WO2016161962A1 - Procédé et appareil de retour d'informations de canal - Google Patents

Procédé et appareil de retour d'informations de canal Download PDF

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Publication number
WO2016161962A1
WO2016161962A1 PCT/CN2016/078799 CN2016078799W WO2016161962A1 WO 2016161962 A1 WO2016161962 A1 WO 2016161962A1 CN 2016078799 W CN2016078799 W CN 2016078799W WO 2016161962 A1 WO2016161962 A1 WO 2016161962A1
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Prior art keywords
precoding matrix
vertical dimension
matrix set
base station
precoding
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PCT/CN2016/078799
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English (en)
Chinese (zh)
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王飞
童辉
王启星
侯雪颖
金婧
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中国移动通信集团公司
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Publication of WO2016161962A1 publication Critical patent/WO2016161962A1/fr

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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

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  • the present disclosure relates to the field of communications technologies, and in particular, to a channel information feedback method and apparatus.
  • the antennas of the base station are generally deployed in a horizontal arrangement, and the number is relatively small.
  • LTE Long Term Evolution
  • the number of base station antenna ports is now 1, 2, 4 or 8.
  • MIMO multiple-input multiple-output
  • a base station can use multiple antenna ports to perform data transmission with a user equipment (User Equipment, UE).
  • UE User Equipment
  • the base station needs to perform downlink data scheduling based on the downlink channel information fed back by the UE. Therefore, the UE needs to perform channel measurement and feed back downlink channel information, including channel indicator (RI) information and codebook index indication (Precoding Matrix Indicator, PMI) information and channel quality indicator (CQI) information; in order to feed back the PMI, the UE needs to know the codebook set including multiple available precoding matrices, and selects in the codebook set according to the result of the channel estimation. The best precoding matrix for system performance.
  • RI channel indicator
  • PMI Precoding Matrix Indicator
  • CQI channel quality indicator
  • the base station can inform the UE of the precoding matrix that can be used by indicating to the UE the number of antenna ports for MIMO transmission.
  • the antenna array will be enhanced from the current one-dimensional antenna array to the two-dimensional antenna array, and the number of antennas of the base station will increase sharply, for example, to 16, 32, 64, 128, or even more.
  • the MIMO based on one-dimensional antenna array evolves into a three-dimensional MIMO (3D-MIMO) method based on two-dimensional antenna array.
  • 3D-MIMO three-dimensional MIMO
  • the measurement and feedback of codebook and channel information in the traditional MIMO scheme will not meet the requirements of 3D-MIMO.
  • a mainstream design codebook is a codebook divided into horizontal and vertical codebook the codebook W H W V, and then synthesized by a Kronecker (Kronecher) calculates the product of the codebook Among them, the horizontal codebook can use the existing codebook based on the one-dimensional horizontal antenna array, but the vertical codebook cannot use the existing codebook.
  • the embodiments of the present disclosure provide a channel information feedback method and apparatus, which are used to solve the problem that the UE cannot obtain the available vertical codebook in the related art, and the downlink channel information cannot be fed back in 3D-MIMO.
  • An embodiment of the present disclosure provides a channel information feedback method, including:
  • the base station sends the configuration information to the UE, where the UE performs downlink channel information feedback based on the configuration information.
  • the determining, by the base station, configuration information of a precoding matrix set of the UE in a vertical dimension including:
  • the base station determines an angular range of a signal direction of the UE in a vertical dimension
  • the base station determines configuration information of the precoding matrix set of the UE in a vertical dimension based on the determined range of angles.
  • the base station determines an angular range of the signal direction of the UE in a vertical dimension, including:
  • the base station determines an angular range of the signal direction of the UE in a vertical dimension based on the determined uplink channel information.
  • the determining, by the base station, configuration information of a precoding matrix set of the UE in a vertical dimension including:
  • the base station determines configuration information of the same precoding matrix set in the vertical dimension for all UEs in the cell.
