Channel state information feedback method and device and storage medium

Abstract

The invention provides a channel state information feedback method and device, and a storage medium, relates to the technical field of communication, and helps to reduce the feedback overhead of channel state information. The channel state information feedback method comprises the following steps: receiving a reference signal; on the basis of the reference signal, channel state information is determined, the channel state information comprises multiple pieces of indication information, and frequency domain feedback granularities corresponding to at least two pieces of indication information in the multiple pieces of indication information are different; and transmitting the channel state information.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to a method, device, and storage medium for feedback of channel state information. Background Art

[0002] Multiple-input, multiple-output (MIMO) technology is a key physical layer technology in fourth-generation (4G) and fifth-generation (5G) wireless systems. It enables higher spatial division multiplexing and spectrum efficiency, further increasing cell capacity. Channel measurement is fundamental to MIMO applications. Existing 4G and 5G standards generally determine channel state information based on reference signal measurement and feedback.

[0003] In existing standards, a communication bandwidth can be divided into multiple subbands. For example, a continuous group of resource blocks (RBs) within a bandwidth part (BWP) activated during terminal communication can be divided into a subband. During channel measurement and feedback, the base station can configure the subbands on which channel state information needs to be fed back, and each subband feeds back corresponding indication information.

[0004] Considering that future wireless communication systems will adopt larger communication bandwidths, it is necessary to design more reasonable channel state information feedback methods to adapt to the needs of large-bandwidth MIMO wireless communications, reduce feedback overhead and improve transmission performance. Summary of the Invention

[0005] The present disclosure provides a method, device, and storage medium for channel state information feedback, which helps reduce the feedback overhead of channel state information. The technical solutions provided by the present disclosure are as follows:

[0006] In one aspect, a method for feeding back channel state information is provided, the method comprising:

[0007] receiving a reference signal;

[0008] Determining channel state information based on a reference signal, the channel state information including a plurality of indication information, the plurality of indication information including at least first precoding matrix indication information and second precoding matrix indication information; the first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set; the second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information; and at least two of the plurality of indication information correspond to different frequency domain feedback granularities.

[0009] Send channel status information.

[0010] In another aspect, a channel state information feedback device is provided, the device comprising:

[0011] A communication module, configured to receive a reference signal;

[0012] A processing module, configured to determine channel state information based on a reference signal, where the channel state information includes multiple indication information, the multiple indication information including at least first precoding matrix indication information and second precoding matrix indication information; the first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set; the second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information; and at least two of the multiple indication information correspond to different frequency domain feedback granularities.

[0013] The communication module is also used to send channel status information.

[0014] On the other hand, a communication device is provided, comprising: a memory and a processor; the memory and the processor are coupled; the memory is used to store computer program instructions executable by the processor; and the channel state information feedback method of any of the above embodiments is implemented when the processor executes the computer program instructions.

[0015] On the other hand, a computer-readable storage medium is provided, on which computer program instructions are stored. When the computer program instructions are executed on a computer (e.g., a channel state information feedback device or a signal transmission device), the channel state information feedback method of any of the above embodiments is implemented.

[0016] On the other hand, a computer program product is provided, which includes computer program instructions, and when the computer program instructions are executed, the channel state information feedback method of any one of the above embodiments is implemented.

[0017] The technical solution provided by the embodiments of the present disclosure receives a reference signal; based on the reference signal, determines channel state information (CSI). The CSI includes multiple indication information, including at least first precoding matrix indication information and second precoding matrix indication information. The first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine the position of a target codeword within the codeword set. The second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information. At least two of the multiple indication information correspond to different frequency domain feedback granularities. The frequency domain feedback granularity of the CSI indication information can be understood as a bandwidth. Within this bandwidth, the channel state can be determined using the same indication information, while outside this bandwidth, a different indication information is required. It can be understood that feedback granularity is the applicable bandwidth of an indication information. The larger the applicable bandwidth, the coarser the feedback granularity, the fewer indication information needs to be fed back within a fixed bandwidth, and the lower the feedback overhead. Because different properties of actual communication channels vary at different rates with frequency, different frequency domain feedback granularities can be configured. In this way, the frequency domain feedback granularity corresponding to different indication information is determined respectively, and the number of different indication information that need to be fed back within the communication bandwidth can be configured more reasonably. For slowly changing channel attributes, if its indication information is still configured according to the frequency domain feedback granularity of the fast changing attribute, it will lead to a waste of feedback resources. Compared with the related art in which different indication information in the channel state information uses the same frequency domain feedback granularity, the technical solution provided by the present disclosure can have different frequency domain resource granularities corresponding to different indication information in the multiple indication information included in the channel state information. In this way, the system can optimize the feedback overhead without affecting the accuracy of the channel feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure;

[0019] Figure 2 A flow chart of a method for feeding back channel state information provided by an embodiment of the present disclosure;

[0020] Figure 3 A schematic diagram of sub-band division corresponding to i2 feedback in the relevant standards provided in the embodiments of the present disclosure;

[0021] Figure 4 An embodiment of the present disclosure provides an i 21 and i 22 Schematic diagram of the configuration of the frequency domain feedback granularity of the indication information;

[0022] Figure 5 A schematic diagram of frequency domain feedback granularity configuration for a first CQI and a second CQI provided in an embodiment of the present disclosure;

[0023] Figure 6 A schematic diagram of frequency domain feedback granularity configuration for i2 and CQI provided in an embodiment of the present disclosure;

[0024] Figure 7 A flow chart of another channel state information feedback method provided by an embodiment of the present disclosure;

[0025] Figure 8 A schematic structural diagram of a channel state information feedback device provided by an embodiment of the present disclosure;

[0026] Figure 9 A schematic structural diagram of another channel state information feedback device provided by an embodiment of the present disclosure;

[0027] Figure 10 A schematic structural diagram of a communication device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0029] In the description of the present disclosure, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "a plurality" means two or more. Words such as "first" and "second" do not limit the quantity and execution order, and words such as "first" and "second" do not limit them to be necessarily different.

