WO2018153045A1 - 一种信道状态信息反馈方法、装置和系统、存储介质 - Google Patents

一种信道状态信息反馈方法、装置和系统、存储介质 Download PDF

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Publication number
WO2018153045A1
WO2018153045A1 PCT/CN2017/099357 CN2017099357W WO2018153045A1 WO 2018153045 A1 WO2018153045 A1 WO 2018153045A1 CN 2017099357 W CN2017099357 W CN 2017099357W WO 2018153045 A1 WO2018153045 A1 WO 2018153045A1
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Prior art keywords
user terminal
state information
channel state
target user
cqi
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PCT/CN2017/099357
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English (en)
French (fr)
Inventor
佘锋
梁亚超
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深圳市中兴微电子技术有限公司
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Publication of WO2018153045A1 publication Critical patent/WO2018153045A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to a radio access technology, and in particular, to a channel state information feedback method, apparatus and system, and a computer storage medium.
  • Non-orthogonal access has become an important wireless access in the new air interface design of the Long Term Evolution Advanced (LTE-A) system and the 5th generation mobile communication technology (5G, 5th-Generation).
  • LTE-A Long Term Evolution Advanced
  • 5G, 5th-Generation 5th generation mobile communication technology
  • R14 Rel-14
  • 3GPP 3rd Generation Partnership Project
  • the Multi-User Superposition Transmission (MUST) scheme has been supported.
  • the base station side can schedule two user terminals (UE, User Equipment) on the same time-frequency domain resource, that is, the data of the two scheduled UEs will be at the same time.
  • the frequency resources are superimposed and transmitted together.
  • the remote UE is transparent to the near-end UE, that is, the remote UE does not know any information of the near-end UE.
  • the remote UE weakens the interference of the near-end UE by large-scale fading, thereby smoothly demodulating; the near-end UE performs interference cancellation based on the transmission information of the remote UE indicated by the base station (eNB).
  • UE1 and UE2 are referred to as a near-end UE and a far-end UE, respectively.
  • the base station configures the transmission information of the remote UE, that is, the UE2, for the near-end UE, that is, the UE1, and the transmission information is used to help the near-end UE correctly receive its own data.
  • the base station generally does not need to configure the information of the near-end UE, that is, the near-end UE is transparent to the remote UE.
  • Manner 1 UE1 (near-end UE) and UE2 (remote UE) are superimposed and transmitted based on the same precoding scheme;
  • Mode 2 UE1 (near-end UE) and UE2 (remote UE) are superimposed and transmitted based on a diversity scheme (same pre-coding);
  • Mode 3 UE1 (near-end UE) and UE2 (remote UE) are superimposed and transmitted based on different precoding schemes.
  • the MUST transmission also supports the combination of different modulation modes of the far-end UE and the near-end UE.
  • the remote UE adopts Quadrature Phase Shift Keyin (QPSK) modulation mode
  • the near-end UE can select QPSK.
  • the combinations of modulation modes that can be supported include the following: (QPSK, QPSK), (16QAM, QPSK), (64QAM, QPSK).
  • the parameters that the eNB needs to configure include the transmission mode (mode 1, mode 2, mode 3) and modulation mode combination ((QPSK, QPSK), (in order to implement the MUST transmission scheme). 16QAM, QPSK), (64QAM, QPSK)), And a power ratio between the near-end UE and the far-end UE.
  • the eNB In order to obtain good MUST transmission performance, the eNB must properly configure the above parameters. To achieve reasonable configuration of parameters, the eNB needs to be based on accurate channel state information, which requires the near-end UE to feed back more accurate and comprehensive channel state information.
  • the eNB must understand the channel change in time, and flexibly configure the MUST transmission parameters and the paired users based on the channel change information to optimize the system performance.
  • the MUST parameter configured by the eNB may not match the channel of the UE, which will inevitably lead to system performance degradation. Therefore, in the scheduling and transmission of MUST, the accuracy and comprehensiveness of the channel state information fed back by the near-end UE is the key to guarantee the MUST scheduling and transmission performance optimization.
  • the protocol only supports single-user multiple-input multiple-output (MIMO) feedback.
  • MIMO multiple-input multiple-output
  • the Channel State Information (CSI) fed back by the UE can only provide a Precoding Matrix Indicator (PMI) and a Channel Quality Indicator (CQI) of a single UE.
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • rank indication RI, rank indication
  • the channel state information of a single user is not comprehensive, and the information is not enough to provide relatively accurate channel state information for the eNB, which causes the eNB to perform accurate MUST scheduling based on the channel state information.
  • the embodiment of the present invention provides a channel state information feedback method, device, and system, and a computer storage medium, which solves the channel state that is not suitable for the feedback of the user terminal caused by the feedback mode existing in the prior art.
  • the information is inaccurate and the base station cannot accurately implement the MUST scheduling problem.
  • An embodiment of the present invention provides a channel state information feedback method, where the method includes:
  • the base station sends pre-activation signaling to the target user terminal to notify the target user terminal to prepare for activation of the MUST;
  • the target user terminal is the base station that schedules the user terminal near the base station side of the two user terminals on the same time-frequency domain resource. ;
  • the channel state information includes: a CQI
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI.
  • the determining, according to the channel state information, whether to activate the multi-user overlay transmission includes:
  • the throughput rate is higher than the throughput rate when the multi-user overlay transmission is not activated, and it is determined that the multi-user overlay transmission is activated.
  • the selecting a transmission mode of the multi-user overlay transmission includes:
  • An embodiment of the present invention provides a channel state information feedback method, where the method includes:
  • the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST;
  • the target user terminal After receiving the pre-activation information and the scheduling indication signaling, the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back to the base station;
  • the channel state information includes: a CQI
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI;
  • the target user terminal selects a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and selects a power ratio to be used according to the candidate power ratio;
  • the at least one CQI is obtained by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the scheduling indication information further includes: a physical uplink control channel physical uplink control channel (PUCCH, Physical Uplink Control Channel) or a physical uplink shared channel (PUSCH) (Physical Uplink Shared Channel);
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink shared channel
  • the channel state information further includes: a PMI;
  • the target user terminal feeds back channel state information to the base station, including:
  • the embodiment of the present invention provides a channel state information feedback device, where the device includes: a first sending module, a second sending module, and a determining module;
  • the first sending module is configured to send pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST; and the target user terminal is to schedule two user terminals on the same time-frequency domain resource for the base station. a user terminal that is close to the base station side;
  • the second sending module is configured to send scheduling indication signaling to the target user terminal, to indicate that the target user terminal transmits channel state information; after the pre-activation information and the scheduling indication signaling are received, Determining, by the target user terminal, channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeding back to the base station;
  • the determining module is configured to receive the channel state information that is fed back by the target user terminal, determine whether to activate the MUST according to the channel state information, and determine to select the MUST according to the channel state information when the MUST is activated. MUST transmission method.
