Method, terminal device, network device and computer readable medium for communication

Abstract

Embodiments of the present disclosure provide a scheme for CSI reporting. In a method for communication, a terminal device receives one or more configurations for at least one of a first channel state (CSI), a second CSI, or a third CSI in a CSI reporting setting. The one or more configurations in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The terminal device transmits, to a network device, at least one of the first CSI, the second CSI, or the third CSI based on the one or more configurations.

Description

Technical Field

[0001] The embodiments disclosed herein generally relate to the field of communications, and more specifically, to schemes for channel state information (CSI) reporting. Background Technology

[0002] 5G New Radio (NR) is a global standard for a unified and more capable 5G wireless air interface. 5G enables a new type of network designed to virtually connect everyone and everything, including machines, objects, and devices. Multiple-input multiple-output (MIMO) technology is a method for multiplying the capacity of radio links by using multiple transmit and receive antennas to take advantage of multipath propagation. MIMO includes features that facilitate the use of a large number of antenna elements at the base station (BS) for both sub-6 GHz and above 6 GHz. In Rel-17 of the 3rd Generation Partnership Project (3GPP), further enhanced MIMO (FeMIMO) technology was introduced to improve beamforming and beam control management and reduce associated overhead. Furthermore, in Rel-17, the Description of Work (WID) for FeMIMO in NR has been agreed to enhance CSI measurements and reporting for multi-transmit / receive points (multi-TRP).

[0003] Regarding CSI measurements associated with CSI reporting settings for Noncoherent Joint Transmission (NCJT), it has been recognized that the Non-Zero Power (NZP) Channel State Information Reference Signal (CSI-RS) resource for channel measurements should be associated at the resource level with different TRP / Transmission Configuration Indication (TCI) states (at least for schemes based on multiple downlink control indications (DCI) and single DCI).

[0004] However, there is no suitable scheme for CSI reporting, especially regarding multi-TRP transports, and therefore, it remains unable to benefit from it. Therefore, an improved CSI reporting scheme is needed in NR systems. Summary of the Invention

[0005] Overall, the embodiments of this disclosure provide a scheme for CSI reporting.

[0006] In a first aspect, a method for communication is provided. The method includes, at a terminal device, receiving one or more configurations for at least one of a first CSI, a second CSI, or a third CSI in a first Channel State Information (CSI) report setting. The one or more configurations in the CSI report setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The method further includes transmitting at least one of the first CSI, the second CSI, or the third CSI to a network device based on the one or more configurations.

[0007] In a second aspect, a method for communication is provided. The method includes, at a network device, transmitting one or more configurations for at least one of a first CSI, a second CSI, or a third CSI in a Channel State Information (CSI) report setting. The one or more configurations in the CSI report setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The method also includes, at the network device, receiving at least one of the first CSI, the second CSI, or the third CSI based on the one or more configurations.

[0008] In a third aspect, a terminal device is provided. The terminal device includes a processor configured to perform the method according to the first aspect.

[0009] In the fourth aspect, a first network device is provided. This network device includes a processor configured to perform the method according to the second aspect.

[0010] In a fifth aspect, a computer-readable medium is provided having instructions stored thereon. When the instructions are executed on at least one processor of a device, the instructions cause the device to perform the method according to the first aspect.

[0011] In a sixth aspect, a computer-readable medium is provided having instructions stored thereon. When the instructions are executed on at least one processor of a device, the instructions cause the device to perform the method according to the second aspect.

[0012] It should be understood that the summary section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0013] The above and other aspects, features, and benefits of various embodiments of the present disclosure will become more fully apparent from the following detailed description with reference to the accompanying drawings, in which the same reference numerals are used to denote the same or equivalent elements. The drawings are illustrated to facilitate a better understanding of embodiments of the present disclosure and are not necessarily drawn to scale; in the drawings:

[0014] Figure 1 A schematic diagram of a communication environment in which some embodiments of the present disclosure may be implemented is shown;

[0015] Figure 2 A flowchart of a communication method according to an embodiment of the present disclosure is shown;

[0016] Figure 3 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0017] Figure 4 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0018] Figure 5 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0019] Figure 6 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0020] Figure 7 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0021] Figure 8 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0022] Figure 9 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0023] Figure 10 A schematic diagram of a CSI report according to an embodiment of the present disclosure is shown;

[0024] Figure 11 A schematic diagram illustrating CSI report settings according to an embodiment of this disclosure;

[0025] Figure 12 A flowchart illustrating another communication method according to an embodiment of the present disclosure is shown; and

[0026] Figure 13 A simplified block diagram of a communication device 1300 that can implement CSI reporting according to embodiments of the present disclosure is shown schematically.

[0027] In all the accompanying drawings, the same or similar reference numerals denote the same or similar elements. Detailed Implementation

[0028] The principles of this disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are described for illustrative purposes only and to assist those skilled in the art in understanding and implementing this disclosure, and are not intended to limit the scope of the disclosure in any way. The disclosure described herein can be implemented in various ways other than those described below.

[0029] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains.

[0030] As used herein, the terms "network device" or "base station" (BS) refer to a device capable of providing or controlling a cell or coverage area in which terminal devices can perform communications. Examples of network devices include, but are not limited to, Node B (NodeB or NB), evolved Node B (eNodeB or eNB), next-generation Node B (gNB), infrastructure equipment for V2X (vehicle-to-everything) communications, transmit / receive points (TRPs), remote radio units (RRUs), radio heads (RHs), remote radio heads (RRHs), low-power nodes such as femtonodes, piconodes, etc.

[0031] When used herein, the term "terminal device" refers to any device with wireless or wired communication capabilities. Examples of terminal devices include, but are not limited to, user equipment (UE), personal computers, desktops, mobile phones, cellular phones, smartphones, personal digital assistants (PDAs), portable computers, tablets, wearable devices, Internet of Things (IoT) devices, various Internet of Things (IoE) devices, machine-type communication (MTC) devices, devices on vehicles used for V2X communication (where X represents a pedestrian, vehicle, or infrastructure / network), or image capture devices such as digital cameras, gaming devices, music storage and playback devices, or Internet devices that allow wireless or wired Internet access and browsing, etc. For purposes of discussion, some embodiments will be described below with reference to UE as an example of a terminal device, and the terms "terminal device" and "user equipment" (UE) may be used interchangeably in the context of this disclosure.

[0032] In some embodiments, the terminal device may be connected to a first network device and a second network device. One of the first network device and the second network device may be a master node, and the other may be a slave node. The first network device and the second network device may use different Radio Access Technologies (RATs). In some embodiments, the first network device may be a first RAT device, and the second network device may be a second RAT device. In some embodiments, the first RAT device is an eNB, and the second RAT device is a gNB. Information related to different RATs may be sent from at least one of the first network device and the second network device to the terminal device. In some embodiments, first information may be sent from the first network device to the terminal device, and second information may be sent directly or via the first network device from the second network device to the terminal device. In some embodiments, information related to the configuration of the terminal device configured by the second network device may be sent via the first network device from the second network device. Information related to the reconfiguration of the terminal device configured by the second network device may be sent directly or via the first network device from the second network device to the terminal device. Information may be transmitted in any of the following ways: Radio Resource Control (RRC) signaling, Media Access Control (MAC) control element (CE), or Downlink Control Information (DCI).

[0033] As used herein, the term "circuit" can refer to hardware circuitry and / or a combination of hardware circuitry and software. For example, a circuit can be a combination of analog and / or digital hardware circuitry with software / firmware. As another example, a circuit can be any part of a hardware processor with software, including digital signal processors, software, and memory, which work together to enable a device, such as a terminal device or network device, to perform various functions. In yet another example, a circuit can be hardware circuitry and / or a processor, such as a microprocessor or a portion thereof, that requires software / firmware to operate, but may be absent when the software is not required to operate. As used herein, the term "circuit" also encompasses only the implementation of hardware circuitry or a processor or a portion thereof and its accompanying software and / or firmware.

[0034] As used herein, the terms “transmit / receive point,” “transmit / receive point,” or “transmit and receive point” generally refer to a station communicating with user equipment. However, transmit and receive points can be referred to by different terms such as base station (BS), cell, node B, evolved Node B (eNB), next-generation Node B (gNB), transmit / receive point (TRP), sector, site, base transceiver system (BTS), access point (AP), relay node (RN), remote radio head (RRH), radio unit (RU), antenna, etc.

[0035] That is, in the context of this disclosure, the transmission and reception point, base station (BS), or cell can be interpreted as an inclusive concept, indicating a portion of an area or function covered by the Base Station Controller (BSC) in Code Division Multiple Access (CDMA), the Node B in WCDMA, the eNB or sector (site) in LTE, the gNB or TRP in NR, etc. Therefore, the concepts of transmission and reception point, base station (BS), and / or cell can include various coverage areas, such as megacells, macrocells, microcells, picocells, femtocells, etc. Furthermore, this concept can include the communication range of a relay node (RN), remote radio head (RRH), or radio unit (RU).

[0036] In the context of this disclosure, "user equipment" and "transmit / receive point" can refer to two inclusive transmission / receive entities used to embody the techniques and concepts disclosed herein, and are not limited to specific terms or phrases. Furthermore, "user equipment" and "transmit / receive point" can refer to uplink or downlink transmission / receive entities used to embody the techniques and concepts disclosed herein, and are not limited to specific terms or phrases. As used herein, uplink (UL) transmission / receive is a scheme for transmitting data from the user equipment to the base station. Alternatively, downlink (DL) transmission / receive is a scheme for transmitting data from the base station to the user equipment.

