WO2011076031A1 - 多点协作联合发送网络中的信息反馈方法、装置和系统 - Google Patents

多点协作联合发送网络中的信息反馈方法、装置和系统 Download PDF

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Publication number
WO2011076031A1
WO2011076031A1 PCT/CN2010/077755 CN2010077755W WO2011076031A1 WO 2011076031 A1 WO2011076031 A1 WO 2011076031A1 CN 2010077755 W CN2010077755 W CN 2010077755W WO 2011076031 A1 WO2011076031 A1 WO 2011076031A1
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Prior art keywords
terminal
cell
long
correlation matrix
base station
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PCT/CN2010/077755
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English (en)
French (fr)
Inventor
郭森宝
彭爱华
魏民
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中兴通讯股份有限公司
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Publication of WO2011076031A1 publication Critical patent/WO2011076031A1/zh

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Classifications

    • 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
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [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
    • 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
    • H04B7/0658—Feedback reduction
    • H04B7/0663—Feedback reduction using vector or matrix manipulations

Definitions

  • the present invention relates to the field of mobile communications, and in particular, to an information feedback method, apparatus and system in a coordinated multi-point transmission network.
  • CoMP Coordinated Multipoint Reception and Transmission
  • CB Coordinated Beamforming
  • JT Joint Transmission
  • the research on JT is mainly divided into two types: independent JT and global JT.
  • the base station uses the CoMP technology to communicate with the terminal, it needs to know the intra-cell information and the inter-cell information of each coordinated cell in the cooperation set, and the information is fed back from the terminal to the base station.
  • the feedback methods of the two are slightly different, and the overall JT also has a large requirement for the type of codebook stored.
  • the storage overhead of the UE is reduced, and single cell independent feedback is generally used, so in order to use a single cell in the global JT Independent feedback, need to add new feedback content, such as phase information between multiple cells.
  • multiple coordinated cells in a coordinated set are used to jointly transmit a combination of multiple coordinated cells, each combination corresponding to phase information between multiple cells, and the phase information is fed back in real time, and the amount of information is compared.
  • the terminal needs a large overhead when feeding back the phase information to the base station.
  • the codebook is used to quantize the inter-cell information, there is a quantization error, and the number of codebooks is limited, which cannot effectively respond to various scenarios, and must be reset.
  • a codebook is used for the reaction of phase information between multiple cells, which has a certain design complexity. Multiple iterations also increase the processing complexity and latency of the UE.
  • the invention provides an information feedback method, device and system in a multi-point cooperative joint transmission network, which solves the problems of large overhead, time extension and high UE processing complexity when the terminal feeds back multi-cell phase information to the base station.
  • a method for information feedback in a multi-point cooperative joint transmission network comprising: a terminal generating a long-term statistical multi-cell correlation matrix of the terminal according to a result of estimating a downlink channel of each coordinated cell, where the long-term statistical multi-cell correlation matrix is used Containing phase information between each coordinated cell;
  • the terminal sends the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to a preset feedback rule.
  • the step of generating, by the terminal, the multi-cell correlation matrix of the long-term statistics of the terminal according to the result of estimating the downlink channel of each coordinated cell may be:
  • R is a multi-cell correlation matrix of long-term statistics
  • ⁇ is a time window of long-term statistics
  • S is the number of sub-bands in the sub-band
  • ⁇ 1 is a cooperative multi-cell combined channel matrix
  • the step of the terminal transmitting the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to the preset feedback rule may be: the terminal sends the long-term statistical multi-cell to the central base station according to the indication of the central base station.
  • the method may further include: the terminal generating channel direction information of each coordinated cell; the terminal transmitting channel direction information of each coordinated cell to the central base station in real time.
  • S is the number of subcarriers in the subband
  • ⁇ adjuent 1 is the cooperative multi-cell combined channel matrix
  • ⁇ [v i' v 2''' v w] T respectively calculate the channel direction information of each coordinated cell, where is the channel direction information, which is the codebook used, V is the vector in the codebook, and N is the corresponding The vector in the codebook of each cell, ⁇ is the long-term statistical multi-cell correlation matrix of the terminal, R s ⁇ H m H H m , ⁇
  • the method may further include: the central base station receiving the long-term statistical multi-cell correlation matrix of the terminal, and storing the long-term statistical multi-cell correlation matrix .
  • the method may further include: receiving, by the central base station, channel direction information of each coordinated cell sent by the terminal, determining a long-term statistical multi-cell correlation matrix corresponding to the terminal; and determining, by the central base station, the channel direction according to the long-term statistical multi-cell correlation matrix corresponding to the terminal.
  • the information is corrected to obtain a precoding vector of the terminal.
  • the central base station corrects the channel direction information according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, and obtains the precoding vector of the terminal.
  • the present invention also provides a terminal, which is applied to information feedback in a coordinated multi-point transmission network, and the terminal includes:
  • the multi-cell correlation matrix generating module of the long-term statistics is configured to generate a multi-cell correlation matrix of the long-term statistics of the terminal according to the result of estimating the downlink channel of each coordinated cell, where the multi-cell correlation matrix of the long-term statistics includes each coordinated cell Phase information between
  • a feedback module configured to send the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to a preset feedback rule.
  • the terminal may further include: a single cell channel direction information generating module, which may be configured to generate channel direction information of each coordinated cell; and the feedback module may be further configured to send channel direction information of each cooperative cell to the central base station in real time.
  • a single cell channel direction information generating module which may be configured to generate channel direction information of each coordinated cell
  • the feedback module may be further configured to send channel direction information of each cooperative cell to the central base station in real time.
  • the present invention also provides a base station for applying information feedback in a coordinated multi-point transmission network, the base station comprising:
  • the information receiving module is configured to receive a long-term statistical multi-cell correlation matrix of the terminal, and store the long-term statistical multi-cell correlation matrix.
  • the information receiving module may be further configured to receive channel direction information of each coordinated cell sent by the terminal, and the base station may further include: a precoding weight correction module, which may be configured to determine a long-term statistical multi-cell correlation matrix corresponding to the terminal, The channel direction information is corrected according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, and the precoding vector of the terminal is obtained.
  • a precoding weight correction module which may be configured to determine a long-term statistical multi-cell correlation matrix corresponding to the terminal, The channel direction information is corrected according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, and the precoding vector of the terminal is obtained.
  • the present invention also provides an information feedback system in a coordinated multi-point transmission network, including a terminal and a central base station;
  • the terminal is configured to: generate, according to a result of the downlink channel estimation of each coordinated cell, a multi-cell correlation matrix of the long-term statistics of the terminal, where the long-term statistical multi-cell correlation matrix includes phase information between the coordinated cells; Transmitting the long-term statistical multi-cell correlation matrix to a central base station of the collaboration set where the terminal is located according to a preset feedback rule;
  • the central base station is configured to receive a long-term statistical multi-cell correlation matrix of the terminal, and store the long-term statistical multi-cell correlation matrix.
  • the terminal may be further configured to generate channel direction information of each coordinated cell, and send channel direction information of each coordinated cell to the central base station; the central base station may also be configured to: receive the associations sent by the terminal The channel direction information of the cell is determined, and the multi-cell correlation matrix corresponding to the long-term statistics corresponding to the terminal is determined, and the channel direction information is corrected according to the multi-cell correlation matrix corresponding to the long-term statistics of the terminal, and the precoding vector of the terminal is obtained.
  • An embodiment of the present invention provides an information feedback method, apparatus, and system in a coordinated multi-point transmission network. After the terminal completes downlink channel estimation for each coordinated cell, the terminal generates the terminal according to the downlink channel estimation result of each coordinated cell.