[0030] It should be noted that in this disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this disclosure as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0031] MIMO is a key physical layer technology in 4G and 5G mobile communications, which can achieve higher spatial division multiplexing and spectrum efficiency, and further improve cell capacity. Channel measurement is the basis for the application of MIMO technology in communication systems. The existing 4G and 5G standards generally determine channel state information based on reference signal measurement and feedback. For example, the downlink channel information can be transmitted by the base station as a pilot signal and fed back to the base station after measurement by the terminal. The fed-back channel state information generally needs to be quantized to compress the feedback overhead. For example, the precoding matrix indicator (PMI) is used to characterize the channel state. The base station configures downlink precoding for information transmission based on the PMI fed back by the terminal. In actual applications, the terminal can feedback multiple indication information based on the measured pilot signal, which may include PMI, rank indicator (RI), channel quality indicator (CQI), etc.

[0032] In relevant standards, a communication bandwidth can be divided into multiple subbands. For example, a continuous set of resource blocks (RBs) within a BWP activated during terminal communication can be divided into a subband. During the channel measurement and feedback process, the base station can configure the subbands for which channel state information feedback is required, and each subband feedbacks corresponding indication information. Whether in the 4G or 5G standards, different channel state information, such as PMI and CQI, uses the same subband division. Accordingly, during the feedback process, the number of feedbacks for different indication parameters is the same. However, in reality, different indication parameters vary at different speeds across frequency bands. For example, the beam angle caused by dispersion varies across frequency bands, and the polarization phase caused by rough surface scattering varies across frequency bands. In other words, the bandwidths to which beam indication information and polarization phase indication information can be applied can be different. For example, there is no direct correlation between the PMI, which represents the beam, and the CQI, which represents the signal-to-interference-and-noise ratio. In some cases, the impact of the CQI feedback granularity on MIMO transmission performance is far greater than that of the PMI feedback granularity. As can be seen from the above examples, if different feedback parameters use the same subband division method, it may affect MIMO transmission performance and feedback overhead. It can be understood that the subband division method corresponds to the frequency domain feedback granularity of channel state information. The narrower the subband bandwidth, the finer the frequency domain feedback granularity.

[0033] Future wireless communication systems will utilize even larger communication bandwidths. If channel state information feedback is still performed according to relevant standards, more sub-band channel state information will be required, increasing feedback overhead. Therefore, it is urgent to design more reasonable channel state information feedback methods for large-bandwidth MIMO wireless communications.

[0034] In view of this, the present disclosure proposes a channel state information feedback method by receiving a reference signal; based on the reference signal, determining the channel state information, the channel state information includes multiple indication information, and the frequency domain resource granularity corresponding to at least two of the multiple indication information is different; and sending the channel state information.

[0035] In this way, the frequency domain feedback granularity corresponding to different indication information is determined respectively, and the number of different indication information that need to be fed back within the communication bandwidth can be configured more reasonably. For slowly changing channel attributes, if its indication information is still configured according to the frequency domain feedback granularity of the fast-changing attribute, it will lead to a waste of feedback resources. Compared with the related art in which different indication information in the channel state information adopts the same frequency domain feedback granularity, the technical solution provided by the present disclosure can have different frequency domain resource granularities corresponding to different indication information in the multiple indication information included in the channel state information. In this way, the system can optimize the feedback overhead without affecting the accuracy of the channel feedback.

[0036] The channel state information feedback method provided by the embodiments of the present disclosure can be applied to systems of various communication formats. For example, the channel state information feedback method provided by the embodiments of the present disclosure can be applied to systems including, but not limited to, LTE systems, various versions based on LTE evolution, 5G systems, and other communication systems. In addition, the channel state information feedback method provided by the embodiments of the present disclosure can also be applied to future-oriented communication systems (such as 6G communication systems).

[0037] The network architecture of the mobile communication network (including but not limited to 3G, 4G, 5G and future mobile communication networks) in the embodiment of the present disclosure may include at least a first communication node and a second communication node. It should be understood that in this example, in the downlink, the first communication node may be a network side device (for example, including but not limited to a base station), and the second communication node may be a terminal side device (for example, including but not limited to a terminal). Of course, in the uplink, the first communication node may also be a terminal side device, and the second communication node may also be a network side device. In the device-to-device communication between the two communication nodes, the first communication node and the second communication node may both be a base station or a terminal. The first communication node and the second communication node may be referred to as the first node and the second node, respectively.

[0038] For example, taking the first communication node as a terminal and the second communication node as a base station, as shown in FIG. Figure 1 As shown in FIG, a communication system provided by an embodiment of the present disclosure includes a terminal 10 and a base station 20. The terminal 10 and the base station 20 may be one or more, and the number is not limited.

[0039] In some embodiments, base station 20 provides wireless access services to terminal 10. A base station 20 provides at least one service coverage area (also called a cell). Terminal 10 entering this area can communicate with base station 20 via wireless signals to receive the wireless access services provided by base station 20.

