Channel state information (CSI) reporting method, terminal, and network side device

Abstract

The present application relates to the technical field of communications, and discloses a channel state information (CSI) reporting method, a terminal, and a network side device. The method in embodiments of the present application comprises: a terminal determines a CSI report; and the terminal sends the CSI report to a network side device, wherein the CSI report comprises first information and a rank indicator (RI), and the first information is used for indicating the number of layers corresponding to a precoding matrix indicator (PMI) comprised in the CSI report.

Description

Channel State Information (CSI) reporting methods, terminals, and network-side equipment

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411553054.0, filed on November 1, 2024, entitled “Method for Reporting Channel State Information (CSI), Terminal and Network Side Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of communication technology, specifically relating to a method, terminal and network-side device for reporting Channel State Information (CSI). Background Technology

[0004] In related technologies, taking the Precoding Matrix Indicator (PMI) in CSI as an example, network-side devices can infer the PMI of another port pattern based on the PMI of one port pattern. This allows the terminal to report only the PMI of one port pattern when reporting CSI, thereby reducing CSI reporting overhead.

[0005] However, in the CSI reports provided by related technologies, since the number of layers corresponding to PMI is the same as the number of layers indicated by the Rank indicator (RI), and the correlation between PMIs of different layers is weak, there are still problems such as inaccurate inference results when inferring the PMI corresponding to a large port pattern from the PMI corresponding to a small port pattern, which affects the performance of the communication system. Summary of the Invention

[0006] This application provides a CSI reporting method, terminal, and network-side device, which can improve the accuracy of inference results and ensure the performance of the communication system.

[0007] In a first aspect, a method for reporting CSI is provided, comprising: a terminal determining a CSI report; the terminal sending the CSI report to a network-side device; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0008] Secondly, a method for reporting CSI is provided, comprising: a terminal receiving first indication information or second indication information from a network-side device; the terminal sending a CSI report to the network-side device according to the first indication information or the second indication information; wherein, the first indication information is used to trigger the reporting of N aperiodic CSIs, the N aperiodic CSIs being reported at different times and all N aperiodic CSIs being associated with the same reporting configuration information, and N being an integer greater than 1; the second indication information is used to activate the reporting of semi-persistent CSIs, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0009] Thirdly, a method for reporting CSI is provided, comprising: a network-side device receiving a CSI report from a terminal; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0010] Fourthly, a method for reporting CSI is provided, comprising: a network-side device sending a first indication message or a second indication message to a terminal; wherein the first indication message is used to trigger the reporting of N aperiodic CSIs, wherein the reporting times of the N aperiodic CSIs are different and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1; the second indication message is used to activate the reporting of semi-persistent CSIs and to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0011] Fifthly, a CSI reporting device is provided, comprising: a processing module for determining a CSI report; and a transmission module for sending the CSI report to a network-side device; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0012] In a sixth aspect, a CSI reporting device is provided, comprising: a transmission module, configured to receive first indication information or second indication information from a network-side device; the terminal sending a CSI report to the network-side device according to the first indication information or the second indication information; wherein, the first indication information is configured to trigger the reporting of N aperiodic CSIs, the N aperiodic CSIs having different reporting times and all N aperiodic CSIs being associated with the same reporting configuration information, and N being an integer greater than 1; the second indication information is configured to activate the reporting of semi-persistent CSIs, and the second indication information is further configured to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0013] In a seventh aspect, a CSI reporting device is provided, comprising: a transmission module for receiving a CSI report from a terminal; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0014] Eighthly, a CSI reporting device is provided, comprising: a transmission module for sending a first indication information or a second indication information to a terminal; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, wherein the reporting times of the N aperiodic CSIs are different and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1; the second indication information is used to activate the reporting of semi-persistent CSIs and to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0015] In a ninth aspect, an apparatus for reporting CSI is provided, the apparatus being configured to perform the steps of the method described in the first aspect, or implement the steps of the method described in the second aspect, or implement the steps of the method described in the third aspect, or implement the steps of the method described in the third aspect.

[0016] In a tenth aspect, a terminal is provided, the terminal including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the first or second aspect.

[0017] Eleventhly, a terminal is provided, including a processor and a communication interface, wherein the processor is used to determine a CSI report, and the communication interface is used to send the CSI report to a network-side device; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0018] Eleventhly, a terminal is provided, including a processor and a communication interface, wherein the communication interface is used to receive first indication information or second indication information from a network-side device; the terminal sends a CSI report to the network-side device according to the first indication information or the second indication information; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, the N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information, and N is an integer greater than 1; the second indication information is used to activate the reporting of semi-persistent CSIs, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0019] In a twelfth aspect, a network-side device is provided, the network-side device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in the third or fourth aspect.

[0020] In a thirteenth aspect, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used to receive a CSI report from a terminal; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0021] In a fourteenth aspect, a network-side device is provided, including a processor and a communication interface, wherein the communication interface is used to send a first indication information or a second indication information to a terminal; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, wherein the N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information, and N is an integer greater than 1; the second indication information is used to activate the reporting of semi-persistent CSIs and to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0022] In a fourteenth aspect, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by a processor, implement the steps of the method described in the first aspect, or the steps of the method described in the second aspect, or the steps of the method described in the third aspect, or the steps of the method described in the fourth aspect.

[0023] In a fifteenth aspect, a wireless communication system is provided, comprising: a terminal and a network-side device, wherein the terminal is configured to perform steps of the method as described in the first or second aspect, and the network-side device is configured to perform steps of the method as described in the third or fourth aspect.

[0024] In a sixteenth aspect, a chip is provided, the chip including a processor and a communication interface coupled to the processor, the processor being configured to run a program or instructions to implement the steps of the method as described in the first aspect, or the steps of the method as described in the second aspect, or the steps of the method as described in the third aspect, or the steps of the method as described in the fourth aspect.

[0025] In a seventeenth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the method as described in the first aspect, or the steps of the method as described in the second aspect, or the steps of the method as described in the third aspect, or the steps of the method as described in the fourth aspect.

[0026] In this embodiment of the application, by additionally carrying first information in the CSI report to indicate the layer number corresponding to the PMI, the layer number corresponding to the PMI is decoupled from the layer number indicated by the RI, thereby improving the accuracy of the inference results when the network-side device performs inference such as PMI based on the CSI report, and ensuring the performance of the communication system. Attached Figure Description

[0027] Figure 1 is a schematic diagram of the structure of a wireless communication system provided in an exemplary embodiment of this application.

[0028] Figure 2 is one of the flowcharts of a CSI reporting method provided in an exemplary embodiment of this application.

[0029] Figure 3a is one of the sub-process diagrams of the CSI reporting method provided in an exemplary embodiment of this application.

[0030] Figure 3b is a second schematic diagram of a sub-process of the CSI reporting method provided in an exemplary embodiment of this application.

[0031] Figure 3c is a third sub-process diagram of the CSI reporting method provided in an exemplary embodiment of this application.

[0032] Figure 4a is one of the interactive flow diagrams of the CSI reporting method provided in an exemplary embodiment of this application.

[0033] Figure 4b is a second schematic diagram of the interactive flow of the CSI reporting method provided in an exemplary embodiment of this application.

[0034] Figure 4c is the third interactive flowchart of the CSI reporting method provided in an exemplary embodiment of this application.

[0035] Figure 4d is a schematic diagram of the interaction flow of the CSI reporting method provided in an exemplary embodiment of this application.

[0036] Figure 5 is a second flowchart illustrating the CSI reporting method provided in an exemplary embodiment of this application.

[0037] Figure 6 is a flowchart of the CSI reporting method provided in an exemplary embodiment of this application.

[0038] Figure 7 is a fourth flowchart illustrating the CSI reporting method provided in an exemplary embodiment of this application.

[0039] Figure 8 is one of the structural schematic diagrams of a CSI reporting device provided in an exemplary embodiment of this application.

[0040] Figure 9 is a second schematic diagram of the structure of the CSI reporting device provided in an exemplary embodiment of this application.

[0041] Figure 10 is a third schematic diagram of the structure of a CSI reporting device provided in an exemplary embodiment of this application.

[0042] Figure 11 is a fourth schematic diagram of the structure of a CSI reporting device provided in an exemplary embodiment of this application.

[0043] Figure 12 is a schematic diagram of the structure of a communication device provided in an exemplary embodiment of this application.

[0044] Figure 13 is a schematic diagram of the structure of a terminal provided in an exemplary embodiment of this application.

[0045] Figure 14 is a schematic diagram of the structure of a network-side device provided in an exemplary embodiment of this application. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0047] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, not limited in number; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, the scope of protection for "A or B" covers at least three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. In addition, the terms "A and / or B," "at least one of A and B," and "at least one of A or B" also cover at least the above three scenarios. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0048] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc., in the instruction sent. An indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0049] It is worth noting that the technologies described in this application are not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA), or other systems. The terms "system" and "network" in this application are often used interchangeably, and the described technologies can be used in the systems and radio technologies mentioned above, as well as in other systems and radio technologies. The following description describes New Radio (NR) systems for illustrative purposes, and the term NR is used in most of the following description; however, these technologies can also be applied to systems other than NR systems, such as 6th Generation (6G) communication systems.

[0050] Figure 1 shows a block diagram of a wireless communication system applicable to an embodiment of this application. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a mobile phone, tablet computer, laptop computer, notebook computer, personal digital assistant (PDA), handheld computer, netbook, ultra-mobile personal computer (UMPC), mobile internet device (MID), augmented reality (AR), virtual reality (VR) device, robot, wearable device, flight vehicle, vehicle user equipment (VUE), shipboard equipment, pedestrian user equipment (PUE), smart home (home devices with wireless communication capabilities, such as refrigerators, televisions, washing machines, or furniture), game console, personal computer (PC), ATM, or self-service machine, etc. Wearable devices include: smartwatches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart chains, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among these, in-vehicle devices can also be referred to as in-vehicle terminals, in-vehicle controllers, in-vehicle modules, in-vehicle components, in-vehicle chips, or in-vehicle units, etc. It should be noted that the specific type of terminal 11 is not limited in this application embodiment. Network-side equipment 12 may include access network equipment or core network equipment, wherein access network equipment may also be referred to as Radio Access Network (RAN) equipment, radio access network function, or radio access network unit. Access network equipment may include base stations, Wireless Local Area Network (WLAN) access points (AS), or Wireless Fidelity (WiFi) nodes, etc.The term "base station" can be referred to as Node B (NB), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio Node B (NR Node B), Access Point, Relay Base Station (RBS), Serving Base Station (SBS), Base Transceiver Station (BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (ESS), Home Node B (HNB), Home Evolved Node B, Transmit / Receive Point (TRP), or any other suitable term in the relevant field, as long as the same technical effect is achieved. The term "base station" is not limited to any specific technical terminology. It should be noted that this application embodiment only uses a base station in an NR system as an example for description and does not limit the specific type of base station.

[0051] Core network equipment, also known as core network nodes, core network functions, or core network elements, includes, but is not limited to, at least one of the following: Mobility Management Entity (MME), Access and Mobility Management Function (AMF), Session Management Function (SMF), User Plane Function (UPF), Policy Control Function (PCF), Policy and Charging Rules Function (PCRF), Edge Application Server Discovery Function (EASDF), Unified Data Management (UDM), Unified Data Repository (UDR), Home Subscriber Server (HSS), Centralized network configuration (CNC), Network Repository Function (NRF), Network Exposure Function (NEF), Local NEF (or L-NEF), and Binding Support. The core network functions include: BSF (Block Network Function), Application Function (AF), Location Management Function (LMF), Gateway Mobile Location Centre (GMLC), and Network Data Analytics Function (NWDAF). It should be noted that this application embodiment only uses core network equipment in the NR system as an example and does not limit the specific type of core network equipment. If the name of the core network equipment mentioned in this application embodiment changes in subsequent protocol versions (e.g., 6G), it will still be within the scope of protection of this application.

[0052] Optionally, the core network equipment can be implemented by one or more functional modules in a single device, or by multiple devices working together; this application does not specifically limit this. It is understood that the aforementioned functional modules can be network elements in hardware devices, software functional modules running on dedicated hardware, or virtualized functional modules instantiated on a platform (e.g., a cloud platform).

[0053] In addition, for ease of understanding, the relevant technologies involved in this application are described below.

[0054] 1. CSI reporting in NR

[0055] In 5G communication systems, the introduction of massive MIMO technology can significantly improve spectral efficiency. However, this requires the base station to know the downlink channel information in order to apply appropriate precoding to the data channel. Specifically, for Frequency Division Duplexing (FDD), the uplink and downlink channels are not completely reciprocal; the base station cannot directly obtain downlink channel information and requires the terminal to provide CSI (Continuous Signal Input).

[0056] The network associates each CSI reporting configuration (CSI-ReportConfig) with a reference signal resource configuration (e.g., CSI-ResourceConfig) for channel measurement, a reference signal resource configuration for interference measurement associated with CSI Interference Measurement (CSI-IM), and / or a reference signal resource configuration for interference measurement associated with Non-Zero Power CSI-RS (NZP-CSI RS) resources. The terminal then obtains the corresponding channel information by measuring the reference resources associated with these reference signal resource configurations. Further, based on the codebook configuration information and report content associated with the CSI report configuration, it obtains the corresponding CSI and provides feedback based on the uplink channel, such as on the Physical Uplink Shared Channel (PUSCH) or the Physical Uplink Control Channel (PUCCH).

[0057] The reference signal resource configuration used for channel measurements is associated with at least one NZP-CSI-RS resource set (NZP-CSI RS-ResourceSet). For periodic and semi-persistent reporting, only one CSI-RS resource set is configured; for aperiodic reporting, multiple CSI-RS resource sets can be configured, and the base station will indicate which CSI-RS resource set to use for reporting. Each CSI-RS resource set contains at least one CSI-RS resource (NZP-CSI RS-Resource).