  • the long-term statistical multi-cell correlation matrix carries the phase information between the coordinated cells in the long-term statistical multi-cell correlation matrix, and sends the long-term statistics to the central base station of the cooperative set where the terminal is located according to a preset feedback rule.
  • the multi-cell correlation matrix because the phase relationship between the cooperative cells is slowly changed, the phase information of the feedback phase information can be extended by the multi-cell correlation matrix feedback phase information of the long-term statistics, thereby reducing the overhead of phase information occupation, and solving the terminal orientation.
  • FIG. 1 is a flowchart of a method for information feedback in a coordinated multi-point transmission network according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for information feedback in a coordinated multi-point transmission network according to Embodiment 3 of the present invention
  • FIG. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a terminal according to another embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of a base station according to still another embodiment of the present invention. Preferred embodiment of the invention
  • a plurality of cooperative ds and zones in the cooperation set are jointly sent to have a combination of multiple coordinated cells, each combination corresponding to phase information between multiple cells, and the amount of information is large, and the terminal feeds back to the base station.
  • phase information requires a large overhead.
  • the terminal needs to quantize the downlink channel estimation result, there is a quantization error of the codebook.
  • the type of the codebook is limited, resulting in a cooperative cell combination used by the base station, and there is no corresponding codebook in the terminal.
  • the nearest codebook can only be compromised, further increasing the quantization error. Therefore, even if the terminal correctly feeds back the inter-cell information and the intra-cell information, the quantization error will affect the accuracy of the information, resulting in poor performance.
  • embodiments of the present invention provide an information feedback method in a coordinated multi-point transmission network.
  • An embodiment of the present invention provides an information feedback method in a multi-point cooperative joint sending network.
  • the process of using the method to complete information feedback is as shown in FIG. 1 , and includes:
  • Step 101 The terminal generates channel direction information of each coordinated cell.
  • N base stations perform cooperation, that is, there are N cooperative base stations performing JT on one UE, and each coordinated base station sends data to the UE through the coordinated cell under it, and the UE according to each
  • the downlink channel estimation result of the cell is calculated by Expression 1, and the channel direction information of each cell is obtained.
  • V m a x ⁇ H s v ⁇ expression
  • the algorithm of using the minimum chord distance and maximizing the gain may be used to select an appropriate codebook vector index.
  • the codebook used by F and V is the vector in the codebook, which is the channel matrix of the corresponding single cell.
  • Step 102 The terminal sends channel direction information of each coordinated cell to the central base station.
  • one of the cooperative base stations has the best signal, and the base station is the central base station, and the corresponding coordinated cell is the primary serving cell, and serves as the central cell.
  • the terminal sends the channel direction information of each coordinated cell and the central cell to the central base station in the form of single cell independent feedback.
  • Step 103 The terminal generates the terminal according to a result of estimating a downlink channel of each coordinated cell. a multi-cell correlation matrix of long-term statistics in the frequency domain and the time domain, wherein the multi-cell correlation matrix of the long-term statistics includes phase information between the cooperative cells;
  • the terminal calculates the long-term matrix of the terminal according to the result of the downlink channel estimation and the expression 2.
  • R expression two
  • H 17 H 2 is a downlink channel matrix (downlink channel estimation result) of each coordinated cell
  • H m is a combined channel matrix of multiple coordinated cells
  • S is the number of sub-bands in the sub-band
  • ⁇ is the time window of long-term statistics (that is, the time range of the downlink channel estimation result used by the long-term statistical multi-cell correlation matrix).
  • ⁇ length is adaptive, and different scene lengths are different.
  • the length can be long, up to l-5s.
  • the time length can also be shortened. .
  • Step 104 The terminal sends, according to the preset multi-cell correlation matrix feedback period of the long-term statistics, a multi-cell correlation matrix of the auto-correlation matrix long-term statistics to the central base station where the terminal is located;
  • the R feedback period is adaptive. For the case of a high-speed UE, since the channel conversion is faster, the transmission period is shortened, and in the case of the low-speed UE, since the channel change is relatively slow, it may be considered to be extended.
  • the terminal may send an indication to the terminal, instructing the terminal to feed back R to the central base station.
  • Step 105 The central base station receives a long-term statistical multi-cell correlation matrix of the terminal, and stores the long-term statistical multi-cell correlation matrix.
  • the central base station receives the long-term statistical multi-cell correlation matrix sent by the terminal, and stores it.
  • the central base station has stored the long-term statistical multi-cell correlation matrix of the terminal before receiving the long-term statistical multi-cell correlation matrix sent by the terminal, replace the multi-cell correlation matrix with the last received long-term statistics. Stored long-term statistical multi-cell correlation matrix.
  • Step 106 The central base station receives channel direction information of each coordinated cell, and determines that the terminal pair is Multi-cell correlation matrix for long-term statistics;
  • Step 107 The central base station corrects the channel direction information according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, and acquires a precoding vector of the terminal.
  • the central base station uses the long-term statistical multi-cell correlation matrix R corresponding to the terminal to correct the channel direction information fed back by the terminal, and obtains the precoding vector of the terminal.
  • the central base station can perform global JT on the terminal among the plurality of coordinated cells using the calculated precoding vector.
  • the information feedback method in the multi-point cooperative joint transmission network generates a long-term statistical multi-cell of the terminal according to the downlink channel estimation result of each coordinated cell after the terminal completes downlink channel estimation for each coordinated cell.
  • a correlation matrix in which the phase information between the coordinated cells is carried in the multi-cell correlation matrix of the long-term statistics, and according to a preset R feedback period (or an indication sent by the central base station), to the central base station of the cooperation set where the terminal is located
  • the multi-cell correlation matrix of the long-term statistics is sent. Since the phase relationship between the coordinated cells is slowly changed, the phase information of the feedback phase information can be extended by the multi-cell correlation matrix feedback phase information of the long-term statistics, thereby reducing the overhead of phase information occupation.
  • the problem that the terminal has a large overhead when feeding back the multi-cell phase information to the base station is solved.
  • the long-term statistical multi-cell correlation matrix also contains adaptive codebook correction information, which reduces the feedback quantization error.
  • N base stations cooperate, that is, there are N cooperative base stations performing JT on two terminals, that is, two terminals have the same cooperation set, and the two terminals occupy part or all of the same time-frequency resources.
  • each coordinated base station needs to simultaneously send data to the two terminals through the coordinated cell under it.
  • Each terminal calculates the channel direction information of each coordinated cell channel according to the downlink channel estimation result of each cell, and then feeds the channel direction information to the central base station in a cell independent feedback manner.
  • Each terminal can select the appropriate codebook vector index by using the algorithm of minimizing the chord distance and maximizing the gain when calculating the channel direction information to select the codebook feedback.
  • the two terminals respectively calculate their long-term statistical multi-cell correlation matrix by using the second expression, and then, in the preset long-term statistical multi-cell correlation matrix feedback period, send the long-term statistics to the central base station of the cooperative set where the terminal is located.
  • Multi-cell correlation matrix
  • the central base station receives and separately stores long-term statistical multi-cell correlation matrices of the two terminals. Upon receiving the channel direction information, the central base station first determines a long-term statistical multi-cell correlation matrix corresponding to the terminal that transmits the channel direction information, and then performs channel direction information fed back by the two terminals respectively. The correction is specifically to obtain a precoding vector applicable to each terminal by using Expression 3 or Expression 4 or Expression 5.
  • the central base station After the central base station knows the precoding vector for the two terminals, it can be based on zero forcing (ZF, Zero Forcing), block diagonalization (BD, Block Diagnolization), and Tomlinson-Halahima precoding (THP, Tomlinson-Harashima Precoding and the Signal to Leakage Noise Ratio (SLNR) algorithm are used to obtain pre-coding vectors for multi-user multiplexing (MU, Multi-User) for each terminal; or the central base station directly selects two correlations.