  • the channel state information includes: a CQI
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI.
  • the determining module is specifically configured to: according to the channel state of the feedback Determining the throughput rate, determining whether the throughput rate of the activation of the multi-user overlay transmission is higher than a throughput rate when the multi-user overlay transmission is not activated, and the throughput rate of activating the multi-user overlay transmission is higher than inactive
  • the multi-user overlay transmission rate is determined to activate the multi-user overlay transmission.
  • the determining module is specifically configured to determine performance of the target user terminal and the remote user terminal when different transmission modes are determined according to the channel state information, and select the target user terminal and the The transmission mode when the performance of the remote user terminal is optimal.
  • the first sending module, the second sending module, and the determining module may use a central processing unit (CPU), a digital signal processor (DSP), or a programmable logic array (FPGA) when performing processing. , Field-Programmable Gate Array) implementation.
  • CPU central processing unit
  • DSP digital signal processor
  • FPGA programmable logic array
  • An embodiment of the present invention provides a channel state information feedback system, where the system includes: a base station and a target user terminal;
  • the base station is configured to send pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST, and the target user terminal is the base station scheduling the two user terminals in the same time-frequency domain resource.
  • a user terminal that is in the vicinity; sending, to the target user terminal, scheduling indication signaling, to indicate that the target user terminal transmits channel state information; and receiving the channel state information that is fed back by the target user terminal, according to the Determining whether to activate the MUST, determining that the MUST transmission mode is selected according to the channel state information when the MUST is activated;
  • target user terminal is configured to: after receiving the pre-activation information and the scheduling indication signaling, determine channel state information according to the pre-activation signaling and the scheduling indication signaling, and feed back to the base station.
  • the channel state information includes: a CQI
  • the pre-activation signaling or the scheduling indication signaling includes: the transmission mode of the MUST, a candidate power ratio, a combination of modulation modes, a period in which the CQI is transmitted, a number of the CQIs, and a number of PMIs;
  • the target user terminal is specifically configured to: select a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and select a power ratio to be used according to the power ratio of the candidate; After the channel estimation value and the noise power, the at least one CQI is calculated by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the scheduling indication information further includes: a resource location of the PUCCH or the PUSCH;
  • the channel state information further includes: a PMI;
  • the target user terminal is configured to: extract at least one CQI as the channel state information according to the number of CQIs; or extract at least one CQI according to the number of CQIs, and extract at least one according to the number of the PMIs. PMI, using the extracted CQI and PMI as the channel state information;
  • a computer storage medium provided by an embodiment of the present invention, wherein a computer program for executing the channel state information feedback method is stored.
  • the channel state information feedback method includes: the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST; and the target user terminal is the base station in the same time-frequency domain. Dispatching a user terminal that is close to the base station side of the two user terminals; the base station sends scheduling indication signaling to the target user terminal, to indicate that the target user terminal transmits channel state information; the pre-activation information and After the scheduling indication signaling is received, the target user terminal according to the pre-activation signaling and the scheduling finger Demonstrating signaling to determine channel state information and feeding back to the base station; the base station receiving the channel state information fed back by the target user terminal, determining, according to the channel state information, whether to activate the MUST, determining to activate the multi-user When superimposing transmission, the transmission mode of the MUST is selected according to the channel state information.
  • the embodiment of the present invention overcomes the problem that the feedback mode existing in the existing LTE-A is not suitable for the MUST transmission, and thus the channel quality information fed back by the UE is not accurate enough, the base station cannot accurately implement the MUST scheduling, and the system performance is degraded; Improve the comprehensiveness of the channel state information fed back by the target UE, and provide more accurate channel state information for the base station. Based on the more accurate channel state information, the base station can more accurately implement the pairing between the far-end user terminal and the target user terminal in the MUST transmission, and perform the comparison and optimization of the MUST transmission mode selection and the transmission parameter configuration, thereby obtaining a better system. performance.
  • 1 is a schematic structural view of a MUST transmission system
  • FIG. 2 is a schematic flowchart of a channel state information feedback method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a channel state information feedback apparatus according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart diagram of another channel state information feedback method according to an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of a channel state information feedback system according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic flowchart diagram of still another channel state information feedback method according to an embodiment of the present invention.
  • the base station sends pre-activation signaling to the target user terminal to notify the target user terminal to prepare for activation of the MUST; the base station sends scheduling indication signaling to the target user terminal, where Instructing the target user terminal to transmit channel state information; After the pre-activation information and the scheduling indication signaling are received, the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back to the base station; The channel state information fed back by the target user terminal determines whether to activate the MUST according to the channel state information, and determines to select the transmission mode of the MUST according to the channel state information when the multi-user superimposed transmission is activated.
  • FIG. 2 is a schematic flowchart of a channel state information feedback method according to an embodiment of the present invention; as shown in FIG. 2, the method includes:
  • Step 101 The eNB sends the MUST pre-activation signaling to the target UE, to notify the target user terminal to prepare to activate the MUST;
  • the target user terminal is a base station that schedules, on the same time-frequency domain resource, a user terminal that is close to the base station side of the two user terminals;
  • the base station schedules user terminals far away from the base station in the two user terminals on the same time-frequency domain resource, which is referred to herein as a remote user terminal.
  • the base station is configured to schedule a target UE and a remote UE; and based on the channel state information acquired by the base station, the base station may perform selection of a MUST transmission mode and pairing of a MUST user.
  • the pre-activation signaling is configured to indicate that the UE is ready to activate the MUST operation; here, the base station sends the MUST pre-activation signaling to the target UE, and notifies the target UE to prepare to activate the MUST operation.
  • the pre-activation signaling may use Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • the cell (IE) corresponding to the pre-activation signaling may be placed under PhysicalConfigDedicated and PhysicalConfigDedicatedSCell-r10 to indicate that the user terminal pre-activates the MUST.
  • Step 102 The base station sends a downlink indication information (DCI) to the target user terminal, to indicate that the target user terminal transmits channel state information.
  • DCI downlink indication information
  • the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back to the base station.
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling may include: a period of transmitting CQI, a quantity of CQI, a quantity of PMI, a transmission mode of CQI, a candidate power ratio, and a combination of modulation modes;
  • the power ratio of the candidate is a power ratio of the remote user terminal to the target user terminal.
