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WO2017071674A1 - 一种信道状态信息的反馈方法、基站及终端 - Google Patents

一种信道状态信息的反馈方法、基站及终端 Download PDF

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Publication number
WO2017071674A1
WO2017071674A1 PCT/CN2016/113192 CN2016113192W WO2017071674A1 WO 2017071674 A1 WO2017071674 A1 WO 2017071674A1 CN 2016113192 W CN2016113192 W CN 2016113192W WO 2017071674 A1 WO2017071674 A1 WO 2017071674A1
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Prior art keywords
group
antenna port
csi
indication information
precoding
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PCT/CN2016/113192
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English (en)
French (fr)
Inventor
李传军
苏昕
宋扬
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to US15/771,079 priority Critical patent/US10193609B2/en
Priority to EP16859109.7A priority patent/EP3370348B1/en
Publication of WO2017071674A1 publication Critical patent/WO2017071674A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution
    • H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
    • H—ELECTRICITY
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
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    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
    • H—ELECTRICITY
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
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    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0645—Variable feedback
    • H04B7/065—Variable contents, e.g. long-term or short-short
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]
    • H—ELECTRICITY
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for feeding back channel state information, a base station, and a terminal.
  • MIMO Multiple-Input Multiple-Output
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced, LTE-A
  • OFDM Orthogonal Frequency Division Multiplexing
  • each antenna is connected to a transceiver with up to 128, 256, 512 digital antennas port.
  • the terminal needs to acquire or know the spatial channel information corresponding to these 128, 256, 512 digital antenna ports.
  • the acquisition of spatial channel information is directly dependent on the number of used channel state information reference signals (CSI-RS) for up to 128, 256, 512 digital antenna ports.
  • CSI-RS channel state information reference signals
  • the time-frequency resource overhead brought by a large number of CSI-RS is a technical problem faced by all-digital large-scale antennas. Therefore, it is necessary to design a channel state information feedback method that reduces the number of CSI-RS reference signals.
  • a channel state information feedback method based on CSI-RS usually has two methods, and a channel state information feedback method based on CSI-RS of an antenna unit is called a non-beam.
  • the no-beamformed CSI-RS, and the other is a channel state information feedback method based on the spatial beam distribution of the shaped CSI-RS, which is called beamformed CSI-RS.
  • the antenna unit of the configured antenna port has a small gain, and for the directional antenna, it is usually about 5-8 dBi.
  • Insufficient coverage This no-beamformed CSI-RS signal coverage is insufficient, which is mainly reflected in the coverage distance. Therefore, the channel state information estimated by the CSI-RS signal is inaccurate, thereby affecting system performance.
  • N beamformed beams For the channel state information feedback method of beamformed CSI-RS, a plurality of beamformed beams with higher gains are configured, which are called N beamformed beams. Since the N beamformed beams have a shaping gain, there is no insufficient coverage of the coverage distance like the no-beamformed CSI-RS signal. However, there will be a shortage of coverage angles. There are two reasons for this deficiency: First, the N beamformed beams are related to the angle range. To make the beamformed beam cover the entire angular range, N needs to be larger, and N becomes larger, which brings significant time-frequency resource overhead. If N becomes smaller, the coverage angle is insufficient. Second, the base station does not know the distribution range of the UE. Therefore, setting the number N of specific beamformed beams for a specific range may also result in the performance improvement of the beamformed beam that cannot be used by the UE outside the specific range, thereby affecting the system. performance.
  • the technical problem to be solved by the present invention is to provide a feedback method, a base station and a terminal for channel state information.
  • an embodiment of the present invention provides a method for feeding back channel state information, including:
  • the same intra-group codebook set consisting of multiple intra-precoding matrices for each antenna port group, Assigning, to each antenna port group, a plurality of different reference signals corresponding to the same reference resource, and configuring, for each antenna port in each antenna port group, a precoding reference signal obtained by precoding the precoding matrix in the group
  • the number of the reference resources corresponds to the number of intra-group precoding matrices in the codebook set in the group
  • the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group
  • the channel state information CSI that the receiving terminal feeds back based on the measurement of the reference signal.
  • the step of dividing the multiple antenna ports into multiple antenna port groups is specifically:
  • each row or column of antenna ports of the plurality of antenna ports are respectively grouped by the same grouping method.
  • the step of grouping each row or column of the plurality of antenna ports by using the same grouping method according to one dimension of the antenna port is specifically:
  • Each M antenna port in each column of the vertical direction is divided into a group, and the number of groups of each column antenna port is the same;
  • M is the number of preset antenna ports included in each group.
  • the reference resource is a signal state information-reference signal CSI-RS resource, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrices of the CSI-RS signals are different, and the formed beam directions are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • the step of transmitting the precoding reference signal to the terminal on each antenna port is specifically:
  • the CSI-RS resource is a frequency domain resource, sending the precoding reference signal to the terminal on each antenna port in the same subframe;
  • the precoding reference signal is sent to the terminal on each antenna port in a different subframe.
  • the channel state information CSI includes: intra-group precoding matrix indication information, inter-group precoding matrix indication information, rank indication information, and channel quality indication information.
  • the channel state information CSI can be obtained as follows:
  • the reference signals of the reference resources are respectively measured by the terminal, and the in-group precoding matrix indication information that needs to be fed back to the base station is obtained.
  • the reference signals of the reference resources corresponding to the in-group precoding matrix indication information are obtained on each antenna port group.
  • the channel information, the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information that are fed back to the base station are obtained; the intra-coding precoding matrix indication information and the inter-group precoding matrix indication information are used.
  • the rank indication information and the channel quality indication information are used as CSI.
  • the method for measuring the reference signals of the intra-group pre-coding matrix that needs to be fed back to the base station by using the terminal to measure the reference signals of the reference resources separately is:
  • the inner precoding matrix indicates information.
  • the implementation manner of obtaining the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information that is fed back to the base station according to the channel information is:
  • inter-coding precoding matrix indication information according to the channel information and the pre-configured inter-group codebook set, and acquiring rank indication information and channel quality indication information according to the channel information.
  • An embodiment of the present invention provides a base station, including:
  • a grouping module configured to divide multiple antenna ports into multiple antenna port groups
  • a configuration module configured to configure, for each antenna port group, the same intra-group code set formed by multiple intra-precoding matrices, and allocate, for each antenna port group, different reference signals corresponding to the same reference resource, and Each antenna port in each antenna port group is configured with a precoding reference signal obtained by precoding the precoding matrix in the group; wherein the number of the reference resources is within a group in the codebook set in the group The number of precoding matrices corresponds to each other, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group;
  • a first sending module configured to send the precoding reference signal to the terminal on each antenna port
  • the first receiving module is configured to receive, by the terminal, channel state information CSI that is fed back based on the measurement of the reference signal.
  • the grouping module is specifically configured to:
  • each row or column of antenna ports of the plurality of antenna ports are respectively grouped by the same grouping method.
  • the reference resource is a signal state information-reference signal CSI-RS resource, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrices of the CSI-RS signals are different, and the formed beam directions are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • the first sending module is specifically configured to:
  • the CSI-RS resource is a frequency domain resource, sending the precoding reference signal to the terminal on each antenna port in the same subframe;
  • the precoding reference signal is sent to the terminal on each antenna port in a different subframe.
  • An embodiment of the present invention provides a base station, including:
  • a processor and a memory coupled to the processor via a bus interface, the memory for storing programs and data used by the processor when performing operations, when the processor calls and executes the memory stored in the memory
  • the program and data are implemented, the following functional modules are implemented:
  • a grouping module configured to divide multiple antenna ports into multiple antenna port groups
  • a configuration module configured to configure, for each antenna port group, the same intra-group code set formed by multiple intra-precoding matrices, and allocate, for each antenna port group, different reference signals corresponding to the same reference resource, and
  • Each antenna port in each antenna port group is configured with a precoding reference signal obtained by precoding the precoding matrix in the group; wherein the number of the reference resources is within a group in the codebook set in the group
  • the number of precoding matrices corresponds to the reference signal corresponding to each reference resource
  • the number corresponds to the number of antenna port groups between groups;
  • a first sending module configured to send the precoding reference signal to the terminal on each antenna port
  • the first receiving module is configured to receive, by the terminal, channel state information CSI that is fed back based on the measurement of the reference signal.
  • An embodiment of the present invention provides a method for feeding back channel state information, including:
  • the antenna port is divided into multiple antenna port groups and configured for each antenna port group, and the base station configures each antenna port group by the base station.
  • a precoding reference signal obtained by precoding the intra-coding precoding matrix; wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the intra-group codebook set, and corresponding to each reference resource
  • the number of reference signals corresponds to the number of antenna port groups between groups;
  • the acquired CSI is sent to the base station.
  • the step of measuring the reference signal corresponding to the reference resource, and acquiring the channel state information CSI includes:
  • the reference signals of the respective reference resources are separately measured, and the in-group precoding matrix indication information that needs to be fed back to the base station is obtained;
  • inter-group precoding matrix indication information Obtaining inter-group precoding matrix indication information, rank indication information, and channel quality indication information that are fed back to the base station according to the channel information;
  • the intra-group precoding matrix indication information and inter-group precoding matrix indication information, rank indication information, and channel quality indication information are used as CSI.
  • the step of separately measuring the reference signals of the reference resources and obtaining the in-group precoding matrix indication information that needs to be fed back to the base station is specifically:
  • the precoding matrix indication information corresponding to the RSRP with the largest average value is obtained, and the precoding matrix indication information is used as the in-group precoding matrix indication information.