  • ZF Zero Forcing
  • BD Block Diagnolization
  • TTP Tomlinson-Halahima precoding
  • MU Multi-User
  • the low user precoding vectors are paired, and then the base station side jointly transmits the two terminals according to the precoding vector after the MU, that is, the two terminals multiplex the same resource, receive the same data, and parse the data sent to the terminal. Data to achieve MU under global JT. If there are no more than two pairs of terminals currently paired, the data will be sent directly after pairing calibration.
  • the embodiment of the present invention provides an information feedback method in a multi-point cooperative joint transmission network. On the basis of the first embodiment of the present invention, information feedback when multiple terminals multiplex the same resource is implemented, and the spectrum multiplexing rate is improved. .
  • An embodiment of the present invention provides an information feedback method in a multi-point cooperative joint sending network.
  • the process of using the method to complete information feedback is as shown in FIG. 2, and includes:
  • Step 201 The terminal generates an instantaneous correlation matrix of the terminal according to the result of the downlink channel estimation.
  • the coding vector first generates the instantaneous correlation matrix of the terminal, which is specifically generated according to the expression 6. Select a vector that satisfies the instantaneous value in the codebook of each base station
  • H 17 H 2 is the downlink channel matrix of each cell to the UE
  • H m is a combined channel matrix of multiple cells
  • S is an average over multiple subcarriers.
  • the instantaneous correlation matrix needs to be calculated once every time the terminal is scheduled, that is, as long as the single cell is fed back
  • the channel direction information is calculated once and is instantaneous.
  • the terminal feedback single cell channel direction information is also divided into two types: periodic and non-periodic.
  • the periodic feedback period is 4ms
  • the non-period is not less than lms.
  • Step 202 The terminal generates, according to a result of the downlink channel estimation of each coordinated cell, a multi-cell correlation matrix of the long-term statistics of the terminal, where the long-term statistical multi-cell correlation matrix includes phase information and adaptive precoding between the coordinated cells.
  • Information includes phase information and adaptive precoding between the coordinated cells.
  • Step 203 The terminal generates channel direction information of each coordinated cell.
  • N base stations perform cooperation, that is, there are N cooperative base stations performing JT on one UE, and each coordinated base station sends data to the UE through the coordinated cell under it, and the UE according to each
  • the downlink channel estimation result of the cell is calculated by the expressions VII and VIII, and the channel direction information of each cell is obtained.
  • V v 2 , -, v N f
  • Expression eight (is a precoding vector, is the same concept, but the calculation method is different, the calculated vectors are different, so it is not the same)
  • the best unidirectional vector set in each cell codebook shown in Expression 8 can be determined.
  • ⁇ is the eigenvalue diagonal matrix of R s .
  • Step 204 The terminal sends the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to the preset multi-cell correlation matrix feedback period of the long-term statistics.
  • Step 205 The central base station receives a long-term statistical multi-cell correlation matrix of the terminal, and stores the long-term statistical multi-cell correlation matrix.
  • the central base station receives the long-term statistical multi-cell correlation matrix sent by the terminal, and stores it.
  • the central base station stores the long-term statistical multi-cell correlation matrix of the terminal before receiving the long-term statistical multi-cell correlation matrix sent by the terminal.
  • the multi-cell correlation matrix is calculated to replace the stored long-term statistical multi-cell correlation matrix.
  • Step 206 The central base station receives channel direction information of each coordinated cell, and determines a multi-cell correlation matrix corresponding to the long-term statistics of the terminal.
  • Step 207 The central base station corrects the channel direction information according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, and acquires a precoding vector of the terminal.
  • the central base station uses the long-term statistical multi-cell correlation matrix R corresponding to the terminal to correct the channel direction information fed back by the terminal, and obtains the precoding vector of the terminal according to the expression 3.
  • An embodiment of the present invention provides an information feedback method in a coordinated multi-point transmission network.
  • the long-term statistics of the terminal are generated according to the downlink channel estimation result of each coordinated cell.
  • a cell correlation matrix in which the multi-cell correlation matrix of the long-term statistics carries phase information between the coordinated cells, and sends the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to a preset feedback rule.
  • the phase information of the feedback phase information can be extended by the multi-cell correlation matrix feedback phase information of the long-term statistics, thereby reducing the overhead occupied by the phase information, and solving the problem that the terminal feeds back the multi-cell to the base station.
  • the problem of large overhead in phase information reduces the amount of storage of the codebook on the terminal and the complexity of terminal processing.
  • the best single cell direction vector in the codebook of each coordinated cell is determined, so that the base station obtains an optimal precoding vector, which further improves the system efficiency.
  • the long-term statistical multi-cell correlation matrix also contains adaptive codebook correction information, which reduces the feedback quantization error.
  • N base stations cooperate, that is, there are N cooperative base stations performing JT on two terminals, that is, two terminals have the same cooperation set, and the two terminals occupy part or all of the same time-frequency resources.
  • each coordinated base station needs to simultaneously send data to the two terminals through the coordinated cell under it.
  • the central base station needs to obtain the precoding vectors of the two terminals separately, and the process is the same as that described in the third embodiment of the present invention, and the description thereof will not be repeated.
  • the precoding vector of each terminal MU may be obtained according to the ZF, or the algorithms such as BD, SLNR, or the base.
  • the station directly selects two less relevant user precoding vectors for pairing.
  • the base station side performs joint transmission on multiple UEs according to the multi-user multiplexed precoding vector, and multiple UEs can use DMRS to perform data demodulation, thereby implementing multi-user multiplexing under global JT.
  • the embodiment of the present invention implements information feedback when multiple terminals multiplex the same resource on the basis of the third embodiment of the present invention.
  • the embodiment of the present invention provides an information feedback method in a multi-point cooperative joint transmission network.
  • information feedback when multiple terminals multiplex the same resource is implemented, and the spectrum multiplexing rate is improved. .
  • the embodiment of the present invention further provides a terminal.
  • the structure of the terminal is as shown in FIG. 3, and includes:
  • the multi-cell correlation matrix generation module 301 of the long-term statistics is configured to generate a multi-cell correlation matrix of the long-term statistics of the terminal according to the result of the downlink channel estimation of each coordinated cell, where the multi-cell correlation matrix of the long-term statistics includes each collaboration Phase information of the small interval;
  • the feedback module 302 is configured to send the long-term statistical multi-cell correlation matrix to the central base station of the collaboration set where the terminal is located according to a preset feedback rule.
  • the foregoing terminal further includes:
  • a single cell channel direction information generating module 303 configured to generate channel direction information of each coordinated cell
  • the feedback module 302 is further configured to send channel direction information of each coordinated cell to the central base station.
  • the terminal is as shown in FIG. 4, and further includes:
  • the instantaneous multi-cell coherent matrix generation module 304 is configured to generate an instantaneous correlation matrix of the terminal according to a result of the downlink channel estimation;
  • the single-cell channel direction information generating module 303 is further configured to generate the instantaneous correlation matrix generated by the long-term statistical multi-cell correlation matrix and the instantaneous multi-cell coherent matrix generation module 304 generated by the long-term statistical multi-cell correlation matrix generation module 301. , generating the channel direction of each coordinated cell Information.
  • the embodiment of the present invention further provides a base station, and the structure thereof is as shown in FIG. 5.
  • the method includes:
  • the information receiving module 501 is configured to receive a long-term statistical multi-cell correlation matrix of the terminal, and store the long-term statistical multi-cell correlation matrix.
  • the information receiving module 501 is further configured to receive channel direction information of each coordinated cell sent by the terminal, and the base station, as shown in FIG. 6, further includes:
  • the precoding weight correction module 502 is configured to determine a long-term statistical multi-cell correlation matrix corresponding to the terminal, and correct the channel direction information according to the long-term statistical multi-cell correlation matrix corresponding to the terminal, to obtain a precoding vector. .
