Channel state information feedback method and related device

Abstract

The invention provides a channel state information feedback method and a related device. In the channel state information feedback method provided by the present application, according to the correlation between the analog beams, the common CSI parameters of the plurality of resources in one-to-one correspondence with the plurality of analog beams are calculated, and the common CSI parameters are used as the same CSI parameter corresponding to the plurality of resources, thereby preventing the terminal device from feeding back all CSI parameters for each resource, thereby reducing the feedback overhead.

Description

Technical Field

[0001] The present application relates to the field of communications, and in particular to a channel state information feedback method and related devices. Background Art

[0002] In high-frequency communication systems, hybrid beamforming (HBF) technology can confine the energy of transmitted signals to a specific beam direction, achieving higher antenna array gain. HBF technology requires beam scanning to ensure that the simulated beam is aligned with the communication target.

[0003] One beam scanning process is as follows: the base station sends reference signals to the terminal through different analog beams. The reference signals correspond one-to-one with the analog beams. The terminal measures the reference signals to determine the channel state information (CSI) of the corresponding channel. The CSI can reflect the beam quality of the analog beam corresponding to the reference signal. Based on the CSI, a matching analog beam can be determined for the terminal device to achieve beam alignment.

[0004] However, when the number of simulated beams increases, the feedback overhead required for reporting CSI also increases. How to reduce the feedback overhead required during beam scanning becomes a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The present application provides a channel state information feedback method and related devices, aiming to reduce feedback overhead.

[0006] In a first aspect, the present application provides a channel state information feedback method, which is applied to a terminal side, such as a terminal device or a communication module in a terminal device, or a circuit or chip responsible for a communication function in a terminal device (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or system-in-package (SIP) chip containing a modem core). Taking the application of this method to a terminal device as an example, the method includes:

[0007] Determine first channel state information CSI, where the first CSI includes a first rank indicator (RI) and / or a first precoding matrix indicator (PMI), where the first RI is the RI corresponding to N reference signals, and the first PMI is the PMI corresponding to the N reference signals, where the N reference signals correspond one-to-one to the N resources in the resource set, and N is an integer greater than 1; and send the first CSI to the network device.

[0008] The first RI is an RI, the PMI includes an indication i1 and an indication i2, and the first PMI includes an indication i1 and / or an indication i2.

[0009] For one CSI parameter, one CSI parameter is used as the common CSI parameter corresponding to N resources for joint reporting, thereby streamlining the information included in the first CSI and reducing CSI feedback overhead.

[0010] In some implementations, the first CSI further includes a first parameter, the first parameter including at least one of the following parameters: a channel status information reference signal (CSI-RS) resource indicator (CSI-RS resource indicator, CRI), a wideband channel quality indicator (CQI) of the first transport block (TB), a subband differential CQI of the first TB, a layer indicator (LI), a wideband CQI of the second TB, an even subband differential CQI of the second TB, or an odd subband differential CQI of the second TB.

[0011] Each parameter in the first parameters includes one or more parameters corresponding to N reference signals.

[0012] In some implementations, before determining the first channel state information CSI, the method further includes:

[0013] First indication information is received from a network device, where the first indication information is used to indicate whether the first CSI includes a first RI and / or a first PMI.

[0014] In some implementations, determining first channel state information (CSI) includes:

[0015] Whether the first CSI includes the first RI and / or the first PMI is determined according to a value corresponding to the first RI.

[0016] According to the first indication information or the value of the first RI, the CSI parameters that need to be jointly reported in the first CSI can be determined, thereby reducing feedback overhead while ensuring the quality of CSI feedback.

[0017] In some implementations, the first PMI is a wideband PMI and / or a subband PMI, and the subband PMI includes an odd subband PMI and / or an even subband PMI.

[0018] When CSI is reported, it can be divided into broadband reporting and sub-band reporting. Broadband reporting means measuring and reporting only one value on the entire configured bandwidth. The reported value represents the entire frequency bandwidth. Sub-band reporting means dividing the entire configured bandwidth into multiple sub-bands, measuring and reporting a value on each sub-band, and each reported value represents only a specific bandwidth. Correspondingly, the first PMI can also be divided into broadband PMI and sub-band PMI. When the entire configured bandwidth is divided into multiple sub-bands and numbered, the sub-bands can be classified according to the parity of their numerical numbers. Sub-bands with odd numerical numbers are odd sub-bands, and sub-bands with even numerical numbers are even sub-bands. Therefore, the sub-band PMI includes odd sub-band PMI and / or even sub-band PMI.

[0019] In some implementations, a correlation between channel coefficients corresponding to any two resources among the N resources is greater than or equal to a first threshold.

[0020] In some implementations, before determining the first channel state information CSI, the method further includes:

[0021] Second indication information is received from a network device, where the second indication information is used to indicate that N resources belong to a first resource group, where the first resource group is a resource group that includes at least one resource in a resource set.

[0022] In some implementations, the first dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent; and / or the second dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent.

[0023] In the present application, when grouping and judging the resources in the resource set, the beams selected by the resources are used to indicate discrete Fourier transformation (DFT) digital beams, rather than analog beams.

[0024] The terminal device and the network device can determine N resources from multiple resources configured in the resource set based on the correlation between the simulated beams corresponding to the resources.

[0025] In a second aspect, the present application provides a channel state information feedback method, which is applied to the network side, such as a positioning server on the network side or a component in the positioning server (such as a circuit, chip or chip system, etc.). Taking the method as an example of applying the method to a network device, the method includes:

[0026] Receive a first CSI from a terminal device, where the first CSI includes a first RI and / or a first PMI, where the first RI is the RI corresponding to N reference signals, and the first PMI is the PMI corresponding to the N reference signals. The N reference signals correspond one-to-one to the N resources in the resource set, and N is an integer greater than 1.

[0027] In some implementations, before receiving the first CSI from the terminal device, the method further includes:

[0028] Send first indication information to the terminal device, where the first indication information is used to indicate whether the first CSI includes the first RI and / or the first PMI.

[0029] In some implementations, the first PMI is a wideband PMI and / or a subband PMI, and the subband PMI includes an odd subband PMI and / or an even subband PMI.

[0030] In some implementations, before receiving the first CSI from the terminal device, the method further includes:

[0031] Send second indication information to the terminal device, where the second indication information is used to indicate that N resources belong to a first resource group, where the first resource group is a resource group that contains at least one resource in a resource set.

[0032] In some implementations, the first dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent; and / or the second dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent.

[0033] In a third aspect, the present application provides a channel state information feedback apparatus, comprising modules or units for implementing the method in the first aspect and any possible implementation of the first aspect, or modules for implementing the method in the second aspect and any possible implementation of the second aspect. Each module or unit may implement a corresponding function by executing a computer program.

[0034] Exemplarily, the channel state information feedback device in the third aspect is a terminal device, or a component configured in the terminal device, such as a chip, a chip system, a processor, etc., or the channel state information feedback device in the third aspect is a network device, or a component configured in the network device, such as a chip, a chip system, a processor, etc.

[0035] In a fourth aspect, the present application provides a channel state information feedback device, comprising a processor, the processor being used to execute the channel state information feedback method in the first aspect and any possible implementation of the first aspect, or to execute the channel state information feedback method in the second aspect and any possible implementation of the second aspect.

[0036] Optionally, the device may further include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the methods described in the above aspects may be implemented.

[0037] Optionally, the device may further include a communication interface, which is used for the device to communicate with other communication devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin or other types of communication interfaces.

[0038] Exemplarily, the channel state information feedback device provided in the fourth aspect is a chip or a chip system.

[0039] In a fifth aspect, the present application provides a channel state information feedback device, comprising a processor and a communication interface, the communication interface being configured to receive signals from other communication devices outside the channel state information feedback device and transmit them to the processor, or to send signals from the processor to other communication devices outside the channel state information feedback device, the processor implementing the channel state information feedback method in the first aspect and any possible implementation of the first aspect, or implementing the channel state information feedback method in the second aspect and any possible implementation of the second aspect, through a logic circuit or executing code instructions. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin, or other type of communication interface.

[0040] Optionally, the apparatus further includes a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the channel state information feedback method according to the first aspect and any possible implementation of the first aspect can be implemented, or the channel state information feedback method according to the second aspect and any possible implementation of the second aspect can be implemented.

[0041] In a sixth aspect, the present application provides a channel state information feedback device, comprising a processor and a memory, the memory being used to store instructions and data. When the processor executes the instructions stored in the memory, it can implement the channel state information feedback method in the first aspect and any possible implementation of the first aspect, or implement the channel state information feedback method in the second aspect and any possible implementation of the second aspect.

[0042] Optionally, the device further includes a communication interface, which is used for the device to communicate with other communication devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, pin or other type of communication interface.

[0043] Exemplarily, the channel state information feedback device in the fifth aspect and the sixth aspect is a terminal device or a network device.

[0044] In the seventh aspect, the present application provides a chip system comprising at least one processor for supporting the implementation of the functions involved in the above-mentioned first aspect and any possible implementation method of the first aspect, or for supporting the implementation of the functions involved in the above-mentioned second aspect and any possible implementation method of the second aspect, such as receiving or processing the data and / or information involved in the above-mentioned method.

[0045] In one possible design, the chip system also includes a memory, which is used to store program instructions and data. The memory is located inside or outside the processor.

[0046] The chip system can be composed of chips, or can include chips and other discrete devices.

[0047] In an eighth aspect, the present application provides a computer-readable storage medium comprising a computer program, which, when executed on a computer, enables the computer to implement the method in the first or second aspect and any possible implementation of the first or second aspect.

[0048] In the ninth aspect, the present application provides a computer program product, which includes: a computer program (also referred to as code, or instructions), which, when run, enables the computer to execute the method in the first or second aspect and any possible implementation of the first or second aspect.

[0049] In the tenth aspect, a communication system is provided, comprising the aforementioned terminal device and network device, wherein the terminal device can be used to implement the method in the first aspect and any possible implementation of the first aspect, and the network device can be used to implement the method in the second aspect and any possible implementation of the second aspect.

[0050] The third to tenth aspects of this application correspond to the technical solutions of the first and second aspects of this application. The beneficial effects achieved by each aspect and the corresponding feasible implementation methods are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0052] Figure 1 A schematic diagram of the architecture of a communication system used in an embodiment of the present application;

[0053] Figure 2 A schematic diagram of an access network device used in an embodiment of the present application;

[0054] Figure 3 A schematic diagram of hybrid beamforming provided by this application;

[0055] Figure 4 Schematic diagram of a spatial beam index under 16 CSI-RS ports;

[0056] Figure 5 Schematic diagram of signaling transmission when performing channel measurement between network equipment and terminal equipment;

[0057] Figure 6 A schematic diagram of a flow chart of a channel state information feedback method provided in one embodiment of the present application;

[0058] Figure 7 A schematic diagram of a flow chart of a channel state information feedback method provided in one embodiment of the present application;

[0059] Figure 8 A schematic block diagram of a channel state information feedback device provided in one embodiment of the present application;

[0060] Figure 9 A schematic structural diagram of a channel state information feedback device provided in another embodiment of the present application;

[0061] Figure 10 A schematic structural diagram of a channel state information feedback device provided in yet another embodiment of the present application.

[0062] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0063] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0064] It should be understood that in this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship, but it does not exclude the situation where it indicates that the previous and next associated objects are in an "and" relationship. The specific meaning can be understood in conjunction with the context. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, c can be single or multiple.

[0065] In this application, prefixes such as "first" and "second" are used solely to distinguish between different items within the same category and do not constrain the order, size, or quantity of the items. For example, "first threshold" and "second threshold" are simply different thresholds; there is no temporal, size, or priority relationship between them.

[0066] The technical solutions provided in this application can be applied to various communication systems, such as long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), sidelink (SL) communication system, universal mobile telecommunication system (UMTS), world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) mobile communication system or new radio access technology (NR). Among them, the 5G mobile communication system may include non-standalone (NSA) and / or standalone (SA). The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation (6G) mobile communication systems. This application is not limited to this.

[0067] Figure 1A schematic diagram of the architecture of a communication system used in an embodiment of the present application. Figure 1 A schematic diagram of a possible, non-limiting system architecture is shown. Figure 1 As shown, the communication system 1000 includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one RAN node (e.g. Figure 1 110a and 110b in, collectively referred to as 110) and at least one terminal device (such as Figure 1 120a-120j in the figure are collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices ( Figure 1 (not shown) etc. Terminal device 120 is wirelessly connected to RAN node 110. RAN node 110 is wirelessly or wiredly connected to core network 200. The core network devices in core network 200 and RAN node 110 in RAN 100 can be different physical devices, or they can be the same physical device that integrates core network logical functions and radio access network logical functions.

[0068] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or a future-oriented evolutionary system (such as a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (Wi-Fi) system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0069] The RAN node 110, sometimes also referred to as access network equipment, RAN entity, or access node, is part of the communication system and is used to help terminal devices achieve wireless access. The multiple RAN nodes 110 in the communication system 1000 can be nodes of the same type or different types. In some scenarios, the roles of the RAN node 110 and the terminal device 120 are relative, for example, Figure 1The network element 120i can be a helicopter or a drone, which can be configured as a mobile base station. For the terminal devices 120j that access the RAN 100 through the network element 120i, the network element 120i is a base station; but for the base station 110a, the network element 120i is a terminal device. The RAN node 110 and the terminal device 120 are sometimes referred to as communication devices, for example Figure 1 The network elements 110a and 110b may be understood as communication devices having base station functions, and the network elements 120a-120j may be understood as communication devices having terminal functions.

[0070] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a 6G mobile communication system, a base station in a future mobile communication system, or an access node in a Wi-Fi system. A RAN node may be a macro base station (e.g. Figure 1 110a in), micro base stations or indoor stations (such as Figure 1 110b in the example above), a relay node or a donor node, or a wireless controller in a CRAN scenario. Alternatively, a RAN node may be a server, a wearable device, a vehicle, or an onboard device. For example, the access network device in vehicle-to-everything (V2X) technology may be a roadside unit (RSU).

[0071] In another possible scenario, multiple RAN nodes collaborate to assist the terminal in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU), a CU control plane (CU-CP), a CU user plane (CU-UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0072] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called open CU (open-CU, O-CU), DU may also be called open DU (open-DU, O-DU), CU-CP may also be called open CU-CP (open-CU-CP, O-CU-CP), CU-UP may also be called open CU-UP (open-CU-UP, O-CU-UP), and RU may also be called open RU (open-RU, O-RU). For convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0073] Terminal devices can also be referred to as terminals, user equipment (UE), mobile stations, or mobile terminals. They can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), the Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, and smart cities. Terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, and smart home appliances.

[0074] In the embodiment of the present application, the network device may be, for example, Figure 1 The RAN node 110 shown in FIG, the terminal device may be, for example, Figure 1 In the terminal device 120 shown in FIG, multiple network devices can simultaneously transmit data or control signaling for a single terminal device. This application does not specifically limit the types of network devices and terminal devices.

[0075] In addition, terminal devices and network devices can be hardware devices, or software functions running on dedicated hardware, software functions running on general-purpose hardware, such as virtualization functions instantiated on a platform (for example, a cloud platform), or entities including dedicated or general-purpose hardware devices and software functions. This application does not limit the specific form of terminal devices and network devices.

[0076] Figure 2 Schematic diagram of access network equipment used in the embodiment of this application. Figure 2 As shown, the access network equipment includes one or more CUs, one or more DUs, and one or more RUs. For the sake of clarity, Figure 2 Only one CU, DU, and RU are shown. The CU is used to connect to the core network and one or more DUs. Optionally, the CU may have some of the core network's functions. The CU may include a CU-CP and a CU-UP.

[0077] The CU and DU can be configured according to the protocol layer functions of the wireless network they implement: for example, the CU is configured to implement the functions of the packet data convergence protocol (PDCP) layer and the protocol layers above it (such as the radio resource control protocol (RRC) layer and / or the service data adaptation protocol (SDAP) layer, etc.); the DU is configured to implement the functions of the protocol layers below the PDCP layer (such as the radio link control (RLC) layer, the medium access control (MAC) layer, and / or the physical (PHY) layer, etc.). For another example, the CU is configured to implement the functions of the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and the DU is configured to implement the functions of the PDCP layer and the protocol layers below it (such as the RLC layer, the MAC layer, and / or the PHY layer, etc.).

[0078] When a CU includes a CU-CP and a CU-UP, the CU-CP is used to implement the control plane functions of the CU, and the CU-UP is used to implement the user plane functions of the CU. For example, when the CU is configured to implement the functions of the PDCP layer, RRC layer, and SDAP layer, the CU-CP is used to implement the RRC layer functions and the control plane functions of the PDCP layer, and the CU-UP is used to implement the SDAP layer functions and the user plane functions of the PDCP layer.

[0079] The CU-CP can interact with network elements in the core network that implement control plane functions. These elements can be access and mobility function elements, such as the access and mobility management function (AMF) element in the 5G system. The AMF element is responsible for mobility management in mobile networks, such as location updates for terminal devices, network registration for terminal devices, and handovers for terminal devices.

[0080] The CU-UP can interact with network elements in the core network that implement user plane functions. Network elements in the core network that implement user plane functions, such as the user plane function (UPF) network element in the 5G system, are responsible for forwarding and receiving data in terminal devices.

[0081] The above configuration of CU and DU is only an example, and the functions of CU and DU can also be configured as needed. For example, the CU or DU can be configured to have the functions of more protocol layers, or the CU or DU can be configured to have partial processing functions of the protocol layer. For example, some functions of the RLC layer and the functions of the protocol layers above the RLC layer are set in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are set in the DU. For another example, the functions of the CU or DU can be divided according to the service type or other system requirements, such as by delay, and the functions whose processing time needs to meet the smaller delay requirement are set in the DU, and the functions that do not need to meet the delay requirement are set in the CU.

[0082] The DU and RU can work together to implement the functions of the PHY layer. A DU can be connected to one or more RUs. The functions of the DU and RU can be configured in various ways according to the design. For example, the DU is configured to implement the baseband function, and the RU is configured to implement the mid-RF function. For another example, the DU is configured to implement the high-layer functions in the PHY layer, and the RU is configured to implement the low-layer functions in the PHY layer or to implement the low-layer functions and the RF functions. The high-layer functions in the physical layer may include a part of the functions of the physical layer, which is closer to the MAC layer, and the low-layer functions in the physical layer may include another part of the functions of the physical layer, which is closer to the mid-RF side.

[0083] To facilitate understanding of the embodiments of the present application, the technical terms related to the present application are explained below.

[0084] 1. Antenna Port: An antenna port is a logical concept and does not directly correspond to a physical antenna. An antenna port is typically associated with a reference signal and can be understood as a transceiver interface on the channel through which the reference signal travels. For low-frequency systems, an antenna port may correspond to one or more antenna elements, which jointly transmit reference signals. The receiver can treat them as a whole without distinguishing between the elements. For high-frequency systems, an antenna port may correspond to a beam. Similarly, the receiver only needs to treat the beam as an interface, without distinguishing between individual elements.

