WO2019191932A1 - 上行天线的选择方法和装置 - Google Patents

上行天线的选择方法和装置 Download PDF

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Publication number
WO2019191932A1
WO2019191932A1 PCT/CN2018/081884 CN2018081884W WO2019191932A1 WO 2019191932 A1 WO2019191932 A1 WO 2019191932A1 CN 2018081884 W CN2018081884 W CN 2018081884W WO 2019191932 A1 WO2019191932 A1 WO 2019191932A1
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WO
WIPO (PCT)
Prior art keywords
codebook
communication device
precoding matrix
target
antenna
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PCT/CN2018/081884
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English (en)
French (fr)
Inventor
祝慧颖
纪刘榴
窦圣跃
李元杰
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18913971.0A priority Critical patent/EP3758246A4/en
Priority to PCT/CN2018/081884 priority patent/WO2019191932A1/zh
Priority to CN201880091380.0A priority patent/CN111886809B/zh
Publication of WO2019191932A1 publication Critical patent/WO2019191932A1/zh
Priority to US17/033,119 priority patent/US11303332B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • 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
    • H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
    • 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
    • H04B7/0602—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 antenna switching
    • H04B7/0608—Antenna selection according to transmission parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0628—Diversity capabilities
    • 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
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas

Definitions

  • the embodiments of the present application relate to communication engineering technologies, and in particular, to a method and an apparatus for selecting an uplink antenna.
  • the UE configures fewer antenna radio frequency circuits, and usually the channel of the transmitting antenna is smaller than the channel of the receiving antenna.
  • the physical uplink shared channel (PUSCH) uplink antenna selection technique refers to that the UE selects at least one physical antenna from among multiple physical antennas to transmit uplink data.
  • the number of transmit antenna channels and receive antenna channels is different due to different UE capabilities (UE transmit and receive can share the same physical antenna);
  • the UE supports one transmit antenna channel and two receive antenna channels (that is, 1T2R).
  • Some UEs support one transmit antenna channel and four receive antenna channels (that is, 1T4R), and some UEs support two transmit antenna channels.
  • 4 receiving antenna channels that is, 2T4R
  • other UEs support 1 transmit antenna channel, 8 receive antenna channels (that is, 1T8R), and so on.
  • the existing protocol in LTE only supports the selection of the uplink antenna in the case of the 1T2R.
  • the UE receives the downlink control information (Downlink Control Information, DCI) format 0 according to the latest reception.
  • the signaling to the uplink is performed on the PUSCH; or, when the UE has multiple serving base stations, the UE is configured according to the physical downlink control channel (Physical Downlink Control Channel, PDCCH)/enhanced physical downlink control channel (The Enhanced Physical Downlink Control Channel (EPDCCH) is the same antenna port indicated by the subframe given in DCI format 0, and determines the antenna corresponding to the PUSCH.
  • PDCCH Physical Downlink Control Channel
  • EPDCCH Enhanced Physical Downlink Control Channel
  • An embodiment of the present application provides a method and an apparatus for selecting an uplink antenna, so that a communication device under various antenna capabilities can implement a physical antenna for selecting uplink information from among multiple physical antennas.
  • an embodiment of the present application provides a method for selecting an uplink antenna, including:
  • the first target codebook Determining, according to the number of layers and the number of physical antennas of the communication device, the first target codebook, where the first target codebook includes a plurality of first precoding matrices;
  • the solution determines the first target codebook according to the number of physical antennas of the layer number communication device of the uplink transmission sent by the network device, and the precoding matrix corresponding to the index in the first target codebook according to the index sent by the network device
  • the precoding matrix may indicate a physical antenna for transmitting uplink information, so that the terminal devices under various antenna capabilities may implement a physical antenna that selects one of the plurality of physical antennas for transmitting uplink information.
  • the row of the first precoding matrix is in one-to-one correspondence with the physical antenna of the communication device, and the physical antenna corresponding to the row including the non-zero element in the first precoding matrix is used for transmitting the uplink information.
  • a normalization coefficient of the first precoding matrix is a reciprocal of a square root of a sum of squares of non-zero elements in the first precoding matrix
  • This feature can ensure that the sum of the energy allocated by the physical antennas for transmitting the uplink information is 1, instead of all the antennas, so as to ensure the effective transmission of the uplink information.
  • the first precoding matrix satisfies a preset condition, and the preset condition is Or the preset condition is
  • W is the first precoding matrix
  • W T is a conjugate transposed matrix of the first precoding matrix
  • This feature can eliminate interference between channels as much as possible.
  • the first target codebook has the following possible forms:
  • the first form is: when the number of layers is 1 and the number of physical antennas of the communication device is 4, the first target codebook includes:
  • the second form is: when the number of layers is 2 and the number of physical antennas of the communication device is 4, the first target codebook includes:
  • the third form is: when the number of layers is 1 and the number of physical antennas of the communication device is 4, the first target codebook includes:
  • the fourth form is: when the number of layers is 2 and the number of physical antennas of the communication device is 4, the first target codebook includes:
  • the method further includes:
  • antenna capability report information is used to indicate an antenna capability of the communication device, and the antenna capability of the communication device includes:
  • the communication device supports closed loop antenna selection; or
  • the number of physical antennas included in the communication device or
  • the number of physical antennas supported by the communication device for simultaneous uplink transmission is the number of physical antennas supported by the communication device for simultaneous uplink transmission.
  • the first target codebook is a subset of the first codebook
  • the method further includes:
  • the antenna capability of the communication device includes:
  • the communication device supports closed loop antenna selection; or
  • the number of physical antennas included in the communication device or
  • the number of physical antennas supported by the communication device for simultaneous uplink transmission is the number of physical antennas supported by the communication device for simultaneous uplink transmission.
  • the solution for acquiring the first target codebook does not require the communication device to interact with the network device, thereby saving overhead.
  • the first target codebook is a subset of the first codebook
  • the method further includes:
  • the first indication information is used to indicate a precoding matrix used to acquire the first target codebook in the first codebook;
  • the first indication information is used to indicate a precoding matrix that is not used to acquire the first target codebook in the first codebook;
  • the first indication information is used to indicate a precoding matrix group used to acquire the first target codebook in the first codebook, where the precoding matrix group includes the first codebook used to acquire a a precoding matrix of the first target codebook;
  • the first indication information is used to indicate a precoding matrix group that is not used to acquire the first target codebook in the first codebook, where the precoding matrix group includes not used in the first codebook.
  • the first target codebook is a subset of the first codebook
  • the receiving an index of the precoding matrix from the network device includes: receiving downlink control information DCI from the network device, where the DCI includes an index of the precoding matrix;
  • Determining the first target codebook according to the number of layers and the number of physical antennas included in the communication device includes:
  • the first target codebook includes a first precoding matrix group and a second precoding matrix group, if the time domain occupied by the DCI When the number is an odd number, the first pre-compilation matrix group is used to acquire the first target codebook, or if the time domain number occupied by the DCI is an even number, the second precoding matrix group is used. Obtaining the first target codebook.
  • the first target codebook is a subset of the first codebook
  • the receiving an index of the precoding matrix from the network device includes: receiving downlink control information DCI from the network device, where the DCI includes an index of the precoding matrix;
  • Determining the first target codebook according to the number of layers and the number of physical antennas included in the communication device includes:
  • the first target codebook includes a first precoding matrix group and a second precoding matrix group
  • the first precoding matrix group is used to acquire the first target codebook
  • the second precoding matrix group is used to acquire the The first target codebook
  • the communication device supports:
  • an embodiment of the present application provides a method for selecting an uplink antenna, including:
  • the solution determines the number of layers of the uplink transmission and the first target precoding matrix by using the network device, and sends the number of layers of the uplink transmission and the index of the first target precoding matrix in the first target codebook to the communication device to enable communication. Determining, by the device according to the number of layers and the index, a first target precoding matrix, and determining, according to the physical antenna for transmitting uplink information indicated by the first precoding matrix, a physical antenna for transmitting uplink information, thereby enabling each The terminal device under the antenna capability can realize the physical antenna selected from the plurality of physical antennas for transmitting the uplink information.
  • the first target codebook includes a plurality of first precoding matrices, and the first precoding matrix has the following characteristics:
  • a row of the first precoding matrix is in one-to-one correspondence with a physical antenna of the communication device
  • the physical antenna corresponding to the row including the non-zero element in the first precoding matrix is a physical antenna for transmitting uplink information.
  • the number of columns of the first precoding matrix is the same as the number of layers.
  • the normalization coefficient of the first precoding matrix is a reciprocal of the square root of the sum of the squares of the non-zero elements in the first precoding matrix.
  • the first precoding matrix satisfies a preset condition, and the preset condition is Or the preset condition is
  • W is the first precoding matrix
  • W T is a conjugate transposed matrix of the first precoding matrix
  • the form of the first object codebook and the form of the first object codebook in the first aspect are the same because the codebooks stored on the network device side and the communication device side are the same.
  • the determining the number of physical antennas of the communication device includes:
  • the antenna capability reporting information is used to indicate an antenna capability of the communication device, and the antenna capability of the communication device includes: a number of physical antennas of the communication device.
  • the determining the first target precoding matrix according to the number of layers of the uplink transmission and the number of physical antennas of the communication device including:
  • the first target codebook is a subset of the first codebook
  • Determining the first target precoding matrix according to the number of layers of the uplink transmission and the number of physical antennas included in the communication device including:
  • the antenna capability of the communication device includes:
  • the communication device supports closed loop antenna selection; or
  • the number of physical antennas included in the communication device or
  • the number of physical antennas supported by the communication device for simultaneous uplink transmission is the number of physical antennas supported by the communication device for simultaneous uplink transmission.
  • the number of physical antennas supported by the communication device for simultaneous uplink transmission is the number of physical antennas supported by the communication device for simultaneous uplink transmission.
  • the first indication information is sent to the communication device
  • the first indication information is used to indicate a precoding matrix used to acquire the first target codebook in the first codebook;
  • the first indication information is used to indicate a precoding matrix that is not used to acquire the first target codebook in the first codebook;
  • the first indication information is used to indicate a precoding matrix group used to acquire the first target codebook in the first codebook, where the precoding matrix group includes the first codebook used to acquire a a precoding matrix of the first target codebook;
  • the first codebook is not used to obtain a precoding matrix group of the first target codebook, and the precoding matrix group includes precoding that is not used to obtain the first target codebook in the first codebook. matrix.
  • the first codebook includes a first precoding matrix group and a second precoding matrix group
  • the sending to the communications apparatus, the index of the number of layers and the first target precoding matrix in the first target codebook, including :
  • the sending to the communications apparatus, the index of the number of layers and the first target precoding matrix in the first target codebook, including :
  • Downlink control information DCI is transmitted to the communication device in an odd-numbered time domain, the DCI including the number of layers and the index, and the second precoding matrix group corresponds to an odd time domain.
  • the first codebook includes a first precoding matrix group and a second precoding matrix group
  • the sending to the communications apparatus, the index of the number of layers and the first target precoding matrix in the first target codebook, including :
  • the DCI includes the number of layers and the index
  • the mask of the DCI is a first CRC mask, and the first precoding matrix group and the first Corresponding to the CRC mask;
  • the DCI is sent to the communication device, the DCI includes the number of layers and the index, and the mask of the DCI is second. a CRC mask, the second precoding matrix group corresponding to the second CRC mask.
  • an embodiment of the present application provides a communications apparatus, including a processor
  • the processor is operative to couple with a memory to read and execute instructions in the memory to implement the method of uplink antenna selection referred to in the first aspect.
  • the memory is also included.
  • an embodiment of the present application provides a communications apparatus, including a processor
  • the processor is operative to couple with a memory to read and execute instructions in the memory to implement the method of uplink antenna selection referred to in the second aspect.
  • the memory is also included.
  • an embodiment of the present application provides a computer storage medium, including instructions, when the instruction is run on a communication device, causing the communication device to perform a method of uplink antenna selection involved in the first aspect.
  • an embodiment of the present application provides a computer storage medium, including instructions, when the instruction is run on a communication device, causing the communication device to perform a method of uplink antenna selection involved in the second aspect.
  • At least part of the precoding matrix of the codebook may indicate a physical antenna of the communication device, and the network device acquires a target precoding matrix according to the antenna capability and/or uplink channel information supported by the communication device, and the target precoding matrix is obtained.
  • the index indication is sent to the communication device, and the communication device determines, according to the index, the index corresponding target precoding matrix from the codebook stored by the terminal side, and the target precoding matrix determined by the network device is the same as the target precoding matrix determined by the terminal device.
  • the physical antenna indicated by the target precoding matrix is the target physical antenna used by the determined communication device to transmit uplink information, and the selection of the uplink antenna of multiple communication devices supporting different antenna capabilities is realized; and, if the target precoding matrix is used It is determined by the network device according to the uplink channel information, which ensures that the communication device uses the target physical antenna to transmit uplink information, and the system has the best performance, that is, the communication device can select the target physical antenna with the best system performance to send the uplink information.
  • FIG. 1 is a system architecture diagram of an embodiment of the present application
  • FIG. 2 is a signaling flowchart 1 of a method for selecting an uplink antenna according to an embodiment of the present application
  • FIG. 3 is a signaling flowchart 2 of a method for selecting an uplink antenna according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram 1 of a communication device provided by the present application.
  • FIG. 5 is a schematic structural diagram 2 of a communication device provided by the present application.
  • a communication device comprising: a terminal device, which may also be called a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, User terminal, terminal, wireless communication device, user agent or user device.
  • a terminal device which may also be called a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, User terminal, terminal, wireless communication device, user agent or user device.
  • UE user equipment
  • the communication device may be a station (ST) in a wireless local area network (WLAN), and may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, or a wireless local loop (wireless local Loop, WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, and next-generation communication system, For example, a communication device in a fifth-generation (5G) network or a communication device in a publicly evolved public land mobile network (PLMN) network, a new radio (NR) communication system Communication device, etc.
  • 5G fifth-generation
  • PLMN publicly evolved public land mobile network
  • NR new radio
  • the communication device may also be a wearable device.
  • a wearable device which can also be called a wearable smart device, is a general term for applying wearable technology to intelligently design and wear wearable devices such as glasses, gloves, watches, clothing, and shoes.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are more than just a hardware device, but they also implement powerful functions through software support, data interaction, and cloud interaction.
  • Generalized wearable smart devices include full-featured, large-size, non-reliable smartphones for full or partial functions, such as smart watches or smart glasses, and focus on only one type of application, and need to work with other devices such as smartphones. Use, such as various smart bracelets for smart signs monitoring, smart jewelry, etc.
  • the communication device may also include a drone, such as an onboard communication device on the drone.
  • the network device may be a device for communicating with the mobile device, and the network device may be an access point (AP) in the WLAN, a base transceiver station (BTS) in GSM or CDMA, or may be A base station (nodeB, NB) in WCDMA may also be an evolved base station (evolutional node B, eNB or eNodeB) in LTE, or a relay station or an access point, or an in-vehicle device, a wearable device, and a network in a future 5G network.
  • evolutional node B, eNB or eNodeB evolved base station
  • gNodeB new generation node B
  • the network device provides a service for the cell, and the communication device communicates with the network device by using a transmission resource (for example, a frequency domain resource, or a spectrum resource) used by the cell, where the cell may be a network device.
  • a transmission resource for example, a frequency domain resource, or a spectrum resource
  • the cell may be a network device.
  • the cell may belong to a macro base station, or may belong to a base station corresponding to a small cell, where the small cell may include: a metro cell, a micro cell, and a pico cell. (pico cell), femto cell, etc.
  • pico cell pico cell
  • femto cell etc.
  • Upstream channel matrix h mn is the impulse response of the subchannel between the mth antenna of the receiving end and the nth antenna of the transmitting end.
  • the transmitting end is a communication device
  • the receiving end is a network device
  • the impulse response is a network.
  • the device obtains the sounding reference signal (SRS) transmitted by the corresponding antenna at the transmitting end.
  • SRS sounding reference signal
  • Open-loop antenna selection and closed-loop antenna selection a. Open-loop antenna selection: The PUSCH alternately transmits between multiple antennas of the communication device, or the uplink data is alternately transmitted between the antennas, and avoids fast fading of a single channel. b. Closed-loop antenna selection: The communication device must transmit reference signals from different antennas for base station to perform channel quality measurement, and then select antennas with good channel quality for data transmission.
  • the antenna port includes an antenna port for carrying an uplink data transmission channel (referred to as an uplink data channel, such as a PUSCH), and is used for carrying a demodulated reference signal (referred to as a demodulation reference signal, such as a demodulation reference signal (referred to as a demodulation reference signal (referred to as a demodulation reference signal (referred to as a demodulation reference signal (referred to as a demodulation reference signal (referred to as a demodulation reference signal (DMRS) is used to carry the reference signal of the channel sounding (referred to as the antenna port of the channel sounding reference signal, such as SRS), that is, the antenna port refers to the specific physical channel and/or Or the antenna port of the physical signal.
  • DMRS demodulation reference signal
  • the channels corresponding to the paths they experience in the spatial transmission may be regarded as the same or related (such as large-scale channel characteristics).
  • the channel matrix is the same); that is, the signal transmitted by the same antenna port can be considered as the same or related channel when demodulating, that is, the antenna port is a logical meaning, and the signal receiving end usually passes through the antenna.
  • the port identifies signals with different transmission channels.
  • Physical antenna It can also be called a user antenna or a user antenna port or a user port. It can also be called a transmitting antenna or a receiving antenna. The physical antenna can have a corresponding relationship with the feeding port of the antenna.
  • a physical antenna refers to an array of physical antennas.
  • the physical antenna is also identified by a port, but the port here is different from the antenna port used to carry the physical channel in 5.
  • the transmit antenna is a physical meaning. It can be associated with the antenna port or not.
  • the different physical antennas can be distinguished by different identifiers or indexes.
  • mapping relationship between an antenna port and a physical antenna is an implementation problem.
  • One or more physical antennas can be weighted to form one antenna port.
  • the mapping between the antenna port and the transmitting antenna element unit of the user may also be a problem for the user.
  • the user may number the transmitting antenna element unit and map the antenna port to the transmitting antenna element unit.
  • the antenna port is a logical concept. It has no one-to-one correspondence with the physical antenna. It can be mapped one by one with the physical antenna. It can map one antenna port to multiple physical antennas. Multiple antenna ports are mapped to one physical antenna. During the transmission process, the uplink data is mapped to the antenna port corresponding to the physical antenna through the physical antenna for uplink data transmission.
  • FIG. 1 is a schematic structural diagram of a system provided by an embodiment of the present application.
  • the architecture includes a communication device 10 and a network device 20.
  • the communication device 10 can be, for example, a UE, and the network device 20 can be a base station.
  • the process of transmitting data to the terminal by the base station is downlink transmission, and the terminal transmits data to the base station.
  • the process is uplink transmission.
  • the network device 20 determines the number of layers of the uplink transmission and the second target precoding matrix, and sends the number of layers of the uplink transmission and the index of the second target precoding matrix in the second target codebook to the communication device 10, where
  • the second target codebook is determined by the network device 20 according to the number of layers of the uplink transmission and the number of physical antennas that the communication device has.
  • the communication device 10 determines the first target codebook according to the number of layers of the uplink transmission and the number of physical antennas of the communication device, and determines the precoding matrix indicated by the index in the first target codebook as the first target precoding matrix. Determining a target physical antenna for transmitting uplink information according to the physical antenna indicated by the first target precoding matrix.
  • the physical antenna indicated by the first target precoding matrix for the data encoding determined by the communication device is a selected physical antenna for transmitting uplink information.
  • the selection of the uplink antenna of the communication device supporting different antenna capabilities is realized.
  • FIG. 2 is a signaling flowchart 1 of a method for selecting an uplink antenna according to an embodiment of the present disclosure. Referring to FIG. 2, the method in this embodiment includes:
  • Step S201 The communication device sends an SRS to the network device.
  • Step S202 The communication device sends uplink antenna capability information to the network device, where the uplink antenna capability information is used to indicate the antenna capability of the communication device; the antenna capability of the communication device includes the number of physical antennas included in the communication device; or the simultaneous use of the communication device The number of physical antennas transmitted in the uplink; or the physical antenna supported by the communication device for uplink transmission;
  • Step S203 The network device determines uplink channel information according to the SRS, and determines the number of layers of the uplink transmission according to the uplink channel information.
  • Step S204 The network device determines, according to the number of layers of the uplink transmission and the number of physical antennas included in the communication device, the second target codebook, and determines, according to the antenna capability of the communication device, or the uplink channel information, from the second target codebook. a second target precoding matrix;
  • Step S205 The network device sends, to the communication device, an index of the second target precoding matrix in the second target codebook and a number of layers of the uplink transmission.
  • Step S206 The communication device determines, according to the number of layers of the uplink transmission and the number of physical antennas of the communication device, the first target codebook, the first target codebook and the second target codebook are the same, and the first target codebook includes multiple a precoding matrix;
  • Step S207 Determine, according to the first target precoding matrix corresponding to the index in the plurality of first precoding matrices, a target physical antenna used by the communications apparatus to send uplink information; the first target precoding matrix and the second target precoding matrix are the same. .
  • each physical antenna of the communication device sends an SRS to the network device, and the network device determines uplink channel information according to the SRS, and determines the number of layers for uplink transmission according to the uplink channel information.
  • the number of layers of the uplink transmission refers to the number of data streams that can be independently transmitted in parallel.
  • the uplink channel information refers to information related to the quality of the uplink channel, such as an uplink channel matrix, that is, the network device can obtain an uplink channel matrix according to the SRS, and the rank of the uplink channel matrix is the number of layers of the uplink transmission.
  • the method for obtaining the uplink channel matrix refer to the existing method, and details are not described in this embodiment.
  • the communication device also sends uplink antenna capability information to the network device, where the antenna capability reporting information is used to indicate the antenna capability of the communication device, and the antenna capability includes:
  • the communication device supports closed loop antenna selection; or,
  • the antenna capability of the communication device may be (1), or (2), or (3), or (4), either (1) and (2), or (3) or (4), or (1) and (3), or (1) and (4), or (2) And (4), or (2) and (3), or (1) and (2) and (3), or (1) and (2) and (4), or (2) and ( 3) and (4), or (1) and (3) and (4), or (1) and (2) and (3) and (4), that is, the antenna capability of the communication device may be medium (1) ), (2), (3), (4) any one of the corresponding capabilities or any two corresponding capabilities or optionally three corresponding capabilities or all of the capabilities.
