Wireless communication method and terminal device

Abstract

A wireless communication method and terminal device, the method comprising: the terminal device determines channel state information CSI parameters, the CSI parameters comprising at least one of the following: the number N3 of frequency domain discrete Fourier transform DFT vectors, the ratio R of the channel quality indication CQI subband size and the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weighted coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device; the terminal device determines the CSI to be reported to a network device based on the CSI parameters, the CSI comprising at least one of the following: the strongest coefficient indication SCI, the spatial SD indication and the frequency domain FD indication.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and specifically to a method and terminal device for wireless communications. Background Art

[0002] In Release (Rel) 16, the New Radio (NR) type II codebook can be expressed as Wherein, W1 indicates 2L spatial beams, Indicates M frequency domain Discrete Fourier Transformation (DFT) basis vectors, (2L*M) indicates the weighting coefficients of any spatial beam, frequency domain DFT vector pair.

[0003] The channel state information (CSI) reported by the terminal device to the network device may carry L beams of W1. The M frequency domain DFT basis vectors indicated by The M frequency-domain DFT basis vectors are selected from N3 frequency-domain DFT vectors.

[0004] For the R16 Type II codebook, conversion from the frequency domain to the transform domain is required. In this case, how to report CSI is an urgent problem to be solved. Summary of the invention

[0005] The embodiments of the present application provide a method and terminal device for wireless communication, which can implement CSI reporting when converting from the frequency domain to the transform domain.

[0006] In a first aspect, a method for wireless communication is provided, wherein a terminal device determines channel state information CSI parameters, wherein the CSI parameters include at least one of the following: the number N3 of discrete Fourier transform DFT vectors in the frequency domain, the ratio R of the channel quality indication CQI subband size and the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weighted coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device; the terminal device determines the CSI to be reported to a network device based on the CSI parameters, wherein the CSI includes at least one of the following: the strongest coefficient indication SCI, the spatial domain SD indication, and the frequency domain FD indication.

[0007] In a second aspect, a terminal device is provided, which is used to execute the method in the first aspect or any possible implementation of the first aspect. Specifically, the terminal device includes a unit for executing the method in the first aspect or any possible implementation of the first aspect.

[0008] In a third aspect, a terminal device is provided, the terminal device comprising: a processor and a memory. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect or its implementation manners.

[0009] In a fourth aspect, a chip is provided for implementing the method in the first aspect or its various implementations.

[0010] Specifically, the chip includes: a processor, which is used to call and run a computer program from a memory, so that a device equipped with the chip executes the method in the above-mentioned first aspect or its various implementation modes.

[0011] In a fifth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in the above-mentioned first aspect or its various implementations.

[0012] In a sixth aspect, a computer program product is provided, comprising computer program instructions, which enable a computer to execute the method in the above-mentioned first aspect or its various implementations.

[0013] In a seventh aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method in the first aspect or its various implementations.

[0014] Based on the above technical solution, the terminal device can determine the CSI parameters, and further determine the CSI information according to the CSI parameters, so that the CSI information can be reported to the network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of an application scenario provided by an embodiment of the present application.

[0016] Figure 2 It is a schematic diagram of selecting frequency domain DFT basis vectors according to an embodiment of the present application.

[0017] Figure 3 It is a schematic diagram of a wireless communication method provided in an embodiment of the present application.

[0018] Figure 4 It is a schematic diagram of an example of the correspondence between the frequency domain DFT vector and the PMI subband.

[0019] Figure 5 It is another schematic diagram of the correspondence between the frequency domain DFT vector and the PMI subband.

[0020] Figure 6 It is another schematic diagram of the correspondence between the frequency domain DFT vector and the PMI subband.

[0021] Figure 7 It is another schematic diagram of the correspondence between the frequency domain DFT vector and the PMI subband.

[0022] Figure 8 It is another schematic diagram of the correspondence between the frequency domain DFT vector and the PMI subband.

[0023] Fig. 9 It is another schematic diagram of the correspondence between the frequency domain DFT vector and the PMI subband.

[0024] Fig.10 It is a schematic block diagram of a terminal device provided in an embodiment of the present application.

[0025] Fig.11 It is a schematic block diagram of a communication device provided in another embodiment of the present application.

[0026] Fig.12 It is a schematic block diagram of a chip provided in an embodiment of the present application. DETAILED DESCRIPTION

[0027] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0028] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system or 5G system, etc.

[0029] For example, the communication system 100 used in the embodiment of the present application is as follows: Figure 1 As shown. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or referred to as a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographical area, and may communicate with terminal devices located in the coverage area. Optionally, the network device 110 may be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device may be a mobile switching center, a relay station, an access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a network-side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

[0030] The communication system 100 also includes at least one terminal device 120 located within the coverage of the network device 110. As used herein, "terminal device" includes but is not limited to connection via a wired line, such as via a Public Switched Telephone Networks (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as, for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a DVB-H network, a satellite network, an AM-FM broadcast transmitter; and / or a device of another terminal device configured to receive / send communication signals; and / or an Internet of Things (IoT) device. A terminal device configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications System (PCS) terminals that may combine cellular radiotelephones with data processing, fax, and data communications capabilities; PDAs that may include radiotelephones, pagers, Internet / Intranet access, Web browsers, notepads, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers. A terminal device may refer to an access terminal, user equipment (UE), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal can be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved PLMN, etc.

[0031] Optionally, terminal devices 120 may perform device-to-device (D2D) communication with each other.

[0032] Optionally, the 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

[0033] Figure 1 One network device and two terminal devices are shown exemplarily. Optionally, the communication system 100 may include multiple network devices and each network device may include another number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0034] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiments of the present application.