  • An embodiment of the present invention further provides an information feedback system in a multi-point cooperative joint transmission network, where a network using a multi-point cooperation technology includes a terminal and a central base station;
  • the terminal is configured to generate a long-term statistical multi-cell correlation matrix of the terminal according to a result of estimating a downlink channel of each coordinated cell, where the long-term statistical multi-cell correlation matrix includes phase information between the coordinated cells, according to the preset a feedback rule, sending the long-term statistical multi-cell correlation matrix to a central base station of the collaboration set where the terminal is located;
  • the central base station is configured to receive a long-term statistical multi-cell correlation matrix of the terminal, and store the long-term statistical multi-cell correlation matrix.
  • the terminal is further configured to generate channel direction information of each coordinated cell, and send channel direction information of each coordinated cell to the central base station;
  • the central base station is further configured to receive channel direction information of each coordinated cell sent by the terminal, determine a long-term statistical multi-cell correlation matrix corresponding to the terminal, and compare the multi-cell correlation according to the long-term statistics corresponding to the terminal The matrix corrects the channel direction information to obtain a precoding vector of the terminal.
  • the information feedback system in the terminal, the base station, and the multi-point cooperative joint transmission network may be combined with the information feedback method in the multi-point cooperative joint transmission network provided by the embodiment of the present invention, and the terminal completes the downlink for each coordinated cell.
  • the terminal completes the downlink for each coordinated cell.
  • a multi-cell correlation matrix of the long-term statistics of the terminal is generated, and the multi-cell correlation in the long-term statistics is generated.
  • the matrix carries the phase information between the coordinated cells, and sends the long-term statistical multi-cell correlation matrix to the central base station of the cooperation set where the terminal is located according to the preset feedback rule, because the phase relationship between the coordinated cells is slowly changed.
  • the phase information of the feedback phase information can be extended by the multi-cell correlation matrix feedback phase information of the long-term statistics, thereby reducing the overhead of the phase information occupation, and solving the problem that the terminal has a large overhead when feeding back the multi-cell phase information to the base station, and reducing the terminal.
  • the long-term statistical multi-cell correlation matrix also contains adaptive codebook correction information, which reduces the feedback quantization error.
  • each functional unit in each embodiment of the present invention may be implemented in the form of hardware, or may be implemented in the form of a software functional module.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • the present invention solves the problem that the terminal has a large overhead when feeding back the multi-cell phase information to the base station, reduces the storage amount of the codebook on the terminal and the complexity of the terminal processing, and the long-term statistical multi-cell correlation matrix is further Contains adaptive codebook correction information, reducing feedback quantization error.

