WO2019095309A1 - 信道状态信息的反馈方法、通信装置和*** - Google Patents

信道状态信息的反馈方法、通信装置和*** Download PDF

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Publication number
WO2019095309A1
WO2019095309A1 PCT/CN2017/111723 CN2017111723W WO2019095309A1 WO 2019095309 A1 WO2019095309 A1 WO 2019095309A1 CN 2017111723 W CN2017111723 W CN 2017111723W WO 2019095309 A1 WO2019095309 A1 WO 2019095309A1
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WIPO (PCT)
Prior art keywords
frequency domain
indication information
elements
precoding
subbands
Prior art date
Application number
PCT/CN2017/111723
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English (en)
French (fr)
Inventor
张瑞齐
刘鹍鹏
李雪茹
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.)
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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 CN201780096646.6A priority Critical patent/CN111316692B/zh
Priority to PCT/CN2017/111723 priority patent/WO2019095309A1/zh
Priority to EP17932116.1A priority patent/EP3697128B1/en
Publication of WO2019095309A1 publication Critical patent/WO2019095309A1/zh
Priority to US15/931,749 priority patent/US10855358B2/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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • 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
    • H04B7/10—Polarisation diversity; Directional diversity

Definitions

  • the present application relates to communication technologies, and in particular, to a channel state feedback method, a communication device, and a system.
  • LTE and NR technologies use Multiple Input and Multiple Output (MIMO) technology.
  • MIMO Multiple Input and Multiple Output
  • the base station can obtain all or part of the downlink channel information, precoding can be used to improve the signal transmission quality or rate.
  • TDD Time Division Duplexing
  • the uplink and downlink of the wireless channel are mutually different, and the downlink precoding weight matrix can be estimated according to the uplink channel.
  • FDD Frequency Division Duplexing
  • a pre-coding weighting matrix is generally obtained by using a manner in which a terminal user feeds back a precoding indication.
  • the present application describes a method, a communication device and a system for transmitting channel state information.
  • the embodiment of the present application provides a method for sending channel state information, which may be performed by a chip in a terminal device or a terminal device.
  • the method includes:
  • a first frequency-domain information indicating a first number M 1 and precoding indication information wherein the information indicative of the first frequency domain frequency domain for L 1 T indicates subband frequency domain subbands, the T The frequency domain subband is a system bandwidth or a part of the system bandwidth, 1 ⁇ L 1 ⁇ T, and the T frequency domain subbands are in one-to-one correspondence with T precoding matrices, corresponding to the kth frequency domain.
  • the precoding matrix W k of the band satisfies:
  • W 1 is a matrix of N t rows and R columns, a matrix of R rows and S columns;
  • the first frequency domain indication information and the M 1 first precoding indication information are used to determine T first elements, and the kth first element of the T first elements is The factor of the sth column element in the rth row, 1 ⁇ M 1 ⁇ T;
  • M 1 second precoding indication information is generated
  • the elements of the rth row and the r+Ith row respectively act on antennas of different polarizations at the same position of the antenna array. and The laws of the factors in the frequency domain of the elements of the rth row s column and the r+I row q column may be relatively close. So, for The factors of the elements of the rth row s column and the r+I row q column are all indicated by the first frequency domain indication information to reduce the feedback overhead.
  • the second frequency domain indication information and the M 2 third precoding indication information are generated, where the second frequency domain indication information is used to indicate L 2 frequencies in the T frequency domain subbands.
  • the second frequency domain indication information and the M 2 third precoding indication information are used to determine T third elements, and the kth third element of the T third elements is The factor of the element in the vth column of the uth row, 1 ⁇ M 2 ⁇ T, where u is not equal to r or v is not equal to s;
  • M 1 fourth precoding indication information is generated, where S ⁇ 2, the first frequency domain indication information and the M 1 fourth precoding indication information are used to determine T fourth elements
  • the kth fourth element of the T fourth elements is The factor of the element in the tth column of the rth row, t is not equal to s;
  • the T of the first element comprises a first element M 1,
  • the generating the first frequency domain indication information includes:
  • the present application further provides a method for receiving channel state information, which may be performed by a chip in an access network device or an access network device. This includes:
  • Receiving information indicating a first frequency domain and M 1 precoding indication information wherein the information indicative of the first frequency domain frequency domain for L 1 T indicates subband frequency domain subbands in the frequency-T
  • the domain subband is a system bandwidth or a part of the system bandwidth, 1 ⁇ L 1 ⁇ T
  • the T frequency domain subbands are in one-to-one correspondence with T precoding matrices, corresponding to the kth frequency domain subband
  • the precoding matrix W k satisfies:
  • W 1 is a matrix of N t rows and R columns, a matrix of R rows and S columns;
  • T first elements Determining T first elements according to the first frequency domain indication information and the M 1 first precoding indication information, where a kth first element of the T first elements is The factor of the element in the ith column of the rth row, 1 ⁇ M 1 ⁇ T.
  • M 1 second precoding indication information is received
  • the second frequency domain indication information and the M 2 third precoding indication information are received, where the second frequency domain indication information is used to indicate L 2 frequencies in the T frequency domain subbands.
  • Domain subband 1 ⁇ L 2 ⁇ T;
  • T third elements Determining T third elements according to the second frequency domain indication information and the M 2 third precoding indication information, wherein a kth third element of the T third elements is The factor of the element in the vth column of the uth row, 1 ⁇ M 2 ⁇ T, where u is not equal to r or v is not equal to s.
  • M 1 fourth precoding indication information is received
  • T fourth elements Determining T fourth elements according to the first frequency domain indication information and the M 1 fourth precoding indication information, where S ⁇ 2, the kth fourth element of the T fourth elements is The factor of the element in the tth column of the rth row, t is not equal to s.
  • the determining the T first elements according to the first frequency domain indication information and the M 1 first precoding indication information includes:
  • the information indicative of the first frequency domain and the first elements M 1, using the interpolating method first determines the T TM 1 elements other than said first elements of a first element M 1.
  • the embodiment of the present application provides a communication device, which may be a communication device or a chip.
  • the communication device can implement the method of the first aspect described above and have corresponding functional units.
  • the functional unit may be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the communication device includes:
  • the T frequency domain subband is a system bandwidth or a part of the system bandwidth, 1 ⁇ L 1 ⁇ T, and the T frequency domain subbands are in one-to-one correspondence with T precoding matrices, corresponding to the first
  • the precoding matrix W k of the k frequency domain subbands satisfies:
  • W 1 is a matrix of N t rows and R columns, a matrix of R rows and S columns;
  • the first frequency domain indication information and the M 1 first precoding indication information are used to determine T first elements, and the kth first element of the T first elements is The factor of the sth column element in the rth row, 1 ⁇ M 1 ⁇ T;
  • a transceiver unit for transmitting the first frequency domain of the M 1 and indication information of first precoding indication information.
  • the transceiver unit is further configured to send the second M 1 precoding indication information.
  • the processing unit is further configured to generate second frequency domain indication information and M 2 third precoding indication information, where the second frequency domain indication information is used to indicate the T frequency domains.
  • L 2 frequency domain subbands in the subband 1 ⁇ L 2 ⁇ T;
  • the second frequency domain indication information and the M 2 third precoding indication information are used to determine T third elements, and the kth third element of the T third elements is The factor of the element in the vth column of the uth row, 1 ⁇ M 2 ⁇ T, where u is not equal to r or v is not equal to s;
  • the transceiver unit is further configured to send the second frequency domain indication information and the M 2 third precoding indication information.
  • the processing unit is further configured to generate M 1 th fourth pre-coding indication information, wherein, S ⁇ 2, the first indication information and the frequency domain M 1 th fourth pre-coding indication information
  • the kth fourth element of the T fourth elements is The factor of the element in the tth column of the rth row, t is not equal to s;
  • the transceiver unit is further configured to send the M 1 th fourth pre-coding indication information.
  • the processing unit is further configured to determine M 1 frequency domain subbands in the T frequency domain subbands, where the M 1 frequency domain subbands comprise the L 1 frequency domain subbands. L 1 ⁇ M 1 ;
  • the processing unit is further configured to determine a first M 1 a M 1 elements of the frequency-domain subbands one to one, the T first element comprises first elements of the M 1;
  • the processing unit is configured to generate the first frequency domain indication information according to the L 1 frequency domain subbands
  • the processing unit is further configured to M 1 according to the frequency-domain sub-band and the first elements M 1, is determined using the T interpolating method in the first element of M 1 of the first elements in addition to Outer TM 1 first element.
  • the embodiment of the present application provides a communication device, which may be a communication device or a chip.
  • the communication device can be an access network device.
  • the communication device can implement the method of the second aspect described above and has corresponding functional units.
  • the functional unit may be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the communication device includes:
  • a transceiver unit for receiving a first frequency domain indication information M 1 and precoding indication information, wherein the information indicative of the first frequency domain frequency domain for L 1 T indicates subband frequency domain subbands,
  • the T frequency domain subbands are part of the system bandwidth or the system bandwidth, L 1 ⁇ T, and the T frequency domain subbands are in one-to-one correspondence with T precoding matrices, corresponding to the kth frequency domain.
  • the sub-band precoding matrix W k satisfies:
  • W 1 is a matrix of N t rows and R columns, a matrix of R rows and S columns;
  • the transceiver unit is further configured to receive M 1 second precoding indication information
  • the processing unit is further configured to determine T second elements according to the first frequency domain indication information and the M 1 second precoding indication information, where the kth element of the T second elements Two elements
  • the transceiver unit is further configured to receive second frequency domain indication information and M 2 third precoding indication information, where the third frequency domain indication information is used to indicate the T frequency domains.
  • L 2 frequency domain subbands in the subband 1 ⁇ L 2 ⁇ T;
  • the processing unit is further configured to determine T third elements, the kth third of the T third elements, according to the second frequency domain indication information and the M 2 third precoding indication information Element is The factor of the element in the vth column of the uth row, 1 ⁇ M 2 ⁇ T, where u is not equal to r or v is not equal to s.
  • the transceiver unit is further configured to receive a fourth M 1 th precoding indication information
  • the processing unit is further configured to determine T fourth elements according to the first frequency domain indication information and the M 1 fourth precoding indication information, where S ⁇ 2, the T fourth elements
  • the kth fourth element is The factor of the element in the tth column of the rth row, t is not equal to s.
  • the processing unit is configured to determine, according to the first frequency domain indication information, M 1 frequency domain subbands in the T frequency domain subbands, where the M 1 frequency domain subbands include The L 1 frequency domain sub-bands, L 1 ⁇ M 1 ;
  • the processing unit is configured to determine, according to the M 1 first precoding indication information, M 1 first elements in the T first elements, where the M 1 frequency domain subbands and the M 1 One-to-one correspondence of the first elements;
  • the processing unit according to the first indication information in the frequency domain and the first elements M 1, is determined using the T interpolating method in addition to the first element of the first elements of the M 1 TM 1 first element.
  • the embodiment of the present application provides a method for sending channel quality information, where the method includes:
  • the application further provides a method for receiving channel quality information, where the method includes:
  • T CQIs of the T frequency domain subbands according to the fourth frequency domain indication information and the M 3 CQIs. And the T CQIs are in one-to-one correspondence with the T frequency domain subbands.
  • the embodiment of the present application provides a communication device, which may be a communication device or a chip.
  • the communication device can be a terminal device.
  • the communication device can implement the method of the above fifth aspect and has corresponding functional units.
  • the functional unit may be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the communication device includes:
  • the processing unit generates fourth frequency domain indication information and M 3 CQIs, where the T CQIs are in one-to-one correspondence with T frequency domain subbands, and the fourth frequency domain indication information is used to indicate T frequency domains.
  • L 3 frequency domain subbands in the subband, L 3 ⁇ T, the fourth frequency domain indication information and the M 3 CQIs are used to determine the T CQIs, 1 ⁇ M 3 ⁇ T;
  • transceiver unit configured to send the fourth frequency domain indication information and the M 3 CQIs.
  • an embodiment of the present application provides a communication device, which may be a communication device or a chip.
  • the communication device can be an access network device.
  • the communication device can implement the method of the above sixth aspect and has corresponding functional units.
  • the functional unit may be implemented by hardware, software, or by executing corresponding software by hardware.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the communication device includes:
  • a transceiver unit configured to receive fourth frequency domain indication information and M 3 CQIs;
  • a processing unit configured to determine, according to the fourth frequency domain indication information, L 3 frequency domain subbands in T frequency domain subbands, L 3 ⁇ T;
  • the processing unit is further configured to obtain T CQIs of the T frequency domain subbands according to the fourth frequency domain indication information and the M 3 CQIs. And the T CQIs are in one-to-one correspondence with the T frequency domain subbands.
  • the embodiment of the present application provides a computer storage medium, configured to store computer software instructions for use in the foregoing communication device, including the first aspect or the second aspect or the fifth aspect or the sixth aspect. The procedures involved.
  • an embodiment of the present application provides a computer program product, comprising instructions, when the computer program is executed by a computer, causing the computer to perform the first aspect or the second aspect or the fifth aspect or the sixth The method described in the aspects.
  • an embodiment of the present application provides a system, where the system includes the foregoing communication device.
  • the embodiment of the present application provides a chip system, where the chip system includes a processor for supporting the foregoing communication device to implement the functions involved in the foregoing aspects, for example, generating or processing the method involved in the foregoing method. Data and / or information.
  • the chip system may further comprise a memory for storing program instructions and data necessary for the data transmitting device.
  • the chip system can be composed of a chip, and can also include a chip and other separate devices.
  • the method, the communication device and the system for transmitting channel state information provided by the present application reduce the number of bits of the terminal device feedback channel state information. In turn, the system overhead is reduced and the resource utilization of the system is improved.
  • FIG. 1 is a schematic diagram of a wireless communication system provided by the present application.
  • FIG. 2 is a schematic diagram of a possible structure of an access network device in the above wireless communication system.
  • FIG. 3 is a schematic diagram of a possible structure of a terminal device in the above wireless communication system.
  • FIG. 4 is a schematic block diagram of a communication device in accordance with an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a channel state information feedback method provided by the present application.
  • FIG. 6a is a schematic diagram of determining, by a terminal device, precoding indication information according to the present application.
  • FIG. 6b is a schematic diagram of obtaining, by the access network device, T first elements according to the present application.
  • FIG. 7 is a schematic diagram of channel state information provided in the present application in a frequency domain.
  • FIG. 8 is a schematic diagram of a terminal device feeding back CQI provided by the present application.
  • the feedback method of the channel state information of the present application may be performed by the communication device.
  • the communication device On the network side, the communication device may be a chip in the access network device or the access network device, that is, the feedback method of the channel state information of the present application may be performed by the chip in the access network device or the access network device;
  • the communication device On the device side, the communication device may be a chip in the terminal device or the terminal device, that is, a feedback method of the channel state information of the present application may be performed by a chip in the terminal device or the terminal device.