  • the method further includes:
  • the base station Receiving, by the base station, downlink channel information that is fed back by the UE, where the downlink channel information includes a codebook index indicating PMI of a vertical dimension;
  • the configuration information includes one or more of the following information:
  • the parameter information includes: an oversampling factor ⁇ related to a size range of a signal direction of the UE in a vertical dimension; and/or N v positive integers m, wherein each m value and a signal of the UE The angles have a corresponding relationship in the angle range of the vertical dimension, and each m value is used to determine one precoding matrix in the precoding matrix set, and N v is the number of precoding matrices in the precoding matrix set.
  • the base station determines each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer
  • 0 ⁇ m ⁇ ⁇ N v -1 different precoding matrices in the precoding matrix set correspond to different m.
  • the oversampling is due to Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension.
  • Another embodiment of the present disclosure provides a channel information feedback method, including:
  • the user equipment UE determines a precoding matrix set in a vertical dimension
  • the UE performs downlink channel information feedback based on the precoding matrix set.
  • the UE performs downlink channel information feedback based on the precoding matrix set, including:
  • the UE selects a precoding matrix of a vertical dimension in the precoding matrix set according to the result of performing channel estimation on the base station, and feeds back a codebook index indicating PMI corresponding to the precoding matrix.
  • the UE determines a precoding matrix set in a vertical dimension, including:
  • the UE determines a precoding matrix set in a vertical dimension based on the configuration information.
  • An embodiment of the present disclosure provides a channel information feedback apparatus, including:
  • a determining module configured to determine configuration information of a precoding matrix set of the user equipment UE in a vertical dimension
  • a sending module configured to send the configuration information to the UE, so that the UE performs downlink channel information feedback based on the configuration information.
  • Another embodiment of the present disclosure provides a channel information feedback apparatus, including:
  • a determining module for determining a set of precoding matrices in a vertical dimension
  • a sending module configured to perform downlink channel information feedback based on the precoding matrix set.
  • the base station may determine configuration information of the precoding matrix set of the user equipment UE in the vertical dimension, and send the configuration information to the UE, where the UE may determine a precoding matrix in a vertical dimension based on the configuration information.
  • Set that is, know the precoding matrix available in the vertical dimension, from Downstream channel information feedback in 3D-MIMO can be implemented.
  • FIG. 1 is a flowchart of a channel information feedback method according to some embodiments of the present disclosure
  • FIG. 2 is a flowchart of a channel information feedback method according to some embodiments of the present disclosure
  • FIG. 3 is a flowchart of a channel information feedback method according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic diagram of a UE transmitting an uplink signal
  • FIG. 5 is a flowchart of a channel information feedback method according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram of a UE transmitting an uplink signal
  • FIG. 7 is a schematic structural diagram of a channel information feedback apparatus according to some embodiments of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a channel information feedback apparatus according to some embodiments of the present disclosure.
  • the base station may determine configuration information of the precoding matrix set of the user equipment UE in the vertical dimension, and send the configuration information to the UE, where the UE may determine a precoding matrix in a vertical dimension based on the configuration information.
  • the set that is, the precoding matrix available in the vertical dimension, is known, so that downlink channel information feedback in 3D-MIMO can be implemented.
  • a flowchart of a channel information feedback method includes the following steps:
  • the base station determines configuration information of the precoding matrix set of the user equipment UE in the vertical dimension.
  • the base station sends the configuration information to the UE, where the UE performs downlink channel information feedback based on the configuration information.
  • the method further includes:
  • the base station Receiving, by the base station, downlink channel information that is fed back by the UE, where the downlink channel information includes a codebook index indicating PMI of a vertical dimension;
  • the base station is based on the PMI, and each precoding matrix in the set of precoding matrices Corresponding relationship of PMI, selecting a pre-coding matrix of a vertical dimension for precoding the signal transmitted to the UE.
  • the base station configures a precoding matrix set in the vertical dimension for the UE, and sends configuration information of the precoding matrix set of the vertical dimension to the UE.