[0085] In an embodiment of the present application, the antenna port that sends the analog beam can be called an analog antenna port, or simply an antenna port.

[0086] The port group mentioned in the embodiments of the present application can be multiple digital ports corresponding to the same analog beam, or the port group can be a collection of multiple digital ports corresponding to multiple analog beams, or the digital ports corresponding to the same analog beam are divided into multiple subsets, each subset being a port group. The port group can also be called a digital-analog port group, etc.

[0087] 2. Beam: A beam is a communication resource. It can be wide, narrow, or any other type of beam. The technology used to form a beam is called beamforming. Beamforming adjusts the amplitude and / or phase of a signal to impart certain directionality to the signal radiated by an antenna array, thereby achieving higher antenna array gain. The main lobe of the antenna array's radiation pattern is called the beam.

[0088] In beamforming technology, the signal is filtered by a spatial domain transmission filter to adjust the amplitude and / or phase. Different spatial domain transmission filters use different spatial domain filtering parameters to achieve beams in different directions. In the embodiments of the present application, the spatial domain filtering parameters can be replaced by beams, or the spatial domain filtering parameters can be replaced by spatial domain transmission filters. Spatial domain transmission filters can also be called spatial filters.

[0089] Specifically, beamforming technologies include digital beamforming (DBF), analog beamforming (ABF), and hybrid digital-analog beamforming (HBF). DBF technology features multiple digital processing channels, each of which adjusts the phase (or amplitude and phase) of the signal in the digital domain, ensuring that the radiated signal from the antenna has directionality. Therefore, DBF technology can implement the aforementioned spatial transmission filter function through multiple digital processing channels. ABF technology can simultaneously transmit signals through an antenna array consisting of multiple antenna elements, with each antenna element corresponding to a phase shifter. By adjusting the phase of the phase shifter corresponding to each antenna element, the radiated signal from the antenna array has directionality. Therefore, ABF technology can implement the aforementioned spatial transmission filter function through multiple phase shifters corresponding to multiple elements in the antenna array. HBF technology is a combination of ABF and DBF technologies, featuring both multiple digital processing channels and multiple analog phase shifters. Therefore, for hybrid beamforming technology, the function of the above-mentioned spatial transmission filter can be implemented by multiple phase shifters corresponding to multiple array elements in the antenna array and multiple digital processing channels. However, the present application is not limited to this, and the above-mentioned spatial transmission filter can also be implemented by other technologies.

[0090] It can be understood that one or more antenna ports forming a beam can be regarded as an antenna port set or an antenna port group. For the sake of convenience, the following text uniformly refers to a beam formed by one antenna port, and the one or more digital ports forming a beam are called a port group.

[0091] In one implementation, multiple digital channels are digitally weighted identically across the entire frequency band, which has an effect similar to analog beamforming.

[0092] In another implementation, the digital channel (or digital weighting) can be divided into multiple levels. The first level performs the same digital weighting for the entire frequency band, and the second level performs weighting for the sub-band. The effect is also equivalent to hybrid beamforming. Figure 3 A schematic diagram of hybrid beamforming (or digital beamforming) is shown. Figure 3 As shown, the digital channels are evenly divided into K1 (K1 is a positive integer) groups (or, K1 sub-arrays, K1 port groups). The number of digital channels in each group (or, sub-array, port group) is the same, for example, K2 (K2 is a positive integer). Digital beamforming and analog beamforming can be considered two-stage beamforming. The first-stage beamforming is analog beamforming, and the weight of the first-stage beamforming is W0 = [W 0, 0W 0,1 …W 0,K2-1 ], where the K2 elements correspond to the K2 digital channels. The first-level beamforming weights are broadband, and each group uses the same first-level weight, namely W0. The second-level beamforming is digital beamforming, and the second-level beamforming weight is W1 = [W 1,0 W 1,1 …W 0,K1-1 ], where K1 elements correspond to K1 digital channels. The second-level beamforming weights are sub-band, and the second-level weights are different between different groups (or sub-arrays, port groups), that is, the weight matrix corresponding to the digital channel is or in, represents the Kronecker product, Figure 3 in represents the weighted vector corresponding to the first-level weights. As can be seen, different weighted vectors result in different beam directions. Therefore, network devices can adjust the beam direction by adjusting the weighted vector.

[0093] 3. Reference signal: can be used for channel measurement, channel estimation or beam quality monitoring, etc. According to the LTE or NR protocol, the uplink reference signal may include, for example, a sounding reference signal (SRS), a physical uplink control channel (PUCCH)-demodulation reference signal (DMRS) (PUCCH-DMRS), a physical uplink shared channel (PUSCH)-demodulation reference signal (PUSCH-DMRS), a phase noise tracking reference signal (PTRS), an uplink positioning RS, etc.; the downlink reference signal may include, for example, a synchronization signal block (SSB), a physical downlink control channel (PDCCH)-demodulation reference signal (PDCCH-DMRS), a physical downlink shared channel (PDSCH)-demodulation reference signal (PDSCH-DMRS), PTRS, a channel status information reference signal (CSI-RS), a cell reference signal (CRS) in LTE, and a time / frequency domain tracking synchronization signal (TRS) in NR. signal, TRS), downlink positioning signal (positioning RS), etc.

[0094] The reference signal in the embodiments of the present application is mainly used for channel measurement, and may be, for example, a CSI-RS used in downlink channel measurement, an SRS used in uplink channel measurement, or other reference signals that can be used for channel measurement. This application does not limit this.

[0095] A specific application scenario is as follows: In frequency division duplex (FDD) communication scenarios, because uplink and downlink channels are not reciprocal or cannot be guaranteed, network devices typically send CSI-RS to terminal devices. The terminal device measures the received CSI-RS, obtains the CSI of the downlink channel, and feeds it back to the network device. Based on this CSI, the network device can decide on the resources, modulation and coding scheme (MCS), and precoding configuration for scheduling the terminal device's downlink data channel.

[0096] Exemplarily, CSI may include at least one of the following: precoding matrix indicator (PMI), channel quality indicator (CQI), rank indicator (RI) and channel state information reference signal resource indicator (CSI-RS resource indicator, CRI), layer indicator (LI), reference signal received power (RSRP), synchronization / broadcast signal block resource index (SSBRI), etc.

[0097] RI is the rank of the channel matrix, reflecting the maximum number of data streams allowed for downlink transmission under current channel conditions. LI is the number of data layers. The specific CSI quantities reported by the terminal device are determined by configuration, as described in "CSI-Report Configuration (CSI-ReportConfig)" below.

[0098] Precoding and Codebooks: In a multiple-input, multiple-output (MIMO) communication system, the mathematical expression for communication is y = Hx + n, where y is the received signal, H is the MIMO channel, x is the transmitted signal, and n is the noise. In a communication system with multiple antennas, the signals from multiple transmitting antennas are superimposed on any receiving antenna. Therefore, the method used by the transmitter to transmit signals affects system performance, and recovering the transmitted signal at the receiver is often complex. In this context, precoding is used to reduce system overhead and maximize MIMO system capacity, while also reducing the complexity of the receiver's implementation of mitigating inter-channel interference. The mathematical expression is y = HPx + n, where P is the precoding matrix (or vector). To simplify implementation complexity, P can be selected from a predefined set of matrices (or vectors), called a codebook. This method is also known as a codebook-based transmission method.

[0099] The codebook includes the PMI index and the precoding matrix. Each PMI corresponds to the precoding matrix one-to-one. The corresponding precoding matrix can be determined based on the PMI fed back by the CSI. For the "Release 15" protocol proposed by 3GPP, in the type I codebook feedback, the precoding matrix corresponding to one transmission layer and one subband to be fed back can be expressed as W: W = W1W2, where the dimension of W is P CSI-RS ×N3, W1 is the wideband precoding matrix, and its dimension is P CSI-RS ×2L, W2 is the subband precoding matrix, and its dimension is 2L×N3. CSI-RS N represents the number of CSI-RS ports, N3 represents the number of subbands or PMIs, and L represents the number of transmitted data streams. PMI may specifically include feedback on precoding matrices for different transmission layers and subbands.

[0100] When the number of CSI-RS ports is less than or equal to 2, the codebook feedback parameters (including codebook index and number of layers / streams) are as follows:

[0101] Table 1

[0102]

[0103]

[0104] When the number of CSI-RS ports is greater than 2, the codebook's precoding matrix, that is, the number of weights, increases exponentially with the number of CSI-RS ports and layers. Therefore, the codebook is no longer suitable for enumeration. Instead, it is generated according to certain rules based on relevant parameter configurations. In other words, the codebook can be determined based on the relevant parameter configurations.

[0105] Taking the type I codebook as an example, when codebookmode=1, the codebook can be determined according to the following three steps: 1. Determine the spatial beam set, that is, the set of all weights in a codebook; 2. Select the wideband beam group, that is, determine the wideband precoding matrix W1; 3. Beam selection and phase quantization adjustment, that is, determine the subband precoding matrix W2.

[0106] The spatial beam set is determined by the parameter configuration in Table 2:

[0107] Table 2

[0108]

[0109] In Table 2, N1 represents the number of logical antenna ports in a certain direction of the same polarization, generally referring to the horizontal direction; N2 represents the number of logical antenna ports in another direction of the same polarization, generally referring to the vertical direction; O1 represents the discrete Fourier transform (DFT) oversampling multiple in the direction of N1 (horizontal direction); O2 represents the DFT oversampling multiple in the direction of N2 (vertical direction).

[0110] As shown in Table 2, CSI-RS = 16. For the same-level logical antenna port number, the only possible combinations in the horizontal and vertical directions are (4, 2) and (8, 1), as shown in the table above. When N1 is 4 and N2 is 2, beamforming can generate N1 × N2 weight vectors with 4 horizontal dimensions and 2 vertical dimensions. These weight vectors are orthogonal, meaning that the beams formed by these weighted vectors do not interfere with each other.

[0111] The physical significance of O1 and O2 lies in the fact that DFT oversampling increases the number of weight vectors in the horizontal and vertical directions, thereby generating more weight vectors. The values of O1 and O2 also determine the horizontal and vertical beam density when the antenna configuration is fixed, that is, when N1 and N2 are determined. Larger values of O1 and O2 result in smaller beam steps during beam scanning and higher accuracy. However, this comes at the cost of orthogonality between the weight vectors, meaning that interference exists between the beams formed by weighting these weight vectors.

[0112] Figure 4 Figure 1 is a schematic diagram of a spatial beam index under 16 CSI-RS ports. Figure 4As shown in the figure, (N1, N2) takes the value of (4, 2), so the spatial beam formed has a horizontal dimension of 4 and a vertical dimension of 2. (O1, O2) takes the value of (4, 4), and each dot corresponds to a weight vector after DFT oversampling. Since beams in different directions can be formed by weighting with different weight vectors, Figure 4 Each dot in the image corresponds to a different DFT beam. The weight vectors corresponding to the black dots are orthogonal, meaning they do not interfere with each other. However, the weight vectors corresponding to the black and shaded dots are no longer orthogonal, meaning they interfere with each other.

[0113] like Figure 4 As shown, the oversampled DFT beam index can be determined according to the position of each dot in the horizontal and vertical directions. l represents the DFT beam index in the horizontal direction, and m represents the DFT beam index in the vertical direction. For example, (l, m) = (0, 0) is used to indicate Figure 4 The dots marked with “1” in the shown spatial beams correspond to the DFT beams.

[0114] The wideband precoding matrix W1 is formed by oversampling the DFT matrix. That is, the DFT matrix is oversampled in space to obtain the beamforming weights with the required accuracy. The weight vectors for the lth and mth beams in the horizontal and vertical directions satisfy the following expressions:

[0115]

[0116]

[0117] Among them, v l is the weight vector in the horizontal direction, and its length is N1. The specific number of weight vectors in the horizontal direction is determined by the number of values of l, that is, l also represents the weight selected in the horizontal direction.

[0118] u m is the weight vector in the vertical direction, and its length is N2. The specific number of vectors in the vertical direction is determined by the number of values of m, that is, m also represents the weight selected in the vertical direction.

[0119] After confirming the weight groups in the horizontal and vertical directions, the selected weight group is determined. l and u m The Kronecker product of the result is only the weight result on one set of polarized antennas. Usually there will be a certain phase deviation on the other set of polarized antennas. The phase deviation is determined by W2. Therefore, the final expression of W1 is v l and um The form of the latter sub-block diagonal matrix in the Kronecker product of .

[0120] The weight vector of the (l, m)th beam satisfies the following expression:

[0121]

[0122] According to the above expression, all possible values of l and m are calculated to determine the beam corresponding to W1. The beam corresponding to W1 may be divided into two cases:

[0123] (1) Multiple oversampled DFT beams, and any two beams are not orthogonal to each other, and the overall l,m express;

[0124] (2) Multiple orthogonal DFT beams, through v l,m 、v l′,m′ 、v l″,m″ ...distinguishing between multiple beams.

[0125] Accordingly, W1 satisfies the following expression:

[0126]

[0127] Where N represents the number of CSI-RS ports, L represents the number of streams, The power normalization coefficient is used to ensure that the total power on the antenna port remains unchanged before and after beamforming weighting. The number of CSI-RS ports is the number of rows of the wideband precoding matrix W1, which is v l,m Twice the number of rows; the non-zero subdiagonal block in the upper left corner of W1, that is, v l,m v l′,m′ …in the column vector group composed of , each column represents a beam in a specific direction of the same polarization antenna.

[0128] When the number of CSI-RS ports is greater than 2, the PMI index includes the wideband indication i1 and the subband indication i2. The wideband indication i1 is a composite index, and the basic definition of the wideband indication i1 is as follows:

[0129]

[0130] Among them, i 1,1 The first DFT beam fed back to the terminal device is Figure 4 The corresponding horizontal coordinate position in the spatial beam index diagram shown is equivalent to the above horizontal index l; i 1,2 For the DFT beam Figure 4 The corresponding vertical coordinate position in the spatial beam index diagram shown is equivalent to the vertical index m; i1,3 is the offset of another DFT beam fed back by the terminal device relative to the first DFT beam, i 1,3 It includes the offset in the horizontal and vertical directions; L represents the number of layers. It should be noted that in the type I codebook, the number of streams and the number of layers correspond to the same value.

[0131] When the number of layers L is 2, i 1,3 The offsets in the horizontal and vertical directions can be selected according to Table 3.

[0132] Table 3

[0133]

[0134] In Table 3, the value corresponding to k1 is the offset of another DFT beam relative to the first DFT beam in the horizontal direction, and the value corresponding to k2 is the offset of another DFT beam relative to the first DFT beam in the vertical direction.

[0135] When the number of layers L is 3 or 4, and the number of CSI-RS ports is less than 16, i 1,3 The offsets in the horizontal and vertical directions can be selected according to Table 4.

[0136] Table 4

[0137]

[0138]

[0139] It is understandable that for each CSI-RS resource, the terminal device needs to calculate the autocorrelation covariance matrix R of the corresponding frequency domain channel coefficient. hh A DFT beam is selected from the spatial beam set to determine the wideband precoding matrix W1.

[0140] The subband precoding matrix W2 is used to quantize and adjust the phase difference of the weights on the other set of polarized antennas. The subband indicator i2 fed back by the terminal device corresponds to W2. When codebookmode = 1 and the number of layers L is 1, the PMI content fed back by the terminal device to the network device is shown in Table 5:

[0141] Table 5

[0142]

[0143] in, That is, the precoding matrix determined by the broadband precoding matrix W1 and the subband precoding matrix W2 when the number of layers L is 1. Specifically, P CSI-RS is the number of CSI-RS ports, according to the i contained in i1 fed back by the terminal device1,1 and i 1,2 The horizontal index l and vertical index m of the DFT beam in the spatial domain beam index map can be determined, thereby determining the weight vector of the (l, m)th beam. n is the value corresponding to i2 fed back by the terminal device.

[0144] In the case of codebookmode=1, when the number of layers v is 2, the PMI content fed back by the terminal device to the network device is shown in Table 6:

[0145] Table 6

[0146]

[0147] in, That is, when the number of layers L is 2, the precoding matrix is determined based on the broadband precoding matrix W1 and the subband precoding matrix W2. k1 and k2 are the i in Table 3. 1,3 Contains the horizontal and vertical offsets, v l′,m′ Used to distinguish from v l,m The other parameters are consistent with those in Table 5 and will not be described again here.

[0148] In the case of codebook mode = 1-2, when the number of layers L is 3 and the number of CSI-RS ports is less than 16, the PMI content fed back by the terminal device to the network device is as shown in Table 7:

[0149] Table 7

[0150]

[0151] in, That is, when the number of layers L is 3 and the number of CSI-RS ports is less than 16, the precoding matrix is determined based on the broadband precoding matrix W1 and the subband precoding matrix W2. k1 and k2 are the i in Table 4. 1,3 The included horizontal and vertical offsets, and the remaining parameters are consistent with Table 5 and Table 6 and are not repeated here.

[0152] When the number of layers L and the number of CSI-RS ports are other possible values, the specific method for determining the precoding matrix may refer to the relevant content in 3GPP technical specification (TS) 38.214, which will not be repeated here.

[0153] 4. Reference signal resources: These can be used to configure reference signal transmission properties, such as time-frequency resource locations, port mappings, power factors, and scrambling codes. For details, refer to the reference signal resource sections in 3GPP TS 38.211 and 38.331. Transmitters can send reference signals based on reference signal resources, and receivers can receive reference signals based on reference signal resources.

[0154] 5. Reference signal configuration: Reference signal configuration can include reference signal resource configuration and reference signal reporting configuration. The following uses CSI-RS configuration as an example to introduce.

[0155] The two most important parts of the CSI-RS configuration are "CSI-ReportConfig" and "CSI-ResourceConfig." It should be understood that "CSI-ReportConfig" and "CSI-ResourceConfig" are simply names used for ease of description and may be named otherwise, and this application does not limit them.

[0156] Among them, "CSI-ReportConfig" can be used to configure parameters related to CSI reporting, such as "report configuration identifier (ReportConfigId)", "report configuration type (reportConfigType)", "report quantity (reportQuantity)," etc. "reportConfigId" can be used to mark "CSI-ReportConfig", that is, one "reportConfigId" can correspond to one "CSI-ReportConfig". "reportConfigType" is used to configure the reporting type, which can be specifically divided into: periodic reporting, semi-continuous reporting and non-periodic reporting. "reportQuantity" can be used to configure the reported information, such as: CRI, PMI, RI, LI, CQI, RSRP, RSRQ, SNR, SINR, etc. Different information can be reported through different configurations.