[0040] In some embodiments, the base station (BS) can be a base station or an evolved base station (eNB or eNodeB) in long term evolution (LTE), long term evolution advanced (LTEA), a base station device in a 5G network, or a base station in a future communication system, etc. The base station may include various macro base stations, micro base stations, home base stations, wireless remote stations, reconfigurable intelligent surfaces (RISs), routers, relays, TRPs, wireless fidelity (WIFI) devices and other network side devices.

[0041] In some embodiments, the terminal may be a device with wireless transceiver capabilities. The terminal may be a mobile phone, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiments of the present disclosure do not limit the application scenarios. The terminal may sometimes also be referred to as a user, user equipment (UE), access terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal, mobile device, UE terminal, wireless communication device, UE agent or UE device, etc., and the embodiments of the present disclosure do not limit this.

[0042] It should be noted that Figure 1 This is just an illustrative framework diagram. Figure 1 The number of devices included in the Figure 1In addition to the devices shown, the communication system may also include other devices, such as core network devices.

[0043] The application scenarios of the embodiments of the present disclosure are not limited. The system architecture and business scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. It is known to those skilled in the art that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present disclosure are also applicable to similar technical problems.

[0044] The embodiment of the present disclosure provides a method for feeding back channel state information, which is applied to a first node. Figure 2 As shown, the method includes the following steps:

[0045] S101: Receive a reference signal.

[0046] The reference signal may include a channel state information-reference signal (CSI-RS) and a synchronization signal (SS). The reference signal may also include other types of reference signals in addition to the aforementioned reference signals of the same type, which is not limited in this disclosure.

[0047] Exemplarily, the reception of the reference signal can be expressed as follows:

[0048] y=Hx+n

[0049] Where x is the reference signal, H is the channel matrix, n is the noise term, and y is the received vector.

[0050] In order to complete the channel estimation, the receiver can design a measurement matrix W to process the y received vector, that is:

[0051] y'=Wy

[0052] W can be designed using common methods such as minimum mean square error, linear minimum mean square error, and maximum likelihood estimation. As shown in the received reference signal representation above, the received reference signal y contains the channel H, and the measurement matrix W can be used to determine the channel H from y'.

[0053] The dimension of the channel H is related to the bandwidth and the dimensions of the transceiver array. Directly feeding back the channel matrix is ​​too expensive, so quantized feedback is generally required. Quantized feedback involves using a specific method to represent the channel state information and use it for feedback. This specific method can compress or reduce the dimensionality of the complete channel state information.

[0054] Quantized channel state information generally includes wideband and subband indications. Wideband refers to a relatively large bandwidth in wireless communications, such as a bandwidth-weighted (BWP). This bandwidth can be divided into multiple subbands, each occupying a small portion of the bandwidth within the wideband frequency band. Generally, the channel state of each subband varies, so feedback of channel state information for each subband is required. The subband channel information required for feedback can be preconfigured. The more subbands there are, the more subband channel state indication information that requires feedback, resulting in increased feedback overhead.

[0055] For example, the channel is quantized using codewords in a codebook and the PMI is used as channel state information. Each codeword can represent a channel state, and based on the PMI corresponding to the codeword, the base station can determine the MIMO precoding for information transmission.

[0056] For example, the CQI can be used to quantify the channel quality, assigning different levels of quality to the channel based on the channel measurement results. The base station can then use the CQI to determine the modulation order of the transmitted signal, such as 64-QAM or 128QAM, and the modulation code rate.

[0057] S102: Determine channel state information based on a reference signal.

[0058] The channel state information includes multiple indication information, and the multiple indication information includes at least first precoding matrix indication information (denoted as i1) and second precoding matrix indication information (denoted as i2). The first precoding matrix indication information is used to determine a codeword set from the codebook, and the second precoding matrix indication information is used to determine the position of the target codeword in the codeword set. In this way, the codewords in the preset codebook can be used as a representation of the channel state. By selecting codewords in the preset codebook to match the channel state, a suitable codeword is determined, and the PMI corresponding to the codeword is used as channel state information for feedback. The preset codebook contains a set of codewords, each codeword corresponds to a precoding matrix, and the precoding matrix can be used to configure the signal amplitude and phase of the MIMO array, so that the array transmits a directional beam and improves the signal reception power in a specific direction.

[0059] Among them, the first precoding matrix indication information and the second precoding matrix indication information have other names. For example, the first precoding matrix indication information can be called bandwidth indication information, and the second precoding matrix indication information can be called narrowband indication information. This disclosure does not limit this.

[0060] In some embodiments, i1 can be divided into the third sub-precoding matrix indication information (denoted as i 11 ) and the fourth sub-precoding matrix indication information (denoted as i 12) two parts of indication information, which are used to indicate the codeword index in the first direction and the second direction in the codeword set respectively.

[0061] As an example, according to the instruction information i 11 、i 12 The following codeword set can be determined

[0062] The above collection It consists of M1 rows and M2 columns of sub-codeword groups. An element W in l,m Represents a sub-codeword group, subscript l, m is the index of the sub-codeword group in the codebook, K1, K2, M1, M2 are preset parameters. K1, K2 are used to determine the reference sub-codeword group The offset in the codeword set, M1 and M2 are used to determine the codeword set The number of rows and columns of the neutron codeword group.

[0063] In some cases, K1 and K2 may be set to 0, in which case the reference sub-codeword group is located in the upper left corner of the above set.

[0064] In some cases, a sub-codeword group W in the above set l,m Represents a set of codewords with the same beam direction, so according to its index l,m, the beam direction of the codeword in the codeword group can be determined when it is used to configure the precoding of the MIMO array. Indicates the optional beam range of the subband during feedback.

