所述的方法,其特征在于,所述约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:
    k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
    k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
  18. 如权利要求14所述的方法,其特征在于,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
  19. 如权利要求14所述的方法,其特征在于,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
    所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
  20. 一种终端,其特征在于,包括:
    选择模块,用于根据下行信道信息,从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口;
    测量模块,用于根据所选择的CSI-RS资源或者CSI-RS端口,以及与所选择的CSI-RS资源或者CSI-RS端口对应的预编码矩阵集合进行信道质量指示CQI测量;其中,所述预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述预编码矩阵集合中的一个预编码矩阵;
    反馈模块,用于反馈所述CQI以及所选择的CSI-RS资源或者CSI-RS端口的指示信息。
  21. 如权利要求20所述的终端,其特征在于,所述测量模块,具体用于:
    根据下行信道信息,以及所述约定子带内的物理资源对应的预编码矩阵进行CQI测量,其中,所述预编码矩阵为所选择的CSI-RS资源或者所选择的CSI-RI端口对应的预编码矩阵集合中的预编码矩阵。
  22. 如权利要求20所述的终端,其特征在于,所述选择模块从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS资源;
    所述测量模块,具体用于:
    根据预编码矩阵集合,分别针对所选择的每个CSI-RS资源对应的下行信道信息进行CQI测量,得到每个CSI-RS资源对应的CQI;或者
    将所选择的每个CSI-RS资源对应的下行信道信息进行合并,并根据预编码矩阵集合对合并后的下行信道信息进行CQI测量,得到所选择的多个CSI-RS资源对应的联合CQI。
  23. 如权利要求20所述的终端,其特征在于,所述选择模块从基站配置的信道状态信息测量导频CSI-RS资源集合中选择约定子带上的CSI-RS端口;
    所述测量模块,具体用于:
    根据预编码矩阵集合,针对所选择的CSI-RS端口对应的下行信道信息进行CQI测量,得到所选择的CSI-RS端口对应的CQI;或者
    根据所述基站配置的CSI-RS资源对应的下行信道信息,以及所选择的CSI-RS端口对应的预编码矩阵集合进行CQI测量,得到所选择的CSI-RS端口对应的CQI。
  24. 如权利要求20所述的终端,其特征在于,所述选择模块,具体用于:
    基于预先确定的秩指示RI和下行信道信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
  25. 如权利要求20所述的终端,其特征在于,所述选择模块,具体用于:
    根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的下行信道信息,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;或者,根据所述基站配置的CSI-RS资源集合中的CSI-RS资源或者CSI-RS端口所对应的预编码矩阵集合与下行信道信息进行计算得到的结果,确定所述基站配置的CSI-RS资源或者CSI-RS端口所对应的传输性能信息;
    根据确定出的所述CSI-RS资源或者CSI-RS端口所对应的传输性能信息,从基站配置的CSI-RS资源集合中选择约定子带上的CSI-RS资源或者CSI-RS端口。
  26. 如权利要求20所述的终端,其特征在于,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
  27. 如权利要求20所述的终端,其特征在于,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
    所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
  28. 如权利要求20-27中任一项所述的终端,其特征在于,与所选择的CSI-RS资源对应的预编码矩阵集合为所述终端与基站预先约定的。
  29. 如权利要求20-27中任一项所述的终端,其特征在于,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵,由列选择向量或者列选择向量组构成,其中,列选择向量中的一个元素为1,其他元素均为0;或者
    与所选择的CSI-RS端口对应的预编码矩阵集合是根据列选择向量和相位集合,或是根据列选择向量组和相位集合得到,所述相位集合中包括一个或多个相位因子,基于一个相位因子得到一个预编码矩阵集合中的一个预编码矩阵。
  30. 如权利要求29所述的终端,其特征在于,与所选择的CSI-RS端口对应的预编码矩阵集合中的预编码矩阵的一个列向量由M个列选择向量级联构成,M等于所选择的CSI-RS端口的数量,所述M个列选择向量中取值为1的元素对应的端口组成所选择的CSI-RS端口,M为大于等于1的整数。
  31. 如权利要求20-30中任一项所述的终端,其特征在于,所述约定子带内,第i个物理资源对应于所述预编码矩阵集合中的第k个预编码矩阵,其中:
    k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
    k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