  • the antenna capability includes at least the communication device supporting closed loop antenna selection and the number of physical antennas included in the communication device.
  • the number of physical antennas included in the communication device if the communication device supports 1T4R, the number of physical antennas included in the communication device is 4, and if the communication device supports 2T8R, the number of physical antennas included in the communication device is 8.
  • the number of physical antennas supported by the communication device for uplink transmission where "simultaneously” refers to "the same time", then the number of physical antennas simultaneously used for uplink transmission, that is, the communication device can The number of physical antennas that transmit uplink information at the same time. If the communication device supports 1T4R, the number of physical antennas used for uplink transmission is 1. If the communication device supports 2T4R, the number of physical antennas used for uplink transmission is 2 .
  • the antenna capability report information may include indication information of an index of the physical antenna group to save information bit overhead, and the physical antenna group includes at least one physical antenna, and the specific description is as follows:
  • the method for grouping all possible physical antennas of the communication device may be predefined by the communication device or based on signaling indication, and the signaling may be high layer signaling, such as radio resource control (Radio Resource Control, referred to as RRC). Signaling or media access control control element (MAC CE) signaling, etc., may also be physical layer signaling, such as DCI signaling.
  • RRC Radio Resource Control
  • MAC CE media access control control element
  • the index of the physical antenna is 0, 1, 2, and 3, respectively.
  • the physical antenna is divided into 4 groups, and each group of one antenna is in the antenna capability reporting information, and the 2-bit information indicates different.
  • the physical antenna for example, can be indexed with "00", that is, the physical antenna indicating that the index is 0.
  • the index 1 can be indicated by "01”, that is, the physical antenna indicating the index is 1, and the index 2 can be indicated by "10". That is, the physical antenna indicating the index is 2, and the index 3 can be indicated by "11", that is, the physical antenna indicating the index is 3.
  • the communication device supports 2T4R.
  • the four physical antennas can be divided into six groups according to different combinations, each group includes two physical antennas, and the index of the group composed of the physical antenna 0 and the physical antenna 2 can be 0.
  • the index of the group consisting of the physical antenna 1 and the physical antenna 3 may be 1, and the index of the group consisting of the physical antenna 0 and the physical antenna 1 may be 2, and the index indicating the group consisting of the physical antenna 2 and the physical antenna 3 may be 3.
  • the index of the group consisting of the physical antenna 1 and the physical antenna 2 may be 4, and the index of the group consisting of the physical antenna 0 and the physical antenna 3 may be 5; the index of the different physical antenna groups may be indicated by 3-bit information, and -000 may be used.
  • ⁇ indicates index 0, that is, a group indicating the composition of physical antenna 0 and physical antenna 2 (which can be expressed as (0, 2)); index 1 can be indicated by "001", that is, the composition of physical antenna 1 and physical antenna 3 is indicated.
  • the group (which can be expressed as (1,3)), can be indexed 2 with ⁇ 010 ⁇ , that is, the group indicating the composition of physical antenna 0 and physical antenna 1 (can be expressed as (0, 1)), available ⁇ 011 ⁇ Indicates index 3, that is, a group indicating the composition of the physical antenna 2 and the physical antenna 3 ( Expressed as (2,3)), index can be indicated by "100", that is, a group indicating the composition of physical antenna 1 and physical antenna 2 (which can be expressed as (1, 2)), and index 5 can be indicated by "101". That is, a group indicating the composition of the physical antenna 0 and the physical antenna 3 (which can be expressed as (0, 3)).
  • the physical antenna group in the communication device cannot be used to transmit uplink information, that is, if the antenna capacity supported by the communication device is 1T4R, the physical antenna group composed of the physical antenna numbered 3 It may not be used to send the above information because of hardware limitations. For example, if the antenna capacity supported by the communication device is 2T4R, the physical antenna group consisting of the physical antenna numbered 0 and the physical antenna numbered 1 may be located due to the RF chain. The limit cannot be used to send the above information.
  • the antenna capability reporting information may directly include indication information of an index of a physical antenna that is simultaneously supported by the communication device for uplink transmission, or indication information that the communication device does not support an index of a physical antenna that is simultaneously used for uplink transmission.
  • the physical antenna for simultaneous uplink transmission refers to the above-described physical antenna group.
  • the antenna capability report information may include indication information of the index of the physical antenna group, for example, physical antenna group (0, 2), physical antenna group (0, 3) physical due to hardware limitations of the terminal.
  • Antenna group (1, 2) The physical antenna group (1, 3) is a physical antenna that is supported by the communication device and used for uplink transmission.
  • the antenna capability report information can directly include the physical antenna group (0, 2) and the physical antenna.
  • the network device determines, according to the number of physical antennas supported by the communication device and supported by the communication device, and the indication information of the index of the physical antenna group for uplink transmission supported by the communication device.
  • the physical antenna supported by the communication device for uplink transmission, or the number of physical antennas used by the network device for uplink transmission supported by the communication device indicated in the antenna capability report information, and the communication device does not support the physical for simultaneous uplink transmission.
  • the indication information of the index of the antenna group determines that the communication device does not support the physical antenna for simultaneous uplink transmission, and further determines the physical antenna supported by the communication device for uplink transmission.
  • the antenna capability reporting information includes indication information of an index of at least part of the physical antenna included in the communication device, and the network device supports the physical antenna for uplink transmission supported by the communication device indicated by the antenna capability reporting information.
  • the number of physical antennas indicated in the antenna capability reporting information is combined to obtain a physical antenna for uplink transmission supported by the communication device, or the physical device for uplink transmission supported by the communication device indicated by the antenna capability reporting information.
  • the number of antennas is combined with the physical antenna indicated in the antenna capability reporting information to obtain a physical antenna that is not supported by the communication device for uplink transmission, and further determines a physical antenna that is supported by the communication device and used for uplink transmission.
  • the antenna capability report information includes the index information of the physical antenna, such as the indication information including the index of the physical antenna 0, the indication information of the index of the physical antenna 2, and the indication information of the index of the physical antenna 3.
  • the device determines the physical antenna supported by the communication device for uplink transmission according to the number 2 of physical antennas supported by the communication device supported by the communication device indicated in the antenna capability reporting information: physical antenna 0, or physical antenna 2, or , physical antenna 3, or physical antenna 0 and physical antenna 3, or physical antenna 0 and physical antenna 2, or physical antenna 2 and physical antenna 3.
  • the number of physical antennas supported by the communication device for uplink transmission is 2, it is also possible to use only one physical antenna for uplink transmission. Therefore, physical antenna 0 or physical antenna 2 appears, or Determination of physical antenna 3.
  • the physical antenna supported by the communication device for uplink transmission is the same as the number of physical antennas supported by the communication device supported by the communication device indicated in the antenna capability report information and supported by the communication device. Determined by the indication information of the physical antenna group or the index of the physical antenna group transmitted in the uplink.
  • the network device can know the number of physical antennas included in the communication device, or the physical antenna supported by the communication device for uplink transmission.
  • step S204 after the network device determines the number of layers of the uplink transmission and the antenna capability of the communication device, the precoding matrix for the uplink information coding can be determined.
  • the codebook according to the embodiment of the present application is first introduced.
  • the number of layers of each uplink transmission corresponds to a plurality of codebooks, and each of the plurality of codebooks corresponding to the same layer number corresponds to an antenna capability supported by the communication device.
  • the following describes a partial codebook corresponding to a communication device having N physical antennas.
  • At least part of the precoding matrix (referred to as a first precoding matrix) in the codebook satisfies the following rule: the first precoding matrix satisfies a preset condition , the default condition is Or, the default condition is Where W is the first precoding matrix, and W T is a conjugate transposed matrix of the first precoding matrix, For the diagonal matrix, For the diagonal matrix.
  • the first precoding matrix has the following features:
  • the physical antennas are physical antenna 0, physical antenna 1, physical antenna 2, and physical antenna 3.
  • the first row can correspond to the physical antenna 0, the second row can correspond to the physical antenna 1, and the third row can correspond to the physical antenna 2, and the fourth row. It can correspond to the physical antenna 3.
  • the impulse response of the corresponding column in the uplink channel matrix is obtained according to which physical antenna transmits the SRS.
  • the physical antenna corresponding to the row including the non-zero element in the first precoding matrix is a physical antenna for transmitting uplink information; for example, the first precoding matrix is As described in (1), the communication device corresponding to the first precoding matrix has four physical antennas, and the number of layers for uplink transmission is 1. As described in (2), the first row can correspond to the physical antenna 0, because the first The first row of all precoding matrices including non-zero elements, the physical antenna indicated by the first precoding matrix is physical antenna 0.
  • the first precoding matrix As described in (1), the communication device corresponding to the first precoding matrix has four physical antennas, and the number of layers for uplink transmission is two. As described in (2), the second row can correspond to the physical antenna 1, and the fourth row. Corresponding to the physical antenna 3, since all of the first precoding matrix including the non-zero element behaves the second row and the fourth row, the physical antenna indicated by the first precoding matrix is the physical antenna 1 and the physical antenna 3.
  • the number of columns of the first precoding matrix is the same as the number of layers transmitted in the uplink;
  • the codebook corresponding to the uplink transmission can be as shown in Table 1:
  • All the precoding matrices in the codebook shown in Table 1 are the first precoding matrices that meet the above conditions.
  • the first column in Table 1 is the index of the precoding matrix, and the index corresponding to the first precoding matrix in the same row is increased from left to right, for example.
  • the index is 0,
  • the index is 1, and so on.
  • the codebook in Table 1 is based on all the physical antennas included in the communication device to divide the power. However, in reality, not all antennas transmit uplink information at the same time. The equal power of all physical antennas may cause the power of the antenna that actually transmits the uplink information to be low. Not conducive to the effective transmission of uplink information.
  • the first precoding matrix can satisfy the following conditions:
  • the normalization coefficient of the first precoding matrix is the reciprocal of the square root of the sum of the squares of the non-zero elements in the first precoding matrix.
  • the codebook corresponding to the uplink transmission may also be as shown in Table 3:
  • the precoding matrices corresponding to the indexes 16 to 43 in the codebook shown in Table 3 are all the first precoding matrices that meet the above conditions, and the precoding matrices corresponding to the indexes 0 to 15 are precoding matrices in the prior art.
  • the index corresponding to the first precoding matrix in the same row increases from left to right, for example The index is 24, The index is 25, and so on.
  • the codebook corresponding to the uplink transmission may be as shown in Table 4 or Table 5:
  • All the precoding matrices in the codebook shown in Table 4 are the first precoding matrices that satisfy the conditions (1) to (6).
  • the index corresponding to the first precoding matrix in the same row increases from left to right, for example The index is 0, The index is 1, and so on.
  • the precoding matrices corresponding to the indexes 16 to 33 in the codebook shown in Table 5 are all the first precoding matrices corresponding to the conditions (1) to (6), and the precoding matrices corresponding to the indexes 0 to 15 are existing.
  • the precoding matrix in the technique that is to say the codebook shown in Table 5, is a plurality of first precoding matrices which are added to the prior art codebook in accordance with the above conditions. Referring to Table 5, the index corresponding to the first precoding matrix in the same row increases from left to right, for example The index is 16, The index is 17, and so on.
  • the number of physical antennas included in the communication device is 8, and the number of layers for uplink transmission is 1, the first precoding matrix in the corresponding codebook has 8 rows, and the number of columns is 1 column. If the number of physical antennas of the communication device is 2, and the number of layers for uplink transmission is 1, the first coding matrix in the corresponding codebook has 2 rows, and the number of columns is 1 column. That is to say, the number of layers of the same uplink transmission corresponds to a plurality of different codebooks according to the difference in the number of physical antennas included in the terminal.
  • each of the foregoing codebooks is stored in the communication device and the network device, and the codebook corresponding to the same number of layers and the same physical antenna only stores one form, for example, if the communication device and the network device The codebook stored in the side is the codebook shown in Table 2, then the codebook shown in Table 3 is not stored. If the codebook stored on the communication device and the network device side is the codebook as shown in Table 3, then The codebook shown in Table 2 will not be stored.
  • each precoding matrix corresponds to one index
  • the respective indexes of the precoding matrices in the above table are exemplary examples, and are not limited to the indexes in the foregoing tables
  • the respective indices of the precoding matrices included may be defined by a standard or may be determined by negotiation between the communication device and the network device.
  • the first precoding matrix described above can implement the role of indicating a physical antenna of the communication device.
  • the first precoding matrix described above has the function of indicating the physical antenna of the terminal, and can also function as a function of eliminating interference between channels in the precoding matrix in the prior art.
  • Equation 1 The calculation method of the signal vector from the receiving end is as shown in Equation 1:
  • r, H, s, and n represent the received signal vector, the channel matrix, the transmitted signal vector, and the additive noise vector, respectively.
  • the channel matrix is a diagonal matrix, for example
  • the received signal vector of the transmitted signal passing through the channel to the receiving end is A first antenna receiving end the received signals r 1 does not include a second antenna signal x 2 transmitted via the signal channels 12 h, the receiving end of the second antenna received signal does not include a first transmission antenna
  • the signal x 1 passes through the signal after channel h 21 , ie, inter-channel interference or inter-signal interference is eliminated, but the MIMO channel matrix does not have the characteristics of a diagonal matrix.
  • SVD Singular Value Decomposition
  • the conjugate transposed matrix V H of V, the pre-coded signal passes through the channel, and the signal received by the receiving end
  • the receiving end transposes the conjugate of the received signal to the left ⁇ array U, that is, It is equivalent to multiplying the transmitted signal by the diagonal matrix. Therefore, the pre-coded signal is equivalent to a set of data
  • the ideal precoding matrix is the conjugate transposed matrix V H of the right singular matrix V of the channel matrix, but due to the large amount of data of the complete and accurate channel information, the network device will notify the communication device of the uplink channel and will occupy a large amount of downlink. Resources, so in order to reduce the overhead, the codebook-based precoding technology compresses and quantizes various forms of V, and obtains each precoding matrix in the prior art, for example, indexes 0 to 15 in Table 3 indicate each.
  • the precoding matrix, the precoding matrix coefficients indicated by the indexes 16 to 23 are changed to 1/2 each precoding matrix, and the precoding matrix indicated by 0 to 15 in Table 5.
  • the precoding matrix in the prior art also satisfies the condition that the conjugate transposed matrix of the precoding matrix is multiplied by the precoding matrix to obtain a diagonal matrix.
  • the first precoding matrix of the present embodiment may indicate a physical antenna, and the reason for eliminating interference between channels will be described.
  • the precoding matrix that can indicate the physical antenna in the implementation of the present application is to set the non-zero elements of some rows in each precoding matrix in the prior art to 0, so that the elements of some rows All are 0 elements to achieve the function of indicating the physical antenna. If the channel matrix is multiplied by the precoding matrix W 1 in the prior art, and then multiplied by a conjugate transposed matrix of the left singular matrix U, the receiving end is equivalent to transmitting the signal directly when calculating the received signal at the receiving end.
  • Multiplying the first diagonal matrix that is, the signal precoded by the precoding matrix W 1 can be equivalent to a set of data without interference between the spatial channels; then, according to the principle of matrix multiplication, The non-zero elements of some rows in each precoding matrix in the prior art are set to 0, so that the elements of some rows are all 0 elements, and the first precoding matrix W 1 that can indicate the physical antenna also satisfies the following condition: The matrix is multiplied by the first precoding matrix W 2 and then multiplied by a conjugate transposed matrix of a left singular matrix U, so that the receiving end is equivalent to transmitting the signal directly to the second diagonal matrix when calculating the received signal at the receiving end. multiplication, i.e. by signal precoding matrix W 2 after the pre-coding can be experienced in the equivalent spatial channels to a set of data with each other without interference. Only the above-mentioned second diagonal array must have 0 elements.
  • the ideal precoding matrix (the conjugate transposed matrix V H of the right singular matrix V of the channel matrix) does not exist, and the existing precoding matrix after compression quantization can only be
  • the non-zero elements of some rows in the precoding matrix in the prior art are set to 0, so that the elements of some rows are all 0 elements and the first pre-obtained
  • the conjugate transposed matrix and the channel matrix of the left-side left singular matrix U are left, and the effect of eliminating interference between channels is the same as that of the existing precoding matrix.
  • the first implementation manner is: acquiring a first codebook corresponding to the number of layers of the uplink transmission and the number of physical antennas included in the communication device, that is, the codebook originally stored on the network device side, and determining The first codebook is the second target codebook.
  • the network device learns that the communication device has four physical antennas, and selects and transmits the number of layers 1 and corresponds to the communication device having four physical antennas.
  • the codebook is used as the second target codebook.
  • the second target codebook may be the codebook shown in Table 2; if the number of layers of the uplink transmission is 2, and the antenna capability is reported, the network device learns the communication.
  • the device has four antennas, and the codebook corresponding to the number of layers transmitted in the uplink is 2 and the communication device has four physical antennas as the second target codebook.
  • the second target codebook may be the above table 4. The codebook shown.
  • the second implementation manner is: acquiring a first codebook that is stored by the network device and corresponding to the number of layers of the uplink transmission and the number of physical antennas included in the communication device; that is, the codebook originally stored on the network device side; The device acquires the second target codebook according to the antenna capability of the communication device, or the uplink channel information, and the first codebook.
  • the second target codebook is a subset of the first codebook.
  • the network device according to the antenna capability of the communication device, or the uplink channel information can be understood as: (1) the network device only according to the antenna capability of the communication device, (2) the network device only according to the uplink channel information, and (3) the network device according to the communication The antenna capability and upstream channel information of the device.
  • the network device acquires multiple second precoding matrices constituting the second target codebook in the first codebook according to the antenna capability of the communication device or the uplink channel information (that is, does not limit the precoding selected by the communication device). a matrix); acquiring a second target codebook according to the plurality of second precoding matrices.
  • the obtaining the second target codebook herein can be understood as: extracting a plurality of second precoding matrices in the first codebook, and regaining a second target codebook that is reduced relative to the first codebook (at this time,
  • the index of the second precoding matrix in the first codebook may not be the same as the index of the second precoding matrix in the second codebook).
  • the obtaining the second target codebook herein may also be understood as: marking the plurality of second precoding matrices in the first codebook as not restricting the selection of the communication device, or selecting a plurality of second pre-preparations in the first codebook.
  • the precoding matrix other than the coding matrix is marked as a restriction communication device selection, which is equivalent to obtaining a codebook having a restriction communication device selection flag or a communication device selection flag (in this case, the second precoding matrix is in the first codebook)
  • the index is the same as the index of the second precoding matrix in the second target codebook).
  • the method of acquiring the second target codebook has the following five achievable modes as shown in a to e.
  • a network device determines, according to the number of physical antennas supported by the communication device for uplink transmission, a plurality of second precoding matrices that are not restricted by the terminal in the first codebook, specifically: the number that can be indicated
  • the plurality of first precoding matrices of the physical antenna are determined as a plurality of second precoding matrices. It can be understood that the antenna capability indicated in the antenna capability reporting information corresponding to the method further includes at least the number of physical antennas supported by the communication device for uplink transmission.
  • the first codebook is the codebook shown in Table 3 above, and the network device knows that the number of physical antennas supported by the communication device for uplink transmission is 1 according to the antenna capability report information, and the code shown in Table 3 above.
  • Precoding matrix Include a non-zero element in the line, indicating 1 physical antenna, respectively Determined as a plurality of second precoding matrices.
  • the second target codebook can be as shown in Table 6:
  • the precoding matrices indicated by indexes 0 to 15 in the original first codebook shown in Table 3 are all existing precoding matrices, which cannot indicate antennas, and the precoding matrices indicated by indexes 16 to 23 and 28 to 43 are both Two physical antennas may be indicated. Therefore, the precoding matrices indicated by indexes 0 to 15, 16 to 23, and 28 to 43 are all precoding matrices that limit terminal selection, and may be referred to as a third precoding matrix.
  • the index of the second precoding matrix in the codebook shown in Table 6 in the codebook shown in Table 3 is different from the index of the codebook shown in Table 6.
  • the second target codebook shown in Table 6 is in the form of a retrieved reduced codebook.
  • the second target codebook may not be in the form shown in Table 6, for example, it may still be a table.
  • the method of determining the second target codebook by the method is relatively simple.
  • the network device determines, according to the number of physical antennas and uplink channel information used for uplink transmission supported by the communication device, the plurality of second precoding matrices that are not limited by the terminal in the first codebook. It can be understood that the antenna capability indicated in the antenna capability reporting information corresponding to the method further includes at least the number of physical antennas supported by the communication device for uplink transmission and the number of physical antennas of the communication device.
  • the first codebook is the codebook shown in Table 2 above, and the network device learns that the number of physical antennas used for uplink transmission supported by the communication device is 1, according to the antenna capability report information, and the code shown in Table 3 above.
  • Precoding matrix Included in the line is a non-zero element, indicating 1 physical antenna; however, based on previous experience, the network device knows The system performance of the obtained equivalent channel is not good, for example, the system capacity is lower than the first preset threshold and/or the SINR is lower than the second preset threshold. Removed, get Is a plurality of second precoding matrices.
  • the second target codebook can be as shown in Table 7:
  • the precoding matrices indicated by indexes 0 to 15 in the original first codebook shown in Table 3 are all existing precoding matrices, which cannot indicate antennas, and the precoding matrices indicated by indexes 16 to 23 and 28 to 43 are both Two physical antennas may be indicated, and the system performance of the equivalent channel obtained according to the precoding matrix indicated by the index 25 is not good. Therefore, the precoding matrices indicated by indexes 0 to 15, 16 to 23, 25, and 28 to 43 are all restricted.
  • the precoding matrix selected by the terminal may be referred to as a third precoding matrix. As can be seen from Table 7, the index of the second precoding matrix in the codebook shown in Table 7 in the codebook shown in Table 3 is different from the index of the codebook shown in Table 7.
  • the second target codebook shown in Table 7 is in the form of a retrieved reduced codebook.
  • the second target codebook may not be in the form shown in Table 7, for example, it may still be a table.
  • the method for determining the second target codebook can achieve the purpose of selecting the target physical antenna with better system performance to send uplink information.
  • the network device determines, according to the physical antenna supported by the communication device for the uplink transmission, the plurality of second precoding matrices that are not limited by the terminal in the first codebook, specifically: the uplink supported by the communication device is used for uplink A plurality of precoding matrices of the transmitted physical antenna are determined as a plurality of second precoding matrices.
  • the antenna capability indicated in the antenna capability reporting information corresponding to the method further includes at least the number of physical antennas supported by the communication device and the physical antenna communication device for uplink transmission and the uplink supported by the communication device.