[0065] In some embodiments, the second precoding matrix indication information includes the first sub-precoding matrix indication information (denoted as i 21 ) and the second sub-precoding matrix indication information (denoted as i 22 ).

[0066] In some embodiments, i 21 Beam index used to indicate the subband, i 22 Used to indicate the polarization phase state index of the subband.

[0067] In some embodiments, the length of i2 is determined by the number of sub-codeword groups in the codeword set and the number of polarization phase states in the sub-codeword group. For example, when the codeword set consists of sub-codeword groups with 2 rows and 2 columns, if each sub-codeword group contains 4 polarization phase states, the value of i2 ranges from 0 to 15, and i2 requires 4 bits of feedback resources. For example, Table 1 provides a mapping table of PMI indication information and codeword index. As shown in Table 1, the beam indication information occupies 2 bits of resources, and the polarization phase indication information also occupies 2 bits of resources.

[0068] Table 1

[0069]

[0070]

[0071] In some embodiments, the codewords in the codebook may be represented as follows:

[0072]

[0073] in,

[0074]

[0075]

[0076] The codeword index {l, m, n} may be determined according to the codeword indication information {i1, i2}.

[0077] In some embodiments, the range of the selectable sub-codeword group can be determined by the indication information i1, and the position of the selected codeword in the selectable sub-codeword group can be determined by the indication information i2. 11 =8,i 12＝ 6}, determine the optional sub-code word group is {W 8,6 ,W 8,7 ,W 9,6 ,W 9,7 According to the number of optional sub-codeword groups determined by i1, the number of i 21 The value range is 0 to 3. For example, when i 21 =2 indicates that the sub-code word group selected by the indication information is W 9,6 According to i 22 The value of can further determine the polarization phase state indicated by the indication information, for example, in some cases W l,m,n In the index of n=i 22 , when i 22 =1, the indication information {i 11 =8,i 12 =6,i 21 =2,i 22 =1} The determined codeword is W 9,6,1 .

[0078] In some embodiments, if the codeword set Composed of 4 rows and 4 columns of sub-codewords, each sub-codeword still contains 4 polarization phase states. The value range of i2 becomes 0 to 63, and the feedback resource occupied by i2 is now 6 bits. Therefore, during the feedback process, the larger the selectable beam range of the subband, the greater the feedback overhead. This is because related technologies use the same sub-band division for the beam indication information and polarization phase indication information in the i2 indication information.

[0079] For example, Figure 3 A schematic diagram of the sub-band division corresponding to i2 feedback in relevant standards is provided. Figure 3 As shown, a broadband wideband (BWP) is divided into four subbands. Each subband contains multiple resource blocks (RBs) or resource block groups (RB groups). Each square in the figure represents an RB or RB group. A total of four i2 indication information bits (i.e., i2-1, i2-2, i2-3, and i2-4 in the figure) are required for feedback for the four subbands. If the codeword set determined by broadband indication i1 includes four beams, and each beam contains four polarization states, the i2 feedback overhead is 16 bits.

[0080] Understandably, this approach doesn't account for the varying speeds at which different channel state information changes across frequency bands. Therefore, configuration often requires subband division based on the worst-case scenario to ensure accurate quantization and characterization of all channel state information, which increases feedback overhead. To address these shortcomings, the following describes a specific method for determining frequency-domain feedback granularity for different channel state information types, as provided in this disclosure.

[0081] In some embodiments, frequency domain feedback granularities corresponding to at least two pieces of indication information among the multiple pieces of indication information included in the channel state information are different.

[0082] The frequency domain feedback granularity corresponding to the indication information is the frequency band range of the channel state indicated by the indication information. Finer frequency domain feedback granularity indicates a smaller frequency band range for the channel state indicated by the indication information. Channels outside this frequency band range do not meet the channel state requirements and require additional indication information. The frequency domain feedback granularity configuration allows the communication band to be divided into a group of subbands, each of which occupies a bandwidth within the communication band.

[0083] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are independently configured. This independent configuration of the frequency domain feedback granularity for different sub-precoding matrix indication information enables the communication system to flexibly select the appropriate feedback granularity based on the characteristics or requirements of different sub-precoding matrices. This flexibility helps reduce the feedback overhead of channel state information while adapting to different channel conditions and transmission requirements.

[0084] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are different. That is, within a given communication bandwidth, the frequency domain feedback granularity corresponding to i 21 and i 22 The number of subbands of the indication information can be different, and accordingly, the number of i 21 and i 22 The number of indication information may also be different.

[0085] In some embodiments, i 21 The corresponding sub-bands S1 and i 22 The corresponding sub-band S2 partially overlaps.

[0086] For example, Figure 4 The present disclosure provides an i 21 and i 22 Schematic diagram of the configuration of the frequency domain feedback granularity of the indication information. Figure 4 The second precoding indication information i2 in a BWP is divided into i 21 and i 22 Two parts, one of which corresponds to i 21 A BWP can be configured as 4 subbands, each subband contains 3 RBs or RB groups, and the corresponding i 22 A BWP can be configured as two subbands, each subband contains six RBs or RB groups. In this case, the second precoding indication information i2 includes four i 21 Instructions and 2 i's 22 If the codeword set determined by the first precoding indication i1 contains 4 beams, and each beam contains 4 polarization phase states, then the feedback overhead of i2 is 12 bits, where i 21 The feedback overhead is 8 bits, i 22 The feedback overhead is 4 bits, which is much lower than the feedback method in the related art (see Figure 3 When the number of subbands that need feedback in BWP is very large, i 21 and i 22 The corresponding frequency domain feedback granularity is independently configured to effectively reduce the feedback overhead. In the above embodiment, the division of a BWP into 2 or 4 sub-bands is only for illustration, and in actual application, it can be flexibly configured according to communication requirements.