  • the present application uses a communication device as an access network device or a terminal device as an example to describe a wireless communication method.
  • a communication device that is a chip in an access network device or a chip in a terminal device.
  • the specific description of the feedback method of the channel state information of the reference access network device or the terminal device will not be repeatedly described.
  • FIG. 1 is a schematic diagram of a possible network architecture of the present application.
  • At least one terminal device 10 is included, which communicates with the access network device 20 via a wireless interface.
  • the channel through which the access network device transmits data to the terminal device is a downlink channel.
  • the channel through which the terminal device transmits data to the access network device is an uplink channel.
  • the terminal device is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld or on-board; it can also be deployed on the water surface (such as a ship, etc.); it can also be deployed in the air (for example, an aircraft, Balloons and satellites, etc.).
  • the terminal may be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, industrial control (industrial control) Wireless terminal, wireless terminal in self driving, wireless terminal in remote medical, wireless terminal in smart grid, wireless terminal in transportation safety, A wireless terminal in a smart city, a wireless terminal in a smart home, and the like.
  • An access network device is a device that connects a terminal device to a wireless network, including but not limited to: a gNB in 5G, an evolved node B (eNB), and a radio network controller (radio network controller, RNC), Node B (NB), base station controller (BSC), base Base transceiver station (BTS), home base station (for example, home evolved node B, or home node B, HNB), baseband unit (BBU), base station (g nodeB, gNB), transmission point (transmitting and The receiving point (TRP), the transmitting point (TP), the mobile switching center, and the like, and may also include a Wifi access point (AP) and the like.
  • RNC radio network controller
  • Node B Node B
  • BSC base station controller
  • BTS base Base transceiver station
  • home base station for example, home evolved node B, or home node B, HNB
  • BBU baseband unit
  • TRP transmission point
  • TRP transmitting and The receiving point
  • the access network device 20 may include a controller or a processor 201 (hereinafter, the processor 201 is taken as an example) and a transceiver 202. Controller/processor 201 is sometimes also referred to as a modem processor. Modem processor 201 can include a baseband processor (BBP) (not shown) that processes the digitized received signal to extract information or data bits conveyed in the signal.
  • BBP baseband processor
  • DSPs digital signal processors
  • the BBP can also be implemented by a separate integrated circuit (IC).
  • the transceiver 202 can be used to support the transmission and reception of information between the access network device 20 and the terminal device, and to support radio communication with the terminal device.
  • an uplink signal from a terminal device is received via an antenna.
  • the signals received from the antenna are adjusted (e.g., filtered, amplified, downconverted, digitized, etc.) by transceiver 202 and provide input samples. And further processed by the processor 201 to recover the service data and/or signaling information transmitted by the terminal device.
  • traffic data and/or signaling messages are processed by the terminal device and modulated by the transceiver 202 to generate downlink signals for transmission to the terminal device via the antenna.
  • the access network device 20 can also include a memory 203 that can be used to store program code and/or data for the access network device 20.
  • the transceiver 202 can include separate receiver and transmitter circuits, or the same circuit can implement transceiving functions.
  • the access network device 20 can also include a communication unit 204 for supporting the access network device 20 to communicate with other network entities. For example, it is used to support the access network device 102 to communicate with a network device or the like of the core network.
  • FIG. 3 is a schematic diagram of a possible structure of a terminal device in the above wireless communication system.
  • the terminal device is capable of performing the method provided by the embodiment of the present invention.
  • the terminal device may be the terminal device 10 in FIG.
  • the terminal device includes a transceiver 301, a processor 300, and a memory 303.
  • Processor 300 can include an application processor 302 and a modem processor 304.
  • Transceiver 301 can condition (e.g., analog convert, filter, amplify, upconvert, etc.) output samples and generate an uplink signal.
  • the uplink signal is transmitted to the access network device via the antenna.
  • the antenna receives the downlink signal transmitted by the access network device.
  • Transceiver 301 can condition (eg, filter, amplify, downconvert, digitize, etc.) the signals received from the antenna and provide input samples.
  • Modem processor 304 also sometimes referred to as a controller or processor, may include a baseband processor (BBP) (not shown) that processes the digitized received signal to extract information conveyed in the signal Or data bits.
  • BBP baseband processor
  • a modem processor 304 may include an encoder 3041, a modulator 3042, a decoder 3043, and a demodulator 3044.
  • the encoder 3041 is for encoding the signal to be transmitted.
  • encoder 3041 can be used to receive traffic data and/or signaling messages to be transmitted on the uplink and to process (eg, format, encode, or interleave, etc.) the traffic data and signaling messages.
  • Modulator 3042 is used to modulate the output signal of encoder 3041.
  • the modulator can output the signal to the encoder (data and / Or signaling) performing processing such as symbol mapping and/or modulation, and providing output samples.
  • a demodulator 3044 is used to demodulate the input signal.
  • demodulator 3044 processes the input samples and provides symbol estimates.
  • the decoder 3043 is configured to decode the demodulated input signal.
  • the decoder 3043 deinterleaves, and/or decodes the demodulated input signal and outputs the decoded signal (data and/or signaling).
  • Encoder 3041, modulator 3042, demodulator 3044, and decoder 3043 may be implemented by a composite modem processor 304.
  • Modem processor 304 receives digitized data representative of voice, data or control information from application processor 302 and processes the digitized data for transmission.
  • the associated modem processor can support one or more of a variety of wireless communication protocols of various communication systems, such as LTE, New Radio (NR), Universal Mobile Telecommunications System (UMTS), high speed. High Speed Packet Access (HSPA) and so on.
  • LTE Long Term Evolution
  • NR New Radio
  • UMTS Universal Mobile Telecommunications System
  • HSPA High Speed Packet Access
  • one or more memories may also be included in the modem processor 304.
  • modem processor 304 and the application processor 302 may be integrated in one processor chip.
  • the memory 303 is used to store program code (sometimes referred to as programs, instructions, software, etc.) and/or data for supporting communication of the terminal device.
  • program code sometimes referred to as programs, instructions, software, etc.
  • the memory 203 or the memory 303 may include one or more storage units, for example, may be a processor 201 for storing program code or a storage unit inside the modem processor 304 or the application processor 302, or may Is an external storage unit separate from the processor 201 or the modem processor 304 or the application processor 302, or may also be a storage unit including the processor 201 or the modem processor 304 or the application processor 302 and with the processor 201 or modem
  • the processor 304 or the application processor 302 is a separate component of an external storage unit.
  • Processor 201 and modem processor 304 may be the same type of processor or different types of processors. For example, it can be implemented in a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), and a field programmable gate array ( Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, other integrated circuit, or any combination thereof.
  • the processor 201 and the modem processor 301 can implement or perform various exemplary logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor may also be a combination of computing function devices, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, or a system-on-a-chip (SOC) or the like.
  • a communication device 400 is shown.
  • the communication device can be applied to the communication system shown in FIG. 1.
  • the communication device 400 can implement the communication method of the terminal device in the embodiment of the present application, and can also implement the communication method of the access network device in the embodiment of the present application.
  • the apparatus 200 includes at least one processing unit 402, a transceiver unit 401, and optionally a storage unit 403.
  • the processing unit 402, the transceiver unit 401, and the storage unit 403 are connected to each other by a circuit.
  • the storage unit 403 is configured to store application code that executes the solution of the present application, and is controlled by the processing unit 402.
  • the processing unit 402 is configured to execute an application code stored in the storage unit 403.
  • the transceiver unit 401 can be the transceiver 202
  • the storage unit 403 can be the memory 203
  • the processing unit 402 can be the controller/processor 201; when the communication device is the terminal device
  • the transceiver unit 401 can be the transceiver 201
  • the storage unit 403 can be the memory 303
  • the processing unit 402 can be the processor 300.
  • the processing unit 402 may be a processor, and the transceiver unit 401 may be an input/output interface, a pin or a circuit. Wait.
  • the processing unit 402 can execute computer execution instructions stored by the storage unit 403 to cause the chip to execute the wireless communication method in the embodiment of the present application.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the base station or terminal, such as a ROM or may be stored. Static information and instructions for other types of static storage devices, RAM, etc.
  • interpolation includes, but is not limited to, the following interpolation methods:
  • the elements c, c of the a row b column of the matrix A can be variables or constants.
  • the factor of element c of row a and column b of matrix A is defined as follows:
  • the factor of element c of row a and column b of A may be c itself; the factor of element c of row a and column b of A may also be a product factor of c.
  • a product factor for c is defined as follows:
  • any one of c 1 to c n is a product factor of c.
  • the factor of element c of row a and column b of A may also be the real or imaginary part of a product factor of c.
  • the factor of element c of row a and column b of A may also be the real or imaginary part of c.
  • the factor of element c of row a and column b of A may also be the magnitude or phase in a product factor of c.
  • c 1 D ⁇ e j ⁇ .
  • D is a real number, which is the magnitude of the multiplication factor c 1 .
  • e j ⁇ is the phase of the multiplication factor c 1 .
  • system bandwidth is the bandwidth allocated to the access network device and used to transmit and receive data with the terminal device within the access network device.
  • System bandwidth can include downstream system bandwidth, and upstream system bandwidth.
  • the system bandwidth can be divided into multiple frequency domain subbands.
  • the system bandwidth is 10 MHz, divided into 10 frequency domain subbands, and the frequency domain bandwidth of each frequency domain subband is 1 MHz.
  • the frequency domain sub-band is simply referred to as a sub-band.
  • the channel state information may include one or more of a rank indication, precoding indication information, and a channel quality indicator (CQI).
  • the precoding indication information is information indicating a precoding matrix, or an element indicating a precoding matrix, or a factor of a precoding matrix element.
  • the precoding indication information may be a PMI.
  • a high precision codebook structure is defined as follows.
  • the precoding matrix W is satisfied by the formula (1)
  • W 1 is a block diagonal matrix
  • W 1 is a matrix of 2 t rows of N t rows, A matrix of 2 columns S columns.
  • different vectors b d are orthogonal to each other.
  • b d is a two-dimensional Discrete Fourier Transform (DFT) vector. That is, b d can be expressed as the Kronecker Product of two one-dimensional DFT vectors.
  • DFT Discrete Fourier Transform
  • the product factor of the elements of the rth row and the sth column of the matrix W 2 Indicates the amplitude of the broadband and subbands, z r,s represents phase information.
  • z r, s can range from The range of z r,s can also be
  • r represents the row of the W 2 matrix and s represents the column of the W 2 matrix.
  • the antenna array is dual-polarized antenna array, the elements of the first row 2 W effect to the first row I the data on a polarization direction of the antenna weighting; W first row I + 1 to the second 2 row 2I The elements in the weighting the data on the antenna in the other polarization direction.
  • W 2 r-th row and row r + I element are respectively applied to data transmitted with the antenna array on a different polarized antenna weighted position, this time 1 ⁇ r ⁇ I.
  • the terminal device needs to feed back the multiplication factor in each element of W 2 The value of z r,s .
  • FIG. 5 is a schematic diagram of a method for wireless communication provided by the present application.
  • a wireless communication method provided by the application is described by taking a transmitting device as a terminal device and a receiving device as an access network device as an example.
  • Step 501 The terminal device generates the first frequency domain M 1 and indication information of first precoding indication information.
  • the terminal device In step 501, the terminal device generates a first frequency domain and M 1 indication information of first precoding indication information.
  • the first frequency domain indication information is used to indicate L 1 frequency domain subbands in the T frequency domain subbands, where the T frequency domain subbands are part of the system bandwidth or the system bandwidth, 1 ⁇ L 1 ⁇ T, the T frequency domain subbands are in one-to-one correspondence with T precoding matrices, and the precoding matrix W k corresponding to the kth frequency domain subband satisfies:
  • W 1 is a matrix of N t rows and R columns, A matrix of R rows and S columns.
  • N t is the number of transmit antenna ports
  • S is the number of layers of data transmission, which is also the number of ranks.
  • the T frequency domain subbands are system bandwidths, meaning that the system bandwidth is composed of the T frequency domain subbands.
  • the T frequency domain subbands can also be part of the system bandwidth.
  • the system bandwidth is 10MHz and is divided into 10 frequency domain subbands.
  • T 10
  • T frequency domain subbands can form the system bandwidth.
  • T ⁇ 10
  • T frequency domain subbands are part of the system bandwidth.
  • the one-to-one correspondence between the T frequency domain subbands and the T precoding matrices means that a precoding matrix is required on one frequency domain subband.
  • the precoding matrix is that the terminal device recommends to the access network device through the precoding indication information.
  • the terminal device When the access network device transmits data to the terminal device on a frequency domain subband, the terminal device expects the access network device to precode the data using a precoding matrix corresponding to the frequency domain subband.
  • the first frequency domain indication information and the M 1 first precoding indication information are used to determine T first elements, and the kth first element of the T first elements is The factor of the sth column element in the rth row, 1 ⁇ M 1 ⁇ T.
  • Indicates broadband amplitude information The subbands are the same in all frequency domains and do not vary with the frequency domain subband k. Indicates subband amplitude information, different k, Can be different. Indicates phase, different k, Can be different. That is, The value varies with subband k.
  • the factor of the sth column element in the rth row is There are 13 first elements, respectively
  • the kth first element of the T first elements is 0 ⁇ k ⁇ 12.
  • the 0th first element of the T first elements is The first first element is
  • N t is an even number
  • X 1 is a matrix of row I columns
  • X 1 [b 1 b 2 ... b I ], where vector b d is included
  • the column vector of the elements, 1 ⁇ d ⁇ I, I is a positive integer greater than or equal to 1.
  • N t is an even number.
  • R 2I
  • W k is a matrix of 2I rows and S columns.
  • the structure of the precoding matrix in the equations (1) - (4) can be satisfied.
  • W k , W 1 and It corresponds to W, W 1 and W 2 in the formulas (1) to (4), respectively.
  • W 2 is General structure.
  • This step can be implemented by the processor 300.
  • the communication device in FIG. 4 is a terminal device or a chip of the terminal device, this step may also be implemented by the processing unit 402.
  • Step 502 the terminal apparatus transmitting the first information and the frequency domain M 1 indicates a first pre-coding indication information.
  • Figure 6a shows a schematic diagram of the terminal device determining precoding indication information.
  • Step 601a The terminal device determines M 1 frequency domain subbands in the T frequency domain subbands, and the M 1 frequency domain subbands include L 1 frequency domain subbands.
  • step 601a M 1 frequency domain sub-bands in the T frequency domain sub-bands are determined, and the M 1 frequency domain sub-bands include the L 1 frequency domain sub-bands, L 1 ⁇ M 1 . Furthermore, the terminal apparatus determines a first M 1 a M 1 elements of the frequency-domain subbands one to one, the T M 1 of the first element comprises first elements. Since M 1 first element is The factor of the element, so this M 1 first element corresponds to the M 1 frequency domain sub-band respectively.
  • M 1 L 1 .