[0058] The terminal will measure the CSI-RS on the configured CSI-RS resources and feed back the CSI according to the base station's configuration. The CSI includes a channel quality indicator (CQI), a rank indicator (RI), and a precoding matrix indicator (PMI). The PMI is reported in the form of a codebook, such as a Type-I codebook, Type-II codebook, eType-II codebook, or FeType-II codebook. It should be noted that the number of layers in the PMI is the same as the number of layers indicated by the RI, and the selectable values ​​for both are indicated by the rank restriction (ri-Restriction). The CQI is calculated based on the reported PMI. The CQI and PMI mentioned above will be used by the base station to determine the precoding to be used for subsequent data transmission.

[0059] Because the feedback overhead of PMI varies depending on the layer, the base station needs to know the specific PMI overhead for decoding. Therefore, existing protocols divide CSI reporting into two parts: Part 1 and Part 2. Part 1 has a fixed overhead, with RI (Information Reflection) placed in Part 1 and PMI in Part 2; therefore, Part 2 overhead is variable. Since Part 1 overhead is constant, the base station can decode Part 1 without any information, thereby determining the PMI layer number through the RI in Part 1, and combining other information from Part 1 (such as the total number of non-zero combination coefficients) to obtain the PMI overhead, thus determining the overhead of Part 2 for subsequent decoding.

[0060] As the size of the antenna array on the base station side increases, energy consumption will also increase. Base stations can save energy by shutting down radio frequency channels. However, in order to determine which ports to shut down and which appropriate precoding to use for data transmission after shutting down the ports, the base station needs to obtain channel information under different port shutdown methods. Therefore, in NR Rel-18, to enhance the acquisition of CSI under Network Energy Saving (NES), the terminal will report the CSI under different channel shutdown methods in a single CSI report.

[0061] For example, for spatial adaptive type 1 (i.e., when a port is turned off, the antenna array connected to it is also turned off simultaneously), the base station will configure L sub-configurations (CSI-ReportSubConfig) in the CSI reporting configuration (CSI-ReportConfig), each sub-configuration corresponding to a port pattern. For each sub-configuration, the terminal will report a PMI. For example, the terminal will report the PMIs corresponding to the above multiple sub-configurations in a single CSI report.

[0062] Of course, in addition to reporting a PMI for each sub-configuration as mentioned above, to reduce feedback overhead, only the PMIs corresponding to some sub-configurations can be reported. For the PMIs corresponding to unreported sub-configurations, the base station can use the correlation between channels corresponding to different port patterns to infer the PMIs for those unreported sub-configurations. For example, assuming the terminal reports a PMI corresponding to sub-configuration A (corresponding to a small port pattern) but does not report a PMI corresponding to sub-configuration B (corresponding to a small port pattern), then the network-side equipment can use methods such as AI models to infer the PMI corresponding to another large port pattern from the reported PMI corresponding to a small port pattern.

[0063] However, it is worth noting that in the aforementioned CSI reporting scheme, since the number of layers corresponding to PMI is the same as the number of layers indicated by RI, and the correlation between PMIs of different layers is weak (which can be understood as poor accuracy in inferring the precoding of layer j from the precoding of layer i), based on the aforementioned CSI reporting scheme, there are still problems such as inaccurate inference results when inferring the PMI corresponding to a large port pattern (also known as a large port number pattern) from the PMI corresponding to a reported small port pattern (also known as a small port number pattern), which affects the performance of the communication system.

[0064] For example, assuming the RI corresponding to the large port pattern is 3, the RI corresponding to the small port pattern is 2, and the layer number corresponding to the PMI corresponding to the reported small port pattern is 2, then if the precoding of the layer 3 corresponding to the large port pattern is inferred from the small port pattern in the CSI report reported based on the CSI reporting scheme provided above, the PMI corresponding to the large port pattern inferred from the PMI corresponding to the small port pattern will be inaccurate due to the lack of precoding information for the layer 3 corresponding to the small port pattern.

[0065] To address this, this application provides a CSI reporting scheme. By decoupling the layer number information corresponding to the PMI carried in the CSI report from the layer number information indicated by the RI, the layer number of the PMI corresponding to the reported small port pattern can be greater than or equal to the RI corresponding to the large port pattern (even if the RI corresponding to the small port pattern may be less than or equal to the RI corresponding to the large port pattern). This provides more information for the inference process of network-side devices (such as base stations). Specifically, when inferring the precoding of each layer corresponding to the large port pattern, the precoding information of the corresponding transport layer corresponding to the small port pattern can be provided, thereby improving the accuracy of the inference results and ensuring the performance of the communication system.

[0066] Based on this, the technical solutions provided by the embodiments of this application will be described in detail below with reference to the accompanying drawings and through some embodiments and application scenarios.

[0067] Figure 2 shows a flowchart of a CSI reporting method 200 provided in an exemplary embodiment of this application. This method 200 can be executed by, but is not limited to, a terminal, specifically by hardware and / or software installed in the terminal. In this embodiment, the method 200 may include at least the following steps.

[0068] S210, the terminal confirms the CSI report.

[0069] The CSI report can be a periodic CSI report, an aperiodic CSI report, a semi-persistent CSI report, etc., and there are no restrictions on this.

[0070] S220, the terminal sends the CSI report to the network-side device.

[0071] The CSI report may include, but is not limited to, first information and RI. The RI is used to indicate the number of data streams that can be transmitted in parallel in the communication network, and the number of data streams can also be understood as the number of layers, rank size, etc.

[0072] The first information is used to indicate the layer number corresponding to the PMI included in the CSI report. The layer number corresponding to the PMI can be understood as the layer number of the precoding matrix indicated by the PMI carried in the CSI report.

[0073] In other words, compared to the limitation in related technologies that the number of layers corresponding to the PMI in the CSI report must be the same as the number of layers indicated by the RI, this embodiment of the application achieves the purpose of decoupling the number of layers corresponding to the PMI from the number of layers indicated by the RI by additionally carrying first information in the CSI report to indicate the number of layers corresponding to the PMI. That is, in this embodiment, the number of layers corresponding to the PMI indicated by the first information can be the same as the number of layers indicated by the RI, or the number of layers corresponding to the PMI indicated by the first information can be greater than the number of layers indicated by the RI. This avoids the problem in related technologies that the number of layers corresponding to the PMI in the CSI report must be the same as the number of layers indicated by the RI, improves the accuracy of the inference results when the network-side device performs inference such as PMI based on the CSI report, and ensures the performance of the communication system.

[0074] In particular, for cases where the layer number corresponding to the PMI indicated by the first information can be greater than the layer number indicated by the RI, this embodiment can also provide more information for network-side devices to perform PMI inference based on AI models, etc. For example, assuming that the network-side device needs to infer the precoding of each layer corresponding to the large port pattern through the PMI corresponding to the small port pattern, this embodiment can provide the precoding information of the corresponding transport layer corresponding to the small port pattern through the first information and the corresponding PMI. Even if the RI corresponding to the large port pattern is greater than the RI corresponding to the small port pattern, the network-side device can infer a more accurate PMI corresponding to the large port pattern based on the PMI corresponding to the small port pattern reported by the terminal, thereby obtaining higher network throughput.

[0075] It is worth noting that when the network-side device performs PMI inference based on the AI ​​model, the PMIs corresponding to different antenna port subsets under the same antenna array have a strong spatial correlation, such as the same or similar channel parameters they experience (e.g., path delay, angle of arrival).

[0076] Optionally, the AI ​​model mentioned in the context of this application may also be called a deep learning model, such as, but not limited to, neural networks, decision trees, support vector machines, Bayesian classifiers, etc.

[0077] In some embodiments, for the first information, this embodiment can utilize the characteristic that the overhead of Part 1 in the CSI report is fixed or unchanging, and carry the first information in Part 1 of the CSI report, so that the network-side device can decode Part 1 without needing any information to obtain the first information, that is, the layer number corresponding to PMI. In this way, the network-side device can determine the overhead of PMI based on the first information, and then determine the overhead of Part 2 in the CSI report, which facilitates subsequent decoding.

[0078] In some embodiments, the process of the terminal determining the CSI report described in S210 can be varied. For example, in this embodiment, the process of the terminal determining the CSI report can include, but is not limited to, S2101-S2102 shown in FIG3a, as follows.

[0079] S2101, the terminal obtains the reporting configuration information (or feedback configuration information) for CSI reporting.

[0080] The reporting configuration information is used to configure relevant information when the terminal performs CSI reporting. In this embodiment, the reporting configuration information may include or indicate any one of the following 11)-12).

[0081] 11) First type of rank restriction (ri-Restriction) and second type of rank restriction. The first type of rank restriction is used to indicate the possible values ​​(or possible values) of the RI, and the second type of rank restriction is used to indicate the possible values ​​of the number of layers corresponding to the PMI.

[0082] In this case, as an optional implementation, the maximum value among the optional values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit. This ensures that the number of layers corresponding to the PMI reported by the terminal in the CSI report is greater than or equal to the number of layers indicated by the RI, thereby providing more information for the PMI inference process of the network-side device.

[0083] For example, assuming that the first type of rank restriction indicates that the possible values ​​of the RI are one of {2, 3}, then the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction can be {3, 4} or {3}, but cannot include 1 and 2.

[0084] As an alternative implementation, the maximum value among the possible values ​​of the RI indicated by the first type of rank constraint is less than or equal to the maximum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank constraint, and the minimum value among the possible values ​​of the RI indicated by the first type of rank constraint is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank constraint. This allows the number of layers corresponding to the PMI reported by the terminal in the CSI report to be greater than or equal to the number of layers indicated by the RI, thereby providing more information for the PMI inference process of network-side devices.

[0085] For example, assuming that the first type of rank restriction indicates that the possible values ​​of the RI are one of {2, 3}, then the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction cannot contain 1, and contain at least one value greater than or equal to 3. For example, the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction can be {3, 4} or {2, 3}.

[0086] In some embodiments, the first type of rank constraint can be implemented using a bitmap. For example, suppose the bitmap is α. R α R-1 ...α1, α0, where α i =0 indicates that the reported RI cannot be layer i+1.

[0087] Similar to the first type of rank restriction, the second type of rank restriction indication can also be implemented using a bitmap, which will not be elaborated here.

[0088] 12) Third type of rank constraint, which is used to indicate the optional value of the RI and the optional value of the number of layers corresponding to the PMI.

[0089] Optionally, when the optional values ​​of the RI and the number of layers corresponding to the PMI are indicated by the third type of rank constraint, the number of layers corresponding to the PMI included in the CSI report can be the maximum value among the optional values ​​indicated by the third type of rank constraint; or, the number of layers corresponding to the PMI included in the CSI report can be the maximum value among the optional values ​​indicated by the third type of rank constraint that is not greater than the rank of the channel matrix. This allows the number of layers corresponding to the PMI reported by the terminal in the CSI report to be greater than or equal to the number of layers indicated by the RI, thereby providing more information for the PMI inference process of the network-side equipment.

[0090] Similar to the first type of rank constraint, the third type of rank constraint can also be implemented using a bitmap, which will not be elaborated here.

[0091] In some embodiments, the terminal may obtain the reported configuration information in ways including but not limited to: configuration by the network-side device, protocol agreement, higher-layer configuration, etc.

[0092] S2102, the terminal determines the CSI report based on the reported configuration information.

[0093] When the terminal determines the CSI report based on the reported configuration information, it may determine the RI based on the first type of rank restriction, and determine the first information based on the second type of rank restriction, or determine the RI and the first information based on the third type of rank restriction, etc. There are no restrictions here.

[0094] However, it is worth noting that in the CSI report determined by the terminal based on the first type of rank restriction and the second type of rank restriction, or in the CSI report determined by the terminal based on the third type of rank indication, the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI, thereby providing more information for the PMI inference process of the network-side device and improving the accuracy of the PMI inference process of the network-side device.

[0095] In some embodiments, in addition to the aforementioned first type of rank restriction, second type of rank restriction, and third type of rank restriction, the reported configuration information may also include or indicate at least one of the following 21)-23).

[0096] 21) Power offset, used by the terminal to determine the Channel Quality Indicator (CQI) at the corresponding transmit power.

[0097] For example, the terminal can determine the energy per resource element (EPRE) of the PDSCH required by CQI based on the power offset and the power control offset in the reference resource configuration associated with the reported configuration information. The ratio of the EPRE of the PDSCH to the EPRE of the reference signal is (power control offset - power offset).

[0098] 22) Antenna port subset, also known as antenna port off pattern, antenna port pattern, or antenna port number pattern, etc., is used to indicate which ports in the reference signal the terminal measures and provides feedback on.

[0099] In this embodiment, the subset of antenna ports can be indicated by a bitmap or other means, wherein each bit in the bitmap corresponds to one antenna port.

[0100] Optionally, the antenna ports in the subset of antenna ports can be arranged in the order of first dimension, then second dimension, and finally polarization direction, or they can be arranged in the order of second dimension, then first dimension, and finally polarization direction; there is no limitation on this. The first dimension can be, but is not limited to, a horizontal dimension, and the second dimension can be, but is not limited to, a vertical dimension.

[0101] 23) At least one reporting sub-configuration (ReportSubConfig).

[0102] Each of the reporting sub-configurations indicates or corresponds to a different subset of the antenna ports. That is, each of the reporting sub-configurations can indicate a subset of the antenna ports for CSI feedback, thereby enabling the network-side device to determine which ports to shut down and which appropriate precoding to use for data transmission after shutting down the ports based on the CSI corresponding to the different antenna port subsets.

[0103] And / or, each of the reporting sub-configurations indicates or corresponds to a different power offset, i.e., each of the reporting sub-configurations can indicate a power offset for CSI feedback.

[0104] For the aforementioned 21)-23), it can be understood that if the reported configuration information includes or indicates power offset, antenna port subset, but does not include reported sub-configuration, it means that a reported configuration or an antenna port subset has been configured or agreed upon, and there is no need to divide the sub-configuration information.

[0105] If the reported configuration information includes power offset, antenna port subset, and at least one reported sub-configuration, it means that the power offset and / or antenna port subset included in the reported configuration information are configured in each of the reported sub-configurations, that is, each reported sub-configuration includes the power offset and / or antenna port subset.

[0106] Based on this, in some embodiments, if the reporting configuration information includes or indicates the at least one reporting sub-configuration, the reporting sub-configuration may satisfy, but is not limited to, at least one of the following 31)-32).