  • the step of acquiring the channel information of each reference signal of the reference resource corresponding to the reference resource in the in-group precoding matrix indication information on each antenna port group includes:
  • the step of obtaining inter-group precoding matrix indication information, rank indication information, and channel quality indication information that is fed back to the base station according to the channel information includes:
  • rank indication information and channel quality indication information are acquired.
  • the reference resource is a signal state information-reference signal CSI-RS resource, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrices of the CSI-RS signals are different, and the formed beam directions are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • the embodiment of the invention provides a terminal, including:
  • a second receiving module configured to receive a reference signal corresponding to multiple reference resources sent by the base station, where the reference signal is that the base station divides the antenna port into multiple antenna port groups and is configured for each antenna port group, and the base station is
  • Each antenna port group is configured with the same intra-group codebook set composed of multiple intra-precoding matrices, and each antenna port group is allocated with different reference signals corresponding to the same reference resource, and is configured for each antenna port group.
  • Each of the antenna ports is configured with a precoding reference signal obtained by precoding the precoding matrix in the group; wherein the number of the reference resources is compared with the number of precoding matrices in the group in the set of codebooks in the group Correspondingly, the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group;
  • a second sending module configured to send the acquired CSI to the base station.
  • the obtaining module includes:
  • a first acquiring submodule configured to separately measure reference signals of each reference resource, and obtain in-group precoding matrix indication information that needs to be fed back to the base station;
  • a second acquiring submodule configured to acquire channel information of each reference signal of each reference port group corresponding to the reference resource corresponding to the precoding matrix indication information in the group;
  • a third obtaining submodule configured to obtain, according to the channel information, inter-group precoding matrix indication information, rank indication information, and channel quality indication information that are fed back to the base station;
  • the intra-group precoding matrix indication information and inter-group precoding matrix indication information, rank indication information, and channel quality indication information are used as CSI.
  • the first obtaining submodule includes:
  • a calculating unit configured to calculate an average value of reference signal received power RSRP received by the reference signal of each reference resource on all antenna port groups;
  • the first acquiring unit is configured to obtain precoding matrix indication information corresponding to the RSRP with the largest average value, and use the precoding matrix indication information as the in-group precoding matrix indication information.
  • the third obtaining submodule includes:
  • a second acquiring unit configured to acquire inter-group precoding matrix indication information according to the channel information and a pre-configured inter-group codebook set;
  • a third acquiring unit configured to acquire rank indication information and channel quality indication information according to the channel information.
  • the embodiment of the invention provides a terminal, including:
  • a processor and a memory coupled to the processor via a bus interface, the memory for storing programs and data used by the processor when performing operations, when the processor calls and executes the memory stored in the memory
  • the program and data are implemented, the following functional modules are implemented:
  • a second receiving module configured to receive a reference signal corresponding to multiple reference resources sent by the base station, where the reference signal is that the base station divides the antenna port into multiple antenna port groups and is configured for each antenna port group, and the base station is
  • Each antenna port group configuration is the same as that consisting of multiple intra-precoding matrices
  • the intra-group code set, each antenna port group is assigned a plurality of different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be pre-coded by the intra-group precoding matrix.
  • the obtained precoding reference signal wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the in-codebook set, and the number of reference signals corresponding to each reference resource and the inter-group antenna port group Corresponding to the number;
  • a second sending module configured to send the acquired CSI to the base station.
  • the antenna ports on the base station are grouped; then the reference signals of the reference resources in the antenna port group are beamformed, and the reference signals of the reference resources between the antenna port groups are not beamformed;
  • the method of non-beam shaping and intra-group beamforming performs the transmission of the reference signal, which solves the problem that the reference signal is transmitted in a single manner in the prior art, and the reference signal is insufficient in the coverage distance or the coverage angle range;
  • the configuration mode makes the reference signal of the transmitted reference resource more reasonable, and ensures the coverage distance and coverage angle range of the reference signal.
  • FIG. 1 is a schematic flowchart of a method for feeding back channel state information according to Embodiment 1 of the present invention
  • FIG. 2 is a schematic flowchart of a method for feeding back channel state information according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic diagram showing a grouping state of an antenna port
  • FIG. 4 is a schematic block diagram of a base station according to Embodiment 3 of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic flowchart of a method for feeding back channel state information according to Embodiment 5 of the present invention.
  • FIG. 7 is a schematic flowchart diagram of a method for feeding back channel state information according to Embodiment 6 of the present invention.
  • FIG. 8 is a block diagram showing a terminal of a seventh embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a terminal according to Embodiment 8 of the present invention.
  • the present invention provides a channel state information feedback method, a base station, and a terminal in the feedback method of the existing channel state information, because the reference signal is sent unreasonably, the channel state information fed back by the terminal is inaccurate, and the system performance is affected. Therefore, the coverage distance and coverage angle range of the reference signal are guaranteed.
  • the method for feeding back channel state information includes:
  • Step 11 dividing the plurality of antenna ports into a plurality of antenna port groups
  • the antenna ports on the base station are provided with multiple transmit/receive signals, and these antenna ports are managed in the form of packets, that is, each packet can be regarded as a large antenna port, thus reducing the overall antenna.
  • the number of ports which in turn reduces the number of signals sent to the terminal.
  • Step 12 Configure, for each antenna port group, the same intra-group codebook set composed of multiple intra-precoding matrices, and allocate, for each antenna port group, different reference signals corresponding to the same reference resource, and for each Each antenna port in the antenna port group is configured with a precoding reference signal obtained by precoding the precoding matrix in the group;
  • the number of the reference resources corresponds to the number of intra-group precoding matrices in the codebook set in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group.
  • a reference signal needs to be configured on each antenna port group for each reference resource, and the packets are sent between the groups.
  • the reference signal is not beamformed, that is, the non-beamforming mode is used to perform reference signal configuration between groups; and each antenna port group needs to separately transmit one of a plurality of reference resources, and the reference is sent in the group.
  • the signal needs to be beamformed, that is, the beamforming method is used in the group to configure the reference signal, and the reference signal is transmitted according to the non-beamforming configuration and the beamforming configuration in the group to ensure the antenna port as much as possible.
  • the transmitted reference signal has a good coverage angle range and coverage distance.
  • Step 13 Send the precoding reference signal to the terminal on each antenna port
  • the reference resource when the reference resource is sent, the reference resource only needs to be sent according to the configuration in step 12 above. It should be noted that since one reference signal needs to be sent on multiple antenna ports on the antenna port group, one antenna port in each antenna port group is sent. Is a precoded reference signal of a reference signal. However, when the terminal receives, it receives in the form of a reference signal, that is, the terminal receives the reference signal sent by each antenna port group.
  • Step 14 Receive channel state information CSI fed back by the terminal based on the measurement of the reference signal.
  • the feedback method of the channel state information is applied to the base station side.
  • the reference resource is a CSI-RS resource
  • the reference signal is a CSI-RS signal
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrices of the CSI-RS signals are different, and the formed beam directions are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • each antenna port group has a CSI-RS signal transmission.
  • the base station configures one CSI for transmitting one CSI-RS resource on each antenna port group.
  • -RS signal ; and it should be noted that the base station sends multiple CSI-RS resources to the terminal, so when transmitting the multiple CSI-RS resources, one CSI-RS is configured to be sent on each antenna port group.
  • a CSI-RS signal of a resource if there are Q CSI-RS resources to be transmitted, Q CSI-RS signals are transmitted on each antenna port group, and CSI-RS signals on the same antenna port group have different assignments.
  • Shape beam pointing For the above configuration, the shaping beams configured for the same CSI-RS resource in each antenna port group are the same, and the shaping beams configured for different CSI-RS resources are different.
  • the CSI-RS resources in the present invention may be differentiated by using frequency domain resources, or may be differentiated by using time domain resources. It should be noted that when multiple CSI-RS resources are frequency domain resources, the base station may perform the above configuration. a precoding reference signal for transmitting a reference signal to a terminal on each antenna port in the same subframe; when a plurality of CSI-RS resources are time domain resources, the base station needs to be in each subframe in different subframes according to the foregoing configuration. A precoded reference signal for transmitting a reference signal to the terminal on the port.
  • the terminal after receiving the CSI-RS signals of multiple CSI-RS resources sent by the base station on multiple antenna port groups, the terminal needs to be based on the received multiple CSI-RS resources.
  • the CSI usually includes, but is not limited to, intra-group precoding matrix indication information, inter-coding precoding matrix indication information, and rank. Indication (RI) information and channel quality indication (CQI) information.
  • the reference signals of the reference resources are respectively measured by the terminal, and the in-group precoding matrix indication information that needs to be fed back to the base station is obtained.
  • the reference signals of the reference resources corresponding to the in-group precoding matrix indication information are obtained on each antenna port group.
  • the channel information, the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information that are fed back to the base station are obtained; the intra-coding precoding matrix indication information and the inter-group precoding matrix indication information are used.
  • the rank indication information and the channel quality indication information are used as CSI.
  • the terminal side acquires the CSI that needs to be fed back to the base station in the foregoing manner.
  • the specific implementation manner of the intra-group precoding matrix indication information that needs to be fed back to the base station by using the reference signal of each reference resource by the terminal is as follows:
  • the inner precoding matrix indicates information.
  • the specific implementation manner of obtaining the channel information of each reference signal of the reference resource corresponding to the reference resource in the intra-group precoding matrix indication information on each antenna port group is:
  • the specific implementation manner of obtaining the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information that is fed back to the base station according to the channel information is:
  • inter-coding precoding matrix indication information according to the channel information and the pre-configured inter-group codebook set, and acquiring rank indication information and channel quality indication information according to the channel information.
