Terminal device, network device and method

Abstract

An exemplary embodiment of the present disclosure relates to an effective mechanism for processing CSI reporting. In this solution, a terminal device receives, from a network device, at least one configuration for one channel state information (CSI), the configuration indicating at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources; determines a second plurality of CSI-RS resources that are the same as or a subset of the first plurality of CSI-RS resources; and performs at least one of determining a second number of at least one selected first vector based on the second plurality of CSI-RS resources and determining a second number of at least one selected second vector based on the second plurality of CSI-RS resources and the at least one configuration; and transmits the CSI to the network device based on the at least one configuration. In this way, CSI reporting is adaptable to a scenario in which coherent joint transmission based on multiple TRPs is supported.

Description

[Technical Field]

[0001] FIELD Exemplary embodiments of the present disclosure relate generally to the field of communications technologies, and more particularly to methods, apparatus, and media for configuring and transmitting channel state information (CSI) feedback. [Background technology]

[0002] In order to meet the increasing demand for wireless data traffic, several methods have been proposed and implemented, among which multiple input multiple output (MIMO) technology is considered as one of the powerful methods for achieving high data throughput in communication systems. MIMO includes a function that facilitates the use of multiple antenna elements in network devices (e.g., base stations, BSs) for both frequency bands below 6 GHz and above 6 GHz.

[0003] Generally speaking, during communication between a terminal device and a network device, the terminal device needs to report CSI feedback to the network device so that the network device can understand the network situation and create a more appropriate subsequent schedule. Furthermore, it is required to support transmission via two or more transmission reception points (TRPs), also referred to as multi-TRP transmission. In the case of multi-TRP transmission, more parameters need to be reported to the network device compared with single-TRP transmission. Therefore, it is desirable to further discuss how to efficiently transmit CSI feedback with more parameters to the network. Summary of the Invention [Means for solving the problem]

[0004] Overall, embodiments of the present disclosure provide a method, apparatus, and computer storage medium for configuring and transmitting CSI feedback.

[0005] In a first aspect, there is provided a method of communication performed by a terminal device, the method including: receiving, in the terminal device, from a network device at least one configuration for one channel state information (CSI), the configuration indicating at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources; determining a second plurality of CSI-RS resources that is the same as or a subset of the first plurality of CSI-RS resources; determining a second number of at least one selected first vector based on the second plurality of CSI-RS resources; and determining a second number of at least one selected second vector based on the second plurality of CSI-RS resources and the at least one configuration; and transmitting the CSI to the network device based on the at least one configuration.

[0006] In a second aspect, a method of communication performed by a network device is provided, the method including: transmitting at least one configuration of channel state information (CSI), the at least one configuration indicating at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources, to a terminal device in the network device; and receiving the CSI from the terminal device based on the at least one setting.

[0007] In a third aspect, a terminal device is provided, the terminal device comprising: a processing unit; and a memory coupled to the processing unit and storing instructions, the instructions, when executed by the processing unit, causing the terminal device to perform the method of the first aspect.

[0008] In a fourth aspect, there is provided a network device comprising: a processing unit; and a memory coupled to the processing unit and storing instructions, the instructions, when executed by the processing unit, causing the network device to perform the method of the second aspect.

[0009] In a fifth aspect, there is provided a computer-readable medium storing instructions that, when executed on at least one processor, cause the at least one processor to perform a method according to any one of the first and second aspects above.

[0010] Other features of the present disclosure will be readily apparent from the following description. [Brief explanation of the drawings]

[0011] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description of some exemplary embodiments of the present disclosure in the accompanying drawings.

[0012] [Figure 1] 1 is a signaling flow according to some embodiments of the present disclosure.

[0013] [Figure 2A] FIG. 1 illustrates an exemplary communication environment in which exemplary embodiments of the present disclosure may be implemented.

[0014] [Figure 2B] FIG. 1 illustrates another exemplary communication environment in which exemplary embodiments of the present disclosure may be implemented.

[0015] [Figure 2C] 1 is a schematic diagram of space domain, frequency domain, and Doppler / time domain bases.

[0016] [Figure 3] FIG. 1 is a signaling diagram illustrating a process for communication in accordance with some embodiments of the present disclosure.

[0017] [Figure 4] FIG. 1 illustrates an exemplary method according to some embodiments of the present disclosure.

[0018] [Figure 5] FIG. 1 illustrates an exemplary method performed by a terminal device, according to some embodiments of the present disclosure.

[0019] [Figure 6] FIG. 2 illustrates an exemplary method performed by a network device, in accordance with some embodiments of the present disclosure.

[0020] [Figure 7] FIG. 1 is a schematic block diagram of an apparatus suitable for implementing exemplary embodiments of the present disclosure.

[0021] In the drawings, the same or similar reference numbers represent the same or similar elements. DETAILED DESCRIPTION OF THE INVENTION

[0022] The principles of the present disclosure will now be described with reference to some embodiments. It should be understood that these embodiments are provided for illustrative purposes only to aid those skilled in the art in understanding and practicing the present disclosure, and do not imply any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in various ways different from those described below.

[0023] In the following description and claims, unless defined otherwise, 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.

[0024] As used herein, the term "terminal device" refers to any device with wireless or wired communication capabilities.Examples of terminal devices include 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, Ultra-reliable and Low Latency Communication (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, vehicle-mounted devices for V2X communications where X stands for pedestrian, vehicle, or infrastructure / network, devices for Integrated Access and Backhaul (IAB), space-borne vehicles or air-borne vehicles in a non-terrestrial network (NTN) including high altitude platforms (HAPs) including satellites and unmanned aircraft systems (UASs), and augmented reality (AR) devices. These include, but are not limited to, extended reality (XR) devices that include different types of reality, such as XR, mixed reality (MR), and virtual reality (VR), unmanned aerial vehicles (UAVs), which are aircraft without a human pilot and are commonly referred to as drones, devices on high speed trains (HST), image capture devices such as digital cameras, sensor gaming devices, music storage and playback devices, or internet devices that enable wireless or wired internet access and browsing.The "terminal device" may further have "multicast / broadcast" capabilities to support public safety and mission-critical, V2X applications, transparent IPv4 / IPv6 multicast distribution, IPTV, smart TV, wireless services, over-the-air software distribution, group communication, and IoT applications. It may also incorporate one or more Subscriber Identity Modules (SIMs), known as multi-SIMs. The term "terminal device" may be used interchangeably with UE, mobile station, subscriber station, mobile terminal, user terminal, or wireless device.

[0025] The term "network device" means a device capable of providing or hosting a cell or coverage area in which a terminal device can communicate. Examples of network devices include, but are not limited to, a Node B (Node B or NB), an evolved Node B (eNode B or eNB), a next generation Node B (gNB), a transmission reception point (TRP), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), an IAB node, a low-power node such as a femto node or a pico node, and a reconfigurable intelligent surface (RIS).

[0026] The terminal device or network device may have artificial intelligence (AI) or machine learning capabilities, which generally include a model trained from a large amount of data collected for a specific function and can be used to predict some information.

[0027] The terminal device or network device may operate on several frequency ranges, such as FR1 (410 MHz to 7125 MHz), FR2 (24.25 GHz to 71 GHz), frequency bands above 100 GHz, and Terahertz (THz). It can also operate on licensed, unlicensed, and shared spectrum. The terminal device may have two or more connections with the network device under a Multi-Radio Dual Connectivity (MR-DC) application scenario. The terminal device or network device can operate in full duplex, flexible duplex, and cross-division duplex modes.

[0028] Embodiments of the present disclosure may be implemented in test equipment, such as, for example, a signal generator, a signal analyzer, a spectrum analyzer, a network analyzer, a test terminal device, a test network device, a channel emulator, and the like.

[0029] In some embodiments, a 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 secondary 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 regarding the different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In some embodiments, the first information may be transmitted from the first network device to the terminal device, and the second information may be transmitted from the second network device directly or via the first network device to the terminal device. In some embodiments, information regarding the terminal device configuration configured by the second network device may be transmitted from the second network device via the first network device. Information regarding the reconfiguration of the terminal device set by the second network device may be sent to the terminal device directly from the second network device or via the first network device.