[0037] As used herein, the terms “resource,” “transmission resource,” “resource block,” “physical resource block,” “uplink resource,” or “downlink resource” can refer to any resource used to perform communication (e.g., communication between a terminal device and a network device), such as resources in the time domain, resources in the frequency domain, resources in the spatial domain, resources in the code domain, or any other resource that allows communication. In the following, resources in the frequency and time domains will be used as examples of transmission resources used to describe some embodiments of this disclosure. Note that embodiments of this disclosure are equally applicable to other resources in other domains.

[0038] As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context explicitly indicates otherwise. The term “comprising” and its variations should be interpreted as open-ended terms meaning “including, but not limited to.” The term “based on” should be understood as “at least partially based on.” The terms “an embodiment” and “embodiment” should be understood as “at least one embodiment.” The term “another embodiment” should be understood as “at least one other embodiment.” The terms “first,” “second,” etc., may refer to different or the same objects. Other explicit and implicit definitions may be included below.

[0039] In some examples, values, processes, or devices are referred to as “best,” “lowest,” “highest,” “minimum,” “maximum,” etc. It should be understood that such descriptions are intended to indicate that a selection can be made from many functional alternatives used, and that such a selection does not need to be better, smaller, higher, or more preferred than the others.

[0040] As stated above, in 3GPP Rel-17, the WID regarding FeMIMO in NR has agreed to enhance CSI measurements and reporting for multi-TRP (multi-transmission point) systems. It has been recognized that for CSI measurements associated with NCJT CSI reporting settings, the NZP CSI-RS resources used for channel measurements should be associated at the resource level with different TRP / TCI states (at least for multi-DCI-based and single-DCI-based schemes). For CSI reporting associated with the multi-TCP / panel NCJT measurement assumption configured by a single CSI reporting setting, when the maximum transport layer is less than or equal to 4, for single-DCI-based NCJT, it is expected that the UE will report two RIs, two precoding matrix indices (PMIs), two layer indices (LIs), and one CQI per codeword.

[0041] Furthermore, for CSI reporting, there are three alternative options for the CSI reporting mechanism. For alternative option 1, if configured, the UE can be expected to report one CSI associated with the best single-TRP measurement assumption and one CSI associated with the best NCJT measurement assumption. For alternative option 2, if configured, the UE can be expected to report one CSI associated with the best of the NCJT and / or single-TRP measurement assumptions. Regarding alternative option 3, if configured, the UE can be expected to report two CSIs associated with the two best single-TRP measurement assumptions related to the Channel Measurement Resources (CMR) from both TRPs, and one CSI associated with the best NCJT measurement assumption.

[0042] In the radio access network RAN1#103e, it is agreed to study various measurement resource configuration / association mechanisms for NCJTCSI measurements configured using a single report setting, such as whether / how to support interference measurements based on NZPCSI-RS given by nzp-CSI-RS-ResourcesForInterference or based on CSI-Interference Measurement (IM) given by csi-IM-ResourcesForInterference, whether / how to interpret CMR measurements based on different TRP / TCI states respectively associated with the assumptions used for NCJT measurements, CMR / IM resource (IMR) resource configuration constraints / associations, such as for reference resources / time domain characteristics / frequency domain characteristics, etc.

[0043] In current NR systems, the CSI-RS Resource Indicator (CRI) is used to indicate the CSI-RS resource selected from a set of multiple CSI-RS resources configured for CSI reports (NZP CSI-RS resource sets). The bit width of the CRI is determined based on the number of CSI-RS resources in the corresponding resource set and a subset of the transmission codebook, and the RI can be limited to reduce computational complexity and signaling overhead. However, the above scheme in current NR systems is not suitable for multi-TRP NCJT scenarios, and there is no appropriate design for CRS or CSI report settings in existing schemes.

[0044] To address the aforementioned technical problems and other potential technical issues in conventional solutions, embodiments of this disclosure provide a scheme for CSI reporting. In some embodiments, a terminal device receives one or more configurations in a CSI reporting setting for at least one of a first CSI, a second CSI, or a third CSI, wherein the one or more configurations in the CSI reporting setting include at least two rank restrictions or at least two codebook subset restrictions (CBSRs). The terminal device sends at least one of the first CSI, the second CSI, and the third CSI to a network device based on one or more configurations in the CSI report.

[0045] Utilizing embodiments of this disclosure, one or more additional CSIs are further introduced to support CSI feedback for multi-TRP NCJT scenarios or to support dynamic transmission. Additionally or alternatively, new schemes for RI-limited and / or CBSR-limited constraints are also proposed to further reduce computational complexity and system overhead.

[0046] The solutions presented in this disclosure will be described in further detail below with reference to the accompanying drawings. However, it should be understood that the following embodiments are given for illustrative purposes only and the invention is not limited thereto. Furthermore, the solutions provided herein can be used in NR systems or any other communications with similar problems.

[0047] Figure 1 A schematic diagram of a communication environment 100 in which some embodiments of the present disclosure may be implemented is shown. For example... Figure 1 As shown, the communication environment 100, also known as communication network 100 or communication system 100, includes a first TRP 110 (TRP1), a second TRP 120 (TRP2), and a terminal device 130. Specifically, the terminal device 130 can communicate with the first TRP 110 and the second TRP 120 via communication links. For transmissions from TRPs 110 and 120 to the terminal device 120, the communication link can be referred to as a downlink, while for transmissions from the terminal device 130 to TRPs 110 and 120, the communication link can be referred to as an uplink.

[0048] The communication environment 100 can conform to any suitable standard, including but not limited to Global System for Mobile Communications (GSM), Long Term Evolution (LTE), LTE Evolution, LTE-A Advanced, Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), GSM EDGE Radio Access Network (GERAN), Machine Type Communication (MTC), etc. Furthermore, communication can be performed according to any generation of communication protocols currently known or to be developed in the future. Examples of communication protocols include, but are not limited to, first-generation (1G), second-generation (2G), 2.5G, 2.75G, third-generation (3G), fourth-generation (4G), 4.5G, and fifth-generation (5G) communication protocols.

[0049] Network 100 (e.g., gNB) may be equipped with one or more TRPs or antenna panels. As used herein, the term "TRP" refers to an antenna array (with one or more antenna elements) available to a network device located in a specific geographic location. For example, a network device may be coupled with multiple TRPs in different geographic locations to achieve better coverage. One or more TRPs may be included in the same serving cell or in different serving cells.

[0050] It should be understood that a TRP can also be a panel, and a panel can also refer to an antenna array (having one or more antenna elements). Although some embodiments of this disclosure are described with reference to, for example, multiple TRPs, these embodiments are for illustrative purposes only and to help those skilled in the art understand and implement this disclosure, and are not intended to imply any limitation on the scope of this disclosure. It should be understood that the disclosure described herein can be implemented in various ways other than those described below.

[0051] exist Figure 1 In the exemplary scenario shown, environment 100 supports transmissions from a single TRP to terminal device 130, such as from a first TRP 110 or a second TRP 120, and this transmission can also be referred to as a single TRP transmission. Furthermore, terminal device 130 can simultaneously receive transmissions from multiple network devices, such as transmissions from both the first and second network TRPs 110 and 120, and this transmission can be referred to as a multi-TRP transmission. In some embodiments of this disclosure, the two TRPs 110 and 120 may be contained in the same network device. In some embodiments of this application, these TRPs may be contained in two different network devices.

[0052] For example, such as Figure 1As shown, environment 100 can communicate with terminal device 130 via at least one of TRP 110 and TRP 120. TRP 110 and TRP 120 can be included in the same serving cell or different serving cells. Although some embodiments of this disclosure have been described with reference to TRP 110 and TRP 120 within the same serving cell, these embodiments are for illustrative purposes only and to help those skilled in the art understand and implement this disclosure, and are not intended to imply any limitation on the scope of this disclosure. It should be understood that the disclosure described herein can be implemented in various ways other than those described below.

[0053] Network devices require channel state information for transmission scheduling or transmission parameter selection or configuration. The network device sends the configuration for CSI reporting to terminal device 130 in the CSI reporting settings via, for example, Radio Resource Control (RRC) signaling. Based on the configuration in the CSI reporting settings, terminal device 130 performs measurements, such as channel measurements and / or interference measurements, and sends a CSI report to the network device.

[0054] The embodiments disclosed herein can be applied to CSI reporting and CSI reporting settings in communication environment 100, as will be described below with reference to Figures 2 to 11 Describe the details.

[0055] Figure 2 A flowchart of an example method 200 for communication according to an embodiment of this application is shown. The communication method 200 can be performed at a terminal device such as UE 130.

[0056] like Figure 2 As shown, in block 210, the terminal device receives one or more configurations for at least one of a first channel state information (CSI), a second CSI, or a third CSI in the CSI report settings. The one or more configurations in the CSI report settings include at least two rank restrictions or at least two codebooks. In block 220, the terminal device may send at least one of the first CSI, the second CSI, or the third CSI to the network device based on one or more configurations.

[0057] Detailed instructions on CSI report setup and reporting will be provided below. Figures 3 to 11 To describe.

[0058] Figure 3 A schematic diagram of a CSI report according to an embodiment of this disclosure is shown. (As...) Figure 3As shown, in some embodiments of this disclosure, there may be N CSI-RS resources (N is a positive integer, e.g., 2 ≤ N ≤ 64) within a CSI-RS resource set, and each CSI-RS resource may be associated with a Transport Configuration Indicator (TCI) state. For example, the TCI state is configured via at least one of RRC, MACCE, and DCI signaling, which includes the configuration of quasi-colocation relationships. In some embodiments, the N CSI-RS resources may be divided into two subsets (subset A and subset B). Subset A includes, for example, N1 CSI-RS resources (N1 is a positive integer, e.g., 1 ≤ N1 ≤ N-1), and subset B includes N2 CSI-RS resources (N2 is a positive integer, e.g., N2 = N - N1). For example, the N1 CSI-RS resources in subset A are those used for CSI measurements associated with TRP1, while the N2 CSI-RS resources in subset B are those used for CSI measurements associated with TRP2.