[0035] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be referred to as a communication device. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a mobile management entity and other network entities, which is not limited in the embodiments of the present application.

[0036] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] For each layer of the multi-layer codebook, the NR type II codebook is independently encoded in the frequency domain (each subband). Due to the high spatial quantization accuracy, the total feedback amount may be too large. By feeding back the frequency domain-spatial joint codebook, the feedback amount can be greatly saved while ensuring the NR performance. Specifically, the R16 NR type II codebook can be expressed as formula (1):

[0038]

[0039] Among them, W1 can be used to indicate 2L spatial beams; Can be used to indicate M frequency domain DFT basis vectors (Frequency Basis); (A 2L*M matrix) can be used to indicate the weighting coefficients of any spatial beam and frequency domain DFT basis vector pair.

[0040] The CSI reported by the terminal device may include L beams indicated by W1, The indicated M frequency domain DFT basis vectors and the quantized After receiving the CSI, the network device can obtain the downlink CSI of each layer by the product of the three.

[0041] Among them, for The main parameters involved in the report may include:

[0042] a. L value, i.e., the number of spatial dimensions (SD) DFT basis vectors (Spatial Basis), wherein the L value may be configured by the network device to the terminal device, for example, the network device may send a radio resource control (Radio Resource Control, RRC) signaling to the terminal device, the RRC signaling indicating the L value, so that the terminal device may obtain the L value based on the RRC signaling;

[0043] b. M value (related to the reported frequency domain bandwidth), i.e., the number of frequency domain (Frequency Dimensions, FD) DFT basis vectors (or FD basis) selected by the terminal device for reporting;

[0044] c. K0 value, used to constrain The maximum number of non-zero coefficients of the reported element. Optionally, K0 = β·2LM;

[0045] d. Nsb, the number of subbands reported by CSI;

[0046] e, R, the value is 1 or 2, indicating the ratio of the subband size of the channel quality indicator (CQI) to the subband size of the precoding matrix indicator (PMI);

[0047] f, N3, the number of frequency domain DFT basis vectors (FD Basis), optionally, N3 = Nsb*R;

[0048] g, β, are used to determine the maximum number of non-zero coefficients K0;

[0049] h. Determined by a bitmap and / or an indication The number of non-zero elements in and / or Position in

[0050] i. Determined by one or more sets of (amplitude, phase) parameters The quantization accuracy in, for example, the amplitude can be quantized by 3 / 4 bit, and the phase can also be quantized by 3 / 4 bit. For another example, for a part of elements with larger energy (such as the first 50%), the amplitude is quantized by 4 bits, and the phase is quantized by 3 bits; while the smaller part of the amplitude can be quantized by 2 bits, and the phase is quantized by 2 bits; or, for the weighting coefficients corresponding to the 0th frequency domain basis vector, the amplitude and phase are both quantized by 4 bits, and for the weighting coefficients corresponding to other frequency domain basis vectors, the amplitude and phase are both quantized by 3 bits.

[0051] Among them, the M value is The number of columns, M frequency domain DFT basis vectors can be selected by the terminal device from the N3 columns of DFT vectors. Figure 2 As shown, N3=13, and the terminal device selects [0 4 9] from the 13 columns of DFT vectors, that is, M=3.

[0052] The terminal device may indicate the M DFT vectors selected by the terminal device through an FD indicator; indicate the selected L spatial domain DFT basis vectors through an SD indicator; and indicate the strongest coefficient through a strongest coefficient indicator (SCI).

[0053] The size of the CQI subband can be configured by higher layers, as shown in the following table:

[0054] Bandwidth Part (PRBs) Subband size (PRBs) <24 N / A 24～72 4，8 73～144 8，16 145～275 16，32

[0055] The network device can configure the subband for the terminal device to report the CQI. Specifically, the high layer can configure it in a bitmap manner.

[0056] For the R16 Type II codebook, since there is no frequency domain concept, that is, the frequency domain relationship of the PMI subband is not defined, in this case, how to determine the subbands corresponding to the N3 frequency domain DFT basis vectors for CSI reporting is an urgent problem to be solved.

[0057] It should be understood that, unless otherwise specified, all technical and scientific terms used in the embodiments of the present application have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit the scope of this application.

[0058] Figure 3 A schematic flow chart of a wireless communication method 200 provided in an embodiment of the present application. The method 200 may be Figure 1 The terminal device in the communication system shown executes, as shown in Figure 3As shown, the method 200 may include at least part of the following:

[0059] S210, the terminal device determines a channel state information CSI parameter, where the CSI parameter includes at least one of the following: the number N3 of frequency domain discrete Fourier transform DFT vectors, the ratio R of the channel quality indication CQI subband size to the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weight coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device;

[0060] S220, the terminal device determines the CSI to be reported to the network device according to the CSI parameters, and the CSI includes at least one of the following: the strongest coefficient indication SCI, the spatial domain SD indication and the frequency domain FD indication.

[0061] It should be understood that the meaning of the above CSI parameters can be referred to the relevant description of the previous embodiment, and will not be repeated here.

[0062] It should be understood that in an embodiment of the present application, there may be multiple PMI subbands, and the network device may configure Z PMI subbands for the terminal device. The Z PMI subbands may include part or all of the multiple PMI subbands, and the Z PMI subbands may be continuous or discontinuous.

[0063] In the embodiment of the present application, if the number of configured PMI subbands is the same as the number N3 of frequency domain DFT vectors, it can be determined that the N3 frequency domain DFT vectors correspond to the N3 PMI subbands one by one. Alternatively, if the number of configured PMI subbands is different from the number of frequency domain DFT vectors, the configured PMI subbands can be mapped to the N3 frequency domain DFT vectors according to the situation of the edge PMI subbands, which is explained below in conjunction with specific embodiments.