  • the UE determines a precoding matrix that is available in the vertical dimension based on the configuration information, and selects a precoding matrix that optimizes system performance according to the result of the channel estimation, and feeds back the PMI of the selected vertical dimension precoding matrix to the downlink channel information.
  • the base station also feeds back the horizontal dimension PMI.
  • the base station may determine, according to the PMI of the vertical dimension fed back by the UE and the PMI of the horizontal dimension, the correspondence between the precoding matrix and the PMI of the pre-stored vertical dimension, and the correspondence between the precoding matrix of the horizontal dimension and the PMI, A precoding matrix of a vertical dimension and a precoding matrix of a horizontal dimension, based on the precoding matrix W V of the vertical dimension and the precoding matrix W H of the horizontal dimension, the composite precoding matrix is determined by Kronecher product A signal transmitted to the UE is precoded based on the synthesized precoding matrix.
  • the base station may determine configuration information of the precoding matrix set of the UE in a vertical dimension for a specific UE, and may also determine configuration information of a precoding matrix set of all UEs in a vertical dimension in the small cell for the entire cell. That is, the base station determines configuration information of the precoding matrix set of the UE in the vertical dimension, including:
  • the base station determines configuration information of the same precoding matrix set in the vertical dimension for all UEs in the cell.
  • the configuration information determined by the different UEs in the cell may be the same or different. If the base station uniformly determines the configuration information for all UEs in the cell, All UEs in the cell use the same configuration information. The configuration information used by UEs in different cells may be the same or different.
  • the base station separately determines the configuration information for each UE in the cell, if different UEs in the same cell feed back the same vertical dimension
  • the PMI of the PMI the precoding matrix indicated by the PMI may be the same or different; if the base station uniformly determines the configuration information for all the UEs in the cell, if the different UEs in the same cell feed back the PMI of the same vertical dimension, the PMI
  • the indicated precoding matrices are the same precoding matrix.
  • the precoding matrices indicated by the PMIs of the same vertical dimension fed back by the UEs of different cells may be the same or different.
  • the determining, by the base station, configuration information of a precoding matrix set of the UE in a vertical dimension including:
  • the base station determines an angular range of a signal direction of the UE in a vertical dimension
  • the base station determines configuration information of the precoding matrix set of the UE in a vertical dimension based on the determined range of angles.
  • the base station and the UE may use a (Discrete Fourier Transform (DFT) codebook or other codebook based on the DFT codebook (such as a linear combination of multiple DFT codebooks) as a vertical dimension in 3D-MIMO.
  • DFT Discrete Fourier Transform
  • codebook based on the DFT codebook (such as a linear combination of multiple DFT codebooks) as a vertical dimension in 3D-MIMO.
  • Codebook Since the distribution of the UE in the vertical dimension is generally limited to a certain range of angles instead of 360 degrees, when determining the configuration information of the precoding matrix set of the vertical dimension for the UE, it is necessary to consider the signal direction of the UE in the vertical dimension. The range of angles.
  • the base station determines an angular range of the signal direction of the UE in a vertical dimension, including:
  • the base station determines an angular range of the signal direction of the UE in a vertical dimension based on the determined uplink channel information.
  • the UE sends an uplink SRS
  • the base station uses the SRS to estimate the uplink channel information of the UE, and uses the uplink channel information to determine the distribution of the angle at which the UE sends the uplink signal.
  • the oversampling factor of the modified DFT codebook style may be first determined based on the range of angles, where Where ⁇ is an angular range of the signal direction of the UE in the vertical dimension; when the base station specifically determines the configuration information for the specific UE, ⁇ is an angular range of the signal transmitted by the UE, when the base station determines the configuration information for the entire cell , ⁇ is the total angular range in which signals are transmitted by all UEs in the cell.
  • the oversampling factor to be determined, the number of antennas in the vertical dimension of the base station The number of precoding matrices N v in the precoding matrix set and the positive integer m (0 ⁇ m ⁇ ⁇ N v -1) corresponding to the precoding matrix are substituted into the following formula:
  • m has a value of N v , corresponding to a precoding matrix of N v vertical dimensions.