[0059] CSI-RS resources can be mapped to subsets A and B in different ways. In some embodiments of this disclosure, each of subsets A and B comprises half of the CSI-RS resources. For example, subset A comprises a first half of the CSI-RS resources, and subset B comprises a second half. For example, N1 = ceil(N / 2), and N2 = N - N1. Or, N1 = floor(N / 2), and N2 = N - N1. Or, N1 = N / 2, and N2 = N / 2. In some embodiments of this disclosure, resource lists can also be maintained separately for each of subsets A and B. For example, a CSI-RS resource list is maintained for subset A, and another CSI-RS resource list is maintained for subset B. In this case, the number of CSI-RS resources in subset A can be the same as or different from that in subset B.

[0060] In some embodiments of this disclosure, a CSI report may have three CSIs, including, for example, CSI A, CSI B, and CSI C. Of these three CSIs, CSI A and / or CSI B may be CSIs for a single TRP transmission. For example, they may be associated with two TRPs respectively. CSI C may be a CSI for an NCJT scenario.

[0061] Note that in a CSI report instance, at least one of CSI A, CSI B, and CSI C may be included depending on network configuration or requirements. For example, for a single TRP transport, the terminal device may report only the optimal CSI among the CSIs for TRP1 and TRP2, or report the optimal CSI related to TRP1 and the optimal CSI related to TRP2. Alternatively, the CSI report may include CSI C for NCJT scenarios. Or, in addition to one or both of CSI A and CSI B, the CSI report may include CSI C for NCJT scenarios. The CSI report settings from the network device may also include configurations for at least one CSI, such as at least one of CSI A, CSI B, or CSI C. The reporting of CSI A, CSI B, and CSI C will be described in detail below with reference to the accompanying drawings.

[0062] ■ CSI A / B for Single TRP Transmission

[0063] In some embodiments of this application, a CSI report may include one or both of CSI A and CSI B. For example, only one CSI RI (e.g., for a single TRP transport) may be reported, and the CRI may correspond to a CSI-RS resource in the CSI-RS resource set. In some embodiments of this application, a CSI is determined from N CSI-RS resources in the CSI-RS resource set, and only the CSI, such as CSI A or CSI B, is reported.

[0064] like Figure 4 As shown, in some embodiments, for CSI A, it may include at least one of a CRI (first CRI CRI_1), a PMI (first PMI PMI_1), and an RI (first RI RI_1). In some embodiments, for CSI B, it may include at least one of a CRI (second CRI CRI_2), a PMI (second PMI PMI_2), and an RI (second RI RI_2). In some embodiments, the bit size of the CRI in CSI A or B may be determined as ceil(log2(N)). In some embodiments, the bit size of the CRI in CSI A or B may be determined as ceil(log2(max(N1, (N-N1))). For example, in a CSI reporting setup, there may be a configuration for only one CSI with one CRI, which may be applied to CSI A or CSI B. Alternatively, the CSI reporting setup may also include two CSIs, each with one CRI applied to CSI A and CSI B respectively.

[0065] ■ CSI C for Multi-TRP Transmission

[0066] In some embodiments of this application, such as Figure 4 As shown, CSI C (e.g., for the NCJT scenario) may include two CRIs (first CRI CRI_3 and second CRI CRI_4), two RIs (first RI RI_3 and second RI RI_4), and two PMIs (first PMI PMI_3 and second PMI PMI_4). CRI_3 may correspond to the CSI-RS resource (C1) in subset A, while CRI_4 may correspond to the CSI-RS resource (C2) in subset B. For example, PMI_3 may be calculated based on C1 as a channel measurement resource (CMR) and / or based on C2 as an interference measurement resource (IMR), and PMI_4 may be calculated based on C2 as a CMR and / or based on C1 as an IMR. In this case, the bit size of CRI_3 may be determined as ceil(log2(N1)), and the bit size of CRI_4 may be determined as ceil(log2(N-N1)).

[0067] Figure 5 Another approach for CSI reporting according to an embodiment of this application is shown. For example... Figure 5 As shown, similarly, the CSI-RS resource set comprises N (N is a positive integer, e.g., 2 ≤ N ≤ 64) CSI-RS resources, each CSI-RS resource being associated with a TCI state. The N CSI-RS resources can be divided into two subsets (subset A and subset B), where subset A comprises N1 CSI-RS resources (N1 is a positive integer, e.g., 1 <= N1 <= N-1), and subset B comprises N2 CSI-RS resources (N2 is a positive integer, e.g., N2 = N - N1). In subset A, there exist M CSI-RS resources (S1) (M is a positive integer. For example, 1 ≤ M ≤ N1. Also, 1 <= M <= max(N1, (N-N1)), which are associated with M CSI-RS resources (S2) in subset B. For example, each CSI-RS resource in S1 is associated with one CSI-RS resource in S2. In other words, for subsets A and B, associations are established between the two CSI-RS resources in each of the M pairs of CSI-RS resources. Such associations can reduce the computational complexity of CSI measurements and / or the system overhead of CSI reporting.

[0068] In some embodiments, a CSI reporting setup may include at least one CSI, such as at least one of CSI A, CSI B, and CSI C. For CSI A and / or B (e.g., for a single TRP transport), the CSI report may be associated with a reference. Figure 3 The description is identical, meaning it includes at least one of a CRI, a PMI, and an RI. Specifically, for each CSI, one CRI is reported and corresponds to a CSI-RS resource in the CSI-RS resource set. This is consistent with the description of CSI C reporting two CRIs (e.g., for the NCJT assumption). Figure 3 The CSI reports shown differ; CSI C may report only one CRI, corresponding to both the CSI-RS resource in subset A and the associated CSI-RS resource in subset B. The reporting for CSI A, CSI B, and CSI C will be described in detail below.

[0069] ■ CSI A / B for Single TRP Transmission

[0070] In some embodiments of this disclosure, only one of CSI A and CSI B may be reported (e.g., for a single TRP transmission). For example, a CSI may be determined from N CSI-RS resources in a CSI-RS resource set, and only one of CSI A or CSI B may be reported. In some embodiments, the bit size of the CRI in CSI A or B may be determined as ceil(log2(N)). In some embodiments, the bit size for the CRI in CSI A or B may be determined as ceil(log2(max(N1, (N-N1))). In some embodiments, CSI reporting settings may include a configuration for only one CSI with one CRI. For example, when only one of CSI A or CSI B exists (e.g., for a single TRP transmission).

[0071] In some embodiments of this disclosure, both CSI A and CSI B can be reported (e.g., for a single TRP transmission). In some embodiments, the bit size of the CRI in CSI A can be determined as ceil(log2(N-1)), and the bit size of the CRI in CSI B can be determined as ceil(log2(N-N1)). In some embodiments, the bit size of the CRI in CSI A can be determined as ceil(log2(N)), and the bit size of the CRI in CSI B can be determined as ceil(log2(max(N1,(N-N1))), and the bit size of the CRI in CSI B can be determined as ceil(log2(max(N1,(N-N1))). For example, in this case, the CSI reporting settings can include a configuration for two CSIs, each having one CRI.

[0072] In some embodiments of this application, the bit size of the CRI in CSI A can be determined as ceil(log2(N1-M)), and the bit size of the CRI in CSI B can be determined as ceil(log2(N-N1-M)). For example, M pairs of CSI-RS cannot be used for a single TRP transmission. In this case, the CSI reporting settings can include a configuration for two CSIs, each with one CSI.

[0073] ■ CSI C for Multi-TRP Transmission

[0074] When there are M associated CSI-RS resource pairs in subsets A and B, only one CRI can be reported for CSI C (e.g., for the NCJT scenario). Figure 6 As shown. For multiple TRP transmissions, only one CRI CRI_3' is reported, and CRI CRI_3' can correspond to a CSI-RS resource in S1 and an associated CSI-RS resource in S2. In some embodiments, the bit size of the CRI in CSIC can be determined as ceil(log2(M)).

[0075] In some embodiments, CSI C may also include two PMIs, PMI_3 and PMI_4, and / or two RIs, RI_3 and RI_4. For example, in S1, PMI_3 / RI_3 may be determined based on the CSI-RS resource corresponding to the CRI, and in S2, PMI_4 / RI_4 may be determined based on the CSI-RS resource corresponding to the CRI.

[0076] Figure 7 Another scheme for CSI reporting according to an embodiment of this application is illustrated, wherein two CSI-RS resources in different subsets are associated in different ways for use in multi-TRP transmissions. In some embodiments, such as Figure 7 As shown, the CSI-RS resource set includes, for example, N CSI-RS resources (N is a positive integer; for example, 2 ≤ N ≤ 64), and is divided into two groups, G1 and G2. In group G1, there are N1 CSI-RS resources (N1 is an integer, and 2 ≤ N1 ≤ N), where each CSI-RS resource is associated with two TCI states. In group G2, there are N2 CSI-RS resources (for example, N2 = N - N1), where each CSI-RS resource is associated with one TCI state. In group G1, CSI-RS resources associated with the same two TCI states are considered a pair of CSI-RS resources and are associated with each other. For example, this pair of two CSI-RS resources can be used in NCJT scenarios.