  • the transmission mode of the CQI includes: mode 1 (case 1), mode 2 (case 2), and mode 3 (case 3);
  • Case1 the target UE and the remote UE are superimposed and transmitted based on the same precoding scheme
  • Case2 the target UE and the remote UE are transmitted based on the same precoding superposition
  • Case 3 The target UE and the remote UE are superimposed and transmitted based on different precoding schemes.
  • the remote UE and the target UE are combined in different modulation modes.
  • the modulation mode combination may include: (QPSK, QPSK), (16QAM, QPSK), (64QAM, QPSK).
  • the pre-activation signaling may be implemented by RRC signaling, and the manner of configuring the pre-activation signaling is as follows:
  • 0, 1, and 2 are modulation mode combinations, respectively (QPSK, QPSK) (16QAM, QPSK) (64QAM, QPSK)
  • the foregoing information may be included in the pre-activation signaling, and may also be included in the scheduling indication signaling, which is not limited.
  • the scheduling indication signaling is used as a downlink control instruction, and is used to send an indication that the multiple CQIs are fed back to the target UE.
  • the uplink feedback types of PMI/RI/CQI are divided into the following two types:
  • Periodic feedback mainly carrying feedback on the PUCCH
  • Aperiodic feedback feedback carried on the PUSCH.
  • the scheduling indication signaling further includes: a resource location (time-frequency resource) of the PUCCH or the PUSCH;
  • the base station notifies the target UE to feed back a plurality of CQIs and PMIs at resource locations of the designated PUCCH or PUSCH by using scheduling indication signaling.
  • the resource location of the PUCCH is configured as shown in the following formula (1):
  • n PUCCH n CCE +N (1) (1)
  • n PUCCH is the resource location of the CQI on the PUCCH
  • n CCE is the control channel element (CCE, Control Channel Element) number of the physical downlink control channel (PDCCH, Physical Downlink Control Channel) of the scheduled remote UE, N ( 1) high-level configuration parameters.
  • the interfering UE is superimposed on the same time-frequency resource.
  • Data transmission of two UEs is based on different power ratios, two UEs
  • the power ratio can be selected by reference to the provisions of the current protocol (LTE-A or 5G protocol).
  • the precoding matrices of the two UEs may also be different.
  • the precoding matrix may be determined based on a prescribed codebook (LTE-A or 5G codebook) and a transmission mode.
  • the determining, by the target user terminal, the channel state information according to the pre-activation signaling and the scheduling indication signaling including:
  • the target UE selects a currently used power ratio according to the received power ratio of the candidate
  • the target UE measures to obtain a channel estimation value and a noise power of the target UE
  • Obtaining at least one CQI is calculated according to a precoding matrix of the target UE, a precoding matrix of the far end UE, the currently used power ratio, a channel estimation value of the target UE, and a noise power.
  • the channel state information may further include: a PMI, an RI, and/or a power ratio recommendation value, etc., which are calculated and obtained by the target UE according to the received information.
  • a PMI a PMI
  • an RI a power ratio recommendation value
  • the channel state information may further include: a PMI, an RI, and/or a power ratio recommendation value, etc., which are calculated and obtained by the target UE according to the received information.
  • Determining, by the target user terminal, the PMI according to the pre-activation signaling and the scheduling indication signaling including:
  • the target UE selects the PMI based on a criterion of maximum capacity or signal to interference plus noise ratio (SINR).
  • SINR signal to interference plus noise ratio
  • Step 103 The base station receives the channel state information fed back by the target user terminal, determines whether to activate the MUST according to the channel state information, determines to activate the MUST, and selects the MUST according to the channel state information. The way of transmission.
  • Determining whether to activate the MUST according to the channel state information includes:
  • Determining a system throughput rate based on the determined channel state information determining to activate the multi-user overlay Whether the throughput rate of the transmission is higher than the throughput rate when the multi-user overlay transmission is not activated, and the throughput rate of the activation of the multi-user overlay transmission is higher than the throughput rate when the multi-user overlay transmission is not activated. It is determined that the multi-user overlay transmission is activated.
  • the transmission mode when each UE performs optimally is determined as the transmission mode of the MUST.
  • the selecting the transmission mode of the MUST according to the channel state information includes:
  • the target UE performs calculation and selection of multiple CQIs and PMIs based on the MUST transmission mode, parameter configuration information, and the assumption of the far-end UE pairing sent by the eNB.
  • methods for calculating CQI and PMI include:
  • the received RRC signaling configuration parameter is (case3, QPSK+QPSK, 0.75, 2), and it can be determined that the remote UE and the target UE adopt the case 3 transmission mode, that is, the remote UE and the target UE adopt different precoding;
  • the modulation mode of the remote UE and the target UE is QPSK;
  • the power ratio between the remote UE and the target UE is (0.75:1-0.75); the two best CQIs are fed back;
  • CQI n is the nth CQI
  • P 1 and P 2 are precoding matrices of the far end UE and the near end UE
  • s 1 and s 2 respectively The symbol power of the remote UE and the target UE
  • H 1 is the channel estimation value of the target UE
  • N is the noise power, which can be determined by measuring the power of the relevant resource block.
  • a plurality of CQIs can be calculated based on the equation (2) calculation, and can be based on the number of received CQIs
  • the quantity, the number of PMIs selects the best CQI and PMI, and feeds back the quantized value of the selected CQI and the PMI to the base station.
  • FIG. 3 is a schematic structural diagram of a channel state information feedback apparatus according to an embodiment of the present invention. As shown in FIG. 3, the apparatus includes: a first sending module, a second sending module, and a determining module;
  • the first sending module is configured to send pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST;
  • the second sending module is configured to send scheduling indication signaling to the target user terminal, to indicate that the target user terminal transmits channel state information; after the pre-activation information and the scheduling indication signaling are received, Determining, by the target user terminal, channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeding back to the base station;
  • the determining module is configured to receive the channel state information that is fed back by the target user terminal, determine whether to activate the MUST according to the channel state information, and determine to activate the multi-user overlay transmission, according to the channel state information. Select the transmission mode of the MUST.
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI.
  • the power ratio of the candidate is a power ratio of the remote user terminal to the target user terminal.
  • the determining module is specifically configured to: determine, according to the channel state information that is fed back, a throughput rate, and determine whether the throughput rate of the activated multi-user overlay transmission is higher than when the multi-user overlay transmission is not activated.
  • the throughput rate, the throughput rate of the activation of the multi-user overlay transmission is higher than the throughput rate when the multi-user overlay transmission is not activated, and determining to activate the multi-user overlay transmission.
  • the determining module is specifically configured to: determine performance of the target user terminal and the remote user terminal in different transmission modes according to the channel state information, and select the target user terminal and the far The transmission mode when the performance of the end user terminal is optimal.