[0157] "CSI-ResourceConfig" can be used to configure CSI-RS resource-related information, such as the "CSI resource configuration identifier (CSI-ResourceConfigId)" and the CSI-RS resources used for measurement. Among them, "CSI-ResourceConfigId" is the identifier of the "CSI resource configuration (CSI-ResourceConfig)", which is used to mark the "CSI-ResourceConfig" and can be associated with "CSI-ReportConfig" through this variable.

[0158] For example, through the three-level high-level parameters "CSI-ResourceConfig"-"CSI-RS resource set (CSI-RS-ResourceSet)"-"CSI-RS-Resource", the network device can configure one or more CSI-RS resource sets for each terminal device, and each CSI-RS resource set includes one or more CSI-RS resources.

[0159] Each CSI-RS resource can be identified by a "CSI-RS resource identifier (CSI-RS-ResourceId)". The identifiers of the CSI-RS resources in a CSI-RS resource set are not necessarily numbered sequentially. For example, the identifiers of the resources in a CSI-RS resource set sorted by beam index order (such as CSI-RS-ResourceId) include {002, 004, 008, 003, 005}, where 002 corresponds to resource index 0, 004 corresponds to resource index 1, 008 corresponds to resource index 2, 003 corresponds to resource index 3, and 005 corresponds to resource index 4. The resource index is used to indicate the transmission order of the CSI-RS resources. It should be understood that the resource index is only an exemplary naming.

[0160] When the terminal device performs measurement reporting based on the above configuration, the CRI in the CSI is used to indicate the resources in the current measured CSI-RS resource set. s >1 CSI-RS resource, CRI k (k is greater than or equal to 0) corresponds to the k+1th CSI-RS resource in the CSI-RS resource set for channel measurement, where k can be the CRI value, or k can be the index of the resource indicated by the CRI.

[0161] Table 8 shows the format of some fields in the measurement report information.

[0162] Table 8

[0163]

[0164] As shown in Table 8, the CRI field is used to carry CRI and to indicate the CSI-RS resource to be reported. Its length is Indicates the number of CSI-RS resources in resource set s, Indicates rounding up. The SSBRI field is used to carry SSBRI, which is used to indicate the SSB resource to be reported (such as the resource identifier). Its length is Indicates the number of SSB resources in resource set s. The terminal device can report one or more of CRI or SSBRI.

[0165] RSRP can be reported differentially. For the maximum RSRP value, its absolute value can be reported using 7-bit quantization, as shown in the RSRP field in the table. The RSRP indicated by this field corresponds to the reference signal resource corresponding to the reference signal with the highest received power; other RSRPs can be reported using 4-bit quantization to report the difference between it and the maximum RSRP value, as shown in the Differential RSRP field in the table.

[0166] The above description briefly explains the measurement results using PMI, CRI, SSBRI, RSRP and other reported quantities as examples, but this does not limit the present application in any way. The present application does not limit the specific content of the measurement results and their indication method.

[0167] In the embodiment of the present application, CSI may be carried in uplink control information (UCI) and transmitted through a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

[0168] Under the HBF architecture, a reference signal resource (such as a CSI-RS resource) corresponds to an analog beam, a reference signal resource is used to send a reference signal, and reference signal resources (such as CSI-RS resources) are time-division transmitted using different beams. The network device can communicate with the terminal device through different analog beams. Only when the analog beam is aligned with the communication target can the quality of the communication signal be better. The process of selecting an analog beam from multiple different analog beams is called beam scanning or beam training. Considering that the network device can adjust the beam direction by adjusting the weighting vector, an exemplary beam scanning method is as follows: the network device sends multiple reference signals to the terminal device through analog beams in different directions, and the terminal device measures the resources of multiple reference signals (such as CSI-RS resources) and reports the CSI corresponding to the resources. Based on the CSI fed back by the terminal device, the analog beam with the highest performance adaptability can be determined from multiple analog beams.

[0169] For ease of description, the above-mentioned reference signal resources are collectively referred to as resources below.

[0170] Figure 5 This is a schematic diagram of signaling transmission when performing channel measurement between network equipment and terminal equipment. Figure 5 As shown in the figure, when there are K simulated beams, the network device sends CSI-RS resource #0 to CSI-RS resource #(K-1) in a time-division manner. Accordingly, the terminal device reports CSI for each of the K CSI-RS resources. That is, the number of reported CSI is positively correlated with the number of CSI-RS resources. When the number of simulated beams is larger, the required feedback overhead is also greater.

[0171] In response to the above-mentioned problem of high feedback overhead, the present application provides a channel state information feedback method and related apparatus, aiming to reduce feedback overhead.

[0172] The technical concept of this application is: the simulated beams correspond one-to-one to the resources, and based on the correlation between the simulated beams, the common CSI parameters of multiple resources corresponding to multiple simulated beams are calculated, and the common CSI parameters are used as the same CSI parameters corresponding to multiple resources, so as to avoid the terminal device from feeding back all CSI parameters for each resource, thereby reducing the feedback overhead.

[0173] In the following embodiments, the interaction between the terminal device and the network device to implement downlink measurement is used as an example for description. It should be understood that the present application is not limited to this, and for example, it can also be applied to uplink measurement process.

[0174] It should also be understood that the above-mentioned terminal device can be replaced by a component configured in the terminal device (such as a chip, a chip system, a processor, etc.), or a logic module or software that can realize all or part of the functions of the terminal device; the above-mentioned network device can also be replaced by a component configured in the network device (such as a chip, a chip system, a processor, etc.), or a logic module or software that can realize all or part of the functions of the network device.

[0175] Figure 6 This is a flow chart of a channel state information feedback method provided by one embodiment of the present application. Figure 6 As shown, the channel state information feedback method may include steps S601 to S603.

[0176] S601: A network device sends P reference signals to a terminal device, where P is an integer greater than 1. Correspondingly, the terminal device receives the P reference signals from the network device.

[0177] In the HBF architecture, the network device sends P simulated beams in different directions to the terminal device. Each simulated beam corresponds to a resource. The network device configures P resources in the resource set and sends reference signals through the P resources. It is understandable that during the beam scanning process, the simulated beam with the highest degree of adaptability is selected for the terminal device from the P simulated beams based on the fed-back CSI. Therefore, in the embodiment of the present application, the network device sends the reference signal on the resource, and the reference signal corresponds to the resource one-to-one.

[0178] The type of the above-mentioned P reference signals may be, for example, CSI-RS, or SSB, PDCCH-DMRS, PDSCH-DMRS, PTRS, CRS in LTE, TRS in NR, downlink positioning signal, etc. This application does not limit the type of reference signal.

[0179] In one possible implementation, the P reference signals may be sent in a time-division manner, i.e., P reference signals are sent on different time domain resources (time slots or orthogonal frequency division multiplexing (OFDM) symbols). Different reference signals correspond to different antenna ports. As mentioned above, the antenna port may be an analog antenna port or a reference signal port group, etc.

[0180] For example, the specific implementation of S601 may be: the DU corresponding to the network device sends the P reference signals through the RU. In an O-RAN system, the specific implementation of step 601 may be: the O-DU corresponding to the network device sends the P reference signals through the O-RU.

[0181] For ease of understanding, the following description uses CSI-RS as an example of a reference signal.

[0182] S602, the terminal device determines the first channel state information CSI based on N reference signals among P reference signals, the first CSI includes a first RI and / or a first PMI, the first RI is the RI corresponding to the N reference signals, the first PMI is the PMI corresponding to the N reference signals, the N reference signals correspond one-to-one to the N resources in the resource set, and N is an integer greater than 1.

[0183] In this step, the terminal device can determine the channel based on the received reference signal and measure it to obtain CSI.

[0184] Exemplarily, the terminal device reports the first CSI corresponding to N resources out of P resources configured in the CSI-RS resource set, where the value of N is 1, 2, ..., any value in P. For example, if the value of P is 8, the value of N can be any value from 1 to 8.

[0185] In some implementations, the value of N can be determined based on the configuration information of the network device. As an example, before step S601, Figure 7 As shown in step S600-1 in , the network device sends reference signal configuration information to the terminal device. Accordingly, the terminal device receives the reference signal configuration information from the network device. The reference signal configuration information can be carried in the RRC message. The reference signal configuration information may include reference signal resource configuration information and reference signal reporting configuration information. The network device can directly indicate the value of P and the value of N through the reference signal resource configuration information. It can be understood that CRI is used to indicate the resources in the CSI-RS resource set, that is, CRI corresponds to the resources in the CSI-RS resource set one-to-one. Therefore, after determining the value of N according to the configuration information of the network device, it is equivalent to determining the number of CRIs (and / or PMI / RI / CQI and other fields corresponding to the N resources) in the CSI corresponding to the N resources reported by the terminal device.

[0186] As another possible example, the value of N indicated in the configuration information of the network device is actually the maximum optional value N of N. max , the terminal device is based on the maximum optional value N max , determine a value less than or equal to the maximum optional value N max N, for example: the maximum optional value N indicated in the configuration information of the network device max =4, the terminal device can determine an arbitrary value from 1, 2, 3, 4 as the value of N.

[0187] In some implementations, the terminal device reports capability information to the network device. Through the capability information, the value of N supported by the terminal device or the maximum optional value N of N can be implicitly indicated. max . As an example, the terminal device can report the RI in the historical CSI. The RI reflects the maximum number of data streams allowed to be transmitted under the current channel conditions. The value of RI is negatively correlated with the value of N supported by the terminal device or the maximum optional value N of N max . For example: RI ≤ 4 in the historical CSI reported by the terminal device is equivalent to implicitly indicating that the value of N supported by the terminal device or the maximum optional value N of N max is 6. If 4 < RI ≤ 8 in the historical CSI reported by the terminal device, then the value of N supported by the terminal device or the maximum optional value N of N max is 4.

[0188] In some implementations, N CSI-RSs correspond to N resources one by one, and the terminal device can measure each CSI-RS to obtain the CSI parameters corresponding to each CSI-RS. As an example, when the network device sends CSI-RS through N CSI-RS resources, it first needs to configure the CSI-RS resources through the reference signal resource configuration information. The terminal device can determine the CRI corresponding to each resource in the N CSI-RS resources according to the reference signal resource configuration information.

[0189] In some implementations, after the terminal device determines the N CRIs corresponding to the N resources, for the N CRIs (or N reference signals), each CRI may correspond to a different rank. The terminal device calculates the signal to interference plus noise ratio (SINR) of each CRI corresponding to each rank, and compares the SINRs corresponding to different ranks with a preset SINR threshold to determine the RI corresponding to each CRI.

[0190] In some implementations, after determining the RI corresponding to the CSI-RS, the terminal device can calculate the PMI corresponding to the CSI-RS based on the protocol according to the introduction of PMI in the aforementioned codebook determination process, which will not be repeated here. It should be noted that, depending on the different CSI reporting formats, PMI can be divided into wideband PMI and / or subband PMI, where the wideband PMI is the PMI of the entire bandwidth corresponding to the CSI-RS resource, and the wideband PMI includes a wideband information field X1 and / or a wideband information field X2. The wideband information field X1 is the indication i1 in the PMI index, and the wideband information field X2 is the i2 corresponding to the entire wideband; the entire bandwidth corresponding to the CSI-RS resource is divided into multiple subbands, and the PMI corresponding to each subband is the subband PMI. The subband PMI includes a subband information field X2, and the subband information field X2 is the i2 corresponding to each subband in the multiple subbands.

[0191] In some implementations, the terminal device can calculate the RI and PMI to measure the SINR of the channel corresponding to the CSI-RS, quantize it, and obtain the CQI sequence. Furthermore, according to 3GPP TS 38.211, the modulation and coding scheme (MCS) corresponding to the CQI sequence can be found.

[0192] In some implementations, the terminal device may calculate the LI corresponding to each of the N CSI-RS resources based on the above CRI, RI, PMI, and CQI.

[0193] In some implementations, considering the correlation between the N simulated beams, the CSI parameters corresponding to the N CSI-RS resources also have a correlation relationship. Therefore, the CSI parameters corresponding to the N CSI-RS resources can be jointly calculated, for example:

[0194] The terminal device reports the CSI corresponding to N CSI-RS resources among the P CSI-RS resources configured in the CSI-RS resource set, and the N CSI-RS resources correspond to N CRIs.

[0195] In some implementations, each CRI may correspond to a different rank. The terminal device calculates the average SINR of the N CRIs corresponding to each rank. For example, if N is 4, there are 4 CRIs corresponding to N CSI-RS resources. When rank = 1, the SINRs corresponding to the 4 CRIs are SINR 1, SINR 2, SINR 3, and SINR 4, respectively. The average SINR of the 4 CRIs is SINR aver_1=(SINR 1 + SINR 2 + SINR 3 + SINR 4) / 4. The terminal device compares the SINR mean of N CRIs corresponding to different ranks with the preset SINR threshold to determine the common RI corresponding to the N CRIs. This RI is the first RI. The first RI contains only one RI. The RI corresponding to each of the N CSI-RS resources is the first RI, which is the common RI corresponding to the N CSI-RS resources.

[0196] In some implementations, when jointly calculating the PMI based on N CRIs and the first RI, the terminal device may add all the autocorrelation covariance matrices of the N frequency-domain channel coefficients corresponding to the N CRIs to obtain the accumulated autocorrelation covariance matrix R hh_sum , R hh_sum Satisfies the following relationship:

[0197]

[0198] in, represents the frequency domain channel coefficient corresponding to the nth resource, Represents the transpose of the frequency-domain channel coefficient corresponding to the n-th resource.

[0199] In some implementations, the terminal device may also calculate the mean of all autocorrelation covariance matrices of the N frequency-domain channel coefficients corresponding to the N CRIs. The mean of the autocorrelation covariance matrix R hh_aver Satisfies the following relationship:

[0200]

[0201] Where N represents the number of resources, represents the frequency domain channel coefficient corresponding to the nth resource, Represents the transpose of the frequency-domain channel coefficient corresponding to the n-th resource.

[0202] For N CSI-RS resources, the terminal device can use the accumulated R hh_sum or mean R hh_aver A DFT beam is selected from the spatial beam set to determine the common wideband PMI and / or common subband PMI corresponding to the N CSI-RS resources. The common wideband PMI includes the common wideband information field X1 and / or the common wideband information field X2, and the common subband PMI includes the common subband information field X2. The common wideband PMI and / or the common subband PMI can be considered the first PMI. The PMI corresponding to each of the N CSI-RS resources is the first PMI.

[0203] In some implementations, the terminal device can measure and obtain the common SINR of the channels corresponding to the N CSI-RSs based on the above first RI and first PMI, and quantize it to obtain the common CQI sequence corresponding to the N CSI-RS resources. In some implementations, the terminal device can also calculate the SINR of the channel corresponding to each CSI-RS resource in the N CSI-RS resources, calculate the average SINR of the N SINRs, and quantize the average SINR to obtain the CQI sequence, which is the common CQI corresponding to the N CSI-RS resources.

[0204] In some implementations, the terminal device may calculate the corresponding common LI in N CSI-RS resources based on the above CRI, the first RI, the first PMI, and the common CQI.

[0205] This application refers to the CSI parameters obtained through the joint calculation as joint CSI parameters. Reporting the joint CSI parameters as common CSI parameters for N resources is referred to as joint reporting. Reporting the joint CSI parameters associated with all N resources, and reporting the CSI parameters for each of the N resources individually, is referred to as independent reporting. Below, any CSI field with the word "joint" indicates that the corresponding CSI parameter is a joint CSI parameter.

[0206] It should be noted that when the terminal device independently reports the PMIs corresponding to N resources, the N PMIs corresponding to the N resources use the same type of codebook, for example, the N PMIs all use a type I codebook or a type II codebook. Accordingly, when the N PMIs use the same type of codebook, the format of the first CSI corresponding to the N resources reported by the terminal device corresponds to the codebook used by the N PMIs.

[0207] It is understandable that before the terminal device jointly calculates the CSI parameters corresponding to the N CSI-RS resources, it first needs to determine whether the simulated beams corresponding to the N CSI-RS resources are correlated.

[0208] In some implementations, the terminal device may calculate the correlation between the channel coefficients corresponding to any two resources among the P resources configured in the CSI-RS resource set. When the correlation between the channel coefficients corresponding to the two resources is greater than or equal to a preset first threshold, the terminal device may jointly calculate the CSI parameters corresponding to the two resources. The correlation between the channel coefficients corresponding to the two resources satisfies the following relationship:

[0209]

[0210] Among them, Corr(B0,B1,n) represents the correlation of the channel coefficient corresponding to resource B0 and the channel coefficient corresponding to resource B1 after being mapped to the two-dimensional DFT beam domain. H(B0,n) represents the channel coefficient of resource B0 mapped to the nth DFT beam, H H (B0,n) is the transpose of H(B0,n), and H(B1,n) represents the channel coefficient of resource B1 mapped to the nth DFT beam.

[0211] According to this implementation, the terminal device can determine N resources from the P resources configured in the CSI-RS resource set, and the correlation between the channel coefficients corresponding to any two resources in the N resources is greater than or equal to the first threshold.

[0212] As an example, the terminal device can calculate the squared generalized cosine similarity (SGCS) between the precoding matrices corresponding to any two resources among the P resources configured in the CSI-RS resource set. When the SGCS between the precoding matrices corresponding to the two resources is greater than or equal to a preset first threshold, the terminal device can jointly calculate the CSI parameters corresponding to the two resources.

[0213] The SGCS between the precoding matrices corresponding to the two resources satisfies the following relationship:

[0214]

[0215] Where r is the stream number, SGCS(r) is the SGCS between the rth streams corresponding to the two resources. In this relation, the bandwidth corresponding to the resource is divided into M SB subbands, m represents M SB The number of each subband in the subbands, represents the m-th reference subband precoding matrix of the r-th stream, and the reference subband precoding matrix is obtained by singular value decomposition (SVD). for The transpose of Represents the m-th subband precoding matrix of the r-th stream fed back by the terminal device.

[0216] It can be understood that the above relationship divides the bandwidth corresponding to the resource into M SB subbands, that is, the above relationship is calculated in subband form. In some implementations, if the calculation is performed in broadband form, the SGCS between the precoding matrices corresponding to the two resources satisfies the following relationship:

[0217]

[0218] in, Represents the reference wideband precoding matrix of the rth stream, the reference wideband precoding matrix is obtained by SVD processing, for The transpose of Represents the wideband precoding matrix of the rth stream fed back by the terminal device. The meanings of the remaining parameters are consistent with those in the relationship when calculating in subband form.

[0219] In this example, the terminal device can determine N resources from the P resources configured in the CSI-RS resource set, and the SGCS between the precoding matrices corresponding to any two resources among the N resources is greater than or equal to the first threshold.

[0220] Exemplarily, when a terminal device reports the first CSI corresponding to N resources out of the P resources configured in a CSI-RS resource set, the PMI in the first CSI uses a type I codebook. Accordingly, the format of the first CSI corresponding to the N resources corresponds to the type I codebook. For the format of reporting the first CSI corresponding to the N resources, refer to Tables 9 to 32 and Tables 33 to 74.