[0064] In the embodiment of the present application, the ratio R of the CQI subband size to the PMI subband size may be 1 or 2, that is, one CQI subband size may be equal to one PMI subband size, or one CQI subband size may be equal to two PMI subband sizes.

[0065] When R=1, it can be considered that one CQI subband corresponds to one PMI subband, and when R=2, it can be considered that one CQI subband corresponds to two PMI subbands (except for edge CQI subbands).

[0066] In some embodiments, the CQI subband or PMI subband and the frequency domain DFT vector may have a corresponding relationship. For example, the corresponding relationship may be a corresponding relationship between the sequence number of the CQI subband or PMI subband and the index of the frequency domain DFT vector. Thus, the terminal device can determine which frequency domain DFT vector it corresponds to based on the sequence number of the CQI subband or PMI subband.

[0067] As an embodiment, the PMI subband corresponding to each frequency-domain DFT vector may be determined according to the frequency-domain order of the CQI subbands or PMI subbands (for example, from small to large or from large to small).

[0068] like Figure 4 As shown, there are 9 PMI subbands, corresponding to resource blocks (Source Block, SB) 0 to SB8, where the PMI subbands configured by the network device for the terminal device include SB0, SB2, SB4, SB5 and SB8, N3 = 5, that is, 5 frequency domain DFT vectors, recorded as FD0 to FD4, which can correspond to 5 frequency domain DFT vectors in the order of the PMI subband numbers from small to large. That is, SB0 corresponds to FD0, SB2 corresponds to FD1, SB4 corresponds to FD2, SB5 corresponds to FD3, and SB8 corresponds to FD4.

[0069] In other embodiments, the PMI subbands corresponding to the N3 frequency-domain DFT vectors may also be determined according to other rules. For example, the order of the PMI subbands corresponding to each frequency-domain DFT vector in the configured PMI subbands may be determined according to the formula (x+d)mod(N3), where x is the index of the frequency-domain DFT vector, mod represents the modulus, and d is a positive integer.

[0070] Assume d = 1, combined with Figure 4 In the example shown, the correspondence between the N3 frequency domain DFT vectors and the PMI subbands can be: FD0 corresponds to the second PMI subband, i.e. SB2, FD1 corresponds to the third PMI subband, i.e. SB4, FD2 corresponds to the fourth PMI subband, i.e. SB5, and FD3 corresponds to the fifth PMI subband, i.e. SB8.

[0071] It should be understood that in the embodiments of the present application, unless otherwise specified, the sequence number of the PMI subband, the sequence number of the CQI subband, and the index of the frequency domain DFT vector start counting from 0, that is, PMI subband 0 represents the first PMI subband, CQI subband 0 represents the first CQI subband, and frequency domain DFT vector 0 represents the first frequency domain DFT vector.

[0072] It should also be understood that since the PMI subbands may be discontinuous, the sequence numbers of the PMI subbands in the embodiment of the present application may be the sequential sequence numbers of the PMI subbands in the configured PMI subbands, such as Figure 4In the example shown, SB0 may correspond to PMI subband 0, ie, the first PMI subband, SB2 may correspond to PMI subband 1, ie, the second subband, and so on.

[0073] In some embodiments, N3=Nsb*R.

[0074] In other embodiments of the present application, the terminal device may also determine the number N3 of the frequency domain DFT vectors based on at least one of the number of PMI subbands, the number of CQI subbands, and the ratio R of the CQI subband size to the PMI subband size.

[0075] As an embodiment, if R is 2, the size of the edge subband is smaller than the size of two PMI subbands, and the network device configures the terminal device to report the first subband and / or the last subband, in this case, the terminal device can determine the number of frequency domain DFT vectors N3=N sb ×RX, where the N sb is the number of subbands reported in the CSI, and X is the number of subband sizes in the first subband and / or the last subband that is less than or equal to half of the configured subband size, where X is 0, 1 or 2.

[0076] It should be understood that the size of the first edge subband is determined according to the following formula: in, Indicates the bandwidth of the CQI subband, Indicates the RB number at which the bandwidth part (Bandwidth, BWP) (i) starts;

[0077] The size of the last edge subband is determined according to the following formula:

[0078] when When

[0079] when When in, Indicates the bandwidth of the CQI subband, Indicates the RB number where BWP(i) starts. Indicates the size of BWP(i).

[0080] In this embodiment, the terminal device determines that the number N3 of frequency domain DFT vectors is equal to the number N of PMI subbands. sb ×RX, further, the N3 frequency domain DFT vectors may be mapped one-to-one to the N3 PMI subbands. For example, the N3 frequency domain DFT vectors may be mapped one-to-one to the N3 PMI subbands in the order of the sequence numbers of the PMI subbands, such as Figure 5 and Figure 6 shown.

[0081] As another embodiment, if R is 2, and the network device configures the terminal device to report the first subband and / or the last subband, the terminal device can determine the number of frequency domain DFT vectors N3=N sb ×R, where N sb The number of subbands reported in the CSI.

[0082] Further, the terminal device may determine the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors according to the correspondence between the edge CQI subband and the PMI subband.

[0083] Case 1: If the CQI subbands at the edge correspond to at least two PMI subbands, it can be determined that the number Z of PMI subbands is the same as the number N3 of frequency domain DFT vectors, and the Z PMI subbands can be further mapped one by one to the N3 frequency domain DFT vectors. For example, the PMI subbands can be mapped to the N3 frequency domain DFT vectors in order from small to large, specifically, the first PMI subband corresponds to the first frequency domain DFT vector, the second PMI subband corresponds to the second frequency domain DFT vector, and so on; or, the PMI subbands can be mapped to the N3 frequency domain DFT vectors in order from large to small, specifically, the first PMI subband corresponds to the last frequency domain DFT vector, the second PMI subband corresponds to the second to last frequency domain DFT vector, and so on.