  • the base station after receiving the CSI fed back by the terminal, the base station first calculates a three-dimensional precoding matrix according to the intra-group precoding matrix indication information and the inter-group precoding matrix indication information in the CSI, and then according to the three-dimensional precoding matrix and the CSI.
  • the rank indication information and the channel quality indication information are subjected to link adaptation calculation.
  • the antenna ports on the base station are grouped; then, in the antenna port group
  • the reference signal of the reference resource is beamformed, and the reference signal of the reference resource between the antenna port groups is not beamformed; the reference signal is transmitted by means of non-beamforming and intra-group beamforming.
  • the reference signal is transmitted in a single manner, which causes the reference signal to be insufficient in the coverage distance or the coverage angle range; the foregoing configuration manner makes the reference signal of the transmitted reference resource more reasonable, and the reference signal is ensured. Covering distance and coverage angle range; simultaneously transmitting a reference signal through multiple antenna port combinations, reducing the number of reference signal transmissions, saving channel resources and improving system efficiency.
  • the method for feeding back channel state information includes:
  • Step 21 grouping, according to one dimension of the antenna port, each row or column of the plurality of antenna ports by using the same grouping manner;
  • the antenna ports in the base station are generally divided into antenna ports in the vertical direction and antenna ports in the horizontal direction.
  • the grouping of antenna ports is usually performed in only one direction.
  • Step 22 Configure, for each antenna port group, the same intra-group codebook set composed of multiple intra-precoding matrices, and allocate, for each antenna port group, different reference signals corresponding to the same reference resource, and for each Each antenna port in the antenna port group is configured with a precoding reference signal obtained by precoding the precoding matrix in the group;
  • the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group;
  • Step 23 Send the precoding reference signal to the terminal on each antenna port
  • Step 24 Receive channel state information CSI fed back by the terminal based on the measurement of the reference signal.
  • the step 21 may include:
  • Step 211 each M antenna port in each column of the vertical direction is divided into a group, and the number of groups of each column antenna port is the same;
  • M is the number of preset antenna ports included in each group.
  • the division of the packet is not performed in the horizontal direction, and the division of the packet is performed in the vertical direction.
  • the number of signals transmitted is reduced, and channel resources are saved.
  • the N antenna ports of the large-scale antenna are divided into P groups, and the antenna ports in the horizontal direction are kept unchanged.
  • Each of the vertical antenna ports is divided into a group of M antenna ports, and each column is divided into three groups.
  • the group forms a group P antenna port, wherein the group P antenna port is composed of a horizontal antenna port and a vertical antenna port, and each group antenna port has M antenna ports.
  • the number of antenna ports in the vertical direction is the number of antenna ports in the horizontal direction.
  • the Q CSI-RS resources may be frequency domain resources or time domain resources.
  • the Q CSI-RS signals of the Q CSI-RS resources in the same group correspond to the Q beams in different directions pointing in the coverage angle range, and the Q beams in different directions are M antennas in the group.
  • the port is formed by precoding matrix indication information (PMI) within the group.
  • PMI precoding matrix indication information
  • the base station configures an inner codebook set of the M*Q dimension group (indicated as), that is, the intra-group precoding matrix (indicated as) in which the M Mx1 dimensions are included, and the corresponding PMI is the intra-group precoding matrix indication information ( Recorded as).
  • the base station configures a P*NFFT inter-group codebook set (denoted as), that is, an inter-group precoding matrix (indicated as) in which NFFT dimensions are included, and the corresponding PMI is an intra-group precoding matrix indication information. Therefore, the value of NFFT is usually 32.
  • the base station sends the Q CSI-RS resources to the terminal according to the CSI-RS resource type, and each CSI-RS resource includes the CSI-RS signal sent on the P packets, if the Q CSI-RS resources are frequency domain resources. If they are differentiated, they are sent on the same subframe. If the Q CSI-RS resources are differentiated by time domain resources, they are sent on different subframes.
  • the base station has a total of 64 (8 ⁇ 8) antenna ports, that is, there are 8 antenna ports in each column in the vertical direction, and 8 antenna ports in each row in the horizontal direction, which are vertically arranged on each column.
  • the antenna port is divided into one group for each of the four antenna ports, and two groups are divided in each column in the vertical direction, so that The 64 antenna ports are divided into 16 groups, such as P1, P2, ..., P16 in FIG.
  • Each group carries CSI-RS signals in multiple CSI-RS resources, and each group only carries one CSI-RS signal of each CSI-RS resource;
  • each CSI-RS resource For example, it is now necessary to transmit two time domain CSI-RS resources, divide each CSI-RS resource into 16 CSI-RS signals, and carry each CSI on the P1 group, the P2 group, and the P16 group, respectively.
  • a CSI-RS signal of the RS resource, and one CSI-RS signal of each CSI-RS resource is sent on the corresponding packet carrying the signal.
  • the P1 group carries the CSI-RS signal 1 of the first CSI-RS resource and the CSI-RS signal 1 of the second CSI-RS resource
  • the P2 group carries the CSI-RS signal 2 of the second CSI-RS resource and The CSI-RS signal 2 of the second CSI-RS resource, and so on.
  • the CSI-RS signals of the first CSI-RS resource division are respectively S101, S102...S116;
  • the CSI-RS signals of the second CSI-RS resource division are respectively S201, S202...S216;
  • the first CSI-RS resource and the second CSI-RS resource are sent in different subframes, and S101 and S201 are sent by the P1 group, S102 and S202 are sent by the P2 group, and so on.
  • the antenna ports on the base station are grouped; the CSI-RS signals of the CSI-RS resources in the antenna port group are beamformed, and the CSI-RS resources of the CSI-RS resources between the antenna port groups are used.
  • the signal is not beamformed; the CSI-RS signal is transmitted by means of non-beamforming and intra-group beamforming, which solves the problem of CSI-RS signal transmission in a single mode in the prior art, resulting in CSI -
  • an embodiment of the present invention provides a base station 40, including:
  • a grouping module 41 configured to divide multiple antenna ports into multiple antenna port groups
  • the configuration module 42 is configured to configure, for each antenna port group, the same intra-group codebook set composed of multiple intra-precoding matrices, and allocate different reference parameters corresponding to the same reference resource for each antenna port group. Testing a signal, and configuring, for each antenna port in each antenna port group, a precoded reference signal obtained by precoding the precoding matrix in the group;
  • the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group;
  • the first sending module 43 is configured to send the precoding reference signal to the terminal on each antenna port;
  • the first receiving module 44 is configured to receive channel state information CSI that the terminal feeds back based on the measurement of the reference signal.
  • the grouping module 41 is configured to:
  • each row or column of antenna ports of the plurality of antenna ports are respectively grouped by the same grouping method.
  • the grouping module 51 may be implemented by dividing each of the antenna ports in each column of the vertical direction into a group, each column of the antenna port.
  • the number of groups is the same;
  • M is the number of preset antenna ports included in each group.
  • the reference resource is a signal state information-reference signal CSI-RS resource, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrices of the CSI-RS signals are different, and the formed beam directions are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • the first sending module 43 is specifically configured to: send the precoding reference signal to the terminal on each antenna port in the same subframe; or
  • the first sending module 43 is specifically configured to: send the precoding reference signal to the terminal on each antenna port in different subframes.
  • the reference signals of the respective reference resources are separately measured by the terminal, and the feedback needs to be fed to the base.
  • the intra-group precoding matrix indication information of the station acquiring channel information of each reference signal of the reference resource corresponding to the reference resource in the intra-group precoding matrix indication information on each antenna port group; and obtaining feedback between the groups according to the channel information Precoding matrix indication information, rank indication information, and channel quality indication information; the intra-group precoding matrix indication information and inter-group precoding matrix indication information, rank indication information, and channel quality indication information are used as CSI.
  • the specific implementation manner of the intra-group precoding matrix indication information that needs to be fed back to the base station by using the terminal to measure the reference signals of the respective reference resources separately is:
  • the inner precoding matrix indicates information.
  • the specific implementation manner of acquiring the channel information of each reference signal of the reference resource corresponding to the reference resource in the intra-group precoding matrix indication information on each antenna port group is:
  • the specific implementation manner of obtaining the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information that is fed back to the base station according to the channel information is:
  • inter-coding precoding matrix indication information according to the channel information and the pre-configured inter-group codebook set, and acquiring rank indication information and channel quality indication information according to the channel information.
  • the embodiment of the base station is a base station corresponding to the above-mentioned feedback method embodiment. All the implementation manners of the foregoing feedback method embodiments are applicable to the embodiment of the base station, and the same technical effects can be achieved.
  • this embodiment provides a base station, including:
  • a processor 51 a processor 51; and a memory 53 connected to the processor 51 via a bus interface 52, the memory 53 for storing programs and data used by the processor 51 when performing operations, when the processor 51 calls and When the program and data stored in the memory 53 are executed, the following functional modules are implemented:
  • a grouping module configured to divide multiple antenna ports into multiple antenna port groups
  • a configuration module configured to configure, for each antenna port group, a phase consisting of multiple intra-precoding matrices The same intra-group code set, each antenna port group is assigned a plurality of different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be pre-processed through the intra-group precoding matrix.
  • a precoded reference signal obtained by encoding
  • the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group;
  • a first sending module configured to send the precoding reference signal to the terminal on each antenna port
  • the first receiving module is configured to receive, by the terminal, channel state information CSI that is fed back based on the measurement of the reference signal.
  • the processor 51 is also used to implement the functions of any other module of the above base station.