  32. 如权利要求20-30中任一项所述的终端,其特征在于,所述物理资源为资源单元RE、子载波、物理资源块PRB或PRB集合;或者,所述物理资源为用于传输数据符号的RE、子载波、PRB或PRB集合。
  33. 一种基站,其特征在于,包括:
    接收模块,用于接收终端反馈的信道质量指示CQI以及所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息;
    第一确定模块,用于根据所述CQI确定下行传输的调制编码方式;
    第二确定模块,用于根据所选择的约定子带上的CSI-RS资源或者CSI-RS端口的指示信息,确定对应的预编码矩阵集合以及波束赋形向量;
    预编码模块,用于根据确定出的预编码矩阵集合以及波束赋形向量,对所述约定子带上的物理资源上传输的数据进行预编码。
  34. 如权利要求33所述的基站,其特征在于,所述对应的预编码矩阵集合以及波束赋形向量是所述第二确定模块根据所选择的约定子带上的CSI-RS资源或CSI-RS端口的指示信息确定的;
    所述预编码模块,具体用于:
    将所确定出的第一预编码矩阵集合中的预编码矩阵与所确定出的波束赋形向量进行运算,得到用于进行预编码的第二预编码矩阵集合;其中,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵;
    根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
  35. 如权利要求33所述的基站,其特征在于,所述对应的预编码矩阵集合以及波束 赋形向量是所述第二确定模块根据所选择的约定子带上的CSI-RS端口的指示信息确定的;
    所述预编码模块,具体用于:
    将所确定出的预编码矩阵集合中的预编码矩阵中的每个列选择向量分别替换为每个列选择向量各自对应的波束赋形向量,得到用于进行预编码的第二预编码矩阵集合;其中,一个预编码矩阵中的一个列向量是由M个列选择向量级联构成,每个列选择向量对应一个CSI-RS端口,所述第二预编码矩阵集合中包括一个或多个预编码矩阵,所述约定子带上的一个物理资源对应所述第二预编码矩阵集合中的一个预编码矩阵,M为大于等于1的整数;
    根据所述约定子带上的物理资源对应的所述第二预编码矩阵集合中的预编码矩阵,对所述约定子带上的物理资源上传输的数据进行预编码。
  36. 如权利要求34或35所述的基站,其特征在于,所述约定子带内,第i个物理资源对应于所述第二预编码矩阵集合中的第k个预编码矩阵,其中:
    k=i mod K,其中,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量;或者,
    k=ceil(i/v)mod K,其中,ceil(i/v)表示不小于i/v的最小整数,v=RI或v为天线端口数目,i=0,1,2…N,k=0,1,2,3,…,K-1,K为第二预编码矩阵集合中的预编码矩阵的数量,N为子带中的物理资源数量。
  37. 如权利要求33所述的基站,其特征在于,所选择的CSI-RS资源的指示信息为所选择的CSI-RS资源在所述基站配置的CSI-RS资源集合中的索引。
  38. 如权利要求33所述的基站,其特征在于,所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口在所述基站配置的CSI-RS资源包含的所有CSI-RS端口中的索引;或者
    所选择的CSI-RS端口的指示信息为所选择的CSI-RS端口对应的预编码矩阵集合在预定义的码本中的索引。
  39. 一种终端,其特征在于,包括处理器、存储器、通信模块以及总线接口,其中,
    所述存储器用于存储处理器在执行操作时所使用的数据,所述处理器用于执行所述存储器存储的指令,以管理总线架构并控制通信模块进行接收和发送数据,当处理器执行所述存储器存储的指令时,所述终端用于完成如权利要求1至13任意一项所述的方法。
  40. 一种基站,其特征在于,包括处理器、存储器、通信模块以及总线接口,其中,
    所述存储器用于存储处理器在执行操作时所使用的数据,所述处理器用于执行所述存储器存储的指令,以管理总线架构并控制通信模块进行接收和发送数据,当处理器执行所述存储器存储的指令时,所述终端用于完成如权利要求14至19任意一项所述的方法。
PCT/CN2016/113160 2016-03-18 2016-12-29 一种csi反馈方法、预编码方法、终端及基站 Ceased WO2017157082A1 (zh)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2018549253A JP6692447B2 (ja) 2016-03-18 2016-12-29 Csiのフィードバック方法、プリコーディング方法、装置、端末及び基地局
US16/086,009 US10790890B2 (en) 2016-03-18 2016-12-29 CSI feedback method, precoding method, terminal and base station
EP16894241.5A EP3432482B1 (en) 2016-03-18 2016-12-29 Csi feedback method, precoding method, terminal and base station
KR1020187030196A KR102146438B1 (ko) 2016-03-18 2016-12-29 Csi피드백 방법, 프리코딩 방법, 장치, 단말 및 기지국
EP23154544.3A EP4195521A1 (en) 2016-03-18 2016-12-29 Csi feedback method, precoding method, terminal and base station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610158995.3 2016-03-18
CN201610158995.3A CN107204794B (zh) 2016-03-18 2016-03-18 一种csi反馈方法及装置