[0084] Case 2: If the first CQI subband corresponds to only one PMI subband, the terminal device may determine that starting from the second frequency domain DFT vector among the N3 frequency domain DFT vectors, each frequency domain DFT vector corresponds to one PMI subband among the Z PMI subbands. That is, the first frequency domain DFT vector does not correspond to a PMI subband.

[0085] For example, the first PMI subband of the Z PMI subbands corresponds to the second frequency domain DFT vector of the N3 frequency domain DFT vectors, and the other PMI subbands of the Z PMI subbands correspond to the last N3-2 frequency domain DFT vectors of the N3 DFT vectors in the order of the PMI subband numbers from small to large, that is, PMI subband 0 corresponds to the second frequency domain DFT vector, that is, FD1, PMI subband 1 corresponds to FD2, and so on. Figure 7 shown.

[0086] For another example, the last PMI subband among the Z PMI subbands (i.e., PMI subband Z-1) corresponds to the second frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the last N3-2 frequency domain DFT vectors among the N3 DFT vectors in descending order of the sequence number of the PMI subbands, i.e., PMI subband Z-1 corresponds to FD1, PMI subband Z-2 corresponds to FD2, and so on.

[0087] Alternatively, the Z PMI subbands may be mapped to the last N3-1 frequency domain DFT vectors among the N3 frequency domain DFT vectors in other orders. For example, the order of the PMI subbands corresponding to each frequency domain DFT vector in the configured PMI subbands may be determined according to the formula (x+d)mod(N3), where x is the index of the frequency domain DFT vector, mod represents the modulus, and d is a positive integer.

[0088] Furthermore, the terminal device may determine a sub-band PMI on a frequency domain DFT vector that has no corresponding PMI sub-band.

[0089] For example, the terminal device can determine the first subband PMI based on the last Z-1 subbands among the Z PMI subbands. For example, the PMI on the last Z-1 PMI subbands (i.e., PMI subbands 1 to Z-1) is interpolated, extrapolated, repeated, or zero-filled to obtain the first subband PMI. The other subband PMIs (including the second to Zth subband PMIs) are the PMIs on the corresponding PMI subbands. For example, the PMI on the second PMI subband can be the second subband PMI, and so on. These subband PMIs can correspond to the N3 frequency domain DFT vectors in sequence.

[0090] The terminal device can also determine the first subband CQI based on the first PMI subband (PMI subband 0) and / or the second PMI subband (PMI subband 1), and determine the last subband CQI based on the last PMI subband (PMI subband Z-1) and / or the second to last PMI subband (PMI subband Z-2).

[0091] Specifically, the terminal device may determine the first subband CQI based on the CQI on the first PMI subband and / or the second PMI subband, and determine the last subband CQI based on the CQI on the last PMI subband and / or the second to last PMI subband.

[0092] Case 3: If the last CQI subband corresponds to only one PMI subband, the terminal device may determine that starting from the second to last frequency domain DFT vector among the N3 frequency domain DFT vectors, each frequency domain DFT vector corresponds to one PMI subband among the Z PMI subbands, that is, the last frequency domain DFT vector does not correspond to a PMI subband, such as Figure 8 shown.

[0093] For example, the last PMI subband of the Z PMI subbands corresponds to the penultimate frequency domain DFT vector of the N3 frequency domain DFT vectors, and the other PMI subbands of the Z PMI subbands correspond to the first N3-2 frequency domain DFT vectors (from large to small) of the N3 DFT vectors in the order of the PMI subband numbers from large to small, that is, PMI subband Z-1 corresponds to the penultimate frequency domain DFT vector, that is, FD N3-2 , PMI subband Z-2 corresponds to the third-to-last frequency domain DFT vector, i.e., FD N3-3 , and so on.

[0094] For another example, the first PMI subband in the Z PMI subbands corresponds to the second frequency domain DFT vector in the N3 frequency domain DFT vectors, and the other PMI subbands in the Z PMI subbands correspond to the first N3-2 frequency domain DFT vectors (from large to small) in the N3 DFT vectors according to the sequence number of the PMI subbands from small to large. That is, PMI subband 0 corresponds to FD N3-2 , PMI subband 1 corresponds to FD N3-3 , and so on.

[0095] Alternatively, the Z PMI subbands may be mapped to the first N3-1 frequency domain DFT vectors among the N3 frequency domain DFT vectors in other orders. For example, the order of the PMI subbands corresponding to each frequency domain DFT vector in the configured PMI subbands may be determined according to (x+d)mod(N3), where x is the index of the frequency domain DFT vector, mod represents the modulus, and d is a positive integer.

[0096] Furthermore, the terminal device may determine a sub-band PMI on a frequency domain DFT vector that has no corresponding PMI sub-band.

[0097] For example, the terminal device can determine the last subband PMI based on the first Z-1 subbands among the Z PMI subbands, for example, by interpolating, extrapolating, repeating or zero-padding the PMIs on the first Z-1 PMI subbands (i.e., PMI subbands 1 to Z-1) to obtain the last subband PMI, and the other subband PMIs (including the first to Z-1th subband PMIs) are the PMIs on the corresponding PMI subbands, for example, the PMI on the first PMI subband is the first subband PMI, and so on. These subband PMIs can correspond to the N3 frequency domain DFT vectors in sequence.