  • Step 602a generating a terminal device with information indicative of the first frequency domain according to L 1 sub-frequency domain.
  • the terminal device generates first frequency domain indication information according to the number (or index) of subband 0, subband 3, subband 8 and subband 12.
  • Step 603a The terminal device determines, by using an interpolation method, the remaining TM 1 elements according to the M 1 frequency domain subband and the M 1 first element.
  • step 603a the M 1 based on the frequency domain sub-band and the first elements M 1 is determined using the T interpolating method of TM in addition to the first element of the first elements of the M 1 1 element.
  • FIG. 6b shows a schematic diagram of an access network device obtaining T first elements according to precoding indication information.
  • Step 601b The access network device determines, according to the first frequency domain indication information, the M 1 frequency domain subband in the T frequency domain subbands.
  • step 601b determining, according to the first frequency domain indication information, an M 1 frequency domain subband in the T frequency domain subbands, where the M 1 frequency domain subband includes the L 1 frequency domain subbands , L 1 ⁇ M 1 .
  • Step 602b access network device according to indication information of first precoding M 1 M 1 is determined first elements of the first elements of T.
  • step 602b the access network device M 1 based on the information of first precoding indication of the determined first element of the T M 1 in the first elements, the first elements M 1 and the The M 1 frequency domain sub-bands are in one-to-one correspondence.
  • Step 603b access network device and the information indicating the first elements M 1 using the interpolation method to determine the remaining elements TM 1 according to the first frequency domain.
  • step 602b the access network device according to the indication information and the first elements M 1 according to the first frequency domain, using the interpolated first embodiment determines the T M 1 elements of the first elements in addition outside the TM 1 first element.
  • the system bandwidth includes 13 sub-bands, each of which is numbered 0-12.
  • k be the subband number, 0 ⁇ k ⁇ 12.
  • the sub-band 3 and the sub-band 8 are in-phase inflection point positions.
  • the inflection point refers to the subband between the two inflection points Meet monotonically increasing or monotonous decreasing features.
  • the phase factor on the subband between subband 3 and subband 8 Meet monotonically increasing or monotonous decreasing features.
  • Subband 3 and subband 8 can also be considered as phase factors The local minimum point or the local maximum point. As long as the phase factor on the subband between subband 3 and subband 8 Satisfy with a distribution function, such as a linear distribution, then you can use subband 3 and subband 8 Representing as a parameter on any subband between subband 3 and subband 8.
  • L 1 frequency domains in the T frequency domain sub-bands include The sub-band where the inflection point is located; may also include the first sub-band in the system bandwidth (for example, the sub-band numbered 0 in Figure 7); may also include the last sub-band in the system bandwidth (for example, Figure 7 neutron) Sub-band with number 12).
  • L 1 4 and L 1 sub-bands are sub-bands with sub-band numbers 0, 3, 8, and 12, respectively.
  • M 1 L 1
  • the M 1 first precoding indication information indicates M 1 first elements.
  • the M 1 elements are respectively on the L 1 frequency domain subbands The elements of the rth row s column.
  • the M 1 first elements indicated by the M 1 first precoding indication information may be in a precoding matrix corresponding to the frequency domain subband numbers 0, 3, 8, and 12. Phase factor of the element in row 2, column 1
  • the terminal Since M 1 ⁇ T, the terminal does not feed back the precoding indication information of all T frequency domain subbands, and the terminal device saves feedback overhead.
  • the M 1 first precoding indication information carries information indicating that the M 1 elements are displayed.
  • the M 1 element is The range of values is One of the M 1 first precoding indication information requires 2 bit indications, in which case the M 1 first precoding indication information requires 2 M 1 bits.
  • the display indication includes all bit indication modes, and a differential indication mode. When the number of states of an element indicated by an indication information is Q, in order to represent these Q states. need Bit representation. If used The bits represent these Q states. That is the way all bits are indicated. Indicates rounding up on x.
  • the differential indication mode has a reference point, and the indication information value indicates a differential value of a reference point, for example, the differential value is indicated by one bit.
  • M 1 first precoding indication information indicates M 1 in the manner indicated by all bits Value.
  • M 1 of first precoding indication information in accordance with one embodiment all the bits indicate a sub-band frequency domain
  • the adjacent subbands herein are adjacent frequency domain subbands in the frequency domain subband indicated by the first frequency domain indication information.
  • the first frequency domain indication information indicates frequency domain subbands with frequency domain subband numbers 0, 3, 8, and 12.
  • the frequency domain subbands numbered 0 and 3 are adjacent, the subbands numbered 3 and 8 are adjacent, and so on.
  • M 1 4.
  • the first indication of the M 1 precoding indication information is determined, and the second precoding indication information indicates the differential value ⁇ 1 of the subband number 3 and the subband number 0.
  • the third precoding indication information indicates the difference value ⁇ 2 of the subband number 8 and the subband number 3.
  • the fourth precoding indication information indicates the difference value ⁇ 3 of the subband number 12 and the subband number 8.
  • the first frequency domain indication information indicates frequency domain subbands with frequency domain subband numbers 0, 3, 8, and 12.
  • the frequency domain subband number is x, y z x r, s , z y r, s is indicated by the first precoding indication information, and the frequency domain subband number is z l r between x and y , s is obtained by interpolation, where x ⁇ l ⁇ y.
  • the phase factor of the frequency domain subband numbers 1 and 2 is obtained by interpolating the phase factors of the frequency domain subband numbers 0 and 3.
  • the phase factor of the frequency domain subband number 4-7 is obtained according to the phase factor interpolation of the frequency domain subband numbers 3 and 8. And so on.
  • the interpolation method (or interpolation function) can be specified by the protocol.
  • the type of the interpolation mode may also be notified to the terminal device by the access network device through signaling.
  • f( ⁇ ) indicates the interpolation method.
  • M 1 >L 1 .
  • the indication information does not include the number of the first frequency domain subband and the last frequency domain subband.
  • the factors of the elements all indicate the frequency domain location with the first frequency domain indication information.
  • the elements of the W 2 corresponding to the antennas of different polarizations at the same position may be the same or relatively close in the inversion point in the frequency domain. Therefore, the terminal device also generates M 1 second precoding indication information.
  • the first frequency domain indication information indicates frequency domain subbands with frequency domain subband numbers 0, 3, 8, and 12.
  • the access network device receives information indicative of the first frequency domain and the second M 1 precoding indication information, indicating information according to the first indication information in the frequency domain and the second precoding M 1, can be determined
  • Precoding matrix of T subbands The phase factor of the qth column of the r+Ith row. So, for The elements of the rth row and the r+Ith row all use the first frequency domain indication information to indicate the frequency domain location, which can reduce the feedback overhead.
  • the terminal device generates the M 1 th first pre-coding indication information is omitted.
  • the terminal device determines the T second elements see the method by which the terminal device determines the T first elements. No longer.
  • the access network determines how the device T according to the second element of the first frequency domain indication information M 1 and second precoding indication information, see the above-described access network device according to the first indication information in the frequency domain and one M 1
  • the first precoding indication information determines the method of the T first elements, and details are not described herein again.
  • the terminal device generates second frequency domain indication information and M 2 third precoding indication information, where the second frequency domain indication information is used to indicate L 2 in the T frequency domain subbands. Frequency domain subbands, L 2 ⁇ T.
  • the second frequency domain indication information and the M 2 third precoding indication information are used to determine T third elements, where the T third third k elements are The factor of the element in the vth column of the uth row, 1 ⁇ M 2 ⁇ T, where u is not equal to r, or v is not equal to s, 1 ⁇ u ⁇ R, 1 ⁇ v ⁇ S.
  • the terminal device sends the second frequency domain indication information and the M 2 third precoding indication information.
  • there are at least two The frequency domain indication information of the elements in different positions is different, and is respectively the first frequency domain indication information and the second frequency domain indication information, thereby improving the feedback precision of the PMI.
  • the precoding indication information (the first precoding indication information, the precoding such as the first precoding indication information, etc.) may not indicate the maximum amplitude of each column.
  • right z r, s is the same. That is to say, the element indicated by the precoding indication information may not be indicated because the elements on the reference point are usually constant.
  • Elements in different locations can have their own frequency domain indications. For example, each phase information z r,s has a corresponding frequency domain indication information to indicate the inflection point position of z r,s .
  • the access network determines how the device according to the third element of T frequency-domain information based on the second indication information M 2 and two third precoding indication, see above access network device according to the first indication information in the frequency domain and M 1
  • the first precoding indication information determines the method of the T first elements, and is not described again.
  • R ⁇ 2 that is, There are at least two columns in it. In this example, At least two identical rows, but the factor frequency domain indication information for the elements of the different columns is the same.
  • M 1 terminal device generates a fourth pre-coding indication information, the first indication information and the frequency domain M 1 indicates a fourth pre-coding information for determining T a fourth element, the fourth element of the T
  • the kth element is The factor of the element in the tth column of the rth row, t is not equal to s, 1 ⁇ r ⁇ R, 1 ⁇ t ⁇ S. Transmitting the fourth terminal device M 1 th precoding indication information.
  • the elements of different columns of the peer have the same frequency domain indication of the first frequency domain indication information to reduce the feedback overhead.
  • the terminal device generates the M 1 th first pre-coding indication information is omitted.
  • T fourth elements refer to the method in which the terminal device determines T first elements. No longer.
  • how to determine the access network device according to a fourth element of the T first indication information in the frequency domain and M 1 th fourth pre-coding indication information see the above-described access network device according to the first indication information in the frequency domain and one M 1
  • the first precoding indication information determines the method of the T first elements, and details are not described herein again.
  • R 2I
  • p r + I
  • u is not equal to r
  • u is not equal to r + I
  • q s, 1 ⁇ v ⁇ S.
  • the factors of the rth row s column and the r+I row s column element may share the first frequency domain indication information.
  • the factor of the uth row v column element additionally uses the second frequency domain indication information. In doing so, the terminal device can save feedback overhead and improve feedback accuracy.
  • R 2I
  • p r + I
  • u is not equal to r
  • u is not equal to r + I
  • 1 ⁇ q ⁇ S 1 ⁇ v ⁇ S.
  • the factors of the elements of all columns of the rth row and all columns of the r+Ith row may share the first frequency domain indication information.
  • the factor of the uth row v column element additionally uses the second frequency domain indication information. In doing so, the terminal device can save feedback overhead and improve feedback accuracy.
  • the position index of the mth subband in the frequency domain subband position is subtracted by 1, n (m) ⁇ ⁇ 0, 1, ..., T-2 ⁇ ; the first precoding indication when subband 0 and subband T-1
  • N T-2.
  • n (m) represents the position index of the mth subband in the selected M frequency domain subband positions minus 1, n (m) ⁇ ⁇ 0, 1, ..., T-3 ⁇ ;
  • N T,
  • n (m) represents the position index of the mth subband in the selected M frequency domain subband positions, n (m) ⁇ ⁇ 0, 1, ..., T-1 ⁇ .
  • Element of the rth row s column Phase factor As an example, it is described. Element of the rth row s column Factor can also be Element of the rth row s column Factor can also be with The two-two product. Element of the rth row s column Factor can also be and many more. The other factors are implemented and the above factors are The embodiments are similar and will not be described again. .
  • the terminal device obtains a channel quality indicator (CQI) of the T frequency domain subbands. And the CQIs of the T subbands are obtained on condition of the T precoding matrices on the T frequency domain subbands. That is, the terminal device assumes that the base station precodes the downlink data by using the precoding matrix corresponding to the subband on each subband of the T subbands, and the terminal device derives the CQI according to the assumption.
  • the terminal device sends the CQI of the T frequency domain subbands to the access network device.
  • the terminal device can also report a part of the CQI of the T frequency domain subbands.
  • the terminal device generates fourth frequency domain indication information and M 3 CQIs, where the T CQIs are in one-to-one correspondence with T frequency domain subbands, and the fourth frequency domain indication information is used to indicate T frequency frequencies.
  • L 3 frequency domain subbands in the domain subband, 1 ⁇ L 3 ⁇ T, the fourth frequency domain indication information and the M 3 CQIs are used to determine the T CQIs, 1 ⁇ M 3 ⁇ T .
  • the terminal device sends the fourth frequency domain indication information and the M 3 CQIs.
  • the access network device After receiving the M 3 CQIs sent by the terminal device, the access network device obtains the CQIs of all T frequency domain subbands by interpolation.
  • the sending action of the terminal device of step 502 can be implemented by the transceiver 301.
  • the communication device in Figure 4 When the device is a terminal device or a chip of the terminal device, the sending of the terminal device in this step can also be implemented by the transceiver unit 401.
  • the receiving action of the access network device can be implemented by the transceiver 301.
  • the receiving action of the access network device may also be implemented by the transceiver unit 401.
  • FIG. 8 is a schematic diagram of a method for a terminal device to transmit a CQI.
  • Step 801 The terminal device generates fourth frequency domain indication information and M 3 CQIs.
  • the T CQIs are in one-to-one correspondence with the T frequency domain subbands, and the fourth frequency domain indication information is used to indicate L 3 frequency domain subbands in the T frequency domain subbands, L 3 ⁇ T,
  • the fourth frequency domain indication information and the M 3 CQIs are used to determine the T CQIs, 1 ⁇ M 3 ⁇ T.
  • This step can be implemented by the processor 300.
  • the communication device in FIG. 4 is a terminal device, or a chip of the terminal device, this step can also be implemented by the processing unit 402.
  • This step can be implemented by the processor 300.
  • the communication device in FIG. 4 is a terminal device, or a chip of the terminal device, this step can also be implemented by the processing unit 402.
  • Step 802 The terminal device sends the fourth frequency domain indication information and the M 3 CQIs.
  • the transmitting action of the terminal device in this step can be implemented by the transceiver 301.
  • the communication device in FIG. 4 is a terminal device and a chip of the terminal device, the transmission of the terminal device in this step may also be implemented by the transceiver unit 401.
  • the access network device receives the fourth frequency domain indication information and the M 3 CQIs.
  • the access network device determines L 3 frequency domain subbands according to the fourth frequency domain indication information.
  • the access network device obtains T CQIs of the T frequency domain subbands according to the fourth frequency domain indication information and the M 3 CQIs.
  • the method for the access network device to obtain the T CQIs of the T frequency domain subbands according to the fourth frequency domain indication information and the M 3 CQIs may refer to the first precoding indication according to the first frequency domain indication information by the access network device. The method of determining the T first elements by the information will not be described again.
  • FIG. 8 can be combined with the embodiment of FIG. 5 when the access network device and the terminal device transmit data via MIMO.
  • Figure 8 can also be implemented separately when the access network device and the terminal device do not transmit data via MIMO.
  • the terminal device does not need to feed back channel state information of all T subbands, reduces feedback overhead, and improves system resource utilization.
  • the M 1 fourth precoding indication information, the fourth frequency domain indication information, and the M 3 CQIs may be sent by the terminal device in one time unit; or may be sent by the terminal device in different time units. This is not limited here.