Publications (1)

Publication Number Publication Date
WO2017157082A1 true WO2017157082A1 (zh) 2017-09-21

Family

ID=59850114

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/113160 Ceased WO2017157082A1 (zh) 2016-03-18 2016-12-29 一种csi反馈方法、预编码方法、终端及基站

Country Status (6)

Country Link
US (1) US10790890B2 (zh)
EP (2) EP4195521A1 (zh)
JP (1) JP6692447B2 (zh)
KR (1) KR102146438B1 (zh)
CN (1) CN107204794B (zh)
WO (1) WO2017157082A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112292879A (zh) * 2018-06-19 2021-01-29 日本电气株式会社 用于多trp/面板传输的csi测量

Families Citing this family (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107888264B (zh) * 2016-09-30 2022-12-30 中兴通讯股份有限公司 信道信息的反馈方法及装置
WO2018144876A1 (en) * 2017-02-03 2018-08-09 Ntt Docomo, Inc. User equipment and wireless communication method
WO2019061260A1 (zh) * 2017-09-29 2019-04-04 华为技术有限公司 一种测量方法、网络设备和终端设备
WO2020047774A1 (zh) * 2018-09-05 2020-03-12 华为技术有限公司 信道信息处理方法和装置
CN110958097B (zh) 2018-09-27 2021-06-11 电信科学技术研究院有限公司 Csi的上报方法、装置、终端及网络侧设备
WO2020118501A1 (en) 2018-12-11 2020-06-18 Qualcomm Incorporated Basis report for compressed csi feedback with non-contiguous subband configuration
CN111355566B (zh) * 2018-12-24 2023-03-28 成都华为技术有限公司 信道状态信息获取方法及相关设备
US11974360B2 (en) * 2019-02-15 2024-04-30 Sony Group Corporation Methods for polarization reporting; related wireless devices and related network nodes
CN113596880B (zh) * 2019-03-21 2023-08-08 Oppo广东移动通信有限公司 无线通信的方法、终端设备和网络设备
BR112021026640A2 (pt) 2019-07-15 2022-03-22 Qualcomm Inc Sinal de referência de informação de estado de canal para operação de banda larga
US11336352B2 (en) * 2019-07-15 2022-05-17 Qualcomm Incorporated Channel state information reference signal for wideband operation
CN114208050B (zh) * 2019-08-01 2023-04-11 华为技术有限公司 用于多天线网络实体和无线通信装置的自适应克罗内克积mimo预编码及相应方法
US11888772B2 (en) * 2019-08-28 2024-01-30 Qualcomm Incorporated Channel state information reference signal processing for new radio in the unlicensed spectrum
CN113131978B (zh) * 2019-12-30 2022-04-19 大唐移动通信设备有限公司 一种基于信道互易性的预编码矩阵配置方法及装置
CN113810090B (zh) 2020-06-16 2023-07-28 华为技术有限公司 通信方法和通信装置
US12425160B2 (en) * 2020-07-28 2025-09-23 Lg Electronics Inc. Method and apparatus for transmitting or receiving channel state information in wireless communication system
CN116114186A (zh) * 2020-08-07 2023-05-12 苹果公司 网络中具有部分互易性的分级信道状态信息(csi)反馈
WO2022027637A1 (en) 2020-08-07 2022-02-10 Apple Inc. Hierarchical channel state information (csi) feedback with partial reciprocity with user equipment (ue)
CN114389661B (zh) * 2020-10-22 2022-11-22 华为技术有限公司 信道测量的方法及通信装置
CN114499780B (zh) * 2020-10-23 2024-05-10 大唐移动通信设备有限公司 一种csi-rs增强传输方法及装置
CN114765509B (zh) * 2021-01-15 2024-01-05 大唐移动通信设备有限公司 信息上报、接收方法、终端设备及网络设备
CN115190498B (zh) * 2021-04-02 2024-04-26 大唐移动通信设备有限公司 增强的csi-rs传输、发送反馈信息的方法、装置、设备及介质
CN115189837B (zh) * 2021-04-02 2024-04-12 大唐移动通信设备有限公司 端口指示信息上报方法及终端
WO2022238942A1 (en) * 2021-05-11 2022-11-17 Telefonaktiebolaget Lm Ericsson (Publ) Configuring channel state information (csi) feedback
CN117616700A (zh) * 2021-08-27 2024-02-27 联想(北京)有限公司 用于功率控制及干扰协调的方法及设备
CN115733532A (zh) * 2021-08-31 2023-03-03 华为技术有限公司 一种通信方法及装置
WO2023039843A1 (en) * 2021-09-17 2023-03-23 Lenovo (Beijing) Limited Method and apparatus for beam management
CN113852986B (zh) * 2021-09-28 2023-08-18 星思连接(上海)半导体有限公司 信息上报方法、装置、电子设备及可读存储介质
CN116709366A (zh) * 2022-02-28 2023-09-05 华为技术有限公司 一种通信方法及通信装置
JP2026507171A (ja) * 2023-04-14 2026-02-27 新華三技術有限公司 Csi-rs伝送方法、装置及び機器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170334A (zh) * 2011-05-03 2011-08-31 中兴通讯股份有限公司 信道质量指示信息的获取方法和装置
CN103326761A (zh) * 2012-03-19 2013-09-25 中兴通讯股份有限公司 信道状态信息处理方法及装置
CN103391127A (zh) * 2012-05-11 2013-11-13 上海贝尔股份有限公司 多点协作的信息反馈方法与装置
US20130343299A1 (en) * 2012-06-21 2013-12-26 Samsung Electronics Co., Ltd Method for cqi feedback without spatial feedback (pmi/ri) for tdd coordinated multi-point and carrier aggregation scenarios