[0107] 31) Each of the reporting sub-configurations corresponds to a different first type of rank restriction, that is, each of the reporting sub-configurations can have one first type of rank restriction. Alternatively, different reporting sub-configurations may correspond to the same first type of rank restriction, that is, each of the reporting sub-configurations may share one first type of rank restriction.

[0108] 32) Different reporting sub-configurations correspond to the same second type of rank constraint. That is, for different reporting sub-configurations, this embodiment only configures one second type of rank constraint to indicate the optional value of the number of layers corresponding to the PMI.

[0109] Based on this, in some embodiments, depending on the different reported configuration information, the CSI report determined by the terminal based on S2102 can satisfy at least one of the following conditions 1-3.

[0110] Scenario 1: If the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information, which includes one RI, one PMI, and at least one CQI. That is, the CSI report includes one RI, one PMI, and at least one CQI.

[0111] Understandably, compared to the problem of high reporting overhead in related technologies where multiple different PMIs need to be fed back for different antenna port subsets in order to facilitate network-side devices in determining precoding under different antenna port patterns, in this embodiment, the terminal only needs to feed back one PMI under one antenna port pattern (such as the entire set of antenna ports or a subset of antenna ports), so that the network-side devices can perform inference of other PMIs (such as PMIs corresponding to other antenna port subsets that have not been reported) based on the one PMI, which can significantly reduce the PMI reporting overhead.

[0112] Furthermore, since the number of layers of PMI in the CSI report reported by the terminal can be greater than the number of layers indicated by RI, it can provide more information for the PMI inference process of the network-side device, making it easier for the network-side device to perform CSI (such as PMI) inference based on methods such as single-end AI models, and ensuring the accuracy of PMI inference results. For example, the network-side device can infer the PMI corresponding to a large number of ports based on the PMI corresponding to a small number of ports pattern.

[0113] In some embodiments, the CQI may be determined based on part or all of the first L layers of precoding in the precoding matrix corresponding to the PMI, wherein L is indicated by the RI and L is greater than or equal to 1.

[0114] For example, suppose the PMI fed back in a certain frequency domain unit is W, and its dimension is N. t ×L PMI , where N t L represents the number of antenna ports. PMI Given the layer number corresponding to PMI, the terminal can calculate the CQI based on some or all of W(:,1),...,W(:,L), where W(:,i) represents the i-th column of W. L is indicated by the RI.

[0115] At this time, since the RI indicates the L, and the number of layers corresponding to the PMI is different from the number of layers indicated by the RI, the terminal needs to indicate the number of layers of the PMI through the first information in Part 1 of the CSI report, so as to assist the base station in determining the overhead of the PMI.

[0116] Scenario 2: If the reported configuration information does not include or indicate at least one reported sub-configuration, but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to at least one of the power offset and the antenna port subset, and the second information includes one RI, one PMI, and at least one CQI. That is, the CSI report includes one RI, one PMI, and at least one CQI corresponding to at least one of the power offset and the antenna port subset.

[0117] Understandably, compared to the problem of high reporting overhead in related technologies where multiple PMIs need to be fed back for different antenna port subsets in order to facilitate network-side devices in determining precoding under different antenna port patterns, in this embodiment, the terminal only needs to feed back one PMI corresponding to at least one of the power offset and the antenna port subset, so that the network-side device can perform inference of other PMIs (such as PMIs corresponding to other antenna port subsets that have not been reported) based on the one PMI, which can significantly reduce CSI reporting overhead.

[0118] Furthermore, since the number of layers of PMI in the CSI report reported by the terminal can be greater than the number of layers indicated by RI, it can provide more information for the PMI inference process of the network-side device, making it easier for the network-side device to perform CSI (such as PMI) inference based on methods such as single-end AI models, and ensuring the accuracy of PMI inference results. For example, the network-side device can infer the PMI corresponding to a large number of ports based on the PMI corresponding to a small number of ports pattern.

[0119] The calculation of the CQI can be referred to the relevant description in Case 1, and will not be repeated here.

[0120] Scenario 3: When the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, which corresponds to the first reported sub-configuration among the at least one reported sub-configuration, and the second information includes one RI, one PMI, and at least one CQI. That is, the CSI report includes one RI, one PMI, and at least one CQI corresponding to the first reported sub-configuration.

[0121] Understandably, compared to the problem of high reporting overhead caused by the need to feed back multiple PMIs for different reporting sub-configurations in order to facilitate network-side devices in determining precoding under different antenna port patterns in related technologies, in this embodiment, the terminal only needs to feed back one PMI corresponding to the first reporting sub-configuration, so that the network-side device can perform PMI inference for other reporting sub-configurations based on the one PMI, which can significantly reduce CSI reporting overhead.

[0122] Furthermore, since the number of layers of PMI in the CSI report reported by the terminal can be greater than the number of layers indicated by RI, it can provide more information for the PMI inference process of the network-side device, making it easier for the network-side device to perform CSI (such as PMI) inference based on methods such as single-end AI models, and ensuring the accuracy of PMI inference results. For example, the network-side device can infer the PMI corresponding to a large number of ports based on the PMI corresponding to a small number of ports pattern.

[0123] Optionally, the first reporting sub-configuration may satisfy at least one of the following 51)-54).

[0124] 51) The first reporting sub-configuration is indicated by the network-side device.

[0125] For example, assuming that the network-side device indicates a set of sub-configurations in at least one reported sub-configuration included or indicated in the reported configuration information in a semi-static manner (such as Radio Resource Control (RRC)), then the first reported sub-configuration may belong to the set of sub-configurations.

[0126] Optionally, the network-side device may further indicate the first reporting sub-configuration in the sub-configuration set through other signaling.

[0127] For example, the first reporting sub-configuration may also be the reporting sub-configuration indicated by the network-side device in the reporting configuration information via signaling.

[0128] The signaling may be, but is not limited to, one or more of RRC, Medium Access Control Element (MAC CE), and Downlink Control Information (DCI). Optionally, in the case where the signaling is MAC CE and DCI, the network-side device may first indicate one or more third reporting sub-configurations from at least one reporting sub-configuration included or indicated in the reporting configuration information via MAC CE, and then indicate the first reporting sub-configuration from among the indicated multiple third reporting sub-configurations via DCI.

[0129] It should be noted that when the reported configuration information includes or indicates only one reported sub - configuration, this reported sub - configuration is the first reported sub - configuration, and in this case, no additional indication from the network - side device is required.

[0130] 52) The number of antenna ports in the antenna port subset corresponding to the first reported sub - configuration is the smallest among the antenna port subsets corresponding to each of the reported sub - configurations included in the first set. The first set is a subset of the at least one reported sub - configuration, that is, the first set is a set composed of some or all of all the reported sub - configurations included or indicated in the reported configuration information.

[0131] For example, assume that the first set includes reported sub - configuration A1, reported sub - configuration A2, and reported sub - configuration A3. Among them, the number of antenna ports corresponding to reported sub - configuration A1 is B1, the number of antenna ports corresponding to reported sub - configuration A2 is B2, and the number of antenna ports corresponding to reported sub - configuration A3 is B3, and B1 < B2 < B3. Then, the first reported sub - configuration is reported sub - configuration A1.

[0132] Optionally, the first set mentioned in the context of this application can be implemented by means such as protocol agreement, high - layer configuration, or indication from the network - side device, and no limitation is made here.

[0133] 53) The first reported sub - configuration is the reported sub - configuration with a specific identifier in the first set.

[0134] Among them, the specific identifier can be the reported sub - configuration with the smallest identifier or the largest identifier in the first set, or an identifier agreed by the protocol or configured by the network - side, and no limitation is made here.

[0135] Optionally, the identifier of the reported sub - configuration can be the configuration order of the reported sub - configuration or the index of the reported sub - configuration, etc. Among them, for the configuration order, the configuration order of the first - configured reported sub - configuration is 1, the configuration order of the second - configured reported sub - configuration is 2, and so on.

[0136] 54) The first reported sub - configuration is determined by the terminal based on the first set.

[0137] For example, the terminal can determine the full set of antenna ports and the specific RI corresponding to a power offset of 0 dB according to the second - type rank restriction. Then, the terminal selects the reported sub - configuration in the first set whose channel matrix rank is closest to the specific RI as the first reported sub - configuration.

[0138] Optionally, when the terminal determines the first reporting sub-configuration, the terminal needs to indicate the first reporting sub-configuration to the network-side device. For example, the terminal can indicate the identifier of the first reporting sub-configuration or the relative sequence number of the first reporting sub-configuration in the first set. This ensures that the network-side device and the terminal have a consistent understanding of the first reporting sub-configuration, thereby ensuring the accuracy of subsequent PMI inference and other processes.

[0139] It is worth noting that in this embodiment, considering that the number of ports in the antenna port subset configured in the reported configuration information may be smaller than the actual number of antenna ports used by the network-side device, or that the rank of the channel matrix when the number of ports in the configured antenna port subset is smaller may be smaller than the rank of the channel matrix when the number of antenna ports used by the network-side device is larger (e.g., the rank of the channel matrix for 8 ports is 2, and the RI corresponding to the 64-port array is 4), it would be difficult to infer the PMI corresponding to a larger number of ports (e.g., 64) based on the PMI corresponding to a smaller number of ports (e.g., 8). Therefore, in scenario 3, multiple reporting sub-configurations can be configured in the reported configuration information. The terminal can select a suitable first reporting sub-configuration from them, so that the rank of the channel matrix corresponding to the first reporting sub-configuration can be the same as the RI under the full set of antenna ports (total number of antenna ports), which is beneficial for the inference of CSI such as PMI.

[0140] In some embodiments, the calculation of the CQI in Situation 3 can be referred to the relevant description in Situation 1, and will not be repeated here.

[0141] In some embodiments, for case 3, where the reported configuration information includes or indicates multiple reported sub-configurations, the CSI report may also include at least one of the RI corresponding to the second reported sub-configuration and at least one CQI corresponding to the second reported sub-configuration.

[0142] The second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration, such as other reporting sub-configurations besides the first reporting sub-configuration in the first set.

[0143] In other words, in addition to reporting one RI, one PMI, and at least one CQI corresponding to the first reporting sub-configuration, this embodiment can also additionally feed back one or more RIs and / or at least one CQI corresponding to the second reporting sub-configuration. This allows the network-side device to obtain more accurate RI or CQI information to assist it in determining the precoding matrix used for data transmission and time-frequency resource scheduling.

[0144] In addition, since the reporting overhead of RI and CQI is very small, by feeding back one or more second reporting sub-configurations corresponding to RI and / or at least one CQI in the CSI report, the network-side device can obtain more accurate RI or CQI information with only a small increase in reporting overhead. This makes it easier for the network-side device to determine the precoding matrix used for data transmission and time-frequency resource scheduling.

[0145] It is understood that in the above three scenarios, the CSI report includes second information, which includes one RI, one PMI, and at least one CQI. It can also be understood that the CSI report directly includes one RI, one PMI, and at least one CQI.

[0146] In some embodiments, the CSI report may also include a specific CQI in addition to the at least one CQI, wherein the specific CQI satisfies at least one of the following 61)-62).

[0147] 61) The specific CQI corresponds to the other optional values ​​of the RI, except for the first optional value, and the first optional value corresponds to the at least one CQI.

[0148] For example, for scenarios 1-3 above, assuming the selectable values ​​of the RI for the first type of rank restriction indication are {A1, A2, A3}, and the RI corresponding to at least one CQI included in the aforementioned CSI report is A2, then the RI corresponding to the specific CQI included in the CSI report can be at least one of A1 and A3, that is, the specific CQI in the CSI report is the CQI corresponding to at least one of A1 and A3.

[0149] 62) The specific CQI corresponds to the other optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0150] For example, for the aforementioned scenarios 1-3, assuming that the selectable values ​​for the number of layers corresponding to the PMI of the second type of rank restriction indication are {B1, B2, B3}, and the number of layers corresponding to the PMI of at least one CQI included in the aforementioned CSI report is B1, then the number of layers corresponding to the PMI of a specific CQI included in the CSI report can be at least one of B2 and B3.

[0151] It is worth noting that for the same number of transmission layers, there is a strong positive correlation between CQI and beamforming gain. Therefore, the CQI of different precoding methods (including different port patterns) can be inferred from each other using the beamforming gains corresponding to those precoding methods. However, for different numbers of transmission layers, since the total power remains constant, changes in the number of transmission layers will lead to changes in the power of each transmission layer. Thus, adding a transmission layer with a strong beamforming gain may increase the CQI, but adding a transmission layer with a weak beamforming gain may actually decrease the CQI. Therefore, if both changes in precoding and the number of transmission layers are considered simultaneously, the variation pattern of CQI is difficult to characterize, making inference quite challenging.

[0152] In this case, by further carrying the specific CQI in the CSI report, the network-side device can obtain the CQI corresponding to different transport layers under a certain port pattern. Then, it only needs to infer the CQI of different port patterns (which can be regarded as different precoding) under the same transport layer, which can improve the inference performance and help the network-side device better determine the precoding matrix and time-frequency resource scheduling used for data transmission.

[0153] In some embodiments, considering that the path-related parameters of the channel (e.g., delay, angle, etc.) change slowly over time in the propagation environment, the PMIs corresponding to adjacent moments have a certain correlation. Based on this, related technologies can consider using PMIs at different moments to further improve the accuracy of PMI inference. Simultaneously, to obtain the most information, multiple PMIs corresponding to different antenna port subsets at different moments can be reported. Furthermore, considering feedback overhead, the aforementioned different moments need to be separated by a certain time interval, such as several time slots. However, in the aforementioned related technologies, if it is necessary to report multiple PMIs corresponding to different moments based on aperiodic CSI and aperiodic reference signals, and different reporting sub-configurations are required for each moment, then a separate triggering state needs to be configured for each antenna port subset (or antenna port pattern). This not only limits the number of triggering state configurations but also requires multiple triggering messages to trigger the reporting of multiple aperiodic CSIs, leading to problems such as high triggering overhead.