  • FIG. 4 is a schematic flowchart of another channel state information feedback method according to an embodiment of the present invention. As shown in FIG. 4, the method includes:
  • Step 201 the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST;
  • Step 202 The base station sends scheduling indication signaling to the target user terminal, to indicate that the target user terminal transmits channel state information.
  • steps 201 and 202 are the same as the steps 101 and 102, and are not described again.
  • Step 203 After receiving the pre-activation information and the scheduling indication signaling, the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back the channel state information to the Base station
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI;
  • the target user terminal selects a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and selects a power ratio to be used according to the candidate power ratio;
  • the at least one CQI is obtained by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the scheduling indication information further includes: a resource location of the PUCCH or the PUSCH;
  • the channel state information further includes: a PMI;
  • the target user terminal feeds back channel state information to the base station, including:
  • Step 204 The base station receives the channel state information that is fed back by the target user terminal, determines whether to activate the MUST according to the channel state information, and determines that the MUST is selected according to the channel state information when the MUST is activated. The way of transmission.
  • step 204 is the same as step 103, and details are not described herein.
  • FIG. 5 is a schematic structural diagram of a channel state information feedback system according to an embodiment of the present invention; as shown in FIG. 5, the system includes: Base station and target user terminal; wherein
  • the base station is configured to send pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST, and the target user terminal is the base station scheduling the two user terminals in the same time-frequency domain resource.
  • a user terminal that is in the vicinity; sending, to the target user terminal, scheduling indication signaling, to indicate that the target user terminal transmits channel state information; and receiving the channel state information that is fed back by the target user terminal, according to the Determining whether to activate the MUST, determining that the MUST transmission mode is selected according to the channel state information when the MUST is activated;
  • the target user terminal is configured to: after receiving the pre-activation information and the scheduling indication signaling, determine channel state information according to the pre-activation signaling and the scheduling indication signaling, and feed back to the Base station.
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI;
  • the target user terminal is specifically configured to: select a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and select a power ratio to be used according to the power ratio of the candidate; After the channel estimation value and the noise power, the at least one CQI is calculated by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the scheduling indication information further includes: a resource location of the PUCCH or the PUSCH;
  • the channel state information further includes: a PMI;
  • the target user terminal is configured to: extract at least one CQI as the channel state information according to the number of CQIs, or extract at least one CQI according to the number of CQIs, and extract at least one according to the number of the PMIs. PMI, using the extracted CQI and PMI as the channel state information;
  • the embodiment of the present invention further provides a channel state information feedback method, which is applied to the channel state information feedback system; the method includes:
  • the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the MUST;
  • the target user terminal After receiving the pre-activation information and the scheduling indication signaling, the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back to the base station;
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI;
  • the target user terminal selects a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and selects a power ratio to be used according to the candidate power ratio;
  • the at least one CQI is obtained by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the scheduling indication information further includes: a resource location of the PUCCH or the PUSCH;
  • the channel state information further includes: a PMI;
  • the target user terminal feeds back channel state information to the base station, including:
  • the modulation mode of the remote user terminal and the target user terminal according to the period of transmitting the CQI, the designated PUCCH or PUSCH resource
  • the channel state information is fed back at the source location.
  • FIG. 6 is a schematic flowchart of still another channel state information feedback method according to an embodiment of the present invention. As shown in FIG. 6, the method includes:
  • the eNB sends a radio resource control (RRC) to the target UE, and performs pre-activation for the MUST transmission.
  • RRC radio resource control
  • the eNB sends the MUST pre-activation signaling to the target UE, where the MUST pre-activation signaling may include
  • the eNB indicates that the target UE performs various configuration information of the MCU multiple CQI calculations, including: a CQI cycle, a number of CQIs, a number of PMIs, a CQI transmission mode, a candidate power ratio, and a modulation mode combination.
  • the eNB sends downlink control information (DCI) to the target UE, and specifically, sends a MUST scheduling indication instruction, where the MUST scheduling indication signaling is an uplink resource indication that the eNB sends to the target UE about transmitting multiple CQIs. , that is, the resource location of the PUCCH or PUSCH.
  • DCI downlink control information
  • MUST scheduling indication signaling is an uplink resource indication that the eNB sends to the target UE about transmitting multiple CQIs. , that is, the resource location of the PUCCH or PUSCH.
  • the scheduling indication signaling may also include part or all of the configuration information included in the pre-activation signaling.
  • the target UE After receiving the MUST pre-activation signaling and the MUST scheduling indication signaling, the target UE performs a plurality of CQI calculation processes according to the configuration information in the MUST pre-activation signaling, and based on the MUST pre-
  • the configuration information provided in the activation signaling and the uplink resource indication in the MUST scheduling indication signaling perform feedback multiple CQI selection and feedback mechanisms.
  • the eNB determines whether to activate the MUST process and determines the MUST transmission mode, and sends a MUST activation indication to the target UE.
  • a computer storage medium provided by an embodiment of the present invention, wherein a computer program for executing the channel state information feedback method of any of the above embodiments is stored.
  • the method when the computer program located on the computer storage medium is executed by the processor, the method includes:
  • the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal Activating a multi-user superposition transmission MUST;
  • the target user terminal is a base station scheduling, on the same time-frequency domain resource, a user terminal that is close to the base station side of the two user terminals;
  • the channel state information includes: a CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI.
  • the method further includes:
  • the throughput rate is higher than the throughput rate when the multi-user overlay transmission is not activated, and it is determined that the multi-user overlay transmission is activated.
  • the method further includes:
  • the computer program located on the computer storage medium is When the processor executes, it includes:
  • the base station sends pre-activation signaling to the target user terminal, to notify the target user terminal to prepare to activate the multi-user overlay transmission MUST;
  • the target user terminal After receiving the pre-activation information and the scheduling indication signaling, the target user terminal determines channel state information according to the pre-activation signaling and the scheduling indication signaling, and feeds back to the base station;
  • the channel state information includes: a channel quality indicator CQI;
  • the pre-activation signaling or the scheduling indication signaling includes: a transmission mode of the MUST, a candidate power ratio, a modulation mode combination, a period of transmitting the CQI, a quantity of the CQI, and a quantity of a PMI;
  • the method further includes:
  • the target user terminal selects a precoding matrix of the target user terminal and a precoding matrix of the remote user terminal according to the transmission mode, and selects a power ratio to be used according to the candidate power ratio;
  • the at least one CQI is obtained by combining the power ratio, the precoding matrix of the target user terminal, and the precoding matrix of the remote user terminal.