  • the physical antenna of the physical antenna communication device is not limited by the terminal in the first codebook
  • the first codebook is the codebook shown in Table 3 above, and the network device learns according to the antenna capability report information that the communication device can simultaneously transmit uplink information through physical antenna 0 and physical antenna 2, and physical antenna 1 and physical antenna 3 simultaneously transmit uplink.
  • the second target codebook can be as shown in Table 8:
  • the second target codebook shown in Table 8 is in the form of the retrieved reduced codebook.
  • the second target codebook may not be in the form shown in Table 8, for example, it may still be a table.
  • the precoding matrix indicated by indexes 0 to 15, 24 to 31, and 32 to 35 has a flag for restricting the selection of the communication device, or the precoding matrix indicated by the indexes 16 to 23 and 36 to 43 has no limitation.
  • the method of determining the second target codebook by the method is relatively simple.
  • the network device determines, according to the physical antenna and the uplink channel information used for the uplink transmission supported by the communication device, the plurality of second precoding matrices that are not limited by the terminal in the first codebook. It can be understood that the antenna capability indicated in the antenna capability reporting information corresponding to the method further includes at least the number of physical antennas supported by the communication device and the physical antenna communication device for uplink transmission and the uplink supported by the communication device. The physical antenna of the physical antenna communication device.
  • the first codebook is the codebook shown in Table 3 above, and the network device learns according to the antenna capability report information that the communication device can simultaneously transmit uplink information through physical antenna 0 and physical antenna 2, and physical antenna 1 and physical antenna 3 simultaneously transmit uplink.
  • the obtained equivalent channel (the equivalent channel is obtained by multiplying the uplink channel matrix by the precoding matrix) has poor system performance, such as the system capacity is lower than the first preset threshold and/or the SINR is lower than the second preset threshold.
  • the second target codebook can be as shown in Table 9:
  • the second target codebook shown in Table 9 is in the form of a retrieved reduced codebook.
  • the second target codebook may not be in the form shown in Table 9, for example, it may still be a table.
  • the matrix has indicia that do not limit the choice of communication device.
  • the method for determining the second target codebook can achieve the purpose of selecting the target physical antenna with better system performance to send uplink information.
  • the network device determines, according to the uplink channel information, a plurality of second precoding matrices that are not restricted by the terminal in the first codebook.
  • the network device knows that the system performance of the equivalent channel obtained according to the precoding matrix indicated by indexes 3 to 5 and 9 to 17 is not good, such as system capacity. If the first preset threshold is lower than the first preset threshold and/or the SINR is lower than the second preset threshold, the precoding matrix indicated by the codebooks 3 to 5 and 9 to 17 shown in Table 4 is used as the third and third selected by the communication device.
  • the precoding matrix, the precoding matrix of 0 to 2, 6 to 8 is a plurality of second precoding matrices that do not limit the selection of the communication device, and the precoding matrix corresponding to the index 0 to 2 and 6 to 8 in Table 4 is obtained.
  • the second target codebook is shown in Table 10:
  • the second target codebook shown in Table 10 is in the form of the retrieved reduced codebook.
  • the second target codebook may not be in the form shown in Table 10, for example, it may still be a table.
  • the precoding matrix indicated by indexes 3 to 5 and 9 to 17 has a flag for restricting the selection of the communication device, or the precoding matrix indicated by indexes 0 to 2 and 6 to 8 has no restriction on the selection of the communication device. mark.
  • the second target codebook is a reduced codebook
  • the number of indexes is small, and when the index of the second target precoding matrix is subsequently indicated to the communication device, the occupied bits are small, thereby saving network overhead.
  • the second target codebook shown in Table 6 is a reduced codebook having only indexes 0 to 3, so that when the index of the second target precoding matrix is subsequently indicated to the communication device, only 2 bits are occupied.
  • the codebook shown in the original table 3 needs to occupy 6 bits when subsequently indicating the index of the second target precoding matrix to the communication device, so that saving the second target precoding matrix to the communication device can be saved.
  • the network overhead of the index of the second target codebook is a reduced codebook
  • the method for determining the second target codebook can achieve the purpose of selecting the target physical antenna with better system performance to send uplink information.
  • the network device acquires the second target precoding matrix from the second target codebook according to the antenna capability of the communication device or the uplink channel information.
  • the network device can be understood as: (1) the network device is only based on the antenna capability of the communication device, and (2) the network device is only based on the uplink channel information, (3) The network device is based on the antenna capabilities and upstream channel information of the communication device.
  • the method of the second target precoding matrix can adopt the following five implementable implementation manners:
  • the first implementation manner is that the network device determines the second target from the plurality of first precoding matrices included in the second target codebook according to the number of physical antennas simultaneously supported by the learned communication device for uplink transmission.
  • the precoding matrix is specifically: the network device selects one of a plurality of precoding matrices capable of indicating the number of physical antennas according to the number of physical antennas supported by the communication device for uplink transmission, as the second target precoding matrix. .
  • the second target codebook is the codebook shown in Table 2 above, and the network device learns that the number of physical antennas for uplink transmission is 1 according to the antenna capability report information, and the code shown in Table 2 above.
  • Precoding matrix Include a row of non-zero elements, respectively indicating 1 physical antenna, then Any one of them is selected as the second target precoding matrix, for example, the first precoding matrix is selected. Then the first precoding matrix That is, the second target precoding matrix.
  • the process of determining the second target precoding matrix is simple.
  • the second implementation manner is that the network device is configured from the plurality of first precoding matrices included in the second target codebook according to the number of physical antennas and the uplink channel information used for the uplink transmission supported by the learned communication device. Determining, by the network device, a plurality of fourth precodings capable of indicating the number of physical antennas from the second target codebook according to the number of physical antennas simultaneously supported by the communication device for uplink transmission The matrix determines a second target precoding matrix from the plurality of fourth precoding matrices according to the uplink channel information.
  • the second target codebook is the codebook shown in Table 2 above, and the network device learns that the number of physical antennas that the communication device can simultaneously send uplink information according to the antenna capability report information is 1, and the codebook shown in Table 2 above.
  • Medium precoding matrix include a line of non-zero elements that indicate 1 physical antenna, respectively a plurality of fourth precoding matrices; and then, according to the uplink channel information, the uplink channel matrix and Multiplying separately to obtain four equivalent channels, and which equivalent channel matrix corresponds to the best system performance, then the precoding matrix corresponding to the equivalent channel matrix is the second target precoding matrix; wherein system performance includes system capacity Signal to Inference plus Noise Ratio (SINR).
  • SINR System capacity Signal to Inference plus Noise Ratio
  • the second target is determined according to the uplink channel information.
  • the precoding matrix that is, multiplying each preselected precoding matrix by the uplink channel matrix to obtain an equivalent channel matrix, and which equivalent channel matrix corresponds to the best system performance, the precoding matrix corresponding to the equivalent channel matrix This is the second target precoding matrix.
  • the physical response of each row corresponds to which physical antenna, and the impulse response of the corresponding column in the uplink channel matrix is obtained based on which physical antenna transmits the SRS. It can be seen that the second target precoding matrix and the uplink channel matrix are known.
  • the equivalent channel matrix is the channel corresponding to the physical antenna indicated by the second target precoding matrix, and then using the second target precoding matrix to indicate that the target physical antenna transmits the uplink information can make the system performance the best, that is, can be implemented. Select the destination physical antenna that makes the system performance better to send uplink information.
  • a third implementation manner is that the network device determines the second target precoding from the plurality of first precoding matrices included in the second target codebook according to the physical antenna supported by the learned communication device for uplink transmission.
  • a matrix specifically: the network device selects, according to a physical antenna that can be used to send uplink information, a precoding matrix from a plurality of precoding matrices indicating a physical antenna that can be used for transmitting uplink information, as the second target precoding matrix.
  • the second target codebook is the codebook shown in Table 2 above, and the network device learns that the physical antenna supported by the communication device and is used for uplink transmission according to the antenna capability report information is physical antenna 0 or physical antenna 1 or physical antenna 2 or
  • the physical antenna 3 can select one physical antenna from the physical antenna 0, the physical antenna 1, the physical antenna 2, and the physical antenna 3 to transmit uplink information, where the codebook shown in Table 2 is as described above.
  • Can indicate physical antenna 0, Can indicate physical antenna 1, Can indicate physical antenna 2
  • the physical antenna 3 can be indicated, and the network device can be from the first precoding matrix Any one of them is selected as the second target precoding matrix, for example, the first precoding matrix is selected. Then the first precoding matrix That is, the second target precoding matrix.
  • the process of determining the second target precoding matrix is simple.
  • the network device determines the second target precoding from the plurality of first precoding matrices included in the second target codebook according to the physical antenna and the uplink channel information used for the uplink transmission supported by the communication device. matrix.
  • the second target codebook may be the codebook shown in Table 2 above, and the network device learns that the physical antenna that the communication device can use to send the uplink information according to the antenna capability report information is: a combination of the physical antenna 0 and the physical antenna 2 (0, 2) The combination of the physical antenna 1 and the physical antenna 3 (1, 3), the physical antenna 0 and the physical antenna 2 can be used to simultaneously transmit uplink information, and the physical antenna 1 and the physical antenna 3 can simultaneously transmit uplink information.
  • the codebook shown in Table 2 above A combination of physical antenna 0 and physical antenna 2 may be indicated; The combination of the physical antenna 1 and the physical antenna 3 may be indicated; and then, according to the uplink channel information, from the first precoding matrix One of the two is selected as the second target precoding matrix.
  • the specific method is: the network device multiplies the uplink channel matrix by the eight first precoding matrices respectively to obtain eight equivalent channel matrices, and which equivalent channel matrix corresponds to system performance.
  • the first precoding matrix corresponding to the equivalent channel matrix is a second target precoding matrix; wherein the system performance includes a system capacity, a Signal to Inference plus Noise Ratio (SINR), and the like. If the first precoding matrix Multiplying with the uplink channel matrix, the obtained equivalent channel matrix corresponds to the best system performance, then the first precoding matrix That is, the second target precoding matrix.
  • the network device may be based on previous experience, such as according to the above eight first precoding matrices.
  • the system performance of the equivalent channel obtained by the precoding matrix is relatively poor. For example, if the system capacity is lower than the first preset threshold and/or the SINR is lower than the second preset threshold, the uplink channel matrix only needs to be separated from the remaining 6 pre-preparations. Coding matrix Perform multiplication to obtain a second target precoding matrix.
  • the network device determines, according to the uplink channel information, the second target precoding matrix from the plurality of first precoding matrices included in the second target codebook.
  • the specific implementation of determining the second target precoding matrix from the second target codebook according to the uplink channel information may be as follows:
  • the network device root multiplies the uplink channel matrix by the 18 first precoding matrices in Table 3 to obtain 18 equivalent channel matrices, and which equivalent channel matrix corresponds to the best system performance, and the equivalent channel matrix corresponds to
  • the first precoding matrix is the second target precoding matrix; wherein the system performance includes system capacity, SINR, and the like. If the first precoding matrix Multiplying with the uplink channel matrix, the obtained equivalent channel matrix corresponds to the best system performance, then the first precoding matrix That is, the second target precoding matrix.
  • the network device may have poor system performance according to previous experience, such as the obtained equivalent channel of a certain precoding matrix, such as low system capacity.
  • the precoding matrix is grouped into the A group, and the remaining precoding matrix in the second target codebook is group B, and the group A is used to limit the terminal selection.
  • group B is a group that does not restrict the terminal to select. Then, the uplink channel matrix is simply multiplied with each precoding matrix in the B group to obtain a second target precoding matrix.
  • the purpose of selecting the target physical antenna with better system performance to send uplink information may be implemented.
  • the second target codebook is obtained by the second possible implementation of acquiring the second target codebook, that is, the second target codebook is the reduced codebook or has the restriction communication device selection
  • the method of the second target precoding matrix may adopt the following four implementable implementation manners, or the method of marking the code selected by the communication device is not limited:
  • the first implementation manner is: selecting one of the plurality of precoding matrices included in the second target codebook as the second target precoding matrix.
  • the second implementation manner is: if the method for obtaining the second target codebook is the method in the above e, the network device obtains the number of physical antennas for uplink transmission supported by the learned communication device, from the second target
  • the second target precoding matrix is determined in the plurality of first precoding matrices included in the codebook, and specifically, the number of physical antennas used by the network device for uplink transmission supported by the communication device can be indicated from the second target codebook. Any one of the precoding matrices of the number of physical antennas as the second target precoding matrix; or
  • the network device determines the second target precoding matrix from the plurality of precoding matrices included in the second target codebook according to the number of the physical antennas and the uplink channel information that are supported by the communication device, and is specifically:
  • the network device determines a plurality of fourth precoding matrices from the plurality of precoding matrices included in the second target codebook according to the number of physical antennas for uplink transmission supported by the learned communication device, and determines the uplink channel matrix and the fourth pre-determination.
  • the system performance of the equivalent channel obtained by multiplying the coding matrix is the best four precoding matrix as the second target precoding matrix.
  • a third implementation manner is: if the method for obtaining the second target codebook is the method in any of the foregoing a to b and e, the network device is configured according to the physical antenna supported by the known communication device for uplink transmission. And determining, by the plurality of precoding matrices included in the second target codebook, a second target precoding matrix, where the network device is capable of indicating a physical antenna supported by the communication device and used for uplink transmission in the second target codebook. Optional one precoding matrix in the coding matrix as the second target precoding matrix; or
  • the network device determines a plurality of fourth precoding matrices from the plurality of precoding matrices included in the second target codebook according to the physical antenna supported by the learned communication device for the uplink transmission, and determines the uplink channel matrix and the fourth precoding matrix.
  • the fourth precoding matrix with the best system performance of the equivalent channel obtained after multiplication is the second target precoding matrix.
  • the fourth implementation manner is: if the method for acquiring the second target codebook is the method of any one of the foregoing a to e, the network device, according to the uplink channel information, the plurality of first pre- Determining a second target precoding matrix in the coding matrix, specifically: multiplying the uplink channel matrix by a plurality of precoding matrices in the second target codebook to obtain a plurality of equivalent channel matrices, determining a system performance, etc.
  • the precoding matrix corresponding to the effect channel matrix is a second target precoding matrix.
  • the network device After the network device determines the number of layers of the uplink transmission and the second target precoding matrix, the network device sends the number of layers of the uplink transmission and the index of the second target precoding matrix in the second target codebook to the communication device. .
  • the number of layers of the uplink transmission and the index may be sent to the communication device by using Downlink Control Information (DCI), that is, the network device sends the DCI to the communication device, where the DCI includes the number of layers for uplink transmission and the second target precoding.
  • DCI Downlink Control Information
  • the indication information of the number of layers of the uplink transmission may occupy the first field of the DCI information, and the indication information of the index may occupy the second field of the DCI information.
  • the foregoing second target precoding matrix is in the second target codebook.
  • the number of layers in the index and the uplink transmission are independently encoded.
  • the index of the second target precoding matrix in the second target codebook and the number of layers of the uplink transmission may also be jointly coded, and the same indication information is used for indication, occupying one field of the DCI information; that is, the number of layers of the uplink transmission.
  • Each combination of the index of the precoding matrix defines a combined index indicating the combined index corresponding to the combination of the number of layers of the uplink transmission determined by the network device and the index of the second target precoding matrix.
  • step S206 if the number of layers of the uplink transmission and the index of the second target precoding matrix in the second target codebook are transmitted to the communication device through the DCI, the communication device receives the DCI, and obtains the number of layers and the pre-upstream of the uplink transmission after parsing.
  • the index of the encoding matrix is the number of layers of the uplink transmission and the index of the second target precoding matrix in the second target codebook.
  • the communication device determines the first target codebook according to the number of layers of the uplink transmission and the number of physical antennas included in the communication device. It can be understood by those skilled in the art that the first target codebook is the same as the second target codebook, the first target codebook is the codebook stored in the communication device, and the second target codebook is the code stored in the network device. this.
  • the precoding matrix corresponding to the index in the plurality of precoding matrices in the first target codebook is determined as the first target precoding matrix, and the first target precoding matrix and the second target precoding matrix are the same.
  • the second target codebook is the original codebook stored on the network device side corresponding to the number of layers transmitted in the uplink and the number of physical antennas included in the communication device
  • the first target codebook is also in communication.
  • the original codebook stored on the device side corresponding to the number of layers of the uplink transmission and the number of physical antennas included in the communication device.
  • the number of layers of the uplink transmission is 1, the number of physical antennas of the communication device is 4, and the first target codebook is also the codebook as shown in Table 2, and the number of layers transmitted by the network device according to the determined uplink is 1
  • the second target codebook determined when the communication device reports the four physical antennas is the same.
  • the first target precoding matrix is the codebook as shown in Table 2, if the index acquired by the communication device is 0, the first target precoding matrix is
  • the second target codebook is obtained by the second implementation manner of acquiring the second target codebook, that is, the second target codebook is not the original first codebook stored by the network device,
  • the first target codebook is also not the original first codebook stored by the communication device. The method for acquiring the first target codebook in this case will be described below.
  • the communication device may acquire the first target codebook before receiving the index of the second target precoding matrix sent by the network device to the communication device in the second target codebook and the number of layers of the uplink transmission, and may also receive the first target codebook at the communication device.
  • the second target precoding matrix sent by the network device acquires the first target codebook before the index in the second target codebook and the number of layers of the uplink transmission.
  • the first target codebook corresponding to the first target codebook may be acquired before the receiving of the second target precoding matrix sent by the network device to the communication device in the second target codebook and the number of layers of the uplink transmission
  • the method for determining the present invention can be implemented by the following two types of methods, but not limited to the two.
  • the first achievable manner is: the communication device acquires at least one target codebook according to the antenna capability of the communication device and the at least one first codebook, and according to the number of layers of the uplink transmission and the number of physical antennas of the terminal device, at least one In the target codebook, the first target codebook is determined.
  • the first codebook is a codebook corresponding to the antenna capability of the communication device stored on the communication device side. For example, if the communication device supports 1T4R, the first codebook has only one codebook, and the codebook shown in Table 2 can be used. If the communication device supports 2T4R, the first codebook has two codebooks shown in Tables 2 and 4.
  • the capabilities of the antenna include the number of physical antennas supported by the communication device for both uplink transmission and/or the physical antennas supported by the communication device for uplink transmission.
  • the network device side acquires the second target codebook (that is, the method corresponding to the above a) according to the number of physical antennas for the uplink transmission supported by the communication device and the first codebook, for each first codebook
  • the communication device is also configured to acquire the target codebook corresponding to the first codebook according to the number of physical antennas supported by the communication device and the first codebook, and the acquisition manner of each target codebook and the second target codebook. Get the same way.
  • the communication device is also used for each first codebook.
  • the target codebook corresponding to the first codebook is obtained according to the physical antenna for the uplink transmission and the first codebook supported by the communication device, and the acquisition manner of each target codebook is the same as that of the second target codebook.
  • the first target codebook Determining, according to the number of layers of the uplink transmission, the first target codebook from the at least one target codebook, that is, if the target codebook has multiple, the target codebook has the same target code as the uplink transmission layer. This is the first target codebook.
  • the communication device can acquire the first target codebook without interaction with the network device, and the network overhead is small.
  • the second achievable manner is: the network device sends the first indication information to the communication device, and after receiving the first indication information, the communication device acquires at least one target according to the first indication information and each codebook stored by the communication device. a codebook; determining, according to the number of layers of the uplink transmission and the number of physical antennas of the terminal device, from the at least one target codebook, the first target codebook.
  • the first indication information is used to indicate a precoding matrix used to obtain the first target codebook in the first codebook; or the first indication information is used to indicate that the first codebook is not used to obtain the first target codebook. a precoding matrix; or, the first indication information is used to indicate a precoding matrix group used to obtain the first target codebook in the first codebook, where the precoding matrix group includes the first codebook used to obtain the first target codebook a precoding matrix; or, the first indication information is used to indicate a precoding matrix group that is not used to obtain the first target codebook in the first codebook, where the precoding matrix group includes the first codebook not used to obtain the first target The precoding matrix of the codebook.
  • the "or" meaning between the foregoing first indication information is such that the first indication information has the following form:
  • the first indication information is used to indicate a precoding matrix used to obtain the first target codebook in the first codebook
  • the first indication information is used to indicate a precoding matrix that is not used to obtain the first target codebook in the first codebook
  • the first indication information is used to indicate a precoding matrix used to obtain the first target codebook in the first codebook and a precoding matrix not used to obtain the first target codebook;
  • the first indication information is used to indicate a precoding matrix group used to obtain the first target codebook in the first codebook, where the precoding matrix group includes precoding for acquiring the first target codebook in the first codebook.
  • the first indication information is used to indicate a precoding matrix group that is not used to obtain the first target codebook in the first codebook, and the precoding matrix group includes precoding that is not used to obtain the first target codebook in the first codebook.
  • the first indication information is used to indicate a precoding matrix group for acquiring the first target codebook in the first codebook and a precoding matrix group not used for acquiring the first target codebook.
  • the network device also transmits information indicating which precoding matrices the first precoding matrix group includes and/or information indicating which precoding matrices the second precoding matrix group includes to the communication device.
  • the determination method of the present invention can be implemented by the following four kinds of methods, but not limited to the four achievable methods.
  • the acquisition method of the first target codebook can be implemented by the following four, but not limited to, the four achievable manners.
  • the first achievable manner is: after receiving the number of layers of the uplink transmission, the communication device acquires the first codebook corresponding to the number of layers of the uplink transmission and the number of physical antennas of the communication device, according to the antenna capability of the communication device.
  • the first codebook acquires a first target codebook, and the first target codebook is a subset of the first codebook.
  • the capabilities of the antenna include the number of physical antennas supported by the communication device for both uplink transmission and/or the physical antennas supported by the communication device for uplink transmission.
  • the network device side acquires the second target codebook (ie, the method corresponding to the above a) according to the number of physical antennas for the uplink transmission and the first codebook supported by the communication device
  • the communication device is also according to the communication.
  • the number of physical antennas supported by the device for uplink transmission and the first codebook acquire the first target codebook, and the acquisition manner is the same as that of the second target codebook.
  • the communication device is also used according to the support of the communication device.
  • the physical antenna and the first codebook of the uplink transmission acquire the first target codebook, and the acquisition manner is the same as that of the second target codebook.
  • the communication device can acquire the first target codebook without interaction with the network device, and the network overhead is small.