[0030] As used herein, the singular forms "a," "an," and "said" include the plural forms unless the context clearly indicates otherwise. The term "comprises" and variations thereof should be understood as open-ended terms meaning "including, but not limited to." The term "based on" should be understood as "based at least in part on." The terms "one embodiment" and "embodiment" should be understood as "at least one embodiment." The term "another embodiment" should be understood as "at least one other embodiment." Terms such as "first," "second," etc. may refer to different or the same object. The following may include other explicit and implicit definitions.

[0031] In some instances, values, procedures, or devices are referred to as "best," "lowest," "highest," "minimum," "maximum," etc. It should be understood that such descriptions are intended to illustrate that choices may be made from among many functional alternatives used, and that such choices are not necessarily better, smaller, higher, or otherwise more preferred than other choices.

[0032] As explained above, CSI feedback is important in wireless communication networks. For example, some discussions for CSI extension are expected in 3GPP (3rd-generation partnership project) Release 18. CSI enhancements for high / medium speeds and for coherent joint transmission (CJT) are specified, and the number of CSI-RS ports per resource is expected to be at least one of {2, 4, 8, 12, 16, 24, 32}.

[0033] In some embodiments, the terminal device may receive at least one configuration for one channel state information (CSI) from the network device, and the at least one configuration may indicate at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources.

[0034] In some embodiments, the terminal device may determine a second plurality of CSI-RS resources, which may be the same as or a subset of the first plurality of CSI-RS resources. In some embodiments, the terminal device may perform at least one of: determining a second number of at least one of the selected first vectors based on the second plurality of CSI-RS resources; and determining a second number of at least one of the selected second vectors based on the second plurality of CSI-RS resources and at least one configuration. In some embodiments, the terminal device may transmit CSI to the network device based on the at least one configuration. In some embodiments, the terminal device may transmit CSI based on at least one of the second number of at least one of the selected first vectors and the second number of at least one of the selected second vectors.

[0035] In some embodiments, at least one first number of the first vectors may include a first set of values, and each value in the first set of values ​​may indicate a first number of the first vectors corresponding to each of the first plurality of CSI-RS resources. In some embodiments, the number of values ​​in the first set may be the same as the number of the first plurality of CSI-RS resources. In some embodiments, at least one second number of the first vectors may include a second set of values, and each value in the second set of values ​​may indicate a second number of the first vectors corresponding to each CSI-RS resource of the second plurality of CSI-RS resources. In some embodiments, the number of values ​​in the second set may be the same as the number of the second plurality of CSI-RS resources. In some embodiments, a value in the second set of values ​​corresponding to a CSI-RS resource may be less than or equal to a value in the first set of values ​​corresponding to the same CSI-RS resource. In some embodiments, each value in the second set of values ​​may be greater than or equal to one or greater than two.

[0036] In some embodiments, the at least one second number of the selected first vectors may include a first value for the first vector and a second value for the first vector, where the first value for the first vector may indicate a second number of the selected first vectors corresponding to a reference CSI-RS resource among the second plurality of CSI-RS resources, and the second value for the first vector may indicate a second number of the selected first vectors corresponding to the remaining CSI-RS resources other than the reference CSI-RS resource among the second plurality of CSI-RS resources.

[0037] In some embodiments, the at least one first number of the first vector may include a third value for the first vector and a fourth value for the first vector, wherein the third value for the first vector may be greater than or equal to the first value for the first vector, and the fourth value for the first vector may be greater than or equal to the second value for the first vector.

[0038] In some embodiments, the terminal device may determine an index of a second vector corresponding to each of the second plurality of CSI-RS resources. In some embodiments, the terminal device may determine a set of selected second vectors from a first plurality of second vectors corresponding to each of the second plurality of CSI-RS resources. In some embodiments, the first plurality of second vectors corresponding to each of the second plurality of CSI-RS resources may be based on a first index of the second vector corresponding to each of the second plurality of CSI-RS resources and a second number of the selected second vectors.

[0039] In some embodiments, the terminal device may determine a first field to indicate a set of selected second vectors corresponding to a reference CSI-RS resource of the second plurality of CSI-RS resources, and in some embodiments, the set of selected second vectors corresponding to a reference CSI-RS resource of the second plurality of CSI-RS resources may include a second vector corresponding to a strongest coefficient indication.

[0040] In some embodiments, the terminal device may determine a second field to indicate a set of selected second vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource from the second plurality of CSI-RS resources. In some embodiments, the set of selected second vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource from the second plurality of CSI-RS resources may include a second vector having an index based on a first index of the second vector corresponding to the reference CSI-RS resource from the second plurality of CSI-RS resources and a second index of the second vector corresponding to the one CSI-RS resource other than the reference CSI-RS resource from the second plurality of CSI-RS resources.

[0041] In some embodiments, the terminal device may determine a set of selected second vectors corresponding to a reference CSI-RS resource from the second plurality of CSI-RS resources. In some embodiments, the terminal device may determine an offset for a CSI-RS resource other than the reference CSI-RS resource from the second plurality of CSI-RS resources. In some embodiments, the terminal device may determine a set of selected second vectors corresponding to a CSI-RS resource other than the reference CSI-RS resource from the second plurality of CSI-RS resources based on the offset and the set of selected second vectors corresponding to the reference CSI-RS resource from the second plurality of CSI-RS resources. In some embodiments, the offset may be relative to at least one of a first index of the set of selected second vectors corresponding to the reference CSI-RS resource from the second plurality of CSI-RS resources, a last index of the set of selected second vectors corresponding to the reference CSI-RS resource from the second plurality of CSI-RS resources, and a first index of the second vector corresponding to the reference CSI-RS resource from the second plurality of CSI-RS resources.

[0042] In some embodiments, the at least one configuration may indicate or include at least one set of parameters. In some embodiments, each set of parameters may indicate or include a first parameter, a second parameter, and a third parameter. In some embodiments, the second number of at least one of the selected second vectors may be determined based on a maximum value of the second parameters of the at least one set of parameters. In some embodiments, the at least one set of parameters may include a first value of the second parameter and a second value of the second parameter. In some embodiments, if the number of the second plurality of CSI-RS resources is 1, the second number of at least one of the selected second vectors may be determined based on the first value of the second parameter. In some embodiments, if the number of the second plurality of CSI-RS resources is 2, 3, or 4, the second number of at least one of the selected second vectors may be determined based on the second value of the second parameter.

[0043] In some embodiments, the terminal device may determine a size of a bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources, hi some embodiments, the terminal device may determine a constraint on the total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources.

[0044] In some embodiments, the size of the bitmap indicating non-zero coefficients and / or the constraint on the total number of non-zero coefficients may be determined based on a maximum value of a third parameter of the at least one set of parameters. In some embodiments, the at least one set of parameters may include a first value of the third parameter and a second value of the third parameter. In some embodiments, if the number of the second plurality of CSI-RS resources is 1, the size of the bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources or the constraint on the total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources may be determined based on the first value of the third parameter. In some embodiments, if the number of the second plurality of CSI-RS resources is 2, 3, or 4, the size of the bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources or the constraint on the total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources may be determined based on the second value of the third parameter.

[0045] In some embodiments, the first number of at least one of the first vectors may include two or more values, and each value of the two or more values ​​may indicate a number or a maximum number of selected first vectors corresponding to each of the first plurality of CSI-RS resources. In some embodiments, the first number of at least one of the first vectors may be one single value, and the single value may indicate a total number or a maximum total number of selected first vectors corresponding to all of the first plurality of CSI-RS resources or all of the second plurality of CSI-RS resources.

[0046] In some embodiments, the network device may transmit at least one configuration for one CSI to the terminal device, where the at least one configuration may indicate at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources. In some embodiments, the network device may receive CSI from the terminal device based on the at least one configuration.

[0047] In some embodiments, it may be desirable to provide enhanced CSI reporting for high / medium speeds for frequency range 1 (fr1) by utilizing time-domain (TD) correlation / Doppler-domain (DD) information to assist downlink precoding. For example, an improved Release 16 / 17 Type II codebook without modification of the spatial domain (SD) and frequency domain (FD) basis. Another example is UE reporting of TD channel properties measured via a CSI reference signal (RS) for tracking.