  • the UE sent by the base station may include one or more of the following information in the configuration information of the precoding matrix set of the vertical dimension:
  • the parameter information includes: an oversampling factor ⁇ related to a size range of a signal direction of the UE in a vertical dimension; and/or N v positive integers m, wherein each m value and a signal of the UE The angles have a corresponding relationship in the angle range of the vertical dimension, and each m value is used to determine one precoding matrix in the precoding matrix set, and N v is the number of precoding matrices in the precoding matrix set.
  • the configuration information sent by the base station to the UE may include a precoding matrix set directly indicated to the UE, and may also include parameter information for determining the precoding matrix set, for example, the reference information may include an oversampling factor. And/or a set of m values including N v kinds of m values, where m is a positive integer in the interval [0, ⁇ N v -1], the value of which is related to the determined angle of the signal direction of the UE, for example, the UE When the signal direction is 0 degrees in the vertical dimension, the corresponding m value is 0.
  • the precoding matrix number N v and the like in the precoding matrix set may be indicated by the configuration information, or may be indicated by the base station to the UE by other information, or may be pre-agreed.
  • the base station since the UE needs to feed back the PMI of the vertical dimension to the base station, the base station needs to determine the precoding matrix of the vertical dimension based on the PMI. Therefore, the UE and the base station need to have the correspondence between the PMI of the vertical dimension and the precoding matrix.
  • the base station may indicate the corresponding relationship to the UE through the configuration information, or may not indicate to the UE, and the UE determines the PMI corresponding to the precoding matrix of the vertical dimension according to a pre-agreed manner, for example, the UE is based on being small to large. After the m values are sequentially determined for each precoding matrix, each precoding matrix is sequentially numbered from 0 to N v -1 in the order of the corresponding m values from small to large, that is, the PMI corresponding to each precoding matrix.
  • the above-mentioned channel information feedback method is further introduced by the UE side of the user equipment, and the specific implementation is not repeated here.
  • a flowchart of a channel information feedback method includes the following steps:
  • S201 The UE determines a precoding matrix set in a vertical dimension
  • S202 The UE performs downlink channel information feedback based on the precoding matrix set.
  • the UE performs downlink channel information feedback based on the precoding matrix set, including:
  • the UE selects a precoding matrix of a vertical dimension in the precoding matrix set according to the result of performing channel estimation on the base station, and feeds back a codebook index indicating PMI corresponding to the precoding matrix.
  • the UE selects a precoding matrix of a vertical dimension that optimizes system performance in a precoding matrix set according to the result of performing channel estimation on the base station, and feeds back the codebook index indicating PMI corresponding to the precoding matrix.
  • the UE determines a precoding matrix set in a vertical dimension, including:
  • the UE receives configuration information of a precoding matrix set of the UE in a vertical dimension sent by the base station; and determines a precoding matrix set in a vertical dimension based on the configuration information.
  • the precoding matrix set may be pre-agreed by the base station and the UE, or may be determined by the UE based on pre-agreed parameter information for determining a precoding matrix set.
  • the precoding matrix set may be sent by the base station to the UE by using configuration information.
  • the method before the receiving, by the UE, the configuration information sent by the base station, the method further includes:
  • the UE sends a sounding reference signal SRS for the base station to determine an angular range of the signal direction of the UE in a vertical dimension, and determines configuration information of the precoding matrix set of the UE in a vertical dimension based on the angular range.
  • the configuration information includes one or more of the following information:
  • the parameter information includes: an oversampling factor ⁇ related to a size range of a signal direction of the UE in a vertical dimension; and/or N v positive integers m, wherein each m value and a signal of the UE The angles have a corresponding relationship in the angle range of the vertical dimension, and each m value is used to determine one precoding matrix in the precoding matrix set, and N v is the number of precoding matrices in the precoding matrix set.