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Abstract

本发明提供一种多点协作联合发送网络中的信息反馈方法、装置和系统，所述方法包括：终端根据对各协作小区下行信道估计的结果，生成所述终端的长期统计的多小区相关矩阵，所述长期统计的多小区相关矩阵中包含各协作小区间的相位信息；所述终端按照预置的反馈规则，向所述终端所在协作集的中心基站发送所述长期统计的多小区相关矩阵。本发明解决了终端向基站反馈多小区相位信息时开销大的问题，减少了终端上码本的存储量和终端处理的复杂度，减少了反馈量化误差。

Description

多点协作联合发送网络中的信息反馈方法、 装置和系统
技术领域
本发明涉及移动通信领域， 尤其涉及一种多点协作联合发送网络中的信 息反馈方法、 装置和系统。
背景技术
在长期演进高级系统 ( Long term evolution advanced system , 简称 LTE-Advanced )中，为了提高小区平均的频谱利用率和小区边缘频谱利用率， 釆用了多点协作 ( CoMP, Coordinated Multipoint Reception and Transmission ) 技术和多天线增强技术。 CoMP技术分为协同波束成形 （CB , Coordinated Beamforming )和联合发送（ JT, Joint Transmission )技术， 可以在很大程度上 提高小区的平均频谱效率和小区边缘用户的服务质量。特别是 JT可以很大程 度上使得边缘 d、区信道质量较差的服务质量得到保证。
目前关于 JT的研究主要分为独立 JT和全局 JT两种，基站使用 CoMP技 术与终端进行通信时， 需要获知协作集中各协作小区的小区内信息和小区间 信息， 这些信息由终端向基站反馈。 但是两者的反馈方式略有不同， 而且全 局 JT对存储的码本类型量也有较大的要求。为了保证 CoMP在不同发送模式 下的反馈类型尽量统一， 而且 UE侧存储的码本类型较少，减少 UE的存储开 销，一般釆用单小区独立反馈，所以为了在全局 JT下也釆用单小区独立反馈， 需要添加新的反馈内容， 如多小区间的相位信息。
在上述通过单小区独立反馈的形式反馈小区内信息和小区间信息的过程 中， 存在如下问题：
对于一个终端来说， 使用协作集中的多个协作小区进行联合发送有多种不 同协作小区的组合， 每个组合都对应一个多小区间的相位信息， 且相位信息是 实时反馈的， 信息量较大， 终端向基站反馈这些相位信息时需要较大开销。
此外， 在反馈小区间信息时， 需要使用码本对小区间信息进行量化处理， 存在量化误差， 且码本数量有限， 不能有效的反应各种场景， 还必须重新设 计一种码本用于多小区间相位信息的反应， 有一定设计复杂度。 多次迭代处 理也增加了 UE的处理复杂度和时延。
发明内容
本发明提供了一种多点协作联合发送网络中的信息反馈方法、 装置和系 统， 解决了终端向基站反馈多小区相位信息时开销大、 时延长、 UE处理复杂 度高的问题。
一种多点协作联合发送网络中的信息反馈方法， 包括： 终端根据对各协 作小区下行信道估计的结果， 生成所述终端的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵中包含各协作小区间的相位信息；
所述终端按照预置的反馈规则， 向所述终端所在协作集的中心基站发送 该长期统计的多小区相关矩阵。
终端根据对各协作小区下行信道估计的结果， 生成所述终端的长期统计 的多小区相关矩阵的步骤可以为：
终端根据表达式 R = , 计算获取该终端的长期统计的多
Figure imgf000004_0001
小区相关矩阵， 其中， R为长期统计的多小区相关矩阵， Γ为长期统计的时间 窗， S为子带内子载波的个数， ^„1为协作多小区组合信道矩阵，
Hm = [Ηι,Η2,· · ·,ΗΝ_ι,ΗΝ]。 终端按照预置的反馈规则， 向所述终端所在协作集的中心基站发送该长 期统计的多小区相关矩阵的步骤可以为： 终端按照中心基站的指示， 向该中 心基站发送该长期统计的多小区相关矩阵； 或者， 终端按照当前的工作状态， 自适应确定长期统计的多小区相关矩阵反馈周期， 按照该周期反馈长期统计 的多小区相关矩阵。 该方法还可包括： 终端生成各个协作小区的信道方向信息； 终端实时向 中心基站发送各个协作小区的信道方向信息。 终端生成各个协作小区的信道 方向信息的步骤可以为：终端通过表达式 = max 11 H 11分别计算各协作小区的 信道方向信息， 其中， 为信道方向信息， 为釆用的码本， V为码本中的矢 量， 为单小区信道矩阵。 终端生成各个协作小区的信道方向信息的步骤可以包括： 终端根据表达 式 =1 H H∞生成该终端的瞬时相关矩阵， 其中， 为该终端的瞬时相
I ^ I 5
关矩阵， S为子带内子载波的个数， ^„1为协作多小区组合信道矩阵，
Hm=[Hl,H2,---,HN_l,HN] ； 以 及 终 端 通 过 表 达 式 V= argmin || -(R /2f *∑1/2 ])1/2 ||F
vx,v2,--.vN F 和
^ = [vi'v2'' 'vw]T分别计算各协作小区的信道方向信息， 其中， 为信道方向信 息， 为釆用的码本， V为码本中的矢量， N为对应于各个小区的码本中的 矢量， ^为终端的长期统计的多小区相关矩阵， Rs ∑丄∑Hm HHm , ∑为
T T \ S \ s
长期统计的多小区相关矩阵 的特征值对角矩阵。 该方法在向终端所在协作集的中心基站发送该长期统计的多小区相关矩 阵的步骤之后还可包括： 中心基站接收终端的长期统计的多小区相关矩阵， 并存储该长期统计的多小区相关矩阵。 该方法还可包括： 中心基站接收终端 发送的各协作小区的信道方向信息， 确定与该终端对应的长期统计的多小区 相关矩阵； 中心基站根据终端对应的长期统计的多小区相关矩阵对信道方向 信息进行校正， 获取终端的预编码矢量。 中心基站根据该终端对应的长期统 计的多小区相关矩阵对信道方向信息进行校正， 获取该终端的预编码矢量的 步骤可
W
Figure imgf000005_0001
进行计算，获取 终端对应的预编码适量， 其中， W为预编码矢量， R为长期统计的多小区相 关矩阵， 、 ρ ...^为各协作小区的信道方向信息。 本发明还提供了一种终端，应用在多点协作联合发送网络中的信息反馈， 该终端包括：
长期统计的多小区相关矩阵生成模块， 其设置成根据对各协作小区下行 信道估计的结果， 生成所述终端的长期统计的多小区相关矩阵， 该长期统计 的多小区相关矩阵中包含各协作小区间的相位信息；
反馈模块， 其设置成按照预置的反馈规则， 向所述终端所在协作集的中 心基站发送该长期统计的多小区相关矩阵。
该终端还可包括： 单小区信道方向信息生成模块， 其可设置成生成各个 协作小区的信道方向信息； 反馈模块还可设置成向中心基站实时发送各个协 作小区的信道方向信息。
本发明还提供了一种基站，应用在多点协作联合发送网络中的信息反馈， 该基站包括：
信息接收模块， 其设置成接收终端的长期统计的多小区相关矩阵， 并存 储该长期统计的多小区相关矩阵。
信息接收模块还可设置成接收终端发送的各协作小区的信道方向信息， 该基站还可包括： 预编码权值校正模块， 其可设置成确定与终端对应的长期 统计的多小区相关矩阵， 才艮据终端对应的长期统计的多小区相关矩阵对信道 方向信息进行校正， 获取终端的预编码矢量。
本发明还提供了一种多点协作联合发送网络中的信息反馈系统， 包括终 端和中心基站；
所述终端设置成： 根据对各协作小区下行信道估计的结果， 生成所述终 端的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵中包含各协 作小区间的相位信息； 以及， 按照预置的反馈规则， 向所述终端所在协作集 的中心基站发送该长期统计的多小区相关矩阵；
所述中心基站设置成接收终端的长期统计的多小区相关矩阵， 并存储该 长期统计的多小区相关矩阵。
终端还可设置成生成各个协作小区的信道方向信息， 并向中心基站发送 各个协作小区的信道方向信息； 中心基站还可设置成： 接收终端发送的各协 作小区的信道方向信息， 确定与终端对应的长期统计的多小区相关矩阵， 并 根据终端对应的长期统计的多小区相关矩阵对信道方向信息进行校正， 获取 终端的预编码矢量。