[0048] In some embodiments, it may be desirable to define CSI acquisition enhancements for CJT for FR1 and up to four TRPs, assuming ideal backhaul and synchronization and the same number of antenna ports across the TRPs, such as Release 16 / 17 Type II codebook refinements for CJT multi-TRP for FDD and its associated CSI reporting, taking into account throughput and overhead tradeoffs.

[0049] 1 shows a signaling diagram illustrating a process 100 between devices in accordance with some example embodiments of the present disclosure. For illustrative purposes only, the process 100 will be described with reference to FIG. 2A or 2B. The process 100 may involve a terminal device 220 and a network device 210 shown in FIG. 2A or 2B.

[0050] In some embodiments, network device 210 may transmit 1010 at least one configuration to terminal device 220. In some embodiments, terminal device 220 may transmit 1020 at least one codebook indicator to network device 210. In some embodiments, the at least one codebook indicator may be determined based on the at least one configuration.

[0051] In some embodiments, a CSI report may be divided into two parts. For example, CSI part 1 (or CSI part 1 or first part) and CSI part 2 (or CSI part 2 or second part). In some embodiments, CSI part 2 may be further divided into three groups. For example, CSI group 0, CSI group 1, and CSI group 2. In some embodiments, a CSI report may include PMI field X1 and PMI field X2. For example, PMI field X1 may be included in CSI group 0. In another example, PMI field X2 may be included in CSI group 1 and CSI group 2. For example, a subset of PMI field X2 may be included in CSI group 1, and the remaining PMI field X2 may be included in CSI group 2.

[0052] Table 1 below shows an example mapping order of the CSI fields for one CSI report, CSI Part 1. [Table 1]

[0053] Table 2 below shows an exemplary RI and CQI. [Table 2]

[0054] Additionally, the values ​​of the rank indicator (RI) field are mapped to the allowed rank indicator values ​​in ascending order, with "0" mapping to the lowest allowed rank indicator value. NZ The values ​​of the indicator field shall be sorted in ascending order according to clauses 5.2.2.2.5 and 5.2.2.2.6 of TS 38.214. NZ where '0' is the allowed value of K NZ =1.

[0055] In some embodiments, a parameter for the number of allowed rank indicator values ​​(e.g., n RI ) may be set by the network device.

[0056] In some embodiments, v may be the value of the tier number or rank indicator field. For example, the tier number or the value of the RI field may be signaled to the network device by the terminal device.

[0057] Table 3 below shows an exemplary RI and CQI. [Table 3]

[0058] The values ​​of the rank indicator (RI) field may be mapped to the allowed rank indicator values ​​in ascending order, where '0' maps to the lowest allowed rank indicator value. NZ The values ​​of the indicator field shall be sorted in ascending order from K to K in accordance with TS 38.214 clause 5.2.2.2.7. NZ where '0' is the allowed value of K NZ =1.

[0059] In some embodiments, the terminal device may receive at least one configuration for CSI feedback from the network device, the at least one configuration including: a first plurality of CSI-RS resources; ● A second plurality of CSI-RS resources; and ● a plurality of antenna ports for one CSI-RS resource of the first or second plurality of CSI-RS resources; ● At least one parameter for antenna port configuration, a configuration for codebook type; ● Setting the report type and At least one parameter for the codebook; ● The number of physical resource blocks (PRBs) in the bandwidth part (BWP), and the number of the plurality of first subbands; the size of one first subband; the number of PRBs in one first subband; a number of second subbands (e.g., denoted as N3); the size of one second subband; the number of PRBs in one second subband; ● The number of multiple time units (e.g., represented as N4) and ● The size of one time unit (e.g., T u or T i ) and ● The number of slots / subslots / symbols in one time unit (e.g., T u or T i ) and A number of first vectors (e.g., denoted as L); ● The number of multiple second vectors (e.g., M υ ) and ● The number of multiple third vectors (e.g., M d ) and a first parameter for the codebook (e.g., denoted as R); ● The second parameter for the codebook (e.g., p v ) and a third parameter for the codebook (e.g., denoted as β); ● The fourth parameter for the codebook (e.g., R d ) and ● The fifth parameter for the codebook (e.g., p v,d ) and ● The sixth parameter for the codebook (e.g., β d ) and and a seventh parameter for the codebook (eg, denoted as M).

[0060] In some embodiments, the terminal device may be configured with the number of PRBs for a bandwidth part (BWP) or may be configured with the size for the BWP. In some embodiments, the number of PRBs for a BWP (e.g., N BWP size ) can be a positive integer. For example, N BWP may be a positive integer, e.g., 24≦N BWP size In some embodiments, the terminal device determines the start position of the BWP (e.g., N BWP start For example, N BWP start can be a non-negative integer, e.g., 0≦N BWP start < 275. In some embodiments, the starting position of the BWP and the number of PRBs for the BWP may be configured in one higher layer parameter.

[0061] In some embodiments, the first subband may correspond to a subband for CQI or a CQI subband or a CSI subband.

[0062] In some embodiments, the size of one first subband or the number of PRBs in one first subband is N PRB SB may be expressed as N PRB SB is a positive integer, for example, 1≦N PRB SB ≦32. For example, N PRB SB may be at least one of {4, 8, 16, 32}. In some embodiments, N PRB SB is N BWP In some embodiments, 24≦N BWP If ≦72, N PRB SB may be 4 or 8. For example, N PRB SB may be set to be 4 or 8 based on higher layer parameters for the subband. In some embodiments, 73≦N BWP If ≦144, N PRB SB may be 8 or 16. For example, N PRB SB may be set to be 8 or 16 based on higher layer parameters for the subband. In some embodiments, 145≦N BWP If ≦275, N PRB SB may be 16 or 32. For example, N PRB SB may be set to be 16 or 32 based on higher layer parameters for the subband.

[0063] In some embodiments, terminal device 220 may be configured to have a first plurality of CSI-RS resources. In some embodiments, at least one configuration for CSI may include or indicate the first plurality of CSI-RS resources. In some embodiments, the first plurality of CSI-RS resources may be N TRP In some embodiments, the number of CSI-RS resources in the first plurality of CSI-RS resources may include N TRP In some embodiments, N TRP may be a positive integer, 1≦N TRP In some embodiments, N TRP may be at least one of {1,2,3,4} or at least one of {2,3,4}.

[0064] In some embodiments, each CSI-RS resource may be represented as t, where t may be a non-negative integer, e.g., 0≦t≦N TRP -1 or t∈{0,1,...N TRP-1}. In some embodiments, a first CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=0. In some embodiments, a second CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=1. In some embodiments, a third CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=2. In some embodiments, a fourth CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=3. In some embodiments, an n-th CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=n-1. In some embodiments, n may be a positive integer. For example, 1≦n≦N TRP or n∈{1,2,...N TRP}.

[0065] In some embodiments, t may be a positive integer, e.g., 1≦t≦N TRP or t∈{1,2,...N TRP} In some embodiments, a first CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=1. In some embodiments, a second CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=1. In some embodiments, a third CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=3. In some embodiments, a fourth CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t=4. In some embodiments, the t-th CSI-RS resource of the first plurality of CSI-RS resources may be represented as a CSI-RS resource with index t.