  • the second achievable manner is: after receiving the number of layers of the uplink transmission, the communication device acquires a first codebook corresponding to the number of layers of the uplink transmission and the number of physical antennas of the communication device, according to the first codebook and the first Instructing information to obtain a first target codebook, the first target codebook being a subset of the first codebook.
  • the network device determines a plurality of second precoding matrices in the first codebook that are not restricted by the communication device selection (the first codebook is a number of layers stored in the uplink device and the physical antenna of the communication device)
  • the first code corresponding to the original codebook, and the plurality of second precoding matrices are as described above, and the first indication information is sent to the communication device, where the first indication information is the same as the first indication information, where No longer.
  • the first indication information may be sent to the communication device by using a Radio Resource Control (RRC) signaling, where the first indication information may send the second pre-communication to the communication device after the network device determines the first codebook.
  • RRC Radio Resource Control
  • the coding matrix is sent to the communication device before the index in the second target codebook and the number of layers of the uplink transmission.
  • the first codebook is the codebook shown in Table 3 above, and the network device learns, according to the antenna capability report information, the number of physical antennas for the uplink transmission supported by the communication device to determine the indexes 24 to 27 respectively. Is a plurality of second precoding matrices.
  • the bitmap may include the bitmap information.
  • the bitmap may have 40 bits, respectively indicating whether the 40 precoding matrices in the first codebook shown in Table 3 are restricted.
  • the format of the bitmap information may be 000000000000000000001111000000000000.
  • the first 24 zeros sequentially indicate that each precoding matrix corresponding to the index 0 to 23 of the first codebook shown in Table 3 restricts the communication device selection, that is, each precoding matrix corresponding to the indexes 0 to 23 is not used to acquire the first
  • the "1" of the 25th to 28th bits sequentially indicates that each precoding matrix corresponding to the indexes 24 to 27 of the first codebook shown in Table 3 does not restrict the selection of the communication device, that is, the indexes 24 to 27 correspond to Each precoding matrix is used to obtain a first target codebook
  • the "0" of the 26th to 40th bits sequentially indicate each precoding matrix restriction communication corresponding to the indexes 28 to 39 of the first codebook shown in Table 3.
  • Device selection, ie index 28 to 39 corresponds Each precoding matrix for obtaining a first target code is not present.
  • bitmap information may include indication information of the indexes 24 to 27 of the first codebook, or indication information of indexes 0 to 23 and indexes 28 to 39.
  • the communication device After receiving the number of layers of the uplink transmission, the communication device acquires the original codebook stored by the communication device and corresponding to the number of layers of the uplink transmission and the number of physical antennas of the communication device, which may also be referred to herein as the first codebook.
  • the original codebook corresponding to the number of physical antennas stored by the communication device corresponds to the original codebook corresponding to the number of physical antennas stored by the network device.
  • the communication device obtains the first target codebook according to the plurality of second precoding matrices for obtaining the first target codebook indicated by the first indication information sent by the network device, for example, if the communication device stores the number of layers transmitted in the uplink and
  • the original codebook (first codebook) corresponding to the number of physical antennas of the communication device is the codebook shown in Table 3.
  • the plurality of second precoding matrices are used by the network device for uplink transmission according to the support of the communication device.
  • the number of physical antennas is determined, and the number of physical antennas supported by the communication device for uplink transmission is 1, and the form of the first target codebook at this time is as shown in Table 6 above.
  • the network device will form a plurality of second precoding matrices into a first precoding matrix group, and the first codebook includes a plurality of third precoding matrices of the plurality of second precoding matrices to form a second precoding matrix group. That is, the first precoding matrix group is a group for acquiring the first target codebook, and the second precoding matrix group is a group not used for acquiring the first target codebook.
  • the first indication information may include two bits, one bit is used to indicate whether the first precoding matrix group is used to acquire the first target codebook, and the other bit is used to indicate whether the second precoding matrix group is used for acquiring.
  • the first target codebook for example, the second indication information may be in the form of “10”, and “1” indicates that each precoding matrix included in the first precoding matrix group is used to obtain the first target codebook, that is, the first precoding is indicated.
  • the matrix group is used to obtain the first target codebook; the "0" indicates that each precoding matrix included in the second precoding matrix group is not used to obtain the first target codebook, that is, the second precoding matrix group is not used to obtain the first target. Codebook.
  • the first indication information may include only indication information of an index of the first precoding matrix group, or the first indication information includes only indication information of an index of the second precoding matrix group.
  • the network device also transmits information indicating which precoding matrices the first precoding matrix group includes and/or information indicating which precoding matrices the second precoding matrix group includes to the communication device.
  • the communication device obtains the first target codebook according to the plurality of second precoding matrices included in the first precoding matrix group for acquiring the first target codebook indicated by the first indication information sent by the network device, for example, if the communication device stores The original codebook (first codebook) corresponding to the number of layers of uplink transmission and corresponding to the number of physical antennas of the communication device is the codebook shown in Table 3, and the plurality of second precoding matrices are network devices according to the communication device.
  • the supported communication device is determined by the physical antenna for uplink transmission, and the communication device can simultaneously transmit the uplink information through the physical antenna 0 and the physical antenna 2, and the physical antenna 0 and the physical antenna 3 simultaneously transmit the uplink information, and the physical antenna 1 and the physical antenna 2 simultaneously
  • the uplink information is transmitted, and the form of the first target codebook at this time is as shown in Table 8 above.
  • the third achievable manner is: after the network device determines a plurality of second precoding matrices in the first codebook that does not restrict the selection of the communication device (the first codebook is the number of layers stored in the network device and the uplink transmission and The original codebook corresponding to the number of physical antennas of the communication device, the plurality of second precoding matrices are grouped into a first precoding matrix group, and the first codebook is divided into a plurality of third of the plurality of second precoding matrices
  • the precoding matrix constitutes a second precoding matrix group, that is, the first precoding matrix group is a group for acquiring the first target codebook, and the second precoding matrix group is a group not used for acquiring the first target codebook.
  • the network device may send, by the DCI, the index of the second target precoding matrix in the second target codebook and the number of layers of the uplink transmission to the communication device, that is, the network device sends the DCI to the communication device, and the DCI includes the second target.
  • the index of the precoding matrix in the second target codebook and the number of layers of the uplink transmission may establish a correspondence between the precoding moment groups included in the first codebook and the parity of the time domain number occupied by the DCI, such as the time domain occupied by the first precoding moment group DCI.
  • the odd number corresponding to the second precoding moment group corresponds to the even number of the time domain occupied by the DCI; or the first precoding moment group corresponds to the even number of the time domain occupied by the DCI, and the second precoding moment group and the DCI The odd number of the occupied time domain corresponds.
  • the network device sends the third indication information to the communication device, where the third indication information is used to indicate a correspondence between the precoding moment groups included in the first codebook and the parity of the time domain number occupied by the DCI.
  • the network device also transmits information indicating which precoding matrices the first precoding matrix group includes and/or information indicating which precoding matrices the second precoding matrix group includes to the communication device.
  • the network device sends the DCI to the communication device in the time domain numbered odd.
  • the communication device acquires the DCI in the time domain numbered odd, and the communication device according to the first precoding corresponding to the odd number of the time domain occupied by the DCI of the first codebook indicated in the third indication information.
  • Each precoding matrix included in the matrix group obtains a first target codebook.
  • the network device sends the DCI to the communication device in the time domain numbered even.
  • the communication device acquires the DCI in the time domain numbered evenly, and the communication device according to the first precoding corresponding to the even number of the time domain occupied by the DCI of the first codebook indicated in the third indication information.
  • Each precoding matrix included in the matrix group obtains a first target codebook.
  • the fourth achievable manner is: after the network device determines a plurality of second precoding matrices in the first codebook that does not restrict the selection of the communication device (the first codebook is the number of layers stored by the network device and the uplink transmission and The original codebook corresponding to the number of physical antennas of the communication device, the plurality of second precoding matrices are grouped into a first precoding matrix group, and the first codebook is divided into a plurality of third of the plurality of second precoding matrices
  • the precoding matrix constitutes a second precoding matrix group, that is, the first precoding matrix group is a group for acquiring the first target codebook, and the second precoding matrix group is a group not used for acquiring the first target codebook.
  • the network device sends the DCI to the communication device, where the DCI includes an index of the second target precoding matrix in the second target codebook and a layer number of the uplink transmission, and then each precoding matrix group and each CRC mask included in the first codebook are established.
  • each precoding matrix group and each CRC mask included in the first codebook are established.
  • Corresponding relationship between groups for example, the first precoding moment group corresponds to the first CRC mask group, the second precoding moment group corresponds to the second CRC mask group, or the first precoding moment group and the second Corresponding to the CRC mask group, the second precoding moment group corresponds to the first CRC mask group.
  • the CRC mask group includes at least one CRC mask.
  • the fourth indication information is sent to the communication device, where the fourth indication information is used to indicate a correspondence between each precoding moment group included in the first codebook and each CRC mask group.
  • the network device also transmits information indicating which precoding matrices the first precoding matrix group includes and/or information indicating which precoding matrices the second precoding matrix group includes, to the communication device, and indicating the first CRC mask group Which CRC masks are included and/or the second CRC mask set includes which CRC masks are sent to the communication device.
  • the mask of the DCI sent by the network device to the communication device is a mask in the first CRC mask group.
  • the CRC mask obtained by the communication device after the DCI is parsed is the mask in the first CRC mask group, and the communication device according to the first precoding matrix corresponding to the first CRC mask group indicated in the fourth indication information.
  • Each precoding matrix included in the group obtains a first target codebook.
  • the mask of the DCI sent by the network device to the communication device is the mask in the second CRC mask group.
  • the CRC mask obtained by the communication device after the DCI is parsed is the mask in the second CRC mask group, and the communication device according to the first precoding matrix corresponding to the second CRC mask group indicated in the fourth indication information.
  • Each precoding matrix included in the group obtains a first target codebook.
  • the communication device determines, according to the first target precoding matrix corresponding to the index in the plurality of first precoding matrices, a target physical antenna used by the communications apparatus to send uplink information; the first target precoding matrix and the second target pre The coding matrix is the same.
  • the precoding matrix corresponding to the index in the first target codebook determined in step S206 is the first target precoding matrix.
  • the second target codebook is the same as the first target codebook, and since the first target precoding matrix and the second target precoding matrix correspond to the same index, the first target precoding matrix and the second target precoding The matrix is also the same.
  • the first target precoding matrix is If the indicated antenna is physical antenna 0, it is determined that the target physical antenna used by the communication device to transmit uplink information is physical antenna 0. If the first target precoding matrix is The antennas indicated are the physical antenna 0 and the physical antenna 2. The target physical antenna for determining the communication device for transmitting the uplink information is the physical antenna 0 and the physical antenna 2 simultaneously completing the transmission of one data stream.
  • the antenna port and the physical antenna may have a one-to-one mapping relationship, such as antenna port 0 mapping physical antenna 0, and antenna port 1 mapping.
  • Physical antenna 1 maps physical antenna 2
  • antenna port 3 maps physical antenna 3.
  • antenna port 0 maps physical antenna 0 and physical antenna 1
  • antenna port 1 maps physical antenna. 2 and physical antenna 3.
  • the antenna port corresponding to the uplink information is the antenna port 0 and the antenna port 1
  • the antenna port corresponding to the uplink information is antenna port 0.
  • the uplink transmission information of this embodiment may be data transmitted on the PUSCH.
  • the present embodiment is antenna selection for the PUSCH.
  • the at least part of the precoding matrix of the codebook may indicate a physical antenna of the communication device, and the network device acquires the second target precoding matrix according to the antenna capability and/or the uplink channel information supported by the communication device, and the second target is obtained.
  • the index indication of the precoding matrix is sent to the communication device, and according to the index, the communication device determines, from the codebook stored by the terminal side, the index corresponding to the first target precoding matrix, the first target precoding matrix and the second target precoding matrix.
  • the physical antenna indicated by the first target precoding matrix is a target physical antenna used by the determined communication device to transmit uplink information, and the uplink antenna selection of multiple communication devices supporting different antenna capabilities is implemented; and, if the second The target precoding matrix is determined by the network device according to the uplink channel information, and ensures that the communication device uses the target physical antenna to transmit uplink information, and the system has the best performance, that is, the target device can enable the communication device to select the target physical antenna with the best system performance. Send upstream information.
  • FIG. 3 is a signaling flowchart 2 of a method for selecting an uplink antenna according to an embodiment of the present disclosure. Referring to FIG. 3, the method in this embodiment includes:
  • Step S301 the network device determines the number of layers of the uplink transmission and the number of physical antennas of the communication device
  • Step S302 The network device determines, according to the number of layers of the uplink transmission and the number of physical antennas of the communication device, the second target precoding matrix;
  • Step S303 The network device sends, to the communication device, an index of the second target precoding matrix in the second target codebook and a number of layers of the uplink transmission.
  • Step S304 The communication device determines, according to the number of layers of the uplink transmission and the number of physical antennas included in the communication device, the first target codebook; the first target codebook and the second target codebook are the same, and the first target codebook includes multiple a precoding matrix;
  • Step S305 The communication device determines, according to the first target precoding matrix corresponding to the index in the plurality of first precoding matrices, a target physical antenna, a first target precoding matrix, and a second target precoding used by the communications apparatus to send uplink information.
  • step S301 and the step S302 in the present embodiment are processes for determining, by the network device, the number of layers of the uplink transmission and the second target precoding matrix according to the multiple information sent by the communication device.
  • step S201 in the previous embodiment refer to step S201 in the previous embodiment.
  • Step S303 is a process for the network device to send the index of the second target precoding matrix in the second target codebook and the number of layers of the uplink transmission to the communication device. For the specific implementation, refer to step S205 in the previous embodiment.
  • Step S304 is a process for determining a first target precoding matrix for the communication device. For the specific implementation, refer to step S206 in the previous embodiment.
  • Step S305 is a process for the communication device to determine the target physical antenna for transmitting the uplink information. For the specific implementation, refer to step S207 in the previous embodiment.
  • the method for selecting an uplink antenna of the embodiment implements selection of an uplink antenna of a plurality of communication devices supporting different antenna capabilities; and if the second target precoding matrix is determined by the network device according to the uplink channel information, the communication device is secured When the uplink information is transmitted by the target physical antenna, the performance of the system is the best, that is, the communication device can select the target physical antenna that performs the best performance of the system to transmit the uplink information.
  • the solution provided by the embodiment of the present application is introduced for the functions implemented by the network device and the communication device.
  • the network device and the communication device include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the respective functions described above.
  • the embodiments of the present application can be implemented in a combination of hardware or hardware and computer software in combination with the examples and steps described in the embodiments disclosed in the application. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the technical solutions of the embodiments of the present application.
  • the embodiment of the present application may divide the function module of the network device and the communication device according to the foregoing method example.
  • each function module may be divided according to each function, or two or more functions may be integrated into one processing unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software function module.
  • FIG. 4 is a schematic structural diagram 1 of a communication device provided by the present application, including a processor 21 and a communication bus 22, where the processor 21 is configured to call a program instruction stored in a memory to implement the method in the foregoing method embodiment, where the memory is a communication device. External memory.
  • FIG. 5 is a schematic structural diagram of a communication device provided by the present application.
  • the processor 31 is configured to invoke the program instructions stored in the 32 memory to implement the method in the foregoing method embodiment.
  • the communication device shown in FIG. 4 and FIG. 5 may be the communication device itself or a chip in the communication device, and the communication device or the chip has a function of implementing the method in the above method embodiment.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or software includes one or more units corresponding to the functions described above.
  • the processor mentioned above may be a central processing unit (CPU), a microprocessor or an application specific integrated circuit (ASIC), or may be one or more for controlling the above aspects or A program-implemented integrated circuit of any of its possible designs for the transmission of upstream information.
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • the application also provides a computer storage medium comprising instructions that, when executed on a communication device, cause the communication device to perform a corresponding method in the above-described method embodiments.
  • the application also provides a computer storage medium comprising instructions that, when executed on a communication device, cause the network device to perform a corresponding method in the above method embodiments.