本发明的实施例提供了一种多点协作联合发送网络中的信息反馈方法、 装置和系统， 在终端对各协作小区完成下行信道估计后， 根据各协作小区的 下行信道估计结果， 生成终端的长期统计的多小区相关矩阵， 在该长期统计 的多小区相关矩阵中携带各协作小区间的相位信息，并按照预置的反馈规则， 向所述终端所在协作集的中心基站发送该长期统计的多小区相关矩阵， 由于 各协作小区间的相位关系是慢变的， 故通过长期统计的多小区相关矩阵反馈 相位信息可以延长反馈相位信息的周期， 从而减少相位信息占用的开销， 解 决了终端向基站反馈多小区相位信息时开销大的问题， 减少了终端上码本的 存储量和终端处理的复杂度， 且长期统计的多小区相关矩阵还含有自适应码 本校正信息， 减少了反馈量化误差。 附图概述
图 1为本发明的实施例一提供的一种多点协作联合发送网络中的信息反 馈方法的流程图；
图 2为本发明的实施例三提供的一种多点协作联合发送网络中的信息反 馈方法的流程图；
图 3为本发明的实施例提供的一种终端的结构示意图；
图 4为本发明的又一实施例提供的一种终端的结构示意图；
图 5为本发明的实施例提供的一种基站的结构示意图；
图 6为本发明的又一实施例提供的一种基站的结构示意图。 本发明的较佳实施方式
对于一个终端来说， 使用协作集中的多个协作 d、区进行联合发送有多种 不同协作小区的组合， 每个组合都对应一个多小区间的相位信息， 信息量较 大， 终端向基站反馈这些相位信息时需要较大开销。 而且由于终端需要对下行信道估计结果进行量化， 故存在码本的量化误 差； 此外， 码本的种类是有限的， 导致对于基站使用的一个协作小区组合， 终端中并没有相应的码本， 这时只能折中取最接近的码本， 进一步加大了量 化误差。 因此， 即使终端正确的反馈了小区间信息和小区内信息， 量化误差 也会影响信息的准确性， 从而导致性能并不理想。
多次迭代增加了 UE的处理复杂度和时延， 还必须重新设计一种码本用 于多小区间相位信息的反应， 有一定设计复杂度， 增加了 UE中的存储开销。
为了解决上述问题， 本发明的实施例提供了一种多点协作联合发送网络 中的信息反馈方法。
首先对本发明的实施例一进行介绍。
本发明实施例提供了一种多点协作联合发送网络中的信息反馈方法， 使 用该方法完成信息反馈的过程如图 1所示， 包括：
步骤 101、 终端生成各个协作小区的信道方向信息；
本发明实施例中， 假定 N个基站进行协同， 即有 N个协作基站在对 1个 UE进行 JT, 这时每个协作基站均通过其下的协作小区给 UE下发数据， UE 根据每个小区的下行信道估计结果， 通过表达式一来进行计算， 求得每个小 区的信道方向信息。
V = max \\ Hsv \\ 表达式一
UE在计算信道方向信息选择码本反馈时，可以釆用弦距离最小和最大化 增益的算法来选择合适的码本矢量索引。其中 为选择的信道方向信息， F 釆用的码本， V为码本中的矢量， 为相应单小区的信道矩阵。
步骤 102、 终端向中心基站发送各协作小区的信道方向信息；
在向同一终端进行 JT的多个协作基站中， 有一个协作基站的信号最好， 将该基站作为中心基站， 其对应的协作小区即为主服务小区， 作为中心小区。
本步骤中， 终端以单小区独立反馈的形式， 向中心基站发送各个协作小 区及中心小区的信道方向信息。
步骤 103、 终端根据对各协作小区下行信道估计的结果， 生成所述终端 的频域和时域的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵 中包含各协作小区间的相位信息；
本步骤中， 终端根据下行信道估计的结果和表达式二， 计算得出该终端 的长期统 矩阵。 R = 表达式二
Figure imgf000009_0001
其中 H17H2, 为各个协作小区的下行信道矩阵（下行信道估计结 果） ， Hm为多个协作小区的组合信道矩阵，
Figure imgf000009_0002
S为子 带内子载波的个数， ： Γ为长期统计的时间窗 （即长期统计的多小区相关矩阵 釆用的下行信道估计结果的时间范围） 。
需要说明的是， ： Γ的长度是自适应的， 不同的场景长度不同， 在低速 UE 的情况下， 长度可以很长， 达 l-5s, 在 UE特性快速变化时， 也可以将时间 长度缩短。
步骤 104、终端按照预置的长期统计的多小区相关矩阵反馈周期， 向所述终 端所在协作集的中心基站发送该自相关矩阵长期统计的多小区相关矩阵；
本步骤中， R反馈周期是自适应的， 对于高速 UE的情况下， 由于信道 变换比较快， 这时就要缩短发送周期， 而对于低速 UE的情况下， 由于信道 变化比较慢， 可以考虑延长反馈周期， 这时 R的统计时间也相应的加长。
可选地， 也可以在中心基站需要多小区间信息的时候， 向终端下发指示， 指示终端向中心基站反馈 R。
步骤 105、 中心基站接收终端的长期统计的多小区相关矩阵， 并存储该 长期统计的多小区相关矩阵；
本步骤中， 中心基站接收终端发送的长期统计的多小区相关矩阵， 并存 储起来。
可选地， 如果中心基站在接收到终端发送的长期统计的多小区相关矩阵 前已存储有该终端的长期统计的多小区相关矩阵， 则用最后接收到的长期统 计的多小区相关矩阵去替换存储的长期统计的多小区相关矩阵。
步骤 106、 中心基站接收各协作小区的信道方向信息， 确定与该终端对 应的长期统计的多小区相关矩阵；
步骤 107、 中心基站根据所述终端对应的长期统计的多小区相关矩阵对 所述信道方向信息进行校正， 获取该终端的预编码矢量；
本步骤中， 中心基站利用终端对应的长期统计的多小区相关矩阵 R来对 终端反馈的信道方向信息进行校正， 获取该终端的预编码矢量。
获取预编码矢量的方法有多种， 如表达式三、 表达式四或表达式五。 v2
vN―、
\\ (RV2y
Figure imgf000010_0001
表达式三 ν2
ν
W = -
νΝ 表达式四
Figure imgf000010_0002
表达式五 其中， ^^…^ ^为 UE反馈给基站的各个协作小区的信道方向信息, W为终端对应的预编码矢量。
此后， 中心基站就可以利用计算得出的预编码矢量在多个协作小区间对 终端进行全局的 JT。
本发明实施例提供的一种多点协作联合发送网络中的信息反馈方法， 在 终端对各协作小区完成下行信道估计后， 根据各协作小区的下行信道估计结 果， 生成终端的长期统计的多小区相关矩阵， 在该长期统计的多小区相关矩 阵中携带各协作小区间的相位信息， 并按照预置的 R反馈周期 （或中心基站 下发的指示） ， 向所述终端所在协作集的中心基站发送该长期统计的多小区 相关矩阵， 由于各协作小区间的相位关系是慢变的， 故通过长期统计的多小 区相关矩阵反馈相位信息可以延长反馈相位信息的周期， 从而减少相位信息 占用的开销， 解决了终端向基站反馈多小区相位信息时开销大的问题。 且长 期统计的多小区相关矩阵还含有自适应码本校正信息，减少了反馈量化误差。
下面， 对本发明的实施例二进行说明。
假定 N个基站协同，也就是有 N个协作基站对两个终端进行 JT , 即两个 终端拥有同样的协作集，而且这两个终端占用部分或者全部相同的时频资源。 这时， 每个协作基站都需要通过其下的协作小区同时给两个终端下发数据。
每个终端根据每个小区的下行信道估计结果，通过表达式一来进行计算， 求得每个协作小区信道的信道方向信息， 然后以小区独立反馈的方式将信道 方向信息反馈给中心基站。
每个终端在计算信道方向信息选择码本反馈时可以釆用弦距离最小和最 大化增益的算法来选择合适的码本矢量索引。
两个终端分别通过表达式二计算自己的长期统计的多小区相关矩阵， 然 后， 在预置的长期统计的多小区相关矩阵反馈周期， 向所述终端所在协作集 的中心基站发送该长期统计的多小区相关矩阵。
中心基站接收并分别存储两个终端的长期统计的多小区相关矩阵。 在接 收到信道方向信息时， 中心基站首先确定发送该信道方向信息的终端对应的 长期统计的多小区相关矩阵， 然后分别对两个终端反馈的信道方向信息进行 校正， 具体为通过表达式三或表达式四或表达式五， 获取各终端适用的预编 码矢量。
在中心基站得知对两个终端的预编码矢量后， 可以根据迫零（ZF, Zero Forcing ) , 块对角化（BD, Block Diagnolization ) , 汤姆林森-哈拉希玛预编 码（ THP , Tomlinson-Harashima Precoding )和信漏噪比（ SLNR , Signal to Leakage Noise Ratio ) 算法等求每个终端多用户复用 （MU, Multi-User ) 的预编码矢 量； 或者中心基站直接挑选两个相关性较低的用户预编码矢量进行配对， 然 后基站侧根据 MU后的预编码矢量对两个终端进行联合发送， 即两个终端复 用同一块资源， 接收同样的数据， 并从中解析向本终端发送的数据， 从而实 现全局 JT下的 MU。 如果当前不存在配对的两个以上终端， 则不配对校准后 直接发送数据。