  • the UE determines a precoding matrix set in a vertical dimension, including:
  • the UE determines a precoding matrix set in a vertical dimension according to preset parameter information used to determine a precoding matrix set.
  • the UE determines each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer
  • 0 ⁇ m ⁇ ⁇ N v -1 different precoding matrices in the precoding matrix set correspond to different m.
  • the oversampling factor Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension.
  • the base station separately determines configuration information for the precoding matrix set in the vertical dimension for each UE within the cell.
  • a flowchart of a channel information feedback method includes the following steps:
  • the base station determines, according to the sounding reference signal SRS sent by the UE, the uplink channel information of the UE, and determines, according to the determined uplink channel information, an angular range of the direction in which the UE sends the signal in a vertical dimension.
  • the base station configures the precoding matrix set of the UE in the vertical dimension according to the direction of the direction in which the UE sends the signal in the vertical dimension, and sends the configuration information of the precoding matrix set to the UE.
  • S303 The any UE determines a precoding matrix set in a vertical dimension based on the configuration information.
  • S304 The UE selects a precoding matrix of a vertical dimension in the determined precoding matrix set of the vertical dimension based on a result of performing channel estimation on the base station.
  • S305 The UE feeds back downlink channel information to the base station, where the codebook index corresponding to the selected precoding matrix of the vertical dimension indicates the PMI.
  • the base station selects, according to the PMI, a stored correspondence between a precoding matrix and a PMI of a vertical dimension of the UE, from the determined precoding matrix set, to perform a signal sent to the any UE.
  • the base station and the UE determine each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension, Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer, and 0 ⁇ m ⁇ N v -1, and different precoding matrices in the precoding matrix set correspond to different m.
  • the UEs in the cell 1 covered by the base station 1 include UF1, UE2, and UE3, and the UEs in the cell 2 include UE4, UE5, and UE6, and the base station 1 determines the direction in which the signals sent by UF1, UE2, and UE3 are in the vertical dimension.
  • the angular range is [ ⁇ 1 L , ⁇ 1 H ] (angle range size is ⁇ 1 ), [ ⁇ 2 L , ⁇ 2 H ] (angle range size is ⁇ 2 ), and [ ⁇ 3 L , ⁇ 3 H ] (the angular range size is ⁇ 3 ); based on the obtained angular range, the base station 1 determines that the oversampling factors of the vertical dimension precoding matrices used by UF1, UE2, and UE3 are respectively Similarly, the oversampling factors of the precoding matrix of the vertical dimension used by the base station 2 to obtain the UE4, the UE5, and the UE6 are respectively
  • Base station 1 or base station 2 determines N v m values corresponding to N v vertical dimension precoding matrices for UEi (i ⁇ 1 ⁇ 6), here denoted mi:
  • ⁇ i is an oversampling factor corresponding to UEi.
  • the above ⁇ i , mi , and the number of antennas in the vertical dimension of the base station The above ⁇ i , mi , and the number of antennas in the vertical dimension of the base station
  • the number of precoding matrices N v in the precoding matrix set is substituted into the above precoding matrix for determining UEi
  • the formula is to get the UEi precoding matrix set.
  • the base station uniformly determines configuration information of the precoding matrix set in the vertical dimension for all UEs in the cell.
  • a flowchart of a channel information feedback method includes the following steps:
  • the base station determines, according to the sounding reference signal SRS sent by multiple UEs in the cell, uplink channel information of each UE, and determines, according to the determined uplink channel information of each UE, a total direction of the signal sent by multiple UEs in a vertical dimension. Angle range.
  • the base station may calculate, for all UEs currently accessing the base station, a total range of angles in which the directions of the signals transmitted by all the UEs are in the vertical dimension, or may select only a plurality of UEs, and calculate the selected multiple UEs to send signals.
  • the total angular extent of the direction in the vertical dimension may be calculated, for all UEs currently accessing the base station, a total range of angles in which the directions of the signals transmitted by all the UEs are in the vertical dimension, or may select only a plurality of UEs, and calculate the selected multiple UEs to send signals.