Abstract

本申请实施例提供一种上行天线的选择方法和装置，该方法包括：从网络设备接收预编码矩阵的索引和上行传输的层数；根据上行传输的层数和通信装置的物理天线的数量，确定第一目标码本，第一目标码本包括多个第一预编码矩阵；根据多个第一预编码矩阵中上述索引对应的第一目标预编码矩阵，确定通信装置用于发送上行信息的目标物理天线。本申请实施例通过码本中具有多个可以指示物理天线的预编码矩阵，使得各种天线能力下的通信装置均可以实现从多根物理天线中选择用于发送上行信息的物理天线。

Description

上行天线的选择方法和装置 技术领域
本申请实施例涉及通信工程技术，尤其涉及一种上行天线的选择方法和装置。
背景技术
在用户通信装置(User Equipment,简称UE)的能力有限的情况下，UE配置较少的天线射频电路，通常发送天线的通道小于接收天线的通道。物理上行共享信道(Physical uplink shared channel，PUSCH)上行天线选择技术是指UE从多根物理天线中选择至少一根物理天线进行上行数据的发送。
对于长期演进(Long Term Evaluation,简称LTE)技术，由于UE能力不同，所配置的发送天线通道和接收天线通道数量有所差异(UE发射和接收可以共享相同物理天线)；根据UE能力不同，有的UE支持1个发送天线通道、2个接收天线通道(也就是1T2R)，有的UE支持1个发送天线通道、4个接收天线通道(也就是1T4R)，有的UE支持2个发送天线通道、4个接收天线通道(也就是2T4R)，还有的UE支持1个发送天线通道、8个接收天线通道(也就是1T8R)等等。
目前LTE中现有协议仅支持1T2R情况下的上行天线的选择，比如当高层信令使能闭环UE上行天线选择时，UE基于下行控制信息(Downlink Control Information，简称DCI)format 0，根据最近接收到的信令对PUSCH进行上行天线选择；或者，当UE有多个服务基站时，UE根据各基站各自对应的物理下行控制信道(Physical Downlink Control Channel，简称：PDCCH)/增强物理下行控制信道(Enhanced Physical Downlink Control Channel，简称EPDCCH)在DCI format 0中给定的子帧指示的相同的天线端口，确定PUSCH对应的天线。
而对于上述各种不同的终端能力，均能实现从多根物理天线中选择物理天线用于上行信息的发送，是亟待解决的问题。
发明内容
本申请实施例提供一种上行天线的选择方法和装置，使得各种天线能力下的通信装置均可以实现从多根物理天线中选择用于发送上行信息的物理天线。
第一方面，本申请实施例提供一种上行天线的选择方法，包括：
从网络设备接收预编码矩阵的索引和上行传输的层数；
根据所述层数和通信装置的物理天线的数量，确定第一目标码本，所述第一目标码本包括多个第一预编码矩阵；
根据所述多个第一预编码矩阵中所述索引对应的第一目标预编码矩阵，确定所述 通信装置用于发送上行信息的目标物理天线。
该方案通过根据网络设备发送的上行传输的层数通信装置的物理天线的数量，确定第一目标码本，根据网络设备发送的索引，从第一目标码本中的该索引对应的预编码矩阵，该预编码矩阵可以指示用于发送上行信息的物理天线，从而可使得各种天线能力下的终端设备均可以实现从多根物理天线中选择用于发送上行信息的物理天线。
所述第一预编码矩阵具有如下特点：
(1)所述第一预编码矩阵的行与所述通信装置的物理天线一一对应，所述第一预编码矩阵中包括非零元素的行对应的物理天线为所述用于发送上行信息的物理天线；
(2)1≤所述第一预编码矩阵中包括非零元素的行的数量≤所述通信装置支持的同时用于上行传输的物理天线的数量；
(3)所述第一预编码矩阵的列数与所述层数相同；
(4)所述第一预编码矩阵的归一化系数为所述第一预编码矩阵中非零元素的平方和的平方根的倒数；
该特点可以保证同时用于发送上行信息的物理天线分配的能量总和为1，而不是所有天线平分功率，从而保证上行信息的有效发送。
(5)所述第一预编码矩阵满足预设条件，所述预设条件为
Figure PCTCN2018081884-appb-000001
或者，所述预设条件为
Figure PCTCN2018081884-appb-000002
其中，W为所述第一预编码矩阵，W T为所述第一预编码矩阵的共轭转置矩阵，
Figure PCTCN2018081884-appb-000003
为对角矩阵，
Figure PCTCN2018081884-appb-000004
为对角矩阵。
该特点可以尽可能的消除信道间的干扰。
所述第一目标码本具有以下几种可能的形式：
第一种形式为：当所述层数为1且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
Figure PCTCN2018081884-appb-000005
Figure PCTCN2018081884-appb-000006
第二种形式为：当所述层数为2且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
Figure PCTCN2018081884-appb-000007
第三种形式为：当所述层数为1且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
Figure PCTCN2018081884-appb-000008
第四种形式为：当所述层数为2且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
Figure PCTCN2018081884-appb-000009
Figure PCTCN2018081884-appb-000010
在一种可能的设计中，所述方法还包括：
向所述网络设备发送天线能力上报信息，所述天线能力上报信息用于指示所述通信装置的天线能力，所述通信装置的天线能力包括：
所述通信装置支持闭环天线选择；或者，
所述通信装置包括的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线。
在一种可能的设计中，所述第一目标码本是第一码本的子集；
所述方法还包括：
根据所述通信装置的天线能力和所述第一码本获取所述第一目标码本；
其中，所述通信装置的天线能力包括：
所述通信装置支持闭环天线选择；或者，
所述通信装置包括的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线。
该获取第一目标码本的方案，无需通信装置和网络设备进行交互，节省开销。
在一种可能的设计中，所述第一目标码本是第一码本的子集；
所述方法还包括：
从所述网络设备接收第一指示信息；
根据所述第一指示信息获取所述第一目标码本。
其中，所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵；或者，
所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中不用于获取所述第一目标码本的预编码矩阵。
在一种可能的设计中，所述第一目标码本是第一码本的子集；
所述从网络设备接收预编码矩阵的索引包括：从所述网络设备接收下行控制信息DCI，所述DCI包括所述预编码矩阵的索引；
所述根据所述层数和通信装置包括的物理天线的数量确定第一目标码本包括：
根据所述层数和所述通信装置包括的物理天线的数量确定第一码本；
根据所述DCI所占用的时域获取所述第一目标码本；其中，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组，若所述DCI所占用的时域的编号为奇数时，所述第一预编矩阵组用于获取所述第一目标码本，或者若所述DCI所占用的时域的编号为偶数时，所述第二预编码矩阵组用于获取所述第一目标码本。
在一种可能的设计中，所述第一目标码本是第一码本的子集；
所述从网络设备接收预编码矩阵的索引包括：从所述网络设备接收下行控制信息DCI，所述DCI包括所述预编码矩阵的索引；
所述根据所述层数和通信装置包括的物理天线的数量确定第一目标码本包括：
根据所述层数和所述通信装置包括的物理天线的数量确定第一码本；
根据所述DCI的掩码获取所述第一目标码本；其中，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组，若所述DCI的掩码为第一掩码时，所述第一预编码矩 阵组用于获取所述第一目标码本，或者若所述DCI的掩码为第二掩码时，所述第二预编码矩阵组用于获取所述第一目标码本。
在一种可能的设计中，所述通信装置支持：
1个发射天线通道，2个接收天线通道；或者，
1个发射天线通道，4个接收天线通道；或者，
2个发射天线通道，4个接收天线通道；或者，
1个发射天线通道，8个接收天线通道；或者，
2个发射天线通道，8个接收天线通道。
第二方面，本申请实施例提供一种上行天线的选择方法，包括：
确定上行传输的层数和通信装置的物理天线的数量；
根据所述上行传输的层数和所述通信装置的物理天线的数量，确定第一目标预编码矩阵；
向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，所述第一目标编码矩阵用于指示所述通信装置用于发送上行信息的目标物理天线。
该方案通过网络设备确定上行传输的层数和第一目标预编码矩阵，并将上行传输的层数和第一目标预编码矩阵在第一目标码本中的索引发送至通信装置，以使通信装置根据所述层数和所述索引，确定第一目标预编码矩阵，根据第一预编码矩阵指示的用于发送上行信息的物理天线，确定用于发送上行信息的物理天线，从而可使得各种天线能力下的终端设备均可以实现从多根物理天线中选择用于发送上行信息的物理天线。
所述第一目标码本包括多个第一预编码矩阵，所述第一预编码矩阵具有如下特点：
(1)所述第一预编码矩阵的行与所述通信装置的物理天线一一对应；
其中，所述第一预编码矩阵中包括非零元素的行对应的物理天线为用于发送上行信息的物理天线。
(2)1≤所述第一预编码矩阵中包括非零元素的行的数量≤所述通信装置支持的同时用于上行传输的物理天线的数量。
(3)所述第一预编码矩阵的列数与所述层数相同。
(4)所述第一预编码矩阵的归一化系数为所述第一预编码矩阵中非零元素的平方和的平方根的倒数。
(5)所述第一预编码矩阵满足预设条件，所述预设条件为
Figure PCTCN2018081884-appb-000011
或者，所述预设条件为
Figure PCTCN2018081884-appb-000012
其中，W为所述第一预编码矩阵，W T为所述第一预编码矩阵的共轭转置矩阵，
Figure PCTCN2018081884-appb-000013
为对角矩阵，
Figure PCTCN2018081884-appb-000014
为对角矩阵。
其中，第一目标码本的形式与第一方面中的第一目标码本的形式，因为在网络设 备侧和通信装置侧存储的码本相同。
在一种可能的设计中，所述确定通信装置的物理天线的数量，包括：
从所述通信装置接收天线能力上报信息，所述天线能力上报信息用于指示所述通信装置的天线能力，所述通信装置的天线能力包括：所述通信装置的物理天线的数量。
在一种可能的设计中，所述根据所述上行传输的层数和所述通信装置的物理天线的数量，确定第一目标预编码矩阵，包括：
获取与所述上行传输的层数和所述通信装置包括的物理天线的数量对应的所述第一目标码本；
从所述第一目标码本中确定所述第一目标预编码矩阵。
在一种可能的设计中，所述第一目标码本为第一码本的子集；
所述根据所述上行传输的层数和所述通信装置包括的物理天线的数量，确定第一目标预编码矩阵，包括：
获取与所述上行传输的层数和所述通信装置包括的物理天线的数量对应的所述第一码本；
根据所述通信装置的天线能力，或者，上行信道信息，获取所述第一目标码本；
从所述第一目标码本中确定所述第一目标预编码矩阵；
其中，所述通信装置的天线能力包括：
所述通信装置支持闭环天线选择；或者，
所述通信装置包括的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
所述通信装置支持的同时用于上行传输的物理天线的数量。
在一种可能的设计中，向通信装置发送第一指示信息；
所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵；或者，
所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
所述第一码本中不用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中不用于获取所述第一目标码本的预编码矩阵。
在一种可能的设计中，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组；
若所述第一目标码本包括所述第一预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
在编号为偶数的时域上向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引；其中所述第一预编码矩阵组与偶数时域对应；或者，
若所述第一目标码本包括所述第二预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
在编号为奇数的时域上向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引，所述第二预编码矩阵组与奇数时域对应。
在一种可能的设计中，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组；
若所述第一目标码本包括所述第一预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引，所述DCI的掩码为第一CRC掩码，所述第一预编码矩阵组与所述第一CRC掩码对应；或者，
若所述第一目标码本包括所述第二预编码矩阵组，所述向所述通信装置发送DCI，所述DCI包括所述层数和所述索引，所述DCI的掩码为第二CRC掩码，所述第二预编码矩阵组与所述第二CRC掩码对应。
第三方面，本申请实施例提供一种通信装置，包括处理器；
所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现第一方面中涉及的上行天线选择的方法。
在一种可能的设计中，还包括所述存储器。
第四方面，本申请实施例提供一种通信装置，包括处理器；
所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现第二方面中涉及的上行天线选择的方法。
在一种可能的设计中，还包括所述存储器。
第五方面，本申请实施例提供一种计算机存储介质，包括指令，当所述指令在通信装置上运行时，使得所述通信装置执行第一方面中涉及的上行天线选择的方法。
第六方面，本申请实施例提供一种计算机存储介质，包括指令，当所述指令在通信装置上运行时，使得所述通信装置执行第二方面中涉及的上行天线选择的方法。
本申请实施例中通过码本的至少部分预编码矩阵可以指示通信装置的物理天线，网络设备根据通信装置支持的天线能力和/或上行信道信息获取目标预编码矩阵，并将该目标预编码矩阵的索引指示发送至通信装置，通信装置根据该索引，可从终端侧存储的码本中确定该索引对应目标预编码矩阵，网络设备确定的目标预编码矩阵和终端设备确定的目标预编码矩阵相同，目标预编码矩阵指示的物理天线即为确定的通信装置用于发送上行信息的目标物理天线，实现了支持不同天线能力的多种通信装置的上行天线的选择；而且，若第目标预编码矩阵是网络设备根据上行信道信息确定的，保证了通信装置采用目标物理天线发送上行信息时，系统的性能最好，也就是可以使得通信装置能够选择使得系统性能最好的目标物理天线发送上行信息。
附图说明
图1为本申请实施例提供系统架构图；
图2为本申请实施例提供的上行天线的选择方法的信令流程图一；
图3为本申请实施例提供的上行天线的选择方法的信令流程图二；
图4为本申请提供的通信装置的结构示意图一；
图5为本申请提供的通信装置的结构示意图二。
具体实施方式
首先对本申请中的部分用语进行解释说明，以便于本领域技术人员理解。
1、通信装置，包括：终端设备，终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。通信装置可以是无线局域网(wireless local area networks，WLAN)中的站点(station，ST)，可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，第五代通信(fifth-generation，5G)网络中的通信装置或者未来演进的公共陆地移动网络(public land mobile network，PLMN)网络中的通信装置，新空口(new radio，NR)通信系统中的通信装置等。
作为示例而非限定，在本申请实施例中，该通信装置还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
另外，通信装置还可以包括无人机，如无人机上的机载通信设备等。
2、网络设备，可以是用于与移动设备通信的设备，网络设备可以是WLAN中的接入点(access point，AP)，GSM或CDMA中的基站(base transceiver station，BTS)，也可以是WCDMA中的基站(nodeB，NB)，还可以是LTE中的演进型基站(evolutional node B，eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及未来5G网络中的网络设备或者未来演进的PLMN网络中的网络设备，或NR系统中的新一代基站(new generation node B,gNodeB)等。
另外，在本申请实施例中，网络设备为小区提供服务，通信装置通过该小区使用的传输资源(例如，频域资源，或者说，频谱资源)与网络设备进行通信，该小区可以是网络设备(例如基站)对应的小区，小区可以属于宏基站，也可以属于小小区(small cell)对应的基站，这里的小小区可以包括：城市小区(metro cell)、微小区(micro cell)、微微小区(pico cell)、毫微微小区(femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。
3、上行信道矩阵：
Figure PCTCN2018081884-appb-000015
h mn为接收端的第m根天线与发射端的第n根天线之间的子信道的冲激响应，对于上行信道矩阵而言，发射端为通信装置，接收端为网络设备，冲激响应是网络设备根据发射端相应天线发射的探测参考信号(Sounding Reference Signal，简称SRS)获取到的。
4、开环天线选择与闭环天线选择：a、开环天线选择：PUSCH在通信装置具有的多根天线间交替发射，或者说上行数据轮流在天线间交替发送，而避免单条信道的快衰落。b、闭环天线选择：通信装置必须从不同的天线发送参考信号，用于基站进行信道质量测量，然后选择信道质量好的天线进行数据发送。
5、天线端口：天线端口包括用于承载上行数据传输的信道(简称上行数据信道，比如PUSCH)的天线端口，用于承载解调的参考信号(简称解调参考信号，如解调参考信号(demodulation reference signal，简称DMRS))的天线端口，用于承载信道探测的参考信号(简称信道探测参考信号，如SRS)的天线端口等，即天线端口指的是用于承载具体的物理信道和/或物理信号的天线端口。
其中，通过相同天线端口所发送的信号，无论这些信号是否是通过相同或不同的物理天线发送，他们在空间传输所经历的路径所对应的信道可视为相同或者相关(比如大尺度信道特性—信道矩阵相同)；也就是说，在相同的天线端口所发送的信号，接收端在解调时可以认为其信道相同或者相关，即天线端口是一种逻辑上的含义，信号接收端通常通过天线端口识别具有不同传输信道的信号。
6、物理天线：可也以称为用户天线或用户天线端口或用户端口等，也可称为发送天线或接收天线，物理天线可以和天线的馈电口具有对应关系。
一般来说一个物理天线是指一个物理天线的阵元。物理天线也用端口来标识，但此处的端口不同于5中用于承载物理信道的天线端口。发送天线是一个物理上的含义，其在设计中可以和天线端口有关联，也可以无关联，不同的物理天线可以通过不同的标识或者索引进行区分。
一般来说，天线端口和物理天线的映射关系是实现问题。可以对一个或多个物理天线进行加权，形成一个天线端口。天线端口与用户的发送天线阵子单元的映射也可以为用户实现问题，用户可以对发送天线阵子单元进行编号，将天线端口与发送天线阵子单元映射。
综上所述，天线端口是一个逻辑上的概念，它与物理天线并没有一一对应的关系，其可以与物理天线之间一一映射，可以一个天线端口与多根物理天线映射，还可以多个天线端口与一根物理天线映射。上行数据在传输的过程中会经物理天线映射到与物理天线对应的天线端口上进行上行数据的发送。
下面对本申请实施例涉及的系统架构进行说明。
图1为本申请实施例提供系统架构图。参见图1，该架构包括通信装置10和网络设备20其中，通信装置10例如可以为UE，网络设备20可以为基站，其中，基站向终端传输数据的过程为下行传输，终端向基站传输数据的过程为上行传输。
具体地，网络设备20确定上行传输的层数和第二目标预编码矩阵，将上行传输的层数和第二目标预编码矩阵在第二目标码本中的索引发送至通信装置10，其中，第二目标码本是网络设备20根据上行传输的层数和通信装置具有的物理天线的数量确定的。通信装置10根据上行传输的层数和通信装置具有的物理天线的数量，确定第一目标码本，将第一目标码本中上述索引所指示的预编码矩阵确定为第一目标预编码矩阵，根据第一目标预编码矩阵指示的物理天线，确定用于发送上行信息的目标物理天线。
本申请实施例中通过设置可以指示物理天线的预编码矩阵，那么通信装置确定的用于上述数据编码的第一目标预编码矩阵指示的物理天线，即为选择的用于发送上行信息的物理天线，实现了支持不同天线能力的通信装置的上行天线的选择。
下面采用具体的实施例，对本申请的上行天线的选择方法进行详细的说明。
图2为本申请实施例提供的上行天线的选择方法的信令流程图一，参见图2，本实施例的方法包括：
步骤S201、通信装置向网络设备发送SRS；
步骤S202、通信装置向网络设备发送上行天线能力信息，上行天线能力信息用于指示通信装置的天线能力；通信装置的天线能力包括通信装置包括的物理天线的数量；或者，通信装置支持的同时用于上行传输的物理天线的数量；或者，通信装置支持的同时用于上行传输的物理天线；
步骤S203、网络设备根据SRS，确定上行信道信息，并根据上行信道信息，确定上行传输的层数；
步骤S204、网络设备根据上行传输的层数和通信装置包括的物理天线的数量，确定第二目标码本，并根据通信装置的天线能力，或者，上行信道信息，从第二目标码本中确定第二目标预编码矩阵；
步骤S205、网络设备向通信装置发送第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数；
步骤S206、通信装置根据上行传输的层数和通信装置的物理天线的数量，确定第一目标码本，第一目标码本和第二目标码本相同，第一目标码本包括的多个第一预编码矩阵；
步骤S207、根据多个第一预编码矩阵中上述索引对应的第一目标预编码矩阵，确定通信装置用于发送上行信息的目标物理天线；第一目标预编码矩阵和第二目标预编码矩阵相同。
具体地，对于步骤S201～步骤S203，通信装置的每根物理天线都会发送SRS至网络设备，网络设备根据SRS，确定上行信道信息，并根据上行信道信息，确定上行传输的层数。其中，上行传输的层数是指能够独立并行传输的数据流的数量。
其中，上行信道信息是指与上行信道的质量相关的信息，比如上行信道矩阵，即网络设备可根据SRS，得到一个上行信道矩阵；而上行信道矩阵的秩就是上行传输的 层数。其中，上行信道矩阵的获取方法，可参照现有的方法，本实施例中不再赘述。
通信装置还会发送上行天线能力信息至网络设备，其中，天线能力上报信息用于指示通信装置的天线能力，天线能力包括：
(1)通信装置支持闭环天线选择；或者，
(2)通信装置包括的物理天线的数量；或者，
(3)通信装置支持的同时用于上行传输的物理天线的数量；或者，
(4)通信装置支持的同时用于上行传输的物理天线。
其中，(1)、(2)、(3)、(4)之间的“或者”的含义为通信装置的天线能力可为(1)，或者为(2)，或者为(3)，或者为(4)，或者为(1)和(2)，或者为(3)或(4)，或者为(1)和(3)，或者为(1)和(4)，或者为(2)和(4)，或者为(2)和(3)，或者为(1)和(2)和(3)，或者为(1)和(2)和(4)，或者为(2)和(3)和(4)，或者为(1)和(3)和(4)，或者为(1)和(2)和(3)和(4)，即通信装置的天线能力可为中(1)、(2)、(3)、(4)任意一个对应的能力或者任意二个对应的能力或者任选三个对应能力或者全部的能力。
在本实施例的场景下，天线能力至少包括通信装置支持闭环天线选择以及通信装置包括的物理天线的数量。
对于(1)：通信装置支持闭环天线选择的能力；
本领域技术人员可以理解的是，若通信装置不支持PUSCH闭环天线选择的能力，则无法进行上行天线的选择。
对于(2)：通信装置包括的物理天线的数量；若通信装置支持1T4R，则通信装置包括的物理天线的数量为4，若通信装置支持2T8R，则通信装置包括的物理天线的数量为8。
对于(3)通信装置支持的同时用于上行传输的物理天线的数量，此处的“同时”是指“同一时刻”，那么同时用于上行传输的物理天线的数量，也就是通信装置能够在同一时刻发送上行信息的物理天线的数量，若通信装置支持1T4R，则同时用于上行传输的物理天线的数量为1，若通信装置支持2T4R，则同时用于上行传输的物理天线的数量为2。
对于(4)通信装置支持的同时用于上行传输的物理天线；
其中，天线能力上报信息中可包括物理天线组的索引的指示信息，以节省信息比特开销，物理天线组至少包括一根物理天线，具体说明如下：
对通信装置的所有可能传输的物理天线进行分组的方法，可以是通信装置预定义的、或基于信令指示的，信令可以是高层信令，例如无线资源控制(Radio Resource Control，简称：RRC)信令或媒体介入控制控制元素(Medium Access Control Control Element，简称MAC CE)信令等，也可以是物理层信令，例如DCI信令等。