  • the method further includes:
  • the channel state information further includes: a PMI;
  • the target user terminal feeds back channel state information to the base station, including:
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
  • the embodiment of the present invention overcomes the problem that the feedback mode existing in the existing LTE-A is not suitable for the MUST transmission, and thus the channel quality information fed back by the UE is not accurate enough, the base station cannot accurately implement the MUST scheduling, and the system performance is degraded; Improve the comprehensiveness of the channel state information fed back by the target UE, and provide more accurate channel state information for the base station. Based on the more accurate channel state information, the base station can more accurately implement the pairing between the far-end user terminal and the target user terminal in the MUST transmission, and perform the comparison and optimization of the MUST transmission mode selection and the transmission parameter configuration, thereby obtaining a better system. performance.

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Abstract

本发明公开了一种信道状态信息反馈方法，包括：基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输(MUST)；所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述多用户叠加传输时，根据所述信道状态信息选择所述MUST的传输方式。本发明还公开了一种信道状态信息反馈装置和系统、计算机存储介质。

Description

一种信道状态信息反馈方法、装置和系统、存储介质
相关申请的交叉引用
本申请基于申请号为201710105806.0、申请日为2017年02月24日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本申请作为参考。
技术领域
本发明涉及无线接入技术，尤其涉及一种信道状态信息反馈方法、装置和系统、计算机存储介质。
背景技术
在长期演进技术升级版(LTE-A，Long Term Evolution Advanced)系统与第五代移动通信技术(5G，5th-Generation)新空口设计中，非正交接入已经成为一种重要的无线接入方案，同时在第三代合作伙伴计划(3GPP，3rd Generation Partnership Project)R14版本(Rel-14)的标准化中，非正交接入已经被正式确定为一种重要的新型接入方式。
在LTE-A中，目前已经支持多用户叠加传输(MUST，Multiple Users Superposition Transmission)方案。如图1所示，在MUST传输方案中，基站侧可以在相同的时频域资源上调度两个用户终端(UE，User Equipment)，即被调度的两个UE的数据将会在相同的时频资源上叠加在一起传输。在数据分离方面，远端UE与近端UE透明，即远端UE并不知道近端UE的任何信息。远端UE通过大尺度衰落而弱化近端UE的干扰，从而顺利解调；近端UE则要基于基站(eNB)指示的远端UE的传输信息实现干扰消除。
在MUST传输方案中，两个UE在相同的时频资源上被调度。如图1 所示，UE1与UE2分别被称为近端UE与远端UE。在近端UE和远端UE的调度中，基站为近端UE、即UE1配置远端UE、即UE2的传输信息，所述传输信息用来帮助近端UE正确接收自身的数据。而对于远端UE，基站一般不需要配置近端UE的信息，即近端UE对远端UE是透明的。
目前，在MUST传输机制方面，有多种传输机制与参数配置并存，具体包括以下三个方面：
第一，在传输方式方面，MUST有三种传输方式：
方式1：UE1(近端UE)与UE2(远端UE)基于相同的预编码方案叠加传输；
方式2：UE1(近端UE)与UE2(远端UE)基于分集方案(相同的预编码)叠加传输；
方式3：UE1(近端UE)与UE2(远端UE)基于不同的预编码方案叠加传输。
第二，MUST传输还支持远端UE与近端UE采用不同的调制方式组合，当远端UE采用正交相移键控(QPSK，Quadrature Phase Shift Keyin)调制方式，而近端UE可以选择QPSK、正交幅度调制(16QAM，Quadrature Amplitude Modulation)、相正交振幅调制(64QAM，Quadrature Amplitude Modulation)三种调制方式；
即对于近端UE与远端UE而言，可以支持的调制方式组合包括以下几种：(QPSK，QPSK)、(16QAM，QPSK)、(64QAM，QPSK)。
第三，近端UE与远端UE之间还有多种功率比的配置，从而实现不同的组合星座图调制。
基于以上三个方面的传输机制与参数配置的描述，为实施MUST传输方案，eNB需要配置的参数包括传输方式(方式1、方式2、方式3)、调制方式组合((QPSK，QPSK)、(16QAM，QPSK)、(64QAM，QPSK))，以 及近端UE与远端UE之间的功率比。
为了获得良好的MUST传输性能，eNB必须合理配置以上参数，而要实现参数的合理配置，eNB需要基于准确的信道状态信息，这就需要近端UE反馈比较准确而全面的信道状态信息。
同时，在MUST传输过程中，近端UE与远端UE的信道条件会不断发生变化。因此，eNB必须及时了解信道的变化，并基于信道变化的信息灵活地配置MUST传输参数与配对用户，才能实现系统性能的优化。
如果UE反馈的信道状态信息不准确，则eNB所配置的MUST参数就会与UE的信道不匹配，这必将导致系统性能下降。因此，在MUST的调度与传输中，近端UE反馈的信道状态信息的准确性与全面性是保证MUST调度与传输性能优化的关键。
而在当前的LTE反馈机制中，协议仅支持单用户多输入多输出系统(MIMO，Multiple-Input Multiple-Output)反馈。在单用户MIMO的反馈机制中，UE反馈的信道状态信息(CSI，Channel State Information)仅能提供单个UE的预编码矩阵指示(PMI，Precoding Matrix Indicator)、信道质量指示(CQI，Channel Quality Indicator)、秩指示(RI，rank indication)。对于MUST而言，单用户的信道状态信息并不全面，这些信息也不足以为eNB提供比较准确的信道状态信息，这就导致eNB也无法基于这些信道状态信息进行准确的MUST调度。
发明内容
为解决现有存在的技术问题，本发明实施例提供一种信道状态信息反馈方法、装置和系统、计算机存储介质，解决现有技术中存在的反馈方式不适合MUST传输导致用户终端反馈的信道状态信息不准确，基站不能准确实施MUST调度的问题。
为达到上述目的，本发明的技术方案是这样实现的：
本发明实施例提供了一种信道状态信息反馈方法，所述方法包括：
基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
上述方案中，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量。
上述方案中，所述根据所述信道状态信息确定是否激活所述多用户叠加传输，包括：
根据反馈的所述信道状态信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
上述方案中，所述选择所述多用户叠加传输的传输方式，包括：
根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
本发明实施例提供了一种信道状态信息反馈方法，所述方法包括：
基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；
所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；
所述目标用户终端接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
上述方案中，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息，包括：
所述目标用户终端根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；
所述目标用户终端测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
上述方案中，所述调度指示信息，还包括：物理上行链路控制信道物理上行链路控制信道(PUCCH，Physical Uplink Control Channel)或物理上行共享信道(PUSCH，Physical Uplink Shared Channel)的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端将信道状态信息反馈给所述基站，包括：