  • the total angular extent of the direction in the vertical dimension may be calculated, for all UEs currently accessing the base station, a total range of angles in which the directions of the signals transmitted by all the UEs are in the vertical dimension, or may select only a plurality of UEs, and calculate the selected multiple UEs to send signals. The total angular extent of the direction in the vertical dimension.
  • the base station determines, according to the determined total range of the range, a precoding matrix set of the UE in the vertical dimension in the cell, and sends configuration information of the precoding matrix set to the UE in the cell.
  • Any UE in the cell determines a precoding matrix set in a vertical dimension based on the configuration information.
  • the UE selects a precoding matrix of a vertical dimension in the determined precoding matrix set of the vertical dimension based on a result of performing channel estimation on the base station.
  • S505 The UE forwards the downlink channel information to the base station, where the codebook index corresponding to the selected precoding matrix of the vertical dimension indicates the PMI.
  • the base station selects, according to the PMI, a stored correspondence between a precoding matrix and a PMI of a vertical dimension of the entire cell, and selects, from the determined precoding matrix set, a signal sent to the any UE.
  • the base station and the UE determine each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension, Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer, and 0 ⁇ m ⁇ N v -1, and different precoding matrices in the precoding matrix set correspond to different m.
  • the UEs in the cell 1 covered by the base station 1 include UF1, UE2, UE3, and UE4, and the UEs in the cell 2 include UE5, UE6, UE7, and UE8, and the base station 1 determines that UF1, UE2, UE3, and UE4 transmit
  • multiple direction angles of the signal sent by the UE may be detected, an angular range of the signal sent by the UE may be determined, and then a total range of angles including an angular range of signals transmitted by each UE in the cell may be determined.
  • the base station 1 determines that the oversampling factor of the vertical dimension precoding matrix used by all UEs in the cell 1 is Similarly, the base station 2 determines that the oversampling factor of the vertical dimension precoding matrix used by all UEs in the cell 2 is
  • the base station 1 determines N v m values corresponding to N v vertical dimensional precoding matrices for the UEs in the cell 1, here denoted as m1, m 1 ⁇ ⁇ 1 N v - M 1 , ⁇ 1 N v - M 1 +1,..., ⁇ 1 N v -1,0,1,2,...,N v -M 1 -1 ⁇ , ⁇ 1 is an oversampling factor corresponding to cell 1.
  • the base station 2 determines N v m values corresponding to N v vertical dimensional precoding matrices for the UEs in the cell 2, here denoted m2, m 2 ⁇ ⁇ 2 N v - M 2 , ⁇ 2 N v - M 2 +1,..., ⁇ 2 N v -1,0,1,2,...,N v -M 2 -1 ⁇ , ⁇ 2 is an oversampling factor corresponding to cell 2.
  • the number of antennas in the vertical dimension of ⁇ 1 , m1 and base station 1 described above The number of precoding matrices N v in the precoding matrix set is substituted into the above determined precoding matrix
  • the formula, that is, the precoding matrix set of the cell 1 is obtained; the number of antennas of the above ⁇ 2 , m 2 , and the base station 2 in the vertical dimension is obtained.
  • the number of precoding matrices N v in the precoding matrix set is substituted into the above determined precoding matrix
  • the formula, that is, the precoding matrix set of the cell 2 is obtained.
  • a channel information feedback device corresponding to the channel information feedback method is also provided in the embodiment of the present disclosure, and the channel information of the embodiment of the present disclosure is The feedback method is similar, so the implementation of the device can be referred to the implementation of the method, and the repeated description will not be repeated.
  • FIG. 7 is a schematic structural diagram of a channel information feedback apparatus according to some embodiments of the present disclosure, including:
  • a determining module 71 configured to determine configuration information of a precoding matrix set of the user equipment UE in a vertical dimension
  • the sending module 72 is configured to send the configuration information to the UE, so that the UE performs downlink channel information feedback based on the configuration information.