  • the method for feeding back channel state information includes:
  • Step 61 Receive a reference signal corresponding to multiple reference resources sent by the base station.
  • the reference signal is that the base station divides the antenna port into multiple antenna port groups and is configured for each antenna port group, and the base station configures the same for each antenna port group by multiple intra-precoding matrices.
  • the intra-group code set, each antenna port group is assigned a plurality of different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be pre-coded by the intra-group precoding matrix.
  • the obtained precoding reference signal wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the in-codebook set, and the number of reference signals corresponding to each reference resource and the inter-group antenna port group The number corresponds.
  • the reference resource is usually a CSI-RS resource sent by the base station, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrix of the CSI-RS signal is different, and the formed beam is formed.
  • the pointing beams are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • Step 62 Perform measurement on the reference signal corresponding to the reference resource, and obtain channel state information CSI;
  • the reference resource is usually a CSI-RS resource sent by the base station, and the reference signal is a CSI-RS signal, and the terminal performs resource selection and channel according to the CSI-RS signal corresponding to the received CSI-RS resource. Measure and get the CSI that requires feedback.
  • Step 63 Send the acquired CSI to the base station.
  • the feedback method is applied to the terminal side, and the terminal side receives the CSI-RS signal of the CSI-RS resource sent by the base station on the configured antenna port group, because the CSI-RS signal is an antenna.
  • the port group receives, so the number of CSI-RS signals received by the terminal is reduced, the delay of processing the CSI-RS signal by the terminal is reduced, and the feedback efficiency is improved.
  • the method for feeding back channel state information includes:
  • Step 71 Receive a reference signal corresponding to multiple reference resources sent by the base station.
  • the reference signal is that the base station divides the antenna port into multiple antenna port groups and configures the antenna port groups, and the base station configures each antenna port group with the same group of multiple intra-precoding matrices.
  • a codebook set each antenna port group is allocated with different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be precoded by the intra-group precoding matrix.
  • Precoding the reference signal wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group .
  • Step 72 Perform measurement on the reference signals of the respective reference resources, and obtain in-group precoding matrix indication information that needs to be fed back to the base station;
  • the optimal shaped beam needs to be acquired according to the reference signal, and the shaped beam is generated by the intra-group precoding matrix indication information, so in step 72,
  • the intra-group precoding matrix indication information that needs to be fed back may be obtained according to the reference signal corresponding to the received reference resource.
  • Step 73 Acquire each reference signal of the reference resource corresponding to the precoding matrix indication information in the group. Channel information on each antenna port group;
  • Step 74 Obtain inter-group precoding matrix indication information, rank indication information, and channel quality indication information that are fed back to the base station according to the channel information.
  • the intra-group precoding matrix indication information and the inter-coding precoding matrix indication information, the rank indication information, and the channel quality indication information are fed back to the base station as CSI.
  • Step 75 Send the acquired CSI to the base station.
  • the terminal side also obtains the hierarchical acquisition when performing CSI acquisition, that is, first obtains the intra-group precoding matrix indication information, by the group.
  • the inner precoding matrix indication information determines which reference resource needs to be fed back, and then performs measurement of the channel of the reference resource to generate all the information contained in the CSI that needs feedback.
  • the step 72 may include:
  • Step 721 Calculate an average value of reference signal received power (RSRP) received by the reference signal of each reference resource on all antenna port groups;
  • RSRP reference signal received power
  • the base station When the base station is transmitting CSI-RS resources, when the terminal is receiving, the CSI-RS signals of the same CSI-RS resource on each antenna port group have one RSRP, and these CSI-RS signals of the same CSI-RS resource are used.
  • the RSRP performs averaging operation so that each CSI-RS resource corresponds to an average value of one RSRP (for example, according to the transmission situation in FIG. 3, when the terminal side performs RSRP calculation, according to S101, S102...
  • the RSRP of S116 obtains an average value of RSRPs of the first CSI-RS resource, and acquires an average value of RSRPs of the second CSI-RS resource according to RSRPs of S201, S202...S216.
  • Step 722 Obtain precoding matrix indication information corresponding to the RSRP with the largest average value, and use the precoding matrix indication information as the in-group precoding matrix indication information.
  • the precoding matrix indication information for the CSI-RS resource is selected as the feedback.
  • the intra-group precoding matrix indicates information.
  • the step 73 may include:
  • Step 731 Perform channel measurement on reference signals on all antenna port groups of reference resources corresponding to the intra-precoding matrix indication information in the group, and obtain channel information corresponding to each antenna port group.
  • the step 74 when specifically implemented, may include:
  • Step 741 Acquire inter-group precoding matrix indication information according to the channel information and the pre-configured inter-group codebook set.
  • the inter-group precoding matrix indication information is mainly obtained, and the channel information is respectively calculated with each precoding matrix indication information in the inter-group codebook set to obtain an optimal precoding of the operation result.
  • the matrix indicates information, and the optimal precoding matrix indication information is used as inter-group precoding matrix indication information that needs feedback.
  • Step 742 Acquire rank indication information and channel quality indication information according to the channel information.
  • rank indication information and the channel quality indication information to be fed back in the present invention can be obtained in the manner of obtaining the rank indication information and the channel quality indication information in the prior art, and will not be described in detail herein.
  • the feedback process on the terminal side is specifically:
  • the terminal receives CSI-RS signals of Q CSI-RS resources of P groups, calculates an average value of RSRPs received by each CSI-RS resource in P groups, compares Q RSRP values, and selects a maximum RSRP.
  • the corresponding PMI is an intra-group precoding matrix indication information (denoted) that requires feedback.
  • S22 Select a received signal of the P CSI-RS signals corresponding to the corresponding CSI-RS resource to perform channel measurement, and obtain channel information corresponding to the antenna ports of the P groups (indicated as);
  • NRxAnt is the number of receiving antennas of the terminal, and C represents the dimension.
  • the terminal calculates inter-group precoding matrix indication information (reported as) according to the inter-group codebook set (); and calculates RI information and CQI information according to the calculation;
  • the RI information and the CQI information obtained in the foregoing step are fed back to the base station as the CSI, so that the base station side selects the corresponding intra-group precoding matrix according to the Mx1 dimension corresponding to the selection.
  • Inter-precoding matrix (denoted), and calculate a three-dimensional precoding matrix; Wherein, it is a matrix; the base station performs link adaptation parameter calculation according to the calculated RI information and CQI information fed back by the terminal.
  • the two-stage CSI-RS resource configuration includes: intra-group shaped CSI-RS resource configuration, non-formed CSI-RS signal configuration between groups; and inter-group CSI-RS resource configuration selection is applicable to the terminal.
  • the shaped beam pointing, through the non-shaped CSI-RS signal configuration between the groups, solves the coverage distance of the no-beamformed CSI-RS method based on the antenna port and the beamformed CSI-RS method coverage angle of all antenna ports based on the vertical direction.
  • the problem of insufficient range achieves more accurate 3D beam transmission; at the same time, the number of CSI-RS signals transmitted is reduced, channel resources are saved, and system efficiency is improved.
  • an embodiment of the present invention provides a terminal 80, including:
  • the second receiving module 81 is configured to receive a reference signal corresponding to multiple reference resources sent by the base station;
  • the reference signal is that the base station divides the antenna port into multiple antenna port groups and configures the antenna port groups, and the base station configures each antenna port group with the same group of multiple intra-precoding matrices.
  • a codebook set each antenna port group is allocated with different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be precoded by the intra-group precoding matrix.
  • Precoding the reference signal wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group ;
  • the obtaining module 82 is configured to perform measurement on the reference signal corresponding to the reference resource, and acquire channel state information CSI;
  • the second sending module 83 is configured to send the acquired CSI to the base station.
  • the reference resource is a signal state information-reference signal CSI-RS resource, and the reference signal is a CSI-RS signal;
  • the number of CSI-RS resources is the same as the number of intra-group precoding matrices in the codebook set in the group, and the number of CSI-RS signals corresponding to each CSI-RS resource is the same as the number of antenna port groups in the group;
  • All CSI-RS signals corresponding to the same CSI-RS resource have the same in-group precoding matrix in each antenna port group, and the formed shaped beams point to the same, corresponding to different CSI-RS resources in the same antenna port group.
  • the intra-group precoding matrix of the CSI-RS signal is different, and the formed beam is formed.
  • the pointing beams are different, and the shaped beams formed by the precoding matrices in different groups are directed to uniformly cover the entire coverage angle range in the vertical direction.
  • the method includes:
  • a first acquiring submodule configured to separately measure reference signals of each reference resource, and obtain in-group precoding matrix indication information that needs to be fed back to the base station;
  • a second acquiring submodule configured to acquire channel information of each reference signal of each reference port group corresponding to the reference resource corresponding to the precoding matrix indication information in the group;
  • a third obtaining submodule configured to obtain, according to the channel information, inter-group precoding matrix indication information, rank indication information, and channel quality indication information that are fed back to the base station;
  • the intra-group precoding matrix indication information and inter-group precoding matrix indication information, rank indication information, and channel quality indication information are used as CSI.
  • the first obtaining submodule includes:
  • a calculating unit configured to calculate an average value of reference signal received power RSRP received by the reference signal of each reference resource on all antenna port groups;
  • the first acquiring unit is configured to obtain precoding matrix indication information corresponding to the RSRP with the largest average value, and use the precoding matrix indication information as the in-group precoding matrix indication information.
  • the second acquiring sub-module is specifically configured to: perform channel measurement on reference signals on all antenna port groups of reference resources corresponding to the intra-precoding matrix indication information in the group, and obtain corresponding to each antenna port group. Channel information.