[0087] Continue to refer Figure 4 As shown, i 22 The frequency domain granularity of the feedback is i 21 The feedback granularity is coarse, that is, corresponding to i 22 The bandwidth of the subband is greater than the bandwidth corresponding to i 21In other cases, it can also be configured as i 22 The frequency domain granularity of the feedback is i 21 The feedback granularity is fine, that is, corresponding to i 22 The bandwidth of the subband is smaller than that corresponding to i 21 The bandwidth of the sub-band.

[0088] In some embodiments, i can be used within a BWP. 21 and i 22 Configured as different frequency domain feedback granularity, and in another BWP, i 21 and i 22 Configured to the same frequency domain feedback granularity.

[0089] In some embodiments, within a BWP 21 The frequency domain feedback granularity is i 22 The frequency domain feedback granularity is coarse, while in another BWP i 21 The frequency domain feedback granularity is i 22 The frequency domain feedback granularity is fine.

[0090] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information; or, the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information, where M is a positive integer greater than or equal to 1.

[0091] For example, continue to refer to Figure 4 As shown in the figure, i 22 The corresponding subband bandwidth is i 21 The corresponding subband bandwidth is twice, while in other cases, i 21 The corresponding subband bandwidth and i 22 The corresponding sub-band bandwidth may be other multiples.

[0092] In some embodiments, 21 and i 22 When different frequency domain feedback granularity is configured, the codeword determination process needs to be based on i 21 Instructions and 22 The subband positions corresponding to the indication information are combined to determine a codeword applicable to the designated subband, wherein at least a portion of the indication information can be used to determine codewords applicable to multiple subbands.

[0093] For example, continue to refer to Figure 4 As shown in the figure, the information i 21 -1 and indication information i 22 -1 determines the codeword applicable to subband 1 in the left BWP, while the indication information i21 -2 and i 22 -1 is used to determine the codeword applicable to subband 2 in the left BWP, i.e. 22 -1 can be used to determine the applicable codewords for the two subbands.

[0094] In some embodiments, the multiple indication information also includes channel quality indication information; wherein the channel quality indication information includes first channel quality indication information and second channel quality indication information, and the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are independently configured respectively.

[0095] In some embodiments, the first channel quality indication information corresponds to a layer channel, and the second channel quality indication information corresponds to another layer channel. Layer channels refer to channels corresponding to different layers when multi-layer transmission is used in MIMO communication, and different layer channels have different channel states.

[0096] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are different. Compared to related technologies, the frequency domain feedback granularity of CQI does not take into account the differences between layers. Different layers use the same frequency domain feedback granularity, which is not conducive to compressing feedback overhead. The feedback method proposed in this disclosure takes into account the different transmission requirements of different transmission layers and can configure different frequency domain feedback granularities for CQI of different layers.

[0097] For example, Figure 5 As shown, a BWP can be configured to feedback four subbands for the first CQI, denoted as CQI-11, CQI-12, CQI-13, and CQI-14, and two subbands for the second CQI, denoted as CQI-21 and CQI-22. According to relevant standards, both the first and second layer CQI feedback are configured based on four subbands, which obviously increases feedback overhead. However, the feedback method proposed in this disclosure configures the frequency domain granularity of CQI feedback for different layers separately, thus compressing feedback overhead.

[0098] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information is N times the frequency domain feedback granularity corresponding to the second channel quality indication information; or, the frequency domain feedback granularity corresponding to the second channel quality indication information is N times the frequency domain feedback granularity corresponding to the first channel quality indication information, where N is a positive integer greater than or equal to 1.

[0099] For example, continue to refer to Figure 5As shown in the figure, the subband bandwidth corresponding to CQI-2 is twice the subband bandwidth corresponding to CQI-1, while in other cases, the subband bandwidth corresponding to CQI-1 and the subband bandwidth corresponding to CQI-2 can be other multiples.

[0100] In some embodiments, the multiple indication information further includes channel quality indication information, wherein the frequency domain feedback granularity corresponding to the channel quality indication information and the frequency domain feedback granularity corresponding to the second precoding matrix indication information are independently configured.

[0101] In some embodiments, the frequency domain feedback granularity corresponding to the second precoding matrix indication information is different from the frequency domain feedback granularity corresponding to the channel quality indication information.

[0102] For example, Figure 6 As shown, one BWP can be configured as 4 subbands for CQI feedback and as 2 subbands for i2 feedback in PMI.

[0103] In some embodiments, a frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to the channel quality indication information.

[0104] In some embodiments, the channel quality indication information includes first channel quality indication information and second channel quality indication information, wherein a frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to at least one of the first channel quality indication information and the second channel quality indication information.

[0105] In some embodiments, the multiple indication information further includes channel quality indication information; wherein the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are independently configured.

[0106] In some embodiments, the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are different.

[0107] In some embodiments, there are multiple second precoding matrix indication information, and the frequency domain feedback granularities corresponding to the multiple second precoding matrix indication information are independently configured. The multiple second precoding matrix indication information correspond to channel states of multiple transmission layers.

[0108] For example, in MIMO communications, multiple transmission layers can generally be multiplexed, and each transmission layer can independently transmit data. During the channel information feedback process, each transmission layer also needs to separately feedback channel state indication information. When using a codebook-based feedback method, the PMI includes the PMI of each transmission layer. The PMI of each transmission layer can include first precoding matrix indication information and second precoding matrix indication information. The frequency domain feedback granularity corresponding to the second precoding matrix indication information of each transmission layer can be independently configured.