[0066] In some embodiments, terminal device 220 may indicate, select, determine, or report a second plurality of CSI-RS resources based on the first plurality of CSI-RS resources. In some embodiments, the second plurality of CSI-RS resources may be the same as the first plurality of CSI-RS resources. In some embodiments, the second plurality of CSI-RS resources may be a subset of the first plurality of CSI-RS resources. In some embodiments, the second plurality of CSI-RS resources may include N CSI-RS resources. In some embodiments, the second plurality of CSI-RS resources may include N CSI-RS resources. In some embodiments, the number of CSI-RS resources in the second plurality of CSI-RS resources may be N. In some embodiments, N may be a positive integer, where 1≦N≦N TRP In some embodiments, N may be at least one of {1,2,3,4} or at least one of {2,3,4}. In some embodiments, N may be N TRP It may be the following:

[0067] In some embodiments, the second plurality of CSI-RS resources may be indicated or reported based on the first bitmap. In some embodiments, the number of bits in the first bitmap is N TRP In some embodiments, the bits in the bitmap may be t may be expressed as b t The value of b may be either 0 or 1. In some embodiments, the value of a bit b in a bitmap t may indicate whether the corresponding CSI-RS resource with index t of the first plurality of CSI-RS resources is selected. t may indicate whether a corresponding CSI-RS resource with index t of the first plurality of CSI-RS resources is included or selected in the second plurality of CSI-RS resources. In some embodiments, the first bitmap may be t}, where 1≦t≦N TRP or 0≦t≦N TRP In some embodiments, N TRP If N = 2, the first bitmap may be {b0, b1} or {b1, b2}. TRP If N = 3, the first bitmap may be {b0, b1, b2} or {b1, b2, b3}. TRP = 4, the first bitmap may be {b0, b1, b2, b3} or {b1, b2, b3, b4}. t = 1, then the bit value b t has been selected or is included in the second plurality of CSI-RS resources, corresponding to CSI-RS resource t of the first plurality of CSI-RS resources. In some embodiments, at least one bit in the bitmap may have a value of 1.

[0068] In some embodiments, a reference CSI-RS resource may be present within the first plurality of CSI-RS resources or the second plurality of CSI-RS resources. In some embodiments, the reference CSI-RS resource may be a CSI-RS resource of the second plurality of CSI-RS resources that corresponds to an indication in the bitmap for the strongest coefficient indication, strongest amplitude coefficient, or non-zero coefficient indication. In some embodiments, the reference CSI-RS resource may be the first CSI-RS resource, the last CSI-RS resource, or the most recent CSI-RS resource of the first plurality of CSI-RS resources. In some embodiments, the reference CSI-RS resource may be the first CSI-RS resource, the last CSI-RS resource, or the most recent CSI-RS resource of the second plurality of CSI-RS resources.

[0069] In some embodiments, for each CSI-RS resource in the first plurality of CSI-RS resources, there may be P ports. In some embodiments, P may be a positive integer. In some embodiments, P may be at least one of {2, 4, 8, 12, 16, 24, 32}.

[0070] In some embodiments, P*N TRP The sum or maximum value of may be at least one of {4, 8, 12, 16, 24, 32, 36, 48, 64, 72, 96, 128}.

[0071] In some embodiments, the terminal device may indicate or report at least one capability parameter to the network device. In some embodiments, the different capability parameters may be P*N TRPFor example, the first capability parameter may indicate that the terminal device supports a maximum of 32 for the total number of ports in the first plurality of CSI-RS resources. As another example, the second capability parameter may indicate that the terminal device supports a maximum of 64 for the total number of ports in the first plurality of CSI-RS resources. As another example, the third capability parameter may indicate that the terminal device supports a maximum of 128 for the total number of ports in the first plurality of CSI-RS resources.

[0072] In some embodiments, the terminal device 220 may select a first total number or a first maximum number of first vectors (e.g., at least one first number of first vectors, e.g., L tot or L max For example, the first total number or the first maximum number may be based on an assumption of all CSI-RS resources of the first plurality of CSI-RS resources. In some embodiments, the at least one setting may indicate or include a first total number or a first maximum number of first vectors. In some embodiments, terminal device 220 may determine a second total number or a second maximum number of first vectors (e.g., a second number of at least one selected first vector, e.g., L) based on the second plurality of CSI-RS resources, or based on the first bitmap, or based on the number of CSI-RS resources in the second plurality of CSI-RS resources (e.g., the value of N). tot,r or L max、r (expressed as

[0073] In some embodiments, L tot or L max The value of may be set or determined based on a first set of values, and each value in the first set of values ​​may indicate a first number of first vectors corresponding to each of the first plurality of CSI-RS resources. In some embodiments, the first set of values ​​is TRP In some embodiments, L totor L max The value of L can be a positive integer, for example, 2≦L tot ≦24 or 2≦L max ≦24. In another example, 2≦L tot ≦16 or 2≦L max ≦16. In another example, L tot or L max may be at least one of {2,3,4,6,8,9,12,16}.

[0074] In some embodiments, a value in the first set of values ​​is L t In some embodiments, L t The value of N may be at least one of {1, 2, 3, 4, 5, 6}. TRP If =2, the first set of values ​​may be {L0, L1} or {L1, L2}. TRP If N = 3, the first bitmap may be {L0, L1, L2} or {L1, L2, L3}. TRP = 4, the first bitmap may be {L0, L1, L2, L3} or {L1, L2, L3, L4}. In some embodiments, the values ​​of L0 and / or L1 and / or L2 and / or L3 and / or L4 may be the same or different. In some embodiments,

number

[0075] In some embodiments, terminal device 220 determines a second total number or a second maximum number of first vectors (e.g., at least one second number of first vectors, e.g., L) based on the second plurality of CSI-RS resources, or based on the first bitmap, or based on the number of CSI-RS resources in the second plurality of CSI-RS resources (e.g., the value of N). tot,r or L max,rIn some embodiments, terminal device 220 may determine or report a second set of values ​​based on the second plurality of CSI-RS resources, or based on the first bitmap, or based on the number of CSI-RS resources in the second plurality of CSI-RS resources (e.g., the value of N), where each value in the second set of values ​​may indicate a second number of the first vector corresponding to a respective CSI-RS resource in the second plurality of CSI-RS resources. In some embodiments, L tot,r or L max,r The value of L tot or L max may be less than or equal to the value of L tot,r or L max,r The value of is N or N TRP It may be more than that.

[0076] In some embodiments, the number of values ​​in the second set of values ​​may be the same as the number of CSI-RS resources in the second plurality of CSI-RS resources or the value N or the number of bits having the value 1 in the first bitmap.

[0077] In some embodiments, a value in the second set of values ​​is L ts In some embodiments, ts may be a positive integer, e.g., 1≦ts≦N TRP or ts∈{1,2,...N TRP In some embodiments, L t,s The value of L may be at least one of {1, 2, 3, 4, 5, 6}. ts The value of b is the value of the corresponding bit in the first bitmap. t = 1 t In some embodiments, L ts The value of L ts =L t or 1≦L ts ≦L t may be the value of the bit b ts = 1 or b in the first bitmap t =1.

[0078] In some embodiments, the value of the bit b ts = 1 or b in the first bitmap t = 1, L ts The value of L ts =L t or 1≦L ts ≦L t In some embodiments, the value of the bit b ts = 0 or b in the first bitmap t = 0, L ts The value of L ts =0 is also acceptable.

[0079] In some embodiments, N TRP = 4 and the first bitmap is {1,1,0,1}, there may be three CSI-RS resources in the second plurality of CSI-RS resources. The three CSI-RS resources may be the first CSI-RS resource, the second CSI-RS resource, and the fourth CSI-RS resource of the first plurality of CSI-RS resources. The second set of values ​​may be {L1, L2, L4}, or the second set of values ​​may be {L1, L2, 0, L4}. In some embodiments, the second total number or the second maximum number of first vectors may be L1 + L2 + L4.

[0080] In some embodiments, N TRP = 2, the second set of values ​​is {L 0,S ,L 1,S} or {L 1,S ,L 2,S In some embodiments, N TRP = 3, the first bitmap is 0,S ,L 1,S ,L 2,S} or {L 1,S ,L 2,S ,L 3,S In some embodiments, N TRP= 4, the first bitmap is 0,S ,L 1,S ,L 2,S ,L 3,S} or {L 1,S ,L 2,S ,L 3,S ,L 4,S In some embodiments, L 0,S and / or L 1,S and / or L 2,S and / or L 3,S and / or L 4,S The values ​​of may be the same or different.

number

[0081] In some embodiments, a second number of selected first vectors corresponding to first CSI-RS resources of the second plurality of CSI-RS resources is L 1,S ∈{1,2,...max(L tot -N,L1)} or L 1,S ∈{1,2,...L tot In some embodiments, the second number of selected first vectors corresponding to second CSI-RS resources of the second plurality of CSI-RS resources may be L 2,S ∈{1,2,...max(L tot -L1, L2)} or L 2,S ∈{1,2,...max(L tot -L1,L tot In some embodiments, the second number of selected first vectors corresponding to a third CSI-RS resource of the second plurality of CSI-RS resources is L 3,S ∈{1,2,...max(L tot -L1-L2, L3)} or L 3,S ∈{1,2,...max(L tot -L1-L2,L totIn some embodiments, the second number of selected first vectors corresponding to a fourth CSI-RS resource of the second plurality of CSI-RS resources is L 4,S ∈{1,2,...max(L tot -L1-L2-L3, L4)} or L 4,S ∈{1,2,...max(L tot -L1-L2-L3,L tot -N)}.