[0098] The terminal device can also determine the first subband CQI based on the first PMI subband (PMI subband 0) and / or the second PMI subband (PMI subband 1), and determine the last subband CQI based on the last PMI subband (PMI subband Z-1) and / or the second to last PMI subband (PMI subband Z-2).

[0099] Specifically, the terminal device may determine the first subband CQI based on the CQI on the first PMI subband and / or the second PMI subband, and determine the last subband CQI based on the CQI on the last PMI subband and / or the second to last PMI subband.

[0100] Therefore, when the number of resource blocks (RBs) corresponding to the edge subband is small, the CSI feedback overhead can be reduced by redefining N3. In addition, the terminal device can also perform interpolation or extrapolation on the non-edge PMI subband to determine the edge PMI (i.e., the first subband PMI and the last subband PMI), which is conducive to improving feedback accuracy.

[0101] In other embodiments of the present application, the terminal device may also combine the edge PMI subbands to correspond to the same frequency domain DFT vector, for example, the first A PMI subbands and the last B PMI subbands are combined to correspond to the same frequency domain DFT vector, where A is a positive integer and B is a positive integer.

[0102] For example, it can be determined that the first frequency domain DFT vector corresponds to the first A PMI subbands and the last B PMI subbands, or it can be determined that the last DFT vector corresponds to the first A PMI subbands and the last B PMI subbands. Further, non-edge PMI subbands can correspond to other frequency domain DFT vectors in sequence.

[0103] like Fig. 9 As shown, the first PMI subband and the last PMI subband both correspond to FD0, the second PMI subband corresponds to FD1, and so on.

[0104] It should be understood that Figures 4 to 9 The number of RBs, the number of PMI subbands, and the number of frequency-domain DFT vectors in the example shown are merely examples, but the embodiments of the present application are not limited thereto.

[0105] In other embodiments of the present application, the terminal device may also determine not to report an FD indication or a SD indication when specific conditions are met, which is beneficial to reducing feedback overhead.

[0106] As an embodiment, if the number M of frequency domain DFT vectors selected to be reported by the terminal device is 1 or N3-1, it is determined that the CSI does not include the FD indication, that is, the FD indication is not reported;

[0107] As an embodiment, if 2L is equal to the number of antenna ports, it is determined that the CSI does not include the SD indication, that is, the SD indication is not reported.

[0108] Optionally, L is 2 or 4, and correspondingly, the number of antenna ports is 4 or 8.

[0109] In some embodiments, the network device can configure the terminal device with parameter L, where the number of antenna ports P (CSI-RS) =4, L = 2; when the number of antenna ports P (CSI-RS) =8, 12, 16, 24, L∈{2,4}; if the terminal device's capability supports L=6, then when P (CSI-RS) =32, L∈{2,4,6}; when the terminal device does not support L=6, when the number of antenna ports P (CSI-RS) =32, L∈{2,4}(necessary condition 2L<=P (CSI-RS) ).

[0110] In other embodiments of the present application, the terminal device can determine the K0 based on β*2LM and a first value, wherein the β is used to determine the maximum number of non-zero coefficients, and wherein the first value is a fixed parameter, or is preset, or is configured by a network device.

[0111] As an example, the terminal device may determine the maximum value of β*2LM and the first value as K0. In this way, the number of non-zero coefficients for Rank=1 is at least 2, and the number of non-zero coefficients for Rank2 / 3 / 4 is at least 4.

[0112] In some embodiments, the first value is 2. Figures 3 to 9 , describes in detail the method embodiment of the present application, and the following is combined with Figures 10 to 12 , the device embodiments of the present application are described in detail. It should be understood that the device embodiments and the method embodiments correspond to each other, and similar descriptions can refer to the method embodiments.

[0113] Fig.10 FIG. 4 shows a schematic block diagram of a terminal device 400 according to an embodiment of the present application. Fig.10 As shown, the terminal device 400 includes:

[0114] The determination module 410 is used to determine the channel state information CSI parameters, wherein the CSI parameters include at least one of the following: the number N3 of discrete Fourier transform DFT vectors in the frequency domain, the ratio R of the channel quality indication CQI subband size and the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weighted coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device; and based on the CSI parameters, determine the CSI to be reported to the network device, wherein the CSI includes at least one of the following: the strongest coefficient indication SCI, the spatial domain SD indication and the frequency domain FD indication.

[0115] Optionally, in some embodiments, the determining module 410 is further configured to:

[0116] The terminal device determines the PMI subbands corresponding to the N3 frequency-domain DFT vectors respectively according to the sequence number of the configured CQI subband or the sequence number of the PMI subband.

[0117] Optionally, in some embodiments, the determining module 410 is specifically configured to:

[0118] According to the configured CQI subband number or PMI subband number and the first correspondence, determine the PMI subbands corresponding to the N3 frequency domain DFT vectors respectively, wherein the first correspondence is the correspondence between the CQI subband or PMI subband and the frequency domain DFT vector.

[0119] Optionally, in some embodiments, in the first correspondence, the first frequency domain DFT vector corresponds to a first subband, and the second frequency domain DFT vector corresponds to a second subband, wherein the index of the first frequency domain DFT vector is less than the index of the second frequency domain DFT vector, the sequence number of the first subband is less than the sequence number of the second subband, the first subband is a first CQI subband, and the second subband is a second CQI subband, or the first subband is a first PMI subband and the second subband is a second PMI subband.

[0120] Optionally, in some embodiments, the determining module 410 is further configured to:

[0121] The number N3 of the frequency domain DFT vectors is determined according to at least one of the number of PMI subbands, the number of CQI subbands, and the ratio R of the CQI subband size to the PMI subband size.