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2555444B1 (en) 2010-03-29 2017-03-08 LG Electronics Inc. Method and apparatus for efficient feedback in a wireless communication system supporting multiple antennas
US9036586B2 (en) * 2010-08-20 2015-05-19 Lg Electronics Inc. Method of transmitting information about a pre-coding matrix of a terminal in a multiple node system
CN102546110A (zh) * 2011-12-31 2012-07-04 电信科学技术研究院 一种传输信道状态信息的方法及装置
US9119209B2 (en) * 2012-03-30 2015-08-25 Samsung Electronics Co., Ltd. Apparatus and method for channel-state-information pilot design for an advanced wireless network
US9681425B2 (en) * 2012-05-11 2017-06-13 Qualcomm Incorporated Rank-specific feedback for improved MIMO support
EP3883172A1 (en) * 2012-06-04 2021-09-22 Interdigital Patent Holdings, Inc. Communicating channel state information (csi) of multiple transmission points
JP6324954B2 (ja) * 2012-06-18 2018-05-16 サムスン エレクトロニクス カンパニー リミテッド 協調マルチポイント送信のための非周期的及び周期的csiフィードバックモード
US9225478B2 (en) * 2012-07-02 2015-12-29 Intel Corporation Supporting measurments and feedback for 3D MIMO with data transmission optimization
US9178583B2 (en) * 2013-01-08 2015-11-03 Samsung Electronics Co., Ltd. Channel state information feedback design in advanced wireless communication systems
EP3499737B1 (en) * 2014-03-24 2022-02-23 Huawei Technologies Co., Ltd. Precoding matrix indicator feedback method, receiving method, and apparatus
HUE049819T2 (hu) * 2014-05-22 2020-10-28 Qualcomm Inc Periodikus és aperiodikus csatornaállapot információ (CSI) jelentés MIMO-hoz
EP3327944A4 (en) * 2015-07-23 2019-03-20 LG Electronics Inc. CODE BOOK BASED SIGNAL TRANSMISSION AND RECEIVING METHOD IN A MULTI-ADVANCED WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR
US10200168B2 (en) * 2015-08-27 2019-02-05 Futurewei Technologies, Inc. Systems and methods for adaptation in a wireless network
US10263746B2 (en) * 2015-11-05 2019-04-16 Telefonaktiebolaget Lm Ericsson (Publ) Methods and systems for CSI-RS port selection for CSI-reporting
WO2017090987A1 (ko) * 2015-11-23 2017-06-01 엘지전자(주) 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 이를 위한 장치
KR20180098592A (ko) * 2015-12-23 2018-09-04 노키아 솔루션스 앤드 네트웍스 오와이 다중-입력 및 다중-출력(mimo) 무선 네트워크들에 대한 희소 상관 매트릭스의 피드백
US10230441B2 (en) * 2016-02-12 2019-03-12 Samsung Electronics Co., Ltd. Method and apparatus for channel status information feedback in mobile communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102170334A (zh) * 2011-05-03 2011-08-31 中兴通讯股份有限公司 信道质量指示信息的获取方法和装置
CN103326761A (zh) * 2012-03-19 2013-09-25 中兴通讯股份有限公司 信道状态信息处理方法及装置
CN103391127A (zh) * 2012-05-11 2013-11-13 上海贝尔股份有限公司 多点协作的信息反馈方法与装置
US20130343299A1 (en) * 2012-06-21 2013-12-26 Samsung Electronics Co., Ltd Method for cqi feedback without spatial feedback (pmi/ri) for tdd coordinated multi-point and carrier aggregation scenarios