[0082] In some embodiments, the minimum value of the second total number of selected first vectors is N or N+1 or min(N+1,N TRP ) In some embodiments, for the reference CSI-RS resource, the minimum value of the second total number of selected first vectors may be 1 or 2. In some embodiments, the minimum value of the number of selected first vectors for each CSI-RS resource of the second plurality of CSI-RS resources may be 1 or 2.

[0083] In some embodiments, the at least one setting may set or indicate a single value for the first total number or the first maximum number of the first vector. In some embodiments, the at least one first number of the first vector may be a single value. For example, the single value may be L tot or L max In some embodiments, a second maximum number or a second total number of selected first vectors (e.g., L tot,r or L max、r ) is expressed as L tot or L max may be less than or equal to the value of

[0084] In some embodiments, the first or maximum number of first vectors corresponding to each CSI-RS resource of the first plurality of CSI-RS resources is a single value L tot or L maxand / or the value of N. In some embodiments, the first number or maximum number of first vectors corresponding to each CSI-RS resource of the first plurality of CSI-RS resources may be determined based on L t =L max / N, L t =ceil(L max / N), or L t =floor(L max / N).

[0085] In some embodiments, the first or maximum number of first vectors corresponding to the reference CSI-RS resource of the first plurality of CSI-RS resources is L t =2*L max / N, L t =2*ceil(L max / N), L t =2*floor(L max / N), L t =L max -(N-1)*ceil(L max / (N+1)) or L t =L max -(N-1)*floor(L max In some embodiments, the first or maximum number of first vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource among the first plurality of CSI-RS resources may be L t =L max / (N+1), L t =ceil(L max / (N+1)), or L t =floor(L max / (N+1)).

[0086] In some embodiments, the second or maximum number of selected first vectors corresponding to each CSI-RS resource of the second plurality of CSI-RS resources is a single value L tot or L maxand / or the value of N. In some embodiments, the second or maximum number of selected first vectors corresponding to each CSI-RS resource of the second plurality of CSI-RS resources may be determined based on L t =L max / N, L t =ceil(L max / N), or L t =floor(L max / N).

[0087] In some embodiments, the second or maximum number of selected first vectors corresponding to the reference CSI-RS resource of the second plurality of CSI-RS resources is L t =2*L max / N, L t =2*ceil(L max / N), L t =2*floor(L max / N), L t =L max -(N-1)*ceil(L max / (N+1)) or L t =L max -(N-1)*floor(L max In some embodiments, the second or maximum number of selected first vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource of the second plurality of CSI-RS resources may be L t =L max / (N+1), L t =ceil(L max / (N+1)), or L t =floor(L max / (N+1)).

[0088] In some embodiments, the at least one first number may include multiple values ​​for the total number or maximum number of first vectors. In some embodiments, there may be multiple values ​​for the total number or maximum number of first vectors. For example, the multiple values ​​may be explicitly set by a network device. In some embodiments, each of the multiple values ​​may indicate or be associated with a value of the number of second plurality of CSI-RS resources or a value of N. In some embodiments, a first value of the multiple values ​​may be a total number or maximum number of first vectors corresponding to a case where the number of second plurality of CSI-RS resources is 1 or N=1. In some embodiments, a second value of the multiple values ​​may be a total number or maximum number of first vectors corresponding to a case where the number of second plurality of CSI-RS resources is 2 or N=2. In some embodiments, a third value of the multiple values ​​may be a total number or maximum number of first vectors corresponding to a case where the number of second plurality of CSI-RS resources is 3 or N=3. In some embodiments, the fourth value of the plurality of values ​​may be the total number or maximum number of first vectors corresponding to when the number of the second plurality of CSI-RS resources is 4 or when N = 4. In some embodiments, the first or last value of the plurality of values ​​may be the total number or maximum number of first vectors corresponding to when the number of the second plurality of CSI-RS resources is N TRP or N=N TRP It may be the total number or maximum number of first vectors corresponding to the case where

[0089] In some embodiments, the at least one setting may set or indicate a first value for the total or maximum number of first vectors and a second value for the total or maximum number of first vectors. In some embodiments, the at least one setting may set or indicate two values ​​for the total or maximum number of first vectors. In some embodiments, the at least one first number of first vectors may include two values ​​for the total or maximum number of first vectors. In some embodiments, the two values ​​may be a first value for the first vector and a second value for the first vector. In some embodiments, if the number of CSI-RS resources in the second plurality of CSI-RS resources is greater than one, the first value for the first vector may indicate the total number of first vectors corresponding to all CSI-RS resources of the second plurality of CSI-RS resources, and if there is only one CSI-RS resource in the second plurality of CSI-RS resources, the second value for the first vector may indicate the total number of first vectors corresponding to the CSI-RS resource of the second plurality of CSI-RS resources.

[0090] In some embodiments, the at least one setting may set or indicate a first value for the first vector and a second value for the first vector. In some embodiments, the at least one setting may set or indicate two values ​​for a first number or a first maximum number of first vectors. In some embodiments, the at least one first number of first vectors may include two values ​​for a first number or a first maximum number of first vectors. In some embodiments, the two values ​​may be a first value for the first vector and a second value for the first vector. In some embodiments, the first value for the first vector may indicate a first number of first vectors corresponding to a reference CSI-RS resource among the first plurality of CSI-RS resources, and the second value for the first vector may indicate a first number of first vectors corresponding to each of the remaining CSI-RS resources other than the reference CSI-RS resource among the first plurality of CSI-RS resources. In some embodiments, the two values ​​may be a first value for the first vector and a second value for the first vector. In some embodiments, the first value for the first vector may indicate a second number of selected first vectors corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources, and the second value for the first vector may indicate a second number of selected first vectors corresponding to each of the remaining CSI-RS resources other than the reference CSI-RS resource among the second plurality of CSI-RS resources.

[0091] In some embodiments, a first value for the first vector may be represented as Lt_1, and a second value for the first vector may be represented as Lt_2. In some embodiments, Lt_1 and / or Lt_2 may be positive integers. For example, Lt_1 and / or Lt_2 may be at least one of {1, 2, 3, 4, 5, 6}. In some embodiments, Lt_1 may be greater than or equal to Lt_2. In some embodiments, Lt_2 may be ceil(Lt_1 / 2) or floor(Lt_1 / 2) or max(ceil(Lt_1 / 2,2)) or max(floor(Lt_1 / 2,2)).

[0092] In some embodiments, the at least one setting may set or indicate a single value for the first vector (e.g., represented as Lt_1). In some embodiments, the at least one setting may set or indicate a single value for the number or maximum number of first vectors. In some embodiments, the at least one first number of first vectors may include a single value for the number or maximum number of first vectors. In some embodiments, the single value for the first vector may indicate the first number or the first maximum number of first vectors corresponding to the reference CSI-RS resource among the first plurality of CSI-RS resources. In some embodiments, for each of the remaining CSI-RS resources other than the reference CSI-RS resource among the first plurality of CSI-RS resources, the value of the first number or the first maximum number of first vectors may be ceil(Lt_1 / 2), floor(Lt_1 / 2), max(ceil(Lt_1 / 2,2)), or max(floor(Lt_1 / 2,2)). In some embodiments, the single value for the first vector may indicate a second or maximum number of selected first vectors corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources, and for each of the remaining CSI-RS resources other than the reference CSI-RS resource among the second plurality of CSI-RS resources, the value of the second or maximum number of selected first vectors may be ceil(Lt_1 / 2), floor(Lt_1 / 2), max(ceil(Lt_1 / 2,2)), or max(floor(Lt_1 / 2,2)).