本领域技术人员显然知道， 也可以在同一块资源上复用大于两个终端， 其实现原理与本实施例上述过程实现原理无异， 不再赘述。
本发明实施例提供了一种多点协作联合发送网络中的信息反馈方法， 在 本发明的实施例一的基础上， 实现了多终端复用同一资源时的信息反馈， 提 高了频谱复用率。
下面结合附图， 对本发明的实施例三进行说明。
本发明实施例提供了一种多点协作联合发送网络中的信息反馈方法， 使 用该方法完成信息反馈的过程如图 2所示， 包括：
步骤 201、 终端才艮据下行信道估计的结果， 生成该终端的瞬时相关矩阵； 本步骤中， 为了使得中心基站可以通过终端的长期统计的多小区相关矩 阵和预编码矢量较好的恢复出预编码矢量， 首先生成终端的瞬时相关矩阵， 具体为根据表达式六生成。 每个基站的码本中选择一个满足瞬间值的矢量
^ =^∑^¾ 表达式六
I ύ I 5
其中 H17H2, 为各个小区到 UE的下行信道矩阵， Hm为多个小区 的组合信道矩阵， S为在多个子载波上的平均。
瞬时相关矩阵在每次调度该终端时都需要计算一次， 即只要反馈单小区 信道方向信息就计算一次， 是瞬时的。 而终端反馈单小区信道方向信息也分 为周期性和非周期性两种形式， 如周期性反馈的周期为 4ms, 非周期不得小 于 lms„
步骤 202、 终端根据对各协作小区下行信道估计的结果， 生成所述终端 的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵中包含各协作 小区间的相位信息和自适应预编码信息；
本步骤中， 根据表达式二生成终端的长期统计的多小区相关矩阵。
步骤 203、 终端生成各个协作小区的信道方向信息；
本发明实施例中， 假定 N个基站进行协同， 即有 N个协作基站在对 1个 UE进行 JT, 这时每个协作基站均通过其下的协作小区给 UE下发数据， UE 根据每个小区的下行信道估计结果， 通过表达式七和表达式八来进行计算， 求得每个小区的信道方向信息。
V = argmin ||
Figure imgf000013_0001
||F
表达式七
V = v2,-,vNf 表达式八（是预编码矢量， 是同一概念， 但是计算方 法不同， 计算出的矢量不同， 所以不是同一个）
通过表达式七， 可以确定表达式八所示的各小区码本中最佳的单方向矢 量集合。 其中， 为多小区间的信道方向信息， 为各个小区釆用的码本， . ,/ = l,2,...,N为对应于各个小区的码本中的矢量。 为终端的瞬时相关矩阵， 为终端的长期统计的多小区相关矩阵， ∑为 Rs的特征值对角矩阵。
步骤 204、 终端按照预置的长期统计的多小区相关矩阵反馈周期， 向所 述终端所在协作集的中心基站发送该长期统计的多小区相关矩阵；
步骤 205、 中心基站接收终端的长期统计的多小区相关矩阵， 并存储该 长期统计的多小区相关矩阵；
本步骤中， 中心基站接收终端发送的长期统计的多小区相关矩阵， 并存 储起来。
可选地， 如果中心基站在接收到终端发送的长期统计的多小区相关矩阵 前已存储有该终端的长期统计的多小区相关矩阵， 则用最后接收到的长期统 计的多小区相关矩阵去替换存储的长期统计的多小区相关矩阵。
步骤 206、 中心基站接收各协作小区的信道方向信息， 确定与该终端对 应的长期统计的多小区相关矩阵；
步骤 207、 中心基站根据所述终端对应的长期统计的多小区相关矩阵对 所述信道方向信息进行校正， 获取该终端的预编码矢量；
本步骤中， 中心基站利用终端对应的长期统计的多小区相关矩阵 R来对 终端反馈的信道方向信息进行校正，根据表达式三获取该终端的预编码矢量。
本发明的实施例提供了一种多点协作联合发送网络中的信息反馈方法， 在终端对各协作小区完成下行信道估计后， 根据各协作小区的下行信道估计 结果， 生成终端的长期统计的多小区相关矩阵， 在该长期统计的多小区相关 矩阵中携带各协作小区间的相位信息， 并按照预置的反馈规则， 向所述终端 所在协作集的中心基站发送该长期统计的多小区相关矩阵， 由于各协作小区 间的相位关系是慢变的， 故通过长期统计的多小区相关矩阵反馈相位信息可 以延长反馈相位信息的周期， 从而减少相位信息占用的开销， 解决了终端向 基站反馈多小区相位信息时开销大的问题， 减少了终端上码本的存储量和终 端处理的复杂度。 此外， 通过引入瞬时相关矩阵， 确定各协作小区的码本中 最佳的单小区方向矢量， 使得基站获得最优的预编码矢量， 进一步提高了系 统效率。 且长期统计的多小区相关矩阵还含有自适应码本校正信息， 减少了 反馈量化误差。
下面， 对本发明的实施例四进行说明。
本发明实施例中， 假定 N个基站协同， 也就是有 N个协作基站对两个终 端进行 JT, 即两个终端拥有同样的协作集， 而且这两个终端占用部分或者全 部相同的时频资源。 这时， 每个协作基站都需要通过其下的协作小区同时给 两个终端下发数据。
首先， 中心基站需要分别获取两个终端的预编码矢量， 其过程与本发明 的实施例三中所述流程无异， 在些不再重复说明。
在中心基站分别获取了两个终端的长期统计的多小区相关矩阵后， 可以 根据 ZF, 或者是 BD, SLNR等算法求每个终端 MU的预编码矢量， 或者基 站直接挑选两个相关性较低的用户预编码矢量进行配对。 然后基站侧根据多 用户复用后的预编码矢量对多个 UE进行联合发送，多个 UE可以利用 DMRS 来进行数据的解调， 从而实现全局 JT下的多用户复用。
本发明实施例在本发明的实施例三的基础上， 实现了多终端复用同一资 源时的信息反馈。
本领域技术人员显然知道， 也可以在同一块资源上复用大于两个终端， 其实现原理与本实施例上述过程实现原理无异， 不再赘述。
本发明实施例提供了一种多点协作联合发送网络中的信息反馈方法， 在 本发明的实施例三的基础上， 实现了多终端复用同一资源时的信息反馈， 提 高了频谱复用率。
本发明的实施例还提供了一种终端， 在釆用多点协作技术的网络中， 该 终端的结构如图 3所示， 包括：
长期统计的多小区相关矩阵生成模块 301 , 其设置成根据对各协作小区 下行信道估计的结果， 生成所述终端的长期统计的多小区相关矩阵， 该长期 统计的多小区相关矩阵中包含各协作小区间的相位信息；
反馈模块 302 , 其设置成按照预置的反馈规则， 向所述终端所在协作集 的中心基站发送该长期统计的多小区相关矩阵。
进一步地， 上述终端还包括：
单小区信道方向信息生成模块 303 , 其设置成生成各个协作小区的信道 方向信息；
所述反馈模块 302还设置成向所述中心基站发送各个协作小区的信道方 向信息。
进一步地， 上述终端如图 4所示， 还包括：
瞬时多小区相干矩阵生成模块 304, 其设置成根据下行信道估计的结果， 生成该终端的瞬时相关矩阵；
所述单小区信道方向信息生成模块 303还设置成才艮据所述长期统计的多 小区相关矩阵生成模块 301生成的长期统计的多小区相关矩阵和瞬时多小区 相干矩阵生成模块 304生成的瞬间相关矩阵， 生成各个协作小区的信道方向 信息。
本发明的实施例还提供了一种基站， 其结构如图 5所示， 在釆用多点协 作技术的网络中， 包括：
信息接收模块 501 , 其设置成接收终端的长期统计的多小区相关矩阵， 并存储该长期统计的多小区相关矩阵。
进一步地， 所述信息接收模块 501还设置成接收终端发送的各协作小区 的信道方向信息， 该基站如图 6所示， 还包括：
预编码权值校正模块 502 , 其设置成确定与该终端对应的长期统计的多 小区相关矩阵， 根据该终端对应的长期统计的多小区相关矩阵对所述信道方 向信息进行校正， 获取预编码矢量。
本发明的实施例还提供了一种多点协作联合发送网络中的信息反馈系 统， 在釆用多点协作技术的网络中， 包括终端和中心基站；
所述终端设置成根据对各协作小区下行信道估计的结果， 生成所述终端 的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵中包含各协作 小区间的相位信息， 按照预置的反馈规则， 向所述终端所在协作集的中心基 站发送该长期统计的多小区相关矩阵；
所述中心基站设置成接收终端的长期统计的多小区相关矩阵， 并存储该 长期统计的多小区相关矩阵。