根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
本发明实施例提供了一种信道状态信息反馈装置，所述装置包括：第一发送模块、第二发送模块和确定模块；其中，
所述第一发送模块，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
所述第二发送模块，配置为向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述确定模块，配置为收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
上述方案中，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量。
上述方案中，所述确定模块，具体配置为：根据反馈的所述信道状态 信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
上述方案中，所述确定模块，具体配置为：根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
所述第一发送模块、第二发送模块、确定模块在执行处理时，可以采用中央处理器(CPU，Central Processing Unit)、数字信号处理器(DSP，Digital Singnal Processor)或可编程逻辑阵列(FPGA，Field－Programmable Gate Array)实现。
本发明实施例提供了一种信道状态信息反馈系统，所述系统，包括：基站和目标用户终端；其中，
所述基站，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST，所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；及，接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式；
所述目标用户终端，配置为在接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站。
上述方案中，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、 候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
所述目标用户终端，具体配置为：根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
上述方案中，所述调度指示信息，还包括：PUCCH或PUSCH的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端，具体配置为：根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
本发明实施例提供的计算机存储介质，其中存储有计算机程序，该计算机程序用于执行上述信道状态信息反馈方法。
本发明实施例所提供的信道状态信息反馈方法，包括：基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指 示信令确定信道状态信息并反馈给所述基站；所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述多用户叠加传输时，根据所述信道状态信息选择所述MUST的传输方式。
采用本发明实施例，克服了现有LTE-A中存在的反馈方式不适合MUST传输，进而导致UE反馈的信道质量信息不够准确、基站不能准确实施MUST调度、系统性能下降的问题；较大幅度提高目标UE反馈的信道状态信息的全面性，为基站提供更加准确的信道状态信息。基于更加准确的信道状态信息，基站可以更加准确地实施MUST传输中的远端用户终端与目标用户终端的配对，进行比较优化的MUST传输方式的选择与传输参数的配置，从而获得较好的系统性能。
附图说明
图1为一种MUST传输系统的结构示意图；
图2为本发明实施例提供的一种信道状态信息反馈方法的流程示意图；
图3为本发明实施例提供的一种信道状态信息反馈装置的结构示意图；
图4为本发明实施例提供的另一种信道状态信息反馈方法的流程示意图；
图5为本发明实施例提供的一种信道状态信息反馈系统的结构示意图；
图6为本发明实施例提供的再一种信道状态信息反馈方法的流程示意图。
具体实施方式
在本发明的各种实施例中，基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述 预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述多用户叠加传输时，根据所述信道状态信息选择所述MUST的传输方式。
下面结合实施例对本发明再作进一步详细的说明。
图2为本发明实施例提供的一种信道状态信息反馈方法的流程示意图；如图2所示，所述方法，包括：
步骤101：eNB向目标UE发送MUST的预激活信令，用以通知所述目标用户终端准备激活MUST；
这里，所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
基站在相同时频域资源上调度两个用户终端中距离基站侧远的用户终端，这里称为远端用户终端。
所述基站，配置为调度目标UE与远端UE；所述基站基于自身所获取的信道状态信息，可以执行MUST传输模式的选择和MUST用户的配对。
所述预激活信令，配置为指示UE准备激活MUST操作；这里，基站将MUST的预激活信令发送给所述目标UE，通知所述目标UE准备激活MUST操作。这里，所述预激活信令可以采用无线资源控制(RRC，Radio Resource Control)信令。
所述预激活信令对应的信元(IE)可以放在PhysicalConfigDedicated与PhysicalConfigDedicatedSCell-r10下，用以指示用户终端预激活MUST。
步骤102：所述基站向所述目标用户终端发送调度指示信令(DCI，Downlink Control Information)，用以指示所述目标用户终端传输信道状态信息；
所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站。
具体地，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，可以包括：传输CQI的周期、CQI的数量、PMI的数量、CQI的传输方式、候选的功率比和调制方式组合；
这里，所述候选的功率比为所述远端用户终端与所述目标用户终端的功率比。
这里，所述CQI的传输方式，包括：方式1(case1)、方式2(case2)、方式3(case3)；其中，
case1：目标UE与远端UE基于相同的预编码方案叠加传输；
case2：目标UE与远端UE基于相同的预编码叠加传输；
case3：目标UE与远端UE基于不同的预编码方案叠加传输。
这里，远端UE与目标UE采用不同的调制方式组合。对于目标UE与远端UE而言，所述调制方式组合，可以包括：(QPSK，QPSK)、(16QAM，QPSK)、(64QAM，QPSK)。
具体来说，所述预激活信令可由RRC信令实现，配置所述预激活信令的方式如下：
must-Enabled-r14 ENUMERATED{true}
说明：true表示预激活MUST；
must-Case ENUMERATED{0 1 2}
说明：0、1、2分别表示MUST的CQI传输方式case1、case2、case3；
must-CQI ENUMERATED{0 1 2 3}
说明：0、1、2、3为反馈的CQI数量；
must-Powerratio ENUMERATED{0 1 2 3 4 5}
说明：0、1、2、3、4、5分别为功率比的指示，分别对应不同的功率比比值；
must-Modumod ENUMERATED{0 1 2}
说明：0、1、2分别为调制方式组合，分别对应着(QPSK，QPSK)(16QAM，QPSK)(64QAM，QPSK)
must-Pmi ENUMERATED{0 1 2 3}
说明：0、1、2、3为反馈的PMI数量的指示，分别对应不同的PMI数量。
需要说明的是，以上信息可以包含在所述预激活信令中传输，也可以包含在所述调度指示信令中传输，不作限定。
具体地，所述调度指示信令作为下行控制指令，用以向所述目标UE发送反馈多个CQI的指示。
这里，PMI/RI/CQI的上行反馈类型分为以下两种：
周期反馈，主要承载在PUCCH上的反馈；
非周期反馈，承载在PUSCH上的反馈。
所述调度指示信令，还包括：PUCCH或PUSCH的资源位置(时频资源)；
这里，所述基站通过调度指示信令通知所述目标UE在指定的PUCCH或PUSCH的资源位置反馈多个CQI、PMI。
例如，所述PUCCH的资源位置的配置方式如下式(1)所示：
nPUCCH＝nCCE+N(1)       (1)
其中，nPUCCH为CQI在PUCCH上的资源位置，nCCE为所调度的远端UE的物理下行控制信道(PDCCH，Physical Downlink Control Channel)的控制信道单元(CCE，Control Channel Element)号码，N(1)为高层配置的参数。
具体地，基于MUST的原理，由于在相同的时频资源上叠加了干扰UE。两个UE(即目标UE和远端UE)的数据传输基于不同的功率比，两个UE 的所述功率比可以参考当前协议(LTE-A或5G的协议)的规定来选择。
两个UE的预编码矩阵也可以不同，这里，所述预编码矩阵可以基于规定的码本(LTE-A或5G的码本)与传输方式来确定。
具体地，所述由目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息，包括：
所述目标UE根据接收的所述传输方式分别确定所述目标UE的预编码矩阵和远端UE的预编码矩阵；
所述目标UE根据接收的所述候选的功率比选择当前使用的功率比；
所述目标UE测量获得目标UE的信道估计值和噪声功率；