[0154] In this embodiment, for the case where the CSI (or CSI report) is a non-periodic CSI, a CSI reporting scheme is provided. That is, the process of the terminal determining the CSI report described in S210 above may include, but is not limited to, S2103-S2104 shown in Figure 3b, as follows.

[0155] S2103, the terminal receives first indication information from the network-side device.

[0156] The first indication information may be, but is not limited to, DCI, etc.

[0157] S2104, the terminal determines the CSI report based on the first indication information.

[0158] The first indication information is used to trigger the reporting of N aperiodic CSIs. The N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information. N is an integer greater than 1.

[0159] In other words, in this embodiment, for N non-periodic CSIs that need to be reported at different times and are associated with the same reporting configuration information, a single trigger signaling (i.e., the first indication information, corresponding to a trigger state) can be used to achieve the reporting of N non-periodic CSIs at different times, thereby significantly reducing triggering overhead and saving communication resources. The aforementioned N non-periodic CSIs can be associated with different reporting sub-configurations.

[0160] It is worth noting that the case where the first indication information triggers the reporting of N non-periodic CSIs can also be understood as N non-periodic CSI feedbacks being associated with one trigger state triggered by the first indication information, and the N non-periodic CSIs being associated with different reporting sub-configurations. That is, in this embodiment, N non-periodic CSIs at different times can be reported by one trigger signaling (i.e., the first indication information, corresponding to one trigger state), and the N non-periodic reported CSIs are associated with different reporting sub-configurations, without the need to configure trigger states separately for the non-periodic reporting of CSIs corresponding to different reporting sub-configurations as in related technologies. This solves the problem of the limited number of trigger state configurations in related technologies.

[0161] Optionally, the reference signals associated with the N aperiodic CSIs are located in different time units (such as time slots, frames, etc.). This can be understood as follows: in this embodiment, a single trigger signal (i.e., the first indication information, corresponding to a trigger state) can be used to achieve the reporting of N aperiodic CSIs at different times. Furthermore, the N aperiodic CSIs are associated with reference signals in different time units and different reporting sub-configurations. In other words, in this embodiment, it is not necessary to configure trigger states separately for the aperiodic reporting of reference signals in different time units and CSIs associated with different reporting sub-configurations, as is required in related technologies. This solves the problem of the limited number of trigger state configurations in related technologies.

[0162] In one embodiment, each of the aperiodic CSIs is associated with a second set, wherein the second set is a subset of at least one reporting sub-configuration included in the reporting configuration information, i.e., the second set includes at least a portion of the at least one reporting sub-configuration.

[0163] Optionally, there are multiple ways to obtain the N second sets that are associated one-to-one with the N aperiodic CSIs. For example, the network-side device can configure the N second sets in a semi-static manner, such as through RRC configuration.

[0164] For example, the network-side device can first configure multiple third sets in a semi-static manner, with each third set including the N second sets. Then, the network-side device can use the first indication information to indicate one of the multiple third sets as the N second sets.

[0165] For example, the network-side device can first configure multiple possible third sets in a semi-static manner, then activate M of the multiple third sets through MAC CE, and finally, the network-side device uses the first indication information to indicate one of the activated M third sets as the N second sets.

[0166] Optionally, a second set can be indicated by a network-side device using a bitmap of length M, where M is the total number of all reported sub-configurations configured in the reported configuration information. Alternatively, a second set can be indicated by an index or a combination number, where the index can be an identifier of a reported sub-configuration configured in the reported configuration information or a relative sequence number among all reported sub-configurations configured in the reported configuration information.

[0167] For example, in the case where the index is the relative sequence number among all the reporting sub-configurations configured in the reporting configuration information, it is assumed that the reporting configuration information includes {reporting sub-configuration A, reporting sub-configuration B}, and the relative sequence numbers of reporting sub-configuration A and reporting sub-configuration B are 0 and 1, respectively.

[0168] In some embodiments, for the aforementioned case of N second sets associated one-to-one with N of the aperiodic CSIs, the association between the aperiodic CSIs and the second sets is determined according to at least one of the following 71)-72).

[0169] 71) Indication sequence of uplink resources. The uplink resources are used for reporting the aperiodic CSI.

[0170] For example, the first configuration of the second set corresponds to the indicated first uplink resource, the second configuration of the second set corresponds to the indicated second uplink resource, and so on.

[0171] 72) Transmission time of uplink resources. The uplink resources are used for reporting the aperiodic CSI.

[0172] For example, the first configuration of the second set corresponds to the uplink resources indicated at the first transmission time, the second configuration of the second set corresponds to the uplink resources indicated at the second transmission time, and so on.

[0173] In some embodiments, when there are N uplink resources and the uplink resources are PUSCHs, the N uplink resources correspond to the same start and length indicator value (SLIV). In this case, for the N PUSCHs, only N slot positions need to be indicated, thereby saving resource indication overhead.

[0174] Alternatively, if there are N uplink resources, and the uplink resources are PUCCHs, the time-frequency resource positions of the N uplink resources are the same within a time-domain unit (such as a timeslot). In this case, for the transmission of N aperiodic CSIs based on the N PUCCHs, only the positions of the N timeslots need to be indicated, thereby saving resource indication overhead.

[0175] In some embodiments, the first indication information described above may also be used to indicate at least one of the following 81)-83).

[0176] 81) The reporting sub-configuration associated with each of the aperiodic CSIs, such as which or several reporting sub-configurations are associated with each of the aperiodic CSIs.

[0177] In this context, when instructing the reporting sub-configuration associated with each of the aperiodic CSIs through the first instruction information, an implicit instruction method may be used, and there are no restrictions on this.

[0178] 82) Used to carry uplink resource configuration information corresponding to each of the aforementioned aperiodic CSIs, such as time and frequency resource information.

[0179] 83) Reference signals used for N aperiodic CSI measurements. The aperiodic CSI is used for channel estimation, or the reference signals are used for channel measurement. In this embodiment, the reference signal resource configuration corresponding to the reference signals may include, but is not limited to: time slot position, time-frequency position within the time slot, and occupied frequency band size.

[0180] In some embodiments, in addition to the aforementioned first indication information being used to trigger the reporting of N aperiodic CSIs, if the first indication information is used to trigger the reporting of 1 (i.e., N=1) aperiodic CSIs, then the first indication information may also include a third piece of information to indicate which one or more reporting sub-configurations are associated with the triggered aperiodic CSI.

[0181] Optionally, the third information may include, but is not limited to: bitmap, number of combinations, index of the reporting sub-configuration associated with the aperiodic CSI, etc.

[0182] The index of the reporting sub-configuration may be, but is not limited to, the identifier of the reporting sub-configuration, or the relative sequence number of the reporting sub-configuration among all reporting sub-configurations in the reporting configuration information.

[0183] For example, in the case where the index is the relative sequence number of the reporting sub-configuration in the reporting configuration information, assuming that the reporting configuration information includes {reporting sub-configuration A, reporting sub-configuration B}, the relative sequence numbers of reporting sub-configuration A and reporting sub-configuration B can be 0 and 1 respectively.

[0184] In the case where the third information is a bitmap, each bit corresponds to a reporting sub-configuration in the reporting configuration information.

[0185] In some embodiments, for the aperiodic CSI, if a trigger state triggered by the first indication information including the third information is associated with at most S aperiodic CSI feedbacks, then S is less than H, where H is the maximum number of aperiodic CSIs that can be associated with a single trigger state triggered by the first indication information excluding the third information. Thus, the carrying of the third information can be achieved without increasing the overhead of the first indication information.

[0186] In some embodiments, for a non-periodic CSI that can be associated with one or more reporting sub-configurations, the one or more reporting sub-configurations can also be understood as the reporting sub-configurations included in the aforementioned first set.

[0187] Based on this, in some embodiments, for each CSI report corresponding to the non-periodic CSI, the RI, CQI, and PMI included in the CSI report can refer to the relevant descriptions in the foregoing embodiments and achieve the same or corresponding technical effects, which will not be repeated here. For example, the RI, CQI, and PMI included in the CSI report can be determined according to the aforementioned first-type rank restriction and second-type rank restriction, or the RI, CQI, and PMI included in the CSI report can be determined according to the aforementioned third-type rank restriction, etc., which will not be repeated here.

[0188] In some embodiments, considering that the path parameters of the channel (e.g., delay, angle, etc.) change slowly over time in the propagation environment, PMIs at adjacent reporting times have a certain correlation. Based on this, related technologies can consider PMIs at different times to further improve the accuracy of PMI inference. Furthermore, to obtain the maximum information, it is possible to consider reporting PMIs corresponding to different antenna port subsets at different times. In addition, considering feedback overhead, the aforementioned different times need to be separated by a certain time interval, such as at least one time slot. However, in the aforementioned related technologies, if it is necessary to report PMIs corresponding to multiple different time units (e.g., time slots) based on semi-persistent CSI, and different reporting sub-configurations are required for each time, a trigger state needs to be configured separately for each antenna port subset (or antenna port pattern). This not only limits the number of trigger state configurations but also requires multiple activation messages to activate multiple semi-persistent CSI reports, resulting in high activation overhead.

[0189] In this embodiment, for the case where the CSI (or CSI report) is a semi-continuous CSI, a CSI reporting scheme is provided. That is, the process of the terminal determining the CSI report in S210 can also include S2105-S2106 as shown in Figure 3c, the contents of which are as follows.

[0190] S2105, the terminal receives second instruction information from the network-side device.

[0191] The second indication information can be one or more of MAC CE, DCI, etc., and there is no limitation here.

[0192] S2106, the terminal determines the CSI report based on the second instruction information.

[0193] The second indication information is used to activate the reporting of the semi-persistent CSI. Simultaneously, the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration. Optionally, the target configuration usage order can be implemented by protocol agreement or network-side device configuration, etc., and is not limited here.

[0194] It is understood that in this embodiment, by activating a semi-persistent CSI reporting method, the purpose of reporting CSI corresponding to different antenna port subsets at different reporting times is achieved, thereby reducing the activation overhead of semi-persistent CSI reporting and saving communication resources.

[0195] Furthermore, in the case where the second indication information indicates the order of use of the target configuration, it can also be understood as activating a trigger state through one second indication information, and the trigger state is associated with the reporting of multiple semi-persistent CSIs corresponding to different reporting sub-configurations. That is, the embodiment provided activates the reporting of multiple semi-persistent CSIs at different reporting times through one activation signaling (i.e., the first indication information, corresponding to one trigger state). These semi-persistently reported CSIs are associated with reference signals on different time units (such as time slots) and different reporting sub-configurations. Therefore, it is not necessary to configure trigger states separately for the non-persistent reporting of reference signals on different time units and CSIs corresponding to different reporting sub-configurations, as in the related technologies, thus solving the problem of the limited number of trigger states that exist in the related technologies.

[0196] For example, suppose the reported configuration information includes three reporting sub-configurations, such as reporting sub-configuration A, reporting sub-configuration B, and reporting sub-configuration C, and two configuration usage orders are configured based on reporting sub-configurations A, B, and C: {reporting sub-configuration A, reporting sub-configuration B, reporting sub-configuration C} and {reporting sub-configuration B, reporting sub-configuration A, reporting sub-configuration C}. Then, when the network-side device triggers semi-persistent CSI reporting through the second indication information, it can also indicate that the target configuration usage order is either {reporting sub-configuration A, reporting sub-configuration B, reporting sub-configuration C} or {reporting sub-configuration B, reporting sub-configuration A, reporting sub-configuration C}.

[0197] Assuming the target configuration is used in the order of {reporting sub-configuration A, reporting sub-configuration B, reporting sub-configuration C}, then the CSI report at the first reporting time (i.e., the semi-persistent CSI activated by the second indication information) is associated with reporting sub-configuration A, the CSI report at the first reporting time is associated with reporting sub-configuration B, the CSI report at the second reporting time is associated with reporting sub-configuration C, the CSI report at the third reporting time is associated with reporting sub-configuration A, and so on.

[0198] In some embodiments, the reporting sub-configuration associated with the semi-persistent CSI reported at each reporting time can be one or more of the aforementioned ones, without limitation.

[0199] The determination method for the RI, CQI, and PMI included in the CSI report corresponding to each reporting time for the semi-persistent CSI can refer to the relevant descriptions in the foregoing embodiments, achieving the same or corresponding technical effects, and will not be repeated here. For example, the RI, CQI, and PMI included in the CSI report can be determined according to the aforementioned first-type rank restriction and second-type rank restriction, or the RI, CQI, and PMI included in the CSI report can be determined according to the aforementioned third-type rank restriction, etc., and will not be repeated here.

[0200] It is worth noting that the reporting sub-configuration associated with each reporting time can be understood as the reporting sub-configuration included in the aforementioned first set, that is, each reporting time is associated with a first set.

[0201] Based on the description of the aforementioned method embodiment 200, the CSI reporting process provided in this application will be explained below with reference to examples.

[0202] Example 1

[0203] Assuming that the first type of rank constraint indicates the possible values ​​of RI, and the second type of rank constraint indicates the possible values ​​of the number of layers corresponding to PMI, then, as shown in Figure 4a, the reporting process of CSI is as follows.

[0204] S411, the network-side device sends configuration information to the terminal, such as CSI report configuration (CSI-ReportConfig) or codebook configuration (CodebookConfig).

[0205] The reported configuration information may include, but is not limited to, at least one of the following a)-d).

[0206] a) First-class rank restriction and second-class rank restriction.

[0207] b) Power offset.

[0208] c) Antenna port subset.

[0209] d) At least one reporting sub-configuration.

[0210] It is understood that the description of each piece of information in a)-d) can be referred to the relevant description in the aforementioned method embodiment 200, and will not be repeated here.

[0211] In addition, it is worth noting that, besides the reported configuration information, the network-side device can also configure reference signal resources, etc.

[0212] S412, the terminal performs measurements on the reference signal resources configured thereon and determines a CSI report based on the reported configuration information.