  • the third obtaining submodule includes:
  • a second acquiring unit configured to acquire inter-group precoding matrix indication information according to the channel information and a pre-configured inter-group codebook set;
  • a third acquiring unit configured to acquire rank indication information and channel quality indication information according to the channel information.
  • the embodiment of the terminal is a terminal corresponding to the foregoing method of the feedback method. All the implementation manners of the foregoing feedback method embodiments are applicable to the embodiment of the terminal, and the same technical effects can be achieved.
  • the embodiment provides a terminal, including:
  • a processor 93 a processor 93; and a memory 93 connected to the processor 91 via a bus interface 92, the memory 93 for storing programs and data used by the processor 91 when performing operations, when the processor 91 calls and When the program and data stored in the memory 93 are executed, the following functional modules are implemented:
  • a second receiving module configured to receive a reference signal corresponding to multiple reference resources sent by the base station
  • the reference signal is that the base station divides the antenna port into multiple antenna port groups and configures the antenna port groups, and the base station configures each antenna port group with the same group of multiple intra-precoding matrices.
  • a codebook set each antenna port group is allocated with different reference signals corresponding to the same reference resource, and each antenna port in each antenna port group is configured to be precoded by the intra-group precoding matrix.
  • Precoding the reference signal wherein the number of the reference resources corresponds to the number of intra-group precoding matrices in the set of codebooks in the group, and the number of reference signals corresponding to each reference resource corresponds to the number of antenna port groups in the group .
  • a second sending module configured to send the acquired CSI to the base station.
  • the processor 91 is also used to implement the functions of any of the other modules of the feedback device described above.

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Abstract

本发明提供一种信道状态信息的反馈方法、基站及终端，涉及通信领域。该反馈方法，包括：将多个天线端口划分为多个天线端口组；为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过组内预编码矩阵进行预编码而得到的预编码参考信号；且参考资源的数量与组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；在各天线端口上向终端发送预编码参考信号；接收终端基于对参考信号的测量而反馈的信道状态信息CSI。本方案，保证了天线端口发送的参考信号的覆盖距离与覆盖角度范围。

Description

一种信道状态信息的反馈方法、基站及终端
相关申请的交叉引用
本申请主张在2015年10月29日在中国提交的中国专利申请No.201510717212.6的优先权，其全部内容通过引用包含于此。
技术领域
本发明涉及通讯技术领域，特别涉及一种信道状态信息的反馈方法、基站及终端。
背景技术
鉴于多输入多输出(Multiple-Input Multiple-Output，MIMO)技术对于提高峰值速率与系统频谱利用率的重要作用，长期演进(Long Term Evolution，LTE)/LTE的演进(LTE-Advanced，LTE-A)等无线接入技术标准都是以MIMO+正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术为基础构建起来的。MIMO技术的性能增益来自于多天线系统所能获得的空间自由度，利用空间自由度获得更大的数据传输。因此MIMO技术在标准化发展过程中的一个最重要的演进方向便是维度的扩展。
为了进一步提升MIMO技术，移动通信系统中引入大规模天线技术。对于全数字化的大规模天线有高达128，256，512个天线振子，以及高达128，256，512个收发信机，每个天线振子连接一个收发信机，具有高达128，256，512个数字天线端口。要充分利用高达128，256，512个数字天线端口的空间自由度，终端则需要获取或获知这些高达128，256，512个数字天线端口所对应的空间信道信息。空间信道信息的获取直接取决于用于高达128，256，512个数字天线端口的所使用信道状态信息参考信号(CSI-RS)的数量。大量的CSI-RS将会带来显著的时频资源开销。
大量的CSI-RS所带来的时频资源开销是全数字化大规模天线所面临的技术问题。因此，需要设计一种减少CSI-RS参考信号数量的信道状态信息反馈方法。
目前对于全数字化的大规模天线而言，基于CSI-RS的信道状态信息反馈方法，通常有两种方法，一种是基于天线单元的CSI-RS的信道状态信息反馈方法，称之为非波束赋形(no-beamformed)CSI-RS，另外一种则是基于空间波束分布的赋形的CSI-RS的信道状态信息反馈方法，称之为波束赋形(beamformed)CSI-RS。
但是上述的两种方法均在一定的不足之处。对于no-beamformed CSI-RS的信道状态信息反馈方法，其配置的天线端口的天线单元的增益较小，对于定向天线而言，通常有5-8dBi左右。这使得终端接收到的每个天线端口的CSI-RS信号的功率较小，在小区覆盖范围内用户存在接收功率低，或者接收不到CSI-RS信号的情况，通常称之为CSI-RS信号覆盖不足。这种no-beamformed CSI-RS信号覆盖不足，其主要体现在覆盖距离上。因此，通过CSI-RS信号所估计的信道状态信息不准确，从而影响系统性能。
对于beamformed CSI-RS的信道状态信息反馈方法，其配置的多个增益较高的beamformed波束，称之为N个beamformed波束。这N个beamformed波束由于具有赋形增益，不存在像no-beamformed CSI-RS信号在覆盖距离上的覆盖不足。但其会存在覆盖角度范围上的不足。其不足的原因有二：一是N个beamformed波束与角度范围有关，要使beamformed波束覆盖整个角度范围，则需要N变大，N变大则带来显著的时频资源开销。如果N变小，则覆盖角度范围上的不足。二是基站并不知道UE的分布范围，因此，为某个特定范围设定特定的beamformed波束的数量N，也会导致特定范围外的UE无法使用beamformed波束所带来的性能提升，从而影响系统性能。
发明内容
本发明要解决的技术问题是提供一种信道状态信息的反馈方法、基站及终端。
为了解决上述技术问题，本发明实施例提供一种信道状态信息的反馈方法，包括：
将多个天线端口划分为多个天线端口组；
为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集， 为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
在各天线端口上向终端发送所述预编码参考信号；
接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
其中，所述将多个天线端口划分为多个天线端口组的步骤具体为：
基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组。
其中，当基于天线端口的垂直维度进行分组时，所述基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组的步骤具体为：
将每列垂直方向的天线端口中的每M个天线端口分为一组，每列天线端口的分组数相同；
其中，M为每组中所包含的预设天线端口个数。
其中，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
其中，所述在各天线端口上向终端发送所述预编码参考信号的步骤具体为：
在CSI-RS资源为频域资源时，在相同的子帧上在各天线端口上向终端发送所述预编码参考信号；或者
在CSI-RS资源为时域资源时，在不同的子帧上在各天线端口上向终端发送所述预编码参考信号。
其中，所述信道状态信息CSI包括：组内预编码矩阵指示信息、组间预编码矩阵指示信息、秩指示信息和信道质量指示信息。
其中，所述信道状态信息CSI可以采用如下方式得到：
通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
其中，所述通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的实现方式为：
计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值，获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
其中，所述根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的实现方式为：
根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；根据所述信道信息，获取秩指示信息和信道质量指示信息。
本发明实施例提供一种基站，包括：
分组模块，用于将多个天线端口划分为多个天线端口组；
配置模块，用于为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
第一发送模块，用于在各天线端口上向终端发送所述预编码参考信号；
第一接收模块，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
其中，所述分组模块具体用于：
基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组。
其中，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
其中，所述第一发送模块具体用于：
在CSI-RS资源为频域资源时，在相同的子帧上在各天线端口上向终端发送所述预编码参考信号；或者
在CSI-RS资源为时域资源时，在不同的子帧上在各天线端口上向终端发送所述预编码参考信号。
本发明实施例提供一种基站，包括：
处理器；以及通过总线接口与所述处理器相连接的存储器，所述存储器用于存储所述处理器在执行操作时所使用的程序和数据，当处理器调用并执行所述存储器中所存储的程序和数据时，实现如下的功能模块：
分组模块，用于将多个天线端口划分为多个天线端口组；
配置模块，用于为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的 数量与组间天线端口组数相对应；
第一发送模块，用于在各天线端口上向终端发送所述预编码参考信号；
第一接收模块，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
本发明实施例提供一种信道状态信息的反馈方法，包括：