进一步地， 所述终端还设置成生成各个协作小区的信道方向信息， 并向 所述中心基站发送各个协作小区的信道方向信息；
所述中心基站还设置成接收所述终端发送的各协作小区的信道方向信 息， 确定与该终端对应的长期统计的多小区相关矩阵， 并才艮据所述终端对应 的长期统计的多小区相关矩阵对所述信道方向信息进行校正， 获取该终端的 预编码矢量。
上述终端、 基站和多点协作联合发送网络中的信息反馈系统， 可以与本 发明的实施例提供的一种多点协作联合发送网络中的信息反馈方法相结合， 在终端对各协作小区完成下行信道估计后， 根据各协作小区的下行信道估计 结果， 生成终端的长期统计的多小区相关矩阵， 在该长期统计的多小区相关 矩阵中携带各协作小区间的相位信息， 并按照预置的反馈规则， 向所述终端 所在协作集的中心基站发送该长期统计的多小区相关矩阵， 由于各协作小区 间的相位关系是慢变的， 故通过长期统计的多小区相关矩阵反馈相位信息可 以延长反馈相位信息的周期， 从而减少相位信息占用的开销， 解决了终端向 基站反馈多小区相位信息时开销大的问题， 减少了终端上码本的存储量和终 端处理的复杂度。且长期统计的多小区相关矩阵还含有自适应码本校正信息， 减少了反馈量化误差。
本领域普通技术人员可以理解实现上述实施例方法携带的全部或部分步 骤是可以通过程序来指令相关的硬件完成， 所述的程序可以存储于一种计算 机可读存储介质中， 该程序在执行时， 包括方法实施例的步骤之一或其组合。
另外， 在本发明各个实施例中的各功能单元可以釆用硬件的形式实现， 也可以釆用软件功能模块的形式实现。 所述集成的模块如果以软件功能模块 的形式实现并作为独立的产品销售或使用时， 也可以存储在一个计算机可读 取存储介质中。
上述提到的存储介质可以是只读存储器， 磁盘或光盘等。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应以权利要求所述的保护范围为准。
工业实用性
与现有技术相比， 本发明解决了终端向基站反馈多小区相位信息时开销 大的问题， 减少了终端上码本的存储量和终端处理的复杂度， 且长期统计的 多小区相关矩阵还含有自适应码本校正信息， 减少了反馈量化误差。

Claims

权 利 要 求 书
1、 一种多点协作联合发送网络中的信息反馈方法， 包括 ：
终端根据对各协作小区下行信道估计的结果， 生成所述终端的长期统计 的多小区相关矩阵， 所述长期统计的多小区相关矩阵中包含各协作小区间的 相位信息；
所述终端按照预置的反馈规则， 向所述终端所在协作集的中心基站发送 所述长期统计的多小区相关矩阵。
2、根据权利要求 1所述的多点协作联合发送网络中的信息反馈方法， 其 中， 终端根据对各协作小区下行信道估计的结果， 生成所述终端的长期统计 的多小区相关矩阵的步骤为：
所述终端根据表达式 R , 计算并获取该终端的长期统
Figure imgf000018_0001
计的多小区相关矩阵， 其中， R为长期统计的多小区相关矩阵， Γ为长期统计 的时间窗， S为子带内子载波的个数， Hm为协作多小区组合信道矩阵
Hm = [Ηι,Η2,· · ·,ΗΝ_ι,ΗΝ]。
3、根据权利要求 1所述的多点协作联合发送网络中的信息反馈方法， 其 中， 所述终端按照预置的反馈规则， 向所述终端所在协作集的中心基站发送 所述长期统计的多小区相关矩阵的步骤为：
所述终端按照所述中心基站的指示， 向该中心基站发送所述长期统计的 多小区相关矩阵； 或者，
所述终端按照当前的工作状态， 自适应地确定长期统计的多小区相关矩 阵的反馈周期， 按照该反馈周期反馈所述长期统计的多小区相关矩阵。
4、根据权利要求 1所述的多点协作联合发送网络中的信息反馈方法， 还 包括：
所述终端生成各协作小区的信道方向信息；
所述终端实时向所述中心基站发送各协作小区的信道方向信息。
5、根据权利要求 4所述的多点协作联合发送网络中的信息反馈方法， 其 中， 所述终端生成各协作小区的信道方向信息的步骤为：
所述终端通过表达式 = max || H,v ||分别计算各协作小区的信道方向信息， 其中， 为信道方向信息， 为釆用的码本， V为码本中的矢量， 为单小 区信道矩阵。
6、根据权利要求 4所述的多点协作联合发送网络中的信息反馈方法， 其 中， 所述终端生成各协作小区的信道方向信息的步骤包括：
所述终端根据表达式^ =—YHm HHm生成该终端的瞬时相关矩阵，其中，
I ^ I 5
^为该终端的瞬时相关矩阵， S为子带内子载波的个数， ^„1为协作多小区组 合信道矩阵， m '-'u v, 以及 所述终端通过表达式
V = argmin || R, - (R 1/2 *([¼^2,- - -^,]^ *∑1/2 *[¼,^,- - -^,])1/2 || 和 = [Vl'v2'' ' ' ' 分别计算各协作小区的信道方向信息， 其中， 为信道方向信 息， 为釆用的码本， V为码本中的矢量， N为对应于各个小区的码本中的 矢量， ^为所述终端的长期统计的多小区相关矩阵，且^ =丄 丄 H H∞ ,
∑为长期统计的多小区相关矩阵^的特征值对角矩阵。
7、根据权利要求 5或 6所述的多点协作联合发送网络中的信息反馈方法， 其在向所述终端所在协作集的中心基站发送所述长期统计的多小区相关矩阵 的步骤之后还包括：
所述中心基站接收并存储所述终端发送的长期统计的多小区相关矩阵。
8、根据权利要求 7所述的多点协作联合发送网络中的信息反馈方法， 还 包括：
所述中心基站接收所述终端发送的各协作小区的信道方向信息， 确定与 该终端对应的长期统计的多小区相关矩阵；
所述中心基站根据所述终端对应的长期统计的多小区相关矩阵对所述信 道方向信息进行校正， 获取该终端的预编码矢量。
9、根据权利要求 8所述的多点协作联合发送网络中的信息反馈方法， 其 中， 所述中心基站根据所述终端对应的长期统计的多小区相关矩阵对所述信 道方向信息进行校正， 获取该终端的预编码矢量的步骤为：
所
W
Figure imgf000020_0001
进行计算，获取 所述终端对应的预编码适量， 其中， W为预编码矢量， R为长期统计的多小 区相关矩阵， 、 ρ ··· ^为各协作小区的信道方向信息。
10、 一种终端， 其特征在于， 所述终端应用于多点协作联合发送网络中 的信息反馈， 所述终端包括：
长期统计的多小区相关矩阵生成模块， 其设置成根据对各协作小区下行 信道估计的结果， 生成所述终端的长期统计的多小区相关矩阵， 该长期统计 的多小区相关矩阵中包含各协作小区间的相位信息；
反馈模块， 其设置成按照预置的反馈规则， 向所述终端所在协作集的中 心基站发送所述长期统计的多小区相关矩阵。
11、 根据权利要求 10所述的终端， 还包括：
单小区信道方向信息生成模块， 其设置成生成各协作小区的信道方向信
所述反馈模块还设置成向中心基站实时发送各协作小区的信道方向信
12、 一种基站， 其特征在于， 所述基站应用于多点协作联合发送网络中 的信息反馈， 所述基站包括：
信息接收模块， 其设置成接收并存储终端发送的长期统计的多小区相关 矩阵。
13、 根据权利要求 12所述的基站， 其中，
所述信息接收模块还设置成接收终端发送的各协作小区的信道方向信 息；
所述基站还包括： 预编码权值校正模块， 其设置成确定与终端对应的长 期统计的多小区相关矩阵， 才艮据终端对应的长期统计的多小区相关矩阵对终 端发送的信道方向信息进行校正， 获取终端的预编码矢量。
14、 一种多点协作联合发送网络中的信息反馈系统， 包括终端和中心基 站； 其中，
所述终端设置成： 根据对各协作小区下行信道估计的结果， 生成所述终 端的长期统计的多小区相关矩阵， 该长期统计的多小区相关矩阵中包含各协 作小区间的相位信息； 以及， 按照预置的反馈规则， 向所述终端所在协作集 的中心基站发送该长期统计的多小区相关矩阵；
所述中心基站设置成接收并存储所述终端发送的长期统计的多小区相关 矩阵。
15、 根据权利要求 14所述的多点协作联合发送网络中的信息反馈系统， 其中，
所述终端还设置成生成各个协作小区的信道方向信息， 并向所述中心基 站发送各个协作小区的信道方向信息；
所述中心基站还设置成： 接收所述终端发送的各协作小区的信道方向信 息， 确定与所述终端对应的长期统计的多小区相关矩阵， 并才艮据所述终端对 应的长期统计的多小区相关矩阵对所述终端发送的信道方向信息进行校正， 获取所述终端的预编码矢量。
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