[0122] Optionally, in some embodiments, the determining module 410 is specifically configured to:

[0123] If R is 2, the size of the edge subband is smaller than the size of two PMI subbands, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×RX, where the N sb is the number of subbands reported in the CSI, and X is the number of subband sizes in the first subband and / or the last subband that is less than or equal to half of the configured subband size.

[0124] Optionally, in some embodiments, the number N3 of the frequency domain DFT vectors is equal to the number Z of the PMI subbands, and the N3 frequency domain DFT vectors correspond one-to-one to the Z PMI subbands.

[0125] Optionally, in some embodiments, the determining module 410 is further configured to:

[0126] If R is 2, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×R, where N sb The number of subbands reported in the CSI.

[0127] Optionally, in some embodiments, the determining module 410 is further configured to:

[0128] According to the correspondence between the edge CQI subband and the PMI subband, the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors is determined.

[0129] Optionally, in some embodiments, the determining module 410 is specifically configured to:

[0130] If the first CQI subband corresponds to only one PMI subband, determine that the first PMI subband among the Z PMI subbands corresponds to the second frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the last N3-2 frequency domain DFT vectors among the N3 DFT vectors in sequence according to the sequence number of the PMI subbands.

[0131] Optionally, in some embodiments, the determining module 410 is further configured to:

[0132] The first subband PMI is determined according to the last Z-1 subbands among the Z PMI subbands.

[0133] Optionally, in some embodiments, the determining module 410 is further configured to:

[0134] If the last CQI subband corresponds to only one PMI subband, determine that the last PMI subband among the Z PMI subbands corresponds to the second-to-last frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the first N3-2 frequency domain DFT vectors among the N3 frequency domain DFT vectors in sequence according to the sequence number of the PMI subbands.

[0135] Optionally, in some embodiments, the determining module 410 is further configured to:

[0136] The last subband PMI is determined according to the first Z-1 subbands among the Z PMI subbands.

[0137] Optionally, in some embodiments, the first A PMI subbands and the last B PMI subbands in the Z subbands correspond to the same frequency-domain DFT vector, wherein A is a positive integer and B is a positive integer.

[0138] Optionally, in some embodiments, the determining module 410 is further configured to:

[0139] Determine a first subband CQI according to the first PMI subband and / or the second PMI subband; and / or

[0140] The last subband CQI is determined according to the last PMI subband and / or the second to last PMI subband.

[0141] Optionally, in some embodiments, the determining module 410 is further configured to:

[0142] If the number M of frequency-domain DFT vectors selected to be reported by the terminal device is 1 or N3-1, it is determined that the CSI does not include the FD indication; or

[0143] If 2L is equal to the number of antenna ports, it is determined that the CSI does not include the SD indication.

[0144] Optionally, in some embodiments, L is 2 or 4.

[0145] Optionally, in some embodiments, the determining module 410 is further configured to:

[0146] The K0 is determined according to β*2LM and a first value, wherein the β is used to determine the maximum number of non-zero coefficients, and wherein the first value is preset or configured by a network device.

[0147] Optionally, in some embodiments, the determining module 410 is specifically configured to:

[0148] The maximum value of β*2LM and the first value is determined as K0.

[0149] Optionally, in some embodiments, the first value is 2.

[0150] Optionally, in some embodiments, the above-mentioned determination module may be one or more processors.

[0151] It should be understood that the terminal device 400 according to the embodiment of the present application may correspond to the terminal device in the method embodiment of the present application, and the above and other operations and / or functions of each unit in the terminal device 400 are respectively to implement Figure 3 For the sake of brevity, the corresponding process of the terminal device in the method 200 is not repeated here.

[0152] Fig.11 It is a schematic structural diagram of a communication device 600 provided in an embodiment of the present application. Fig.11 The communication device 600 shown includes a processor 610, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0153] Alternatively, if Fig.11 As shown, the communication device 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

[0154] The memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .

[0155] Alternatively, if Fig.11 As shown, the communication device 600 may further include a transceiver 630, and the processor 610 may control the transceiver 630 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0156] The transceiver 630 may include a transmitter and a receiver. The transceiver 630 may further include an antenna, and the number of the antennas may be one or more.

[0157] Optionally, the communication device 600 may specifically be a network device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the network device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0158] Optionally, the communication device 600 may specifically be a mobile terminal / terminal device of an embodiment of the present application, and the communication device 600 may implement the corresponding processes implemented by the mobile terminal / terminal device in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0159] Fig.12 It is a schematic structural diagram of the chip of an embodiment of the present application. Fig.12 The chip 700 shown includes a processor 710, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0160] Alternatively, if Fig.12 As shown, the chip 700 may further include a memory 720. The processor 710 may call and run a computer program from the memory 720 to implement the method in the embodiment of the present application.

[0161] The memory 720 may be a separate device independent of the processor 710 , or may be integrated into the processor 710 .

[0162] Optionally, the chip 700 may further include an input interface 730. The processor 710 may control the input interface 730 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0163] Optionally, the chip 700 may further include an output interface 740. The processor 710 may control the output interface 740 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0164] Optionally, the chip can be applied to the network device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the network device in each method of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0165] Optionally, the chip can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the chip can implement the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they will not be repeated here.

[0166] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0167] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0168] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0169] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0170] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0171] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0172] Optionally, the computer-readable storage medium can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0173] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0174] Optionally, the computer program product can be applied to the network device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0175] Optionally, the computer program product can be applied to the mobile terminal / terminal device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0176] The embodiment of the present application also provides a computer program.

[0177] Optionally, the computer program can be applied to the network device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the network device in the various methods in the embodiments of the present application. For the sake of brevity, they are not described here.