[0077] Alternatively, in some embodiments, group G1 may have N3 CSI-RS resource pairs (N3 is an integer, and 1 ≤ N3 ≤ floor(N / 2)), wherein each CSI-RS resource in the resource pair is associated with two TCI states, such as Figure 8 As shown. In this case, N3 = N1 / 2 or N1 = 2 * N3, and group G1 includes N2 CSI-RS resources (N2 = N - 2 * N3).

[0078] In some embodiments of this disclosure, CSI reporting settings may include configurations for at least one CSI (e.g., at least one of CSI A, CSI B, and CSI C). For each of CSI A or B (e.g., for a single TRP transport), at least one of a CRI, a PMI, and a RI may be reported, and the CRI may correspond to a CSI-RS resource associated with a TCI state in the CSI-RS resource set. For CSI C (e.g., the NCJT assumption), one CRI, two PMIs, and two RIs may be reported, and the CRI may correspond to two CSI-RS resources or a pair of CSI-RS resources associated with the same two TCI states in G1. Reporting for CSI A, CSI B, and CSI C will be described in detail below.

[0079] ■ CSI A / B for Single TRP Transmission

[0080] In some embodiments of this disclosure, the CSI report settings include a configuration for only one CSI with one CRI. For example, CSI-RS resources in G1 are dedicated to multi-TPR transmissions, while CSI-RS resources in G2 are dedicated to single-TPR transmissions. In some embodiments, the bit size of the CRI in CSI A or CSI B can be determined as ceil(log2(N-N1)). For example, the CSI report includes only one of CSI A and CSI B. In another example, the CSI report also includes CSI C.

[0081] In some embodiments of this disclosure, CSI report settings may include a configuration for only one CSI with one CRI. For example, CSI-RS resources in G1 may be dedicated to multi-TPR transmissions, but CSI-RS resources in both G1 and G2 may be used for single-TPR transmissions. In some embodiments, if a corresponding CSI-RS resource is associated with two TCI states, one of the two TCI states may be used for channel measurements of CSI A or CSI B. For example, the first of the two TCI states may be applied. For another example, two CSI-RSs may exist associated with the same two TCI states, and for a first CSI-RS resource, the first of the two TCI states may be used, and for a second CSI-RS resource, the second of the two TCI states may be used. In some embodiments, the bit size of the CRI in CSI A or CSI B may be determined as ceil(log2(N)). For example, the CSI report may include only one of CSI A and CSI B. Furthermore, the CSI report may further include CSI C.

[0082] In some embodiments of this disclosure, CSI reporting settings may include a configuration for each of the two CSIs having one CRI, and in this case, both CSI A and CSI B may be reported. In some embodiments, the bit size for the CRI in CSI A or B is ceil(log2(N-N1)). For example, if a single TPR transmission can only use the CSI-RS resources in G2. In some embodiments, the bit size for the CRI in CSI A or B is ceil(log2(N)). For example, if a single TPR transmission can use all resources in the CSI-RS resource set. In some embodiments, if a corresponding CSI-RS resource is associated with two TCI states, one of the two TCI states may be available for channel measurements of CSI A or CSI B. For example, the first of the two TCI states may be applied. For another example, two CSI-RSs may exist associated with the same two TCI states, and for a first CSI-RS resource, the first of the two TCI states may be used, and for a second CSI-RS resource, the second of the two TCI states may be used.

[0083] ■ CSI C for Multi-TRP Transmission

[0084] In some embodiments, CSI C (e.g., for NCJT assumptions) may include one CRI CRI_3 and / or two PMIs PMI_3, PMI_4 and / or two RIs RI_3, RI_4. This is, for example, due to the association of CSI-RS resources in G1. Figure 9As shown, CRI_3 can correspond to two CSI-RS resources associated with the same two TCI states in CSI-RS resource set G1. In some embodiments, the bit size of CRI in CSI C can be determined as ceil(log2(N1 / 2)) or ceil(log2(N3)).

[0085] In some embodiments, each value of CRI may correspond to a first CSI-RS resource that is associated with two CSI-RS resources that share the same two TCI states. For example, for CSI-RS resources with the same two TCI states, only the first CSI-RS resource is counted in the CRI index determination, while the second CSI-RS resource is not counted. In some embodiments, the value of CRI is associated with the ascending order of the CSI-RS resources, and the CSI-RS resources are associated with two different TCI states.

[0086] As an example, G1 contains four CSI-RS resources: CSI-RS resource Re1 (TCI states T1, T2), CSI-RS resource Re2 (TCI states T1, T2), CSI-RS resource Re3 (TCI states T3, T4), and CSI-RS resource Re4 (TCI states T3, T4). Among these four resources, the first CSI-RS resource Re1 is associated with the second CSI-RS resource Re2, which has the same TCI states T1, T2, and the third CSI-RS resource Re3 is associated with the fourth CSI-RS resource Re4, which has the same TCI states T3, T4. In this case, the CRI index only counts CSI-RS resource Re1 in the first pair of associated CSI-RS resources and CSI-RS resource Re3 in the second pair of associated CSI-RS resources. For example, for the first pair of associated CSI-RS resources Re1 and Re2, CRI can be determined as CRI=0, while for the second pair of associated CSI-RS resources Re3 and Re4, CRI can be determined as CRI=1, and so on.

[0087] As another example, G1 contains four CSI-RS resources: CSI-RS resource Re1 (TCI states T1, T2), CSI-RS resource Re2 (TCI states T3, T4), CSI-RS resource Re3 (TCI states T1, T2), and CSI-RS resource Re4 (TCI states T3, T4). Of these four resources, the first CSI-RS resource Re1 is associated with the third CSI-RS resource Re3, which has the same TCI states T1, T2, and the second CSI-RS resource Re2 is associated with the fourth CSI-RS resource Re4, which has the same TCI states T3, T4. In this case, the CRI index only counts CSI-RS resource Re1 in the first pair of associated CSI-RS resources and CSI-RS resource Re2 in the second pair of associated CSI-RS resources. For example, for the first pair of associated CSI-RS resources Re1 and Re3, CRI can be determined as CRI=0, while for the second pair of associated CSI-RS resources Re2 and Re4, CRI can be determined as CRI=1, and so on.

[0088] In some embodiments of this application, PMI_3 / RI_3 can be calculated / determined based on CSI-RS resource Re1 corresponding to CRI in G1, and PMI_4 / RI_4 can be calculated / determined based on CSI-RS resource Re2 corresponding to CRI in G1.

[0089] For ease of understanding this disclosure, Figure 10 A high-level diagram illustrating CSI reports and CSI report settings according to embodiments of this application is shown. Figure 10As shown, CSI reporting settings may include configurations for at least one of CSI A, CSI B, and CSI C. For example, of the three CSIs, CSI A and / or CSI B may be used for, for example, a single TRP transport, and they may be associated with two TRPs respectively. Unlike CSI A / CSI B, CSI C may be used in NCJT scenarios. In some embodiments, CSI reporting may be based on the configuration in the CSI reporting settings. For example, if the CSI reporting settings contain a configuration for only one CSI with one CRI (e.g., for a single TRP transport), the terminal device may report only one of CSI A or CSI B, or the terminal device may report only CSI A. For another example, if the CSI reporting settings contain a configuration for two CSIs each with one CRI (e.g., for a single TRP transport), the terminal device may report both CSI A and CSI B. Additionally or alternatively, in some embodiments, the CSI reporting settings may include CSI C. For example, if the CSI reporting settings include configurations regarding CSI for multi-TRP transmissions and single-TRP transmissions, the terminal device can report CSI for single transmissions or multi-transmissions, or both. In some embodiments, CSI A and CSI C can be reported in the CSI report. In some embodiments, CSI A, CSI B, and CSI C can be reported in the CSI report. In some embodiments, CSI C can be reported in the CSI report. In some embodiments, one of CSI A and CSI C can be reported in the CSI report.

[0090] In some other embodiments of this disclosure, or in another aspect of this application, the CSI report settings may include at least one of two rank limits or at least two codebook subset limits (CBSRs). For example, rank limits and CBSRs may be associated with single TRP transmissions or multi-TRP transmissions.

[0091] Figure 11 Example configurations included in CSI reporting settings according to some embodiments of this application are shown. Figure 11 As shown, in some embodiments, the CBSR may include at least one of a first CBSR CBSR_1, a second CBSR CBSR_2, a third CBSR CBSR_3, a fourth CBSR CBSR_4, and a fifth CBSR CBSR_5. Additionally, or alternatively, in some embodiments, the rank restriction may include at least one of a first rank indicator (RI) restriction RI-Res1, a second RI restriction RI-Res2, a third RI restriction RI-Res3, a fourth RI restriction RI-Res4, and a fifth RI restriction RI-Res5.

[0092] In some embodiments of this disclosure, the first CBSR CBSR_1 and / or the first RI limit RI-Res1 may be associated with a first CSI (e.g., CSI_A for a single TRP transmission). In some embodiments, the first CBSR CBSR_1 and / or the first RI limit RI-Res1 may be used for PMI calculations (or CSI measurements or RI calculations or PMI reports or RI reports or CQI calculations) associated with some CSI-RS resources, for example, denoted as CSI-RS resource X. CSI-RS resource X may include, for example, at least one CSI-RS resource in subset A, or at least one CSI-RS resource having a TCI state (e.g., those resources used for the single TRP transmission assumption, or those resources associated with TRP1). As another example, CSI-RS resource X may include at least one CSI-RS resource in a CSI-RS resource set, or at least one CSI-RS resource having a TCI state (e.g., those resources used for the single TRP transmission assumption, or those resources associated with TRP1 or TRP2).