[0109] In some embodiments, frequency domain feedback granularities corresponding to at least two pieces of second precoding matrix indication information among the multiple pieces of second precoding matrix indication information are different.

[0110] In some embodiments, the second precoding matrix indication information included in the PMIs of multiple transmission layers corresponds to different frequency domain feedback granularities of the second precoding matrix indication information included in the PMIs of at least two transmission layers.

[0111] In some embodiments, at least two pieces of second precoding matrix indication information among the plurality of second precoding matrix indication information each include first sub-precoding matrix indication information and second sub-precoding matrix indication information. The first sub-precoding matrix indication information of the at least two pieces of second precoding matrix indication information corresponds to different frequency domain feedback granularities, or the second sub-precoding matrix indication information of the at least two pieces of second precoding matrix indication information corresponds to different frequency domain feedback granularities.

[0112] In some embodiments, the frequency domain feedback granularity corresponding to the indication information is determined based on signaling or based on a configuration parameter.

[0113] S103: Send channel state information.

[0114] It is understood that after determining the channel state information, the channel state information can be sent for feedback, and the communication node receiving the channel state information can determine an appropriate downlink transmission configuration based on the channel state information, such as information modulation configuration, MIMO array precoding configuration, etc.

[0115] Based on this, the frequency domain feedback granularity corresponding to different indication information is determined respectively, which can more reasonably configure the number of different indication information that need to be fed back within the communication bandwidth. For slowly changing channel attributes, if its indication information is still configured according to the frequency domain feedback granularity of the fast-changing attribute, it will lead to a waste of feedback resources. Compared with the related art in which different indication information in the channel state information uses the same frequency domain feedback granularity, the technical solution provided by the present disclosure can have different frequency domain resource granularities corresponding to different indication information in the multiple indication information included in the channel state information. In this way, the system can optimize the feedback overhead without affecting the accuracy of the channel feedback.

[0116] An embodiment of the present disclosure provides another channel state information feedback method, which is applied to a second node.

[0117] like Figure 7 As shown, the method includes the following steps:

[0118] S201: Send a reference signal.

[0119] The reference signal may include a CSI-RS and a SS. The reference signal may also include other types of reference signals in addition to the above-mentioned reference signals of the same type, which is not limited in the present disclosure.

[0120] S202: Receive channel state information, where the channel state information includes multiple indication information, and frequency domain resource granularities corresponding to at least two of the multiple indication information are different.

[0121] In some embodiments, the plurality of indication information includes at least first precoding matrix indication information and second precoding matrix indication information. The first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set. The second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information.

[0122] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are configured independently.

[0123] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are different.

[0124] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information; or, the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information, where M is a positive integer greater than or equal to 1.

[0125] In some embodiments, the multiple indication information also includes channel quality indication information; wherein the channel quality indication information includes first channel quality indication information and second channel quality indication information, and the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are independently configured respectively.

[0126] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are different.

[0127] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information is N times the frequency domain feedback granularity corresponding to the second channel quality indication information; or, the frequency domain feedback granularity corresponding to the second channel quality indication information is N times the frequency domain feedback granularity corresponding to the first channel quality indication information, where N is a positive integer greater than or equal to 1.

[0128] In some embodiments, the multiple indication information further includes channel quality indication information, wherein the frequency domain feedback granularity corresponding to the channel quality indication information and the frequency domain feedback granularity corresponding to the second precoding matrix indication information are independently configured.

[0129] In some embodiments, the frequency domain feedback granularity corresponding to the second precoding matrix indication information is different from the frequency domain feedback granularity corresponding to the channel quality indication information.

[0130] In some embodiments, a frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to the channel quality indication information.

[0131] In some embodiments, the channel quality indication information includes first channel quality indication information and second channel quality indication information, wherein a frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to at least one of the first channel quality indication information and the second channel quality indication information.

[0132] In some embodiments, the multiple indication information further includes channel quality indication information; wherein the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are independently configured.

[0133] In some embodiments, the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are different.

[0134] In some embodiments, there are multiple second precoding matrix indication information, and the frequency domain feedback granularities corresponding to the multiple second precoding matrix indication information are independently configured. The multiple second precoding matrix indication information correspond to channel states of multiple transmission layers.

[0135] In some embodiments, frequency domain feedback granularities corresponding to at least two pieces of second precoding matrix indication information among the multiple pieces of second precoding matrix indication information are different.

[0136] In some embodiments, the second precoding matrix indication information included in the PMIs of multiple transmission layers corresponds to different frequency domain feedback granularities of the second precoding matrix indication information included in the PMIs of at least two transmission layers.

[0137] In some embodiments, at least two pieces of second precoding matrix indication information among the plurality of second precoding matrix indication information each include first sub-precoding matrix indication information and second sub-precoding matrix indication information. The first sub-precoding matrix indication information of the at least two pieces of second precoding matrix indication information corresponds to different frequency domain feedback granularities, or the second sub-precoding matrix indication information of the at least two pieces of second precoding matrix indication information corresponds to different frequency domain feedback granularities.

[0138] In some embodiments, the frequency domain feedback granularity corresponding to the indication information is determined based on signaling or based on a configuration parameter.

[0139] Based on this, when the channel state information contains multiple indicators, and these indicators correspond to different frequency domain resource granularities, the system can more comprehensively understand the characteristics of the channel in different frequency bands, thereby improving the accuracy of channel estimation. This helps optimize data transmission strategies and improve communication quality.