  • the order in which they are sent is not limited.
  • a time unit can be one subframe, one time slot, one or more time domain symbols, and the like.
  • one time domain symbol is an orthogonal frequency division multiplexing (OFDM) symbol.
  • the present application also provides a computer storage medium having instructions stored therein that, when run on a computer, cause the computer to perform the method performed by the terminal device in the above method embodiments.
  • the application also provides a computer storage medium in which instructions are stored in the computer readable storage medium.
  • the computer When it is run on a computer, the computer is caused to perform the method performed by the access network device in the above method embodiments.
  • Embodiments of the present application also provide a computer program product comprising instructions that, when executed by a computer, cause the computer to perform the functions performed by the terminal device in the above method.
  • Embodiments of the present application also provide a computer program product comprising instructions that, when executed by a computer, cause the computer to perform the functions performed by the access network device in the above method.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and the present invention should not be The implementation of the embodiments constitutes any limitation.

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Abstract

本申请提供一种信道状态信息的反馈方法和装置。该方法包括：生成第一频域指示信息和M1个第一预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足: WK=W1×W2 K；W1为Nt行R列的矩阵，W2 K为R行S列的矩阵；所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为W2 K中第r行第s列元素的因子,1<M1<T。发送所述第一频域指示信息和所述M1个第一预编码指示信息。该方法降低了信道状态信息的反馈开销。

Description

信道状态信息的反馈方法、通信装置和*** 技术领域
本申请涉及通信技术，尤其涉及一种信道状态的反馈方法、通信装置和***。
背景技术
长期演进(Long Term Evolution，LTE)和新空口(new radio，NR)技术采用了多输入多输出(Multiple Input and Multiple Output，MIMO)技术。如果基站可以获得全部或者部分下行信道信息的时候，可以采用预编码(Precoding)来提高信号传输质量或者速率。对于时分复用(Time Division Duplexing，TDD)***，无线信道的上下行具有互异性，可以根据上行信道来估计出下行的预编码加权矩阵。但是对于频分复用(Frequency Division Duplexing，FDD)***，由于上行和下行的载波频率不同，因此不能利用上行信道来获得下行的加权矩阵。在LTE FDD***中，一般采用终端用户反馈预编码指示的方式来获得预编码加权矩阵。
如果在MIMO***引入高精度的码本(codebook)结构，终端设备需要反馈的预编码矩阵指示(precoding matrix indication,PMI)的比特数很多。这就导致终端设备的反馈开销变大，资源利用率降低。
发明内容
本申请描述了一种信道状态信息的发送方法、通信装置和***。
第一方面，本申请实施例提供一种信道状态信息的发送方法，该方法可由终端设备或终端设备内的芯片执行。该方法包括：
生成第一频域指示信息和M1个第一预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
Figure PCTCN2017111723-appb-000001
W1为Nt行R列的矩阵，
Figure PCTCN2017111723-appb-000002
为R行S列的矩阵；
所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为
Figure PCTCN2017111723-appb-000003
中第r行第s列元素的因子,1<M1<T；
发送所述第一频域指示信息和所述M1个第一预编码指示信息
由于不需要发送所有的T个预编码指示信息，减少了反馈开销。
在一个示例中，生成M1个第二预编码指示信息；
所述第一频域指示信息和所述M1个第二预编码指示信息用于确定T个第二元素，所述 T个第二元素中的第k个第二元素为
Figure PCTCN2017111723-appb-000004
中第p行第q列的元素的因子,R＝2I,1≤r≤I,I为正整数,p＝r+I；
发送所述M1个第二预编码指示信息。例如，
Figure PCTCN2017111723-appb-000005
的第r行和第r+I行的元素分别作用于天线阵列同一个位置上不同极化的天线。而
Figure PCTCN2017111723-appb-000006
的第r行s列和第r+I行q列的元素的因子在频域的变化的规律可能是比较接近的。所以，针对
Figure PCTCN2017111723-appb-000007
的第r行s列和第r+I行q列的元素的因子，都用第一频域指示信息指示频域位置可以减少反馈开销。
在一个示例中，生成第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，L2<T；
所述第二频域指示信息和所述M2个第三预编码指示信息用于确定T个第三元素，所述T个第三元素中的第k个第三元素为
Figure PCTCN2017111723-appb-000008
中第u行第v列的元素的因子,1<M2<T,其中，u不等于r或者v不等于s；
发送所述第二频域指示信息和所述M2个第三预编码指示信息。
对于
Figure PCTCN2017111723-appb-000009
的不同的位置元素的因子有不同的频域指示可以提高反馈精度。
在一个示例中，生成M1个第四预编码指示信息，其中，S≥2,所述第一频域指示信息和所述M1个第四预编码指示信息用于确定T个第四元素，所述T个第四元素中的第k个第四元素为
Figure PCTCN2017111723-appb-000010
中第r行第t列的元素的因子,t不等于s；
发送所述M1个第四预编码指示信息。
在一个示例中，确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
确定与所述M1个频域子带一一对应的M1个第一元素，所述T个第一元素包括所述M1个第一元素，
所述生成第一频域指示信息，包括：
根据所述L1个频域子带生成所述第一频域指示信息；
根据所述M1个频域子带和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
第二方面，本申请还提供了一种信道状态信息的接收方法，该方法可由接入网设备或接入网设备内的芯片执行。该包括：
接收第一频域指示信息和M1个预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
Figure PCTCN2017111723-appb-000011
W1为Nt行R列的矩阵，
Figure PCTCN2017111723-appb-000012
为R行S列的矩阵；
根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素， 所述T个第一元素中的第k个第一元素为
Figure PCTCN2017111723-appb-000013
中第r行第s列的元素的因子,1<M1<T。
在一个示例中，接收M1个第二预编码指示信息；
根据所述第一频域指示信息和所述M1个第二预编码指示信息确定T个第二元素，所述T个第二元素中的第k个第二元素为
Figure PCTCN2017111723-appb-000014
中第p行第q列的元素的因子,R＝2I,1≤r≤I，I为正整数,p＝r+I。
在一个示例中，接收第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
根据所述第二频域指示信息和所述M2个第三预编码指示信息确定T个第三元素，所述T个第三元素中的第k个第三元素为
Figure PCTCN2017111723-appb-000015
中第u行第v列的元素的因子,1<M2<T,其中，u不等于r或者v不等于s。
在一个示例中，接收M1个第四预编码指示信息；
根据所述第一频域指示信息和所述M1个第四预编码指示信息确定T个第四元素，其中，S≥2,所述T个第四元素中的第k个第四元素为
Figure PCTCN2017111723-appb-000016
中第r行第t列的元素的因子,t不等于s。
在一个示例中，所述根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素，包括：
根据所述第一频域指示信息,确定所述T个频域子带中的M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
根据所述M1个第一预编码指示信息确定所述T个第一元素中的M1个第一元素，所述M1个频域子带与所述M1个第一元素一一对应；
根据所述第一频域指示信息和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
第三方面，本申请实施例提供一种通信装置，该通信装置可以是通信设备，也可以是芯片。该通信装置可以实现上述第一方面的方法，并具有相应的功能单元。所述功能单元可以通过硬件实现，也可以软件实现，或者通过硬件执行相应的软件来实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
该通信装置包括：
处理单元，用于生成第一频域指示信息和M1个第一预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
Figure PCTCN2017111723-appb-000017
W1为Nt行R列的矩阵，
Figure PCTCN2017111723-appb-000018
为R行S列的矩阵；
所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为
Figure PCTCN2017111723-appb-000019
中第r行第s列元素的因子,1<M1<T；
收发单元，用于发送所述第一频域指示信息和所述M1个第一预编码指示信息。
在一个示例中，所述处理单元，还用于生成M1个第二预编码指示信息，所述第一频域指示信息和所述M1个第二预编码指示信息用于确定T个第二元素，所述T个第二 元素中的第k个第二元素为
Figure PCTCN2017111723-appb-000020
中第p行第q列的元素的因子,R＝2I,I为正整数,1≤r≤I，p＝r+I；
所述收发单元，还用于发送所述M1个第二预编码指示信息。
在一个示例中，所述处理单元，还用于生成第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
所述第二频域指示信息和所述M2个第三预编码指示信息用于确定T个第三元素，所述T个第三元素中的第k个第三元素为
Figure PCTCN2017111723-appb-000021
中第u行第v列的元素的因子,1<M2<T,其中u不等于r或者v不等于s；
所述收发单元，还用于发送所述第二频域指示信息和所述M2个第三预编码指示信息。
在一个示例中，所述处理单元，还用于生成M1个第四预编码指示信息，其中，S≥2,所述第一频域指示信息和所述M1个第四预编码指示信息用于确定T个第四元素，所述T个第四元素中的第k个第四元素为
Figure PCTCN2017111723-appb-000022
中第r行第t列的元素的因子,t不等于s；
所述收发单元，还用于发送所述M1个第四预编码指示信息。
在一个示例中，述处理单元，还用于确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
所述处理单元，还用于确定与所述M1个频域子带一一对应的M1个第一元素，所述T个第一元素包括所述M1个第一元素；
所述处理单元，用于根据所述L1个频域子带生成所述第一频域指示信息；
所述处理单元，还用于根据所述M1个频域子带和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
第四方面，本申请实施例提供一种通信装置，该通信装置可以是通信设备，也可以是芯片。所述通信设备可以是接入网设备。该通信装置可以实现上述第二方面的方法，并具有相应的功能单元。所述功能单元可以通过硬件实现，也可以软件实现，或者通过硬件执行相应的软件来实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
该通信装置包括：
收发单元，用于接收第一频域指示信息和M1个预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
Figure PCTCN2017111723-appb-000023
W1为Nt行R列的矩阵，
Figure PCTCN2017111723-appb-000024
为R行S列的矩阵；
处理单元，用于根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素，所述T个第一元素中的第k个第一元素为
Figure PCTCN2017111723-appb-000025
中第r行第s列的元素的 因子,1<M1<T。
在一个示例中，所述收发单元，还用于接收M1个第二预编码指示信息；
所述处理单元，还用于根据所述第一频域指示信息和所述M1个第二预编码指示信息确定T个第二元素，所述T个第二元素中的第k个元第二素为
Figure PCTCN2017111723-appb-000026
中第p行第q列的元素的因子,R＝2I,I为正整数,1≤r≤I，p＝r+I。
在一个示例中，所述收发单元，还用于接收第二频域指示信息和M2个第三预编码指示信息，其中，所述第三频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
所述处理单元，还用于根据所述第二频域指示信息和所述M2个第三预编码指示信息确定T个第三元素，所述T个第三元素中的第k个第三元素为
Figure PCTCN2017111723-appb-000027
中第u行第v列的元素的因子,1<M2<T,其中u不等于r或者v不等于s。
在一个示例中，所述收发单元，还用于接收M1个第四预编码指示信息；
所述处理单元，还用于根据所述第一频域指示信息和所述M1个第四预编码指示信息确定T个第四元素，其中，S≥2,所述T个第四元素中的第k个第四元素为
Figure PCTCN2017111723-appb-000028
中第r行第t列的元素的因子,t不等于s。
在一个示例中，所述处理单元，用于根据所述第一频域指示信息,确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
所述处理单元，用于根据所述M1个第一预编码指示信息确定所述T个第一元素中的M1个第一元素，所述M1个频域子带与所述M1个第一元素一一对应；
所述处理单元，用于根据所述第一频域指示信息和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
对于上述第一方面到第四方面，还有如下可选设计。
在一个示例中，Nt为偶数，X1为
Figure PCTCN2017111723-appb-000029
行I列的矩阵，X1＝[b1 b2 … bI]，其中，向量bd为包含
Figure PCTCN2017111723-appb-000030
个元素的列向量，1≤d≤I，I为大于或等于1的正整数，Nt为偶数，
Figure PCTCN2017111723-appb-000031
为2I行S列的矩阵，
Figure PCTCN2017111723-appb-000032
为
Figure PCTCN2017111723-appb-000033
中的第i行第j列的元素。
在一个示例中，
Figure PCTCN2017111723-appb-000034
为如下表示之一：
Figure PCTCN2017111723-appb-000035
为
Figure PCTCN2017111723-appb-000036
的一个乘积因子；
Figure PCTCN2017111723-appb-000037
为
Figure PCTCN2017111723-appb-000038
的一个乘积因子的实部；
Figure PCTCN2017111723-appb-000039
为
Figure PCTCN2017111723-appb-000040
的一个乘积因子的虚部；
Figure PCTCN2017111723-appb-000041