[0221] The first CSI corresponding to N resources can correspond to one or more of the following fields: N CRI, RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, joint subband differential CQI of the first TB, wideband CQI of the second TB, joint wideband CQI of the second TB, subband differential CQI of the second TB, joint subband differential CQI of the second TB, LI, joint LI, combined LI, PMI wideband information field X1, joint PMI wideband information field X1, PMI wideband information field X2, joint PMI wideband information field X2, PMI subband information field X2, joint PMI subband information field X2.

[0222] In the above fields of this application, joint RI can be understood as joint rank indicator or rank joint indicator. Combined RI can be understood as combination rank indicator or rank combination indicator.

[0223] The joint wideband CQI can be understood as a joint wideband channel quality indicator (JWCQI) or a wideband channel quality joint indicator (WCQJI). The joint subband differential CQI can be understood as a joint subband differential channel quality indicator (JSCDQI) or a subband differential channel quality joint indicator (SCDQI).

[0224] The joint LI can be understood as a joint layer indicator or a layer joint indicator. The combined LI can be understood as a combination layer indicator or a layer combination indicator.

[0225] The joint PMI wideband information field X1 can be understood as the joint precoding matrix indicator wideband information field X1, or the precoding matrix joint indicator wideband information field X1. The joint PMI wideband information field X2 can be understood as the joint precoding matrix indicator wideband information field X2, or the precoding matrix joint indicator wideband information field X2. The joint PMI subband information field X2 can be understood as the joint precoding matrix indicator subband information field X1, or the precoding matrix joint indicator subband information field X2.

[0226] Among them, the CSI field with "combination" is used to indicate that this CSI parameter contains N CSI parameters. The first CSI parameter among the N CSI parameters is associated with the first resource among the N resources, the second CSI parameter among the N CSI parameters is associated with the second resource among the N resources, and so on. The Nth CSI parameter among the N CSI parameters is associated with the Nth resource among the N resources. For example, the combined RI corresponds to {1, 2}, indicating that the 2 RIs in the combined RI are associated with 2 resources. The RI associated with the first resource is 1, and the RI associated with the second resource is 2. Or, the combined RI corresponds to {1, 2, 2, 1}, indicating that the 4 RIs in the combined RI are associated with 4 resources. The RI corresponding to the first resource is 1, the RI corresponding to the second resource is 2, the RI corresponding to the third resource is 2, and the RI corresponding to the fourth resource is 4.

[0227] It should be noted that there are also different indication forms for the N CRIs. As an example, the N CRIs can be indicated in the form of CRIk0, CRI k1, ……, CRI k n where k n and n are integers, and k n is used to indicate the index of the P resources configured for the CSI-RS resource set, and the corresponding value of k n is 0 ≤ k n < P, and the corresponding value of n is 0 ≤ n < N.

[0228] In some implementation manners, the above N CRIs can also be indicated in the form of a bitmap of P bits (bit). Each different CRI is mapped to a different bit (bit). When it is necessary to indicate this CRI, the corresponding bit (bit) is set to 1, otherwise it is set to 0. For example: P CSI-RS resources are configured in the CSI-RS resource set, and the P CRIs are mapped to P bits (bit). When P = 8, it is correspondingly mapped to 8 bits (bit). When the 8 bits (bit) are 00000001, the value of N is 1, and 1 resource corresponds to the 8th CRI among the 8 CRIs. When the 8 bits (bit) are 01001101, the value of N is 4, and 4 resources respectively correspond to the 2nd, 5th, 6th, and 8th CRIs among the 8 CRIs.

[0229] It can be understood that the network device needs to determine the indication form of the N CRIs in the first CSI reported by the terminal device. As an example, the network device can determine the indication form of the CRI through the field in the RRC signaling. For example: when CRI_mode = 0, the N CRIs are indicated by CRI k0, CRI k1, ……, CRI k nWhen CRI_mode=1, N CRIs are indicated in the form of a bitmap.

[0230] It should be understood that the "CRI_mode" field here indicates one representation method, and may also be other methods, which is not a limitation of this application.

[0231] The above example is an explicit determination method. In another example, the network device can also implicitly determine the indication method of N CRIs based on the value of N in the N CRIs. When the number of reported CRIs does not exceed 2, the above CRI k0, CRI k1,..., CRI kn are used for indication. Otherwise, a bitmap is used for indication. For example: the CSI-RS resource set is configured with P CSI-RS resources, and the value of P is 8. If the first CSI reported by the terminal device includes 2 CRIs, CRI k0 and CRI k1 are used for indication, occupying 6 bits of data; if the first CSI reported by the terminal device includes 3 CRIs, using CRI k0, CRI k1, and CRI k2 for indication requires 9 bits of data, and using a bitmap for indication occupies 8 bits of data. Therefore, from the perspective of saving overhead, the 3 CRIs in the first CSI are indicated in the form of a bitmap.

[0232] Furthermore, the fields in the first CSI can be divided into a first part (part 1) and a second part (part 2), wherein the first part (part 1) can correspond to one or more of the following fields: N CRIs (e.g., CRI k0, CRI k1, ..., CRI k N-1 ), RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, joint subband differential CQI of the first TB.

[0233] The second part (part 2) can correspond to one or more of the following fields: wideband CQI of the second TB, joint wideband CQI of the second TB, subband differential CQI of the second TB, joint subband differential CQI of the second TB, LI, joint LI, combined LI, PMI wideband information field X1, joint PMI wideband information field X1, PMI wideband information field X2, joint PMI wideband information field X2, PMI subband information field X2, joint PMI subband information field X2.

[0234] It should be noted that part 2 also supports both wideband and subband reporting. Wideband reporting refers to measuring and reporting a single value across the entire configured bandwidth. The reported value represents the entire frequency bandwidth. Subband reporting divides the entire configured bandwidth into multiple subbands, measuring and reporting a single value for each subband. Each reported value represents a specific bandwidth segment.

[0235] Accordingly, the second part (part 2) reported in broadband form may correspond to one or more of the following fields: broadband CQI of the second TB, joint broadband CQI of the second TB, LI, joint LI, combined LI, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, joint PMI broadband information field X2.

[0236] The second part (part 2) reported in subband form may correspond to one or more of the following fields: subband differential CQI of the second TB, joint subband differential CQI of the second TB, PMI subband information field X2, and joint PMI subband information field X2.

[0237] The report number corresponding to the first CSI is #0. The format of the first part (part 1) can be referred to as shown in the following Tables 9 to 32. The first part (part 1) can correspond to one or more of the following fields: N CRIs, RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, and joint subband differential CQI of the first TB.

[0238] Among them, the N CRIs in Tables 9 to 20 are CRI k0, CRI k1, ..., CRI k n Indicated in the form of 0≤k n <P,0≤n<N。

[0239] Table 9

[0240]

[0241]

[0242] As shown in Table 9, the first part (part 1) can correspond to N CRIs, RIs, the wideband CQI of the first TB, and the subband differential CQI of the first TB. Each CSI parameter in Table 9 is reported independently. Among them, the subband differential CQI is a collection of multiple subband CQIs. The subband differential CQI in the first TB is associated with the corresponding resource in the N CSI-RS resources in ascending order of subband number.

[0243] Table 10

[0244]

[0245] As shown in Table 10, the first part (part 1) may correspond to N CRIs, RIs, the wideband CQI of the first TB, and the joint subband differential CQI of the first TB, that is, the joint subband differential CQI of the first TB is a joint CSI parameter, and the subband differential CQI in the first TB corresponding to each CSI-RS resource in the N CSI-RS resources is the joint subband differential CQI in the first TB in Table 10.

[0246] Table 11

[0247]

[0248] As shown in Table 11, the first part (part 1) may correspond to N CRIs, RIs, the joint wideband CQI of the first TB, and the subband differential CQI of the first TB, that is, the joint wideband CQI of the first TB is the joint CSI parameter, and the wideband CQI in the first TB corresponding to each CSI-RS resource in the N CSI-RS resources is the joint wideband CQI in the first TB in Table 11.

[0249] Table 12

[0250]

[0251]

[0252] As shown in Table 12, the first part (part 1) can correspond to N CRIs, RIs, the joint wideband CQI of the first TB, and the joint subband differential CQI of the first TB. The joint wideband CQI of the first TB and the joint subband differential CQI of the first TB are consistent with the above table and are joint CSI parameters.

[0253] Table 13

[0254]

[0255] As shown in Table 13, the first part (part 1) may correspond to N CRIs, a combined RI, the wideband CQI of the first TB, and the subband differential CQI of the first TB. The combined RI may be associated with the N CSI-RS resources as shown in Table 13. In some implementations, the combined RI format may also be: N RIs are associated with the N CSI-RS resources, where the first to Nth RIs are associated with the first to Nth resources of the N CSI-RS resources (if reported).

[0256] The combined RI includes N RIs. The first RI to the Nth RI are associated with the first resource to the Nth resource among the N CSI-RS resources. That is, the first RI is associated with the first resource among the N resources, the second RI is associated with the second resource among the N resources, and so on. The Nth RI is associated with the Nth resource among the N resources.

[0257] Table 14

[0258]

[0259] As shown in Table 14, the first part (part 1) can correspond to N CRIs, the combined RI, the wideband CQI of the first TB, and the joint subband differential CQI of the first TB. The combined RI is consistent with Table 13, containing N RIs corresponding to N resources. The joint subband differential CQI of the first TB is consistent with the previous table and is a joint CSI parameter.

[0260] It should be understood that the format of the combined RI in Table 14 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0261] Table 15

[0262]

[0263] As shown in Table 15, the first part (part 1) can correspond to N CRIs, combined RI, joint wideband CQI for the first TB, and subband differential CQI for the first TB. The combined RI is consistent with Table 13, containing N RIs corresponding one-to-one to N resources. The joint wideband CQI for the first TB is consistent with the previous table and is a joint CSI parameter.

[0264] It should be understood that the format of the combined RI in Table 15 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0265] Table 16

[0266]

[0267] As shown in Table 16, the first part (part 1) can correspond to N CRIs, combined RI, joint wideband CQI for the first TB, and joint subband differential CQI for the first TB. The combined RI is consistent with Table 13 and contains N RIs corresponding to N resources. The joint wideband CQI for the first TB and the joint subband differential CQI for the first TB are consistent with the previous table and are joint CSI parameters.

[0268] It should be understood that the format of the combined RI in Table 16 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0269] Table 17

[0270]

[0271]

[0272] As shown in Table 17, the first part (part 1) can correspond to N CRIs, joint RIs, the wideband CQI of the first TB, and the subband differential CQI of the first TB. The joint RI in Table 17 is a joint CSI parameter. The joint RI is the first RI calculated according to the aforementioned joint calculation method. The joint RI is associated with N CSI-RS resources. The RI corresponding to each CSI-RS resource in the N CSI-RS resources is the joint RI shown in Table 17.

[0273] Table 18

[0274]

[0275] As shown in Table 18, the first part (part 1) can correspond to N CRIs, joint RI, wideband CQI of the first TB, and joint subband differential CQI of the first TB. The joint RI is consistent with Table 17, and the joint subband differential CQI of the first TB is consistent with the previous table, which is a joint CSI parameter.

[0276] Table 19

[0277]

[0278] As shown in Table 19, the first part (part 1) can correspond to N CRIs, joint RI, joint wideband CQI of the first TB, and subband differential CQI of the first TB. The joint RI is consistent with Table 17, and the joint wideband CQI of the first TB is consistent with the previous table, which is a joint CSI parameter.

[0279] Table 20

[0280]

[0281]

[0282] As shown in Table 20, the first part (part 1) can correspond to N CRIs, joint RI, joint wideband CQI for the first TB, and joint subband differential CQI for the first TB. The joint RI is consistent with Table 17, and the joint wideband CQI for the first TB and joint subband differential CQI for the first TB are consistent with the aforementioned tables and are joint CSI parameters. The N CRIs in Tables 21 to 32 are indicated in the form of a bitmap consisting of P bits.

[0283] It can be understood that, considering that P CSI-RS resources are configured in the CSI-RS resource set, there are P bits in the bitmap of the P CRI mappings, and N CRIs are associated with N bits in the bitmap of the P bits, where N bits that are 1 correspond to the CRIs of the selected N resources.

[0284] Table 21

[0285]

[0286] As shown in Table 21, the first part (part 1) may correspond to N CRIs, RI, the wideband CQI of the first TB, and the subband differential CQI of the first TB, where the N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 9.

[0287] Table 22

[0288]

[0289] As shown in Table 22, the first part (part 1) may correspond to N CRIs, RI, the wideband CQI of the first TB, and the joint subband differential CQI of the first TB, where the N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 10.

[0290] Table 23

[0291]

[0292]

[0293] As shown in Table 23, the first part (part 1) may correspond to N CRIs, RI, the joint wideband CQI of the first TB, and the subband differential CQI of the first TB, where the N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 11.

[0294] Table 24

[0295]

[0296] As shown in Table 24, the first part (part 1) may correspond to N CRIs, RI, the joint wideband CQI of the first TB, and the joint subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 12.

[0297] Table 25

[0298]

[0299] As shown in Table 25, the first part (part 1) can correspond to N CRIs, combined RI, wideband CQI of the first TB, and subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 13.

[0300] It should be understood that the format of the combined RI in Table 25 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0301] Table 26

[0302]

[0303]

[0304] As shown in Table 26, the first part (part 1) can correspond to N CRIs, combined RI, wideband CQI of the first TB, and joint subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 14.

[0305] It should be understood that the format of the combined RI in Table 26 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0306] Table 27

[0307]

[0308] As shown in Table 27, the first part (part 1) can correspond to N CRIs, combined RI, joint wideband CQI of the first TB, and subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 15.

[0309] It should be understood that the format of the combined RI in Table 26 can also be expressed as: N RIs are associated with the above-mentioned N CSI-RS resources, where the first RI to the Nth RI are associated with the first resource to the Nth resource among the above-mentioned N CSI-RS resources (if reported).

[0310] Table 28

[0311]

[0312] As shown in Table 28, the first part (part 1) can correspond to N CRIs, combined RI, joint wideband CQI of the first TB, and joint subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 16.

[0313] Table 29

[0314]

[0315] As shown in Table 29, the first part (part 1) can correspond to N CRIs, joint RI, wideband CQI of the first TB, and subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 17.

[0316] Table 30

[0317]

[0318] As shown in Table 30, the first part (part 1) can correspond to N CRIs, joint RI, wideband CQI of the first TB and joint subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 18.

[0319] Table 31

[0320]

[0321] As shown in Table 31, the first part (part 1) can correspond to N CRIs, joint RI, joint wideband CQI of the first TB and subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 19.

[0322] Table 32

[0323]

[0324] As shown in Table 32, the first part (part 1) can correspond to N CRIs, joint RI, joint wideband CQI of the first TB, and joint subband differential CQI of the first TB, where N CRIs are indicated in the form of a bitmap, and the remaining fields are consistent with Table 20.

[0325] It should be understood that the above Tables 9 to 32 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 9 to 32 fall within the scope of protection of the embodiments of the present application.

[0326] It should be noted that the format of the first part (part 1) shown in Table 9 to Table 32 above corresponds to the type I codebook.

[0327] The format of the second part (part 2) reported in broadband form can be referred to as shown in the following Tables 33 to 68. The second part (part 2) of the broadband form can correspond to one or more of the following fields: broadband CQI of the second TB, joint broadband CQI of the second TB, LI, joint LI, combined LI, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, and joint PMI broadband information field X2. Among them, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, and joint PMI broadband information field X2 correspond to broadband PMI.

[0328] In some implementations, the second part (part 2) of the wideband format may include the wideband CQI of the second TB or the joint wideband CQI of the second TB only when the RI, combined RI, or joint RI corresponding to the resources in the first part (part 1) of Tables 9 to 32 is greater than 4. Tables 33 to 56 include the wideband CQI of the second TB or the joint wideband CQI of the second TB.

[0329] Table 33

[0330]

[0331] As shown in Table 33, the second part (part 2) of the wideband format can correspond to the wideband CQI, LI, PMI wideband information field X1, and PMI wideband information field X2 of the second TB. Each CSI parameter in Table 33 is reported independently. Among them, the LI indicates the column with the strongest energy corresponding to the reported PMI. The second part (part 2) of Table 33 contains N LIs, that is, the N LIs correspond one-to-one with the N CSI-RS resources.

[0332] Table 34

[0333]

[0334] As shown in Table 34, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB, that is, the joint PMI broadband information field X2 is a joint CSI parameter, and the joint PMI broadband information field X2 is the common broadband information field X2 calculated according to the aforementioned joint calculation method. The PMI broadband information field X2 corresponding to each CSI-RS resource in the N CSI-RS resources is the joint PMI broadband information field X2 shown in Table 34.

[0335] The joint PMI wideband information field X2 is a joint indication i2 in a wideband format in the PMI index, and thus one joint PMI wideband information field X2 shown in Table 34 is equivalent to the first PMI.

[0336] Table 35

[0337]

[0338] As shown in Table 35, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB, that is, the joint PMI broadband information field X1 is a joint CSI parameter, the joint PMI broadband information field X1 is the common broadband information field X1 calculated according to the aforementioned joint calculation method, and the PMI broadband information field X1 corresponding to each CSI-RS resource in the N CSI-RS resources is the joint PMI broadband information field X1 shown in Table 35.

[0339] The joint PMI wideband information field X1 is a joint indication i1 of a wideband form in the PMI index, and thus one joint PMI wideband information field X1 shown in Table 35 is equivalent to the first PMI.

[0340] Table 36

[0341]

[0342] As shown in Table 36, the second part (part 2) of the wideband format may correspond to the wideband CQI, LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint PMI wideband information field X1 and the joint PMI wideband information field X2 are consistent with the aforementioned table and are joint CSI parameters.

[0343] Considering the composition of the PMI index, the joint PMI broadband information field X1 and the joint PMI broadband information field X2 in Table 36 can be combined to be regarded as one PMI, which is the first PMI.

[0344] Table 37

[0345]

[0346]

[0347] As shown in Table 37, the second part (part 2) of the wideband format may correspond to the wideband CQI, combined LI, PMI wideband information field X1, and PMI wideband information field X2 of the second TB. The combined LI includes N LIs, and the first LI to the Nth LI are associated with the first resource to the Nth resource among the N CSI-RS resources, that is, the first LI is associated with the first resource among the N resources, the second LI is associated with the second resource among the N resources, and so on. The Nth LI is associated with the Nth resource among the N resources.

[0348] In some implementations, the format of the combined LI in Table 37 may also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0349] Table 38

[0350]

[0351] As shown in Table 38, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 37 and contains N LIs corresponding one-to-one to N resources. The joint PMI wideband information field X2 is consistent with the previous table and is a joint CSI parameter, equivalent to the first PMI.