接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
将获取的CSI发送给所述基站。
其中，所述对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI的步骤包括：
对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；
根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
其中，所述对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的步骤具体为：
计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；
获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
其中，所述获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息的步骤包括：
对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
其中，所述根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的步骤包括：
根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
根据所述信道信息，获取秩指示信息和信道质量指示信息。
其中，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
本发明实施例提供一种终端，包括：
第二接收模块，用于接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
获取模块，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
第二发送模块，用于将获取的CSI发送给所述基站。
其中，所述获取模块包括：
第一获取子模块，用于对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
第二获取子模块，用于获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；
第三获取子模块，用于根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
其中，所述第一获取子模块包括：
计算单元，用于计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；
第一获取单元，用于获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
其中，所述第三获取子模块包括：
第二获取单元，用于根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
第三获取单元，用于根据所述信道信息，获取秩指示信息和信道质量指示信息。
本发明实施例提供一种终端，包括：
处理器；以及通过总线接口与所述处理器相连接的存储器，所述存储器用于存储所述处理器在执行操作时所使用的程序和数据，当处理器调用并执行所述存储器中所存储的程序和数据时，实现如下的功能模块：
第二接收模块，用于接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同 的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
获取模块，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
第二发送模块，用于将获取的CSI发送给所述基站。
本发明的有益效果是：
上述方案，通过对基站上的天线端口进行分组；然后对天线端口组内的参考资源的参考信号进行波束赋形，对天线端口组间的参考资源的参考信号不进行波束赋形；采用组间非波束赋形、组内波束赋形的方式进行参考信号的发送，解决了现有技术中因采用单一方式对参考信号进行发送，造成参考信号在覆盖距离或覆盖角度范围上不足的问题；上述配置方式，使得发送的参考资源的参考信号更为合理，保证了参考信号的覆盖距离与覆盖角度范围。
附图说明
图1表示本发明实施例一的所述信道状态信息的反馈方法的流程示意图；
图2表示本发明实施例二的所述信道状态信息的反馈方法的流程示意图；
图3表示天线端口的分组状态示意图；
图4表示本发明实施例三的基站的模块示意图；
图5表示本发明实施例四的基站的结构示意图；
图6表示本发明实施例五的所述信道状态信息的反馈方法的流程示意图；
图7表示本发明实施例六的所述信道状态信息的反馈方法的流程示意图；
图8表示本发明实施例七的终端的模块示意图；
图9表示本发明实施例八的终端的结构示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图及具体 实施例对本发明进行详细描述。
本发明针对现有的信道状态信息的反馈方法中，因参考信号发送不合理，使得终端反馈的信道状态信息不准确，影响系统性能的问题，提供一种信道状态信息的反馈方法、基站及终端，从而保证了参考信号的覆盖距离与覆盖角度范围。
实施例一
如图1所示，本发明实施例的所述信道状态信息的反馈方法，包括：
步骤11，将多个天线端口划分为多个天线端口组；
需要说明的是，基站上设置有多个发送/接收信号的天线端口，将这些天线端口以分组的形式进行管理，即每个分组可以看作是一个大的天线端口，这样便减少了整体天线端口的数量，进而减少了发送给终端的信号数量。
步骤12，为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；
其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应。
需要说明的是，因基站发送的参考资源有多个，所以在进行该多个参考资源的配置时，需要为每个参考资源在每个天线端口组上配置一个参考信号，且组间发送的参考信号不进行波束赋形，即组间采用的是非波束赋形方式进行参考信号的配置；且每个天线端口组内需要分别发送多个参考资源中的一个参考信号，且组内发送的参考信号需要进行波束赋形，即组内采用的是波束赋形方式进行参考信号的配置，根据组间非波束赋形配置以及组内波束赋形配置进行参考信号的发送，以尽可能保证天线端口发送的参考信号具有较好的覆盖角度范围与覆盖距离。
步骤13，在各天线端口上向终端发送所述预编码参考信号；
此步骤中，在进行参考资源的发送时，只需要按照上述步骤12中的配置进行参考资源的发送即可。需要说明的是，因一个参考信号需要在天线端口组上的多个天线端口上发送，因此，每个天线端口组中一个天线端口发送的 是一个参考信号的一个预编码参考信号。但终端在接收时，是以参考信号的形式进行接收，即终端接收的是每个天线端口组发送过来的参考信号。
步骤14，接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
需要说明的是，该信道状态信息的反馈方法应用于基站侧。
本发明中，所说的参考资源为CSI-RS资源，所述参考信号为CSI-RS信号。
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
需要说明的是，因基站在进行发送时，每个天线端口组均会有CSI-RS信号的发送，在进行配置时，基站会配置每个天线端口组上发送一个CSI-RS资源的一个CSI-RS信号；且还需要说明的是，基站会发送多个CSI-RS资源给终端，因此在进行该多个CSI-RS资源发送时，会配置每个天线端口组上对应发送一个CSI-RS资源的一个CSI-RS信号，假如有Q个CSI-RS资源需要发送，则每个天线端口组上会发送Q个CSI-RS信号，且同一天线端口组上的CSI-RS信号具有不同的赋形波束指向。针对上述配置，使得每个天线端口组内针对同一个CSI-RS资源配置的赋形波束相同，针对不同的CSI-RS资源配置的赋形波束不相同。
因本发明中所述CSI-RS资源可以采用频域资源进行区分，也可以采用时域资源进行区分，应当说明的是，当多个CSI-RS资源为频域资源时，基站可以按照上述配置在在相同的子帧上在各天线端口上向终端发送参考信号的预编码参考信号；当多个CSI-RS资源为时域资源时，基站需按照上述配置在不同的子帧上在各天线端口上向终端发送参考信号的预编码参考信号。
还需要说明的是，通常终端在接收到基站在多个天线端口组上发送的多个CSI-RS资源的CSI-RS信号后，需要根据接收到的多个CSI-RS资源的 CSI-RS信号反馈最优的一个CSI-RS资源所对应的CSI，在本发明中，所述CSI通常包括但不限于是：组内预编码矩阵指示信息、组间预编码矩阵指示信息、秩指示(RI)信息和信道质量指示(CQI)信息。
这里需要说明的是，CSI可以采用如下方式得到：
通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
需要说明的是，终端侧通过上述方式获取需要反馈给基站的CSI。
可选地，上述的通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的具体实现方式为：
计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
上述的获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息的具体实现方式为：
对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
上述的根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的具体实现方式为：
根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；根据所述信道信息，获取秩指示信息和信道质量指示信息。
需要说明的是，基站在接收到终端反馈的CSI后，首先根据CSI中的组内预编码矩阵指示信息、组间预编码矩阵指示信息计算三维预编码矩阵，然后根据三维预编码矩阵、CSI中的秩指示信息和信道质量指示信息进行链路自适应计算。
本实施例中，通过对基站上的天线端口进行分组；然后对天线端口组内 的参考资源的参考信号进行波束赋形，对天线端口组间的参考资源的参考信号不进行波束赋形；采用组间非波束赋形、组内波束赋形的方式进行参考信号的发送，解决了现有技术中因采用单一方式对参考信号进行发送，造成参考信号在覆盖距离或覆盖角度范围上不足的问题；上述配置方式，使得发送的参考资源的参考信号更为合理，保证了参考信号的覆盖距离与覆盖角度范围；同时通过多个天线端口组合发送一个参考信号，减少了参考信号的发送数量，节省了信道资源，提高了系统效率。
实施例二
如图2所示，本发明实施例的所述信道状态信息的反馈方法，包括：
步骤21，基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组；
需要说明的是，基站中的天线端口通常分为垂直方向的天线端口和水平方向的天线端口，本实施例中，在进行天线端口的划分时，为了便于对分组后的天线端口进行管理与配置，通常只在一个方向上进行天线端口的分组。
步骤22，为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；
其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
步骤23，在各天线端口上向终端发送所述预编码参考信号；
步骤24，接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
需要说明的是，当基于天线端口的垂直维度进行分组时，步骤21在具体实现时可以包括：
步骤211，将每列垂直方向的天线端口中的每M个天线端口分为一组，每列天线端口的分组数相同；
其中，M为每组中所包含的预设天线端口个数。
在实际应用中，为了使得天线端口发送的信号在垂直方向具有良好的可调性，通常在水平方向上不进行分组的划分，而在垂直方向上进行分组的划 分，在保证了天线端口发送的信号的覆盖角度范围与覆盖距离的同时，减少了信号的发送数量，节省了信道资源。
以上实施例，在实际应用中的具体实现过程为：
在配置时：
S11、将大规模天线N个天线端口，，分为P组，保持水平方向个天线端口不变，将每列垂直方向个天线端口每M个天线端口分为一组，每列共分为Z组，形成P组天线端口，其中，该P组天线端口由水平方向个天线端口和垂直方向个天线端口组成，每组天线端口内有M个天线端口。其中，为垂直方向天线端口数，为水平方向天线端口数。
S12、配置Q个CSI-RS资源，每个CSI-RS资源有P个CSI-RS信号；
需要说明的是，Q个CSI-RS资可以是频域资源，也可以是时域资源。
S13、为P组中的每一组配置一个CSI-RS资源的一个CSI-RS信号，且为P组中每一个组配置相同的Q个CSI-RS资源。
S14、在同一组内Q个CSI-RS资源的Q个CSI-RS信号对应于指向覆盖角度范围内的Q个不同方向的赋形波束，Q个不同方向的赋形波束由组内M个天线端口通过组内的预编码矩阵指示信息(PMI)形成。
S15、基站配置M*Q维组内码本集(记为)，即该中包含Q个Mx1维的组内预编码矩阵(记为)，所对应的PMI为组内预编码矩阵指示信息(记为)。
S16、基站配置P*NFFT维组间码本集(记为)，即该中包含NFFT个维的组间预编码矩阵(记为)，所对应的PMI为组内预编码矩阵指示信息(记为)，通常NFFT的取值为32。
在发送时：
基站根据CSI-RS资源类型，将Q个CSI-RS资源发送给终端，每个CSI-RS资源包含在P个分组上发送的CSI-RS信号，如果Q个CSI-RS资源是以频域资源区分的，则在相同子帧上发送；如果Q个CSI-RS资源是以时域资源区分的，则在不同的子帧上发送。
如图3所示，以基站共有64(8×8)个天线端口为例，即垂直方向每列上有8个天线端口，水平方向每行上有8个天线端口，将垂直方向每列上的天线端口每4个天线端口分为一组，则垂直方向每列上共有分出两组，这样 就将64个天线端口分为了16组，如图3中的P1、P2......P16。