[0178] Optionally, the computer program can be applied to the mobile terminal / terminal device in the embodiments of the present application. When the computer program runs on the computer, the computer executes the corresponding processes implemented by the mobile terminal / terminal device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0179] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0180] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0181] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0182] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0183] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0184] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0185] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless communication method, characterized in that: include: The terminal device determines a channel state information CSI parameter, where the CSI parameter includes at least one of the following: the number N3 of frequency domain discrete Fourier transform DFT vectors, the ratio R of the channel quality indication CQI subband size to the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weighted coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device; The terminal device determines the CSI reported to the network device according to the CSI parameter, wherein the CSI includes at least one of the following: a strongest coefficient indication SCI, a spatial domain SD indication, and a frequency domain FD indication; wherein the method further includes: The terminal device determines the PMI subbands corresponding to the N3 frequency-domain DFT vectors respectively according to the sequence number of the configured CQI subband or the sequence number of the PMI subband; wherein the terminal device determines the PMI subbands corresponding to the N3 frequency-domain DFT vectors respectively according to the sequence number of the configured CQI subband or the sequence number of the PMI subband, including: The terminal device determines the PMI subbands corresponding to the N3 frequency domain DFT vectors respectively according to the configured CQI subband number or the PMI subband number and the first corresponding relationship, wherein the first corresponding relationship is the corresponding relationship between the CQI subband and the frequency domain DFT vector or the corresponding relationship between the PMI subband and the frequency domain DFT vector.

2. The method according to claim 1, characterized in that In the first correspondence, the first frequency domain DFT vector corresponds to the first subband, and the second frequency domain DFT vector corresponds to the second subband, wherein the index of the first frequency domain DFT vector is less than the index of the second frequency domain DFT vector, the sequence number of the first subband is less than the sequence number of the second subband, the first subband is the first CQI subband, the second subband is the second CQI subband, or the first subband is the first PMI subband, and the second subband is the second PMI subband.

3. The method according to claim 1, characterized in that The terminal device determines a channel state information CSI parameter, including: The terminal device determines the number N3 of the frequency domain DFT vectors based on at least one of the number of PMI subbands, the number of CQI subbands, and the ratio R of the CQI subband size to the PMI subband size.

4. The method according to claim 3, characterized in that The terminal device determines the number N3 of the frequency domain DFT vectors according to at least one of the number of PMI subbands, the number of CQI subbands, and a ratio R of the CQI subband size to the PMI subband size, including: If R is 2, the size of the edge subband is smaller than the size of two PMI subbands, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×RX, where the N sb is the number of subbands reported in the CSI, and X is the number of subband sizes in the first subband and / or the last subband that is less than or equal to half of the configured subband size.

5. The method according to claim 3, characterized in that: The number N3 of the frequency domain DFT vectors is equal to the number Z of the PMI subbands, and the N3 frequency domain DFT vectors correspond one-to-one to the Z PMI subbands.

6. The method according to claim 3, characterized in that The terminal device determines the number N3 of the frequency domain DFT vectors according to at least one of the number of PMI subbands, the number of CQI subbands, and the ratio R of the CQI subband size to the PMI subband size, including: If R is 2, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×R, where N sb The number of subbands reported in the CSI.

7. The method according to claim 6, characterized in that The method further comprises: According to the correspondence between the edge CQI subband and the PMI subband, the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors is determined.

8. The method according to claim 7, characterized in that The determining, according to the correspondence between the edge CQI subband and the PMI subband, the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors includes: If the first CQI subband corresponds to only one PMI subband, determine that the first PMI subband among the Z PMI subbands corresponds to the second frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the last N3-2 frequency domain DFT vectors among the N3 frequency domain DFT vectors in sequence according to the sequence number of the PMI subbands.

9. The method according to claim 8, characterized in that The method further comprises: The first subband PMI is determined according to the last Z-1 subbands among the Z PMI subbands.

10. The method according to claim 7, characterized in that The determining, according to the correspondence between the edge CQI subband and the PMI subband, the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors includes: If the last CQI subband corresponds to only one PMI subband, determine that the last PMI subband among the Z PMI subbands corresponds to the second-to-last frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the first N3-2 frequency domain DFT vectors among the N3 frequency domain DFT vectors in sequence according to the sequence number of the PMI subbands.

11. The method according to claim 10, characterized in that The method further comprises: The last subband PMI is determined according to the first Z-1 subbands among the Z PMI subbands.

12. The method according to claim 7, characterized in that The first A PMI subbands and the last B PMI subbands among the Z PMI subbands correspond to the same frequency-domain DFT vector, wherein A is a positive integer and B is a positive integer.

13. The method according to any one of claims 7 to 12, characterized in that The method further comprises: Determine a first subband CQI according to the first PMI subband and / or the second PMI subband; and / or The last subband CQI is determined according to the last PMI subband and / or the second to last PMI subband.

14. The method according to any one of claims 1 to 12, characterized in that The terminal device determines the CSI according to the CSI parameter, including: If the number M of frequency-domain DFT vectors selected to be reported by the terminal device is 1 or N3-1, it is determined that the CSI does not include the FD indication; or If 2L is equal to the number of antenna ports, it is determined that the CSI does not include the SD indication.

15. The method according to claim 14, characterized in that The L is 2 or 4.

16. The method according to any one of claims 1 to 12, characterized in that The terminal device determines the channel state information CSI parameter, including: according to *2LM and the first value, determine the K0, where the Used to determine a maximum number of non-zero coefficients, wherein the first value is preset or configured by a network device.

17. The method according to claim 16, characterized in that The basis *2LM and the first value, determine the K0, including: determine *The maximum value of 2LM and the first value is the K0.