[0352] It should be understood that the format of the combined LI in Table 38 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0353] Table 39

[0354]

[0355]

[0356] As shown in Table 39, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, joint PMI wideband information field X1, and PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 37 and contains N LIs corresponding one-to-one to N resources. The joint PMI wideband information field X1 is consistent with the previous table and is a joint CSI parameter, equivalent to the first PMI.

[0357] It should be understood that the format of the combined LI in Table 39 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0358] Table 40

[0359]

[0360] As shown in Table 40, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 37 and contains N LIs corresponding one-to-one to N resources. The joint PMI wideband information field X1 and joint PMI wideband information field X2 are consistent with the previous table and are joint CSI parameters, equivalent to the first PMI.

[0361] It should be understood that the format of the combined LI in Table 40 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0362] Table 41

[0363]

[0364] As shown in Table 41, the second part (part 2) can correspond to the wideband CQI, joint LI, PMI wideband information field X1 and PMI wideband information field X2 of the second TB, where the joint LI in Table 41 is a joint CSI parameter, and the joint LI is associated with N CSI-RS resources. The LI corresponding to each CSI-RS resource in the N CSI-RS resources is the joint LI shown in Table 41.

[0365] Table 42

[0366]

[0367] As shown in Table 42, the second part (part 2) of the wideband format may correspond to the wideband CQI, joint LI, PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 41, and the joint PMI wideband information field X2 is consistent with the aforementioned table and is a joint CSI parameter, equivalent to the first PMI.

[0368] Table 43

[0369]

[0370] As shown in Table 43, the second part (part 2) of the wideband format can correspond to the wideband CQI, joint LI, joint PMI wideband information field X1, and PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 41, and the joint PMI wideband information field X1 is consistent with the previous table and is a joint CSI parameter equivalent to the first PMI.

[0371] Table 44

[0372]

[0373] As shown in Table 44, the second part (part 2) of the wideband format corresponds to the wideband CQI, joint LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 41, and the joint PMI wideband information field X1 and joint PMI wideband information field X2 are consistent with the aforementioned table and are joint CSI parameters. The combined joint PMI wideband information field X1 and joint PMI wideband information field X2 in Table 44 can be considered as a single PMI, which is the first PMI.

[0374] Table 45

[0375]

[0376] As shown in Table 45, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 33.

[0377] Table 46

[0378]

[0379] As shown in Table 46, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 34.

[0380] Table 47

[0381]

[0382] As shown in Table 47, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 35.

[0383] Table 48

[0384]

[0385] As shown in Table 48, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 36.

[0386] Table 49

[0387]

[0388] As shown in Table 49, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 37.

[0389] It should be understood that the format of the combined LI in Table 49 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0390] Table 50

[0391]

[0392] As shown in Table 50, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 38.

[0393] It should be understood that the format of the combined LI in Table 50 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0394] Table 51

[0395]

[0396]

[0397] As shown in Table 51, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 39.

[0398] It should be understood that the format of the combined LI in Table 51 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0399] Table 52

[0400]

[0401] As shown in Table 52, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 40.

[0402] It should be understood that the format of the combined LI in Table 52 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0403] Table 53

[0404]

[0405] As shown in Table 53, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 41.

[0406] Table 54

[0407]

[0408] As shown in Table 54, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 42.

[0409] Table 55

[0410]

[0411] As shown in Table 55, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 43.

[0412] Table 56

[0413]

[0414] As shown in Table 56, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 44.

[0415] In some implementations, when the RI, combined RI, or joint RI corresponding to the resources in the first part (part 1) in Tables 9 to 32 is less than or equal to 4, the second part (part 2) of the wideband format does not include the CQI in the second TB. The formats of the second part (part 2) of the wideband format shown in Tables 57 to 68 do not include the CQI in the second TB.

[0416] Table 57

[0417]

[0418] As shown in Table 57, the second part (part 2) of the broadband form can correspond to LI, PMI broadband information field X1 and PMI broadband information field X2. Table 57 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 33 and Table 45.

[0419] Table 58

[0420]

[0421]

[0422] As shown in Table 58, the second part (part 2) of the broadband form can correspond to LI, PMI broadband information field X1 and joint PMI broadband information field X2. Table 58 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 34 and Table 46.

[0423] Table 59

[0424]

[0425] As shown in Table 59, the second part (part 2) of the broadband form can correspond to LI, joint PMI broadband information field X1 and PMI broadband information field X2. Table 59 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 35 and Table 47.

[0426] Table 60

[0427]

[0428] As shown in Table 60, the second part (part 2) of the broadband form can correspond to LI, joint PMI broadband information field X1 and joint PMI broadband information field X2. Table 60 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 36 and Table 48.

[0429] Table 61

[0430]

[0431] As shown in Table 61, the second part (part 2) of the broadband form can correspond to the combined LI, PMI broadband information field X1 and PMI broadband information field X2. Table 61 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 37 and Table 49.

[0432] It should be understood that the format of the combined LI in Table 61 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0433] Table 62

[0434]

[0435] As shown in Table 62, the second part (part 2) of the broadband form can correspond to the combined LI, PMI broadband information field X1 and joint PMI broadband information field X2. Table 62 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 38 and Table 50.

[0436] It should be understood that the format of the combined LI in Table 62 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0437] Table 63

[0438]

[0439] As shown in Table 63, the second part (part 2) of the broadband form can correspond to the combined LI, the joint PMI broadband information field X1 and the PMI broadband information field X2. Table 63 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 39 and Table 51.

[0440] It should be understood that the format of the combined LI in Table 63 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0441] Table 64

[0442]

[0443] As shown in Table 64, the second part (part 2) of the broadband form can correspond to the combined LI, joint PMI broadband information field X1 and joint PMI broadband information field X2. Table 64 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 40 and Table 52.

[0444] It should be understood that the format of the combined LI in Table 64 can also be expressed as: the combined LI is associated with the above-mentioned N CSI-RS resources (if reported).

[0445] Table 65

[0446]

[0447]

[0448] As shown in Table 65, the second part (part 2) of the broadband form can correspond to the joint LI, PMI broadband information field X1 and PMI broadband information field X2. Table 65 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 41 and Table 53.

[0449] Table 66

[0450]

[0451] As shown in Table 66, the second part (part 2) of the broadband form can correspond to the joint LI, PMI broadband information field X1 and the joint PMI broadband information field X2. Table 66 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 42 and Table 54.

[0452] Table 67

[0453]

[0454] As shown in Table 67, the second part (part 2) of the broadband form can correspond to the joint LI, the joint PMI broadband information field X1 and the PMI broadband information field X2. Table 67 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 43 and Table 55.

[0455] Table 68

[0456]

[0457] As shown in Table 68, the second part (part 2) of the broadband form can correspond to the joint LI, the joint PMI broadband information field X1 and the joint PMI broadband information field X2. Table 68 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 44 and Table 56.

[0458] It should be understood that the above Tables 33 to 68 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 33 to 68 fall within the scope of protection of the embodiments of the present application.

[0459] It should be noted that the format of the second part (part 2) of the wideband form shown in Tables 33 to 68 above corresponds to the type I codebook.

[0460] The format of the second part (part 2) reported in subband format can be referenced as shown in Tables 69 to 74 below. The second part (part 2) in subband format can correspond to one or more of the following fields: subband differential CQI of the second TB, joint subband differential CQI of the second TB, PMI subband information field X2, and joint PMI subband information field X2. Among them, PMI subband information field X2 and joint PMI subband information field X2 correspond to subband PMI.

[0461] In some implementations, the second part (part 2) of the subband format may include the subband differential CQI of the second TB or the joint subband differential CQI of the second TB only when the RI, combined RI, or joint RI corresponding to the resources in the first part (part 1) of Tables 9 to 32 is greater than 4. Tables 69 to 72 include the subband differential CQI of the second TB or the joint subband differential CQI of the second TB.

[0462] Table 69

[0463]

[0464] As shown in Table 69, the second part (part 2) in subband form may correspond to the subband differential CQI and PMI subband information field X2 of the second TB, and each CSI parameter in Table 69 may be reported independently.

[0465] In some implementations, when the entire configured bandwidth is divided into multiple subbands and numbered, the subbands can be classified according to the parity of their numerical numbers, with subbands with odd numerical numbers being odd subbands and subbands with even numerical numbers being even subbands. Therefore, the subband differential CQIs of the second TB in Table 69 can be divided into odd subbands and even subbands. The subband differential CQIs of the second TB corresponding to the N even subbands correspond one-to-one with the N CSI-RS resources, and the subband differential CQIs of the second TB corresponding to the N odd subbands correspond one-to-one with the N CSI-RS resources.

[0466] Similarly, the PMI subband information field X2 in Table 69 can also be divided into odd subbands and even subbands. The PMI subband information field X2 corresponding to the N even subbands corresponds one-to-one with the N CSI-RS resources, and the PMI subband information field X2 corresponding to the N odd subbands corresponds one-to-one with the N CSI-RS resources.

[0467] Table 70

[0468]

[0469]

[0470] As shown in Table 70, the second part (part 2) in subband form can correspond to the subband differential CQI and joint PMI subband information field X2 of the second TB, where the joint PMI subband information field X2 is a joint CSI parameter, and the PMI subband information field X2 corresponding to each CSI-RS resource in the N CSI-RS resources is the joint PMI subband information field X2 shown in Table 70.

[0471] The joint PMI subband information field X2 is a joint indication i2 in subband form in the PMI index, so a joint PMI subband information field X2 composed of an odd subband and an even subband shown in Table 70 is equivalent to the first PMI.

[0472] Table 71

[0473]

[0474] As shown in Table 71, the second part (part 2) in subband form can correspond to the joint subband differential CQI and PMI subband information field X2 of the second TB, where the joint subband differential CQI of the second TB is a joint CSI parameter, and the subband differential CQI of the second TB corresponding to each CSI-RS resource in the N CSI-RS resources is the joint subband differential CQI of the second TB shown in Table 71.

[0475] Table 72

[0476]

[0477] As shown in Table 72, the second part (part 2) of the subband format may correspond to the joint subband differential CQI and joint PMI subband information field X2 of the second TB. The joint subband differential CQI and joint PMI subband information field X2 of the second TB is consistent with the aforementioned table and is a joint CSI parameter.

[0478] In some implementations, when the RI, combined RI, or joint RI corresponding to the resources in the first part (part 1) in Tables 9 to 32 is less than or equal to 4, the second part (part 2) of the subband format does not include the CQI in the second TB. The formats of the second part (part 2) of the subband format shown in Tables 73 and 74 do not include the CQI in the second TB.

[0479] Table 73

[0480]

[0481] As shown in Table 73, the second part (part 2) in subband form can correspond to the PMI subband information field X2. Table 73 does not include the subband differential CQI in the second TB or the joint subband differential CQI in the second TB. The remaining fields are consistent with Table 69 and Table 71.

[0482] Table 74

[0483]

[0484] As shown in Table 74, the second part (part 2) in subband form can correspond to the joint PMI subband information field X2. Table 73 does not include the subband differential CQI in the second TB or the joint subband differential CQI in the second TB. The remaining fields are consistent with Table 70 and Table 72.

[0485] It should be understood that Tables 69 to 74 are merely illustrative and should not limit the embodiments of the present application. Reasonable variations or additions to the contents of Tables 69 to 74 resulting in new table contents fall within the scope of protection of the embodiments of the present application.

[0486] It should be noted that the format of the second part (part 2) of the subband form shown in Tables 69 to 74 above corresponds to the codebook of type I.

[0487] When the terminal device reports the first CSI corresponding to N resources, the first part (part 1) shown in Tables 9 to 32 above and the second part (part 2) shown in Tables 33 to 74 can be freely combined.

[0488] In some implementations, the terminal device determines that there is a correlation between the simulated beams corresponding to N CSI-RS resources. Therefore, the N resources in Tables 9 to 74 can be regarded as a resource group with associated characteristics. The terminal device does not need to report the group index of the resource group corresponding to the N resources. It only needs to refer to the format in Tables 9 to 74 and continuously report the CRI corresponding to the N resources in the resource group and the 3I (RI, PMI and CQI) parameters corresponding to the CRI to the network device.

[0489] S603: The terminal device sends the first CSI to the network device. Correspondingly, the network device receives the first CSI from the terminal device.

[0490] It is understandable that the first CSI corresponds to the CSI corresponding to N resources out of the P resources configured in the CSI-RS resource set. After the terminal device receives the reference signals corresponding to the N resources, the terminal device can determine the CSI corresponding to the N resources using the above-mentioned CSI parameter calculation method for the N resources and feed it back to the network device.

[0491] For example, in Figure 2 In the access network device shown, the network device may specifically implement receiving the first CSI as follows: the RU corresponding to the network device receives the first CSI, and the DU processes it. In an O-RAN system, the network device may specifically implement receiving the first CSI as follows: the O-RU corresponding to the network device receives the first CSI, and the O-DU processes it.

[0492] In this embodiment, for N resources out of the P resources configured in the CSI-RS resource set, taking into account the correlation between the simulated beams corresponding to the N resources, the common CSI parameters corresponding to the N resources are obtained through joint calculation, and the common CSI parameters are used as the content in the first CSI for joint reporting, thereby streamlining the information contained in the first CSI and reducing feedback overhead.

[0493] In the above embodiment, the terminal device determines N resources from the P resources configured in the CSI-RS resource set based on the correlation between the corresponding simulated beams, and reports the corresponding first CSI. In some implementations, the network device may group the simulated beams based on the correlation between the simulated beams corresponding to the resources configured in the CSI-RS resource set. It is understandable that the network device grouping the simulated beams is equivalent to grouping the resources corresponding to the simulated beams.

[0494] When a network device sends multiple simulated beams to a terminal device, it can adjust the direction of the simulated beams by adjusting the weighting vector. When there is no third simulated beam between two simulated beams in space, the two simulated beams can be considered to be spatially adjacent. Among the multiple simulated beams, one simulated beam is designated as the reference beam. The multiple simulated beams can be numbered sequentially according to the specified scanning direction. The simulated beams correspond one-to-one to the resources configured in the CSI-RS resource set, so the resources configured in the CSI-RS resource set are also numbered sequentially.

[0495] In some implementations, the network device may group multiple simulated beams in a uniformly adjacent manner. For example, the network device sends P simulated beams, and each time divides N spatially adjacent simulated beams into the same beam group, where N is 2, 4, etc. Accordingly, the network device divides N resources out of the P resources configured in the CSI-RS resource set into the same resource group. Table 75 shows the resource indication corresponding to each resource group in the corresponding resource groups after the P simulated beams are uniformly adjacently grouped. Indicates rounding down.

[0496] Table 75

[0497]

[0498] As shown in Table 75, each resource group contains N resources, and the CRI k of resources in the same group is n The corresponding subscript n in is a continuous value. The network device configures a corresponding group resource indicator (group CRI, GCRI) for each resource group. The resources in the group are associated with the GCRI, that is, the GCRI can indicate the CRI corresponding to each resource in the resource group.

[0499] It is understandable that Figure 7 In step S600-1, the network device can configure the corresponding GCRI for each resource group through the reference signal configuration information. When M group resource indicators are configured in the CSI-RS resource set, the bit width required for indicating the GCRI of the resource group in the resource set is in, Indicates rounding up, which is not limited in this application. The bit length required by GCRI can also be rounded down. For example, the bit width required by GCRI is Alternatively, it may be rounding, etc. In the following description, the bit width required for the parameter field involving rounding up operations can be replaced by rounding down, rounding up, etc., which will not be described in detail here.

[0500] Optionally, the bit width may be replaced by the number of bits, bit width, or bit length.

[0501] Table 76

[0502]

[0503] In some implementations, GCRI is equivalent to a special form of CRI. As an example, a network device transmits eight analog beams, and the corresponding CRI numbers for the eight analog beams are CRI k0, CRI k1, ..., CRI k7. If, according to the above grouping method, the four resources indicated by CRI k0 to CRI k3 are divided into a first resource group, and the four resources indicated by CRI k4 to CRI k7 are divided into a second resource group, then CRI k8 and CRI k9 can be configured. CRI k8 is used to indicate the first resource group, and CRI k9 is used to indicate the second resource group. CRI k8 and CRI k9 are equivalent to GCRI.

[0504] It should be noted that the CRI k corresponding to the resource group n Middle K n The value of should be greater than or equal to the number of resources that need to be grouped, P. For example, in the above example, 8 resources need to be grouped, that is, the value of P is 8, where k in the above CRI number n The values of k0=0, k1=1, k2=2, k3=3, k4=4, k5=5, k6=6, and k7=7 are respectively. Accordingly, the values of k8 and k9 in CRI k8 and CRI k9 should be greater than or equal to 8. For example, the value of k8 can be 8, and the value of k9 can be 9. Accordingly, in this implementation, the bit width of the CRI-related field in the reference signal configuration information can be shown in Table 77:

[0505] Table 77

[0506]

[0507] In Table 20, P represents the total number of configured resources, and M represents the number of groups corresponding to grouping P resources. Indicates rounding up.

[0508] It is understandable that, considering that in some implementations, GCRI is equivalent to a special form of CRI, when GCRI is mentioned below in this application, GCRI can be replaced by CRI.

[0509] In some implementations, the network device may further group multiple simulated beams in a uniformly spaced manner. For example, the network device sends P simulated beams, and each time the simulated beams spaced T apart are divided into the same beam group, and each beam group contains The value of T is 1, 3, etc. Table 78 shows the corresponding values after P simulated beams are evenly spaced and grouped. The resource indication corresponding to each resource group in the resource groups.

[0510] Table 78

[0511]

[0512] As shown in Table 78, each resource group contains N resources, and the adjacent CRI k in the same resource group n The corresponding subscript n difference is (T+1). Similarly, each resource group is configured with a corresponding GCRI, and the resources in the group are associated with the GCRI.

[0513] According to the above PMI introduction, the broadband indication i1 in the PMI index includes i 1,1 and i 1,2 ,i 1,1 Equivalent to the first dimension index of the first beam selected by the corresponding resource, i 1,2 Equivalent to the second dimension index of the first beam selected for the corresponding resource. When the number of layers (streams) L is greater than 1, the broadband indication i1 in the PMI index also includes i 1,3 ,i 1,3 It is used to indicate the offset of other beams selected for the corresponding resource compared to the first beam. It is understandable that the beam selected by the resource in this application is used to indicate the DFT digital beam, not the analog beam.

[0514] In some implementations, the network device may group multiple simulated beams based on historical information. As an example, the historical information in this implementation is the broadband indication i1 of the PMI fed back by the terminal device. The terminal device feeds back the broadband indication i1 of the PMI corresponding to multiple resources to the network device. When the first dimension indexes of the beams selected by two resources are the same or adjacent, the network device may group the two resources into the same resource group. It is understood that the adjacent first dimension index here means that the horizontal coordinate positions corresponding to the DFT beams in the spatial domain beam index set are adjacent.