根据所述目标UE的预编码矩阵、远端UE的预编码矩阵、当前使用的所述功率比、所述目标UE的信道估计值和噪声功率，计算获得至少一个CQI。
具体地，所述信道状态信息，还可以包括：PMI、RI和/或功率比推荐值等，由所述目标UE根据接收的信息计算获得。例如：
由所述目标用户终端根据所述预激活信令和所述调度指示信令确定PMI，包括：
所述目标UE基于容量最优或信号与干扰加噪声比(SINR，Signal to Interference plus Noise Ratio)最高等准则选择PMI。
步骤103：所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST，则根据所述信道状态信息选择所述MUST的传输方式。
具体地，通过判断激活MUST是否有利于提高系统吞吐率来确定是否激活MUST。
所述根据所述信道状态信息确定是否激活所述MUST，包括：
根据确定的信道状态信息确定系统吞吐率，判断激活所述多用户叠加 传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
具体地，确定每个UE性能最优时的传输方式作为MUST的传输方式。
所述根据所述信道状态信息选择所述MUST的传输方式，包括：
根据所述信道状态信息，确定不同传输方式时的所述目标UE的性能，选择所述目标UE的性能最优时的传输方式。
本发明实施例中，针对目标UE计算CQI做以下说明：
目标UE基于eNB发送的MUST传输方式、参数配置信息及远端UE配对的假设，进行多个CQI与PMI的计算与选择。举例来说，计算CQI与PMI的方法，包括：
假设，接收的RRC信令配置参数为(case3，QPSK+QPSK，0.75，2)，可以确定：远端UE与目标UE采用case3的传输方式，即远端UE与目标UE采用不同的预编码；远端UE与目标UE的调制方式均为QPSK；远端UE与目标UE的功率比为(0.75:1-0.75)；反馈两个最好的CQI；
根据传输方式确定远端UE与目标UE的预编码矩阵，根据远端UE与目标UE的功率比确定当前的功率比；
测量获得所述目标UE的信道估计值和噪声功率；
按下式(2)计算CQI：
Figure PCTCN2017099357-appb-000001
其中，CQIn为第n个CQI，α为远端UE与目标UE的功率比，α＝0.75；P1、P2为远端UE和近端UE的预编码矩阵；s1、s2分别为远端UE与目标UE的符号功率；H1为所述目标UE的信道估计值；N为噪声功率，可以通过测量有关资源块的功率确定。
基于式(2)计算可以算出多个CQI，并可以根据接收的所述CQI的数 量、所述PMI的数量选择最好的几个CQI和PMI，并将选择的CQI的量化值和PMI反馈到所述基站。
图3为本发明实施例提供的一种信道状态信息反馈装置的结构示意图；如图3所示，所述装置，包括：第一发送模块、第二发送模块和确定模块；其中，
所述第一发送模块，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；
所述第二发送模块，配置为向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述确定模块，配置为接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述多用户叠加传输，则根据所述信道状态信息选择所述MUST的传输方式。
具体地，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量。
这里，所述候选的功率比为所述远端用户终端与所述目标用户终端的功率比。
具体地，所述确定模块，具体配置为：根据反馈的所述信道状态信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
具体地，所述确定模块，具体配置为：根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
图4为本发明实施例提供的另一种信道状态信息反馈方法的流程示意图，如图4所示，所述方法包括：
步骤201、基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；
步骤202、所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；
具体地，步骤201、202与所述步骤101、102相同，不再赘述；
步骤203、所述目标用户终端接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并将所述信道状态信息反馈给所述基站；
具体地，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息，包括：
所述目标用户终端根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；
所述目标用户终端测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
具体地，所述调度指示信息，还包括：PUCCH或PUSCH的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端将信道状态信息反馈给所述基站，包括：
根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
步骤204、所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
具体地，步骤204与所述步骤103相同，不再赘述；
相应地，本发明实施例还提供了一种信道状态信息反馈系统，图5为本发明实施例提供的一种信道状态信息反馈系统的结构示意图；如图5所示，所述系统，包括：基站和目标用户终端；其中，
所述基站，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST，所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；及，接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式；
所述目标用户终端，配置为在接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述 基站。
具体地，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
所述目标用户终端，具体配置为：根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
具体地，所述调度指示信息，还包括：PUCCH或PUSCH的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端，具体配置为：根据所述CQI的数量提取至少一个CQI作为所述信道状态信息，或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
相应地，本发明实施例还提供了一种信道状态信息反馈方法，应用于所述信道状态信息反馈系统；所述方法包括：
基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活MUST；
所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；
所述目标用户终端接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
具体地，所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息，包括：
所述目标用户终端根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；
所述目标用户终端测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
具体地，所述调度指示信息，还包括：PUCCH或PUSCH的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端将信道状态信息反馈给所述基站，包括：
根据所述CQI的数量提取至少一个CQI作为所述信道状态信息，或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资 源位置上反馈所述信道状态信息。
图6为本发明实施例提供的再一种信道状态信息反馈方法的流程示意图；如图6所示，所述方法，包括：
所述eNB向目标UE发送无线资源控制(RRC)，为进行MUST传输预激活，具体的，所述eNB向目标UE发送MUST预激活信令；其中，所述MUST预激活信令，可以包括所述eNB指示所述目标UE执行MUST多种CQI计算的各项配置信息，包括：CQI的周期、CQI的数量、PMI的数量、CQI的传输方式、候选的功率比和调制方式组合。
随后，所述eNB向目标UE发送下行控制信息(DCI)，具体的，发送MUST调度指示指令，MUST调度指示信令为所述eNB向所述目标UE发送的关于传输多种CQI的上行资源指示，即PUCCH或者PUSCH的资源位置。
所述调度指示信令也可以包含部分或全部所述预激活信令中所包含的配置信息。
所述目标UE收到所述MUST预激活信令与所述MUST调度指示信令以后，将按照所述MUST预激活信令中的配置信息执行多个CQI的计算过程，并基于所述MUST预激活信令中提供的配置信息以及所述MUST调度指示信令中的上行资源指示执行反馈多种CQI选择与反馈机制。
基于反馈多种CQI选择与反馈结果，所述eNB确定是否激活MUST过程并确定MUST传输方式，发送MUST激活指示给目标UE。
本发明实施例提供的计算机存储介质，其中存储有计算机程序，该计算机程序用于执行上述任一实施例的信道状态信息反馈方法。
一种实施方式中，具体的，位于计算机存储介质的该计算机程序被处理器执行时，包括：
基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准 备激活多用户叠加传输MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