[0093] Alternatively or additionally, the second CBSR CBSR_2 and / or the second RI limit RI-Res2 are associated with the second CSI (e.g., CSI B for a single TRP transmission). In some embodiments, the second CBSR CBSR_2 and / or the second RI limit RI_res2 may be applied to PMI calculations (or CSI measurements or RI calculations or PMI reports or RI reports or CQI calculations) associated with some CSI-RS resources, for example, denoted as CSI-RS resources Y. CSI-RS resources Y may include at least one CSI-RS resource from subset B or at least one CSI-RS resource having a TCI state (e.g., those resources for the single TRP transmission assumption, or those resources associated with TRP2).

[0094] In some embodiments, the bit size is 8 for the first RI limit and / or the second RI limit. In some embodiments, the bit size is 4 for the first RI limit and / or the second RI limit. For illustrative purposes only, exemplary first and second CSI-RS resource limits including first and second RI limits and exemplary first and second CBSRs are given below.

[0095] Example RI Limitations

[0096] ■ ri-Restriction-1(egRI_res1)BITSTRING(SIZE(8))

[0097] ■ri-Restriction-2(egRI_res2)BIT STRING(SIZE(8))

[0098] or

[0099] ■ ri-Restriction-1(egRI_res1)BITSTRING(SIZE(4))

[0100] ■ri-Restriction-2(egRI_res2)BIT STRING(SIZE(4))

[0101] In the example RI restrictions, RI_res1 can be used for CSI A, and / or RI_res2 can be used for CSI B. For example, both RI restrictions are used for a single TRP transfer, where the underlined restriction can represent, for example, a first RI restriction RI_Res1 associated with TRP1 for reporting a single TRP transfer, and the other restriction can represent, for example, a second RI restriction RI_Res2 associated with TRP2 for reporting a single TRP transfer.

[0102] Example CBSR Limitations

[0103]

[0104]

[0105]

[0106] In the above example CBSR restrictions, the underlined CBSR restrictions (e.g., CBSR_1 and / or CBSR_i2_1) can represent the first CBSR CBSR_1 for CSI A (e.g., for a single TRP transmission CSI report, for example, associated with TRP1); other CBSR restrictions (e.g., CBSR_2 and / or CBSR_i2_2) can represent the second CBSR CBSR_2 for CSI B (e.g., for a single TRP transmission CSI report, for example, associated with TRP2).

[0107] In some embodiments, a first CBSR (e.g., CBSR_1) may correspond to a precoder that is not permitted for use in reporting a first PMI in CSI A. In some embodiments, a first CBSR (e.g., CBSR-i2_1) may correspond to a precoder that is not permitted to be selected for calculating a CQI in CSI A. In some embodiments, a first RI restriction (e.g., RI_res1) may define a first tier number, and precoders associated with the first tier number are not permitted for use in reporting a first PMI and / or a first RI in CSI A. In some embodiments, a first RI restriction (e.g., RI_res1) may define a first tier number that is not permitted for use in reporting a first RI in CSI A. In some embodiments, a second CBSR (e.g., CBSR_2) may correspond to a precoder that is not permitted for use in reporting a second PMI in CSI B. In some embodiments, a second CBSR (e.g., CBSR-i2_2) may correspond to a precoder that is not permitted to be selected for calculating a CQI in CSI B. In some embodiments, a second RI restriction (e.g., RI_res2) may define a second tier number and disallow the precoder associated with the second tier number for reporting the second PMI and / or the second RI in CSI B. In some embodiments, a second RI restriction (e.g., RI_res2) may define a second tier number that disallows the second tier number for reporting the second RI in CSI B.

[0108] Restricting CBSR_1 can define precoders associated with PMI_1 that are not allowed to be used for CQI calculations; restricting RI_res1 can define RIs that are not allowed to be used for PMI_1 and / or RI_1 reporting. Therefore, based on RI_res1 and CBSR_1, the reporting of at least one of the first PMI and the first RI can be restricted. Alternatively or additionally, restricting CBSR_2 can define precoders associated with PMI_2 that are not allowed to be used for CQI calculations; restricting RI_res2 can define RIs that are not allowed to be used for PMI_2 and / or RI_2 reporting. Therefore, based on RI_res1 and CBSR_1, the reporting of at least one of the second PMI and the second RI can be restricted. Thus, computational complexity and overhead can be further reduced.

[0109] Alternatively or additionally, the third CBSR CBSR_3 and / or the third RI limit RI-Res3 are associated with CSI C (e.g., for multi-TRP transport). In some embodiments, the third CBSR CBSR_3 and / or the third RI limit RI_res3 may be applied to two PMI (PMI_3 and PMI_4) calculations / reports and / or two RI (RI_3 and RI_4) calculations / reports (or CSI measurements / reports) and / or CQI calculations in CSI C associated with some CSI-RS resources, for example, denoted as CSI-RS resource Z. CSI-RS resource Z may include CSI-RS resources (e.g., for the NCJT hypothesis). For example, the CSI-RS resource Z may include at least one of CSI-RS resources in subset A and subset B, wherein the CSI-RS resource in subset B is associated with the CSI-RS resource in subset A (e.g., for the NCJT hypothesis), or with a CSI-RS resource having two TCI states (e.g., for the NCJT hypothesis), and so on.

[0110] In some embodiments, the third CBSR CBSR_3 may correspond to a precoder (e.g., a precoder pair (e.g., P1 and P2)) that is not permitted for use in reporting the third PMI and the fourth PMI in CSI C. For example, P1 corresponds to a precoder that is not permitted for use in reporting the third PMI. For another example, P2 corresponds to a precoder that is not permitted for use in reporting the fourth PMI. In some embodiments, the third CBSR CBSR_3 may correspond to a precoder (e.g., a precoder pair (e.g., P1 and P2)) that is not permitted to be selected for calculating the CQI in CSI C. In some embodiments, the third RI restriction RI_res3 may define a third number of layers and a fourth number of layers, and the precoder associated with the third number of layers is not permitted for use in reporting the third PMI and / or the third RI in CSI C, and the precoder associated with the fourth number of layers is not permitted for use in reporting the fourth PMI and / or the fourth RI in CSI C. In some embodiments, the third RI restriction RI_res3 may define a third number of layers and a fourth number of layers, and the third number of layers are not permitted for use in reporting the third RI in CSI C, and the fourth number of layers are not permitted for use in reporting the fourth RI in CSI C.

[0111] CBSR_3 can define precoder pairs (e.g., P1 and P2) that are not allowed for CQI calculations, where P1 is associated with PMI_1 and P2 is associated with PMI_2. Restriction RI_res3 defines RI pairs (R1 and R2) that are not allowed for PMI and / or RI reporting, where R1 is associated with the first RI report RI_3 and R2 is associated with the second RI report RI_4. Therefore, the reporting of the third PMI and the fourth PMI can be restricted based on at least one of the third CBSR and the third RI restriction; and the reporting of the third and fourth RI can be restricted based on at least one of the third CBSR and the third RI restriction.

[0112] For illustrative purposes only, an example third CRI-RS resource limit is given below, including example RI and CBRS limits.

[0113] Example RI Limitations

[0114] ·ri-Restriction-3(egRI_res3) BIT STRING(SIZE(8))

[0115] Example RI Limitations

[0116] ·ri-Restriction-3(egRI_res3)

[0117] R1 BIT STRING (SIZE(4))

[0118] R2 BIT STRING(SIZE(4)

[0119] In the first example RI constraint, the first 4 bits of RI_res3 can be applied to rank constraint R1 related to the reporting of the third RI and / or the third PMI in CSI C, and the remaining 4 bits of RI_res3 can be applied to rank constraint R2 related to the reporting of the fourth RI and / or the fourth PMI in CSI C. In the second example RI constraint, it can include two separate parts for R1 and R2, each part having a size of 4 bits.

[0120] Example CBSR Limitations

[0121]

[0122]

[0123]

[0124] In the above example CBSR constraints, CBSR constraints (e.g., CBSR_3_1 and CBSR_3_2) and / or CBSR constraints (e.g., CBSR_12_3_1 and CBSR_12_3_2) can represent a third CBSR (e.g., CBSR_3) for CSI C (e.g., for the NCJT hypothesis). For example, a CBSR constraint (e.g., CBSR_3_1) can correspond to a precoder constrained for reporting third PMIs and / or third RIs. As another example, a CBSR constraint (e.g., CBSR_3_2) can correspond to a precoder constrained for reporting fourth PMIs and / or fourth RIs. For example, a CBSR constraint (e.g., CBSR-12_3_1) can correspond to a precoder constrained for calculating the CQI in CSI C. For yet another example, a CBSR constraint (e.g., CBSR-12_3_2) can correspond to a precoder constrained for calculating the CQI in CSI C. For example, CBSR restrictions (e.g., CBSR_31 and / or CBSR_12_31) define P1, while CBSR restrictions (e.g., CBSR_32 and / or CBSR_12_32) define P2.

[0125] For illustrative purposes, another example of CBSR limitation is given below.

[0126] Example CBSR Limitations

[0127]

[0128]

[0129] In the example CBSR constraints above, CBSR constraints (e.g., CBSR_3 and / or CBSR_12_3) can represent a third CBSR for CSI C (e.g., for the NCJT assumption). For example, CBSR_3 The first half of the bits in CBSR_3 can be applied to P1, which relates to the limitations of the precoder used for reporting the third PMI and / or the third RI and / or CQI calculations in CSI C, and the remaining half of the bits in CBSR_3 can be applied to P2, which relates to the limitations of the precoder used for reporting the fourth PMI and / or the fourth RI and / or CQI calculations in CSI C. For example, the first half of the bits in CBSR_3 (e.g., the first 16 bits) can be applied to P1, which relates to the limitations of the precoder used for CQI calculations in CSI C, while the remaining half of the bits in CBSR_3 (e.g., the remaining 16 bits) can be applied to P2, which relates to the limitations of the precoder used for CQI calculations in CSI C.