[0213] Scenario 1: If the reported configuration information includes a first type of rank limit and a second type of rank limit, but does not include or indicates power offset, antenna port subset, and at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI is determined based on the optional value of the RI indicated by the first type of rank limit, the first information is determined based on the optional value of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0214] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0215] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0216] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0217] Scenario 2: If the reported configuration information includes or indicates a first type of rank limit, a second type of rank limit, a power offset, and an antenna port subset, but does not include or indicate at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI, the one PMI, and the at least one CQI correspond to the power offset and the antenna port subset, and the one RI is determined based on the optional value of the RI indicated by the first type of rank limit, the first information is determined based on the optional value of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0218] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0219] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0220] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0221] Scenario 3: If the reported configuration information includes or indicates a first type of rank restriction, a second type of rank restriction, or at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI, the one PMI, and the at least one CQI correspond to the first reported sub-configuration in the at least one reported sub-configuration, and the one RI is determined based on the optional value of the RI indicated by the first type of rank restriction, the first information is determined based on the optional value of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0222] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0223] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0224] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0225] Optionally, the CSI report may also include the RI corresponding to the second reporting sub-configuration, at least one CQI, etc., to provide more information to the network-side device to determine the precoding or time-frequency resource scheduling used by the data channel.

[0226] S413, the terminal sends a CSI report to the network-side device.

[0227] S414, the network-side device performs CSI inference based on the CSI report, such as PMI inference and channel quality assessment.

[0228] In Example 1, compared to the problem of high reporting overhead in related technologies where multiple PMIs need to be fed back for different reporting sub-configurations, in this embodiment, the terminal only needs to feed back one PMI corresponding to the first reporting sub-configuration or the antenna port subset, so that the network-side device can perform PMI inference for other reporting sub-configurations based on the one PMI, which can significantly reduce CSI reporting overhead.

[0229] Furthermore, since the number of layers of PMI in the CSI report reported by the terminal can be greater than the number of layers indicated by RI, it can provide more information for the PMI inference process of the network-side device, facilitate the CSI inference of the single-end AI model on the network-side device, and ensure the accuracy of the PMI inference results. For example, it can enable the network-side device to infer the PMI corresponding to the large port number pattern based on the PMI corresponding to the small port number pattern.

[0230] Example 2

[0231] Assuming that the optional values ​​of RI and the optional values ​​of the number of layers corresponding to PMI are indicated by the third type of rank constraint, then, as shown in Figure 4b, the reporting process of CSI is as follows.

[0232] S421, the network-side device sends configuration information, such as CSI-ReportConfig or CodebookConfig, to the terminal.

[0233] The reported configuration information may include, but is not limited to, at least one of the following a)-d).

[0234] a) Third type of rank restriction.

[0235] b) Power offset.

[0236] c) Antenna port subset.

[0237] d) At least one reporting sub-configuration.

[0238] It is understood that the description of each piece of information in a)-d) can be referred to the relevant description in the aforementioned method embodiment 200, and will not be repeated here.

[0239] In addition, it is worth noting that, besides the reported configuration information, the network-side device can also configure reference signal resources, etc.

[0240] S422, the terminal performs measurements on the reference signal resources configured thereon and determines a CSI report based on the reported configuration information.

[0241] Scenario 1: If the reported configuration information includes a third-order rank limit but does not include or indicates power offset, antenna port subset, or at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI is determined based on an optional value of the RI indicated by the third-order rank limit, the first information is determined based on an optional value of the number of layers corresponding to the PMI indicated by the third-order rank limit, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0242] Optionally, the number of layers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit that is not greater than the rank of the channel matrix.

[0243] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0244] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0245] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0246] Scenario 2: If the reported configuration information includes or indicates a third-order rank limit, power offset, and antenna port subset, but does not include or indicate at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI, one PMI, and at least one CQI correspond to the power offset and the antenna port subset, and the one RI is determined based on the optional value of the RI indicated by the third-order rank limit, the first information is determined based on the optional value of the number of layers corresponding to the PMI indicated by the third-order rank limit, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0247] Optionally, the number of layers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit that is not greater than the rank of the channel matrix.

[0248] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0249] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0250] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0251] Scenario 3: If the reported configuration information includes or indicates a third-order rank limit, power offset, antenna port subset, or at least one reported sub-configuration, then the CSI report includes first information, an RI, a PMI, and at least one CQI, wherein the one RI, one PMI, and at least one CQI correspond to the first reported sub-configuration in the at least one reported sub-configuration, and the one RI is determined based on the optional value of the RI indicated by the third-order rank limit, the first information is determined based on the optional value of the number of layers corresponding to the PMI indicated by the third-order rank limit, and the number of layers corresponding to the PMI indicated by the first information is greater than or equal to the number of layers indicated by the RI.

[0252] Optionally, the number of layers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit that is not greater than the rank of the channel matrix.

[0253] Optionally, the at least one CQI is determined based on the first L layers in the precoding matrix indicated by the one PMI, and the one RI is used to indicate the L.

[0254] Optionally, the CSI report may also include specific CQIs other than the at least one CQI, and the specific CQIs correspond to other optional values ​​of the RI other than the first optional value, where the first optional value corresponds to the at least one CQI.

[0255] Optionally, the specific CQI corresponds to other optional values ​​among the optional values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

[0256] Optionally, the CSI report may also include the RI corresponding to the second reporting sub-configuration, at least one CQI, etc., to provide more information to the network-side device to determine the precoding or time-frequency resource scheduling used by the data channel.

[0257] S423, the terminal sends a CSI report to the network-side device.

[0258] S424, the network-side device performs CSI inference based on the CSI report, such as PMI inference and channel quality assessment.

[0259] In Example 2, compared to the problem of high reporting overhead in related technologies where multiple PMIs need to be fed back for different reporting sub-configurations, in Example 2, the terminal only needs to feed back one PMI corresponding to the first reporting sub-configuration or the antenna port subset, so that the network-side device can perform PMI inference for other reporting sub-configurations based on the one PMI, which can significantly reduce CSI reporting overhead.

[0260] Furthermore, since the number of layers of PMI in the CSI report reported by the terminal can be greater than the number of layers indicated by RI, it can provide more information for the PMI inference process of the network-side device, facilitate the CSI inference of the single-end AI model on the network-side device, and ensure the accuracy of the PMI inference results. For example, it can enable the network-side device to infer the PMI corresponding to the large port number pattern based on the PMI corresponding to the small port number pattern.

[0261] Example 3

[0262] Assuming the CSI is a non-periodic CSI, the CSI reporting process provided in this example is as follows, as shown in Figure 4c.

[0263] S431, the network-side device sends the first instruction information to the terminal.

[0264] The first indication information is used to trigger the reporting of N aperiodic CSIs. The N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information. N is an integer greater than 1.

[0265] Optionally, the N reference signals associated with the aperiodic CSI are located in different time units (such as time slots, frames, etc.).

[0266] S432, the terminal determines the CSI report based on the first indication information.

[0267] Optionally, when the terminal determines that it needs to report non-periodic CSI based on the first indication information, it can determine the CSI report according to the CSI report determination method provided in Example 1 or Example 2, such that the CSI report includes an RI, a PMI, at least one CQI, etc.

[0268] S433, the terminal sends a CSI report to the network-side device.

[0269] S434, the network-side device performs CSI inference based on the CSI report, such as PMI inference and channel quality assessment.

[0270] In this Example 3, in addition to achieving the effects shown in Examples 1 and 2, for N different reporting times and reference signals associated with the same reporting configuration information and different time units, the reporting of N different reporting times and reference signals associated with different time units can be achieved through a single trigger signaling (i.e., the first indication information, corresponding to a trigger state), thereby significantly reducing triggering overhead and saving communication resources.

[0271] It is worth noting that the case where the first indication information triggers the reporting of N aperiodic CSIs can also be understood as the first indication information triggering a trigger state that is associated with N aperiodic CSI feedbacks of reference signals associated with different time units. That is, the example provided in Example 3 uses a trigger signal (i.e., the first indication information, corresponding to a trigger state) to achieve the reporting of N aperiodic CSIs at different times. These aperiodic reported CSIs are associated with reference signals at different time units and different reporting sub-configurations. In this way, it is not necessary to configure trigger states separately for the aperiodic reporting of CSIs corresponding to reference signals at different time units and different reporting sub-configurations, thus solving the problem of the limited number of trigger state configurations in related technologies.

[0272] Example 4

[0273] Assuming CSI is semi-persistent, the CSI reporting process provided in this example is as follows, as shown in Figure 4d.

[0274] S441, the network-side device sends a second instruction message to the terminal.

[0275] The second indication information is used to activate the reporting of the semi-persistent CSI. The second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included in the reporting configuration information. Each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0276] S442, the terminal determines the CSI report based on the second instruction information.

[0277] Optionally, when the terminal determines that it needs to report a semi-persistent CSI based on the second indication information, it can determine the CSI report according to the CSI report determination method provided in Example 1 or Example 2, such that the CSI report includes an RI, a PMI, at least one CQI, etc.

[0278] S443, the terminal sends a CSI report to the network-side device.

[0279] S444, the network-side device performs CSI inference based on the CSI report, such as PMI inference and channel quality assessment.

[0280] In this example 4, in addition to achieving the effects shown in examples 1 and 2, it is also possible to achieve the purpose of reporting CSI corresponding to different antenna port sets at different reporting times by activating a semi-persistent CSI reporting method, thereby reducing the activation overhead of semi-persistent CSI reporting and saving communication resources.

[0281] Furthermore, in the case where the second indication information indicates the order of use of the target configuration, it can also be understood as triggering a trigger state through one second indication information, and the trigger state is associated with multiple semi-persistent CSI feedbacks corresponding to different reporting sub-configurations. That is, the example provided in Example 4 uses an activation signal (i.e., the first indication information, corresponding to one trigger state) to achieve the reporting of multiple semi-persistent CSIs at different reporting times. These semi-persistently reported CSIs are associated with reference signals at different time units and different reporting sub-configurations. In this way, it is not necessary to configure trigger states separately for the semi-persistent reporting of reference signals at different time units and CSIs corresponding to different reporting sub-configurations, as in related technologies, thus solving the problem of the limited number of trigger state configurations in related technologies.

[0282] It is worth noting that the implementation process of Examples 1-4 can be referred to the relevant description in the aforementioned method embodiment 200, and will not be repeated here.

[0283] Figure 5 shows a flowchart of a CSI reporting method 500 provided in an exemplary embodiment of this application. This method 500 can be executed by, but is not limited to, a terminal, specifically by hardware and / or software installed in the terminal. In this embodiment, the method 500 may include at least the following steps.

[0284] S510, the terminal receives first instruction information or second instruction information from the network-side device.

[0285] S520, the terminal sends a CSI report to the network-side device according to the first instruction information or the second instruction information.

[0286] The first indication information is used to trigger the reporting of N aperiodic CSIs. These N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information, where N is an integer greater than 1. In other words, for N aperiodic CSIs that need to be reported at different times and are associated with the same reporting configuration information, the reporting of N aperiodic CSIs can be achieved through a single trigger signaling (i.e., the first indication information, corresponding to one trigger state). Since the N aperiodic CSIs are associated with different reporting sub-configurations, triggering overhead can be significantly reduced, communication resources can be saved, and the problem of limited trigger state configurations in related technologies can be avoided.

[0287] Optionally, the reference signals associated with the N aperiodic CSIs are located in different time units (such as time slots, frames, etc.). This can be understood as follows: In this embodiment, a single trigger signal (i.e., the first indication information, corresponding to a trigger state) can be used to achieve the reporting of N aperiodic CSIs at different times, and the N aperiodic reported CSIs are associated with reference signals in different time units and with different reporting sub-configurations. That is, in this embodiment, it is not necessary to configure trigger states separately for the aperiodic reporting of reference signals in different time units and CSIs associated with different reporting sub-configurations, as in related technologies, thus solving the problem of limited number of trigger state configurations in related technologies.

[0288] The second indication information is used to activate the reporting of semi-persistent CSI, and it is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration. In other words, in this embodiment, by activating the reporting of one semi-persistent CSI, CSIs corresponding to different antenna port sets can be reported at different reporting times, reducing the activation overhead of semi-persistent CSI reporting and saving communication resources.

[0289] Furthermore, since the semi-persistent CSIs that need to be reported at different reporting times can be associated with reference signals on different time units and different reporting sub-configurations, this embodiment does not require configuring trigger states separately for the semi-persistent reporting of CSIs corresponding to reference signals on different time units and different reporting sub-configurations, as is the case in related technologies. It also avoids the problem of limited number of trigger state configurations in related technologies.

[0290] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of a plurality of reporting sub-configurations included or indicated in the reporting configuration information.

[0291] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same SLIV; or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit (e.g., a time slot).

[0292] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0293] It is understood that the various implementation methods in this method embodiment 500 can refer to the relevant descriptions in the aforementioned method embodiment 200 to achieve the same or corresponding technical effects. To avoid repetition, they will not be described again here.

[0294] Figure 6 shows a flowchart of a CSI reporting method 600 provided in an exemplary embodiment of this application. This method 600 can be executed by, but is not limited to, a network-side device, specifically by hardware and / or software installed in the network-side device. In this embodiment, the method 600 may include at least the following steps.

[0295] S610, the network-side device receives CSI reports from the terminal.

[0296] The CSI report includes first information and a rank indicator RI. The first information is used to indicate the number of layers corresponding to the precoding matrix indicator PMI included in the CSI report.

[0297] In some embodiments, the network-side device performs target CSI inference based on the CSI report, wherein the target CSI includes PMI, etc.

[0298] In some embodiments, the first information is carried in Part 1 of the CSI report.

[0299] In some embodiments, the method further includes: the network-side device sending reporting configuration information for CSI reporting to the terminal; wherein the CSI report is determined based on the reporting configuration information, and the reporting configuration information includes or indicates any one of the following: a first type of rank restriction and a second type of rank restriction, wherein the first type of rank restriction is used to indicate the optional value of the RI, and the second type of rank restriction is used to indicate the optional value of the number of layers corresponding to the PMI; a third type of rank restriction, wherein the third type of rank restriction is used to indicate the optional value of the RI and the optional value of the number of layers corresponding to the PMI.