[0140] The above mainly introduces the solution of the embodiment of the present disclosure from the perspective of method. The following also shows a channel state information feedback device, which is used to execute the channel state information feedback method of any of the above embodiments and possible implementations thereof. A channel state information feedback device is used to execute the channel state information feedback method of any of the above embodiments and possible implementations thereof.

[0141] It is understandable that the feedback device for channel state information includes hardware structures and / or software modules that perform corresponding functions in order to implement the feedback method for channel state information; those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments of the present disclosure, the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software-driven hardware manner depends on the preset application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each preset application, but such implementation should not be considered to be beyond the scope of the present disclosure.

[0142] The embodiments of the present disclosure can divide the channel state information feedback device into functional modules according to the above-mentioned method embodiments. For example, each functional module can be divided corresponding to each function, or two or more functions can be integrated into one functional module. The above-mentioned integrated modules can be implemented in the form of hardware or software. It should be noted that the division of modules in the embodiments of the present disclosure is schematic and is only a logical functional division. In actual implementation, there may be other division methods. The following is an example of dividing each functional module corresponding to each function.

[0143] Figure 8 3 is a schematic diagram of a channel state information feedback device according to an embodiment of the present disclosure. The channel state information feedback device 300 includes: a communication module 301 and a processing module 302.

[0144] Communication module 301, configured to receive a reference signal;

[0145] A processing module 302 is configured to determine channel state information based on a reference signal, where the channel state information includes multiple indication information, the multiple indication information including at least first precoding matrix indication information and second precoding matrix indication information; the first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set; the second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information; and at least two of the multiple indication information correspond to different frequency domain feedback granularities.

[0146] The communication module 301 is further configured to send channel state information.

[0147] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are configured independently.

[0148] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are different.

[0149] In some embodiments, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information; or, the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information, where M is a positive integer greater than or equal to 1.

[0150] In some embodiments, the multiple indication information also includes channel quality indication information; wherein the channel quality indication information includes first channel quality indication information and second channel quality indication information, and the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are independently configured respectively.

[0151] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are different.

[0152] In some embodiments, the frequency domain feedback granularity corresponding to the first channel quality indication information is N times the frequency domain feedback granularity corresponding to the second channel quality indication information; or, the frequency domain feedback granularity corresponding to the second channel quality indication information is N times the frequency domain feedback granularity corresponding to the first channel quality indication information, where N is a positive integer greater than or equal to 1.

[0153] In some embodiments, the multiple indication information further includes channel quality indication information, wherein the frequency domain feedback granularity corresponding to the channel quality indication information and the frequency domain feedback granularity corresponding to the second precoding matrix indication information are independently configured.

[0154] In some embodiments, the frequency domain feedback granularity corresponding to the second precoding matrix indication information is different from the frequency domain feedback granularity corresponding to the channel quality indication information.

[0155] In some embodiments, a frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to the channel quality indication information.

[0156] In some embodiments, the channel quality indication information includes first channel quality indication information and second channel quality indication information; wherein, at least one corresponding frequency domain feedback granularity in the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from at least one corresponding frequency domain feedback granularity in the first channel quality indication information and the second channel quality indication information.

[0157] In some embodiments, the multiple indication information further includes channel quality indication information; wherein the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are independently configured.

[0158] In some embodiments, the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are different.

[0159] In some embodiments, there are multiple second precoding matrix indication information, and the frequency domain feedback granularities corresponding to the multiple second precoding matrix indication information are independently configured, wherein the multiple second precoding matrix indication information correspond to the channel states of multiple transmission layers.

[0160] In some embodiments, frequency domain feedback granularities corresponding to at least two pieces of second precoding matrix indication information among the multiple pieces of second precoding matrix indication information are different.

[0161] In some embodiments, at least two second precoding matrix indication information among multiple second precoding matrix indication information both include first sub-precoding matrix indication information and second sub-precoding matrix indication information; wherein, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information of the at least two second precoding matrix indication information is different, or the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information of the at least two second precoding matrix indication information is different.

[0162] In some embodiments, the frequency domain feedback granularity corresponding to the indication information is determined based on signaling or based on a configuration parameter.

[0163] Figure 9 4 is a schematic diagram of a channel state information feedback apparatus provided by an embodiment of the present disclosure, which is applied to a second node. The channel state information feedback apparatus 400 includes: a communication module 401.

[0164] Communication module 401, configured to send a reference signal;

[0165] The communication module 401 is further configured to receive channel state information sent by the first node, where the channel state information includes multiple indication information, and frequency domain resource granularities corresponding to at least two of the multiple indication information are different.

[0166] In some embodiments, the plurality of indication information includes at least first precoding matrix indication information and second precoding matrix indication information. The first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set. The second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information.

[0167] The specific content about the frequency domain resource granularity corresponding to the multiple indication information will not be further elaborated here, and reference can be made to the above description.

[0168] In the case of implementing the functions of the above-mentioned integrated modules in the form of hardware, the embodiment of the present disclosure further provides a possible structure of a communication device, which is used to execute the channel state information feedback method provided by the embodiment of the present disclosure. Figure 10As shown, the communication device 500 includes: a communication interface 503, a processor 502 and a bus 504. Optionally, the communication device may further include a memory 501.

[0169] Processor 502 may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this disclosure. Processor 502 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the embodiments of this disclosure. Processor 502 may also be a combination that implements computing functions, such as a combination of one or more microprocessors, or a combination of a DSP and a microprocessor.