[0130] Alternative or additional, such as Figure 11 As shown, CSI reporting settings may include fourth and fifth CBSRs and / or fourth and fifth RI limits (e.g., (CBSR_4, CBSR_5) and / or (RI_res4, RI_res5)). Specifically, CSI reporting settings may include fourth and fifth RI limits RI-Res4, RI-Res5, and fourth and fifth CBSRs CBSR_4, CBSR_5. For example, they are all related to CSI-C for multi-TRP transport.

[0131] In some embodiments, the two CBSRs CBSR_4, CBSR_5 and / or the two RI restrictions RI_res4, RI_res5 can be used for the calculation / reporting of the third and fourth PMIs (PMI_3 and PMI_4), and / or the calculation / reporting (or CSI measurement / reporting) of the third and fourth RIs RI_3, RI_4, and / or the CQI calculation in CSI C associated with some CSI-RS resources (e.g., denoted as CSI-RS resource W and CSI-RS resource V). For example, CRI-RS resource W may include at least one of the CSI-RS resources in subset A. As another example, CRI-RS resource V may include at least one of the CSI-RS resources associated with CRI-RS resource W in subset B. Alternatively, CRI-RS resources W and V may include two CSI-RS resources having the same two TCI states (e.g., for the NCJT hypothesis).

[0132] In some embodiments, the fourth CBSR CBSR_4 may correspond to a precoder that is not allowed to report the third PMI in CSI C. In some embodiments, the fifth CBSR CBSR_5 may correspond to a precoder that is not allowed to report the fourth PMI in CSI C. In some embodiments, the fourth CBSR CBSR_4 and / or the fifth CBSR CBSR_5 may correspond to a precoder that is not allowed to be selected for calculating the CQI in CSI C. In some embodiments, the fourth RI restriction RI_res4 may define a fifth layer number, and the precoder associated with the fifth layer number is not allowed to be used for reporting the third PMI and / or the third RI in CSI C. In some embodiments, the fifth RI restriction RI_res5 may define a sixth layer number, and the precoder associated with the sixth layer number is not allowed to be used for reporting the fourth PMI and / or the fourth RI in CSI C. In some embodiments, the fourth RI restriction RI_res4 may define a fifth layer number, and the fifth layer number is not allowed to be used for reporting the third RI in CSI C. In some embodiments, the fifth RI restriction RI_res5 may define a sixth layer number, and the sixth layer number is not allowed to be used for reporting the fourth RI in CSI C.

[0133] In some embodiments of this disclosure, restriction CBSR_4 may define a precoder associated with PMI_3, which is not allowed for CQI calculation, and restriction CBSR_5 may define a precoder associated with PMI_4, which is not allowed for CQI calculation.

[0134] In some embodiments of this disclosure, restriction RI_res4 may define RIs that are not permitted for reporting PMI_3 and / or RI_3, and restriction RI_res5 may define RIs that are not permitted for reporting PMI_4 and / or RI_4. Therefore, reporting of the third PMI may be restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth PMI may be restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, reporting of the third RI may be restricted based on at least one of the fourth CBSR and the fourth RI restriction, and reporting of the fourth RI may be restricted based on at least one of the fifth CBSR and the fifth RI restriction.

[0135] For illustrative purposes only, the following examples are limited.

[0136] Example RI Limitations

[0137] ·ri-Restriction-4(egRI_res4) BIT STRING(SIZE(4))

[0138] ·ri-Restriction-5(egRI_res5) BIT STRING(SIZE(4))

[0139] Example CBSR Limitations

[0140]

[0141]

[0142]

[0143] In the example restrictions, RI_res4 and RI_res5 are two independent restrictions, CBSR_4 and CBSR_5 are two independent restrictions, and CBSR-i2_4 and CBSR-i2_5 are two independent restrictions. Therefore, each of these restrictions can be used to restrict CSI resources separately. For example, RI_res4 can be used to define an RI that is not allowed for CSI reporting in CSI A (e.g., involving TRP1), and RI_res5 can be used to define an RI that is not allowed for CSI reporting in CSI B (e.g., involving TRP2).

[0144] In contrast, in the exemplary third CBSR restriction, a restriction is used to define a pair of CSI resources, and thus a particular pair of CSI resources can be restricted across all possible resource combinations. For example, the RI pair (R1, R2) can be defined as excluded from resources used for CSI reporting, but other resource pairs including R1 or R2 can still be applied.

[0145] In some embodiments of this disclosure, the first CSI includes a first CQI, and the randomly selected precoder used to calculate the first Channel Quality Indicator (CQI) in the first CSI may be limited based on a first CBSR (e.g., CBSR-12_1). Additionally or alternatively, the second CSI includes a second CQI, and the randomly selected precoder used to calculate the second CQI in the second CSI may be limited based on a second CBSR (e.g., CBSR-12_2). Additionally or alternatively, the third CSI includes a third CQI, and the randomly selected precoder used to calculate the third CQI in the third CSI may be limited based on a third CBSR (e.g., CBSR-12_3 or CBSR-12_3_1 and CBSR-12_3_2). Additionally or alternatively, the third CSI includes a third CQI, and the randomly selected precoder used to calculate the third CQI in the third CSI may be limited based on a fourth CBSR (e.g., CBSR-12_4) and a fifth CBSR (e.g., CBSR-12_5).

[0146] It should be noted that although the CSI report settings in the above exemplary embodiments include at least two RI limits and / or at least two CBSR limits, this disclosure is not limited thereto. For example, it may include only a third CSI resource limit (CBSR_3, RI_Res3) or a fourth and fifth resource limit ((CBSR)) for multi-TRP transport.

[0147] In addition, it should be noted that the above references Figure 11 The described CSI report setup scheme can be referenced. Figures 1 to 10 The described CSR reporting schemes can be used in combination, or alternatively, they can be used as separate aspects of the present invention.

[0148] Figure 12 A flowchart of an example method 1200 for communication according to an embodiment of this application is shown. Communication method 1200 may include, for example... Figure 1 The example shown is executed on a network device of TRP 110 or 120.

[0149] like Figure 12 As shown in block 1210, the network device transmits one or more configurations at the network device for at least one of a first Channel State Information (CSI), a second CSI, or a third CSI in the CSI report settings. The one or more configurations in the CSI report settings include at least two rank restrictions or at least two codebook subset restrictions (CBSRs). In block 1210, the network device receives at least one of the first CSI, the second CSI, or the third CSI based on one or more configurations.

[0150] In some embodiments of this application, the at least two rank restrictions include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction, and / or wherein the at least two CBSRs include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. For example, the first RI restriction and / or the first CBSR is associated with a first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR is associated with a second CSI, and / or. Additionally or alternatively, the third RI restriction and / or the third CBSR is associated with the third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with a third CSI.

[0151] In some embodiments of this application, the first CSI includes at least one of the first CRI, the first PMI, and the first RI. Alternatively or additionally, the second CSI includes at least one of the second CRI, the second PMI, and the second RI. Alternatively or additionally, the third CSI includes at least one of or both of the third and fourth CRIs, the third and fourth PMIs, and the third and fourth RIs.

[0152] In some embodiments of this application, the first CSI relates to a single transmit / receive point (TRP) transmission. Additionally or alternatively, the second CSI is associated with the single TRP transmission. Additionally or alternatively, the third CSI is associated with multiple TRP transmissions.

[0153] In some embodiments of this disclosure, reporting of at least one of the first PMI and the first RI is restricted based on at least one of a first CBSR and a first RI restriction. Additionally or alternatively, reporting of at least one of the second PMI and the second RI is restricted based on at least one of a second CBSR and a second RI restriction. Additionally or alternatively, reporting of the third PMI and the fourth PMI is restricted based on at least one of a third CBSR and a third RI restriction; and reporting of the third and fourth RI is restricted based on at least one of a third CBSR and a third RI restriction. Additionally or alternatively, reporting of the third PMI is restricted based on at least one of a fourth CBSR and a fourth RI restriction, and reporting of the fourth PMI is restricted based on at least one of a fifth CBSR and a fifth RI restriction. Additionally or alternatively, reporting of the third RI is restricted based on at least one of a fourth CBSR and a fourth RI restriction, and reporting of the fourth RI is restricted based on at least one of a fifth CBSR and a fifth RI restriction. Additionally or alternatively, the randomly selected precoder used to calculate the first Channel Quality Indicator (CQI) in the first CSI is restricted based on the first CBSR. Alternatively or alternatively, the precoder used for randomly selecting the second CQI in the second CSI is restricted based on the second CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the third CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the fourth and fifth CBSRs.

[0154] In some embodiments of this application, the method further includes transmitting a set of Channel State Information Reference Signals (CSI-RS) resources for channel measurement at a network device, wherein the CSI-RS resource set includes at least two CSI-RS resources.

[0155] In some embodiments of this application, the CSI-RS resource set includes a first subset and a second subset.

[0156] In some embodiments of this application, each CSI-RS resource in the CSI-RS resource set is associated with a Transport Configuration Indication (TCI) state.

[0157] In some embodiments of this application, the first subset includes at least one CSI-RS resource, and each CSI-RS resource is associated with a CSI-RS resource in the second subset.

[0158] In some embodiments of this application, at least one CSI-RS resource in the first subset and an associated CSI-RS resource in the second subset are used for multiple TRP transmissions.

[0159] In some embodiments of this application, each CSI-RS resource in the first subset is associated with two TCI states, and each CSI-RS resource in the second subset is associated with one TCI state.