  • the determining module 71 is specifically configured to:
  • the determining module 71 is specifically configured to:
  • the determining module 71 is specifically configured to:
  • the configuration information of the same precoding matrix set in the vertical dimension is determined for all UEs in the cell.
  • the device further includes:
  • the receiving module 73 is configured to: after the transmitting module 72 sends the configuration information to the UE, receive downlink channel information that is fed back by the UE, where the downlink channel information includes a codebook index indication PMI of a vertical dimension;
  • a selecting module 74 configured to: according to the PMI, and a correspondence between each precoding matrix and the PMI in the precoding matrix set, select a vertical dimension used to precode the signal sent to the UE Precoding matrix.
  • the configuration information includes one or more of the following information:
  • the parameter information includes: an oversampling factor ⁇ related to a size range of a signal direction of the UE in a vertical dimension; and/or N v positive integers m, wherein each m value and a signal of the UE The angles have a corresponding relationship in the angle range of the vertical dimension, and each m value is used to determine one precoding matrix in the precoding matrix set, and N v is the number of precoding matrices in the precoding matrix set.
  • the determining module 71 is specifically configured to determine each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer
  • 0 ⁇ m ⁇ ⁇ N v -1 different precoding matrices in the precoding matrix set correspond to different m.
  • the oversampling is due to Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension.
  • FIG. 8 is a schematic structural diagram of a channel information feedback apparatus according to some embodiments of the present disclosure, including:
  • a determining module 81 configured to determine a precoding matrix set in a vertical dimension
  • the sending module 82 is configured to perform downlink channel information feedback based on the precoding matrix set.
  • the sending module 82 is specifically configured to:
  • the determining module 81 is specifically configured to:
  • the sending module 82 is further configured to:
  • the configuration information includes one or more of the following information:
  • the parameter information includes: an oversampling factor ⁇ related to a size range of a signal direction of the UE in a vertical dimension; and/or N v positive integers m, wherein each m value and a signal of the UE The angles have a corresponding relationship in the angle range of the vertical dimension, and each m value is used to determine one precoding matrix in the precoding matrix set, and N v is the number of precoding matrices in the precoding matrix set.
  • the determining module 81 is specifically configured to:
  • the determining module 81 is specifically configured to determine each precoding matrix in the precoding matrix set according to the following formula:
  • N v is the number of precoding matrices in the precoding matrix set
  • ⁇ is the oversampling factor ⁇ related to the angular extent of the signal direction of the UE in the vertical dimension
  • m is a positive integer
  • 0 ⁇ m ⁇ ⁇ N v -1 different precoding matrices in the precoding matrix set correspond to different m.
  • the oversampling factor Where ⁇ is the angular extent of the signal direction of the UE in the vertical dimension.
  • embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware aspects. Moreover, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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

Abstract

L'invention porte sur un procédé et un appareil de retour d'informations de canal. Selon le procédé de retour d'informations de canal, une station de base détermine des informations de configuration d'un ensemble de matrices de précodage d'un UE dans la dimension verticale, et envoie ces informations de configuration à l'UE, de sorte que l'UE met en œuvre, sur la base des informations de configuration, un retour d'informations de canal de liaison descendante. L'UE détermine, sur la base des informations de configuration, un ensemble de matrices de précodage de dimension verticale, c'est-à-dire qu'il acquiert une matrice de précodage utilisable dans la dimension verticale, et il rend ainsi possible la prise en charge du retour d'informations de canal de liaison descendante en MIMO 3D.
PCT/CN2016/078799 2015-04-08 2016-04-08 Procédé et appareil de retour d'informations de canal WO2016161962A1 (fr)

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WO2014142504A1 (fr) * 2013-03-11 2014-09-18 엘지전자 주식회사 Procédé et appareil de rapport d'informations d'état de canal dans un système de communication sans fil
WO2015021596A1 (fr) * 2013-08-13 2015-02-19 Nec(China) Co., Ltd. Procédés et appareils pour estimation de canal et retour d'informations dans un système entrée multiple sortie multiple tridimensionnel
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