[0170] The communication interface 503 is used to connect to other devices via a communication network, such as Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0171] The memory 501 may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (EEPROM), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

[0172] As a possible implementation, the memory 501 may exist independently of the processor 502. The memory 501 may be connected to the processor 502 via a bus 504 and used to store instructions or program codes. When the processor 502 calls and executes the instructions or program codes stored in the memory 501, the channel state information feedback method provided in the embodiment of the present disclosure can be implemented.

[0173] In another possible implementation, the memory 501 may also be integrated with the processor 502 .

[0174] The bus 504 may be an extended industry standard architecture (EISA) bus, etc. The bus 504 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 10 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0175] Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium), which stores computer program instructions. When the computer program instructions are executed on a computer, the computer executes the channel state information feedback method as described in any of the above embodiments.

[0176] In an exemplary embodiment, the computer may be the aforementioned communication device, and the present disclosure does not limit the specific form of the computer.

[0177] In some examples, the computer-readable storage media described above may include, but are not limited to, magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical disks (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), cards, sticks, or key drives, etc.). The various computer-readable storage media described in this disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0178] An embodiment of the present disclosure provides a computer program product comprising instructions. When the computer program product is run on a computer, the computer is enabled to execute the channel state information feedback method described in any one of the above embodiments.

[0179] The above is only a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or replacements within the technical scope disclosed in the present disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A method for feeding back channel state information, characterized in that: The method comprises: receiving a reference signal; Determining channel state information based on the reference signal, the channel state information including multiple indication information, the multiple indication information including at least first precoding matrix indication information and second precoding matrix indication information; the first precoding matrix indication information is used to determine a codeword set, and the second precoding matrix indication information is used to determine a position of a target codeword in the codeword set; the second precoding matrix indication information includes first sub-precoding matrix indication information and second sub-precoding matrix indication information; at least two of the multiple indication information correspond to different frequency domain feedback granularities; The channel state information is sent.

2. The method according to claim 1, characterized in that The frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are configured independently.

3. The method according to claim 2, characterized in that The frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information and the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information are different.

4. The method according to claim 2, characterized in that The frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information; or, the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information is M times the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information, where M is a positive integer greater than or equal to 1.

5. The method according to claim 1, wherein The multiple indication information also includes channel quality indication information; wherein, the channel quality indication information includes first channel quality indication information and second channel quality indication information, and the frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are independently configured respectively.

6. The method according to claim 5, characterized in that The frequency domain feedback granularity corresponding to the first channel quality indication information and the frequency domain feedback granularity corresponding to the second channel quality indication information are different.

7. The method according to claim 5, characterized in that The frequency domain feedback granularity corresponding to the first channel quality indication information is N times the frequency domain feedback granularity corresponding to the second channel quality indication information; or, the frequency domain feedback granularity corresponding to the second channel quality indication information is N times the frequency domain feedback granularity corresponding to the first channel quality indication information, where N is a positive integer greater than or equal to 1.

8. The method according to claim 1, characterized in that The multiple indication information further includes channel quality indication information, wherein the frequency domain feedback granularity corresponding to the channel quality indication information and the frequency domain feedback granularity corresponding to the second precoding matrix indication information are independently configured.

9. The method according to claim 8, characterized in that The frequency domain feedback granularity corresponding to the second precoding matrix indication information is different from the frequency domain feedback granularity corresponding to the channel quality indication information.

10. The method according to claim 9, characterized in that A frequency domain feedback granularity corresponding to at least one of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from a frequency domain feedback granularity corresponding to the channel quality indication information.

11. The method according to claim 8, characterized in that The channel quality indication information includes first channel quality indication information and second channel quality indication information; wherein, at least one corresponding frequency domain feedback granularity of the first sub-precoding matrix indication information and the second sub-precoding matrix indication information is different from at least one corresponding frequency domain feedback granularity of the first channel quality indication information and the second channel quality indication information.

12. The method according to claim 1, characterized in that The multiple indication information also includes channel quality indication information; wherein, the frequency domain feedback granularity corresponding to the first precoding matrix indication information and the frequency domain feedback granularity corresponding to the channel quality indication information are independently configured respectively.

13. The method according to claim 12, characterized in that The frequency domain feedback granularity corresponding to the first precoding matrix indication information is different from the frequency domain feedback granularity corresponding to the channel quality indication information.

14. The method according to claim 1, wherein There are multiple pieces of second precoding matrix indication information, and the frequency domain feedback granularities corresponding to the multiple pieces of second precoding matrix indication information are independently configured respectively; wherein the multiple pieces of second precoding matrix indication information correspond to channel states of multiple transmission layers.

15. The method according to claim 14, characterized in that At least two pieces of second precoding matrix indication information among the multiple pieces of second precoding matrix indication information correspond to different frequency domain feedback granularities.

16. The method according to claim 14, characterized in that At least two second precoding matrix indication information among the multiple second precoding matrix indication information both include first sub-precoding matrix indication information and second sub-precoding matrix indication information; wherein, the frequency domain feedback granularity corresponding to the first sub-precoding matrix indication information of the at least two second precoding matrix indication information is different, or the frequency domain feedback granularity corresponding to the second sub-precoding matrix indication information of the at least two second precoding matrix indication information is different.

17. The method according to claim 1, wherein The frequency domain feedback granularity corresponding to the indication information is determined based on signaling or based on a configuration parameter.

18. A communication device, characterized in that: include: memory and processor; Memory and processor coupling; The memory is used to store instructions executable by the processor; When the processor executes the instructions, the method according to any one of claims 1 to 17 is performed.

19. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are executed on a communication device, the communication device is caused to perform the method according to any one of claims 1 to 17.

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