为
Figure PCTCN2017111723-appb-000042
的幅度；
Figure PCTCN2017111723-appb-000043
为
Figure PCTCN2017111723-appb-000044
的相位；
Figure PCTCN2017111723-appb-000045
为
Figure PCTCN2017111723-appb-000046
的一个乘积因子的幅度；和
Figure PCTCN2017111723-appb-000047
为
Figure PCTCN2017111723-appb-000048
的一个乘积因子的相位。
在一个示例中，i＝r,j＝s，所述T个第一元素为
Figure PCTCN2017111723-appb-000049
在一个示例中，i＝p＝r+I,j＝q，所述T个第二元素为
Figure PCTCN2017111723-appb-000050
在一个示例中，i＝u,j＝v，且u不等于r或者v不等于s，所述T个第三元素为
Figure PCTCN2017111723-appb-000051
在一个示例中，i＝r,j＝t，且t不等于s，所述T个第四元素为
Figure PCTCN2017111723-appb-000052
在一个示例中，
Figure PCTCN2017111723-appb-000053
满足
Figure PCTCN2017111723-appb-000054
其中，
Figure PCTCN2017111723-appb-000055
表示宽带幅度，
Figure PCTCN2017111723-appb-000056
为非负实数，
Figure PCTCN2017111723-appb-000057
表示子带幅度，
Figure PCTCN2017111723-appb-000058
为非负实数，
Figure PCTCN2017111723-appb-000059
表示相位，
Figure PCTCN2017111723-appb-000060
为模为1的复数。
在一个示例中，
Figure PCTCN2017111723-appb-000061
为如下表示之一：
Figure PCTCN2017111723-appb-000062
为
Figure PCTCN2017111723-appb-000063
Figure PCTCN2017111723-appb-000064
为
Figure PCTCN2017111723-appb-000065
Figure PCTCN2017111723-appb-000066
为
Figure PCTCN2017111723-appb-000067
Figure PCTCN2017111723-appb-000068
为
Figure PCTCN2017111723-appb-000069
的实部；
Figure PCTCN2017111723-appb-000070
为
Figure PCTCN2017111723-appb-000071
的虚部；
Figure PCTCN2017111723-appb-000072
为
Figure PCTCN2017111723-appb-000073
Figure PCTCN2017111723-appb-000074
为
Figure PCTCN2017111723-appb-000075
的实部；
Figure PCTCN2017111723-appb-000076
为
Figure PCTCN2017111723-appb-000077
的虚部；
Figure PCTCN2017111723-appb-000078
为
Figure PCTCN2017111723-appb-000079
Figure PCTCN2017111723-appb-000080
为
Figure PCTCN2017111723-appb-000081
的实部；和
Figure PCTCN2017111723-appb-000082
为
Figure PCTCN2017111723-appb-000083
的虚部。
在一个示例中，W1为单位矩阵。此时W＝W2或
Figure PCTCN2017111723-appb-000084
第五方面，本申请实施例提供一种信道质量信息的发送方法，该方法包括：
生成第四频域指示信息和M3个CQI，其中，所述T个CQI与T个频域子带的一一对应，所述第四频域指示信息用于指示T个频域子带中的L3个频域子带，1≤L3<T，所述第四频域指示信息和所述M3个CQI用于确定所述T个CQI，1<M3<T；
发送所述第四频域指示信息和所述M3个CQI。
第六方面，本申请还提供一种信道质量信息的接收方法，该方法包括：
接收第四频域指示信息和M3个CQI；
根据所述第四频域指示信息确定T个频域子带中的L3个频域子带，1≤L3<T；
根据所述第四频域指示信息和所述M3个CQI获得所述T个频域子带的T个CQI。且所述T个CQI与T个频域子带的一一对应。
第七方面，本申请实施例提供一种通信装置，该通信装置可以是通信设备，也可以是芯片。所述通信设备可以是终端设备。该通信装置可以实现上述第五方面的方法，并具有相应的功能单元。所述功能单元可以通过硬件实现，也可以软件实现，或者通过硬件执行相应的软件来实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
该通信装置包括：
处理单元，生成第四频域指示信息和M3个CQI，其中，所述T个CQI与T个频域子带的一一对应，所述第四频域指示信息用于指示T个频域子带中的L3个频域子带，L3<T，所述第四频域指示信息和所述M3个CQI用于确定所述T个CQI，1<M3<T；
收发单元，用于发送所述第四频域指示信息和所述M3个CQI。
第八方面，本申请实施例提供一种通信装置，该通信装置可以是通信设备，也可以是芯片。所述通信设备可以是接入网设备。该通信装置可以实现上述第六方面的方法，并具有相应的功能单元。所述功能单元可以通过硬件实现，也可以软件实现，或者通过硬件执行相应的软件来实现。所述硬件或软件包括一个或多个与上述功能相对应的模块。
该通信装置包括：
收发单元，用于接收第四频域指示信息和M3个CQI；
处理单元，用于根据所述第四频域指示信息确定T个频域子带中的L3个频域子带，L3<T；
所述处理单元，还用于根据所述第四频域指示信息和所述M3个CQI获得所述T个频域子带的T个CQI。且所述T个CQI与T个频域子带的一一对应。
第九方面，本申请实施例提供了一种计算机存储介质，用于储存为上述通信装置所用的计算机软件指令，其包含用于执行上述第一方面或第二方面或第五方面或第六方面所涉及的程序。
第十方面，本申请实施例提供一种计算机程序产品，其包含指令，当所述计算机程序被计算机所执行时，该指令使得计算机执行上述第一方面或第二方面或第五方面或第六方面所述的方法。
第十一方面，本申请实施例提供了一种***，该***包括上述通信装置。
第十二方面，本申请实施例提供了一种芯片***，该芯片***包括处理器，用于支持上述通信装置实现上述方面中所涉及的功能，例如，例如生成或处理上述方法中所涉及的数据和/或信息。在一种可能的设计中，所述芯片***还可以包括存储器，所述存储器，用于保存数据发送设备必要的程序指令和数据。该芯片***，可以由芯片构成，也可以包含芯片和其他分离器件。
相较于现有技术，本申请提供的信道状态信息的发送方法、通信装置和***，减少了终端设备反馈信道状态信息的比特数。进而降低了***开销，提高了***的资源利用率。
附图说明
图1为本申请提供的无线通信***示意图。
图2为上述无线通信***中，接入网设备的一种可能的结构示意图。
图3为上述无线通信***中，终端设备的一种可能的结构示意图。
图4是根据本申请实施例的通信装置的示意性框图。
图5为本申请提供的信道状态信息反馈方法的示意图。
图6a为本申请提供的终端设备确定预编码指示信息的示意图。
图6b为本申请提供的接入网设备获得T个第一元素的示意图。
图7为本申请提供的信道状态信息在频域变化的示意图。
图8为本申请提供的终端设备反馈CQI的示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。需要说明的是，在不冲突的情况下，本发明各个实施例中的技术方案或特征可以相互组合。
需要说明的的是，本申请的信道状态信息的反馈方法可由通信装置执行。在网络侧，该通信装置可以是接入网设备或接入网设备内的芯片，即可以由接入网设备或接入网设备内的芯片执行本申请的信道状态信息的反馈方法；在终端设备侧，该通信装置可以是终端设备或终端设备内的芯片，即可以由终端设备或终端设备内的芯片执行本申请的信道状态信息的反馈方法。
为方便说明，本申请，以通信装置为接入网设备或终端设备为例，对无线通信方法进行说明，对于通信装置为接入网设备内的芯片或终端设备内的芯片的实现方法，可参考基接入网设备或终端设备的信道状态信息的反馈方法的具体说明，不再重复介绍。
如图1所示，为本申请的一种可能的网络架构示意图。包括至少一个终端设备10，通过无线接口与接入网设备20通信，为清楚起见，图中只示出一个接入网设备和一个终端设备。接入网设备向终端设备发送数据的信道是下行信道。终端设备向接入网设备发送数据的信道是上行信道。
其中，终端设备是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等等。
接入网设备，是一种将终端设备接入到无线网络的设备，包括但不限于：5G中的gNB、演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基 站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(BaseBand Unit，BBU)、基站(g nodeB，gNB)、传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心等，此外，还可以包括Wifi接入点(access point，AP)等。
进一步地，上述接入网设备20的一种可能的结构示意图可以如图2所示。其中，该接入网设备20可以包括：控制器或处理器201(下文以处理器201为例进行说明)以及收发器202。控制器/处理器201有时也称为调制解调器处理器(modem processor)。调制解调器处理器201可包括基带处理器(baseband processor，BBP)(未示出)，该基带处理器处理经数字化的收到信号以提取该信号中传达的信息或数据比特。BBP通常是实现在调制解调器处理器201内的一个或多个数字信号处理器(digital signal processor，DSP)中。BBP也可以由分开的集成电路(integrated circuit，IC)来实现。
收发器202可以用于支持接入网设备20与终端设备之间收发信息，以及支持与终端设备之间进行无线电通信。在上行链路，来自终端设备的上行链路信号经由天线接收。由收发器202调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。并进一步由处理器201进行处理来恢复终端设备所发送的业务数据和/或信令信息。在下行链路上，业务数据和/或信令消息由终端设备进行处理，并由收发器202进行调制来产生下行链路信号，并经由天线发射给终端设备。所述接入网设备20还可以包括存储器203，可以用于存储该接入网设备20的程序代码和/或数据。收发器202可以包括独立的接收器和发送器电路，也可以是同一个电路实现收发功能。该接入网设备20还可以包括通信单元204，用于支持所述接入网设备20与其他网络实体进行通信。例如,用于支持所述接入网设备102与核心网的网络设备等进行通信。
图3为上述无线通信***中，终端设备的一种可能的结构示意图。该终端设备能够执行本发明实施例提供的方法。该终端设备可以是图1中的终端设备10。所述终端设备包括收发器301，处理器300，存储器303。处理器300可以包括应用处理器(application processor)302和调制解调器处理器(modem processor)304。
收发器301可以调节(例如，模拟转换、滤波、放大和上变频等)输出采样并生成上行链路信号。上行链路信号经由天线发射给接入网设备。在下行链路上，天线接收接入网设备发射的下行链路信号。收发器301可以调节(例如，滤波、放大、下变频以及数字化等)从天线接收的信号并提供输入采样。
调制解调器处理器304有时也称为控制器或处理器，可包括基带处理器(baseband processor,BBP)(未示出)，该基带处理器处理经数字化的收到信号以提取该信号中传达的信息或数据比特。
在一个设计中，调制解调器处理器(modem processor)304可包括编码器3041，调制器3042，解码器3043，解调器3044。编码器3041用于对待发送信号进行编码。例如，编码器3041可用于接收要在上行链路上发送的业务数据和/或信令消息，并对业务数据和信令消息进行处理(例如，格式化、编码、或交织等)。调制器3042用于对编码器3041的输出信号进行调制。例如，调制器可对编码器的输出信号(数据和/ 或信令)进行符号映射和/或调制等处理，并提供输出采样。解调器3044用于对输入信号进行解调处理。例如，解调器3044处理输入采样并提供符号估计。解码器3043用于对解调后的输入信号进行解码。例如，解码器3043对解调后的输入信号解交织、和/或解码等处理，并输出解码后的信号(数据和/或信令)。编码器3041、调制器3042、解调器3044和解码器3043可以由合成的调制解调处理器304来实现。
调制解调器处理器304从应用处理器302接收可表示语音、数据或控制信息的数字化数据，并对这些数字化数据处理后以供传输。所属调制解调器处理器可以支持多种通信***的多种无线通信协议中的一种或多种，例如LTE,新空口(New Radio,NR)，通用移动通信***(Universal Mobile Telecommunications System，UMTS)，高速分组接入(High Speed Packet Access，HSPA)等等。可选的，调制解调器处理器304中也可以包括一个或多个存储器。
可选的，该调制解调器处理器304和应用处理器302可以是集成在一个处理器芯片中。
存储器303用于存储用于支持所述终端设备通信的程序代码(有时也称为程序，指令，软件等)和/或数据。
需要说明的是，该存储器203或存储器303可以包括一个或多个存储单元，例如，可以是用于存储程序代码的处理器201或调制解调器处理器304或应用处理器302内部的存储单元，或者可以是与处理器201或调制解调器处理器304或应用处理器302独立的外部存储单元，或者还可以是包括处理器201或调制解调器处理器304或应用处理器302内部的存储单元以及与处理器201或调制解调器处理器304或应用处理器302独立的外部存储单元的部件。
处理器201和调制解调器处理器304可以是相同类型的处理器，也可以是不同类型的处理器。例如可以实现在中央处理器(Central Processing Unit，CPU)，通用处理器，数字信号处理器(Digital Signal Processor，DSP)，专用集成电路(Application-Specific Integrated Circuit，ASIC)，现场可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件、其他集成电路、或者其任意组合。处理器201和调制解调器处理器301可以实现或执行结合本发明实施例公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能器件的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合或者片上***(system-on-a-chip，SOC)等等。
如图4所示，给出了一种通信装置400。该通信装置能够应用于图1所示的通信***中。该通信装置400可以实现本申请实施例中终端设备的通信方法，也可以实现本申请实施例中接入网设备的通信方法。该装置200包括至少一个处理单元402，收发单元401，可选地，还包括存储单元403。所述处理单元402、收发单元401、存储单元403通过通过电路相互连接。所述存储单元403用于存储执行本申请方案的应用程序代码，并由处理单元402来控制执行。所述处理单元402用于执行所述存储单元403中存储的应用程序代码。
当通信装置400是接入网设备时，收发单元401可以是收发器202，存储单元403可以是存储器203，处理单元402可以是控制器/处理器201；当通信装置是终端设备 时，收发单元401可以是收发器201，存储单元403可以是存储器303，处理单元402可以是处理器300。
在一种可能的设计中，当通信装置400为接入网设备内的芯片或终端设备内的芯片时，处理单元402可以是处理器，收发单元401可以是输入/输出接口、管脚或电路等。该处理单元402可执行存储单元403存储的计算机执行指令，以使该芯片执行本申请实施例中的无线通信方法。可选地，所述存储单元为所述芯片内的存储单元，如寄存器、缓存等，所述存储单元还可以是所述基站或终端内位于所述芯片外部的存储单元，如ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM等。
本申请中，插值包括但不限于以下的插值方法：
线性插值，多项式插值，二次插值，小波插值。
假设矩阵A的a行b列的元素c,c可以是变量也可以是常数。则本申请中，矩阵A的a行b列的元素c的因子有如下定义：
A的a行b列的元素c的因子可以是c本身；A的a行b列的元素c的因子也可以是c的一个乘积因子。c的一个乘积因子定义如下：
如果c＝c1×c2×……cn，则c1到中cn的任意一个都是c的一个乘积因子。
A的a行b列的元素c的因子也可以是c的一个乘积因子中的实部或虚部。
A的a行b列的元素c的因子也可以是c的实部或虚部。
A的a行b列的元素c的因子也可以是c的一个乘积因子中的幅度或相位。例如，c1＝D×ejα。D为实数，就是乘积因子c1的幅度。ejα就是乘积因子c1的相位。
在本申请中，***带宽是分配给接入网设备，且用于和该接入网设备内的终端设备收发数据的带宽。***带宽可以包括下行***带宽，和上行***带宽。
在本申请中，***带宽可以分成多个频域子带。例如，***带宽为10MHz,分为10个频域子带，每个频域子带的频域带宽是1MHz。频域子带简称为子带。
本申请中，信道状态信息可以包括秩指示，预编码指示信息和信道质量指示(channel quality indicator,CQI)中的一种或多种。预编码指示信息是指示预编码矩阵，或指示预编码矩阵的元素，或预编码矩阵元素的因子的信息。预编码指示信息可以是PMI。
在MIMO***中，一种高精度的码本结构定义如下。
预编码矩阵W由公式(1)满足
W＝W1×W2   (1)
其中，W1为块对角矩阵