[0300] In some embodiments, when the optional value of the RI is indicated by the first type of rank restriction and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank restriction, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction; or, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the maximum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the minimum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction.

[0301] In some embodiments, at least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

[0302] In some embodiments, the reported configuration information further includes or indicates at least one of the following: power offset; a subset of antenna ports; at least one reported sub-configuration, wherein each reported sub-configuration indicates or corresponds to a different subset of antenna ports, and / or each reported sub-configuration indicates or corresponds to a different power offset.

[0303] In some embodiments, when the reporting configuration information includes or indicates the at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: each reporting sub-configuration corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; different reporting sub-configurations correspond to the same second type of rank restriction.

[0304] In some embodiments, where the optional values ​​for the RI and the number of tiers corresponding to the PMI are indicated by the third type of rank limit, the number of tiers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

[0305] In some embodiments, the CSI report satisfies at least one of the following: when the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information; when the reported configuration information does not include or indicate at least one reported sub-configuration but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to the power offset and at least one of the antenna port subset; when the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, wherein the second information corresponds to a first reported sub-configuration in the at least one reported sub-configuration; wherein the second information includes one of the RIs, one of the PMIs, and at least one Channel Quality Indicator (CQI).

[0306] In some embodiments, the CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

[0307] In some embodiments, when the second information included in the CSI report corresponds to a first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: the first reporting sub-configuration is indicated by the network-side device; the number of antenna ports in the subset of antenna ports corresponding to the first reporting sub-configuration is the smallest among the subsets of antenna ports corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; the first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; and the first reporting sub-configuration is determined by the terminal based on the first set.

[0308] In some embodiments, when the reporting configuration information includes or indicates multiple reporting sub-configurations, the CSI report further includes at least one of an RI corresponding to the second reporting sub-configuration and at least one CQI corresponding to the second reporting sub-configuration; wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or, the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

[0309] In some embodiments, the CSI report may also include a specific CQI other than the at least one CQI, the specific CQI satisfying at least one of the following: the specific CQI corresponds to an optional value of the RI other than a first optional value, the first optional value corresponding to the at least one CQI; the specific CQI corresponds to an optional value of the number of layers corresponding to the PMI other than a second optional value, the second optional value corresponding to the at least one CQI.

[0310] In some embodiments, the number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

[0311] In some embodiments, when the CSI is an aperiodic CSI, the method further includes: the network-side device sending a first indication information to the terminal; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, the reporting times of the N aperiodic CSIs are different, and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1.

[0312] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0313] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of at least one reporting sub-configuration included or indicated in the reporting configuration information.

[0314] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0315] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0316] In some embodiments, when the CSI is a semi-persistent CSI, the method further includes: the network-side device sending second indication information to the terminal; wherein the second indication information is used to activate the reporting of the semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times, the target configuration usage order being one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0317] It is understood that the various implementation methods in this method embodiment 600 can refer to the relevant descriptions in the aforementioned method embodiment 200 to achieve the same or corresponding technical effects. To avoid repetition, they will not be described again here.

[0318] Figure 7 shows a flowchart of a CSI reporting method 700 provided in an exemplary embodiment of this application. This method 700 can be executed by, but is not limited to, a network-side device, specifically by hardware and / or software installed in the network-side device. In this embodiment, the method 700 may include at least the following steps.

[0319] S710, the network-side device sends a first instruction message or a second instruction message to the terminal.

[0320] The first indication information is used to trigger the reporting of N non-periodic CSIs. The N non-periodic CSIs are reported at different times and are all associated with the same reporting configuration information. N is an integer greater than 1.

[0321] The second indication information is used to activate the reporting of semi-persistent CSI and to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information. Each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0322] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0323] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of a plurality of reporting sub-configurations included or indicated in the reporting configuration information.

[0324] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0325] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0326] It is understood that the relevant descriptions of each implementation in this method embodiment 700 can refer to the relevant descriptions in the aforementioned method embodiment 200, and achieve the same or corresponding technical effects. To avoid repetition, they will not be repeated here.

[0327] The CSI reporting method provided in this application can be executed by a CSI reporting device. This application uses an example of a CSI reporting device executing the CSI reporting method to illustrate the CSI reporting device provided in this application.

[0328] This application provides a CSI reporting device. As an example, the CSI reporting device can be a communication device or a component within a communication device, such as a chip. The communication device can be a terminal, a network-side device, or a server, etc. Exemplarily, the terminal can be, but is not limited to, the type of terminal 11 listed above, and the network-side device can be, but is not limited to, the type of network-side device 12 listed above. This application does not impose specific limitations.

[0329] The CSI reporting device includes a transmission module (such as a receiving module and a transmitting module) and a processing module. These modules can be implemented in software or hardware. When implemented in hardware, the processing module can be implemented by a processor. For example, the processor can include general-purpose processors, special-purpose processors, such as a Central Processing Unit (CPU), microprocessor, Digital Signal Processor (DSP), Artificial Intelligence (AI) processor, Graphics Processing Unit (GPU), Application Specific Integrated Circuit (ASIC), Network Processor (NP), Field Programmable Gate Array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, etc. The receiving and transmitting modules can be implemented by a communication interface, which can include one or more of the following: transceiver, pins, circuits, bus, radio frequency unit, etc.

[0330] Specifically, referring to Figure 8, when the CSI reporting device is a terminal or a component within a terminal, the CSI reporting device 800 includes a processing module 810 for determining the CSI report; and a transmission module 820 for sending the CSI report to a network-side device; wherein the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0331] In some embodiments, the first information is carried in Part 1 of the CSI report.

[0332] In some embodiments, determining the CSI report includes: obtaining reporting configuration information for CSI reporting; and determining the CSI report based on the reporting configuration information.

[0333] The reported configuration information includes or indicates any of the following: a first type of rank restriction and a second type of rank restriction, wherein the first type of rank restriction is used to indicate the optional value of the RI and the second type of rank restriction is used to indicate the optional value of the number of layers corresponding to the PMI; and a third type of rank restriction, wherein the third type of rank restriction is used to indicate the optional value of the RI and the optional value of the number of layers corresponding to the PMI.

[0334] In some embodiments, when the optional value of the RI is indicated by the first type of rank restriction and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank restriction, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction; or, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the maximum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the minimum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction.

[0335] In some embodiments, at least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

[0336] In some embodiments, the reported configuration information further includes or indicates at least one of the following: power offset; a subset of antenna ports; at least one reported sub-configuration, wherein each reported sub-configuration indicates or corresponds to a different subset of antenna ports, and / or each reported sub-configuration indicates or corresponds to a different power offset.

[0337] In some embodiments, when the reporting configuration information includes or indicates the at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: each reporting sub-configuration corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; different reporting sub-configurations correspond to the same second type of rank restriction.

[0338] In some embodiments, where the optional values ​​for the RI and the number of tiers corresponding to the PMI are indicated by the third type of rank limit, the number of tiers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

[0339] In some embodiments, the CSI report satisfies at least one of the following: when the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information; when the reported configuration information does not include or indicate at least one reported sub-configuration but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to the power offset and at least one of the antenna port subset; when the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, wherein the second information corresponds to a first reported sub-configuration in the at least one reported sub-configuration; wherein the second information includes one of the RIs, one of the PMIs, and at least one Channel Quality Indicator (CQI).

[0340] In some embodiments, the CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

[0341] In some embodiments, when the second information included in the CSI report corresponds to a first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: the first reporting sub-configuration is indicated by the network-side device; the number of antenna ports in the subset of antenna ports corresponding to the first reporting sub-configuration is the smallest among the subsets of antenna ports corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; the first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; and the first reporting sub-configuration is determined by the terminal based on the first set.

[0342] In some embodiments, when the reporting configuration information includes or indicates multiple reporting sub-configurations, the CSI report further includes at least one of an RI corresponding to the second reporting sub-configuration and at least one CQI corresponding to the second reporting sub-configuration; wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or, the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

[0343] In some embodiments, the CSI report may also include a specific CQI other than the at least one CQI, the specific CQI satisfying at least one of the following: the specific CQI corresponds to an optional value of the RI other than a first optional value, the first optional value corresponding to the at least one CQI; the specific CQI corresponds to an optional value of the number of layers corresponding to the PMI other than a second optional value, the second optional value corresponding to the at least one CQI.

[0344] In some embodiments, the number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

[0345] In some embodiments, when the CSI is an aperiodic CSI, determining the CSI report includes: receiving first indication information from the network-side device; determining the CSI report based on the first indication information; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, the reporting times of the N aperiodic CSIs are different, and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1.

[0346] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0347] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of at least one reporting sub-configuration included in the reporting configuration information.

[0348] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0349] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0350] In some embodiments, when the CSI is a semi-persistent CSI, determining the CSI report includes: receiving second indication information from the network-side device; determining the CSI report based on the second indication information; wherein the second indication information is used to activate the reporting of the semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times, the target configuration usage order being one of the configuration usage orders determined based on the reporting sub-configurations included in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0351] The CSI reporting device 800 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG2 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0352] Referring to Figure 9, when the CSI reporting device is a terminal or a component within a terminal, the CSI reporting device 900 includes a transmission module 910 for receiving first indication information or second indication information from a network-side device; and a processing module 920 for sending a CSI report to the network-side device according to the first indication information or the second indication information. The first indication information triggers the reporting of N aperiodic CSIs, where the reporting times of the N aperiodic CSIs are different, and all N aperiodic CSIs are associated with the same reporting configuration information, where N is an integer greater than 1. The second indication information activates the reporting of semi-persistent CSIs, and also indicates the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0353] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0354] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of a plurality of reporting sub-configurations included or indicated in the reporting configuration information.

[0355] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0356] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0357] The CSI reporting device 900 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG5 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0358] Referring to Figure 10, when the CSI reporting device is a network-side device or a component of a network-side device, the CSI reporting device 1000 includes a transmission module 1010 for receiving CSI reports from a terminal; wherein, the CSI report includes first information and a rank indicator RI, the first information being used to indicate the layer number corresponding to the precoding matrix indicator PMI included in the CSI report.

[0359] In some embodiments, the first information is carried in Part 1 of the CSI report.

[0360] In some embodiments, the transmission module 1010 is further configured to send reporting configuration information for CSI reporting to the terminal; wherein the CSI report is determined based on the reporting configuration information, and the reporting configuration information includes or indicates any one of the following: a first type of rank restriction and a second type of rank restriction, wherein the first type of rank restriction is used to indicate the optional value of the RI, and the second type of rank restriction is used to indicate the optional value of the number of layers corresponding to the PMI; a third type of rank restriction, wherein the third type of rank restriction is used to indicate the optional value of the RI and the optional value of the number of layers corresponding to the PMI.

[0361] In some embodiments, when the optional value of the RI is indicated by the first type of rank restriction and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank restriction, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction; or, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the maximum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the minimum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction.

[0362] In some embodiments, at least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

[0363] In some embodiments, the reported configuration information further includes or indicates at least one of the following: power offset; a subset of antenna ports; at least one reported sub-configuration, wherein each reported sub-configuration indicates or corresponds to a different subset of antenna ports, and / or each reported sub-configuration indicates or corresponds to a different power offset.

[0364] In some embodiments, when the reporting configuration information includes or indicates the at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: each reporting sub-configuration corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; different reporting sub-configurations correspond to the same second type of rank restriction.

[0365] In some embodiments, where the optional values ​​for the RI and the number of tiers corresponding to the PMI are indicated by the third type of rank limit, the number of tiers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

[0366] In some embodiments, the CSI report satisfies at least one of the following: when the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information; when the reported configuration information does not include or indicate at least one reported sub-configuration but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to the power offset and at least one of the antenna port subset; when the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, wherein the second information corresponds to a first reported sub-configuration in the at least one reported sub-configuration; wherein the second information includes one of the RIs, one of the PMIs, and at least one Channel Quality Indicator (CQI).

[0367] In some embodiments, the CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

[0368] In some embodiments, when the second information included in the CSI report corresponds to a first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: the first reporting sub-configuration is indicated by the network-side device; the number of antenna ports in the subset of antenna ports corresponding to the first reporting sub-configuration is the smallest among the subsets of antenna ports corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; the first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; and the first reporting sub-configuration is determined by the terminal based on the first set.

[0369] In some embodiments, when the reporting configuration information includes or indicates multiple reporting sub-configurations, the CSI report further includes at least one of an RI corresponding to the second reporting sub-configuration and at least one CQI corresponding to the second reporting sub-configuration; wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or, the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

[0370] In some embodiments, the CSI report may also include a specific CQI other than the at least one CQI, the specific CQI satisfying at least one of the following: the specific CQI corresponds to an optional value of the RI other than a first optional value, the first optional value corresponding to the at least one CQI; the specific CQI corresponds to an optional value of the number of layers corresponding to the PMI other than a second optional value, the second optional value corresponding to the at least one CQI.

[0371] In some embodiments, the number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

[0372] In some embodiments, when the CSI is an aperiodic CSI, the transmission module 1010 is further configured to: send a first indication information to the terminal; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, the reporting times of the N aperiodic CSIs are different, and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1.

[0373] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0374] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of at least one reporting sub-configuration included or indicated in the reporting configuration information.

[0375] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0376] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0377] In some embodiments, when the CSI is a semi-persistent CSI, the transmission module 1010 is further configured to: send a second indication information to the terminal; wherein the second indication information is used to activate the reporting of the semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times, the target configuration usage order being one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0378] The CSI reporting device 1000 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG6 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0379] Referring to Figure 11, when the CSI reporting device is a network-side device or a component within a network-side device, the CSI reporting device 1100 includes: a transmission module 1100, used to send a first indication information or a second indication information to the terminal; wherein, the first indication information is used to trigger the reporting of N aperiodic CSIs, the N aperiodic CSIs having different reporting times and all N aperiodic CSIs being associated with the same reporting configuration information, and N being an integer greater than 1; the second indication information is used to activate the reporting of semi-persistent CSIs and to indicate the target configuration usage order corresponding to the semi-persistent CSIs that need to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0380] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0381] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of a plurality of reporting sub-configurations included or indicated in the reporting configuration information.