[0160] In some embodiments of this application, the first subset includes at least one pair of CSI-RS resources associated with the same two TCI states.

[0161] In some embodiments of this application, at least one pair of CSI-RS resources associated with the same two TCI states are used for multiple TRP transmissions.

[0162] According to an embodiment of this disclosure, a terminal device includes: circuitry configured to receive at the terminal device one or more configurations for at least one of a first CSI, a second CSI, or a third CSI in a Channel State Information (CSI) report setting, wherein the one or more configurations in the CSI report setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSR); and to transmit at least one of the first CSI, the second CSI, or the third CSI to a network device based on the one or more configurations.

[0163] In some embodiments of this disclosure, the at least two rank restrictions may include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction, and / or wherein the at least two CBSRs include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. Additionally or alternatively, the first RI restriction and / or the first CBSR is associated with a first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR is associated with a second CSI. Additionally or alternatively, the third RI restriction and / or the third CBSR is associated with the third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with a third CSI.

[0164] In some embodiments of this disclosure, the first CSI includes at least one of a first CRI, a first PMI, and a first RI. Alternatively or additionally, the second CSI includes at least one of a second CRI, a second PMI, and a second RI. Alternatively or additionally, the third CSI includes at least one of or both of a third CRI and a fourth CRI, a third PMI and a fourth PMI, and a third RI and a fourth RI.

[0165] In some embodiments of this disclosure, the first CSI relates to a single transmit / receive point (TRP) transmission. Additionally or alternatively, the second CSI relates to the single TRP transmission. Additionally or alternatively, the third CSI relates to multiple TRP transmissions.

[0166] In some embodiments of this disclosure, the reporting of at least one of the first PMI and the first RI is restricted based on at least one of the first CBSR and the first RI restriction. Additionally or alternatively, the reporting of at least one of the second PMI and the second RI is restricted based on at least one of the second CBSR and the second RI restriction. Additionally or alternatively, the reporting of the third PMI and the fourth PMI is restricted based on at least one of the third CBSR and the third RI restriction; and the reporting of the third and fourth RI is restricted based on at least one of the third CBSR and the third RI restriction. Additionally or alternatively, the reporting of the third PMI is restricted based on at least one of the fourth CBSR and the fourth RI restriction, and the reporting of the fourth PMI is restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, the randomly selected precoder used to calculate the first Channel Quality Indicator (CQI) in the first CSI is restricted based on the first CBSR. Alternatively or alternatively, the precoder used for randomly selecting the second CQI in the second CSI is restricted based on the second CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the third CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the fourth and fifth CBSRs.

[0167] In some embodiments of this disclosure, the circuit may also be configured to receive a set of Channel State Information Reference Signals (CSI-RS) resources for channel measurement at the terminal device, wherein the CSI-RS resource set includes at least two CSI-RS resources for CSI reporting.

[0168] In some embodiments of this disclosure, the CSI-RS resource set includes a first subset and a second subset.

[0169] In some embodiments of this disclosure, each CSI-RS resource in the CSI-RS resource set is associated with a Transport Configuration Indication (TCI) state.

[0170] In some embodiments of this disclosure, the first subset includes at least one CSI-RS resource, each of which is associated with a CSI-RS resource in the second subset.

[0171] In some embodiments of this disclosure, at least one CSI-RS resource in the first subset and an associated CSI-RS resource in the second subset are used for multiple TRP transmissions.

[0172] In some embodiments of this disclosure, each CSI-RS resource in the first subset is associated with two TCI states, and each CSI-RS resource in the second subset is associated with one TCI state.

[0173] In some embodiments of this disclosure, the first subset includes at least one pair of CSI-RS resources associated with the same two TCI states.

[0174] In some embodiments of this disclosure, at least one pair of CSI-RS resources associated with the same two TCI states are used for multiple TRP transmissions.

[0175] According to an embodiment of this disclosure, a network device includes: circuitry configured to: transmit at the network device one or more configurations for at least one of a first CSI, a second CSI, or a third CSI in a Channel State Information (CSI) reporting setting, wherein the one or more configurations in the CSI reporting setting include at least one of at least two rank restrictions or at least two codebook subset restrictions (CBSRs); and receive at the network device at at least one of the first CSI, the second CSI, or the third CSI based on the one or more configurations.

[0176] In some embodiments of this disclosure, the at least two rank restrictions include at least two of a first rank indicator (RI) restriction, a second RI restriction, a third RI restriction, a fourth RI restriction, or a fifth RI restriction. Additionally or alternatively, the at least two CBSRs include at least two of a first CBSR, a second CBSR, a third CBSR, a fourth CBSR, or a fifth CBSR. Additionally or alternatively, the first RI restriction and / or the first CBSR is associated with the first CSI. Additionally or alternatively, the second RI restriction and / or the second CBSR is associated with the second CSI. Additionally or alternatively, the third RI restriction and / or the third CBSR is associated with the third CSI. Additionally or alternatively, the fourth and fifth RI restrictions and / or the fourth and fifth CBSRs are associated with the third CSI.

[0177] In some embodiments of this disclosure, the first CSI includes at least one of a first CRI, a first PMI, and a first RI. Additionally or alternatively, the second CSI includes at least one of a second CRI, a second PMI, and a second RI. Additionally or alternatively, the third CSI includes a third CRI and a fourth CRI, a third PMI and a fourth PMI, and at least one of or both of a third RI and a fourth RI.

[0178] In some embodiments of this disclosure, the first CSI relates to a single transmit / receive point (TRP) transmission. Additionally or alternatively, the second CSI relates to the single TRP transmission. Additionally or alternatively, the third CSI relates to multiple TRP transmissions.

[0179] In some embodiments of this disclosure, the reporting of at least one of the first PMI and the first RI is restricted based on at least one of the first CBSR and the first RI restriction. Additionally or alternatively, the reporting of at least one of the second PMI and the second RI is restricted based on at least one of the second CBSR and the second RI restriction. Additionally or alternatively, the reporting of the third PMI and the fourth PMI is restricted based on at least one of the third CBSR and the third RI restriction; and the reporting of the third and fourth RI is restricted based on at least one of the third CBSR and the third RI restriction. Additionally or alternatively, the reporting of the third PMI is restricted based on at least one of the fourth CBSR and the fourth RI restriction, and the reporting of the fourth PMI is restricted based on at least one of the fifth CBSR and the fifth RI restriction. Additionally or alternatively, the randomly selected precoder used to calculate the first Channel Quality Indicator (CQI) in the first CSI is restricted based on the first CBSR. Alternatively or alternatively, the precoder used for randomly selecting the second CQI in the second CSI is restricted based on the second CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the third CBSR. Alternatively or alternatively, the precoder used for randomly selecting the third CQI in the third CSI is restricted based on the fourth and fifth CBSRs.

[0180] In some embodiments of this disclosure, the circuit may also be configured to transmit a set of Channel State Information Reference Signals (CSI-RS) resources for channel measurement at a network device, wherein the CSI-RS resource set includes at least two CSI-RS resources.

[0181] In some embodiments of this disclosure, the CSI-RS resource set includes a first subset and a second subset.

[0182] In some embodiments of this disclosure, each CSI-RS resource in the CSI-RS resource set is associated with a Transport Configuration Indication (TCI) state.

[0183] In some embodiments of this disclosure, the first subset includes at least one CSI-RS resource, each of which is associated with a CSI-RS resource in the second subset.

[0184] In some embodiments of this disclosure, at least one CSI-RS resource in the first subset and an associated CSI-RS resource in the second subset are used for multiple TRP transmissions.

[0185] In some embodiments of this disclosure, each CSI-RS resource in the first subset is associated with two TCI states, and each CSI-RS resource in the second subset is associated with one TCI state.

[0186] In some embodiments of this disclosure, the first subset includes at least one pair of CSI-RS resources associated with the same two TCI states.

[0187] In some embodiments of this disclosure, at least one pair of CSI-RS resources associated with the same two TCI states are used for multiple TRP transmissions.

[0188] Figure 13 This is a simplified block diagram of device 1300 suitable for implementing some embodiments of the present disclosure. Device 1300 can be considered as another embodiment of a network device including TRP 110, 120 or terminal device 130, such as Figure 1 As shown. Therefore, device 2200 can be implemented in or as a part of a network device including TRP 110, 120 or terminal device 130.

[0189] As shown in the figure, device 1300 includes a processor 1310, a memory 1320 coupled to the processor 1310, suitable transmitters (TX) and receivers (RX) 1340 coupled to the processor 1310, and a communication interface coupled to the TX / RX 1340. The memory 1320 stores at least a portion of a program 1330. The TX / RX 1340 is used for bidirectional communication. The TX / RX 1340 has at least one antenna to facilitate communication, although in practice, the access node mentioned in this application may have several antennas. The communication interface can represent any interface required for communication with other network elements, such as an X2 or Xn interface for bidirectional communication between gNBs or eNBs, an S1 interface for communication between a Mobility Management Entity (MME) / Serving Gateway (S-GW) and a gNB or eNB, an Un interface for communication between a gNB or eNB and a Relay Node (RN), or a Uu interface for communication between a gNB or eNB and a terminal device.

[0190] Assuming program 1330 includes program instructions that, when executed by the associated processor 1310, enable device 1300 to operate according to embodiments of this disclosure, as referenced herein. Figures 1 to 12Any of the embodiments discussed herein. The embodiments herein can be implemented by computer software executable by the processor 1310 of device 1300, or by hardware, or by a combination of software and hardware. Processor 1310 can be configured to implement various embodiments of the invention. Furthermore, a combination of processor 1310 and memory 1320 can form a processing apparatus 1350 suitable for implementing various embodiments of this disclosure.