其中，每组承载多个CSI-RS资源中的CSI-RS信号，且每组只承载每个CSI-RS资源的一个CSI-RS信号；
例如，现在需要发送两个时域CSI-RS资源，将每个CSI-RS资源分成16个CSI-RS信号，在P1组、P2组......P16组上分别承载每个CSI-RS资源的一个CSI-RS信号，每个CSI-RS资源的一个CSI-RS信号便在相应的承载该信号的分组上发出。
例如：P1组承载第一个CSI-RS资源的CSI-RS信号1和第二个CSI-RS资源的CSI-RS信号1，P2组承载第二个CSI-RS资源的CSI-RS信号2和第二个CSI-RS资源的CSI-RS信号2，依此类推。
第一个CSI-RS资源划分的CSI-RS信号分别为S101，S102......S116；
第二个CSI-RS资源划分的CSI-RS信号分别为S201，S202......S216；
则在发送时，将第一个CSI-RS资源和第二个CSI-RS资源在不同的子帧上发出，且S101和S201由P1组发出，S102和S202由P2组发出，依此类推。
本发明上述实施例，通过对基站上的天线端口进行分组；对天线端口组内的CSI-RS资源的CSI-RS信号进行波束赋形，对天线端口组间的CSI-RS资源的CSI-RS信号不进行波束赋形；采用组间非波束赋形、组内波束赋形的方式进行CSI-RS信号的发送，解决了现有技术中因采用单一方式对CSI-RS信号进行发送，造成CSI-RS信号在覆盖距离或覆盖角度范围上不足的问题；上述配置方式，使得发送的CSI-RS资源的CSI-RS信号更为合理，保证了CSI-RS信号的覆盖距离与覆盖角度范围；同时通过多个天线端口组合发送一个CSI-RS信号，减少了CSI-RS信号的发送数量，节省了信道资源，提高了系统效率。
实施例三
如图4所示，本发明实施例提供一种基站40，包括：
分组模块41，用于将多个天线端口划分为多个天线端口组；
配置模块42，用于为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参 考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；
其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
第一发送模块43，用于在各天线端口上向终端发送所述预编码参考信号；
第一接收模块44，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
具体地，所述分组模块41用于：
基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组。
可选地，当基于天线端口的垂直维度进行分组时，所述分组模块51在具体实现可以为：将每列垂直方向的天线端口中的每M个天线端口分为一组，每列天线端口的分组数相同；
其中，M为每组中所包含的预设天线端口个数。
可选地，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
本发明中，在CSI-RS资源为频域资源时，所述第一发送模块43具体用于：在相同的子帧上在各天线端口上向终端发送所述预编码参考信号；或者
在CSI-RS资源为时域资源时，所述第一发送模块43具体用于：在不同的子帧上在各天线端口上向终端发送所述预编码参考信号。
还需要说明的是，该CSI可以采用如下方式得到：
通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基 站的组内预编码矩阵指示信息；获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
具体地，所述通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的具体实现方式为：
计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
具体地，所述获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息的具体实现方式为：
对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
具体地，所述根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的具体实现方式为：
根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；根据所述信道信息，获取秩指示信息和信道质量指示信息。
需要说明的是，该基站的实施例是与上述反馈方法实施例一一对应的基站，上述反馈方法实施例中所有实现方式均适用于该基站的实施例中，也能达到相同的技术效果。
实施例四
如图5所示，本实施例提供一种基站，包括：
处理器51；以及通过总线接口52与所述处理器51相连接的存储器53，所述存储器53用于存储所述处理器51在执行操作时所使用的程序和数据，当处理器51调用并执行所述存储器53中所存储的程序和数据时，实现如下的功能模块：
分组模块，用于将多个天线端口划分为多个天线端口组；
配置模块，用于为每个天线端口组配置由多个组内预编码矩阵构成的相 同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；
其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
第一发送模块，用于在各天线端口上向终端发送所述预编码参考信号；
第一接收模块，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
该处理器51还用于实现上述基站的其它任意一个模块的功能。
本领域技术人员可以理解，实现上述实施例的全部或者部分步骤可以通过硬件来完成，也可以通过计算机程序来指示相关的硬件来完成，所述计算机程序包括执行上述方法的部分或者全部步骤的指令；且该计算机程序可以存储于一可读存储介质中，存储介质可以是任何形式的存储介质。
实施例五
如图6所示，本发明实施例的信道状态信息的反馈方法，包括：
步骤61，接收基站发送的多个参考资源对应的参考信号；
需要说明的是，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应。
该参考资源通常为基站发送的CSI-RS资源，该参考信号为CSI-RS信号；
其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束 指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
步骤62，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
需要说明的是，该参考资源通常为基站发送的CSI-RS资源，该参考信号为CSI-RS信号，终端根据接收到的CSI-RS资源对应的CSI-RS信号，进行资源的挑选以及信道的测量，获取到需要反馈的CSI。
步骤63，将获取的CSI发送给所述基站。
需要说明的是，本实施例中，该反馈方法应用于终端侧，终端侧接收基站在配置的天线端口组上发送过来的CSI-RS资源的CSI-RS信号，因CSI-RS信号是按天线端口组接收的，所以减少了终端接收CSI-RS信号的个数，降低了终端对该CSI-RS信号的处理时延，提高了反馈效率。
实施例六
如图7所示，本发明实施例的所述信道状态信息的反馈方法，包括：
步骤71，接收基站发送的多个参考资源对应的参考信号；
其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应。
步骤72，对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
步骤72中在进行参考资源对应的参考信号的接收后，需要根据该参考信号获取到最优的赋形波束，因该赋形波束由组内预编码矩阵指示信息生成，所以该步骤72中，可以根据接收的参考资源对应的参考信号得到需要反馈的组内预编码矩阵指示信息。
步骤73，获取组内预编码矩阵指示信息对应的参考资源的各个参考信号 在每个天线端口组上的信道信息；
在得到需要反馈的组内预编码矩阵指示信息后，便可知道该组内预编码矩阵指示信息对应的是哪个参考资源，然后对该参考资源进行信道测量便能得到相应的信道信息。
步骤74，根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
需要说明的是，将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI反馈给基站。
步骤75，将获取的CSI发送给所述基站。
需要说明的是，因基站侧对该参考资源进行的是两级的配置发送，所述终端侧在进行CSI获取时也是分级进行获取的，即先获取到组内预编码矩阵指示信息，由组内预编码矩阵指示信息便确定了需要进行哪个参考资源的反馈，然后再进行该参考资源的信道的测量，生成需要反馈的CSI包含的所有信息。
可选地，所述步骤72在具体实现时，可以包括：
步骤721，计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率(RSRP)的平均值；
当基站发送的为CSI-RS资源，终端在进行接收时，每个天线端口组上的同一CSI-RS资源的CSI-RS信号均有一个RSRP，将同一CSI-RS资源的这些CSI-RS信号的RSRP进行求平均值运算，使得每个CSI-RS资源均对应一个RSRP的平均值(例如根据图3中的发送情况，终端侧在进行RSRP计算时，根据S101，S102......S116的RSRP获取第一个CSI-RS资源的RSRP的平均值，根据S201，S202......S216的RSRP获取第二个CSI-RS资源的RSRP的平均值)。
步骤722，获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
在进行比较后，当某一个CSI-RS资源的RSRP平均值最大时，表明该CSI-RS资源的接收功率最好，则选择为该CSI-RS资源赋形的预编码矩阵指示信息作为需要反馈的组内预编码矩阵指示信息。
可选地，所述步骤73在具体实现时，可以包括：
步骤731，对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
在得到组内预编码矩阵指示信息对应的参考资源的在全部分组上的信道信息后，便需要根据该信道信息得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息，可选地，所述步骤74在具体实现时，可以包括：
步骤741，根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
需要说明的是，在步骤741中主要是为了获取组间预编码矩阵指示信息，将信道信息分别与组间码本集中的每一个预编码矩阵指示信息进行运算，得到运算结果最优的预编码矩阵指示信息，将该最优的预编码矩阵指示信息作为需要反馈的组间预编码矩阵指示信息。
步骤742，根据所述信道信息，获取秩指示信息和信道质量指示信息；
需要说明的是，可以根据现有技术中获取秩指示信息和信道质量指示信息的方式进行本发明中需反馈的秩指示信息和信道质量指示信息的获取，在此不再进行详细的说明。
对应于应用在基站侧的反馈方法，在实际应用中，终端侧的反馈过程具体为：
S21、终端接收P个组的Q个CSI-RS资源的CSI-RS信号，计算每个CSI-RS资源在P个组上所接收的RSRP的平均值，比较Q个RSRP值，选取最大RSRP所对应的PMI为需要反馈的组内预编码矩阵指示信息(记为)。
S22、选取所对应的CSI-RS资源所对应的P个CSI-RS信号的接收信号进行信道测量，得到P个组的天线端口所对应的信道信息(记为)；
其中，NRxAnt为终端的接收天线的数量，C表示维度。
S23、终端根据以及组间码本集()计算需要反馈的组间预编码矩阵指示信息(记为)；同时根据计算RI信息和CQI信息；
S24、将上述步骤中得到的、以及RI信息和CQI信息作为CSI反馈给基站，使得基站侧根据选取所对应的Mx1维的组内预编码矩阵(记为)，根据选取所对应的维的组间预编码矩阵(记为)，并计算三维预编码矩阵； 其中，是矩阵；基站根据计算得到的以及终端反馈的RI信息和CQI信息进行链路自适应参数的计算。
本发明以上实施例，通过两级CSI-RS资源配置，包括：组内赋形CSI-RS资源配置，组间非赋形的CSI-RS信号配置；组间CSI-RS资源配置选取适用于终端的赋形波束指向，通过组间非赋形的CSI-RS信号配置，解决了基于天线端口的no-beamformed CSI-RS方法覆盖距离不足以及基于垂直方向所有天线端口的beamformed CSI-RS方法覆盖角度范围不足的问题，实现了更精确的3D波束传输；同时，减少了CSI-RS信号的发送数量，节省了信道资源，提高了系统效率。
实施例七
如图8所示，本发明实施例提供一种终端80，包括：
第二接收模块81，用于接收基站发送的多个参考资源对应的参考信号；
其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
获取模块82，用于对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
第二发送模块83，用于将获取的CSI发送给所述基站。
需要说明的是，该参考资源为信号状态信息-参考信号CSI-RS资源，该参考信号为CSI-RS信号；其中，
CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束 指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
可选地，所述获取模块82在具体实现时，包括：
第一获取子模块，用于对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
第二获取子模块，用于获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；