若通信装置支持1T4R，物理天线的索引依次为0、1、2、3，此时物理天线被分为4组，每组一根天线，在天线能力上报信息中，可2比特信息指示不同的物理天线，比如，可用―00‖指示索引0，也就是指示索引为0的物理天线，可用―01‖指示索引1，也就是指示索引为1的物理天线，可用―10‖指示索引2，也就是指示索引为2的物理天线，可用―11‖指示索引3，也就是指示索引为3的物理天线。
又例如：通信装置支持2T4R，此时4根物理天线按照不同的组合可被分为6组，每组包括两根物理天线，物理天线0和物理天线2的组成的组的索引可为0、物理天线1和物理天线3的组成的组的索引可为1，物理天线0和物理天线1的组成的组的索引可为2，指示物理天线2和物理天线3组成的组的索引可为3，物理天线1和物理天线2组成的组的索引可为4，物理天线0和物理天线3组成的组的索引可为5；可以用3比特信息指示不同的物理天线组的索引，可用―000‖指示索引0，也就是指示物理天线0和物理天线2的组成的组(可表示为(0,2))；可用―001‖指示索引1，也就是指示物理天线1和物理天线3的组成的组(可表示为(1,3))，可用―010‖指示索引2，也就是指示物理天线0和物理天线1的组成的组(可表示为(0,1))，可用―011‖指示索引3，也就是指示物理天线2和物理天线3的组成的组(可表示为(2,3))，可用―100‖指示索引4，也就是指示物理天线1和物理天线2的组成的组(可表示为(1,2))，可用―101‖指示索引5，也就是指示物理天线0和物理天线3的组成的组(可表示为(0,3))。
但是，由于通信装置物理硬件的限制，通信装置中有的物理天线组并不能用于发送上行信息，也就是说若通信装置支持的天线能力为1T4R，编号为3的物理天线组成的物理天线组可能因为硬件的限制，不能用于发送上述信息；又比如，若通信装置支持的天线能力为2T4R，编号为0的物理天线和编号为1的物理天线组成的物理天线组可能因为射频链设置位置的限制，不能用于发送上述信息。
一种情况下，天线能力上报信息中可直接包括通信装置支持的同时用于上行传输的物理天线的索引的指示信息，或者通信装置不支持同时用于上行传输的物理天线的索引的指示信息。此处，同时用于上行传输的物理天线是指上述的物理天线组。
比如：当通信装置支持2T4R，天线能力上报信息中可包括上述物理天线组的索引的指示信息，比如由于终端的硬件限制，物理天线组(0,2)、物理天线组(0,3)物理天线组(1,2)物理天线组(1,3)为通信装置支持的同时用于上行传输的物理天线，天线能力上报信息中可直接包括的是物理天线组(0,2)、物理天线组(0,3)物理天线组(1,2)物理天线组(1,3)各自的索引的指示信息，或者是天线能力上报信息中可直接包括的是物理天线组(0,1)、物理天线组(2,3)各自的索引的指示信息。
在上述情况下，网络设备根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量和通信装置支持的同时用于上行传输的物理天线组的索引的指示信息，确定通信装置支持的同时用于上行传输的物理天线，或者网络设备根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量和通信装置不支持同时用于上行传输的物理天线组的索引的指示信息，确定通信装置不支持同时用于上行传输的物理天线，进而确定通信装置支持的同时用于上行传输的物理天线。
另一种情况，天线能力上报信息中包括的是通信装置包括的至少部分物理天线的索引的指示信息，网络设备根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量，将天线能力上报信息中指示的物理天线进行组合得到通信装置支持的同时用于上行传输的物理天线，或者网络设备根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量，将天线能力上报信息中 指示的物理天线进行组合得到通信装置不支持同时用于上行传输的物理天线，进而确定通信装置支持的同时用于上行传输的物理天线。
比如：当通信装置支持2T4R，天线能力上报信息中包括物理天线的索引信息，比如包括物理天线0的索引的指示信息、物理天线2的索引的指示信息、物理天线3的索引的指示信息，网络设备根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量2，确定通信装置支持的同时用于上行传输的物理天线：物理天线0，或者，物理天线2，或者，物理天线3，或者，物理天线0和物理天线3，或者，物理天线0和物理天线2，或者，物理天线2和物理天线3。此时，虽然通信装置支持的同时用于上行传输的物理天线的数量为2，也可以仅采用一根物理天线进行上行传输，因此，才出现了物理天线0，或者，物理天线2，或者，物理天线3的确定。
本领域技术人员应明白，通信装置支持的同时用于上行传输的物理天线，是根据天线能力上报信息中指示的通信装置支持的同时用于上行传输的物理天线的数量和通信装置支持的同时用于上行传输的物理天线组或者物理天线组的索引的指示信息决定的。
通过上述对天线能力上报信息的说明，网络设备在解析天线能力上报信息后，可获知通信装置包括的物理天线的数量，或者，通信装置支持的同时用于上行传输的物理天线。
对于步骤S204、在网络设备确定了上行传输的层数和通信装置的天线能力后，就可以确定用于上行信息编码的预编码矩阵。
在说明第二目标预编码矩阵的确定方法之前，首先对本申请实施例涉及的码本进行介绍。
在本实施例中，每个上行传输的层数对应多个码本，与同一层数对应的多个码本中的每个码本与通信装置支持的天线能力相对应。
下面以与具有N根物理天线的通信装置对应的部分码本进行说明，码本中的至少部分预编码矩阵(称为第一预编码矩阵)满足如下规则：第一预编码矩阵满足预设条件，预设条件为
Figure PCTCN2018081884-appb-000016
或者，预设条件为
Figure PCTCN2018081884-appb-000017
其中，W为所述第一预编码矩阵，W T为所述第一预编码矩阵的共轭转置矩阵，
Figure PCTCN2018081884-appb-000018
为对角矩阵，
Figure PCTCN2018081884-appb-000019
为对角矩阵。
此外，第一预编码矩阵具有如下特点，：
(1)第一预编码矩阵的行数与通信装置的物理天线的数量相同，即为N行，第一预编码矩阵的行与通信装置的物理天线一一对应，比如N＝4，4根物理天线分别为物理天线0、物理天线1、物理天线2、物理天线3，第一行可对应物理天线0、第二行可对应物理天线1、第三行可对应物理天线2、第四行可对应物理天线3。
本领域技术人员应当明白，此处，每一行与哪根物理天线对应，上行信道矩阵中的相应列的冲激响应就是根据哪根物理天线发射的SRS得到的。
(2)第一预编码矩阵中包括非零元素的行对应的物理天线为用于发送上行信息的物理天线；比如第一预编码矩阵为
Figure PCTCN2018081884-appb-000020
如(1)所述，该第一预编码矩阵对应的通信装置具有4根物理天线，上行传输的层数为1，如(2)所述，第一行可对应物理天线0，由于该第一预编码矩阵的所有包括非零元素的行为第一行，则该第一预编码矩阵指示的物理天线为物理天线0。
又比如：第一预编码矩阵
Figure PCTCN2018081884-appb-000021
如(1)所述，该第一预编码矩阵对应的通信装置具有4根物理天线，上行传输的层数为2，如(2)所述，第二行可对应物理天线1，第四行可对应物理天线3，由于该第一预编码矩阵的所有包括非零元素的行为第二行和第四行，则该第一预编码矩阵指示的物理天线为物理天线1和物理天线3。
(3)1≤第一预编码矩阵中包括非零元素的行的数量≤通信装置支持的同时用于上行传输的物理天线的数量，比如若通信装置支持的天线能力为2T4R，则通信装置能够支持的在同一时刻发送上行信息的天线数量为2。
(4)第一预编码矩阵的列数与上行传输的层数相同；
(5)第一预编码矩阵中的各列向量相互正交。
那么，当上行传输的层数为1，通信装置的物理天线的数量为4时，上行传输对应的码本可如表1所示：
表1
Figure PCTCN2018081884-appb-000022
Figure PCTCN2018081884-appb-000023
其中，表1所示的码本中所有的预编码矩阵均为符合上述条件的第一预编码矩阵。参见表1，表1中的第一列为预编码矩阵的索引，同一行中的第一预编码矩阵对应的索引，从左到右依次增大，比如
Figure PCTCN2018081884-appb-000024
的索引为0，
Figure PCTCN2018081884-appb-000025
的索引为1，等等。
表1中的码本基于通信装置包括的所有物理天线平分功率，然而实际情况中并不是所有的天线都同时发送上行信息，所有物理天线平分功率会导致实际发送上行信息的天线的功率不高，不利于上行信息的有效发送。
因此，为了保证同时用于发送上行信息的物理天线分配的能量总和为1，而不是所有天线平分功率，从而保证上行信息的有效发送，上述第一预编码矩阵还可满足如下的条件：
(6)第一预编码矩阵的归一化系数为第一预编码矩阵中非零元素的平方和的平方根的倒数。此时，当上行传输的层数为1，通信装置具有4根物理天线时，上行传输对应的码本可如表2所示：
表2
Figure PCTCN2018081884-appb-000026
Figure PCTCN2018081884-appb-000027
当上行传输的层数为1，通信装置具有4根物理天线，且第一预编码矩阵满足条件(1)～(6)时，上行传输对应的码本还可如表3所示：
表3
Figure PCTCN2018081884-appb-000028
Figure PCTCN2018081884-appb-000029
表3所示的码本中索引16～43所对应的预编码矩阵均为符合上述条件的第一预编码矩阵，索引0～15所对应的预编码矩阵为现有技术中的预编矩阵。参见表3，同一行中的第一预编码矩阵对应的索引，从左到右依次增大，比如
Figure PCTCN2018081884-appb-000030
的索引为24，
Figure PCTCN2018081884-appb-000031
的索引为25，等等。
当上行传输的层数为2，通信装置具有4根物理天线且第一预编码矩阵满足条件(1)～(6)时，上行传输对应的码本可如表4或表5所示：
表4
Figure PCTCN2018081884-appb-000032
表5
Figure PCTCN2018081884-appb-000033
其中，表4所示的码本中所有的预编码矩阵均为符合条件(1)～(6)的第一预编码矩阵。参见表4，同一行中的第一预编码矩阵对应的索引，从左到右依次增大，比 如
Figure PCTCN2018081884-appb-000034
的索引为0，
Figure PCTCN2018081884-appb-000035
的索引为1，等等。
而表5所示的码本中索引16～33所对应的预编码矩阵均为符合条件(1)～(6)的第一预编码矩阵，索引0～15所对应的预编码矩阵为现有技术中预编码矩阵，也就是说表5所示的码本为在现有技术的码本中增加符合上述条件的多个第一预编码矩阵。参见表5，同一行中的第一预编码矩阵对应的索引，从左到右依次增大，比如
Figure PCTCN2018081884-appb-000036
的索引为16，
Figure PCTCN2018081884-appb-000037
的索引为17，等等。
本领域技术人员可以理解的是，若通信装置包括的物理天线的数量为8，上行传输的层数为1时，相应的码本中的第一预编码矩阵具有8行，列数为1列；若通信装置的物理天线的数量为2，上行传输的层数为1时，相应的码本中的第一编码矩阵具有2行，列数为1列。也就是说同一个上行传输的层数根据终端包括的物理天线的数量的不同对应多个不同的码本。
本领域技术人员应当明白，上述各码本在通信装置和网络设备各存储有一份，与同一层数和同一物理天线的数量对应的码本仅存储一种形式，比如，若通信装置和网络设备侧存储的码本为如表2所示的码本，那么表3所示的码本就不会存储，若通信装置和网络设备侧存储的码本为如表3所示的码本，那么表2所示的码本就不会存储。
此外，本领域技术人员可以理解的是，每个预编码矩阵对应一个索引，上表中各预编码矩阵各自的索引为示例性举例，并不限于上述各表中的索引；其中，一个码本包括的各预编码矩阵的各自的索引可以由标准定义，也可以是由通信装置和网络设备协商确定。
综上可知，上述第一预编码矩阵可以实现指示通信装置的物理天线的作用。下面对上述的第一预编码矩阵既有指示终端的物理天线的功能，还能起到现有技术中的预编码矩阵具有的消除信道间的干扰的功能的原因，进行说明。
首先对现有技术中预编码矩阵的获取原理进行说明。
接收端到的信号向量的计算方法如公式一所示：
r＝Hs+n                     公式一；
其中，r、H、s和n分别表示接收信号向量、信道矩阵、发送信号向量和加性噪声向量。
若
Figure PCTCN2018081884-appb-000038
(发送端两根物理天线、接收端两根物理天线对应的信道矩阵)，
Figure PCTCN2018081884-appb-000039
则
Figure PCTCN2018081884-appb-000040
也就是接收端的第一根天线接收到的信号r 1中既有发送端的第一根天线发送的信号x 1经过信道h 11后的信号，又有第二根天线发送的信号x 2经过信道h 12后的信号，接收端的第二根天线接收到的信号中既有发送端的第二根天线发送的信号x 2经过信道h 22后的信号，又有第一根天线发送的信号x 1经过信道h 21后的信号，信道间干扰或信号间干扰较大。
若信道矩阵是对角阵时，例如
Figure PCTCN2018081884-appb-000041
发送信号经过信道到达接收端的接收信号向量为
Figure PCTCN2018081884-appb-000042
接收端的第一根天线接收到的信号r 1中不包含第二根天线发送的信号x 2经过信道h 12后的信号，接收端的第二根天线接收到的信号中不包含第一根天线发送的信号x 1经过信道h 21后的信号，即消除了信道间干扰或信号间干扰，但是MIMO信道矩阵不具有对角阵的特征。
通过对信道矩阵H进行奇异值分解(Singular Value Decomposition，简称SVD)：通过对信道矩阵H进行SVD(Singular Value Decomposition，奇异值分解)：
Figure PCTCN2018081884-appb-000043
得到左奇异矩阵U、对角阵S和右奇异矩阵V，其中矩阵U矩阵V均是酉阵，酉阵与自身的共轭转置矩阵相乘的结果为单位阵，即U HU＝UU H＝V HV＝VV H＝I，如果发送信号在经过信道之前，对发送信号进行预处理，即发送信号左乘一个预编码矩阵W，且预编码矩阵W是信道矩阵H的右奇异矩阵V的共轭转置矩阵V H，经过预编码后的信号再经过信道，接收端接收到的信号
Figure PCTCN2018081884-appb-000044
接收端对接收信号左乘酉阵U的共轭转置，即
Figure PCTCN2018081884-appb-000045
相当于发送信号直接与对角阵相乘，所以，经过预编码之后的信号在经历空间信道后等价为一组相互之间没有干扰的数据，避免了信道间干扰或信号间干扰问题。
因此，理想的预编码矩阵为信道矩阵的右奇异矩阵V的共轭转置矩阵V H，但由于完整且准确的信道信息的数据量庞大，网络设备通知通信装置上行信道时将占用大量的下行资源，因此为减少开销，基于码本的预编码技术对各种形式的V进行压缩量化并进行编号，得到了现有技术中的各预编码矩阵，比如表3中的索引0～15各自指示的预编码矩阵，索引16～23各自指示的预编码矩阵系数更改为1/2后的各预编码矩阵，表5中的0～15指示的预编码矩阵。现有技术中的预编码矩阵也满足如下条件：预编码矩阵的共轭转置矩阵与预编码矩阵相乘后能够得到对角阵。
接着对本实施的第一预编码矩阵可以指示物理天线，也可以消除信道间的干扰的原因进行说明。
对比现有技术的各预编码矩阵，本申请实施中的可以指示物理天线的预编码矩阵是将现有技术中的各预编码矩阵中某些行的非零元素置0，使得一些行的元素全为0元素，以达到可以指示物理天线的功能。若信道矩阵和现有技术中的预编码矩阵W 1相乘后，再左乘一个左奇异矩阵U的共轭转置矩阵，使得接收端在计算接收端的接收信号时，相当于发送信号直接与第一对角阵相乘，也就是经预编码矩阵W 1预编码之后的信号在经历空间信道后能够等价为一组相互之间没有干扰的数据；那么，根据矩阵相乘的原理，将现有技术中的各预编码矩阵中某些行的非零元素置0，使得一些行的元素全为0元素后得到的可以指示物理天线的第一预编码矩阵W 1也满足以下条件：信道矩阵和第一预编码矩阵W 2相乘后再左乘一个左奇异矩阵U的共轭转置矩阵，使得接收端在计算接收端的接收信号时，相当于发送信号直接与第二对角阵相乘，也就是经预编码矩阵W 2预编码之后的信号在经历空间信道后能够等价为一组相互之间没有干扰的数据。只不过上述的第二对角阵中肯定存在0元素。
在实际的过程中，理想情况下的预编码矩阵(为信道矩阵的右奇异矩阵V的共轭转置矩阵V H)并不存在，经过压缩量化后的现有的预编码矩阵只能尽可能的消除信道间的干扰，同样，根据矩阵相乘原理，将现有技术中的预编码矩阵中某些行的非零元素置0，使得一些行的元素全为0元素后得到的第一预编码矩阵与上行信号相乘后，在左乘左奇异矩阵U的共轭转置矩阵与信道矩阵，达到的消除信道间的干扰的效果与现有的预编码矩阵的效果是相同的。
基于上述对本实施例涉及的码本的介绍，下面对本申请实施例中步骤S204中第二目标预编码矩阵的确定方法进行说明。
在确定第二目标预编码矩阵时，需要先确定第二目标码本。
第二目标码本的确定的方法可采用如下两种可实现的实施方式：
第一种可实现的实施方式为：获取网络设备存储的与上行传输的层数和通信装置包括的物理天线的数量对应的第一码本，也就是原始存储在网络设备侧的码本，确定第一码本为第二目标码本。
比如：若上行传输的层数为1，网络设备解析天线能力上报信息后，网络设备获知通信装置具有4根物理天线，则选择与传输的层数1且与通信装置具有4根物理天线对应的码本，作为第二目标码本，此时，第二目标码本可为上述表2所示的码本；若上行传输的层数为2，且解析天线能力上报信息后，网络设备获知通信装置具有4根天线，则选择与上行传输的层数为2且与通信装置具有4根物理天线对应的码本，作为第二目标码本，此时，第二目标码本可为上述表4所示的码本。
第二种可实现的实施方式为：获取网络设备存储的与上行传输的层数和通信装置包括的物理天线的数量对应的第一码本；也就是原始存储在网络设备侧的码本；网络设备根据通信装置的天线能力，或者，上行信道信息，以及第一码本，获取第二目标码本。第二目标码本是第一码本的子集。
网络设备根据通信装置的天线能力，或者，上行信道信息，可以理解为：(1)网络设备仅根据通信装置的天线能力，(2)网络设备仅根据上行信道信息，(3)网络设备根据通信装置的天线能力和上行信道信息。
具体地，网络设备会根据通信装置的天线能力，或者，上行信道信息，获取第一码本中组成第二目标码本的多个第二预编码矩阵(也就是不限制通信装置选择的预编码矩阵)；根据多个第二预编码矩阵，获取第二目标码本。此处的获取第二目标码本可以理解为：将第一码本中的多个第二预编码矩阵提取出来，重新得到一个相对于第一码本缩小的第二目标码本(此时，第二预编码矩阵在第一码本中的索引与第二预编码矩阵在第二码本中的索引可能不相同)。此处的获取第二目标码本还可以理解为：将第一码本中的多个第二预编码矩阵标记为不限制通信装置选择，或者将第一码本中的除了多个第二预编码矩阵以外的预编码矩阵标记为限制通信装置选择，相当于得到了一个具有限制通信装置选择标记或者不限制通信装置选择标记的码本(此时，第二预编码矩阵在第一码本中的索引与第二预编码矩阵在第二目标码本中的索引相同)。
具体地，获取第二目标码本的方法具有以下a～e所示的五种可实现的方式。
具体地，a、网络设备根据通信装置支持的同时用于上行传输的物理天线的数量，确定第一码本中不限制终端选择的多个第二预编码矩阵，具体为：将能够指示该数量的物理天线的多个第一预编码矩阵确定为多个第二预编码矩阵。可以理解的是，该方法对应的天线能力上报信息中指示的天线能力还至少包括通信装置支持的同时用于上行传输的物理天线的数量。
比如：第一码本为上述表3所示的码本，网络设备根据天线能力上报信息获知通信装置支持的同时用于上行传输的物理天线的数量为1，上所述表3所示的码本中预编码矩阵
Figure PCTCN2018081884-appb-000046
中包括一行非零元素，分别指示1根物理天线，则将
Figure PCTCN2018081884-appb-000047
Figure PCTCN2018081884-appb-000048
确定为多个第二预编码矩阵。此时，第二目标码本可如表6所示：
表6
Figure PCTCN2018081884-appb-000049
由于表3所示的原始的第一码本中索引0～15指示的预编码矩阵均为现有的预编码矩阵，其不能指示天线，索引16～23以及28～43指示的预编码矩阵均可指示两根物理天线，因此，索引0～15、16～23以及28～43指示的预编码矩阵均为限制终端选择的预编码矩阵，可称为第三预编码矩阵。由表6可知，表6所示的码本中的第二预编码矩阵在表3所示的码本中的索引与在表6所示的码本的索引不相同。
可以理解的是，表6所示的第二目标码本的形式为重新得到的缩小了的码本，此时，第二目标码本也可不为表6所示的形式，比如仍可为表3所示的形式，只是索引 0～15、16～23以及28～43指示的预编码矩阵具有限制通信装置选择的标记，或者，索引24～27指示的预编码矩阵具有不限制通信装置选择的标记。
该方法确定第二目标码本的过程比较简单。
b、网络设备根据通信装置支持的同时用于上行传输的物理天线的数量和上行信道信息，确定第一码本中不限制终端选择的多个第二预编码矩阵。可以理解的是，该方法对应的天线能力上报信息中指示的天线能力还至少包括通信装置支持的同时用于上行传输的物理天线的数量和通信装置的物理天线的数量。
比如：第一码本为上述表2所示的码本，网络设备根据天线能力上报信息获知通信装置支持的同时用于上行传输的物理天线的数量为1，上所述表3所示的码本中预编码矩阵
Figure PCTCN2018081884-appb-000050
中包括一行非零元素，分别指示1根物理天线；但是，网络设备根据先前的经验，可知根据
Figure PCTCN2018081884-appb-000051
得到的等效信道的系统性能不好，比如系统容量低于第一预设阈值和/或SINR低于第二预设阈值，此时，将
Figure PCTCN2018081884-appb-000052
中去掉，得到
Figure PCTCN2018081884-appb-000053
为多个第二预编码矩阵。
此时，第二目标码本可如表7所示：
表7
Figure PCTCN2018081884-appb-000054
由于表3所示的原始的第一码本中索引0～15指示的预编码矩阵均为现有的预编码矩阵，其不能指示天线，索引16～23以及28～43指示的预编码矩阵均可指示两根物理天线，根据索引25指示的预编码矩阵得到的等效信道的系统性能不好，因此，索引0～15、16～23、25以及28～43指示的预编码矩阵均为限制终端选择的预编码矩阵，可称为第三预编码矩阵。由表7可知，表7所示的码本中的第二预编码矩阵在表3所示的码本中的索引与在表7所示的码本的索引不相同。
可以理解的是，表7所示的第二目标码本的形式为重新得到的缩小了的码本，此时，第二目标码本也可不为表7所示的形式，比如仍可为表3所示的形式，只是索引 0～15、16～23、25以及28～43指示的预编码矩阵具有限制通信装置选择的标记，或者，索引24、26、27指示的预编码矩阵具有不限制通信装置选择的标记。
该方法确定第二目标码本的过程可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的。
c、网络设备根据通信装置支持的同时用于上行传输的物理天线，确定第一码本中不限制终端选择的多个第二预编码矩阵，具体为；将指示通信装置支持的同时用于上行传输的物理天线的多个预编码矩阵，确定为多个第二预编码矩阵。可以理解的是，该方法对应的天线能力上报信息中指示的天线能力还至少包括通信装置支持的同时用于上行传输的物理天线通信装置的物理天线的数量和通信装置支持的同时用于上行传输的物理天线通信装置的物理天线。
比如：第一码本为上述表3所示的码本，网络设备根据天线能力上报信息获知通信装置可通过物理天线0和物理天线2同时发送上行信息、物理天线1和物理天线3同时发送上行信息、物理天线0和物理天线3同时发送上行信息、物理天线1和物理天线2同时发送上行信息，那么
Figure PCTCN2018081884-appb-000055
Figure PCTCN2018081884-appb-000056
为多个第二预编码矩阵。此时，第二目标码本可如表8所示：
表8
Figure PCTCN2018081884-appb-000057
可以理解的是，表8所示的第二目标码本的形式为重新得到的缩小了的码本，此时，第二目标码本也可不为表8所示的形式，比如仍可为表3所示的形式，只是索引0～15、24～31以及32～35指示的预编码矩阵具有限制通信装置选择的标记，或者，索引16～23、36～43指示的预编码矩阵具有不限制通信装置选择的标记。
该方法确定第二目标码本的过程比较简单。
d、网络设备根据通信装置支持的同时用于上行传输的物理天线和上行信道信息，确定第一码本中不限制终端选择的多个第二预编码矩阵。可以理解的是，该方法对应 的天线能力上报信息中指示的天线能力还至少包括通信装置支持的同时用于上行传输的物理天线通信装置的物理天线的数量和通信装置支持的同时用于上行传输的物理天线通信装置的物理天线。
比如：第一码本为上述表3所示的码本，网络设备根据天线能力上报信息获知通信装置可通过物理天线0和物理天线2同时发送上行信息、物理天线1和物理天线3同时发送上行信息、物理天线0和物理天线3同时发送上行信息、物理天线1和物理天线2同时发送上行信息，那么根据通信装置能够发送上行信息的物理天线，得到
Figure PCTCN2018081884-appb-000058
Figure PCTCN2018081884-appb-000059
但是，网络设备根据先前的经验，可知根据
Figure PCTCN2018081884-appb-000060
得到的等效信道(等效信道的获取方法为上行信道矩阵与预编码矩阵相乘)的系统性能不好，比如系统容量低于第一预设阈值和/或SINR低于第二预设阈值，则将上述的