[0515] For example: the first dimension index i of the DFT beam selected by resource A1,1 is 2, which is equivalent to the DFT beam selected by resource A in Figure 3 The third column of dots at the corresponding horizontal coordinate position in the spatial domain beam index set shown is the first dimension index i of the DFT beam selected by resource B. 1,1 is 3, which is equivalent to the DFT beam selected by resource B in Figure 3 For the fourth column of dots at the corresponding horizontal coordinate positions in the spatial beam index set shown, the first dimension index of the DFT beam selected by resource A is adjacent to the first dimension index of the DFT beam selected by resource B, so the network device can divide resource A and resource B into the same resource group.

[0516] Similarly, when the second dimension indexes of the beams selected by two resources are the same or adjacent, the network device can divide the two resources into the same resource group, where the adjacent second dimension indexes represent that the vertical coordinate positions corresponding to the DFT beams in the spatial domain beam index set are adjacent. It should be noted that when the number of layers (number of streams) L is 1, the resource selects one DFT beam, and when the number of layers (number of streams) L is greater than 1, the resource selects multiple DFT beams. Therefore, in the above grouping method, when any two resources are compared, each resource selects one or more beams, and the beams selected by the two resources are at least two beams. When two resources can be divided into the same resource group, the first dimension indexes of at least two beams corresponding to the two reference signals sent on the two resources are the same or adjacent, or the second dimension indexes of at least two beams corresponding to the two reference signals are the same or adjacent.

[0517] Table 79 shows the resource indication corresponding to each of the four resource groups after the network device divides P=16 analog beams into four groups based on historical information.

[0518] Table 79

[0519] Resource indication corresponding to the group Resource indication within the group <![CDATA[GCRI g0]]> <![CDATA[{CRI k0,CRI k1,CRI k5,CRI k9}]]> <![CDATA[GCRI g1]]> <![CDATA[{CRI k2,CRI k4,CRI k6,CRI k8,CRI k 12 }]]> <![CDATA[GCRI g2]]> <![CDATA[{CRI k3,CRI k7,CRI k 10 }]]> <![CDATA[GCRI g3]]> <![CDATA[{CRI k 11 ,CRI k 13 ,CRI k 14 ,CRI k 15 }]]>

[0520] As shown in Table 79, when grouping based on historical information, the number of resources contained in each resource group is not fixed. Each resource group is configured with a corresponding GCRI, and the resources in the group are associated with the GCRI.

[0521] Exemplarily, the network device divides N resources out of the P resources configured in the CSI-RS resource set into a first resource group. When the terminal device reports the first CSI corresponding to the first resource group, the PMI in the first CSI uses a Type I codebook. Accordingly, the format of the first CSI corresponding to the first resource group corresponds to the Type I codebook. For the format of reporting the first CSI corresponding to the first resource group, reference can be made to Tables 80 to 91 and Tables 92 to 133.

[0522] The first CSI corresponding to the first resource group may correspond to one or more of the following fields: GCRI, CRI, RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, joint subband differential CQI of the first TB, wideband CQI of the second TB, joint wideband CQI of the second TB, subband differential CQI of the second TB, joint subband differential CQI of the second TB, LI, joint LI, combined LI, PMI wideband information field X1, joint PMI wideband information field X1, PMI wideband information field X2, joint PMI wideband information field X2, PMI subband information field X2, joint PMI subband information field X2.

[0523] The CRI is used to indicate the first resource group, which is equivalent to the GCRI, and the remaining CSI fields are consistent with the fields corresponding to the first CSI corresponding to the aforementioned N resources.

[0524] Similarly, the fields in the above first CSI can be divided into two parts: a first part (part 1) and a second part (part 2), where the first part (part 1) can correspond to one or more of the following fields: GCRI, CRI, RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, and joint subband differential CQI of the first TB.

[0525] The second part (part 2) can correspond to one or more of the following fields: wideband CQI of the second TB, joint wideband CQI of the second TB, subband differential CQI of the second TB, joint subband differential CQI of the second TB, LI, joint LI, combined LI, PMI wideband information field X1, joint PMI wideband information field X1, PMI wideband information field X2, joint PMI wideband information field X2, PMI subband information field X2, joint PMI subband information field X2.

[0526] Furthermore, the second part (part 2) reported in broadband form may correspond to one or more of the following fields: broadband CQI of the second TB, joint broadband CQI of the second TB, LI, joint LI, combined LI, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, joint PMI broadband information field X2.

[0527] The second part (part 2) reported in subband form may correspond to one or more of the following fields: subband differential CQI of the second TB, joint subband differential CQI of the second TB, PMI subband information field X2, and joint PMI subband information field X2.

[0528] The format of the first part (part 1) of the first CSI corresponding to the first resource group can be referred to as shown in Tables 80 to 91 below. The first part (part 1) can correspond to one or more of the following fields: GCRI, CRI, RI, joint RI, combined RI, wideband CQI of the first TB, joint wideband CQI of the first TB, subband differential CQI of the first TB, and joint subband differential CQI of the first TB. When the first part (part 1) corresponds to GCRI or CRI, it means that the resources in the first resource group are indicated by either GCRI or CRI.

[0529] Table 80

[0530]

[0531] As shown in Table 80, the first part (part 1) may correspond to GCRI or CRI, RI, the wideband CQI of the first TB and the subband differential CQI of the first TB, and each CSI parameter in Table 80 is reported independently.

[0532] Table 81

[0533]

[0534]

[0535] As shown in Table 81, the first part (part 1) can correspond to GCRI or CRI, RI, the wideband CQI of the first TB and the joint subband differential CQI of the first TB, that is, the joint subband differential CQI of the first TB is the joint CSI parameter, and the subband differential CQI in the first TB corresponding to each CSI-RS resource in the first resource group is the joint subband differential CQI in the first TB in Table 81.

[0536] Table 82

[0537]

[0538] As shown in Table 82, the first part (part 1) can correspond to GCRI or CRI, RI, the joint wideband CQI of the first TB and the subband differential CQI of the first TB, that is, the joint wideband CQI of the first TB is the joint CSI parameter, and the wideband CQI in the first TB corresponding to each CSI-RS resource in the first resource group is the joint wideband CQI in the first TB in Table 82.

[0539] Table 83

[0540]

[0541] As shown in Table 83, the first part (part 1) can correspond to GCRI or CRI, RI, joint wideband CQI of the first TB, and joint subband differential CQI of the first TB. The joint wideband CQI of the first TB and the joint subband differential CQI of the first TB are consistent with the previous table and are joint CSI parameters.

[0542] Table 84

[0543]

[0544]

[0545] As shown in Table 84, the first part (part 1) can correspond to the GCRI or CRI, the combined RI, the wideband CQI of the first TB, and the subband differential CQI of the first TB. The combined RI can be associated with the first resource group with reference to the format in Table 84. In some implementations, the combined RI format can also be: N RIs are associated with the first resource group, where the first through Nth RIs are associated with the first through Nth resources in the first resource group (if reported).

[0546] The combined RI includes N RIs. The first RI to the Nth RI are associated with the first resource to the Nth resource in the first resource group. That is, the first RI is associated with the first resource in the first resource group, the second RI is associated with the second resource in the first resource group, and so on. The Nth RI is associated with the Nth resource in the first resource group.

[0547] Table 85

[0548]

[0549] As shown in Table 85, the first part (part 1) can correspond to GCRI or CRI, combined RI, wideband CQI of the first TB, and joint subband differential CQI of the first TB. The combined RI is consistent with Table 84 and contains N RIs corresponding one-to-one to the N resources in the first resource group. The joint subband differential CQI of the first TB is consistent with the previous table and is a joint CSI parameter.

[0550] It should be understood that the format of the combined RI in Table 85 can also be expressed as: N RIs are associated with the above-mentioned first resource group, where the first RI to the Nth RI are associated with the first resource to the Nth resource in the above-mentioned first resource group (if reported).

[0551] Table 86

[0552]

[0553] As shown in Table 86, the first part (part 1) can correspond to GCRI or CRI, combined RI, joint wideband CQI for the first TB, and subband differential CQI for the first TB. The combined RI is consistent with Table 84 and contains N RIs corresponding one-to-one to the N resources in the first resource group. The joint wideband CQI for the first TB is consistent with the previous table and is a joint CSI parameter.

[0554] It should be understood that the format of the combined RI in Table 86 can also be expressed as: N RIs are associated with the above-mentioned first resource group, where the first RI to the Nth RI are associated with the first resource to the Nth resource in the above-mentioned first resource group (if reported).

[0555] Table 87

[0556]

[0557]

[0558] As shown in Table 87, the first part (part 1) can correspond to GCRI or CRI, combined RI, joint wideband CQI for the first TB, and joint subband differential CQI for the first TB. The combined RI is consistent with Table 84 and contains N RIs corresponding one-to-one to the N resources in the first resource group. The joint wideband CQI for the first TB and the joint subband differential CQI for the first TB are consistent with the previous table and are joint CSI parameters.

[0559] It should be understood that the format of the combined RI in Table 87 can also be expressed as: N RIs are associated with the above-mentioned first resource group, where the first RI to the Nth RI are associated with the first resource to the Nth resource in the above-mentioned first resource group (if reported).

[0560] Table 88

[0561]

[0562] As shown in Table 88, the first part (part 1) can correspond to GCRI or CRI, joint RI, wideband CQI of the first TB and subband differential CQI of the first TB, where the joint RI in Table 88 is a joint CSI parameter, and the joint RI is the first RI calculated according to the aforementioned joint calculation method. The joint RI is associated with the first resource group, and the RI corresponding to each CSI-RS resource in the first resource group is the joint RI shown in Table 88.

[0563] Table 89

[0564]

[0565] As shown in Table 89, the first part (part 1) can correspond to GCRI or CRI, joint RI, wideband CQI of the first TB, and joint subband differential CQI of the first TB. Joint RI is consistent with Table 88, and joint subband differential CQI of the first TB is consistent with the previous table, which is a joint CSI parameter.

[0566] Table 90

[0567]

[0568] As shown in Table 90, the first part (part 1) can correspond to GCRI or CRI, joint RI, joint wideband CQI of the first TB, and subband differential CQI of the first TB. The joint RI is consistent with Table 88, and the joint wideband CQI of the first TB is consistent with the previous table, which is a joint CSI parameter.

[0569] Table 91

[0570]

[0571] As shown in Table 91, the first part (part 1) can correspond to GCRI or CRI, joint RI, joint wideband CQI of the first TB, and joint subband differential CQI of the first TB. Joint RI is consistent with Table 88, and joint wideband CQI of the first TB and joint subband differential CQI of the first TB are consistent with the aforementioned table and are joint CSI parameters.

[0572] It should be understood that the above Tables 80 to 91 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 80 to 91 fall within the scope of protection of the embodiments of the present application.

[0573] It should be noted that the format of the first part (part 1) shown in Table 80 to Table 91 above corresponds to the type I codebook.

[0574] The format of the second part (part 2) of the broadband form report corresponding to the first resource group can be referred to as shown in the following Tables 92 to 127. The second part (part 2) of the broadband form can correspond to one or more of the following fields: broadband CQI of the second TB, joint broadband CQI of the second TB, LI, joint LI, combined LI, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, and joint PMI broadband information field X2. Among them, PMI broadband information field X1, joint PMI broadband information field X1, PMI broadband information field X2, and joint PMI broadband information field X2 correspond to broadband PMI.

[0575] In some implementations, the second part (part 2) of the wideband format may include the wideband CQI of the second TB or the joint wideband CQI of the second TB only when the RI, combined RI, or joint RI corresponding to the first resource group in the first part (part 1) of Tables 80 to 91 is greater than 4. Tables 92 to 115 include the wideband CQI of the second TB or the joint wideband CQI of the second TB.

[0576] Table 92

[0577]

[0578] As shown in Table 92, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB, and each CSI parameter in the above Table 92 is reported independently.

[0579] Table 93

[0580]

[0581] As shown in Table 93, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB, that is, the joint PMI broadband information field X2 is a joint CSI parameter, and the joint PMI broadband information field X2 is the common broadband information field X2 calculated according to the aforementioned joint calculation method. The PMI broadband information field X2 corresponding to each CSI-RS resource in the first resource group is the joint PMI broadband information field X2 shown in Table 93.

[0582] The joint PMI wideband information field X2 is a joint indication i2 in a wideband format in the PMI index, and thus one joint PMI wideband information field X2 shown in Table 93 is equivalent to the first PMI.

[0583] Table 94

[0584]

[0585] As shown in Table 94, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB, that is, the joint PMI broadband information field X1 is the joint CSI parameter, the joint PMI broadband information field X1 is the common broadband information field X1 calculated according to the aforementioned joint calculation method, and the PMI broadband information field X1 corresponding to each CSI-RS resource in the first resource group is the joint PMI broadband information field X1 shown in Table 94.

[0586] The joint PMI wideband information field X1 is a joint indication i1 of a wideband form in the PMI index, and thus one joint PMI wideband information field X1 shown in Table 94 is equivalent to the first PMI.

[0587] Table 95

[0588]

[0589]

[0590] As shown in Table 95, the second part (part 2) of the wideband format may correspond to the wideband CQI, LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint PMI wideband information field X1 and the joint PMI wideband information field X2 are consistent with the aforementioned table and are joint CSI parameters.

[0591] Considering the composition of the PMI index, the joint PMI broadband information field X1 and the joint PMI broadband information field X2 in Table 95 can be combined to be regarded as one PMI, which is the first PMI.

[0592] Table 96

[0593]

[0594] As shown in Table 96, the second part (part 2) of the broadband form may correspond to the broadband CQI, combined LI, PMI broadband information field X1, and PMI broadband information field X2 of the second TB. The combined LI includes N LIs, and the first LI to the Nth LI are associated with the first resource to the Nth resource in the first resource group, that is, the first LI is associated with the first resource in the first resource group, the second LI is associated with the second resource in the first resource group, and so on. The Nth LI is associated with the Nth resource in the first resource group.

[0595] In some implementations, the format of the combined LI in Table 96 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0596] Table 97

[0597]

[0598]

[0599] As shown in Table 97, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 96 and contains N LIs corresponding one-to-one to the N resources in the first resource group. The joint PMI wideband information field X2 is consistent with the previous table and is a joint CSI parameter, equivalent to the first PMI.

[0600] It should be understood that the format of the combined LI in Table 97 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0601] Table 98

[0602]

[0603] As shown in Table 98, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, joint PMI wideband information field X1, and PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 96 and contains N LIs corresponding one-to-one to the N resources in the first resource group. The joint PMI wideband information field X1 is consistent with the previous table and is a joint CSI parameter, equivalent to the first PMI.

[0604] It should be understood that the format of the combined LI in Table 98 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0605] Table 99

[0606]

[0607] As shown in Table 99, the second part (part 2) of the wideband format can correspond to the wideband CQI, combined LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The combined LI is consistent with Table 96 and contains N LIs corresponding one-to-one to the N resources in the first resource group. The joint PMI wideband information field X1 and joint PMI wideband information field X2 are consistent with the previous table and are joint CSI parameters, equivalent to the first PMI.

[0608] It should be understood that the format of the combined LI in Table 99 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0609] Table 100

[0610]

[0611]

[0612] As shown in Table 100, the second part (part 2) can correspond to the wideband CQI, joint LI, PMI wideband information field X1 and PMI wideband information field X2 of the second TB, where the joint LI in Table 100 is a joint CSI parameter, the joint LI is associated with the first resource group, and the LI corresponding to each CSI-RS resource in the first resource group is the joint LI shown in Table 100.

[0613] Table 101

[0614]

[0615] As shown in Table 101, the second part (part 2) of the wideband format may correspond to the wideband CQI, joint LI, PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 100, and the joint PMI wideband information field X2 is consistent with the aforementioned table and is a joint CSI parameter, equivalent to the first PMI.

[0616] Table 102

[0617]

[0618]

[0619] As shown in Table 102, the second part (part 2) of the wideband format may correspond to the wideband CQI, joint LI, joint PMI wideband information field X1, and PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 100, and the joint PMI wideband information field X1 is consistent with the aforementioned table and is a joint CSI parameter, equivalent to the first PMI.

[0620] Table 103

[0621]

[0622] As shown in Table 103, the second part (part 2) of the wideband format corresponds to the wideband CQI, joint LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB. The joint LI is consistent with Table 100, and the joint PMI wideband information field X1 and joint PMI wideband information field X2 are consistent with the aforementioned table and are joint CSI parameters. The combined joint PMI wideband information field X1 and joint PMI wideband information field X2 in Table 103 can be considered as a single PMI, which is the first PMI.

[0623] Table 104

[0624]

[0625] As shown in Table 104, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 92.

[0626] Table 105

[0627]

[0628]

[0629] As shown in Table 105, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 93.

[0630] Table 106

[0631]

[0632] As shown in Table 106, the second part (part 2) of the broadband form can correspond to the broadband CQI, LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 94.

[0633] Table 107

[0634]

[0635] As shown in Table 107, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 95.

[0636] Table 108

[0637]

[0638] As shown in Table 108, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 96.

[0639] It should be understood that the format of the combined LI in Table 108 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0640] Table 109

[0641]

[0642] As shown in Table 109, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 97.

[0643] It should be understood that the format of the combined LI in Table 109 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0644] Table 110

[0645]

[0646] As shown in Table 110, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 98.

[0647] It should be understood that the format of the combined LI in Table 110 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0648] Table 111

[0649]

[0650] As shown in Table 111, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, combined LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 99.

[0651] It should be understood that the format of the combined LI in Table 111 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0652] Table 112

[0653]

[0654]

[0655] As shown in Table 112, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 100.

[0656] Table 113

[0657]

[0658] As shown in Table 113, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 101.

[0659] Table 114

[0660]

[0661] As shown in Table 114, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, joint PMI broadband information field X1 and PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 102.

[0662] Table 115

[0663]

[0664] As shown in Table 115, the second part (part 2) of the broadband form can correspond to the joint broadband CQI, joint LI, joint PMI broadband information field X1 and joint PMI broadband information field X2 of the second TB. The remaining fields except the joint broadband CQI of the second TB are consistent with Table 103.

[0665] In some implementations, when the value of the RI, combined RI, or joint RI corresponding to the first resource group in the first part (part 1) of Tables 80 to 91 is less than or equal to 4, the second part (part 2) of the wideband format does not include the CQI in the second TB. The formats of the second part (part 2) of the wideband format corresponding to the first resource group shown in Tables 116 to 127 do not include the CQI in the second TB.

[0666] Table 116

[0667]

[0668]

[0669] As shown in Table 116, the second part (part 2) of the broadband form can correspond to LI, PMI broadband information field X1 and PMI broadband information field X2. Table 116 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 92 and Table 104.

[0670] Table 117

[0671]

[0672] As shown in Table 117, the second part (part 2) of the broadband form can correspond to LI, PMI broadband information field X1 and joint PMI broadband information field X2. Table 117 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 93 and Table 105.

[0673] Table 118

[0674]

[0675] As shown in Table 118, the second part (part 2) of the broadband form can correspond to LI, the joint PMI broadband information field X1 and the PMI broadband information field X2. Table 118 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 94 and Table 106.