[0191] Memory 1320 can be of any type suitable for a local technology network and can be implemented using any suitable data storage technology, such as, as non-limiting examples, non-transient computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. Although only one memory 1320 is shown in device 1300, there can be several physically different memory modules in device 1300. As a non-limiting example, processor 1310 can be of any type suitable for a local technology network and can include one or more of a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. Device 1300 can have multiple processors, such as application-specific integrated circuit chips that are time-dependent on a clock that synchronizes with the main processor.

[0192] Components included in the apparatus and / or device of this disclosure can be implemented in various ways, including software, hardware, firmware, or any combination thereof. In some embodiments, one or more units may be implemented using software and / or firmware (e.g., machine-executable instructions stored on a storage medium). In addition to or in lieu of machine-executable instructions, some or all units in the apparatus and / or device may be implemented at least partially by one or more hardware logic components. Illustrative types of hardware logic components that may be used, such as but not limited to, include field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), system-on-a-chip (SoCs), complex programmable logic devices (CPLDs), etc.

[0193] Generally, the various embodiments of this disclosure can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. Some aspects can be implemented in hardware, while others can be implemented in firmware or software, which can be executed by a controller, microprocessor, or other computing device. Although aspects of the embodiments of this disclosure are shown and described as block diagrams, flowcharts, or using some other graphical representation, it will be understood that the blocks, apparatuses, systems, techniques, or methods described herein can be implemented in hardware, software, firmware, dedicated circuitry or logic, general-purpose hardware or controllers or other computing devices, or some combination thereof, as non-limiting examples.

[0194] This disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, that execute on a device targeting a real or virtual processor to perform the processes or methods described above with reference to any of the accompanying drawings. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc., that perform specific tasks or implement specific abstract data types. The functionality of program modules can be combined or separated among program modules as needed in various embodiments. The machine-executable instructions of the program modules can execute within a local or distributed device. In a distributed device, program modules can reside on both local and remote storage media.

[0195] Program code used to perform the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine, partially on a remote machine, or entirely on a remote machine or server.

[0196] The aforementioned program code may be contained on a machine-readable medium, which may be any tangible medium that can contain or store a program used by or in conjunction with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. More specific examples of machine-readable storage media will include electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable optical disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0197] Furthermore, although operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or sequentially, or to perform all shown operations to achieve the desired result. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific embodiment details are included in the foregoing discussion, these details should not be construed as limiting the scope of this disclosure, but rather as descriptions of features specific to particular embodiments. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable subset in multiple embodiments.

[0198] Although this disclosure has been described using language specific to structural features and / or methodological actions, it should be understood that the disclosure as defined in the appended claims is not necessarily limited to the specific features or actions described above. Rather, the specific features and actions described above are disclosed as examples of implementing the claims.

Claims

1. A terminal device, comprising a processor, the processor being configured to cause the terminal device to: Receive configuration including first-rank indicator (RI) limits. in, The first RI restriction indicates a restriction on the RI of one or more resource pairs in the Channel State Information Reference Signal (CSI-RS) resource set, and the first CSI-RS resource indicator (CRI) corresponds to a resource pair in the one or more resource pairs. as well as Based on the configuration, a Channel State Information (CSI) report is sent, wherein the CSI report includes a first RI, a second RI, and the first CRI, and the first RI and the second RI correspond to the resource pairs in the one or more resource pairs in the CSI-RS resource set.

2. The terminal device of claim 1, wherein the first RI restriction comprises an RI pair, wherein the precoding matrix indicator PMI and RI report in the CSI report are not allowed to correspond to the RI pair.

3. The terminal device according to claim 1, wherein... The first RI and the second RI are permitted according to the restrictions imposed by the first RI.

4. The terminal device according to claim 1, wherein... The bit size of the first CRI is ceil(log2(M)), where M is the number of CSI-RS resource pairs included in the CSI-RS resource set.

5. The terminal device according to claim 1, wherein, The CSI report may also include one or two CRIs; If the CSI report also includes a CRI, the bit size of the CRI is ceil(log2(N)); In the case where the CSI report also includes two CRIs, the bit size of one of the two CRIs is ceil(log2(N1)), and the bit size of the other CRI is ceil(log2(N-N1)). Wherein, N1 is the number of CSI-RS resources in the first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in the second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set.

6. The terminal device according to claim 1, wherein, The configuration also includes a second RI limit of 8 bits. The second RI restriction indicates a restriction on the RI applied to the third RI, which is associated with a CSI-RS resource in the CSI-RS resource set.

7. A network device, comprising a processor configured to cause the network device to: Send the configuration including the first-rank indicator (RI) limit. in, The first RI restriction indicates a restriction on the RI of one or more resource pairs in the Channel State Information Reference Signal (CSI-RS) resource set, and the first CSI-RS resource indicator (CRI) corresponds to a resource pair in the one or more resource pairs. as well as Based on the configuration, receive Channel State Information (CSI) reports, wherein the CSI reports include a first RI, a second RI, and the first CRI, and the first RI and the second RI correspond to the resource pairs in the one or more resource pairs in the CSI-RS resource set.

8. The network device of claim 7, wherein the first RI restriction comprises an RI pair, wherein the precoding matrix indicator PMI and RI report in the CSI report are not allowed to correspond to the RI pair.

9. The network device according to claim 7, wherein The first RI and the second RI are permitted according to the restrictions imposed by the first RI.

10. The network device according to claim 7, wherein The bit size of the first CRI is ceil(log2(M)), where M is the number of CSI-RS resource pairs included in the CSI-RS resource set.

11. The network device according to claim 7, wherein, The CSI report may also include one or two CRIs; If the CSI report also includes a CRI, the bit size of the CRI is ceil(log2(N)); In the case where the CSI report also includes two CRIs, the bit size of one of the two CRIs is ceil(log2(N1)), and the bit size of the other CRI is ceil(log2(N-N1)). Wherein, N1 is the number of CSI-RS resources in the first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in the second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set.

12. The network device according to claim 7, wherein, The configuration also includes a second RI limit of 8 bits. The second RI restriction indicates a restriction on the RI applied to the third RI, which is associated with a CSI-RS resource in the CSI-RS resource set.

13. A method executed by a terminal device, comprising: Receive configuration including first-rank indicator (RI) limits. Wherein, the first RI restriction indicates a restriction on the RI of one or more resource pairs in the Channel State Information Reference Signal (CSI-RS) resource set, and the first CSI-RS resource indicator (CRI) corresponds to a resource pair in the one or more resource pairs; and Based on the configuration, a Channel State Information (CSI) report is sent, wherein the CSI report includes a first RI, a second RI, and the first CRI, and the first RI and the second RI correspond to the resource pairs in the one or more resource pairs in the CSI-RS resource set.

14. The method of claim 13, wherein the first RI restriction comprises an RI pair, wherein the precoding matrix indicator PMI and RI report in the CSI report are not allowed to correspond to the RI pair.

15. The method of claim 13, wherein The first RI and the second RI are permitted according to the restrictions imposed by the first RI.

16. The method of claim 13, wherein The bit size of the first CRI is ceil(log2(M)), where M is the number of CSI-RS resource pairs included in the CSI-RS resource set.

17. The method according to claim 13, wherein, The CSI report may also include one or two CRIs; If the CSI report also includes a CRI, the bit size of the CRI is ceil(log2(N)); In the case where the CSI report also includes two CRIs, the bit size of one of the two CRIs is ceil(log2(N1)), and the bit size of the other CRI is ceil(log2(N-N1)). Wherein, N1 is the number of CSI-RS resources in the first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in the second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set.

18. The method according to claim 13, wherein, The configuration also includes a second RI limit of 8 bits. The second RI restriction indicates a restriction on the RI applied to the third RI, which is associated with a CSI-RS resource in the CSI-RS resource set.

19. A method performed by a network device, comprising: Send the configuration including the first-rank indicator (RI) limit. Wherein, the first RI restriction indicates a restriction on the RI of one or more resource pairs in the Channel State Information Reference Signal (CSI-RS) resource set, and the first CSI-RS resource indicator (CRI) corresponds to a resource pair in the one or more resource pairs; and Based on the configuration, receive Channel State Information (CSI) reports, wherein the CSI reports include a first RI, a second RI, and the first CRI, and the first RI and the second RI correspond to the resource pairs in the one or more resource pairs in the CSI-RS resource set.

20. The method of claim 19, wherein, The first RI restriction includes an RI pair, wherein the precoded matrix indicator PMI and RI report in the CSI report are not allowed to correspond to the RI pair.

21. The method of claim 19, wherein The first RI and the second RI are permitted according to the restrictions imposed by the first RI.

22. The method of claim 19, wherein The bit size of the first CRI is ceil(log2(M)), where M is the number of CSI-RS resource pairs included in the CSI-RS resource set.

23. The method according to claim 19, wherein, The CSI report may also include one or two CRIs; If the CSI report also includes a CRI, the bit size of the CRI is ceil(log2(N)); In the case where the CSI report also includes two CRIs, the bit size of one of the two CRIs is ceil(log2(N1)), and the bit size of the other CRI is ceil(log2(N-N1)). Wherein, N1 is the number of CSI-RS resources in the first subset of the CSI-RS resource set, N-N1 is the number of CSI-RS resources in the second subset of the CSI-RS resource set, and N is the number of CSI-RS resources in the CSI-RS resource set.

24. The method according to claim 19, wherein, The configuration also includes a second RI limit of 8 bits. The second RI restriction indicates a restriction on the RI applied to the third RI, which is associated with a CSI-RS resource in the CSI-RS resource set.

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