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3432482A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112292879A (zh) * 2018-06-19 2021-01-29 日本电气株式会社 用于多trp/面板传输的csi测量
CN112292879B (zh) * 2018-06-19 2025-05-06 日本电气株式会社 用于多trp/面板传输的csi测量

Also Published As

Publication number Publication date
JP2019510419A (ja) 2019-04-11
US20190089437A1 (en) 2019-03-21
EP4195521A1 (en) 2023-06-14
CN107204794B (zh) 2020-02-21
US10790890B2 (en) 2020-09-29
CN107204794A (zh) 2017-09-26
EP3432482A1 (en) 2019-01-23
JP6692447B2 (ja) 2020-05-13
EP3432482A4 (en) 2019-03-27
KR102146438B1 (ko) 2020-08-20
KR20180124105A (ko) 2018-11-20
EP3432482B1 (en) 2023-03-29

Similar Documents

Publication Publication Date Title
CN107204794B (zh) 一种csi反馈方法及装置
US11923932B2 (en) Codebook subset restriction signaling
CN107181514B (zh) 一种csi反馈方法、预编码方法及装置
CN108271265B (zh) 通信方法、基站和终端设备
RU2676268C1 (ru) Предварительное кодирование передачи из одномерной антенной решетки, которая включает в себя совместно поляризованные антенные элементы, выровненные по одной линии в единственном пространственном измерении решетки
CN110034797B (zh) 一种预编码矩阵指示的反馈方法及装置
US10574409B2 (en) Information notification method and channel state information process execution method
WO2017152747A1 (zh) 一种csi反馈方法、预编码方法及装置
KR102151334B1 (ko) 데이터 전송 방법과 장치
CN108111211B (zh) 信道状态信息的反馈方法、装置及管理设备
CN107733494B (zh) 一种预编码方法、信道状态信息确定方法及装置
WO2017167156A1 (zh) Dmrs的发送方法及装置
WO2017076220A1 (zh) 一种信道状态信息csi反馈方法、终端及基站
CN104756415A (zh) 确定码本的预编码器
WO2017167157A1 (zh) 信道信息的处理方法及装置
CN107733495A (zh) 信道状态信息处理方法、装置、系统、终端及基站

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2018549253

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 20187030196

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2016894241

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2016894241

Country of ref document: EP

Effective date: 20181018

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16894241

Country of ref document: EP

Kind code of ref document: A1