Figure PCTCN2017111723-appb-000085
W1为Nt行2I列的矩阵，
Figure PCTCN2017111723-appb-000086
为2I行S列的矩阵。每个块矩阵X中包含I个向量，X＝[b1 b2 ... bI]，bd为列向量，1≤d≤I。例如，不同的向量bd相互正交。可选的，bd是 二维离散傅里叶变换(Discrete Fourier Transform,DFT)向量。也就是说，bd可以表示为两个一维DFT向量的克罗内克积(Kronecker Product)。
当秩＝1时(W2的列数目为1)，W2满足公式(3)
Figure PCTCN2017111723-appb-000087
当秩＝2时(W2的列数目为2)，W2满足公式
Figure PCTCN2017111723-appb-000088
在公式(3)、(4)中，矩阵W2的第r行第s列的元素的乘积因子
Figure PCTCN2017111723-appb-000089
表示宽带和子带的幅度，
Figure PCTCN2017111723-appb-000090
Figure PCTCN2017111723-appb-000091
zr,s表示相位信息。例如，zr,s的取值范围可以为
Figure PCTCN2017111723-appb-000092
zr，s的取值范围还可以为
Figure PCTCN2017111723-appb-000093
其中r表示W2矩阵的行，s表示W2矩阵的列。当天线阵列是双极化天线阵时，W2的第一行到第I行中的元素作用对一个极化方向的天线上的数据进行加权；W2的第I+1行到第2I行中的元素对另一个极化方向的天线上的数据进行加权。W2第r行和第r+I行的元素分别作用到天线阵列同一个位置上不同极化的天线上发送的数据进行加权，此时1≤r≤I。
对于高精度码本，终端设备需要反馈W2中每个元素中乘积因子
Figure PCTCN2017111723-appb-000094
zr,s的值。这就导致需要反馈的预编码指示信息的比特数目很多。例如，当终端设备按照秩＝1反馈PMI，在公式(2)中的参数I为4，且反馈10个频域子带的预编码指示信息的条件下，需要反馈大约需要270个比特。当终端设备按照秩＝2反馈预编码指示信息，在相同条件下大约需要反馈540个比特。这就导致终端设备的反馈开销很大，资源利用率降低。
基于上述图1所示的通信***，本申请提供的无线通信中的信道状态信息的反馈方法， 旨在解决如上的技术问题。
图5为本申请提供的无线通信方法的示意图。在图5中，以发送设备为终端设备，接收设备为接入网设备为例对申请提供的无线通信方法进行说明。
步骤501：终端设备生成第一频域指示信息和M1个第一预编码指示信息。
在步骤501中，终端设备生成第一频域指示信息和M1个第一预编码指示信息。所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
Figure PCTCN2017111723-appb-000095
W1为Nt行R列的矩阵，
Figure PCTCN2017111723-appb-000096
为R行S列的矩阵。例如，Nt是发送天线端口的数目，S是数据传输的层数，也是秩的数目。
对于k的取值范围，1≤k≤T或0≤k≤T-1。当T个频域子带中的起始编号为0时，0≤k≤T-1；当T个频域子带中的起始编号为1时，1≤k≤T。
T个频域子带是***带宽意味着***带宽由该T个频域子带组成。T个频域子带也可以是***带宽的一部分。例如，***带宽为10MHz,分为10个频域子带。当T＝10，T个频域子带可以正好构成***带宽。当T<10,T个频域子带是***带宽的一部分。
T个频域子带与T个预编码矩阵一一对应指的是在一个频域子带上需要一个预编码矩阵。而这个预编码矩阵就是终端设备通过预编码指示信息推荐给接入网设备的。当接入网设备在一个频域子带上给终端设备发送数据时，终端设备希望接入网设备使用对应于这个频域子带的预编码矩阵对数据预编码。
所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为
Figure PCTCN2017111723-appb-000097
中第r行第s列元素的因子,1<M1<T。
在一个示例中，
Figure PCTCN2017111723-appb-000098
中第r行第s列的元素
Figure PCTCN2017111723-appb-000099
1≤r≤R,1≤s≤S。此时，
Figure PCTCN2017111723-appb-000100
相当于上述的a行b列矩阵A，r＝a，b＝s。
Figure PCTCN2017111723-appb-000101
相当于A的a行b列的元素c。
Figure PCTCN2017111723-appb-000102
分别相当于c的乘积因子c1，c2，c3。
Figure PCTCN2017111723-appb-000103
表示宽带幅度信息，
Figure PCTCN2017111723-appb-000104
在所有的频域子带都一样，不随频域子带k变化。
Figure PCTCN2017111723-appb-000105
表示子带幅度信息，不同的k，
Figure PCTCN2017111723-appb-000106
的可以不同。
Figure PCTCN2017111723-appb-000107
表示相位，不同的k，
Figure PCTCN2017111723-appb-000108
可以不同。也就是说，
Figure PCTCN2017111723-appb-000109
的值随着子带k而变化。
假设T＝13，T个频域子带中的起始编号为0时，则0≤k≤12。并假设
Figure PCTCN2017111723-appb-000110
中第r行第s列元素的因子为
Figure PCTCN2017111723-appb-000111
则有13个第一元素，分别为
Figure PCTCN2017111723-appb-000112
T个第一元素中的第k个第一元素，就是
Figure PCTCN2017111723-appb-000113
0≤k≤12。例如，T个第一元素中的第0个第一元素为
Figure PCTCN2017111723-appb-000114
第1个第一元素为
Figure PCTCN2017111723-appb-000115
在一个示例中，
Figure PCTCN2017111723-appb-000116
Nt为偶数，X1为
Figure PCTCN2017111723-appb-000117
行I列的矩阵，X1＝[b1 b2 … bI]，其中，向量bd为包含
Figure PCTCN2017111723-appb-000118
个元素的列向量，1≤d≤I，I为大于或等于1的正整数。Nt为偶数。此时，R＝2I，Wk为2I行S列的矩阵。
Figure PCTCN2017111723-appb-000119
为
Figure PCTCN2017111723-appb-000120
中的第i行第j列的元素，1≤i≤R,1≤j≤S。
Figure PCTCN2017111723-appb-000121
可以满足公式(1)-(4)中 的预编码矩阵的结构。例如，Wk、W1和
Figure PCTCN2017111723-appb-000122
分别相当于公式(1)-(4)中的W，W1和W2。W2是
Figure PCTCN2017111723-appb-000123
的通用结构。
在一个示例中，W1为单位矩阵。此时W＝W2或
Figure PCTCN2017111723-appb-000124
本步骤的可以由处理器300来实现。当图4中的通信装置是终端设备，或是终端设备的芯片时，本步骤也可以由处理单元402实现。
步骤502：终端设备发送所述第一频域指示信息和所述M1第一个预编码指示信息。
在一个示例中，图6a给出了终端设备确定预编码指示信息的示意图。
步骤601a:终端设备确定T个频域子带中M1个频域子带，M1个频域子带包括L1个频域子带。
在步骤601a中，确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1。而且，终端设备确定与所述M1个频域子带一一对应的M1个第一元素，所述T个第一元素包括所述M1个第一元素。由于M1个第一元素是
Figure PCTCN2017111723-appb-000125
的元素的因子，所以这M1个第一元素分别对应于这M1个频域子带。
例如，T＝13，M1＝4，且终端设备确定的M1个频域子带为子带0，子带3，子带8和子带12。且M1＝L1。
步骤602a:终端设备根据所述L1个频域子带生成所述第一频域指示信息。
例如，终端设备根据子带0，子带3，子带8和子带12的编号(或所索引)生成第一频域指示信息。
步骤603a:终端设备根据M1频域子带和M1个第一元素采用插值方式确定其余的T-M1个元素。
在步骤603a中，根据所述M1频域子带和所述M1个第一元素采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个元素。
在一个示例中，图6b给出了接入网设备根据预编码指示信息获得T个第一元素的示意图。
步骤601b:接入网设备根据第一频域指示信息,确定T个频域子带中M1频域子带。
在步骤601b中，根据所述第一频域指示信息,确定所述T个频域子带中M1频域子带，所述M1频域子带包括所述L1个频域子带，L1≤M1。
步骤602b:接入网设备根据M1个第一预编码指示信息确定T个第一元素中的M1个第一元素。
在步骤602b中，接入网设备根据所述M1个第一预编码指示信息确定所述T个第一元素中的所述M1个第一元素，所述M1个第一元素与所述M1频域子带一一对应。
步骤603b:接入网设备根据所述第一频域指示信息和所述M1个第一元素采用插值方式确定其余的T-M1个元素。
在步骤602b中，接入网设备根据根据所述第一频域指示信息和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
针对603a和603b中的插值，下面有具体的描述，此处不再描述。
图7给出了当
Figure PCTCN2017111723-appb-000126
为8行2列的矩阵，且r＝2,s＝1时，
Figure PCTCN2017111723-appb-000127
在不同的频域子带上变化的示意图。
Figure PCTCN2017111723-appb-000128
是
Figure PCTCN2017111723-appb-000129
中第2行第1列的相位因子。在图7中，***带宽包括13个 子带，这12个子带的编号分别为0-12。从图7中可以看出，对于
Figure PCTCN2017111723-appb-000130
假设k表示子带编号，0≤k≤12。子带3、子带8是相位连续的拐点位置。拐点位置是指的两个拐点之间的子带的
Figure PCTCN2017111723-appb-000131
满足单调递增或者单调递减特点。例如，子带3和子带8之间的子带上的相位因子
Figure PCTCN2017111723-appb-000132
满足单调递增或者单调递减特点。子带3和子带8也可以认为是相位因子
Figure PCTCN2017111723-appb-000133
的局部最小点或者局部最大点。只要子带3和子带8之间的子带上的相位因子
Figure PCTCN2017111723-appb-000134
满足用一个分布函数，比如线性分布，那么就可以采用子带3和子带8上的
Figure PCTCN2017111723-appb-000135
作为参数来表示子带3和子带8之间的任何子带上的
Figure PCTCN2017111723-appb-000136
在一个示例中，T个频域子带中的L1个频域包括
Figure PCTCN2017111723-appb-000137
个拐点所在子带；还可以包括***带宽中第一个的子带(例如，图7中子带编号0的子带)；还可以包括***带宽中最后的子带(例如，图7中子带编号12的子带)。
结合图7，L1＝4，L1个子带分别为子带编号为0、3、8、12的子带。
在一个示例中，M1＝L1，这M1个第一预编码指示信息指示了M1个第一元素。且所述M1个元素分别为所述L1个频域子带上
Figure PCTCN2017111723-appb-000138
的第r行第s列的元素。假设r＝2,s＝1。结合图7，并以上述的相位因子
Figure PCTCN2017111723-appb-000139
为例。M1个第一预编码指示信息指示的M1个第一元素可以是对应于频域子带编号为0、3、8、12的预编码矩阵中的
Figure PCTCN2017111723-appb-000140
的第2行第1列的元素的相位因子
Figure PCTCN2017111723-appb-000141
由于M1<T，终端没有反馈所有T个频域子带的预编码指示信息，终端设备节省了反馈开销。
在一个示例中，所述M1个第一预编码指示信息携带了显示指示所述M1个元素的信息。例如，该M1个元素为
Figure PCTCN2017111723-appb-000142
的取值范围为
Figure PCTCN2017111723-appb-000143
该M1个第一预编码指示信息中的一个需要2个比特指示，在这种情况下，M1个第一预编码指示信息需要2 M1个比特。显示指示包括了全部比特指示方式，和差分的指示方式。当一个指示信息指示的元素的状态的数目是Q时，为了表示这Q个状态。需要
Figure PCTCN2017111723-appb-000144
个比特表示。如果用
Figure PCTCN2017111723-appb-000145
个比特表示这Q个状态。就是全部比特指示的方式。
Figure PCTCN2017111723-appb-000146
表示对x上取整。差分指示方式是有一个参考点，指示信息值指示的是一个参考点的差分值，比如差分值用一个比特指示。
以M1个第一预编码指示信息用于指示相位因子
Figure PCTCN2017111723-appb-000147
为例，M1个第一预编码指示信息显示指示N个元素至少包括以下三种方式。假设r＝2,s＝1，第一频域指示信息指示了频域子带编号为0、3、8、12的频域子带。
显示指示方式1：
M1个第一预编码指示信息按照全部比特指示的方式指示M1个
Figure PCTCN2017111723-appb-000148
的值。例如，第一频域指示信息指示了频域子带编号为0、3、8、12的频域子带的
Figure PCTCN2017111723-appb-000149
k＝0,3,8或12。
显示指示方式2：
M1个第一预编码指示信息中的其中一个按照全部比特指示的方式一个频域子带的
Figure PCTCN2017111723-appb-000150
而其余M1-1个第一预编码指示信息指示的是其余M1-1个频域子带的相位因子和这个相位因子的差分值。例如，M1＝4。M1-1个第一预编码指示信息中的第一个指示信息指示了频域子带编号为0的
Figure PCTCN2017111723-appb-000151
k＝0。其余3个第一预编码指示信息分别指示了子带编号为3、8、12相位因子
Figure PCTCN2017111723-appb-000152
(k＝3,8,12)和
Figure PCTCN2017111723-appb-000153
的差分值Δ1，Δ2，Δ3。在这种情 况下，
Figure PCTCN2017111723-appb-000154
显示指示方式3：
M1个第一预编码指示信息中的一个指示信息指示其中一个频域子带的相位因子
Figure PCTCN2017111723-appb-000155
的绝对值，其余M1-1个第一预编码指示信息指示以及相邻子带之间的差值。此处的相邻子带是第一频域指示信息指示的频域子带中相邻的频域子带。例如，第一频域指示信息指示了频域子带编号为0、3、8、12的频域子带。编号为0、3的频域子带相邻，编号为3、8的子带相邻，依次类推。
比如，M1＝4。在子带0位置的
Figure PCTCN2017111723-appb-000156
由M1个预编码指示信息中的第一个指示确定，而第二个预编码指示信息指示了子带编号3和子带编号0的差分值Δ1。同理，第三个预编码指示信息指示了子带编号8和子带编号3的差分值Δ2。第4个预编码指示信息指示了子带编号12和子带编号8的差分值Δ3。
在这种情况下，
Figure PCTCN2017111723-appb-000157
在一个示例中，给出了图6a步骤603a和图6a步骤603b的根据M1个第一元素采用插值方式确定其余的T-M1个元素的方法。结合图7，第一频域指示信息指示了频域子带编号为0、3、8、12的频域子带。M1＝L1＝4。M1个第一预编码指示信息携带了频域子带编号为0、3、8、12上的相位因子
Figure PCTCN2017111723-appb-000158
r＝2,s＝1。其他子带上的
Figure PCTCN2017111723-appb-000159
可以通过插值方式得到。当频域子带编号为x,y的zx r,s、zy r,s由第一预编码指示信息显示指示时，而频域子带编号为x,y之间的zl r,s通过插值得到，其中x＜l＜y。例如，根据频域子带编号为0、3的相位因子插值得到频域子带编号为1、2的相位因子。根据频域子带编号为3、8的相位因子插值得到频域子带编号为4-7的相位因子。依次类推。插值方式(或插值函数)可以由协议预定义规定。也可以由接入网设备通过信令向终端设备通知插值方式的类型。zl r,s的插值方式可以表示为zl r,s＝f(z0 r,s,z3 r,s,z8 r,s,z12 r,s)，l不等于0,3,8，或12。f(·)表示插值方式。
可选的，M1>L1。比如在***带宽中，第一个子带和最后一个频域子带的相位因子
Figure PCTCN2017111723-appb-000160
总是需要被终端设备上报，因此为了节省指示信息的开销，指示信息中不包括第一个频域子带和最后一个频域子带的编号。而M1个第一预编码指示信息包括L1个子带上的第一预编码指示信息以及第一个子带和最后一个子带上的第一预编码指示信息。在这种情况下，M1＝L1+2。
在一个示例中，给出了至少有两行的
Figure PCTCN2017111723-appb-000161
的元素的因子都用第一频域指示信息指示频域位置。接入设备的天线阵列是双极化天线阵，R＝2I，
Figure PCTCN2017111723-appb-000162
的第r行和第p＝r+I行的元素分别作用于天线阵列同一个位置上不同极化的天线。而W2中对应于同一个位置上不同极化的天线的元素在频域的拐点可能是相同或比较接近的。所以，终端设备还生成M1个第二预编码指示信息。所述第一频域指示信息和所述M1个第二预编码指示信息用于确定T个第二元素，所述T个第二元素的第k个元素为