[0093] In some embodiments, the index of the reference CSI-RS resource among the second plurality of CSI-RS resources or the index of the reference CSI-RS resource among the first plurality of CSI-RS resources may be indicated or reported by the terminal device. In some embodiments, the size of the field for indicating the index of the reference CSI-RS resource is ceil(log2(N TRP)). For example, the size of the field for indicating the index of the reference CSI-RS resource may be 0, 1, or 2. In some embodiments, the field for indicating the index of the reference CSI-RS resource may be in CSI Part 1 or the first part of the CSI. In some embodiments, the size of the field for indicating the index of the reference CSI-RS resource may be ceil(log2(N)). For example, the size of the field for indicating the index of the reference CSI-RS resource may be 0, 1, or 2. In some embodiments, the field for indicating the index of the reference CSI-RS resource may be in CSI Part 2 or the second part of the CSI. This is the case, for example, when the number of CSI-RS resources in the second plurality of CSI-RS resources is greater than 1.

[0094] In some embodiments, the index of the reference CSI-RS resource may be based on a one-bit field and an indication of the strongest coefficient, for example, when the number of CSI-RS resources in the second plurality of CSI-RS resources is greater than one.

[0095] In some embodiments, when the number of CSI-RS resources in the second plurality of CSI-RS resources is 1, the value of the number or maximum number of selected first vectors for one CSI-RS resource of the second plurality of CSI-RS resources may be the maximum value among the numbers or maximum numbers of first vectors for each CSI-RS resource of the first plurality of CSI-RS resources. For example, the value of the number or maximum number of selected first vectors for one CSI-RS resource of the second plurality of CSI-RS resources may be max(L t ) or min(4, max(L t )) may also be used.

[0096] In some embodiments, the terminal device may determine a number of first vectors (e.g., L t,s) may be determined or reported based on the first number of first vectors or the second number of selected first vectors corresponding to the CSI-RS resource. For example, the bit size for the field indicating or reporting the number of first vectors for a CSI-RS resource may be ceil(log2(C(N1*N2,L t,s )) or ceil(log2(nchoosek(N1*N2,L t,s )). In some embodiments, C(a,b) may be nchoosek(a,b).

[0097] In some embodiments, the at least one second number of selected first vectors corresponding to each CSI-RS resource of the second plurality of CSI-RS resources may be indicated or reported to a network device, for example, in CSI Part 1 or the first part of the CSI. In some embodiments, the bit size for the field for indicating the at least one second number of selected first vectors corresponding to each CSI-RS resource of the second plurality of CSI-RS resources may be:

number

[0098] In some embodiments, the terminal device may be configured to have at least one set of parameters, or at least one configuration may include or indicate at least one set of parameters. In some embodiments, each set of parameters may include a second parameter p v , a third parameter β, and a first parameter R. In some embodiments, the number of sets of parameters may be 1, 2, 3, or 4. In some embodiments, the number of sets of parameters may be the same as the number of CSI-RS resources in the first plurality of CSI-RS resources.

[0099] In some embodiments, each set of parameters may correspond to one CSI-RS resource of the first plurality of CSI-RS resources. v and / or the value of β corresponds to a CSI-RS resource among the first plurality of CSI-RS resources or among the second plurality of CSI-RS resources, p v The value may be determined based on the maximum value of the values ​​of β and / or the maximum value of β.

[0100] In some embodiments, the set of parameters with index t includes a second parameter p v,t and / or a third parameter β t In some embodiments, there may be a p for CSI reporting. v and / or the final value of β is

number

[0101] In some embodiments, if there is only one CSI-RS resource in the second plurality of CSI-RS resources, the value of the second parameter and / or the value of the third parameter corresponding to the one selected CSI-RS resource may be applied to the CSI report.

[0102] In some embodiments, at least one setting may indicate or include a first set of parameters and a second set of parameters. In some embodiments, the first set of parameters may include a second parameter p v,1 and / or a third parameter β1. In some embodiments, the second set of parameters includes a second parameter p v,2 and / or a third parameter β2. In some embodiments, if the number of CSI-RS resources in the second plurality of CSI-RS resources is greater than 1, the first set of parameters (e.g., the second parameter p v,1 and / or a third parameter β1) may be applied to the CSI report. In some embodiments, if the number of CSI-RS resources in the second plurality of CSI-RS resources is 1, a second set of parameters (e.g., a second parameter p v,2 and / or a third parameter β2) may be applied to the CSI report. v,2 ≧p v,1 In some embodiments, β2≧β1.

[0103] In some embodiments, for a CSI-RS resource (e.g., denoted as t) of the second plurality of CSI-RS resources, a set of second vectors (e.g., W f,,t ) may be selected or reported and / or determined.

[0104] In some embodiments, for a reference CSI-RS resource of the second plurality of CSI-RS resources, the terminal device determines a first offset (e.g., M initial In some embodiments, M initial can be an integer. For example, M initial ∈{-2M υ +1,-2M υ +2,...,0}. In some embodiments, M υmay be the number of second vectors for a reference CSI-RS resource of the second plurality of CSI-RS resources, or for each CSI-RS resource. In some embodiments, for a reference CSI-RS resource of the second plurality of CSI-RS resources, the terminal device may determine a first plurality of second vectors (e.g., a first window of second vectors). In some embodiments, the first plurality of second vectors or first window may be arranged with an index {M initial ,(M initial +1)mod N3,(M initial +2)mod N3,…,(M initial +2M υ -1)mod N3,(M initial +2M υ ) mod N3}. In some embodiments, the number of second vectors in the first plurality of second vectors or the size of the first window may be M υ In some embodiments, the first plurality of second vectors may be selected or determined from a group or a full set of N3 second vectors, which in some embodiments may be such that N3>T N In some embodiments, T N can be a positive integer, e.g., 1≦T N ≦50. For example, T N =19.

[0105] In some embodiments, for a reference CSI-RS resource of the second plurality of CSI-RS resources, the terminal device may determine and / or report a first set of second vectors selected from a group or the entire set of N3 second vectors. In some embodiments, a first size for the field indicating the first set of second vectors corresponding to the reference CSI-RS resource is:

number

number

[0106] In some embodiments, for a reference CSI-RS resource of the second plurality of CSI-RS resources, the terminal device may determine and / or report a first set of second vectors selected from the first plurality of second vectors or from a first window. In some embodiments, a first size for a field indicating the first set of second vectors corresponding to the reference CSI-RS resource is:

number

[0107] In some embodiments, the remapping / phase rotation may be applied to each second vector corresponding to all CSI-RS resources of the second plurality of CSI-RS resources.

[0108] In some embodiments, for the reference CSI-RS resource, the index is t ref In some embodiments, t ref may be a positive integer, 1≦t ref ≦N TRP In some embodiments, t refmay be a non-negative integer, 0≦t ref ≦N TRP In some embodiments, t ref may be at least one of {0,1,2,3} or {1,2,3,4}. In some embodiments, for each remaining CSI-RS resource (other than the reference CSI-RS resource) among the first plurality of CSI-RS resources or among the second plurality of CSI-RS resources, the index may be denoted as t, where t≠t ref In some embodiments, t may be a positive integer, and 1≦t≦N TRP In some embodiments, t may be a non-negative integer, where 0≦t≦N TRP In some embodiments, t may be at least one of {0, 1, 2, 3} or {1, 2, 3, 4}.

[0109] In some embodiments, for each of the remaining CSI-RS resources t (other than the reference CSI-RS resource), the terminal device may determine a second offset for the second vector (e.g., M initial,t In some embodiments, M initial,t may be an integer. In some embodiments, M initial,t The number of candidate values ​​for may be N3, floor(N3 / A), or ceil(N3 / A). In some embodiments, 0≦M initial,t In some embodiments, B≦M initial,t ≦C. In some embodiments, B may be an integer. For example, B=−ceil(N3 / 2), B=−ceil(N3 / 2)+1, B=−floor(N3 / 2), B=−floor(N3 / 2)+1, or B=0. In some embodiments, C may be an integer. For example, C=ceil(N3 / 2), C=ceil(N3 / 2)−1, C=floor(N3 / 2), C=floor(N3 / 2)−1, or C=2M vIn some embodiments, A is 2, 3, 4, floor(N3 / M v ) or ceil(N3 / M v ) may also be used.