Figure PCTCN2018081884-appb-000061
去掉，
Figure PCTCN2018081884-appb-000062
Figure PCTCN2018081884-appb-000063
为多个第二预编码矩阵，此时，第二目标码本可如表9所示：
表9
Figure PCTCN2018081884-appb-000064
Figure PCTCN2018081884-appb-000065
可以理解的是，表9所示的第二目标码本的形式为重新得到的缩小了的码本，此时，第二目标码本也可不为表9所示的形式，比如仍可为表3所示的形式，只是索引0～15、16～19、24～31以及32～35指示的预编码矩阵具有限制通信装置选择的标记，或者，索引20～23、36～43指示的预编码矩阵具有不限制通信装置选择的标记。
该方法确定第二目标码本的过程可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的。
e、网络设备根据上行信道信息，确定第一码本中不限制终端选择的多个第二预编码矩阵。
若第一码本为表4所示的码本，网络设备根据先前的经验，可知根据索引3～5、9～17指示的预编码矩阵得到的等效信道的系统性能不好，比如系统容量低于第一预设阈值和/或SINR低于第二预设阈值，则将表4所示的码本3～5、9～17指示的预编码矩阵作为限制通信装置选择的多个第三预编码矩阵，0～2，6～8的预编码矩阵为不限制通信装置选择的多个第二预编码矩阵，根据表4中的索引0～2，6～8对应的预编码矩阵得到第二目标码本，如表10所示：
表10
Figure PCTCN2018081884-appb-000066
可以理解的是，表10所示的第二目标码本的形式为重新得到的缩小了的码本，此时，第二目标码本也可不为表10所示的形式，比如仍可为表4所示的形式，只是索引3～5、9～17指示的预编码矩阵具有限制通信装置选择的标记，或者，索引0～2，6～8指示的预编码矩阵具有不限制通信装置选择的标记。
综上可知，若第二目标码本为缩小了的码本，索引数量少，后续向通信装置指示第二目标预编码矩阵的索引时，占用的比特少，节省了网络开销。比如，表6所示的第二目标码本为缩小了的码本，其只具有索引0～3，这样在后续向通信装置指示第二目标预编码矩阵的索引时，只需占用2个比特，而原来的表3所示的码本在后续向通信装置指示第二目标预编码矩阵的索引时，需占用6个比特，因此，这样可以节省向通信装置指示第二目标预编码矩阵在第二目标码本的索引的网络开销。
该方法确定第二目标码本的过程可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的。
下面对从第二目标码本中确定第二目标预编码矩阵的方法进行说明。
网络设备根据通信装置的天线能力，或者，上行信道信息，从第二目标码本中获取第二目标预编码矩阵。
此处的，网络设备根据通信装置的天线能力，或者，上行信道信息，可以理解为：(1)网络设备仅根据通信装置的天线能力，(2)网络设备仅根据上行信道信息，(3)网络设备根据通信装置的天线能力和上行信道信息。
具体地，若第二目标码本的获取方法，为通过上述获取第二目标码本的第一种可能的实施方式获取的，也就是第二目标码本就是网络设备存储的原始的第一码本，则第二目标预编码矩阵的方法可采用如下五种可实现的实施方式：
第一种可实现的实施方式为：网络设备根据获知的通信装置支持的同时用于上行传输的物理天线的数量，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵，具体为：网络设备根据通信装置支持的同时用于上行传输的物理天线的数量，从能够指示该数量物理天线的多个预编码矩阵中任选一个，作为第二目标预编码矩阵。
比如：第二目标码本为上述表2所示的码本，网络设备根据天线能力上报信息获知通信装置支持的同时用于上行传输物理天线的数量为1，上所述表2所示的码本中预编码矩阵
Figure PCTCN2018081884-appb-000067
中包括一行非零元素，分别指示1根物理天线，则从
Figure PCTCN2018081884-appb-000068
Figure PCTCN2018081884-appb-000069
中任选一个作为第二目标预编码矩阵，比如选择了第一预编码矩阵
Figure PCTCN2018081884-appb-000070
那么第一预编码矩阵
Figure PCTCN2018081884-appb-000071
即为第二目标预编码矩阵。
第一种可实现的实施方式，确定第二目标预编码矩阵的过程简单。
第二种可实现的实施方式为：网络设备根据获知的通信装置支持的同时用于上行传输的物理天线的数量和上行信道信息，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵，具体为：网络设备根据通信装置支持的同时用于上行传输的物理天线的数量，从第二目标码本中确定能够指示该数量物理天线的多个第四预编码矩阵，根据上行信道信息，从多个第四预编码矩阵中确定第二目标预编码矩阵。
比如：第二目标码本为上述表2所示的码本，网络设备根据天线能力上报信息获知通信装置可同时发送上行信息的物理天线的数量为1，上所述表2所示的码本中预 编码矩阵
Figure PCTCN2018081884-appb-000072
中包括一行非零元素，分别指示1根物理天线，则
Figure PCTCN2018081884-appb-000073
Figure PCTCN2018081884-appb-000074
为多个第四预编码矩阵；接着根据上行信道信息，将上行信道矩阵与
Figure PCTCN2018081884-appb-000075
Figure PCTCN2018081884-appb-000076
分别相乘，得到4个等效信道，哪个等效信道矩阵对应的系统性能最好，则该等效信道矩阵对应的预编码矩阵便为第二目标预编码矩阵；其中，系统性能包括系统容量，信干噪比(Signal to Inference plus Noise Ratio，简称SINR)等。若预编码矩阵
Figure PCTCN2018081884-appb-000077
与上行信道矩阵相乘，得到的等效信道矩阵对应的系统性能最好，那么预编码矩阵
Figure PCTCN2018081884-appb-000078
即为第二目标预编码矩阵。
第二种可实现的实施方式，由于每根物理天线对应的子信道有可能不相同，每个子信道的信道质量也并不相同，第二种实施方式中根据了上行信道信息来确定第二目标预编码矩阵，也就是将预选的各预编码矩阵分别与上行信道矩阵相乘，得到等效信道矩阵，哪个等效信道矩阵对应的系统性能最好，则该等效信道矩阵对应的预编码矩阵便为第二目标预编码矩阵。如前所述―每一行与哪根物理天线对应，上行信道矩阵中的相应列的冲激响应就是根据哪根物理天线发射的SRS得到的‖，可知，第二目标预编码矩阵与上行信道矩阵相乘，得到等效信道矩阵是第二目标预编码矩阵指示的物理天线对应的信道，那么采用第二目标预编码矩阵指示目标物理天线发送上行信息可以使得系统性能最好，也就是说可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的。
第三种可实现的实施方式为：网络设备根据获知的通信装置支持的同时用于上行传输的物理天线，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵，具体为：网络设备根据能够用于发送上行信息的物理天线，从指示能够用于发送上行信息的物理天线的多个预编码矩阵中任选一个预编码矩阵，作为第二目标预编码矩阵。
比如：第二目标码本为上述表2所示的码本，网络设备根据天线能力上报信息获知通信装置支持的同时用于上行传输的物理天线为物理天线0或物理天线1或物理天线2或物理天线3，即可从物理天线0、物理天线1、物理天线2、物理天线3中选择 一个物理天线进行上行信息的发送，其中，如上所述表2所示的码本中
Figure PCTCN2018081884-appb-000079
可指示物理天线0、
Figure PCTCN2018081884-appb-000080
可指示物理天线1、
Figure PCTCN2018081884-appb-000081
可指示物理天线2、
Figure PCTCN2018081884-appb-000082
可指示物理天线3，网络设备可从第一预编码矩阵
Figure PCTCN2018081884-appb-000083
中任选一个作为第二目标预编码矩阵，比如选择了第一预编码矩阵
Figure PCTCN2018081884-appb-000084
那么第一预编码矩阵
Figure PCTCN2018081884-appb-000085
即为第二目标预编码矩阵。
第三种可实现的实施方式，确定第二目标预编码矩阵的过程简单。
第四种可能的实施方式，网络设备根据通信装置支持的同时用于上行传输的物理天线和上行信道信息，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵。
比如：第二目标码本可为上述表2所示的码本，网络设备根据天线能力上报信息获知通信装置可用于发送上行信息的物理天线为：物理天线0和物理天线2的组合(0,2)、物理天线1和物理天线3的组合(1,3)，即可采用物理天线0和物理天线2同时发送上行信息，也可采用物理天线1和物理天线3同时发送上行信息，其中，如上所述表2所示的码本中
Figure PCTCN2018081884-appb-000086
可指示物理天线0和物理天线2的组合；
Figure PCTCN2018081884-appb-000087
可指示物理天线1和物理天线3的组合；接着，根据上行信道信息，从第一预编码矩阵
Figure PCTCN2018081884-appb-000088
Figure PCTCN2018081884-appb-000089
中选一个作为第二目标预编码矩阵，具体方法为：网络设备将上行信道矩阵分别与上述八个第一预编码矩阵相乘，得到八个等效信道矩阵，哪个等效信道矩阵对应的系统性能最好，则该等效信道矩阵对应的第一预编码矩阵便为第 二目标预编码矩阵；其中，系统性能包括系统容量，信干噪比(Signal to Inference plus Noise Ratio，简称SINR)等。若第一预编码矩阵
Figure PCTCN2018081884-appb-000090
与上行信道矩阵相乘，得到的等效信道矩阵对应的系统性能最好，那么第一预编码矩阵
Figure PCTCN2018081884-appb-000091
即为第二目标预编码矩阵。
进一步地，为了减少计算量，加快获取第二目标预编码矩阵的速度，网络设备可根据先前的经验，比如根据上述八个第一预编码矩阵中的
Figure PCTCN2018081884-appb-000092
预编码矩阵得到的等效信道的系统性能比较差，比如系统容量低于第一预设阈值和/或SINR低于第二预设阈值，则只需将上行信道矩阵分别与剩余的6个预编码矩阵
Figure PCTCN2018081884-appb-000093
Figure PCTCN2018081884-appb-000094
进行相乘，获取第二目标预编码矩阵。
第四种实施方式，一是可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的，还具有选择的目标物理天线比较准确的优点。
第五种可能的实施方式中，网络设备根据上行信道信息，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵。
具体地，若第二目标码本可为上述表3所示的码本，根据上行信道信息，从第二目标码本中确定第二目标预编码矩阵的具体实现可如下：
网络设备根将上行信道矩阵分别与表3中的18个第一预编码矩阵相乘，得到18个等效信道矩阵，哪个等效信道矩阵对应的系统性能最好，则该等效信道矩阵对应的第一预编码矩阵便为第二目标预编码矩阵；其中，系统性能包括系统容量，SINR等。若第一预编码矩阵
Figure PCTCN2018081884-appb-000095
与上行信道矩阵相乘，得到的等效信道矩阵对应的系统性能最好，那么第一预编码矩阵
Figure PCTCN2018081884-appb-000096
即为第二目标预编码矩阵。
当然，为了减少计算量，加快获取第二目标预编码矩阵的速度，网络设备可根据先前的经验，比如采用某几个预编码矩阵的得到的等效信道的系统性能比较差，比如系统容量低于第一预设阈值和/或SINR低于第一阈值，则将这样的预编码矩阵组成A组，第二目标码本中剩余的预编码矩阵组成B组，A组为限制终端进行选择的组，B组为不限制终端进行选择的组。那么只需将上行信道矩阵分别与B组中的各预编码矩阵进行相乘，获取第二目标预编码矩阵。
第五种可能的实施方式，可以实现选择使得系统性能较好的目标物理天线发送上行信息的目的。
若第二目标码本的获取方法，为通过上述获取第二目标码本的第二种可能的实施方式获取的，也就是第二目标码本是缩小后的码本或者是具有限制通信装置选择或不限制通信装置选择的标记的码本，则第二目标预编码矩阵的方法可采用如下四种可实现的实施方式：
第一种可实现的实施方式为：从第二目标码本包括的多个预编码矩阵中任选一个，作为第二目标预编码矩阵。
第二种可实现的实施方式为：若获取第二目标码本的方法为上述e中的方法，网络设备根据获知的通信装置支持的同时用于上行传输的物理天线的数量，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵，具体为：网络设备根据通信装置支持的同时用于上行传输的物理天线的数量，从第二目标码本中能够指示该数量物理天线的预编码矩阵中任选一个，作为第二目标预编码矩阵；或者，
网络设备根据获知的通信装置支持的同时用于上行传输的物理天线的数量和上行信道信息，从第二目标码本包括的多个预编码矩阵中确定第二目标预编码矩阵，具体为：
网络设备根据获知的通信装置支持的同时用于上行传输的物理天线的数量从第二目标码本包括的多个预编码矩阵中确定多个第四预编码矩阵，确定上行信道矩阵与第四预编码矩阵相乘后得到的等效信道的系统性能最好的四预编码矩阵为第二目标预编码矩阵。
第三种可实现的实施方式为：若获取第二目标码本的方法为上述a～b和e任一中的方法，网络设备根据获知的通信装置支持的同时用于上行传输的物理天线，从第二目标码本包括的多个预编码矩阵中确定第二目标预编码矩阵，具体为：网络设备从第二目标码本中能够指示通信装置支持的同时用于上行传输的物理天线的预编码矩阵中任选一个预编码矩阵，作为第二目标预编码矩阵；或者，
网络设备根据获知的通信装置支持的同时用于上行传输的物理天线从第二目标码本包括的多个预编码矩阵中确定多个第四预编码矩阵，确定上行信道矩阵与第四预编码矩阵相乘后得到的等效信道的系统性能最好的第四预编码矩阵为第二目标预编码矩阵。
第四种可实现的实施方式为：若获取第二目标码本的方法为上述a～e中任一的方法，网络设备根据上行信道信息，从第二目标码本包括的多个第一预编码矩阵中确定第二目标预编码矩阵，具体为：将上行信道矩阵分别与第二目标码本中的多个预编码 矩阵相乘，得到多个等效信道矩阵，确定系统性能最好的等效信道矩阵对应的预编码矩阵为第二目标预编码矩阵。
对于步骤S205、网络设备在确定了上行传输的层数和第二目标预编码矩阵后，将上行传输的层数和第二目标预编码矩阵在第二目标码本中的索引，发送至通信装置。
其中，上行传输的层数和上述索引可通过下行控制信息(Downlink Control Information，简称DCI)发送至通信装置，即网络设备发送DCI至通信装置，DCI包括上行传输的层数和第二目标预编码矩阵在第二目标码本中的索引。其中，上行传输的层数的指示信息可占用DCI信息的第一字段，上述索引的指示信息可占用DCI信息的第二字段，此时，上述的第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数独立编码。
此外，上述第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数还可联合编码，采用同一指示信息进行指示，占用DCI信息的一个字段；也就是上行传输的层数和预编码矩阵的索引的每种组合定义一个组合索引，指示信息指示的是网路设备确定的上行传输的层数和第二目标预编码矩阵的索引这一组合对应的组合索引。
对于步骤S206、若上行传输的层数和第二目标预编码矩阵在第二目标码本中的索引通过DCI发送至通信装置，通信装置接收到DCI，解析后获取到上行传输的层数和预编码矩阵的索引。
通信装置根据上行传输的层数和通信装置包括的物理天线的数量，确定第一目标码本。本领域技术人员可以理解的是，第一目标码本与第二目标码本是相同的，第一目标码本为在通信装置存储的码本，第二目标码本为在网络设备存储的码本。
将第一目标码本中多个预编码矩阵中该索引对应的预编码矩阵确定为第一目标预编码矩阵，第一目标预编码矩阵和第二目标预编码矩阵是相同的。
可以理解的是，若第二目标码本为在网络设备侧存储的与上行传输的层数和通信装置包括的物理天线的数量对应的原始的码本，则第一目标码本也为在通信装置侧存储的与上行传输的层数和通信装置包括的物理天线的数量对应的原始的码本。
比如，若上行传输的层数为1，通信装置的物理天线的数量为4，第一目标码本也为如表2所示的码本，与网络设备根据确定的上行传输的层数为1，通信装置上报的其具有4根物理天线时确定的第二目标码本是一样的。
确定了第一目标码本为如表2所示的码本后，若通信装置获取到的索引为0时，则第一目标预编码矩阵为
Figure PCTCN2018081884-appb-000097
可以理解的是，若第二目标码本通过上述获取第二目标码本的第二种可实现实施方式获取到的，即第二目标码本不是网络设备存储的原始的第一码本，则第一目标码本也不是通信装置存储的原始的第一码本。下面对该种情况下第一目标码本的获取方法进行说明。
通信装置可以在接收网络设备向通信装置发送的第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数之前，先获取第一目标码本，还可以在通信装置接收 到网络设备发送的第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数之前，获取第一目标码本。
对于“通信装置可以在接收网络设备向通信装置发送的第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数之前，获取第一目标码本”对应的第一目标码本的确定方法，可通过以下两种但不限于该两种可实现的方式实现。
第一种可实现的方式为：通信装置根据通信装置的天线能力和至少一个第一码本，获取至少一个目标码本，根据上行传输的层数和终端设备的物理天线的数量，从至少一个目标码本中，确定第一目标码本。
此时，第一码本为通信装置侧存储的与通信装置的天线能力对应的码本，比如，若通信装置支持1T4R，则第一码本只有1个，可为表2所示的码本，若通信装置支持2T4R，则第一码本具有2个，表2和表4所示的码本。
如上所述，天线的能力包括：通信装置支持的同时用于上行传输的物理天线的数量和/或通信装置支持的同时用于上行传输的物理天线。
若上述网络设备侧根据通信装置支持的同时用于上行传输的物理天线的数量和第一码本，获取第二目标码本(即上述a对应的方法)，则对于每个第一码本，通信装置也是根据通信装置支持的同时用于上行传输的物理天线的数量和第一码本获取该第一码本对应的目标码本，每个目标码本的获取方式与第二目标码本的获取方式相同。
若上述网络设备侧通信装置支持的同时用于上行传输的物理天线和第一码本，获取第二目标码本(即上述c对应的方法)，则对于每个第一码本，通信装置也是根据通信装置支持的同时用于上行传输的物理天线和第一码本获取该第一码本对应的目标码本，每个目标码本的获取方式与第二目标码本的获取方式相同。
根据上行传输的层数，从至少一个目标码本中确定第一目标码本，也就是若目标码本具有多个，目标码本中预编码矩阵的列与上行传输的层数相同的目标码本便为第一目标码本。
该种可实现的方式，通信装置无需与网络设备进行交互，便可获取第一目标码本，网络开销小。
第二种可实现的方式为：网络设备向通信装置发送第一指示信息，通信装置在接收到第一指示信息后，根据第一指示信息和通信装置存储的每个码本，获取至少一个目标码本；根据上行传输的层数和终端设备的物理天线的数量，从至少一个目标码本中，确定第一目标码本。
其中，第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵；或者，第一指示信息用于指示第一码本中不用于获取第一目标码本的预编码矩阵；或者，第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵组，预编码矩阵组包括第一码本中用于获取第一目标码本的预编码矩阵；或者，、第一指示信息用于指示第一码本中不用于获取第一目标码本的预编码矩阵组，预编码矩阵组包括第一码本中不用于获取第一目标码本的预编码矩阵。
上述第一指示信息之间的“或者”含义，使得第一指示信息具有如下形式：
(1)第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵；
(2)第一指示信息用于指示第一码本中不用于获取第一目标码本的预编码矩阵；
(3)第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵和不用于获取第一目标码本的预编码矩阵；
(4)第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵组，预编码矩阵组包括第一码本中用于获取第一目标码本的预编码矩阵；
(5)第一指示信息用于指示第一码本中不用于获取第一目标码本的预编码矩阵组，预编码矩阵组包括第一码本中不用于获取第一目标码本的预编码矩阵；
(6)第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵组和不用于获取第一目标码本的预编码矩阵组。
本领域技术人员可以理解的是，网络设备还会将指示第一预编码矩阵组包括哪些预编码矩阵的信息和/或指示第二预编码矩阵组包括哪些预编码矩阵的信息发送至通信装置。
对于“通信装置可以在接收网络设备向通信装置发送的第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数之后，获取第一目标码本”对应的第一目标码本的确定方法，可通过以下四种但不限于该四种可实现的方式实现。
第一目标码本的获取方法可通过以下四种但不限于该四种可实现的方式实现。
第一种可实现的方式为：通信装置在接收到上行传输的层数后，获取与上行传输的层数和通信装置的物理天线的数量对应的第一码本，根据通信装置的天线能力和第一码本，获取第一目标码本，第一目标码本是第一码本的子集。
如上所述，天线的能力包括：通信装置支持的同时用于上行传输的物理天线的数量和/或通信装置支持的同时用于上行传输的物理天线。
此时，若上述网络设备侧根据通信装置支持的同时用于上行传输的物理天线的数量和第一码本，获取第二目标码本(即上述a对应的方法)，则通信装置也是根据通信装置支持的同时用于上行传输的物理天线的数量和第一码本获取第一目标码本，获取方式与第二目标码本的获取方式相同。
若上述网络设备侧通信装置支持的同时用于上行传输的物理天线和第一码本，获取第二目标码本(即上述c对应的方法)，则通信装置也是根据通信装置支持的同时用于上行传输的物理天线和第一码本获取第一目标码本，获取方式与第二目标码本的获取方式相同。
该种可实现的方式，通信装置无需与网络设备进行交互，便可获取第一目标码本，网络开销小。
第二种可实现的方式为：通信装置接收到上行传输的层数后，获取与上行传输的层数和通信装置的物理天线的数量对应的第一码本，根据第一码本和第一指示信息，得到第一目标码本，第一目标码本是第一码本的子集。
具体地，在网络设备确定了不限制通信装置选择的第一码本中多个第二预编码矩阵后(第一码本为网络设备存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本，多个第二预编码矩阵详见上述获取的方法)，会向通信装置发送第一指示信息，其中，第一指示信息同上述的第一指示信息，此处不再赘述。
其中，第一指示信息可通过无线资源控制(Radio Resource Control，简称RRC)信令下发至通信装置，第一指示信息可在网络设备确定好第一码本之后、向通信装置发送第二预编码矩阵在第二目标码本中的索引和上行传输的层数之前，下发至通信装置。比如如上所述，第一码本为上述表3所示的码本，网络设备根据天线能力上报信息获知通信装置支持的同时用于上行传输的物理天线的数量确定索引24～27各自对应的
Figure PCTCN2018081884-appb-000098
为多个第二预编码矩阵。
若第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵，和/或第一码本中不用于获取第一目标码本的预编码矩阵时，RRC信令中可包括bitmap信息，此时，该bitmap可具有40个比特，分别指示表3中所示的第一码本中的40个预编码矩阵是否被限制选择，该bitmap信息的形式可为0000000000000000000000001111000000000000，其中前24个0依次指示表3中所示的第一码本的索引0～23对应的各预编码矩阵限制通信装置选择，即索引0～23对应的各预编码矩阵不用于获取第一目标码本，第25位至第28位的―1‖依次指示表3中所示的第一码本的索引24～27对应的各预编码矩阵不限制通信装置选择，即索引24～27对应的各预编码矩阵用于获取第一目标码本，第26位至第40位的―0‖依次指示表3中所示的第一码本的索引28～39对应的各预编码矩阵限制通信装置选择，即索引28～39对应的各预编码矩阵不用于获取第一目标码本。
bitmap信息除了上述形式，bitmap信息可包括第一码本的索引24～27的指示信息，或者索引0～23、索引28～39的指示信息。
通信装置在接收到上行传输的层数之后，获取通信装置存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本，此处也可称为第一码本，因为通信装置存储的物理天线的数量对应的原始的码本与网络设备存储的物理天线的数量对应的原始的码本是一致的。