Figure PCTCN2017111723-appb-000163
中第p行第q列的元素的因子,M2<T,R＝2I,此时，1≤r≤I，I为正整数,p＝r+I。终端设备发送所述M1个第二预编码指示信息。结合图7，以
Figure PCTCN2017111723-appb-000164
的相位因子为
Figure PCTCN2017111723-appb-000165
为例。假设
Figure PCTCN2017111723-appb-000166
为8行2列的矩阵，r＝2,s＝1,I＝4。则
Figure PCTCN2017111723-appb-000167
中第2行第1列的相位因子
Figure PCTCN2017111723-appb-000168
和第6行第1列的相位因子在频域的拐点都由第一频域指示信息指示。例如，第一频域指示信息指示了频 域子带编号为0，3,8,12的频域子带。接入网设备收到所述第一频域指示信息和所述M1个第二预编码指示信息后，根据第一频域指示信息和所述M1个第二预编码指示信息，可以确定出T个子带的预编码矩阵
Figure PCTCN2017111723-appb-000169
第r+I行第q列的相位因子。所以，针对
Figure PCTCN2017111723-appb-000170
的第r行和第r+I行的元素，都用第一频域指示信息指示频域位置可以减少反馈开销。
关于终端设备如何生成M1个第二预编码指示信息，参见上述终端设备生成M1个第一预编码指示信息的描述，不再赘述。关于终端设备如何确定T个第二元素，参见终端设备确定T个第一元素的方法。不再赘述。同理，对接入网设备如何根据第一频域指示信息和M1个第二预编码指示信息确定T个第二元素，参见上述接入网设备根据第一频域指示信息和M1个第一预编码指示信息确定T个第一元素的方法，不再赘述。
在一个示例中，给出了
Figure PCTCN2017111723-appb-000171
至少有两个不同位置的元素的因子有不同的频域指示。
Figure PCTCN2017111723-appb-000172
不同位置的元素是
Figure PCTCN2017111723-appb-000173
中行或列至少有一个不同的元素。在此示例中，终端设备生成第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，L2<T。所述第二频域指示信息和所述M2个第三预编码指示信息用于确定T个第三元素，所述T个第三的第k个元素为
Figure PCTCN2017111723-appb-000174
中第u行第v列的元素的因子,1<M2<T,其中u不等于r，或者v不等于s,1≤u≤R,1≤v≤S。终端设备发送所述第二频域指示信息和所述M2个第三预编码指示信息。在此示例中，至少有两个
Figure PCTCN2017111723-appb-000175
中不同位置的元素的频域指示信息不同，分别为第一频域指示信息和第二频域指示信息，提高PMI的反馈精度。
如公式(3)、(4)中
Figure PCTCN2017111723-appb-000176
取值范围所示，
Figure PCTCN2017111723-appb-000177
的任意一列宽带幅度最大的
Figure PCTCN2017111723-appb-000178
作为该列其他宽带幅度的相对参考点。所以，预编码指示信息(第一预编码指示信息，第一预编码指示信息等预编码等指示信息)可以不用指示每一列幅度最大的
Figure PCTCN2017111723-appb-000179
同理，对
Figure PCTCN2017111723-appb-000180
zr,s也一样。也就是说，对预编码指示信息指示的元素，由于参考点上的元素的通常是常数，可以不用指示。为了提高反馈精度，
Figure PCTCN2017111723-appb-000181
中不同位置的元素都可以有自己的频域指示信息。例如，对每个相位信息zr,s都有相应的频域指示信息来指示zr,s的拐点位置。但是，每一列参考点位置的zr,s不需要上报。这样做，既可以提高反馈精度，又可以减少反馈开销。关于终端设备如何生成第二频域指示信息和M2个第三预编码指示信息，参见上述终端设备生成第一频域指示信息和M1个第一预编码指示信息的描述，不再赘述。关于终端设备如何确定T个第三元素，参见终端设备确定T个第一元素的方法。不再赘述。同理，对接入网设备如何根据根据第二频域指示信息和M2个第三预编码指示信息确定T个第三元素，参见上述接入网设备根据第一频域指示信息和M1个第一预编码指示信息确定T个第一元素的方法，不再赘述。
在一个示例中，R≥2，也就是说，
Figure PCTCN2017111723-appb-000182
中至少有两列。此示例中，
Figure PCTCN2017111723-appb-000183
的至少两个相同行，但不同列的元素的因子频域指示信息相同。终端设备生成M1个第四预编码指示信息，所述第一频域指示信息和所述M1个第四预编码指示信息用于确定T个第四元素，所述T个第四元素中的第k个元素为
Figure PCTCN2017111723-appb-000184
中第r行第t列的元素的因子,t不等于s，1≤r≤R,1≤t≤S。终端设备发送所述M1个第四预编码指示信息。对于
Figure PCTCN2017111723-appb-000185
的同行不同列的元素有都用相同的第一频域指示信息频域指示可以降低反馈开销。关于终端 设备如何生成M1个第四预编码指示信息，参见上述终端设备生成M1个第一预编码指示信息的描述，不再赘述。关于终端设备如何确定T个第四元素，参见终端设备确定T个第一元素的方法。不再赘述。同理，对接入网设备如何根据第一频域指示信息和M1个第四预编码指示信息确定T个第四元素，参见上述接入网设备根据第一频域指示信息和M1个第一预编码指示信息确定T个第一元素的方法，不再赘述。
在一个示例中，上述的R＝2I，p＝r+I，u不等于r，u也不等于r+I,q＝s,1≤v≤S。
Figure PCTCN2017111723-appb-000186
的第r行s列和第r+I行s列元素的因子可以共用第一频域指示信息。
Figure PCTCN2017111723-appb-000187
的第u行v列元素的因子另外用第二频域指示信息。这样做，终端设备既可以节省反馈开销，又提高反馈精度。
在一个示例中，上述的R＝2I，p＝r+I，u不等于r，u也不等于r+I，1≤q≤S,1≤v≤S。
Figure PCTCN2017111723-appb-000188
的第r行所有列和第r+I行所有列的元素的因子可以共用第一频域指示信息。
Figure PCTCN2017111723-appb-000189
的第u行v列元素的因子另外用第二频域指示信息。这样做，终端设备既可以节省反馈开销，又提高反馈精度。
在一个示例中，
Figure PCTCN2017111723-appb-000190
为如下表示之一：
Figure PCTCN2017111723-appb-000191
为
Figure PCTCN2017111723-appb-000192
的一个乘积因子；
Figure PCTCN2017111723-appb-000193
为
Figure PCTCN2017111723-appb-000194
的一个乘积因子的实部；
Figure PCTCN2017111723-appb-000195
为
Figure PCTCN2017111723-appb-000196
的一个乘积因子的虚部；
Figure PCTCN2017111723-appb-000197
为
Figure PCTCN2017111723-appb-000198
的幅度；
Figure PCTCN2017111723-appb-000199
为
Figure PCTCN2017111723-appb-000200
的相位；
Figure PCTCN2017111723-appb-000201
为
Figure PCTCN2017111723-appb-000202
的一个乘积因子的幅度；和
Figure PCTCN2017111723-appb-000203
为
Figure PCTCN2017111723-appb-000204
的一个乘积因子的相位。
在一个示例中，当i＝r,j＝s时，所述T个第一元素为
Figure PCTCN2017111723-appb-000205
在一个示例中，i＝p＝r+I,j＝q，所述T个第二元素为
Figure PCTCN2017111723-appb-000206
在一个示例中，i＝r,j＝t，且t不等于s，所述T个第四元素为
Figure PCTCN2017111723-appb-000207
在一个示例中，
Figure PCTCN2017111723-appb-000208
满足
Figure PCTCN2017111723-appb-000209
其中，
Figure PCTCN2017111723-appb-000210
表示宽带幅度，
Figure PCTCN2017111723-appb-000211
为非负实数，
Figure PCTCN2017111723-appb-000212
表示子带幅度，
Figure PCTCN2017111723-appb-000213
为非负实数，
Figure PCTCN2017111723-appb-000214
表示相位，
Figure PCTCN2017111723-appb-000215
为模为1的复数。
可选的，
Figure PCTCN2017111723-appb-000216
为如下表示之一：
Figure PCTCN2017111723-appb-000217
为
Figure PCTCN2017111723-appb-000218
Figure PCTCN2017111723-appb-000219
为
Figure PCTCN2017111723-appb-000220
Figure PCTCN2017111723-appb-000221
为
Figure PCTCN2017111723-appb-000222
Figure PCTCN2017111723-appb-000223
为
Figure PCTCN2017111723-appb-000224
的实部；
Figure PCTCN2017111723-appb-000225
为
Figure PCTCN2017111723-appb-000226
的虚部；
Figure PCTCN2017111723-appb-000227
为
Figure PCTCN2017111723-appb-000228
Figure PCTCN2017111723-appb-000229
为
Figure PCTCN2017111723-appb-000230
的实部；
Figure PCTCN2017111723-appb-000231
为
Figure PCTCN2017111723-appb-000232
的虚部；
Figure PCTCN2017111723-appb-000233
为
Figure PCTCN2017111723-appb-000234
Figure PCTCN2017111723-appb-000235
为
Figure PCTCN2017111723-appb-000236
的实部；和
Figure PCTCN2017111723-appb-000237
为
Figure PCTCN2017111723-appb-000238
的虚部。
在一个示例中，为了指示从N个子带中选出M个子带，并指示了M个频域子带在N个子带中的的位置(编号)，第一频域指示信息可以表示为i,且
Figure PCTCN2017111723-appb-000239
当子带0的第一预编码指示信息肯定会上报的时候，第一频域指示信息不需要指示子带0，则N＝T-1，此时，n(m)表示选择出的M个频域子带位置中的第m个子带的位置索引减去1,n(m)∈{0,1,…,T-2}；当子带0和子带T-1的第一预编码指示信息肯定会上报的时候,终端设备不需要反馈子带0和子带T-1的位置，则N＝T-2。此时，n(m)表示选择出的M个频域子带位置中的第m个子带的位置索引减去1,n(m)∈{0,1,…,T-3}；其他情况下，N＝T，n(m)表示选择出的M个频域子带位置中的第m个子带的位置索引,n(m)∈{0,1,…,T-1}。
Figure PCTCN2017111723-appb-000240
当频域指示信息是第一指示信息时，M＝L1；当频域指示信息是第二指示信息时，M＝L2。
上述实施例以
Figure PCTCN2017111723-appb-000241
的第r行第s列的元素
Figure PCTCN2017111723-appb-000242
的因子为相位因子
Figure PCTCN2017111723-appb-000243
为例作为描述。
Figure PCTCN2017111723-appb-000244
的第r行第s列的元素
Figure PCTCN2017111723-appb-000245
的因子也可以为
Figure PCTCN2017111723-appb-000246
的第r行第s列的元素
Figure PCTCN2017111723-appb-000247
的因子也可以是
Figure PCTCN2017111723-appb-000248
和
Figure PCTCN2017111723-appb-000249
的两两乘积。
Figure PCTCN2017111723-appb-000250
的第r行第s列的元素
Figure PCTCN2017111723-appb-000251
的因子也可以是
Figure PCTCN2017111723-appb-000252
等等。其他因子的实现方式和上述因子为
Figure PCTCN2017111723-appb-000253
的实施例类似，不再赘述。。
在一个示例中，终端设备获得所述T个频域子带的信道质量指示(channel quality indicator,CQI)。而所述T个子带的CQI是以所述T个频域子带上的所述T个预编码矩阵为条件获得的。即终端设备假设基站在T个子带的每个子带上采用这个子带所对应的预编码矩阵对下行数据进行预编码，终端设备根据此假设推导出CQI。终端设备向接入网设备发送所述T个频域子带的CQI。可选的，为了减少终端设备反馈CQI的开销。终端设备也可以上报T个频域子带的CQI的一部分。
例如，终端设备生成第四频域指示信息和M3个CQI，其中，所述T个CQI与T个频域子带的一一对应，所述第四频域指示信息用于指示T个频域子带中的L3个频域子带，1≤L3<T，所述第四频域指示信息和所述M3个CQI用于确定所述T个CQI，1<M3<T。
终端设备发送所述第四频域指示信息和所述M3个CQI。
接入网设备收到终端设备发送的M3个CQI后，通过插值的方式得到全部T个频域子带的CQI。
步骤502的终端设备的发送动作可以由收发器器301来实现。当图4中的通信装 置是终端设备，或终端设备的芯片时，本步骤终端设备的发送也可以由收发单元401实现。
相应的，接入网设备的接收动作可以由收发器301来实现。当图4中的通信装置是接入网设备，或终端设备的芯片时，接入网设备的接收动作也可以由收发单元401实现。
图8给出了终端设备发送CQI方法的示意图。
步骤801：终端设备生成第四频域指示信息和M3个CQI。所述T个CQI与T个频域子带的一一对应，所述第四频域指示信息用于指示T个频域子带中的L3个频域子带，L3<T，所述第四频域指示信息和所述M3个CQI用于确定所述T个CQI，1<M3<T。
本步骤的可以由处理器300来实现。当图4中的通信装置是终端设备，或终端设备的芯片，本步骤也可以由处理单元402实现。
本步骤的可以由处理器300来实现。当图4中的通信装置是终端设备，或终端设备的芯片，本步骤也可以由处理单元402实现。
步骤802：终端设备发送所述第四频域指示信息和所述M3个CQI。本步骤的终端设备的发送动作可以由收发器器301来实现。当图4中的通信装置是终端设备，终端设备的芯片时，本步骤终端设备的发送也可以由收发单元401实现。
对于接入网设备，接入网设备接收所述第四频域指示信息和所述M3个CQI。接入网设备根据所述第四频域指示信息确定L3个频域子带。接入网设备根据所述第四频域指示信息和所述M3个CQI获得所述T个频域子带的T个CQI。接入网设备根据第四频域指示信息和M3个CQI获得所述T个频域子带的T个CQI的方法可以参照接入网设备根据第一频域指示信息个第一预编码指示信息确定T个第一元素的方法，不再赘述。
当接入网设备和终端设备通过MIMO进行数据传输时，图8的实施例可以和图5的实施例相结合。
当接入网设备和终端设备不通过MIMO进行数据传输时，图8的实施例也可以单独实现。
上述各信道状态信息反馈方法的实施例中，终端设备不需要反馈所有T个子带的信道状态信息，减少反馈开销，提高了***资源利用率。
在本申请实施例中，第一频域指示信息、M1个第一预编码指示信息、M2个第二预编码指示信息、第二频域指示信息、M2个第三预编码指示信息、M1个第四预编码指示信息、第四频域指示信息、M3个CQI可以在一个时间单元内由终端设备发送；也可以在在不同时间单元内由终端设备发送。在此不作限定。当上述信息不在一个时间单元发送时，它们发送的顺序也不作限定。一个时间单元可以是一个子帧、一个时隙，一个或多个时域符号等等。例如，一个时域符号是正交频分复用(orthogonal frequency division multiplexing，OFDM)符号。
本申请还提供了一种计算机存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述方法实施例中的终端设备所执行的方法。
本申请还提供了一种计算机存储介质，该计算机可读存储介质中存储有指令，当 其在计算机上运行时，使得计算机执行上述方法实施例中的接入网设备所执行的方法。
本申请实施例还提供一种计算机程序产品，其包含指令，当所述计算机程序被计算机所执行时，该指令使得计算机执行上述方法中终端设备所执行的功能。
本申请实施例还提供一种计算机程序产品，其包含指令，当所述计算机程序被计算机所执行时，该指令使得计算机执行上述方法中接入网设备所执行的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘Solid State Disk(SSD))等。
应理解，在本发明实施例的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
以上所述，仅为本发明实施例的具体实施方式，但本发明实施例的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明实施例的保护范围之内。

Claims (25)

  1. 一种信道状态信息的反馈方法，其特征在于，包括：