第三获取子模块，用于根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
具体地，所述第一获取子模块包括：
计算单元，用于计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；
第一获取单元，用于获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
具体地，所述第二获取子模块具体用于：对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
具体地，所述第三获取子模块包括：
第二获取单元，用于根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
第三获取单元，用于根据所述信道信息，获取秩指示信息和信道质量指示信息。
需要说明的是，该终端的实施例是与上述反馈方法实施例一一对应的终端，上述反馈方法实施例中所有实现方式均适用于该终端的实施例中，也能达到相同的技术效果。
实施例八
如图9所示，本实施例提供一种终端，包括：
处理器91；以及通过总线接口92与所述处理器91相连接的存储器93，所述存储器93用于存储所述处理器91在执行操作时所使用的程序和数据，当处理器91调用并执行所述存储器93中所存储的程序和数据时，实现如下的功能模块：
第二接收模块，用于接收基站发送的多个参考资源对应的参考信号；
其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应。
获取模块，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
第二发送模块，用于将获取的CSI发送给所述基站。
该处理器91还用于实现上述反馈装置的其它任意一个模块的功能。
本领域技术人员可以理解，实现上述实施例的全部或者部分步骤可以通过硬件来完成，也可以通过计算机程序来指示相关的硬件来完成，所述计算机程序包括执行上述方法的部分或者全部步骤的指令；且该计算机程序可以存储于一可读存储介质中，存储介质可以是任何形式的存储介质。
以上所述的是本发明的优选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本发明所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本发明的保护范围内。

Claims (25)

  1. 一种信道状态信息的反馈方法，其特征在于，包括：
    将多个天线端口划分为多个天线端口组；
    为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    在各天线端口上向终端发送所述预编码参考信号；
    接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
  2. 根据权利要求1所述的信道状态信息的反馈方法，其特征在于，所述将多个天线端口划分为多个天线端口组的步骤具体为：
    基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组。
  3. 根据权利要求2所述的信道状态信息的反馈方法，其特征在于，当基于天线端口的垂直维度进行分组时，所述基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组的步骤具体为：
    将每列垂直方向的天线端口中的每M个天线端口分为一组，每列天线端口的分组数相同；
    其中，M为每组中所包含的预设天线端口个数。
  4. 根据权利要求1所述的信道状态信息的反馈方法，其特征在于，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
    其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
    同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
  5. 根据权利要求4所述的信道状态信息的反馈方法，其特征在于，所述在各天线端口上向终端发送所述预编码参考信号的步骤具体为：
    在CSI-RS资源为频域资源时，在相同的子帧上在各天线端口上向终端发送所述预编码参考信号；或者
    在CSI-RS资源为时域资源时，在不同的子帧上在各天线端口上向终端发送所述预编码参考信号。
  6. 根据权利要求1所述的信道状态信息的反馈方法，其特征在于，所述信道状态信息CSI包括：组内预编码矩阵指示信息、组间预编码矩阵指示信息、秩指示信息和信道质量指示信息。
  7. 根据权利要求6所述的信道状态信息的反馈方法，其特征在于，所述信道状态信息CSI可以采用如下方式得到：
    通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
  8. 根据权利要求7所述的信道状态信息的反馈方法，其特征在于，所述通过终端对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的实现方式为：
    计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值，获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
  9. 根据权利要求7所述的信道状态信息的反馈方法，其特征在于，所述 根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的实现方式为：
    根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；根据所述信道信息，获取秩指示信息和信道质量指示信息。
  10. 一种基站，其特征在于，包括：
    分组模块，用于将多个天线端口划分为多个天线端口组；
    配置模块，用于为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    第一发送模块，用于在各天线端口上向终端发送所述预编码参考信号；
    第一接收模块，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
  11. 根据权利要求10所述的基站，其特征在于，所述分组模块具体用于：
    基于天线端口的一个维度，采用同一分组方式分别对多个天线端口中的各行或各列天线端口进行分组。
  12. 根据权利要求10所述的基站，其特征在于，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
    其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
    同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
  13. 根据权利要求12所述的基站，其特征在于，所述第一发送模块具体用于：
    在CSI-RS资源为频域资源时，在相同的子帧上在各天线端口上向终端发送所述预编码参考信号；或者
    在CSI-RS资源为时域资源时，在不同的子帧上在各天线端口上向终端发送所述预编码参考信号。
  14. 一种基站，其特征在于，包括：
    处理器；以及通过总线接口与所述处理器相连接的存储器，所述存储器用于存储所述处理器在执行操作时所使用的程序和数据，当处理器调用并执行所述存储器中所存储的程序和数据时，实现如下的功能模块：
    分组模块，用于将多个天线端口划分为多个天线端口组；
    配置模块，用于为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    第一发送模块，用于在各天线端口上向终端发送所述预编码参考信号；
    第一接收模块，用于接收终端基于对参考信号的测量而反馈的信道状态信息CSI。
  15. 一种信道状态信息的反馈方法，其特征在于，包括：
    接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
    将获取的CSI发送给所述基站。
  16. 根据权利要求15所述的信道状态信息的反馈方法，其特征在于，所述对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI的步骤包括：
    对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
    获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；
    根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
    将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
  17. 根据权利要求16所述的信道状态信息的反馈方法，其特征在于，所述对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息的步骤具体为：
    计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；
    获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
  18. 根据权利要求16所述的信道状态信息的反馈方法，其特征在于，所述获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息的步骤包括：
    对所述组内预编码矩阵指示信息对应的参考资源在全部天线端口组上的参考信号进行信道测量，得到每个天线端口组所对应的信道信息。
  19. 根据权利要求16所述的信道状态信息的反馈方法，其特征在于，所述根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息的步骤包括：
    根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
    根据所述信道信息，获取秩指示信息和信道质量指示信息。
  20. 根据权利要求15所述的信道状态信息的反馈方法，其特征在于，所述参考资源为信号状态信息-参考信号CSI-RS资源，所述参考信号为CSI-RS信号；
    其中，CSI-RS资源的数量与所述组内码本集中的组内预编码矩阵的数量相同，各CSI-RS资源对应的CSI-RS信号的数量与组间天线端口组数相同；
    同一个CSI-RS资源对应的所有CSI-RS信号在各天线端口组内的组内预编码矩阵相同，所形成的赋形波束指向相同，同一个天线端口组内的不同CSI-RS资源对应的CSI-RS信号的组内预编码矩阵不同，所形成的赋形波束指向不同，并且不同的组内预编码矩阵所形成的赋形波束指向均匀覆盖垂直方向的整个覆盖角度范围。
  21. 一种终端，其特征在于，包括：
    第二接收模块，用于接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    获取模块，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
    第二发送模块，用于将获取的CSI发送给所述基站。
  22. 根据权利要求21所述的终端，其特征在于，所述获取模块包括：
    第一获取子模块，用于对各个参考资源的参考信号分别进行测量，获取需要反馈给基站的组内预编码矩阵指示信息；
    第二获取子模块，用于获取组内预编码矩阵指示信息对应的参考资源的各个参考信号在每个天线端口组上的信道信息；
    第三获取子模块，用于根据所述信道信息，得到反馈给基站的组间预编码矩阵指示信息、秩指示信息和信道质量指示信息；
    将所述组内预编码矩阵指示信息以及组间预编码矩阵指示信息、秩指示信息和信道质量指示信息作为CSI。
  23. 根据权利要求22所述的终端，其特征在于，所述第一获取子模块包括：
    计算单元，用于计算每个参考资源的参考信号在全部天线端口组上所接收的参考信号接收功率RSRP的平均值；
    第一获取单元，用于获取平均值最大的RSRP对应的预编码矩阵指示信息，将所述预编码矩阵指示信息作为组内预编码矩阵指示信息。
  24. 根据权利要求22所述的终端，其特征在于，所述第三获取子模块包括：
    第二获取单元，用于根据所述信道信息以及预先配置的组间码本集，获取组间预编码矩阵指示信息；
    第三获取单元，用于根据所述信道信息，获取秩指示信息和信道质量指示信息。
  25. 一种终端，其特征在于，包括：
    处理器；以及通过总线接口与所述处理器相连接的存储器，所述存储器用于存储所述处理器在执行操作时所使用的程序和数据，当处理器调用并执行所述存储器中所存储的程序和数据时，实现如下的功能模块：
    第二接收模块，用于接收基站发送的多个参考资源对应的参考信号，其中，所述参考信号是基站将天线端口划分为多个天线端口组并为各天线端口组配置的，且基站为每个天线端口组配置由多个组内预编码矩阵构成的相同的组内码本集，为每个天线端口组分配多个相同参考资源对应的不同参考信号，并为每个天线端口组内的每个天线端口配置经过所述组内预编码矩阵进行预编码而得到的预编码参考信号；其中，所述参考资源的数量与所述组内码本集中的组内预编码矩阵的数量相对应，各参考资源对应的参考信号的数量与组间天线端口组数相对应；
    获取模块，对所述参考资源对应的参考信号进行测量，获取信道状态信息CSI；
    第二发送模块，用于将获取的CSI发送给所述基站。
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US10193609B2 (en) 2019-01-29
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