[0676] Table 119

[0677]

[0678]

[0679] As shown in Table 119, the second part (part 2) of the broadband form can correspond to LI, joint PMI broadband information field X1 and joint PMI broadband information field X2. Table 119 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 95 and Table 107.

[0680] Table 120

[0681]

[0682] As shown in Table 120, the second part (part 2) of the broadband form can correspond to the combined LI, PMI broadband information field X1 and PMI broadband information field X2. Table 120 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 96 and Table 108.

[0683] It should be understood that the format of the combined LI in Table 120 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0684] Table 121

[0685]

[0686] As shown in Table 121, the second part (part 2) of the broadband form can correspond to the combined LI, PMI broadband information field X1 and joint PMI broadband information field X2. Table 121 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 97 and Table 109.

[0687] It should be understood that the format of the combined LI in Table 120 may also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0688] Table 122

[0689]

[0690]

[0691] As shown in Table 122, the second part (part 2) of the broadband form can correspond to the combined LI, the joint PMI broadband information field X1 and the PMI broadband information field X2. Table 122 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 98 and Table 110.

[0692] It should be understood that the format of the combined LI in Table 122 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0693] Table 123

[0694]

[0695] As shown in Table 123, the second part (part 2) of the broadband form can correspond to the combined LI, joint PMI broadband information field X1 and joint PMI broadband information field X2. Table 123 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 99 and Table 111.

[0696] It should be understood that the format of the combined LI in Table 123 can also be expressed as: the combined LI is associated with the above-mentioned first resource group (if reported).

[0697] Table 124

[0698]

[0699] As shown in Table 124, the second part (part 2) of the broadband form can correspond to the joint LI, PMI broadband information field X1 and PMI broadband information field X2. Table 124 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 100 and Table 112.

[0700] Table 125

[0701]

[0702] As shown in Table 125, the second part (part 2) of the broadband form can correspond to the joint LI, PMI broadband information field X1 and the joint PMI broadband information field X2. Table 125 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 101 and Table 113.

[0703] Table 126

[0704]

[0705]

[0706] As shown in Table 126, the second part (part 2) of the broadband form can correspond to the joint LI, the joint PMI broadband information field X1 and the PMI broadband information field X2. Table 126 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 102 and Table 114.

[0707] Table 127

[0708]

[0709] As shown in Table 127, the second part (part 2) of the broadband form can correspond to the joint LI, the joint PMI broadband information field X1 and the joint PMI broadband information field X2. Table 127 does not include the broadband CQI in the second TB or the joint broadband CQI in the second TB. The remaining fields are consistent with Table 103 and Table 115.

[0710] It should be understood that the above Tables 92 to 127 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 92 to 127 fall within the scope of protection of the embodiments of the present application.

[0711] It should be noted that the format of the second part (part 2) of the broadband form corresponding to the first resource group shown in Table 92 to Table 127 above corresponds to the type I codebook.

[0712] The format of the second part (part 2) reported in subband format can be referenced as shown in Tables 128 to 133 below. The second part (part 2) in subband format can correspond to one or more of the following fields: subband differential CQI of the second TB, joint subband differential CQI of the second TB, PMI subband information field X2, and joint PMI subband information field X2. Among them, PMI subband information field X2 and joint PMI subband information field X2 correspond to subband PMI.

[0713] In some implementations, the second part (part 2) of the subband format may include the subband differential CQI of the second TB or the joint subband differential CQI of the second TB only when the RI, combined RI, or joint RI corresponding to the first resource group in the first part (part 1) of Tables 80 to 91 is greater than 4. Tables 128 to 133 include the subband differential CQI of the second TB or the joint subband differential CQI of the second TB.

[0714] Table 128

[0715]

[0716]

[0717] As shown in Table 128, the second part (part 2) in subband form may correspond to the subband differential CQI and PMI subband information field X2 of the second TB, and each CSI parameter in Table 128 may be reported independently.

[0718] The subband differential CQIs of the second TB in Table 128 can be divided into odd subbands and even subbands. The subband differential CQIs of the second TB corresponding to the N even subbands correspond one-to-one with the N CSI-RS resources in the first resource group, and the subband differential CQIs of the second TB corresponding to the N odd subbands correspond one-to-one with the N CSI-RS resources in the first resource group. The PMI subband information field X2 in Table 128 can also be divided into odd subbands and even subbands. The PMI subband information field X2 corresponding to the N even subbands corresponds one-to-one with the N CSI-RS resources in the first resource group, and the PMI subband information field X2 corresponding to the N odd subbands corresponds one-to-one with the N CSI-RS resources in the first resource group.

[0719] Table 129

[0720]

[0721] As shown in Table 129, the second part (part 2) in subband form may correspond to the subband differential CQI and joint PMI subband information field X2 of the second TB, where the joint PMI subband information field X2 is a joint CSI parameter, and the PMI subband information field X2 corresponding to each CSI-RS resource in the first resource group is the joint PMI subband information field X2 shown in Table 129.

[0722] The joint PMI subband information field X2 is a joint indication i2 in subband form in the PMI index, so a joint PMI subband information field X2 consisting of an odd subband and an even subband shown in Table 129 is equivalent to the first PMI.

[0723] Table 130

[0724]

[0725] As shown in Table 130, the second part (part 2) in subband form can correspond to the joint subband differential CQI and PMI subband information field X2 of the second TB, where the joint subband differential CQI of the second TB is a joint CSI parameter, and the subband differential CQI of the second TB corresponding to each CSI-RS resource in the first resource group is the joint subband differential CQI of the second TB shown in Table 130.

[0726] Table 131

[0727]

[0728] As shown in Table 131, the second part (part 2) of the subband format may correspond to the joint subband differential CQI and joint PMI subband information field X2 of the second TB. The joint subband differential CQI and joint PMI subband information field X2 of the second TB is consistent with the aforementioned table and is a joint CSI parameter.

[0729] In some implementations, when the value of the RI, combined RI, or joint RI corresponding to the first resource group in the first part (part 1) of Tables 80 to 91 is less than or equal to 4, the second part (part 2) of the subband format does not include the CQI in the second TB. The formats of the second part (part 2) of the subband format corresponding to the first resource group shown in Tables 132 to 133 do not include the CQI in the second TB.

[0730] Table 132

[0731]

[0732] As shown in Table 132, the second part (part 2) in subband form can correspond to the PMI subband information field X2. Table 132 does not include the subband differential CQI in the second TB or the joint subband differential CQI in the second TB. The remaining fields are consistent with Table 128 and Table 130.

[0733] Table 133

[0734]

[0735] As shown in Table 133, the second part (part 2) in subband form can correspond to the joint PMI subband information field X2. Table 133 does not include the subband differential CQI in the second TB or the joint subband differential CQI in the second TB. The remaining fields are consistent with Table 129 and Table 131.

[0736] It should be understood that the above Tables 128 to 133 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 128 to 133 fall within the scope of protection of the embodiments of the present application.

[0737] It should be noted that the format of the second part (part 2) of the subband form corresponding to the first resource group shown in Tables 128 to 133 above corresponds to the type I codebook.

[0738] When the terminal device reports the first CSI corresponding to the first resource group, the first part (part 1) shown in Tables 80 to 91 above and the second part (part 2) shown in Tables 92 to 133 can be freely combined.

[0739] According to the above table, when a CSI parameter in the first CSI corresponds one-to-one to N CSI-RS resources or resources in the first resource group, for the same CSI parameter, the order of the CSI fields in the first CSI is arranged according to the CRI numbering order corresponding to each CSI-RS resource. For example, in the first part (part1) of the first CSI corresponding to N resources shown in Table 9, when N CRIs are reported, the corresponding CSI field order from front to back is CRI k0, CRI k1, CRI k2, ..., CRIk N-1 .

[0740] In some implementations, the CSI field order can also be sorted based on the RSRP corresponding to each CSI-RS resource. As an example, the N RSRPs corresponding to N CSI-RS resources are sorted in descending order, and the CSI fields in the first CSI are sorted according to the order of the CSI-RS resources corresponding to the descending RSRP order. For example, if N is 4, RSRP#0 corresponds to CRI k0, RSRP#1 corresponds to CRI k1, RSRP#2 corresponds to CRI k2, and RSRP#3 corresponds to CRI k3. Arranging the RSRP values in descending order, the order of RSRP from highest to lowest is: RSRP#2, RSRP#1, RSRP#0, RSRP#3. Accordingly, when reporting four CRIs, the corresponding CSI fields are ordered from front to back as CRI k2, CRI k1, CRI k0, CRI k3. Similarly, when reporting other CSI parameters, the CSI fields of the same CSI parameter in the first CSI can be sorted according to this implementation.

[0741] In some implementations, if various parameters in the first CSI are reported jointly or independently, the jointly reported CSI parameters may be arranged first and the independently reported CSI parameters may be arranged last.

[0742] As can be seen from the above embodiments, whether the terminal device determines N resources from the P resources configured in the CSI-RS resource set, or the network device divides the N resources from the P resources configured in the CSI-RS resource set into a first resource group, the CRIs in the corresponding first CSI are concentrated and arranged in the first part (part 1). In some implementations, some low-priority CRIs may also be arranged in the second part (part 2).

[0743] As an example, when the terminal device determines N resources from P resources configured in the CSI-RS resource set, the first CSI includes CRI k0 to CRI k N-1 There are N CRIs in total. Based on the different resource priorities among the N CSI-RS resources, the CRIs corresponding to high-priority resources can be arranged in the first part (part 1), and the CRIs corresponding to the remaining low-priority resources can be arranged in the second part (part 2). The format for reporting the first CSI can be referred to Tables 134 to 136.

[0744] Table 134

[0745]

[0746]

[0747] As shown in Table 134, the first CSI includes a first part (part 1), a second part in wideband form (part 2) and a second part in subband form (part 2). The first CSI corresponding to N resources can correspond to N CRIs, RI (RI>4), the wideband CQI of the first TB, the subband differential CQI of the first TB, the wideband CQI of the second TB, the subband differential CQI of the second TB, LI, PMI wideband information field X1, PMI wideband information field X2 and PMI subband information field X2. Each CSI parameter is reported independently.

[0748] in, Corresponding to the high-priority resources among N resources, Corresponding to the low-priority resources among N resources, means round down. Therefore, Arranged in part 1, CRI Arranged in the second part (part 2) of the broadband form.

[0749] Accordingly, the first RI~ The RIs are arranged in the first part (part 1), The RI to the Nth RI are arranged in the second part (part 2) of the broadband format.

[0750] The first broadband CQI in the first TB~ The wideband CQI in the first TB is arranged in the first part (part 1), The wideband CQI in the first TB to the wideband CQI in the Nth first TB are arranged in the second part (part 2).

[0751] The first subband differential CQI in the first TB~the The subband differential CQI in the first TB is arranged in the first part (part 1), The subband differential CQI in the first TB to the subband differential CQI in the Nth first TB are arranged in the second part (part 2) of the wideband format. The arrangement order of the remaining contents in the CSI field can refer to the above content and is unchanged in Table 134.

[0752] Table 135

[0753]

[0754]

[0755] As shown in Table 135, the first CSI includes a first part (part 1), a second part in wideband form (part 2), and a second part in subband form (part 2). The first CSI corresponding to N resources can correspond to N CRIs, joint RI (joint RI>4), the wideband CQI of the first TB, the subband differential CQI of the first TB, the wideband CQI of the second TB, the subband differential CQI of the second TB, LI, joint PMI wideband information field X1, joint PMI wideband information field X2, and joint PMI subband information field X2. The joint RI, joint PMI wideband information field X1, joint PMI wideband information field X2, and joint PMI subband information field X2 in Table 135 are joint CSI parameters, and the above joint CSI parameters are jointly reported.

[0756] in, Corresponding to the high-priority resources among N resources, Corresponding to the low-priority resources among N resources, means round down. Therefore, Arranged in part 1, CRI Arranged in the second part (part 2) of the broadband form.

[0757] Since the joint RI is a common RI associated with N CSI-RS resources and corresponds to a single RI value, the joint RI is retained in the first part (part 1). The joint PMI wideband information field X1 and the joint PMI wideband information field X2 are arranged in the second part (part 2) in wideband format, and the joint PMI subband information field X2 is arranged in the second part (part 2) in subband format. The arrangement order remains unchanged.

[0758] The arrangement order of the remaining CSI parameters in the first CSI is consistent with Table 134 and does not change in Table 135.

[0759] Table 136

[0760]

[0761]

[0762] As shown in Table 136, the first CSI includes a first part (part 1), a second part in broadband form (part 2) and a second part in subband form (part 2). The first CSI corresponding to N resources can correspond to N CRIs, joint RI (joint RI>4), the joint broadband CQI of the first TB, the joint subband differential CQI of the first TB, the joint broadband CQI of the second TB, the joint subband differential CQI of the second TB, the joint LI, the joint PMI broadband information field X1, the joint PMI broadband information field X2 and the joint PMI subband information field X2, that is, all CSI parameters in Table 136 are jointly reported.

[0763] in, Corresponding to the high-priority resources among N resources, Corresponding to the low-priority resources among N resources, means round down. Therefore, Arranged in part 1, CRI Arranged in the second part (part 2) of the broadband form.

[0764] The joint RI, the joint wideband CQI of the first TB, and the joint subband differential CQI of the first TB are retained in the first part (part 1). The joint wideband CQI, joint LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB are arranged in the second part (part 2) in wideband form, and the joint subband differential CQI and joint PMI subband information field X2 of the second TB are arranged in the second part (part 2) in subband form. The arrangement order remains unchanged.

[0765] It should be understood that the above Tables 134 to 136 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 134 to 136 fall within the scope of protection of the embodiments of the present application.

[0766] As another example, when the network device divides N resources out of P resources configured in the CSI-RS resource set into a first resource group, the first CSI includes a GCRI for indicating the first resource group, and the N CSI-RS resources included in the first resource group can be divided into two parts, for example: according to the CRI k corresponding to each resource in the N CSI-RS resources in the first resource group, n The parity property of the subscript n divides the resource into two parts, or, according to the CRI k corresponding to each resource in the N CSI-RS resources nAlternatively, the RSRPs corresponding to the N CSI-RS resources are arranged in descending order, and the resources are divided into two parts according to the order of the CSI-RS resources corresponding to the RSRPs arranged in descending order.

[0767] Accordingly, the resource indication corresponding to the first part of the resources is GCRI g1 is associated with the first part of the resource, and the resource indicator corresponding to the second part of the resource is GCRI g1 is associated with the second part of resources. The format for reporting the first CSI can refer to Tables 137 to 139.

[0768] Table 137

[0769]

[0770]

[0771] As shown in Table 137, the first CSI includes a first part (part 1), a second part in broadband form (part 2) and a second part in subband form (part 2). The first CSI corresponding to the first resource group can correspond to GCRI, RI (RI>4), broadband CQI of the first TB, subband differential CQI of the first TB, broadband CQI of the second TB, subband differential CQI of the second TB, LI, PMI broadband information field X1, PMI broadband information field X2 and PMI subband information field X2. Each CSI parameter is reported independently.

[0772] The GCRI g0 may be arranged in the first part (part 1) of the first CSI and associated with the first part of resources, and the GCRI g1 may be arranged in the second part (part 2) of the first CSI and associated with the second part of resources.

[0773] Accordingly, the first RI~ The RIs are arranged in the first part (part 1), The RI to the Nth RI are arranged in the second part (part 2) of the broadband format.

[0774] The first broadband CQI in the first TB~ The wideband CQI in the first TB is arranged in the first part (part 1), The wideband CQI in the first TB to the wideband CQI in the Nth first TB are arranged in the second part (part 2).

[0775] The first subband differential CQI in the first TB~the The subband differential CQI in the first TB is arranged in the first part (part 1), The subband differential CQI in the first TB to the subband differential CQI in the Nth first TB are arranged in the second part (part 2) of the wideband format. The arrangement order of the remaining contents in the CSI field can refer to the above content and is unchanged in Table 137.

[0776] Table 138

[0777]

[0778]

[0779] As shown in Table 138, the first CSI includes a first part (part 1), a second part in wideband form (part 2), and a second part in subband form (part 2). The first CSI corresponding to N resources can correspond to GCRI, joint RI (joint RI>4), wideband CQI of the first TB, subband differential CQI of the first TB, wideband CQI of the second TB, subband differential CQI of the second TB, LI, joint PMI wideband information field X1, joint PMI wideband information field X2, and joint PMI subband information field X2. The joint RI, joint PMI wideband information field X1, joint PMI wideband information field X2, and joint PMI subband information field X2 in Table 138 are joint CSI parameters, and the above joint CSI parameters are jointly reported.

[0780] The GCRI g0 may be arranged in the first part (part 1) of the first CSI and associated with the first part of resources, and the GCRI g1 may be arranged in the second part (part 2) of the first CSI and associated with the second part of resources.

[0781] Since the joint RI is a common RI associated with N CSI-RS resources and corresponds to a single RI value, the joint RI is retained in the first part (part 1). The joint PMI wideband information field X1 and the joint PMI wideband information field X2 are arranged in the second part (part 2) in wideband format, and the joint PMI subband information field X2 is arranged in the second part (part 2) in subband format. The arrangement order remains unchanged.

[0782] The arrangement order of the remaining CSI parameters in the first CSI is consistent with Table 137 and does not change in Table 138.

[0783] Table 139

[0784]

[0785] As shown in Table 139, the first CSI includes a first part (part 1), a second part in broadband form (part 2) and a second part in subband form (part 2). The first CSI corresponding to the first resource group can correspond to GCRI, joint RI (joint RI>4), joint broadband CQI of the first TB, joint subband differential CQI of the first TB, joint broadband CQI of the second TB, joint subband differential CQI of the second TB, joint LI, joint PMI broadband information field X1, joint PMI broadband information field X2 and joint PMI subband information field X2, that is, all CSI parameters in Table 139 are jointly reported.

[0786] Among them, GCRI g0 can be arranged in the first part (part 1) of the first CSI and associated with the first part of resources, and GCRI g1 can be arranged in the second part (part 2) of the first CSI and associated with the second part of resources.

[0787] The joint RI, the joint wideband CQI of the first TB, and the joint subband differential CQI of the first TB are retained in the first part (part 1). The joint wideband CQI, joint LI, joint PMI wideband information field X1, and joint PMI wideband information field X2 of the second TB are arranged in the second part (part 2) in wideband form, and the joint subband differential CQI and joint PMI subband information field X2 of the second TB are arranged in the second part (part 2) in subband form. The arrangement order remains unchanged.

[0788] It should be understood that the above Tables 137 to 139 are merely illustrative and should not limit the embodiments of the present application. New table contents obtained by reasonable modification or supplementation of the contents of Tables 137 to 139 fall within the scope of protection of the embodiments of the present application.

[0789] It should be noted that if the N CRIs are indicated in the form of a bitmap, the CRI sorting method in the above implementation is no longer applicable.