[0382] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0383] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0384] The CSI reporting device 1100 provided in this application embodiment can implement the various processes implemented in the method embodiment of FIG7 and achieve the same technical effect. To avoid repetition, it will not be described again here.

[0385] As shown in Figure 12, this application embodiment also provides a communication device 1200, including a processor 1201 and a memory 1202. The memory 1202 stores programs or instructions that can run on the processor 1201. For example, when the communication device 1200 is a terminal, the program or instructions executed by the processor 1201 implement the various steps of the CSI reporting method embodiment 200 or 500 described above, and achieve the same technical effect. When the communication device 1200 is a network-side device, the program or instructions executed by the processor 1201 implement the various steps of the CSI reporting method embodiment 600 or 700 described above, and achieve the same technical effect. To avoid repetition, further details are omitted here.

[0386] This application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps in the method embodiments shown in FIG2 or FIG5. This terminal embodiment corresponds to the above-described terminal-side method embodiments, and all implementation processes and methods of the above-described method embodiments can be applied to this terminal embodiment and can achieve the same technical effect. The terminal can be the CSI reporting device shown in FIG8 or FIG9. Specifically, FIG13 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of this application.

[0387] The terminal 1300 includes, but is not limited to, at least some of the following components: radio frequency unit 1301, network module 1302, audio output unit 1303, input unit 1304, sensor 1305, display unit 1306, user input unit 1307, interface unit 1308, memory 1309, and processor 1310.

[0388] Those skilled in the art will understand that terminal 1300 may also include a power supply (such as a battery) for powering various components. The power supply can be logically connected to processor 1310 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in Figure 13 does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements, which will not be elaborated here.

[0389] It should be understood that, in this embodiment, the input unit 1304 may include a graphics processor 13041 and a microphone 13042. The graphics processor 13041 processes image data of still images or videos obtained by an image capture device (such as a camera) in video capture mode or image capture mode. The display unit 1306 may include a display panel 13061, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like. The user input unit 1307 includes a touch panel 13071 and at least one of other input devices 13072. The touch panel 13071 is also called a touch screen. The touch panel 13071 may include a touch detection device and a touch controller. Other input devices 13072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, power buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

[0390] In this embodiment, after receiving downlink data from the network-side device, the radio frequency unit 1301 can transmit it to the processor 1310 for processing; in addition, the radio frequency unit 1301 can send uplink data to the network-side device. Typically, the radio frequency unit 1301 includes, but is not limited to, antennas, amplifiers, transceivers, couplers, low-noise amplifiers, duplexers, etc.

[0391] The memory 1309 can be used to store software programs or instructions, as well as various data. The memory 1309 may primarily include a first storage area for storing programs or instructions and a second storage area for storing data. The first storage area may store the operating system, application programs or instructions required for at least one function (such as sound playback, image playback, etc.). Furthermore, the memory 1309 may include volatile memory or non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DRRAM). The memory 1309 in this embodiment includes, but is not limited to, these and any other suitable types of memory.

[0392] Processor 1310 may include one or more processing units; optionally, processor 1310 integrates an application processor and a modem processor, wherein the application processor mainly handles operations involving the operating system, user interface, and applications, and the modem processor mainly handles wireless communication signals, such as a baseband processor. It is understood that the aforementioned modem processor may also not be integrated into processor 1310.

[0393] In this terminal embodiment, when corresponding to the terminal-side method embodiment 200 described above, the processor 1310 is used to determine the CSI report; the radio frequency unit 1301 is used to send the CSI report to the network-side device; wherein, the CSI report includes first information and rank indication RI, the first information being used to indicate the layer number corresponding to the precoding matrix indication PMI included in the CSI report.

[0394] In some embodiments, the first information is carried in Part 1 of the CSI report.

[0395] In some embodiments, determining the CSI report includes: obtaining reporting configuration information for CSI reporting; and determining the CSI report based on the reporting configuration information.

[0396] The reported configuration information includes or indicates any of the following: a first type of rank restriction and a second type of rank restriction, wherein the first type of rank restriction is used to indicate the optional value of the RI and the second type of rank restriction is used to indicate the optional value of the number of layers corresponding to the PMI; and a third type of rank restriction, wherein the third type of rank restriction is used to indicate the optional value of the RI and the optional value of the number of layers corresponding to the PMI.

[0397] In some embodiments, when the optional value of the RI is indicated by the first type of rank restriction and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank restriction, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction; or, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the maximum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the minimum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction.

[0398] In some embodiments, when the optional value of the RI is indicated by the first type of rank restriction and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank restriction, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction; or, the maximum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the maximum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction, and the minimum value of the optional values ​​of the RI indicated by the first type of rank restriction is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank restriction.

[0399] In some embodiments, at least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

[0400] In some embodiments, the reported configuration information further includes or indicates at least one of the following: power offset; a subset of antenna ports; at least one reported sub-configuration, wherein each reported sub-configuration indicates or corresponds to a different subset of antenna ports, and / or each reported sub-configuration indicates or corresponds to a different power offset.

[0401] In some embodiments, when the reporting configuration information includes or indicates the at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: each reporting sub-configuration corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; different reporting sub-configurations correspond to the same second type of rank restriction.

[0402] In some embodiments, where the optional values ​​for the RI and the number of tiers corresponding to the PMI are indicated by the third type of rank limit, the number of tiers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

[0403] In some embodiments, the CSI report satisfies at least one of the following: when the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information; when the reported configuration information does not include or indicate at least one reported sub-configuration but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to the power offset and at least one of the antenna port subset; when the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, wherein the second information corresponds to a first reported sub-configuration in the at least one reported sub-configuration; wherein the second information includes one of the RIs, one of the PMIs, and at least one Channel Quality Indicator (CQI).

[0404] In some embodiments, the CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

[0405] In some embodiments, when the second information included in the CSI report corresponds to a first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: the first reporting sub-configuration is indicated by the network-side device; the number of antenna ports in the subset of antenna ports corresponding to the first reporting sub-configuration is the smallest among the subsets of antenna ports corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; the first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; and the first reporting sub-configuration is determined by the terminal based on the first set.

[0406] In some embodiments, when the reporting configuration information includes or indicates multiple reporting sub-configurations, the CSI report further includes at least one of an RI corresponding to the second reporting sub-configuration and at least one CQI corresponding to the second reporting sub-configuration; wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or, the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

[0407] In some embodiments, the CSI report may also include a specific CQI other than the at least one CQI, the specific CQI satisfying at least one of the following: the specific CQI corresponds to an optional value of the RI other than a first optional value, the first optional value corresponding to the at least one CQI; the specific CQI corresponds to an optional value of the number of layers corresponding to the PMI other than a second optional value, the second optional value corresponding to the at least one CQI.

[0408] In some embodiments, the number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

[0409] In some embodiments, when the CSI is an aperiodic CSI, determining the CSI report includes: receiving first indication information from the network-side device; determining the CSI report based on the first indication information; wherein the first indication information is used to trigger the reporting of N aperiodic CSIs, the reporting times of the N aperiodic CSIs are different, and the N aperiodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1.

[0410] In some embodiments, the time units (e.g., time slots, frames, etc.) of the N reference signals associated with the aperiodic CSI are different.

[0411] In some embodiments, each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined based on at least one of the following: the indication order of uplink resources; the transmission time of the uplink resources; wherein the uplink resources are used for reporting the aperiodic CSIs, and the second set is a subset of at least one reporting sub-configuration included in the reporting configuration information.

[0412] In some embodiments, when there are N uplink resources and the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV); or, when there are N uplink resources and the uplink resources are Physical Uplink Control Channels (PUCCH), the N uplink resources have the same time-frequency resource position within a time domain unit.

[0413] In some embodiments, the first indication information is further used to indicate at least one of the following: the reporting sub-configuration associated with each of the aperiodic CSIs; configuration information for carrying uplink resources corresponding to each of the aperiodic CSIs; and reference signals for the N aperiodic CSI measurements.

[0414] In some embodiments, when the CSI is a semi-persistent CSI, determining the CSI report includes: receiving second indication information from the network-side device; determining the CSI report based on the second indication information; wherein the second indication information is used to activate the reporting of the semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times, the target configuration usage order being one of the configuration usage orders determined based on the reporting sub-configurations included in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

[0415] It is understood that the implementation process of each implementation method mentioned in this embodiment can refer to the relevant description of method embodiment 200 and achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0416] In addition, this terminal embodiment can also implement the relevant processes in the above-described terminal-side method embodiment 500, and the implementation process can refer to the relevant description of method embodiment 500 to achieve the same or corresponding technical effects. To avoid repetition, it will not be described again here.

[0417] This application also provides a network-side device, including a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the steps of the method embodiment shown in FIG6 or FIG7. This network-side device embodiment corresponds to the above-described network-side device method embodiment. All implementation processes and methods of the above-described method embodiments can be applied to this network-side device embodiment and can achieve the same technical effect.

[0418] Specifically, this application embodiment also provides a network-side device, which can be the CSI reporting device shown in FIG10 or FIG11. As shown in FIG14, the network-side device 1400 includes: an antenna 1401, a radio frequency device 1402, a baseband device 1403, a processor 1404, and a memory 1405. The antenna 1401 is connected to the radio frequency device 1402. In the uplink direction, the radio frequency device 1402 receives information through the antenna 1401 and sends the received information to the baseband device 1403 for processing. In the downlink direction, the baseband device 1403 processes the information to be transmitted and sends it to the radio frequency device 1402. The radio frequency device 1402 processes the received information and transmits it through the antenna 1401.

[0419] The method executed by the network-side device 1400 in the above embodiments can be implemented in the baseband device 1403, which includes a baseband processor.

[0420] The baseband device 1403 may include at least one baseband board, on which multiple chips are disposed, as shown in FIG14. One of the chips is, for example, a baseband processor, which is connected to the memory 1405 via a bus interface to call the program in the memory 1405 and execute the network device operation shown in the above method embodiment.

[0421] The network-side device 1400 may also include a network interface 1406, such as a Common Public Radio Interface (CPRI).

[0422] Specifically, the network-side device 1400 in this application embodiment further includes: instructions or programs stored in memory 1405 and executable on processor 1404. Processor 1404 calls the instructions or programs in memory 1405 to execute the methods executed by the modules shown in FIG10 or FIG11 and achieve the same technical effect. To avoid repetition, it will not be described in detail here.

[0423] This application also provides a readable storage medium storing a program or instructions. When the program or instructions are executed by a processor, they implement the various processes of the above-described CSI reporting method embodiments and achieve the same technical effect. To avoid repetition, they will not be described again here.

[0424] The processor mentioned above is the processor in the terminal described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0425] This application embodiment also provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor. The processor is used to run programs or instructions to implement the various processes of the above-described CSI reporting method embodiment and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0426] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0427] This application also provides a computer program / program product, which is stored in a storage medium and executed by at least one processor to implement the various processes of the above-described CSI reporting method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0428] This application also provides a wireless communication system, including a terminal and a network-side device. The terminal can be used to implement the various processes of the above-described CSI reporting method embodiment 200, and the network-side device can be used to implement the various processes of the above-described CSI reporting method embodiment 600, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0429] This application also provides a wireless communication system, including a terminal and a network-side device. The terminal can be used to implement the various processes of the above-described CSI reporting method embodiment 500, and the network-side device can be used to implement the various processes of the above-described CSI reporting method embodiment 700, and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0430] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0431] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0432] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A method for reporting Channel State Information (CSI), comprising: The terminal determines the CSI report; The terminal sends the CSI report to the network-side device; The CSI report includes first information and a rank indicator RI. The first information is used to indicate the number of layers corresponding to the precoding matrix indicator PMI included in the CSI report.

2. The method as described in claim 1, wherein, The first information is carried in Part 1 of the CSI report.

3. The method as described in claim 1 or 2, wherein, The terminal determines the CSI report, including: The terminal obtains the reporting configuration information used for CSI reporting; The terminal determines the CSI report based on the reported configuration information; The reported configuration information includes or indicates any of the following: A first type of rank constraint and a second type of rank constraint, wherein the first type of rank constraint is used to indicate the possible values ​​of the RI, and the second type of rank constraint is used to indicate the possible values ​​of the number of layers corresponding to the PMI; The third type of rank constraint is used to indicate the optional values ​​of the RI and the optional values ​​of the number of layers corresponding to the PMI.

4. The method of claim 3, wherein, When the optional value of the RI is indicated by the first type of rank constraint, and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank constraint, The maximum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit; or, The maximum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the maximum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the minimum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit.

5. The method as described in claim 3 or 4, wherein, At least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

6. The method according to any one of claims 3-5, wherein, The reported configuration information also includes or indicates at least one of the following: Power offset; Antenna port subset; At least one reporting sub-configuration, wherein each reporting sub-configuration indicates or corresponds to a different subset of the antenna ports, and / or each reporting sub-configuration indicates or corresponds to a different power offset.

7. The method of claim 6, wherein, When the reporting configuration information includes or indicates at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: Each of the reporting sub-configurations corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; Different reporting sub-configurations correspond to the same second type of rank restriction.

8. The method of claim 3, wherein, When the optional values ​​for the RI and the number of layers corresponding to the PMI are indicated by the third type of rank limit, the number of layers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

9. The method according to any one of claims 3-8, wherein, The CSI report meets at least one of the following criteria: If the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information. If the reported configuration information does not include or indicate at least one reported sub-configuration, but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to at least one of the power offset and the antenna port subset; When the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, which corresponds to the first reported sub-configuration in the at least one reported sub-configuration. The second information includes an RI, a PMI, and at least one Channel Quality Indicator (CQI).

10. The method of claim 9, wherein, The CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

11. The method of claim 9, wherein, When the second information included in the CSI report corresponds to the first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: The first reporting sub-configuration is indicated by the network-side device; The number of antenna ports in the antenna port subset corresponding to the first reporting sub-configuration is the smallest among the antenna port subsets corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; The first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; The first reporting sub-configuration is determined by the terminal based on the first set.