通信装置根据网络设备发送的第一指示信息中指示的用于获取第一目标码本的多个第二预编码矩阵得到第一目标码本，比如若通信装置存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本(第一码本)为表3所示的码本，多个第二预编码矩阵是网络设备根据通信装置支持的同时用于上行传输的物理天线的数量确定的，通信装置支持的同时用于上行传输的物理天线的数量为1，此时的第一目标码本的形式如上述的表6所示。
若第一指示信息用于指示第一码本中用于获取第一目标码本的预编码矩阵组，和/或，第一码本中不用于获取第一目标码本的预编码矩阵组，此时，网络设备会将多个第二预编码矩阵组成第一预编码矩阵组，将第一码本除了多个第二预编码矩阵的多个第三预编码矩阵组成第二预编码矩阵组，即第一预编码矩阵组为用于获取第一目标码本的组，第二预编码矩阵组为不用于获取第一目标码本的组。
此时，第一指示信息可包括两个比特，一个比特用于指示第一预编码矩阵组是否 用于获取第一目标码本，另一个比特用于指示第二预编码矩阵组是否用于获取第一目标码本，比如第二指示信息的形式可为―10‖，―1‖指示第一预编码矩阵组包括的各预编码矩阵用于获取第一目标码本，即指示第一预编码矩阵组用于获取第一目标码本；―0‖指示第二预编码矩阵组包括的各预编码矩阵不用于获取第一目标码本，即指示第二预编码矩阵组不用于获取第一目标码本。
第一指示信息除了上述方式，第一指示信息可仅包括第一预编码矩阵组的索引的指示信息，或，第一指示信息仅包括第二预编码矩阵组的索引的指示信息。
本领域技术人员可以理解的是，网络设备还会将指示第一预编码矩阵组包括哪些预编码矩阵的信息和/或指示第二预编码矩阵组包括哪些预编码矩阵的信息发送至通信装置。
通信装置根据网络设备发送的第一指示信息中指示的用于获取第一目标码本的第一预编码矩阵组包括的多个第二预编码矩阵得到第一目标码本，比如若通信装置存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本(第一码本)为表3所示的码本，多个第二预编码矩阵是网络设备根据通信装置支持的同时用于上行传输的物理天线确定的，且通信装置可通过物理天线0和物理天线2同时发送上行信息、物理天线0和物理天线3同时发送上行信息，物理天线1和物理天线2同时发送上行信息，此时的第一目标码本的形式如上述的表8所示。
第三种可实现的方式为：在网络设备确定了不限制通信装置选择的第一码本中多个第二预编码矩阵后(第一码本为网络设备存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本)，将多个第二预编码矩阵组成第一预编码矩阵组，将第一码本除了多个第二预编码矩阵的多个第三预编码矩阵组成第二预编码矩阵组，即第一预编码矩阵组为用于获取第一目标码本的组，第二预编码矩阵组为不用于获取第一目标码本的组。
如上所述，网络设备可通过DCI向通信装置发送第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数，即：网络设备发送DCI至通信装置，DCI包括第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数。此时，网络设备可建立第一码本包括的各预编码矩组与DCI所占用的时域的编号的奇偶性之间的对应关系，比如第一预编码矩组DCI所占用的时域的奇数编号对应、第二预编码矩组与DCI所占用的时域的偶数编号对应；或者，第一预编码矩组与DCI所占用的时域的偶数编号对应、第二预编码矩组与DCI所占用的时域的奇数编号对应。
接着，网络设备向通信装置发送第三指示信息，第三指示信息用于指示第一码本包括的各预编码矩组与DCI所占用的时域的编号的奇偶性之间的对应关系。网络设备还会将指示第一预编码矩阵组包括哪些预编码矩阵的信息和/或指示第二预编码矩阵组包括哪些预编码矩阵的信息发送至通信装置。
其中，若第一预编码矩组与DCI所占用的时域的奇数编号对应，此时，网络设备在编号为奇数的时域上向通信装置发送DCI。
此时，通信装置会在编号为奇数的时域上获取到DCI，则通信装置根据第三指示信息中指示的第一码本的与DCI所占用的时域的奇数编号对应的第一预编码矩阵组包 括的各预编码矩阵，得到第一目标码本。
其中，若第一预编码矩组与DCI所占用的时域的偶数编号对应，此时，网络设备在编号为偶数的时域上向通信装置发送DCI。
此时，通信装置会在编号为偶数的时域上获取到DCI，则通信装置根据第三指示信息中指示的第一码本的与DCI所占用的时域的偶数编号对应的第一预编码矩阵组包括的各预编码矩阵，得到第一目标码本。
第四种可实现的方式为：在网络设备确定了不限制通信装置选择的第一码本中多个第二预编码矩阵后(第一码本为网络设备存储的与上行传输的层数且与通信装置的物理天线的数量对应的原始的码本)，将多个第二预编码矩阵组成第一预编码矩阵组，将第一码本除了多个第二预编码矩阵的多个第三预编码矩阵组成第二预编码矩阵组，即第一预编码矩阵组为用于获取第一目标码本的组，第二预编码矩阵组为不用于获取第一目标码本的组。
网络设备发送DCI至通信装置，DCI包括第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数，则建立第一码本包括的各预编码矩阵组与各CRC掩码组组之间的对应关系；比如第一预编码矩组与第一CRC掩码组对应、第二预编码矩组与第二CRC掩码组对应，或者，第一预编码矩组与第二CRC掩码组对应、第二预编码矩组与第一CRC掩码组对应。其中，CRC掩码组至少包括一个CRC掩码。
接着，向通信装置发送第四指示信息，第四指示信息用于指示第一码本包括的各预编码矩组与各CRC掩码组之间的对应关系。网络设备还会将指示第一预编码矩阵组包括哪些预编码矩阵的信息和/或指示第二预编码矩阵组包括哪些预编码矩阵的信息发送至通信装置，以及将指示第一CRC掩码组包括哪些CRC掩码和/或第二CRC掩码组包括哪些CRC掩码发送至通信装置。
其中，若第一预编码矩组与第一CRC掩码组对应时，网络设备发送至通信装置的DCI的掩码为第一CRC掩码组中的掩码。
此时，通信装置解析DCI后得到的CRC掩码为第一CRC掩码组中的掩码，则通信装置根据第四指示信息中指示的与第一CRC掩码组对应的第一预编码矩阵组包括的各预编码矩阵，得到第一目标码本。
若第一预编码矩组与第二CRC掩码组对应时，网络设备发送至通信装置的DCI的掩码为第二CRC掩码组中的掩码。
此时，通信装置解析DCI后得到的CRC掩码为第二CRC掩码组中的掩码，则通信装置根据第四指示信息中指示的与第二CRC掩码组对应的第一预编码矩阵组包括的各预编码矩阵，得到第一目标码本。
对于步骤S207、通信装置根据多个第一预编码矩阵中上述索引对应的第一目标预编码矩阵，确定通信装置用于发送上行信息的目标物理天线；第一目标预编码矩阵和第二目标预编码矩阵相同。
具体地，通信装置接收到上述索引后，步骤S206中确定的第一目标码本中的该索引对应的预编码矩阵便为第一目标预编码矩阵。
如前所述，第二目标码本与第一目标码本相同，由于第一目标预编码矩阵和第二 目标预编码矩阵对应的索引相同，那么第一目标预编码矩阵和第二目标预编码矩阵也相同。
如上所述，若第一目标预编码矩阵为
Figure PCTCN2018081884-appb-000099
其指示的天线为物理天线0，则确定通信装置用于发送上行信息的目标物理天线为物理天线0。若第一目标预编码矩阵为
Figure PCTCN2018081884-appb-000100
其指示的天线为物理天线0和物理天线2，则确定通信装置用于发送上行信息的目标物理天线为物理天线0和物理天线2同时完成一个数据流的传输。
进一步地，若PUSCH被配置为4天线端口，且通信装置具有4根物理天线，此时，天线端口与物理天线可具有一一映射的关系，比如天线端口0映射物理天线0，天线端口1映射物理天线1，天线端口2映射物理天线2，天线端口3映射物理天线3。此时，若通信装置选择了物理天线0进行上行信息的发送，则上行信息对应的天线端口为天线端口0。
若PUSCH被配置为2天线端口，且通信装置具有4根物理天线，此时，一个天线端口可映射两根物理天线，比如天线端口0映射物理天线0和物理天线1，天线端口1映射物理天线2和物理天线3。此时，若通信装置选择了物理天线0和物理天线2进行上行信息的发送，则上行信息所对应的天线端口为天线端口0和天线端口1，若通信装置选择了物理天线0和物理天线1进行上行信息的发送，则上行信息所对应的天线端口为天线端口0。
本实施例的上行传输的信息可为在PUSCH上发送的数据，此时，本实施例是针对PUSCH进行的天线选择。
本实施例中通过码本的至少部分预编码矩阵可以指示通信装置的物理天线，网络设备根据通信装置支持的天线能力和/或上行信道信息获取第二目标预编码矩阵，并将该第二目标预编码矩阵的索引指示发送至通信装置，通信装置根据该索引，可从终端侧存储的码本中确定该索引对应第一目标预编码矩阵，第一目标预编码矩阵和第二目标预编码矩阵相同，第一目标预编码矩阵指示的物理天线即为确定的通信装置用于发送上行信息的目标物理天线，实现了支持不同天线能力的多种通信装置的上行天线的选择；而且，若第二目标预编码矩阵是网络设备根据上行信道信息确定的，保证了通信装置采用目标物理天线发送上行信息时，系统的性能最好，也就是可以使得通信装置能够选择使得系统性能最好的目标物理天线发送上行信息。
图3为本申请实施例提供的上行天线的选择方法的信令流程图二，参见图3，本实施例的方法包括：
步骤S301、网络设备确定上行传输的层数和通信装置的物理天线的数量；
步骤S302、网络设备根据上行传输的层数和通信装置的物理天线的数量，确定第二目标预编码矩阵；
步骤S303、网络设备向通信装置发送第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数；
步骤S304、通信装置根据上行传输的层数和通信装置包括的物理天线的数量，确定第一目标码本；第一目标码本和第二目标码本相同，第一目标码本包括多个第一预编码矩阵；
步骤S305、通信装置根据多个第一预编码矩阵中上述索引对应的第一目标预编码矩阵，确定通信装置用于发送上行信息的目标物理天线，第一目标预编码矩阵和第二目标预编码矩阵相同；
具体地，本实施中的步骤S301和步骤S302为网络设备根据通信装置发送的多个信息确定上行传输的层数和第二目标预编码矩阵的过程，具体实现参见上一实施例中的步骤S201～步骤S204涉及的内容。
步骤S303为网络设备向通信装置发送第二目标预编码矩阵在第二目标码本中的索引和上行传输的层数的过程，具体实现参见上一实施例中的步骤S205。
步骤S304为通信装置确定第一目标预编码矩阵的过程，具体实现参见上一实施例中的步骤S206。
步骤S305为通信装置确定发送上行信息的目标物理天线的过程，具体实现参见上一实施例中的步骤S207。
本实施例的上行天线的选择方法，实现了支持不同天线能力的多种通信装置的上行天线的选择；而且，若第二目标预编码矩阵是网络设备根据上行信道信息确定的，保证了通信装置采用目标物理天线发送上行信息时，系统的性能最好，也就是可以使得通信装置能够选择使得系统性能最好的目标物理天线发送上行信息。
上述针对网络设备和通信装置所实现的功能，对本申请实施例提供的方案进行了介绍。可以理解的是，网络设备和通信装置为了实现上述各自的功能，其包含了执行各个功能相应的硬件结构和/或软件模块。结合本申请中所公开的实施例描述的各示例及步骤，本申请实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。本领域技术人员可以对每个特定的应用来使用不同的方法来实现所描述的功能，但是这种实现不应认为超出本申请实施例的技术方案的范围。
本申请实施例可以根据上述方法示例对网络设备和通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。
图4为本申请提供的通信装置的结构示意图一，包括处理器21和通信总线22，处理器21用于调用存储器中存储的程序指令，以实现上述方法实施例中的方法，存储器为通信装置外部的存储器。
图5为本申请提供的通信装置的结构示意图二，包括处理器31、存储器32和通信总线33，处理器31用于调用32存储器中存储的程序指令，以实现上述方法实施例中的方法。
图4和图5所示的通信装置可以是通信装置本身，也可以是通信装置内的芯片，所述通信装置或所述芯片具有实现上述方法实施例中的方法的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的单元。
上述提到的处理器可以是一个中央处理器(central processing unit，CPU)、微处理器或专用集成电路(application specific integrated circuit，ASIC)，也可以是一个或多个用于控制上述各方面或其任意可能的设计的上行信息的传输方法的程序执行的集成电路。
本申请还提供一种计算机存储介质，包括指令，当所述指令在通信装置上运行时，使得通信装置执行上述方法实施例中相应的方法。
本申请还提供一种计算机存储介质，包括指令，当所述指令在通信装置上运行时，使得网络设备执行上述方法实施例中相应的方法。
以上所述，仅为本申请的具体实施方式，但本申请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申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (35)

  1. 一种上行天线的选择方法，其特征在于，包括：
    从网络设备接收预编码矩阵的索引和上行传输的层数；
    根据所述层数和通信装置的物理天线的数量，确定第一目标码本，所述第一目标码本包括多个第一预编码矩阵；
    根据所述多个第一预编码矩阵中所述索引对应的第一目标预编码矩阵，确定所述通信装置用于发送上行信息的目标物理天线。
  2. 根据权利要求1所述的方法，其特征在于，所述第一预编码矩阵的行与所述通信装置的物理天线一一对应；
    其中，所述第一预编码矩阵中包括非零元素的行对应的物理天线为用于发送上行信息的物理天线。
  3. 根据权利要求2所述的方法，其特征在于，
    1≤所述第一预编码矩阵中包括非零元素的行的数量≤所述通信装置支持的同时用于上行传输的物理天线的数量。
  4. 根据权利要求1～3任一所述的方法，其特征在于，所述第一预编码矩阵的列数与所述层数相同。
  5. 根据权利要求4所述的方法，其特征在于，所述第一预编码矩阵的归一化系数为所述第一预编码矩阵中非零元素的平方和的平方根的倒数。
  6. 根据权利要求1～5任一所述的方法，其特征在于，所述第一预编码矩阵满足预设条件，所述预设条件为
    Figure PCTCN2018081884-appb-100001
    或者，所述预设条件为
    Figure PCTCN2018081884-appb-100002
    其中，W为所述第一预编码矩阵，W T为所述第一预编码矩阵的共轭转置矩阵，
    Figure PCTCN2018081884-appb-100003
    为对角矩阵，
    Figure PCTCN2018081884-appb-100004
    为对角矩阵。
  7. 根据权利要求1～6任一所述的方法，其特征在于，当所述层数为1且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
    Figure PCTCN2018081884-appb-100005
    Figure PCTCN2018081884-appb-100006
  8. 根据权利要求1～6任一所述的方法，其特征在于，当所述层数为2且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
    Figure PCTCN2018081884-appb-100007
  9. 根据权利要求1～6任一所述的方法，其特征在于，当所述层数为1且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
    Figure PCTCN2018081884-appb-100008
  10. 根据权利要求1～6任一所述的方法，其特征在于，当所述层数为2且所述通信装置的物理天线的数量为4时，所述第一目标码本包括：
    Figure PCTCN2018081884-appb-100009
    Figure PCTCN2018081884-appb-100010
  11. 权利要求1-10任一所述的方法，其特征在于，所述方法还包括：
    向所述网络设备发送天线能力上报信息，所述天线能力上报信息用于指示所述通信装置的天线能力，所述通信装置的天线能力包括：
    所述通信装置支持闭环天线选择；或者，
    所述通信装置包括的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线。
  12. 据权利要求1-11任一所述的方法，其特征在于，所述第一目标码本是第一码本的子集；
    所述方法还包括：
    根据所述通信装置的天线能力和所述第一码本获取所述第一目标码本；
    其中，所述通信装置的天线能力包括：
    所述通信装置支持闭环天线选择；或者，
    所述通信装置包括的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线。
  13. 根据权利要求1-11任一所述的方法，其特征在于，所述第一目标码本是第一码本的子集；
    所述方法还包括：
    从所述网络设备接收第一指示信息；
    根据所述第一指示信息获取所述第一目标码本。
  14. 根据权利要求13所述的方法，其特征在于，
    所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中不用于获取所述第一目标码本的预编码矩阵。
  15. 根据权利要求1-11任一所述的方法，其特征在于，所述第一目标码本是第一码本的子集；
    所述从网络设备接收预编码矩阵的索引包括：从所述网络设备接收下行控制信息DCI，所述DCI包括所述预编码矩阵的索引；
    所述根据所述层数和通信装置包括的物理天线的数量确定第一目标码本包括：
    根据所述层数和所述通信装置包括的物理天线的数量确定第一码本；
    根据所述DCI所占用的时域获取所述第一目标码本；其中，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组，若所述DCI所占用的时域的编号为奇数时，所述第一预编矩阵组用于获取所述第一目标码本，或者若所述DCI所占用的时域的编号为偶数时，所述第二预编码矩阵组用于获取所述第一目标码本。
  16. 根据权利要求1-11任一所述的方法，其特征在于，所述第一目标码本是第一码本的子集；
    所述从网络设备接收预编码矩阵的索引包括：从所述网络设备接收下行控制信息DCI，所述DCI包括所述预编码矩阵的索引；
    所述根据所述层数和通信装置包括的物理天线的数量确定第一目标码本包括：
    根据所述层数和所述通信装置包括的物理天线的数量确定第一码本；
    根据所述DCI的掩码获取所述第一目标码本；其中，所述第一码本包括第一预编 码矩阵组和第二预编码矩阵组，若所述DCI的掩码为第一掩码时，所述第一预编码矩阵组用于获取所述第一目标码本，或者若所述DCI的掩码为第二掩码时，所述第二预编码矩阵组用于获取所述第一目标码本。
  17. 根据权利要求1～16任一所述的方法，其特征在于，所述通信装置支持：
    1个发射天线通道，2个接收天线通道；或者，
    1个发射天线通道，4个接收天线通道；或者，
    2个发射天线通道，4个接收天线通道；或者，
    1个发射天线通道，8个接收天线通道；或者，
    2个发射天线通道，8个接收天线通道。
  18. 一种上行天线的选择方法，其特征在于，包括：
    确定上行传输的层数和通信装置的物理天线的数量；
    根据所述上行传输的层数和所述通信装置的物理天线的数量，确定第一目标预编码矩阵；
    向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，所述第一目标编码矩阵用于指示所述通信装置用于发送上行信息的目标物理天线。
  19. 根据权利要求18所述的方法，其特征在于，所述第一目标码本包括多个第一预编码矩阵，
    所述第一预编码矩阵的行与所述通信装置的物理天线一一对应；
    其中，所述第一预编码矩阵中包括非零元素的行对应的物理天线为用于发送上行信息的物理天线。
  20. 根据权利要求19所述的方法，其特征在于，
    1≤所述第一预编码矩阵中包括非零元素的行的数量≤所述通信装置支持的同时用于上行传输的物理天线的数量。
  21. 根据权利要求18～20所述的方法，其特征在于，所述第一预编码矩阵的列数与所述层数相同。
  22. 根据权利要求21所述的方法，其特征在于，所述第一预编码矩阵的归一化系数为所述第一预编码矩阵中非零元素的平方和的平方根的倒数。
  23. 根据权利要求18～22任一所述的方法，其特征在于，所述第一预编码矩阵满足预设条件，所述预设条件为
    Figure PCTCN2018081884-appb-100011
    或者，所述预设条件为
    Figure PCTCN2018081884-appb-100012
    其中，W为所述第一预编码矩阵，W T为所述第一预编码矩阵的共轭转置矩阵，
    Figure PCTCN2018081884-appb-100013
    为对角矩阵，
    Figure PCTCN2018081884-appb-100014
    为对角矩阵。
  24. 根据权利要求19所述的方法，其特征在于，所述确定通信装置的物理天线的数量，包括：
    从所述通信装置接收天线能力上报信息，所述天线能力上报信息用于指示所述通 信装置的天线能力，所述通信装置的天线能力包括：所述通信装置的物理天线的数量。
  25. 根据权利要求18-24任一所述的方法，其特征在于，
    所述根据所述上行传输的层数和所述通信装置的物理天线的数量，确定第一目标预编码矩阵，包括：
    获取与所述上行传输的层数和所述通信装置包括的物理天线的数量对应的所述第一目标码本；
    从所述第一目标码本中确定所述第一目标预编码矩阵。
  26. 根据权利要求18-25所述的方法，其特征在于，所述第一目标码本为第一码本的子集；
    所述根据所述上行传输的层数和所述通信装置包括的物理天线的数量，确定第一目标预编码矩阵，包括：
    获取与所述上行传输的层数和所述通信装置包括的物理天线的数量对应的所述第一码本；
    根据所述通信装置的天线能力，或者，上行信道的信息，获取所述第一目标码本；
    从所述第一目标码本中确定所述第一目标预编码矩阵；
    其中，所述通信装置的天线能力包括：
    所述通信装置支持闭环天线选择；或者，
    所述通信装置包括的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线的数量；或者，
    所述通信装置支持的同时用于上行传输的物理天线。
  27. 根据权利要求26所述的方法，其特征在于，所述方法还包括：
    向通信装置发送第一指示信息；
    所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一指示信息用于指示所述第一码本中不用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一指示信息用于指示所述第一码本中用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中用于获取所述第一目标码本的预编码矩阵；或者，
    所述第一码本中不用于获取所述第一目标码本的预编码矩阵组，所述预编码矩阵组包括所述第一码本中不用于获取所述第一目标码本的预编码矩阵。
  28. 根据权利要求26所述的方法，其特征在于，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组；
    若所述第一目标码本包括所述第一预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
    在编号为偶数的时域上向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引；其中所述第一预编码矩阵组与偶数时域对应；或者，
    若所述第一目标码本包括所述第二预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
    在编号为奇数的时域上向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引，所述第二预编码矩阵组与奇数时域对应。
  29. 根据权利要求26所述的方法，其特征在于，所述第一码本包括第一预编码矩阵组和第二预编码矩阵组；
    若所述第一目标码本包括所述第一预编码矩阵组，所述向所述通信装置发送所述层数和所述第一目标预编码矩阵在第一目标码本中的索引，包括：
    向所述通信装置发送下行控制信息DCI，所述DCI包括所述层数和所述索引，所述DCI的掩码为第一CRC掩码，所述第一预编码矩阵组与所述第一CRC掩码对应；或者，
    若所述第一目标码本包括所述第二预编码矩阵组，所述向所述通信装置发送DCI，所述DCI包括所述层数和所述索引，所述DCI的掩码为第二CRC掩码，所述第二预编码矩阵组与所述第二CRC掩码对应。
  30. 一种通信装置，其特征在于，包括处理器；
    所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权1-17任一所述的方法。
  31. 根据权利要求30所述的装置，其特征在于，还包括所述存储器。
  32. 一种通信装置，其特征在于，包括处理器；
    所述处理器用于与存储器耦合，读取并执行所述存储器中的指令，以实现如权18-29任一所述的方法。
  33. 根据权利要求32所述的装置，其特征在于，还包括所述存储器。
  34. 一种计算机存储介质，包括指令，其特征在于，当所述指令在通信装置上运行时，使得所述通信装置执行如权1-17任一所述的方法。
  35. 一种计算机存储介质，包括指令，其特征在于，当所述指令在通信装置上运行时，使得所述通信装置执行如权18-29任一所述的方法。
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