    生成第一频域指示信息和M1个第一预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
    Figure PCTCN2017111723-appb-100001
    W1为Nt行R列的矩阵，
    Figure PCTCN2017111723-appb-100002
    为R行S列的矩阵；
    所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为
    Figure PCTCN2017111723-appb-100003
    中第r行第s列元素的因子,1<M1<T；
    发送所述第一频域指示信息和所述M1个第一预编码指示信息。
  2. 根据权利要求1所述的方法，其特征在于，还包括：
    生成M1个第二预编码指示信息；
    所述第一频域指示信息和所述M1个第二预编码指示信息用于确定T个第二元素，所述T个第二元素中的第k个第二元素为
    Figure PCTCN2017111723-appb-100004
    中第p行第q列的元素的因子,R＝2I,1≤r≤I,I为正整数,p＝r+I；
    发送所述M1个第二预编码指示信息。
  3. 根据权利要求1所述的方法，其特征在于，还包括：
    生成第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，L2<T；
    所述第二频域指示信息和所述M2个第三预编码指示信息用于确定T个第三元素，所述T个第三元素中的第k个第三元素为
    Figure PCTCN2017111723-appb-100005
    中第u行第v列的元素的因子,1<M2<T,其中，u不等于r或者v不等于s；
    发送所述第二频域指示信息和所述M2个第三预编码指示信息。
  4. 根据权利要求1所述的方法，其特征在于，还包括：
    生成M1个第四预编码指示信息，其中，S≥2,所述第一频域指示信息和所述M1个第四预编码指示信息用于确定T个第四元素，所述T个第四元素中的第k个第四元素为
    Figure PCTCN2017111723-appb-100006
    中第r行第t列的元素的因子,t不等于s；
    发送所述M1个第四预编码指示信息。
  5. 根据权利要求1-4任意一项所述的方法，其特征在于，还包括：
    确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
    确定与所述M1个频域子带一一对应的M1个第一元素，所述T个第一元素包括所述M1个第一元素，
    所述生成第一频域指示信息，包括：
    根据所述L1个频域子带生成所述第一频域指示信息；
    根据所述M1个频域子带和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
  6. 一种信道状态信息的接收方法，其特征在于，包括：
    接收第一频域指示信息和M1个预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
    Figure PCTCN2017111723-appb-100007
    W1为Nt行R列的矩阵，
    Figure PCTCN2017111723-appb-100008
    为R行S列的矩阵；
    根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素，所述T个第一元素中的第k个第一元素为
    Figure PCTCN2017111723-appb-100009
    中第r行第s列的元素的因子,1<M1<T。
  7. 根据权利要求6所述的方法，其特征在于，还包括：
    接收M1个第二预编码指示信息；
    根据所述第一频域指示信息和所述M1个第二预编码指示信息确定T个第二元素，所述T个第二元素中的第k个第二元素为
    Figure PCTCN2017111723-appb-100010
    中第p行第q列的元素的因子,R＝2I,1≤r≤I，I为正整数,p＝r+I。
  8. 根据权利要求6所述的方法，其特征在于，还包括：
    接收第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
    根据所述第二频域指示信息和所述M2个第三预编码指示信息确定T个第三元素，所述T个第三元素中的第k个第三元素为
    Figure PCTCN2017111723-appb-100011
    中第u行第v列的元素的因子,1<M2<T,其中，u不等于r或者v不等于s。
  9. 根据权利要求6所述的方法，其特征在于，还包括：
    接收M1个第四预编码指示信息；
    根据所述第一频域指示信息和所述M1个第四预编码指示信息确定T个第四元素，其中，S≥2,所述T个第四元素中的第k个第四元素为
    Figure PCTCN2017111723-appb-100012
    中第r行第t列的元素的因子,t不等于s。
  10. 根据权利要求6-9任意一项所述的方法，其特征在于，所述根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素，包括：
    根据所述第一频域指示信息,确定所述T个频域子带中的M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
    根据所述M1个第一预编码指示信息确定所述T个第一元素中的M1个第一元素，所述M1个频域子带与所述M1个第一元素一一对应；
    根据所述第一频域指示信息和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
  11. 一种通信装置，其特征在于，包括：
    处理单元，用于生成第一频域指示信息和M1个第一预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，1≤L1<T，所述T个频域子带与T个预编码矩阵一 一对应，对应于第k个频域子带的预编码矩阵Wk满足:
    Figure PCTCN2017111723-appb-100013
    W1为Nt行R列的矩阵，
    Figure PCTCN2017111723-appb-100014
    为R行S列的矩阵，
    所述第一频域指示信息和所述M1个第一预编码指示信息用于确定T个第一元素，所述T个第一元素中的第k个第一元素为
    Figure PCTCN2017111723-appb-100015
    中第r行第s列元素的因子,1<M1<T；
    收发单元，用于发送所述第一频域指示信息和所述M1个第一预编码指示信息。
  12. 根据权利要求11所述的通信装置，其特征在于，所述处理单元，还用于生成M1个第二预编码指示信息，所述第一频域指示信息和所述M1个第二预编码指示信息用于确定T个第二元素，所述T个第二元素中的第k个第二元素为
    Figure PCTCN2017111723-appb-100016
    中第p行第q列的元素的因子,R＝2I,I为正整数,1≤r≤I，p＝r+I；
    所述收发单元，还用于发送所述M1个第二预编码指示信息。
  13. 根据权利要求11所述的通信装置，其特征在于，所述处理单元，还用于生成第二频域指示信息和M2个第三预编码指示信息，其中，所述第二频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
    所述第二频域指示信息和所述M2个第三预编码指示信息用于确定T个第三元素，所述T个第三元素中的第k个第三元素为
    Figure PCTCN2017111723-appb-100017
    中第u行第v列的元素的因子,1<M2<T,其中u不等于r或者v不等于s；
    所述收发单元，还用于发送所述第二频域指示信息和所述M2个第三预编码指示信息。
  14. 根据权利要求11所述的通信装置，其特征在于，所述处理单元，还用于生成M1个第四预编码指示信息，其中，S≥2,所述第一频域指示信息和所述M1个第四预编码指示信息用于确定T个第四元素，所述T个第四元素中的第k个第四元素为
    Figure PCTCN2017111723-appb-100018
    中第r行第t列的元素的因子,t不等于s；
    所述收发单元，还用于发送所述M1个第四预编码指示信息。
  15. 根据权利要求11所述的通信装置，其特征在于，所述处理单元，还用于确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
    所述处理单元，还用于确定与所述M1个频域子带一一对应的M1个第一元素，所述T个第一元素包括所述M1个第一元素；
    所述处理单元，用于根据所述L1个频域子带生成所述第一频域指示信息；
    所述处理单元，还用于根据所述M1个频域子带和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
  16. 一种通信装置，其特征在于，包括：
    收发单元，用于接收第一频域指示信息和M1个预编码指示信息，其中，所述第一频域指示信息用于指示T个频域子带中的L1个频域子带，所述T个频域子带是***带宽或是所述***带宽的一部分，L1<T，所述T个频域子带与T个预编码矩阵一一对应，对应于第k个频域子带的预编码矩阵Wk满足:
    Figure PCTCN2017111723-appb-100019
    W1为Nt行R列的矩阵，
    Figure PCTCN2017111723-appb-100020
    为R行S列的矩阵；
    处理单元，用于根据所述第一频域指示信息和所述M1个第一预编码指示信息确定T个第一元素，所述T个第一元素中的第k个第一元素为
    Figure PCTCN2017111723-appb-100021
    中第r行第s列的元素的因子,1<M1<T。
  17. 根据权利要求16所述的通信装置，其特征在于，所述收发单元，还用于接收M1个第二预编码指示信息；
    所述处理单元，还用于根据所述第一频域指示信息和所述M1个第二预编码指示信息确定T个第二元素，所述T个第二元素中的第k个元第二素为
    Figure PCTCN2017111723-appb-100022
    中第p行第q列的元素的因子,R＝2I,I为正整数,1≤r≤I，p＝r+I。
  18. 根据权利要求16所述的通信装置，其特征在于，所述收发单元，还用于接收第二频域指示信息和M2个第三预编码指示信息，其中，所述第三频域指示信息用于指示所述T个频域子带中的L2个频域子带，1≤L2<T；
    所述处理单元，还用于根据所述第二频域指示信息和所述M2个第三预编码指示信息确定T个第三元素，所述T个第三元素中的第k个第三元素为
    Figure PCTCN2017111723-appb-100023
    中第u行第v列的元素的因子,1<M2<T,其中u不等于r或者v不等于s。
  19. 根据权利要求16所述的通信装置，其特征在于，所述收发单元，还用于接收M1个第四预编码指示信息；
    所述处理单元，还用于根据所述第一频域指示信息和所述M1个第四预编码指示信息确定T个第四元素，其中，S≥2,所述T个第四元素中的第k个第四元素为
    Figure PCTCN2017111723-appb-100024
    中第r行第t列的元素的因子,t不等于s。
  20. 根据权利要求16-19任意一项所述的通信装置，其特征在于，所述处理单元，用于根据所述第一频域指示信息,确定所述T个频域子带中M1个频域子带，所述M1个频域子带包括所述L1个频域子带，L1≤M1；
    所述处理单元，用于根据所述M1个第一预编码指示信息确定所述T个第一元素中的M1个第一元素，所述M1个频域子带与所述M1个第一元素一一对应；
    所述处理单元，用于根据所述第一频域指示信息和所述M1个第一元素，采用插值方式确定所述T个第一元素中除所述M1个第一元素之外的T-M1个第一元素。
  21. 根据权利要求1-10任意一项所述的方法，或11-20任意一项所述的通信装置，其特征在于，
    Figure PCTCN2017111723-appb-100025
    Nt为偶数，X1为
    Figure PCTCN2017111723-appb-100026
    行I列的矩阵，X1＝[b1 b2 … bI]，其中，向量bd为包含
    Figure PCTCN2017111723-appb-100027
    个元素的列向量，1≤d≤I，I为大于或等于1的正整数，Nt为偶数，
    Figure PCTCN2017111723-appb-100028
    为2I行S列的矩阵，
    Figure PCTCN2017111723-appb-100029
    为
    Figure PCTCN2017111723-appb-100030
    中的第i行第j列的元素。
  22. 根据权利要求21所述的方法或通信装置，其特征在于，i＝r,j＝s，所述T个第一元素为
    Figure PCTCN2017111723-appb-100031
    Figure PCTCN2017111723-appb-100032
    为如下表示之一：
    Figure PCTCN2017111723-appb-100033
    为
    Figure PCTCN2017111723-appb-100034
    的一个乘积因子；
    Figure PCTCN2017111723-appb-100035
    为
    Figure PCTCN2017111723-appb-100036
    的一个乘积因子的实部；
    Figure PCTCN2017111723-appb-100037
    为
    Figure PCTCN2017111723-appb-100038
    的一个乘积因子的虚部；
    Figure PCTCN2017111723-appb-100039
    为
    Figure PCTCN2017111723-appb-100040
    的幅度；
    Figure PCTCN2017111723-appb-100041
    为
    Figure PCTCN2017111723-appb-100042
    的相位；
    Figure PCTCN2017111723-appb-100043
    为
    Figure PCTCN2017111723-appb-100044
    的一个乘积因子的幅度；和
    Figure PCTCN2017111723-appb-100045
    为
    Figure PCTCN2017111723-appb-100046
    的一个乘积因子的相位。
  23. 根据权利要求21或22所述的方法或通信装置，其特征在于，
    Figure PCTCN2017111723-appb-100047
    满足
    Figure PCTCN2017111723-appb-100048
    其中，
    Figure PCTCN2017111723-appb-100049
    表示宽带幅度，
    Figure PCTCN2017111723-appb-100050
    为非负实数，
    Figure PCTCN2017111723-appb-100051
    表示子带幅度，
    Figure PCTCN2017111723-appb-100052
    为非负实数，
    Figure PCTCN2017111723-appb-100053
    表示相位，
    Figure PCTCN2017111723-appb-100054
    为模为1的复数。
  24. 根据权利要求23所述的方法或通信装置，其特征在于，i＝r,j＝s,所述T个第一元素为
    Figure PCTCN2017111723-appb-100055
    Figure PCTCN2017111723-appb-100056
    为如下表示之一：
    Figure PCTCN2017111723-appb-100057
    为
    Figure PCTCN2017111723-appb-100058
    Figure PCTCN2017111723-appb-100059
    为
    Figure PCTCN2017111723-appb-100060
    Figure PCTCN2017111723-appb-100061
    为
    Figure PCTCN2017111723-appb-100062
    Figure PCTCN2017111723-appb-100063
    为
    Figure PCTCN2017111723-appb-100064
    的实部；
    Figure PCTCN2017111723-appb-100065
    为
    Figure PCTCN2017111723-appb-100066
    的虚部；
    Figure PCTCN2017111723-appb-100067
    为
    Figure PCTCN2017111723-appb-100068
    Figure PCTCN2017111723-appb-100069
    为
    Figure PCTCN2017111723-appb-100070
    的实部；
    Figure PCTCN2017111723-appb-100071
    为
    Figure PCTCN2017111723-appb-100072
    的虚部；
    Figure PCTCN2017111723-appb-100073
    为
    Figure PCTCN2017111723-appb-100074
    Figure PCTCN2017111723-appb-100075
    为
    Figure PCTCN2017111723-appb-100076
    的实部；和
    Figure PCTCN2017111723-appb-100077
    为
    Figure PCTCN2017111723-appb-100078
    的虚部。
  25. 一种包含指令的计算存储介质，当其在计算机上运行时，使得计算机执行所述权利要求1-10，或21至24中任一项所述的方法。
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