12. The method of claim 11, wherein, When the reported configuration information includes or indicates multiple reported sub-configurations, the CSI report also includes at least one of the RI corresponding to the second reported sub-configuration and at least one CQI corresponding to the second reported sub-configuration; Wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

13. The method according to any one of claims 9-11, wherein, The CSI report also includes a specific CQI in addition to the at least one CQI, wherein the specific CQI satisfies at least one of the following: The specific CQI corresponds to the other optional values ​​of the RI, excluding the first optional value, and the first optional value corresponds to the at least one CQI; The specific CQI corresponds to the other optional values ​​among the possible values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

14. The method according to any one of claims 1-13, wherein, The number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

15. The method according to any one of claims 1-14, wherein, In the case that the CSI is a non-periodic CSI, the terminal determines the CSI report, including: The terminal receives first indication information from the network-side device; The terminal determines the CSI report based on the first indication information; The first indication information is used to trigger the reporting of N aperiodic CSIs. The N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information. N is an integer greater than 1.

16. The method of claim 15, wherein, Each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined according to at least one of the following: The order in which upstream resources are indicated; The time of transmission of uplink resources; The uplink resources are used for reporting the non-periodic CSI, and the second set is a subset of at least one reporting sub-configuration included in the reporting configuration information.

17. The method of claim 16, wherein, In the presence of N uplink resources, and where the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV). Alternatively, if there are N uplink resources and the uplink resources are physical uplink control channels (PUCCH), the N uplink resources have the same time-frequency resource location within a time domain unit.

18. The method according to any one of claims 15-17, wherein, The first indication information is also used to indicate at least one of the following: The reporting sub-configuration of each of the aforementioned aperiodic CSI associations; Configuration information used to carry uplink resources corresponding to each of the aforementioned non-periodic CSIs; Reference signals used for N of the aforementioned aperiodic CSI measurements.

19. The method according to any one of claims 1-14, wherein, In the case of semi-continuous CSI, the terminal determines the CSI report, including: The terminal receives a second indication information from the network-side device; The terminal determines the CSI report based on the second indication information; The second indication information is used to activate the reporting of the semi-persistent CSI. The second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included in the reporting configuration information. Each semi-persistent CSI is associated with at least one reporting sub-configuration.

20. A method for reporting Channel State Information (CSI), comprising: The terminal receives a first indication message or a second indication message from the network-side device; The terminal sends a CSI report to the network-side device according to the first instruction information or the second instruction information; Wherein, the first indication information is used to trigger the reporting of N non-periodic CSIs, wherein the reporting time of the N non-periodic CSIs is different, and the N non-periodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1; The second indication information is used to activate the reporting of semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times, wherein the target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information, and each semi-persistent CSI is associated with at least one reporting sub-configuration.

21. The method of claim 20, wherein, Each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined according to at least one of the following: The order in which upstream resources are indicated; The time of transmission of uplink resources; The uplink resources are used for reporting the non-periodic CSI, and the second set is a subset of multiple reporting sub-configurations included or indicated in the reporting configuration information.

22. The method of claim 21, wherein, In the presence of N uplink resources, and where the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV). Alternatively, if there are N uplink resources and the uplink resources are physical uplink control channels (PUCCH), the N uplink resources have the same time-frequency resource location within a time domain unit.

23. The method according to any one of claims 20-22, wherein, The first indication information is also used to indicate at least one of the following: The reporting sub-configuration of each of the aforementioned aperiodic CSI associations; Configuration information used to carry uplink resources corresponding to each of the aforementioned non-periodic CSIs; Reference signals used for N of the aforementioned aperiodic CSI measurements.

24. A method for reporting Channel State Information (CSI), comprising: The network-side device receives a CSI report from the terminal; The CSI report includes first information and a rank indicator RI. The first information is used to indicate the number of layers corresponding to the precoding matrix indicator PMI included in the CSI report.

25. The method of claim 24, wherein, The first information is carried in Part 1 of the CSI report.

26. The method of claim 24 or 25, wherein, The method further includes: The network-side device sends reporting configuration information for CSI reporting to the terminal; The CSI report is determined based on the reported configuration information, which includes or indicates any of the following: A first type of rank constraint and a second type of rank constraint, wherein the first type of rank constraint is used to indicate the possible values ​​of the RI, and the second type of rank constraint is used to indicate the possible values ​​of the number of layers corresponding to the PMI; The third type of rank constraint is used to indicate the optional values ​​of the RI and the optional values ​​of the number of layers corresponding to the PMI.

27. The method of claim 26, wherein, When the optional value of the RI is indicated by the first type of rank limit and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank limit, the maximum value of the optional values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit. or, The maximum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the maximum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the minimum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit.

28. The method of claim 26 or 27, wherein, At least one of the first type of rank restriction and the second type of rank restriction is indicated by a bitmap.

29. The method according to any one of claims 26-28, wherein, The reported configuration information also includes or indicates at least one of the following: Power offset; Antenna port subset; At least one reporting sub-configuration, wherein each reporting sub-configuration indicates or corresponds to a different subset of the antenna ports, and / or each reporting sub-configuration indicates or corresponds to a different power offset.

30. The method of claim 29, wherein, When the reporting configuration information includes or indicates at least one reporting sub-configuration, the reporting sub-configuration satisfies at least one of the following: Each of the reporting sub-configurations corresponds to a different first type of rank restriction, or different reporting sub-configurations correspond to the same first type of rank restriction; Different reporting sub-configurations correspond to the same second type of rank restriction.

31. The method of claim 26, wherein, When the optional values ​​for the RI and the number of layers corresponding to the PMI are indicated by the third type of rank limit, the number of layers corresponding to the PMI included in the CSI report is the maximum value among the optional values ​​indicated by the third type of rank limit.

32. The method according to any one of claims 26-31, wherein, The CSI report meets at least one of the following criteria: If the reported configuration information does not include or indicate power offset, antenna port subset, or at least one reported sub-configuration, the CSI report includes second information. If the reported configuration information does not include or indicate at least one reported sub-configuration, but includes or indicates at least one of the power offset and the antenna port subset, the CSI report includes second information, wherein the second information corresponds to at least one of the power offset and the antenna port subset; When the reported configuration information includes or indicates at least one reported sub-configuration, the CSI report includes second information, which corresponds to the first reported sub-configuration in the at least one reported sub-configuration. The second information includes an RI, a PMI, and at least one Channel Quality Indicator (CQI).

33. The method of claim 32, wherein, The CQI is determined based on the first L layers of precoding in the precoding matrix corresponding to the PMI, where L is indicated by the RI and L is greater than or equal to 1.

34. The method of claim 32, wherein, When the second information included in the CSI report corresponds to the first reporting sub-configuration in the at least one reporting sub-configuration, the first reporting sub-configuration satisfies at least one of the following: The first reporting sub-configuration is indicated by the network-side device; The number of antenna ports in the antenna port subset corresponding to the first reporting sub-configuration is the smallest among the antenna port subsets corresponding to each reporting sub-configuration included in the first set, and the first set is a subset of the at least one reporting sub-configuration; The first reporting sub-configuration is a reporting sub-configuration with a specific identifier in the first set; The first reporting sub-configuration is determined by the terminal based on the first set.

35. The method of claim 34, wherein, When the reported configuration information includes or indicates multiple reported sub-configurations, the CSI report also includes at least one of the RI corresponding to the second reported sub-configuration and at least one CQI corresponding to the second reported sub-configuration; Wherein, the second reporting sub-configuration includes at least one of the other reporting sub-configurations besides the first reporting sub-configuration, or the second reporting sub-configuration includes at least one of the other indicated reporting sub-configurations besides the first reporting sub-configuration.

36. The method according to any one of claims 32-34, wherein, The CSI report also includes a specific CQI in addition to the at least one CQI, wherein the specific CQI satisfies at least one of the following: The specific CQI corresponds to the other optional values ​​of the RI, excluding the first optional value, and the first optional value corresponds to the at least one CQI; The specific CQI corresponds to the other optional values ​​among the possible values ​​of the number of layers corresponding to the PMI, except for the second optional value, and the second optional value corresponds to the at least one CQI.

37. The method according to any one of claims 24-36, wherein, The number of layers in the PMI is greater than or equal to the number of layers indicated by the RI.

38. The method according to any one of claims 24-37, wherein, When the CSI is aperiodic CSI, the method further includes: The network-side device sends a first instruction message to the terminal; The first indication information is used to trigger the reporting of N aperiodic CSIs. The N aperiodic CSIs are reported at different times and are all associated with the same reporting configuration information. N is an integer greater than 1.

39. The method of claim 38, wherein, Each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined according to at least one of the following: The order in which upstream resources are indicated; The time of transmission of uplink resources; The uplink resources are used for reporting the non-periodic CSI, and the second set is a subset of at least one reporting sub-configuration included or indicated in the reporting configuration information.

40. The method of claim 39, wherein, In the presence of N uplink resources, and where the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV). Alternatively, if there are N uplink resources and the uplink resources are physical uplink control channels (PUCCH), the N uplink resources have the same time-frequency resource location within a time domain unit.

41. The method according to any one of claims 38-40, wherein, The first indication information is also used to indicate at least one of the following: The reporting sub-configuration of each of the aforementioned aperiodic CSI associations; Configuration information used to carry uplink resources corresponding to each of the aforementioned non-periodic CSIs; Reference signals used for N of the aforementioned aperiodic CSI measurements.

42. The method according to any one of claims 24-37, wherein, When the CSI is semi-continuous CSI, the method further includes: The network-side device sends a second instruction message to the terminal; The second indication information is used to activate the reporting of the semi-persistent CSI, and the second indication information is also used to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information. Each semi-persistent CSI is associated with at least one reporting sub-configuration.

43. A method for reporting Channel State Information (CSI), comprising: The network-side device sends a first instruction message or a second instruction message to the terminal; Wherein, the first indication information is used to trigger the reporting of N non-periodic CSIs, wherein the reporting time of the N non-periodic CSIs is different, and the N non-periodic CSIs are all associated with the same reporting configuration information, and N is an integer greater than 1; The second indication information is used to activate the reporting of semi-persistent CSI and to indicate the target configuration usage order corresponding to the semi-persistent CSI that needs to be reported at different reporting times. The target configuration usage order is one of the configuration usage orders determined based on the reporting sub-configurations included or indicated in the reporting configuration information. Each semi-persistent CSI is associated with at least one reporting sub-configuration.

44. The method of claim 43, wherein, Each of the aperiodic CSIs is associated with a second set, wherein the association between the aperiodic CSIs and the second set is determined according to at least one of the following: The order in which upstream resources are indicated; The time of transmission of uplink resources; The uplink resources are used for reporting the non-periodic CSI, and the second set is a subset of multiple reporting sub-configurations included or indicated in the reporting configuration information.

45. The method of claim 44, wherein, In the presence of N uplink resources, and where the uplink resources are Physical Uplink Shared Channels (PUSCH), the N uplink resources correspond to the same start and length indication value (SLIV). Alternatively, if there are N uplink resources and the uplink resources are physical uplink control channels (PUCCH), the N uplink resources have the same time-frequency resource location within a time domain unit.

46. ​​The method according to any one of claims 43-45, wherein, The first indication information is also used to indicate at least one of the following: The reporting sub-configuration of each of the aforementioned aperiodic CSI associations; Configuration information used to carry uplink resources corresponding to each of the aforementioned non-periodic CSIs; Reference signals used for N of the aforementioned aperiodic CSI measurements.

47. A device for reporting Channel State Information (CSI), comprising: The processing module is used to determine the CSI report; The transmission module is used to send the CSI report to the network-side device; The CSI report includes first information and a rank indicator RI. The first information is used to indicate the number of layers corresponding to the precoding matrix indicator PMI included in the CSI report.

48. The apparatus of claim 47, wherein, The first information is carried in Part 1 of the CSI report.

49. The apparatus of claim 47 or 48, wherein, The determination of the CSI report includes: Obtain the reporting configuration information used for CSI reporting; The CSI report is determined based on the reported configuration information; The reported configuration information includes or indicates any of the following: A first type of rank constraint and a second type of rank constraint, wherein the first type of rank constraint is used to indicate the possible values ​​of the RI, and the second type of rank constraint is used to indicate the possible values ​​of the number of layers corresponding to the PMI; The third type of rank constraint is used to indicate the optional values ​​of the RI and the optional values ​​of the number of layers corresponding to the PMI.

50. The apparatus of claim 49, wherein, When the optional value of the RI is indicated by the first type of rank limit and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank limit, the maximum value of the optional values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit. or, The maximum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the maximum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the minimum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit.

51. A device for reporting Channel State Information (CSI), comprising: The transmission module is used to receive CSI reports from the terminal; The CSI report includes first information and a rank indicator RI. The first information is used to indicate the number of layers corresponding to the precoding matrix indicator PMI included in the CSI report.

52. The apparatus of claim 51, wherein, The first information is carried in Part 1 of the CSI report.

53. The apparatus of claim 51 or 52, wherein, The transmission module is also used to send reporting configuration information for CSI reporting to the terminal; The CSI report is determined based on the reported configuration information, which includes or indicates any of the following: A first type of rank constraint and a second type of rank constraint, wherein the first type of rank constraint is used to indicate the possible values ​​of the RI, and the second type of rank constraint is used to indicate the possible values ​​of the number of layers corresponding to the PMI; The third type of rank constraint is used to indicate the optional values ​​of the RI and the optional values ​​of the number of layers corresponding to the PMI.

54. The apparatus of claim 53, wherein, When the optional value of the RI is indicated by the first type of rank limit and the optional value of the number of layers corresponding to the PMI is indicated by the second type of rank limit, the maximum value of the optional values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value of the optional values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit. or, The maximum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the maximum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit, and the minimum value among the possible values ​​of the RI indicated by the first type of rank limit is less than or equal to the minimum value among the possible values ​​of the number of layers corresponding to the PMI indicated by the second type of rank limit.

55. A terminal comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as claimed in any one of claims 1 to 23.

56. A network-side device comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as claimed in any one of claims 24 to 46.

57. A readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the method as claimed in any one of claims 1 to 23, or implement the steps of the method as claimed in any one of claims 24 to 46.

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