[0110] In some embodiments, M initial,t ∈{0,1,2,...,N3-1}, M initial,t ∈{-ceil(N3 / 2),-ceil(N3 / 2)+1,-ceil(N3 / 2)+2,...,0,1,2,...,ceil(N3 / 2)-2,ceil(N3 / 2)-1}, M initial,t ∈{-floor(N3 / 2),-floor(N3 / 2)+1,-floor(N3 / 2)+2,...,0,1,2,...,floor(N3 / 2)-2,floor(N3 / 2)-1}, M initial,t ∈{-ceil(N3 / 2)+1,-ceil(N3 / 2)+2,...,0,1,2,...,ceil(N3 / 2)-2,ceil(N3 / 2)-1}, M initial,t ∈{-floor(N3 / 2)+1,-floor(N3 / 2)+2,...,0,1,2,...,floor(N3 / 2)-2,floor(N3 / 2)-1}, M initial,t ∈{-floor(N3 / 2),-floor(N3 / 2)+1,-floor(N3 / 2)+2,...,0,1,2,...,ceil(N3 / 2)-2,ceil(N3 / 2)-1}, M initial,t ∈{-ceil(N3 / 2),-ceil(N3 / 2)+1,-ceil(N3 / 2)+2,...,0,1,2,...,floor(N3 / 2)-2,floor(N3 / 2)-1}, M initial,t ∈{0,1,2,...,2M v -1}, M initial,t ∈{0,1,2,...,2M v} or M initial,t ∈{0, A, 2A,..., xA}. In some embodiments, x may be floor(N3 / A) or ceil(N3 / A). In some embodiments, t≠t ref and t ref M may be the index of the reference CSI-RS resource.initial,tref ∈{-2M υ +1,-2M υ +2,...,0}.

[0111] In some embodiments, for each of the remaining CSI-RS resources t (other than the reference CSI-RS resource), the terminal device may determine a second plurality of second vectors (e.g., a second window for the second vectors). In some embodiments, the second plurality of second vectors or the second window for the CSI-RS resource t may be determined based on a second offset for the second vector and / or the second vector having the first index. In some embodiments, the second vector having the first index is determined based on F υ,ref In some embodiments, the second vector having the first index may correspond to the reference CSI-RS resource. In some embodiments, the second vector having the first index may be at least one of: a first second vector of the first set of second vectors corresponding to the reference CSI-RS resource; a last second vector of the first set of second vectors corresponding to the reference CSI-RS resource; one second vector of the first set of second vectors corresponding to the reference CSI-RS resource corresponding to a strongest coefficient indication; a first vector of the first plurality of second vectors or second vectors from the first window corresponding to the reference CSI-RS resource; and a last vector of the first plurality of second vectors or second vectors from the first window corresponding to the reference CSI-RS resource. In some embodiments, F υ,ref can be an integer, for example, F v,ref ∈{0,1,2,...,N3-1}, F v,ref ∈{-2M υ +1,-2M υ +2,...,0,1,2,...,2M υ -2.2M υ -1}, or F v,ref ∈{-2M υ+1,-2M υ +2,...,0,1,2,...,2M υ -2.2M υ}.

[0112] In some embodiments, for a reference CSI-RS resource of the second plurality of CSI-RS resources, the number of vectors in the first plurality of second vectors or the size of the first window is 2M υ In some embodiments, for each of the remaining CSI-RS resources t (other than the reference CSI-RS resource), the number of vectors in the second plurality of second vectors or the size of the second window may be 2M υ , M υ,t , or 2M υ,t In some embodiments, M υ,t can be a positive integer, e.g., 1≦M υ,t ≦2M υ For example, 1≦M υ,t ≦M υ is.

[0113] In some embodiments, for each of the remaining CSI-RS resources t (other than the reference CSI-RS resource), the first or starting second vector of the second plurality of second vectors or within the second window is F s,t =(F v,ref +M offset,t )mod N3 or F s,t =(F v,ref +{0, 1, 2, ..., 2Mv}) mod N3. In some embodiments, the second plurality of second vectors or second windows may be arranged in a matrix of indices {M initial,t ,(M initial,t +1)mod N3,(M initial,t +2)mod N3,…,(M initial,t +2M υ -1)mod N3,(M initial,t +2M υ )mod N3}, {F s,t ,F s,t +1,F s,t +2,...Fs,t +M υ,t}, {F s,t ,F s,t +1,F s,t +2,...F s,t +2M υ,t}, {F s,t ,F s,t +1,F s,t +2,...F s,t +M υ,t -1} or {F s,t ,F s,t +1,F s,t +2,...F s,t +2M υ,t -1}.

[0114] In some embodiments, for each of the remaining CSI-RS resources t (other than the reference CSI-RS resource), a second vector F s,t may be included in the second vector of the second set corresponding to CSI-RS resource t. For example, the field indicating the second vector of the second set corresponding to CSI-RS resource t may be included in the second vector F s,t In some embodiments, the size for the field size indicating the second vector of the second set corresponding to CSI-RS resource t is

number

[0115] In some embodiments, the number of second vectors in the first set of second vectors corresponding to the reference CSI-RS resource and / or the number of second vectors in the first set of second vectors corresponding to CSI-RS resource t may be indicated or reported by the terminal device. In some embodiments, the number of second vectors in the first set of second vectors corresponding to the reference CSI-RS resource and / or the number of second vectors in the first set of second vectors corresponding to CSI-RS resource t may be in CSI Part 1 or CSI Part 2. In some embodiments, the number of second vectors in the first set of second vectors corresponding to the reference CSI-RS resource may not need to be reported. In some embodiments, the field size for the number of second vectors in the first set of second vectors corresponding to the reference CSI-RS resource is

number

number

[0116] In some embodiments, for each remaining CSI-RS resource t (other than the reference CSI-RS resource), the terminal device may determine and / or report a second vector of a second set selected from a group or the entire set of N3 second vectors. In some embodiments, the second size for the field indicating the second vector of the second set corresponding to CSI-RS resource t is

number

[0117] In some embodiments, for each remaining CSI-RS resource t (other than the reference CSI-RS resource), the terminal device may determine and / or report a second set of second vectors selected from a second plurality of second vectors or from a second window. In some embodiments, the second size for the field indicating the second set of second vectors corresponding to CSI-RS resource t is:

number

number

[0118] In some embodiments, the terminal device may receive a reference signal based on the number of antenna ports for the reference signal. In some embodiments, the reference signal may be at least one of a channel state information reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation reference signal (DMRS), a CSI-RS for tracking, and a phase tracking reference signal (PTRS).

[0119] In some embodiments, the value of the first parameter of the antenna port configuration may be represented as N1. For example, N1 may be a positive integer. For example, N1 may be one of {2, 3, 4, 6, 8, 12, 16}. In some embodiments, the value of the second parameter of the antenna port configuration may be represented as N2. For example, N2 may be a positive integer. For example, N2 may be one of {1, 2, 3, 4}. In some embodiments, the first parameter of the antenna port configuration and the second parameter of the antenna port configuration may be configured within one higher layer parameter.

[0120] In some embodiments, the number of antenna ports for each CSI-RS resource of the first or second plurality of CSI-RS resources may be determined based on a first parameter of the antenna port configuration and a second parameter of the antenna port configuration. In some embodiments, the number of antenna ports for the CSI-RS resource may be P=N1·N2·2.

[0121] In some embodiments, there may be a parameter "O1", which may represent a first discrete Fourier transform (DFT) oversampling in a first dimension. For example, "O1" may be one of {1, 2, 4}. As another example, "O1" may be 2 or 4. In some embodiments, there may be a parameter "O2", which may represent a second DFT oversampling in a second dimension. For example, "O2" may be one of {1, 2, 4}. As another example, "O2" may be 2 or 4.