[0790] By sorting the CSI fields in the first CSI, when reporting resources are tight or reporting conflicts occur, the CSI parameters corresponding to resources with higher resource priorities can be reported first, thereby avoiding the loss of important feedback information as much as possible and ensuring feedback quality.

[0791] It should be noted that when the network device divides N resources out of the P resources configured in the CSI-RS resource set into a first resource group, the network device needs to indicate the first resource group to the terminal device.

[0792] In some implementations, such as Figure 7As shown in S600-2 in the figure, the network device sends the second indication information to the terminal device. Accordingly, the terminal device receives the second indication information from the network device. The second indication information is used to indicate the first resource group, that is, the second indication information indicates that N resources out of the P resources configured in the CSI-RS resource set belong to the first resource group. The terminal device can determine the first CSI corresponding to the first resource group and report it based on the second indication information. It can be understood that when the network device is divided into other resource groups such as the second resource group and the third resource group, the second indication information is also used to indicate each other resource group.

[0793] In some implementations, the network device may also indicate the grouping method selected by the network device through a field in the RRC signaling. As an example, when Group_type = 0, it indicates that the network device groups multiple simulated beams uniformly and adjacently, and indicates that the number of resources in each resource group is N. Accordingly, the terminal device may set CRI k n N resources with consecutive subscript n are determined as the same resource group. For example, the terminal device numbers CRI as CRI k0, CRI k1, ..., CRI k N-1 The corresponding resources are determined to be the same resource group; when Group_type=1, it means that the network device groups multiple simulated beams into even intervals and indicates the value of the interval T. Accordingly, the terminal device can n N resources with a subscript n difference of (T+1) are determined to be the same resource group. For example, the terminal device numbers CRI as CRI k0, CRI k T+1 , CRI k 2×(T+1) ,…,CRIk (N-1)×(T+1) The corresponding resources are determined to be the same resource group; when Group_type=2, the network device directly indicates the corresponding multiple resource groups based on historical information. It should be understood that the "Group_type" field here indicates one representation method and may also be other methods, which is not a limitation of this application.

[0794] According to the above embodiments, the various CSI parameters in the first CSI fed back by the terminal device can be reported jointly or independently. Therefore, the terminal device needs to confirm the specific CSI parameters for joint reporting before feeding back the first CSI.

[0795] In some implementations, such as Figure 7As shown in S600-3 in the figure, the network device sends the first indication information to the terminal device. Accordingly, the terminal device receives the first indication information from the network device. The first indication information is used to indicate whether the first CSI contains specified CSI parameters that need to be jointly reported. As an example, the first indication information may indicate that the first RI and / or the first PMI are to be reported, that is, the RI and / or PMI are jointly reported in the first CSI fed back by the terminal device. When the first indication information indicates that the first PMI is to be reported, the first indication information may also indicate that the first PMI is a broadband PMI and / or a subband PMI.

[0796] In some implementations, the network device may also indicate jointly reported CSI parameters through a field in RRC signaling. For example, when report_mode = 0, all CSI parameters in the first CSI are reported independently; when report_mode = 1, the GCRI corresponding to the resource group is reported jointly; when report_mode = 2, only the RI is reported jointly; when report_mode = 3, only the wideband PMI is reported jointly; when report_mode = 4, only the subband PMI is reported jointly; when report_mode = 5, the wideband PMI and subband PMI are reported jointly; when report_mode = 6, the RI, wideband PMI, and subband PMI are reported jointly; and when report_mode = 7, the RI, wideband PMI, and subband PMI are reported jointly.

[0797] It should be understood that the "report_mode" field here indicates one representation method, and may also be other methods, which is not a limitation of this application.

[0798] The above method of indicating the joint reporting of CSI parameters through the first indication information or RRC signaling is an explicit method. In some implementation methods, the jointly reported CSI parameters can also be determined implicitly. As an example, the terminal device can directly calculate the first RI according to the joint calculation method, and determine whether the first CSI includes the first RI and / or the first PMI based on the numerical value corresponding to the first RI. For example: when the value of the first RI is 1, the RI, wideband PMI and subband PMI are jointly reported; when the value of the first RI is 2, the RI and wideband PMI are jointly reported; when the value of the first RI is 3, the RI and subband PMI are jointly reported; when the value of the first RI is 4, only the RI is jointly reported; when the value of the first RI is greater than 4, all CSI parameters in the first CSI are reported independently. That is, when the value of the first RI is greater than 4, the first CSI does not include the first RI and the first PMI; when the value of the first RI is 4, the first CSI only includes the first RI; when the first RI is less than 4, the first CSI includes both the first RI and the first PMI.

[0799] It can be understood that the above channel state information feedback method proposed in this application is also applicable to the ABF architecture.

[0800] Figures 8 to 10 Schematic diagram of the structure of a possible channel state information feedback device provided in an embodiment of the present application. These channel state information feedback devices can be used to implement the functions of the terminal device or network device in the above method embodiment, and thus can also achieve the beneficial effects of the above method embodiment. In the embodiment of the present application, the channel state information feedback device can be as follows Figure 6 or Figure 7 The terminal device or network device in the method embodiment shown may also be a component configured in the terminal device or network device (such as a chip, a chip system, a processor, etc.), or may be a logic module or software that can implement part or all of the functions of the terminal device or network device.

[0801] Figure 8 It is a schematic block diagram of a channel state information feedback device 800 provided in one embodiment of the present application.

[0802] like Figure 8 As shown, the channel state information feedback device 800 includes a processing module 810 and a transceiver module 820 .

[0803] The transceiver module 820 can implement corresponding communication functions and can also be referred to as an input / output interface or a communication unit. The processing module 810 can be used to perform processing operations. It should be understood that if the apparatus 800 is a component configured in a network device or terminal device, such as a chip, the transceiver module 820 can be an input / output interface.

[0804] Optionally, the transceiver module 820 may include a sending module and a receiving module. The sending module is used to execute the above Figure 6 or Figure 7 The sending operation of the network device or terminal device in the receiving module is used to perform the above Figure 6 or Figure 7 The receiving operation of the network device or terminal device.

[0805] It should be understood that when the device 800 is a component configured in a network device or terminal device, such as a chip, the sending module can be an output interface, and the sending operation involved in the embodiment of the present application can be performed by the output interface; the receiving module can be an input interface, and the receiving operation involved in the embodiment of the present application can be performed by the input interface.

[0806] Optionally, the device 800 may further include a storage module, which may be used to store instructions and / or data. The processing module 810 may read the instructions and / or data in the storage module to enable the device to implement the aforementioned Figure 6 or Figure 7 The method embodiment shown.

[0807] In one possible design, the apparatus 800 may be used to implement the above Figure 6 or Figure 7 The function of the terminal device in the method embodiment shown, or the above-mentioned device 800 may include a device for implementing the above-mentioned Figure 6 or Figure 7 Any function or operation unit of the terminal device in the method embodiment shown may be implemented in whole or in part by software, hardware, firmware or any combination thereof.

[0808] When the device 800 is used to implement Figure 6 or Figure 7 When the terminal device functions in the method embodiment shown, the transceiver module 820 (specifically, the receiving module) can be used to perform Figure 6 Step S601 in the embodiment of the present invention receives P reference signals from a network device; the processing module 810 can be used to perform Figure 6 In step S602, first channel state information CSI is determined based on N reference signals in the P reference signals, the first CSI includes a first RI and / or a first PMI, the first RI is the RI corresponding to the N reference signals, the first PMI is the PMI corresponding to the N reference signals, the N reference signals correspond one-to-one to the N resources in the resource set, and N is an integer greater than 1; the transceiver module 820 (specifically, the sending module) can also be used to perform Figure 6 In step S603, the first CSI is sent to the network device.

[0809] In another possible design, the above-mentioned device 800 can be used to implement the above-mentioned Figure 6 or Figure 7 The function of the network device in the method embodiment shown, or the above-mentioned device 800 may include a device for implementing the above-mentioned Figure 6 or Figure 7 Any function or operation unit of the network device in the illustrated method embodiment may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.

[0810] When the device 800 is used to implement Figure 6 or Figure 7 When the network device functions in the method embodiment shown, the transceiver module 820 (specifically, the sending module) can be used to perform Figure 6In step S601, P reference signals are sent to the terminal device; the transceiver module 820 (specifically, the receiving module) can be used to perform Figure 6 In step S603, a first CSI is received from a terminal device.

[0811] For more detailed description of the processing module 810 and the transceiver module 820, please refer to Figure 6 or Figure 7 The relevant description in the method embodiment shown is directly obtained and will not be repeated here.

[0812] It should be noted that the transceiver module may also be referred to as a transceiver unit, transceiver, transceiver, or transceiver device. The processing module may also be referred to as a processor, processing board, processing unit, or processing device. Optionally, the transceiver module is used to perform the sending and receiving operations on the terminal device or network device side in the above method. The device in the communication module that implements the receiving function can be considered a receiving module, and the device in the communication module that implements the sending function can be considered a sending module. That is, the transceiver module includes a receiving module and a sending module.

[0813] In addition, in one possible design, the aforementioned transceiver module and / or processing module may be implemented as a virtual module. For example, the processing module may be implemented as a software function module or a virtual device, and the transceiver module may be implemented as a software function module or a virtual device. In another possible design, the processing module or the transceiver module may also be implemented as a physical device. For example, if the device is implemented using a chip / chip circuit, the transceiver module may be an input / output circuit and / or a communication interface that performs input operations (corresponding to the aforementioned receiving operations) and output operations (corresponding to the aforementioned sending operations); the processing module is an integrated processor, microprocessor, or integrated circuit.

[0814] It should be understood that the division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically as separate modules, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0815] Figure 9 This is a schematic diagram of the structure of a channel state information feedback device provided in another embodiment of the present application. The device 900 can be a chip system, or it can also be a device configured with a chip system for implementing the above method embodiment. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0816] like Figure 9As shown, the apparatus 900 may include a processor 902, which may be configured to execute computer programs or instructions in a memory to implement Figure 6 or Figure 7 The method embodiment shown is a step performed by a terminal device or a step performed by a network device.

[0817] Optionally, the apparatus 900 further includes a communication interface 903. The communication interface 903 can be used to communicate with other devices via a transmission medium, so that the apparatus 900 can communicate with other devices. The communication interface 903 can be, for example, a transceiver, an interface, a bus, a circuit, or a device capable of implementing transceiver functions. The processor 902 can use the communication interface 903 to input and output data, and to implement Figure 6 or Figure 7 The channel state information feedback method of the embodiment shown is specifically configured as follows: The apparatus 900 may be used to implement the functions of the network device or terminal device of the above method embodiment.

[0818] When the device 900 is used to implement Figure 6 or Figure 7 When performing the method shown in FIG. 8 , the processor 902 is used to implement the functions of the processing module 810, for example, executing Figure 6 or Figure 7 In step S602, the communication interface 903 is used to implement the functions of the above-mentioned transceiver module 820, for example, to execute Figure 6 or Figure 7 Steps 601 and 603 in the above example may also be performed. Figure 7 Steps S600-1 to S600-3 in .

[0819] Optionally, the device 900 further includes at least one memory 901 for storing program instructions and / or data. The memory 901 is coupled to the processor 902. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, and is used for information exchange between devices, units, or modules. The processor 902 may operate in conjunction with the memory 901. The processor 902 may execute program instructions stored in the memory 901. At least one of the at least one memory may be included in the processor.

[0820] It should be understood that the coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 902 may operate in conjunction with the memory 901. The specific connection medium between the above-mentioned processor 902, communication interface 903 and memory 901 is not limited in the embodiment of the present application. Figure 8The processor 902, the communication interface 903 and the memory 901 are connected via a bus 904. The bus 904 is connected to the processor 902, the communication interface 903 and the memory 901. Figure 8 The connections between the components are shown in bold. The connections between the components are for illustration only and are not intended to be limiting. The bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, Figure 9 The bus is represented by only one line with an arrow, but this does not mean that there is only one bus or one type of bus.

[0821] It should be understood that when the communication device 900 is a chip applied to a terminal device, the chip implements the functions of the terminal device in the above-mentioned method embodiment. The chip of the terminal device receives a signal from other modules in the terminal device (such as a radio frequency module or antenna), and the signal may be sent by the network device to the terminal device; or the chip of the terminal device sends a signal to other modules in the terminal device (such as a radio frequency module or antenna), and the signal may be sent by the terminal device to the network device.

[0822] When the communication device 900 is a chip used in a network device, the chip implements the functions of the network device in the above method embodiments. The chip of the network device receives signals from other modules in the network device (such as a radio frequency module or antenna), and the signals may be sent by a terminal to the network device; or the chip of the network device sends signals to other modules in the network device (such as a radio frequency module or antenna), and the signals may be sent by the network device to the terminal.

[0823] It should be noted that when the communication device 900 is a terminal device or a network device, the communication interface 903 may be a transceiver, specifically including a transmitter and a receiver, where the transmitter is used to send signals and the receiver is used to receive signals. When the communication device 900 is a chip used in a terminal device or a network device, the communication interface 903 may be an input / output circuit, a bus, a module, a pin, or other type of communication interface input / output circuit, where the input circuit of the input / output circuit can be used for receiving and the output interface can be used for sending.

[0824] Figure 10 A schematic structural diagram of a channel state information feedback device provided in yet another embodiment of the present application.

[0825] The channel state information feedback device 1000 may be, for example, a terminal device or a network device. The device 1000 may be used to implement Figure 6 or Figure 7The method in the illustrated embodiment. The device 1000 logically includes multiple parts, such as a processor 1001, a memory 1002, and a signal transceiver unit 1003. Among them, the memory 1002 can be used to store a computer program (also called code, or instruction). The signal transceiver unit 1003 is used to implement communication and signaling interaction, signal amplification, etc. between the network device and the terminal device. The signal transceiver unit 1003 includes a transmitter 10031, a receiver 10032 and an antenna 10033. In the antenna 10033, a box represents a digital channel, F in the box is the digital precoding weight, and a phase shifter (circle with an oblique arrow) represents an analog channel, connecting one array or multiple arrays, that is, in practice, one phase shifter can control multiple arrays, or the phase shifter and the array can be cross-connected.

[0826] An embodiment of the present application further provides a computer-readable storage medium, in which computer instructions are stored. When a processor executes the computer instructions, each step of the method in the above embodiment is implemented.

[0827] An embodiment of the present application further provides a computer program product, including computer instructions, which, when executed by a processor, implement the various steps of the method in the above embodiment.

[0828] An embodiment of the present application also provides a communication system, which includes the aforementioned terminal device and network device.

[0829] It should be noted that the modules or components shown in the above embodiments may be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits, one or more microprocessors, or one or more field programmable gate arrays. For another example, when a module is implemented by a processing element calling program code, the processing element may be a general-purpose processor, such as a central processing unit or other processor capable of calling program code, such as a controller. For another example, these modules may be integrated together and implemented in the form of a system-on-chip (SoC).

[0830] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, software modules or any combination thereof. When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0831] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope of this application is indicated by the following claims.

[0832] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A channel state information feedback method, applied to a terminal device, characterized in that: The method comprises: Determine first channel state information CSI, where the first CSI includes a first rank indicator RI and / or a first precoding matrix indicator PMI, where the first RI is an RI corresponding to N reference signals, and the first PMI is a PMI corresponding to the N reference signals, where the N reference signals correspond one-to-one to N resources in a resource set, and N is an integer greater than 1; The first CSI is sent to a network device.

2. The method according to claim 1, characterized in that The first CSI further includes a first parameter, which includes at least one of the following parameters: a channel state information reference signal resource indicator CRI, a wideband channel quality indicator CQI of the first transport block TB, a subband differential CQI of the first TB, a layer indicator LI, a wideband CQI of the second TB, an even subband differential CQI of the second TB, or an odd subband differential CQI of the second TB; Each parameter in the first parameters includes one or more parameters corresponding to the N reference signals.

3. The method according to claim 1 or 2, characterized in that Before determining the first channel state information CSI, the method further includes: Receive first indication information from the network device, where the first indication information is used to indicate whether the first CSI includes the first RI and / or the first PMI.

4. The method according to any one of claims 1 to 3, characterized in that The determining of first channel state information CSI includes: Determine whether the first CSI includes the first RI and / or the first PMI according to the value corresponding to the first RI.

5. The method according to any one of claims 1 to 4, characterized in that The first PMI is a wideband PMI and / or a subband PMI, and the subband PMI includes an odd subband PMI and / or an even subband PMI.

6. The method according to any one of claims 1 to 5, characterized in that The correlation between channel coefficients corresponding to any two resources among the N resources is greater than or equal to a first threshold.

7. The method according to any one of claims 1 to 6, characterized in that Before determining the first channel state information CSI, the method further includes: Second indication information is received from the network device, where the second indication information is used to indicate that the N resources belong to a first resource group, where the first resource group is a resource group that includes at least one resource in the resource set.

8. The method according to claim 7, characterized in that The first dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent; and / or, The second dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent.

9. A channel state information feedback method, applied to a network device, characterized in that: The method comprises: Receive a first CSI from a terminal device, where the first CSI includes a first RI and / or a first PMI, where the first RI is the RI corresponding to N reference signals, and the first PMI is the PMI corresponding to the N reference signals. The N reference signals correspond one-to-one to N resources in a resource set, and N is an integer greater than 1.

10. The method according to claim 9, characterized in that Before receiving the first CSI from the terminal device, the method further includes: Send first indication information to the terminal device, where the first indication information is used to indicate whether the first CSI includes the first RI and / or the first PMI.

11. The method according to claim 9 or 10, characterized in that The first PMI is a wideband PMI and / or a subband PMI, and the subband PMI includes an odd subband PMI and / or an even subband PMI.

12. The method according to any one of claims 9 to 11, characterized in that Before receiving the first CSI from the terminal device, the method further includes: Send second indication information to the terminal device, where the second indication information is used to indicate that the N resources belong to a first resource group, and the first resource group is a resource group that contains at least one resource in the resource set.

13. The method according to claim 12, characterized in that The first dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent; and / or, The second dimension indexes of at least two beams selected by any two resources in the first resource group are the same or adjacent.

14. A channel state information feedback device, characterized in that: The channel state information feedback apparatus includes a functional module for implementing the channel state information feedback method according to any one of claims 1 to 8, or includes a functional module for implementing the channel state information feedback method according to any one of claims 9 to 13.

15. A channel state information feedback device, characterized in that: include: processor and memory; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the channel state information feedback apparatus performs the channel state information feedback method according to any one of claims 1 to 8, or any one of claims 9 to 13.

16. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the channel state information feedback method according to any one of claims 1 to 8, or any one of claims 9 to 13 when executed by a processor.

17. A computer program product, characterized in that The method comprises a computer program, which, when executed by a processor, implements the channel state information feedback method according to any one of claims 1 to 8, or any one of claims 9 to 13.

Images