所述信道状态信息，包括：CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量。
具体的，位于计算机存储介质的该计算机程序被处理器执行时，还包括：
根据反馈的所述信道状态信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
具体的，位于计算机存储介质的该计算机程序被处理器执行时，还包括：
根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
另一种实施方式中，具体的，位于计算机存储介质的该计算机程序被 处理器执行时，包括：
基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输MUST；
所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；
所述目标用户终端接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
所述信道状态信息，包括：信道质量指示CQI；
所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、PMI的数量；
具体的，位于计算机存储介质的该计算机程序被处理器执行时，还包括：
所述目标用户终端根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；
所述目标用户终端测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
具体的，位于计算机存储介质的该计算机程序被处理器执行时，还包括：
PUCCH或PUSCH的资源位置；
所述信道状态信息，还包括：PMI；
所述目标用户终端将信道状态信息反馈给所述基站，包括：
根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用硬件实施例、软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本发明是参照根据本发明实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
工业实用性
采用本发明实施例，克服了现有LTE-A中存在的反馈方式不适合MUST传输，进而导致UE反馈的信道质量信息不够准确、基站不能准确实施MUST调度、系统性能下降的问题；较大幅度提高目标UE反馈的信道状态信息的全面性，为基站提供更加准确的信道状态信息。基于更加准确的信道状态信息，基站可以更加准确地实施MUST传输中的远端用户终端与目标用户终端的配对，进行比较优化的MUST传输方式的选择与传输参数的配置，从而获得较好的系统性能。

Claims (15)

  1. 一种信道状态信息反馈方法，所述方法包括：
    基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
    所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
    所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
  2. 根据权利要求1所述的方法，其中，所述信道状态信息，包括：信道质量指示CQI；
    所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、预编码矩阵指示PMI的数量。
  3. 根据权利要求1所述的方法，其中，所述根据所述信道状态信息确定是否激活所述多用户叠加传输，包括：
    根据反馈的所述信道状态信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
  4. 根据权利要求1所述的方法，其中，所述选择所述多用户叠加传输的传输方式，包括：
    根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
  5. 一种信道状态信息反馈方法，所述方法包括：
    基站向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输MUST；
    所述基站向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；
    所述目标用户终端接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
    所述基站接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
  6. 根据权利要求5所述的方法，其中，所述信道状态信息，包括：信道质量指示CQI；
    所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、预编码矩阵指示PMI的数量；
    所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息，包括：
    所述目标用户终端根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；
    所述目标用户终端测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算 获得至少一个CQI。
  7. 根据权利要求6所述的方法，其中，所述调度指示信息，还包括：物理上行链路控制信道PUCCH或物理上行共享信道PUSCH的资源位置；
    所述信道状态信息，还包括：预编码矩阵指示PMI；
    所述目标用户终端将信道状态信息反馈给所述基站，包括：
    根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
    根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
  8. 一种信道状态信息反馈装置，所述装置包括：第一发送模块、第二发送模块和确定模块；其中，
    所述第一发送模块，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输MUST；所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；
    所述第二发送模块，配置为向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；所述预激活信息和所述调度指示信令被接收后，由所述目标用户终端根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站；
    所述确定模块，配置为收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式。
  9. 根据权利要求8所述的装置，其中，所述信道状态信息，包括：信 道质量指示CQI；
    所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、预编码矩阵指示PMI的数量。
  10. 根据权利要求8所述的装置，其中，所述确定模块，具体配置为：根据反馈的所述信道状态信息确定吞吐率，判断激活所述多用户叠加传输的所述吞吐率是否高于未激活所述多用户叠加传输时的吞吐率，激活所述多用户叠加传输的所述吞吐率高于未激活所述多用户叠加传输时的吞吐率，则确定激活所述多用户叠加传输。
  11. 根据权利要求8所述的装置，其中，所述确定模块，具体配置为：根据所述信道状态信息，确定不同传输方式时的所述目标用户终端和所述远端用户终端的性能，选择所述目标用户终端和所述远端用户终端的性能最优时的传输方式。
  12. 一种信道状态信息反馈系统，所述系统，包括：基站和目标用户终端；其中，
    所述基站，配置为向目标用户终端发送预激活信令，用以通知所述目标用户终端准备激活多用户叠加传输MUST，所述目标用户终端为基站在相同时频域资源上调度两个用户终端中距离基站侧近的用户终端；向所述目标用户终端发送调度指示信令，用以指示所述目标用户终端传输信道状态信息；及，接收所述目标用户终端反馈的所述信道状态信息，根据所述信道状态信息确定是否激活所述MUST，确定激活所述MUST时，根据所述信道状态信息选择所述MUST的传输方式；
    所述目标用户终端，配置为在接收预激活信息和所述调度指示信令后，根据所述预激活信令和所述调度指示信令确定信道状态信息并反馈给所述基站。
  13. 根据权利要求12所述的系统，其中，所述信道状态信息，包括：信道质量指示CQI；
    所述预激活信令或所述调度指示信令，包括：所述MUST的传输方式、候选的功率比、调制方式组合、传输所述CQI的周期、所述CQI的数量、预编码矩阵指示PMI的数量；
    所述目标用户终端，具体配置为：根据所述传输方式选择所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，根据所述候选的功率比选择使用的功率比；测量获得信道估计值和噪声功率后，结合所述功率比、所述目标用户终端的预编码矩阵和远端用户终端的预编码矩阵，计算获得至少一个CQI。
  14. 根据权利要求13所述的系统，其中，所述调度指示信息，还包括：物理上行链路控制信道PUCCH或物理上行共享信道PUSCH的资源位置；
    所述信道状态信息，还包括：预编码矩阵指示PMI；
    所述目标用户终端，具体配置为：根据所述CQI的数量提取至少一个CQI作为所述信道状态信息；或者，根据所述CQI的数量提取至少一个CQI，并根据所述PMI的数量提取至少一个PMI，将提取的CQI和PMI作为所述信道状态信息；
    根据所述传输方式、所述远端用户终端与所述目标用户终端的调制方式，按照所述传输所述CQI的周期，在指定的所述PUCCH或PUSCH的资源位置上反馈所述信道状态信息。
  15. 一种计算机存储介质，其中存储有计算机程序，该计算机程序用于执行上述权利要求1-4、5-7任一项所述的信道状态信息反馈方法。
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