18. The method according to claim 16, characterized in that The first value is 2.

19. A terminal device, characterized in that: include: A determination module is used to determine a channel state information CSI parameter, where the CSI parameter includes at least one of the following: the number N3 of frequency domain discrete Fourier transform DFT vectors, the ratio R of the channel quality indication CQI subband size to the precoding matrix indication PMI subband size, the number K0 of the largest non-zero elements in the weighted coefficient matrix of the codebook, the number L of spatial domain DFT vectors selected to be reported by the terminal device, and the number M of frequency domain DFT vectors selected to be reported by the terminal device; and according to the CSI parameter, determine the CSI reported to the network device, where the CSI includes at least one of the following: the strongest coefficient indication SCI, the spatial domain SD indication and the frequency domain FD indication; wherein the determination module is also used to: The terminal device determines the PMI subbands corresponding to the N3 frequency-domain DFT vectors respectively according to the sequence number of the configured CQI subband or the sequence number of the PMI subband; wherein the determination module is specifically used to: According to the configured CQI subband sequence number or PMI subband sequence number and the first correspondence, determine the PMI subbands corresponding to the N3 frequency domain DFT vectors respectively, wherein the first correspondence is the correspondence between the CQI subband and the frequency domain DFT vector or the correspondence between the PMI subband and the frequency domain DFT vector.

20. The terminal device according to claim 19, characterized in that: In the first correspondence, the first frequency domain DFT vector corresponds to the first subband, and the second frequency domain DFT vector corresponds to the second subband, wherein the index of the first frequency domain DFT vector is less than the index of the second frequency domain DFT vector, the sequence number of the first subband is less than the sequence number of the second subband, the first subband is the first CQI subband, the second subband is the second CQI subband, or the first subband is the first PMI subband, and the second subband is the second PMI subband.

21. The terminal device according to claim 19, characterized in that: The determining module is also used for: The number N3 of the frequency domain DFT vectors is determined according to at least one of the number of PMI subbands, the number of CQI subbands, and a ratio R of the CQI subband size to the PMI subband size.

22. The terminal device according to claim 21, characterized in that: The determination module is specifically used for: If R is 2, the size of the edge subband is smaller than the size of two PMI subbands, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×RX, where the N sb is the number of subbands reported in the CSI, and X is the number of subband sizes in the first subband and / or the last subband that is less than or equal to half of the configured subband size.

23. The terminal device according to claim 21, characterized in that: The number N3 of the frequency domain DFT vectors is equal to the number Z of the PMI subbands, and the N3 frequency domain DFT vectors correspond one-to-one to the Z PMI subbands.

24. The terminal device according to claim 21, characterized in that: The determining module is also used for: If R is 2, and the network device configures the terminal device to report the first subband and / or the last subband, the number of frequency domain DFT vectors N3=N is determined. sb ×R, where N sb The number of subbands reported in the CSI.

25. The terminal device according to claim 24, characterized in that: The determining module is also used for: According to the correspondence between the edge CQI subband and the PMI subband, the correspondence between each PMI subband in the configured Z PMI subbands and the N3 frequency-domain DFT vectors is determined.

26. The terminal device according to claim 25, characterized in that: The determination module is specifically used for: If the first CQI subband corresponds to only one PMI subband, determine that the first PMI subband among the Z PMI subbands corresponds to the second frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the last N3-2 frequency domain DFT vectors among the N3 frequency domain DFT vectors in sequence according to the sequence number of the PMI subbands.

27. The terminal device according to claim 26, characterized in that: The determining module is also used for: The first subband PMI is determined according to the last Z-1 subbands among the Z PMI subbands.

28. The terminal device according to claim 25, characterized in that: The determining module is also used for: If the last CQI subband corresponds to only one PMI subband, determine that the last PMI subband among the Z PMI subbands corresponds to the second-to-last frequency domain DFT vector among the N3 frequency domain DFT vectors, and the other PMI subbands among the Z PMI subbands correspond to the first N3-2 frequency domain DFT vectors among the N3 frequency domain DFT vectors in sequence according to the sequence number of the PMI subbands.

29. The terminal device according to claim 28, characterized in that: The determining module is also used for: The last subband PMI is determined according to the first Z-1 subbands among the Z PMI subbands.

30. The terminal device according to claim 25, characterized in that: The first A PMI subbands and the last B PMI subbands among the Z PMI subbands correspond to the same frequency-domain DFT vector, wherein A is a positive integer and B is a positive integer.

31. The terminal device according to any one of claims 25 to 30, characterized in that: The determination module is further configured to: determine the first subband CQI according to the first PMI subband and / or the second PMI subband; and / or The last subband CQI is determined according to the last PMI subband and / or the second to last PMI subband.

32. The terminal device according to any one of claims 19 to 30, characterized in that: The determination module is also used to: if the number M of frequency domain DFT vectors selected to be reported by the terminal device is 1 or N3-1, determine that the CSI does not include the FD indication; or if 2L is equal to the number of antenna ports, determine that the CSI does not include the SD indication.

33. The terminal device according to claim 32, characterized in that: The L is 2 or 4.

34. The terminal device according to any one of claims 19 to 30, characterized in that: The determining module is also used to: *2LM and the first value, determine the K0, where the Used to determine a maximum number of non-zero coefficients, wherein the first value is preset or configured by a network device.

35. The terminal device according to claim 34, characterized in that: The determination module is specifically used for: Sure *The maximum value of 2LM and the first value is the K0.

36. The terminal device according to claim 34, characterized in that: The first value is 2.

37. A terminal device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method according to any one of claims 1 to 18.

38. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 18.

39. A computer-readable storage medium, characterized in that: Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 18.

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