[0122] In some embodiments, one setting of (N1, N2) may correspond to one setting of (O1, O2). In some embodiments, one setting of (O1, O2) may correspond to one setting of (N1, N2). In some embodiments, the settings of (N1, N2) and (O1, O2) may be at least one of the rows and / or columns of Table 4. [Table 4]

[0123] In some embodiments, the vector u m In some embodiments, u m may be a DFT vector. In some embodiments, if N2>1, then

number

number

number

[0124] In some embodiments, when N1=2 and N2=2,

number

number

[0125] In some embodiments, the terminal device may determine or report to the network device the number of layers and at least one codebook indicator based on at least one setting. ri) may be one of {1,2} or {1,2,3,4} or {1,2,3,4,5,6,7,8}. In some embodiments, there may be multiple layers, and each layer may have an index, which may be denoted as r, where r may be a non-negative integer. For example, 1≦r≦v ri For example, r is the set of {1, 2, … v ri} or {1,2} or {1,2,3,4} or {1,2,3,4,5,6,7,8}.

[0126] In some embodiments, the at least one codebook indicator comprises one or more indicators (or fields) for a first plurality of antenna port groups, one or more indicators (or fields) for a second plurality of antenna port groups, one or more indicators (or fields) for a plurality of first vectors, one or more indicators (or fields) for a plurality of second vectors, one or more indicators (or fields) for a first plurality of rotations for a plurality of first vectors, one or more indicators (or fields) for a second plurality of rotations for a plurality of second vectors, one or more indicators (or fields) for a plurality of third vectors, one or more indicators (or fields) for one TRP index (or CSI-RS resource index, CSI-RS port group index, or CSI-RS allocation index). The information may include at least one of: one or more indicators (or fields) for a corresponding plurality of third vectors; an indicator (or field) for the strongest coefficient; one or more indicators (or one or more indices, or one or more fields) for the first antenna port group; one or more indicators (or fields) for a plurality of first amplitude coefficients; one or more indicators (or fields) for a plurality of first phase coefficients; one or more indicators (or fields) for a plurality of second amplitude coefficients; one or more indicators (or fields) for a plurality of second phase coefficients; one or more indicators (or fields) for a plurality of third amplitude coefficients; one or more indicators (or fields) for a plurality of third phase coefficients; a first number of non-zero coefficients; one or more indicators (or one or more bitmaps) for indicating the non-zero coefficients.

[0127] In some embodiments, the one or more indicators (or one or more bitmaps) for indicating non-zero coefficients may indicate an index of a third amplitude coefficient and / or an index of a third phase coefficient, and the value of the third amplitude coefficient corresponding to the index and / or the value of the third phase coefficient corresponding to the index may be non-zero. In some embodiments, the one or more indicators (or one or more bitmaps) for indicating non-zero coefficients may indicate which coefficients in one or more indicators or fields for the plurality of third amplitude coefficients are non-zero or reported. In some embodiments, the one or more indicators (or one or more bitmaps) for indicating non-zero coefficients may indicate which coefficients in one or more indicators or fields for the plurality of third phase coefficients are non-zero or reported.

[0128] In some embodiments, the number of the plurality of first vectors, the second parameter for the codebook, and the third parameter for the codebook may be set or indicated in one higher layer parameter, and in some embodiments, the fifth parameter for the codebook and the sixth parameter for the codebook may be set or indicated in one higher layer parameter.

[0129] In some embodiments, the first parameter for the codebook may be the same as the fourth parameter for the codebook, in some embodiments, the second parameter for the codebook may be the same as the fifth parameter for the codebook, and in some embodiments, the third parameter for the codebook may be the same as the sixth parameter for the codebook.

[0130] In some embodiments, the second parameter for the codebook may be at least one of {½, ¼, ⅛, ⅛6}. In some embodiments, the third parameter for the codebook may be one of {¼, ½, ¾, ⅛, ⅛, ⅛, 1}. In some embodiments, the number of the plurality of first vectors (e.g., denoted as L) may be one of {2, 4, 6} or at least one of {2, 4, 6, 8, 12, 16, 24, 32}. In some embodiments, L may be a positive integer. In some embodiments, L may be one of {2, 4, 6} or one of {2, 4, 6, 8, 12, 16, 24, 32}. In some embodiments, the number of the plurality of first vectors (e.g., L t (represented as) may be one of {2,4,6} or at least one of {2,4,6,8}. In some embodiments, L t may be a positive integer. In some embodiments, L t may be one of {2,4,6}.

[0131] In some embodiments, a third parameter for the codebook may further be based on the number of layers. In some embodiments, one upper layer parameter may indicate L=2 and β=1 / 4, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter may indicate L=2 and β=1 / 2, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter may indicate L=4 and β=1 / 4, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p vIn some embodiments, one upper layer parameter may indicate L=4 and β=½, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter may indicate L=4 and β=3 / 4, and p v In some embodiments, one upper layer parameter may indicate L=4 and β=½, and when the number of layers is 1 or 2, p v = 1 / 2, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter may indicate L=6 and β=½, and p v = 1 / 4. For example, the number of layers is 1 or 2. In some embodiments, one upper layer parameter may indicate L = 6 and β = 3 / 4, and p v = 1 / 4. For example, the number of layers is 1 or 2.

[0132] In some embodiments, one upper layer parameter is L t = 2 and β = 1 / 4, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter is L t = 2 and β = 1 / 2, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter is L t = 4 and β = 1 / 4, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter is L t = 4 and β = 1 / 2, and when the number of layers is 1 or 2, p v = 1 / 4, and the number of layers is 3 or 4, pv In some embodiments, one upper layer parameter is L t = 4 and β = 3 / 4, and p v In some embodiments, one upper layer parameter is L t = 4 and β = 1 / 2, and when the number of layers is 1 or 2, p v = 1 / 2, and the number of layers is 3 or 4, p v In some embodiments, one upper layer parameter is L t = 6 and β = 1 / 2, and p v = 1 / 4. For example, the number of layers is 1 or 2. In some embodiments, one upper layer parameter is L t = 6 and β = 3 / 4, and p v = 1 / 4. For example, the number of layers is 1 or 2.

[0133] In some embodiments, the first parameter for the codebook (e.g., denoted as R) may be a positive integer. For example, R may be a positive integer. For example, R may be one of {1, 2}. In some embodiments, the number of precoding matrices may be determined based on the first parameter for the codebook and the number of the plurality of first subbands. In some embodiments, the first parameter for the codebook may control the total number of precoding matrices indicated by the PMI as a function of the number of configured first subbands or the number of the plurality of first subbands, the size of one first subband, and the number of PRBs for the BWP. In some embodiments, if the second plurality of CSI-RS resources includes only one CSI-RS resource, the value of R may be either 1 or 2. In some embodiments, if the second plurality of CSI-RS resources includes two or more CSI-RS resources, the value of R may be 1.

[0134] In some embodiments, the second subband may correspond to a subband for a precoding matrix indicator (PMI) or a PMI subband.

[0135] In some embodiments, the size of one second subband or the number of PRBs in one second subband is N PMI may be expressed as N PMI is a positive integer, for example, 1≦N PMI ≦32. For example, N PMI may be one of {2, 4, 8, 16, 32}. In some embodiments, N PMI is N PRB SB and R. For example, N PMI =N PRB SB / R.

[0136] In some embodiments, the number N3 of the second subbands or the size or length of one second vector may be a positive integer, for example, 9≦N3≦36. For example, N3=R*N BWP size / N PRB SB In another example,

number

number

number

number

number

number

[0137] In some embodiments, when R=1, one precoding matrix may be indicated for each first subband. In some embodiments, when R=2, for a first subband that is not the first / starting subband or the last / ending subband of the plurality of first subbands in the BWP, two precoding matrices may be indicated for one subband of the plurality of first subbands. For example, the first precoding matrix may be indicated for the first N subbands of one subband of the plurality of first subbands. PRB SB / 2 PRBs, and the second precoding matrix corresponds to the last N PRBs of one subband of the plurality of first subbands. PRB SB In some embodiments, when R=2, for one first subband that is the first / starting subband or the last / ending subband of multiple first subbands in a BWP, (N BWP start mod N PRB SB )≧N PRB SB / 2, one precoding matrix may be indicated corresponding to the first / starting subband among the plurality of first subbands.

[0138] In some embodiments, when R=2, for one first subband that is the first / starting subband or the last / ending subband of multiple first subbands in a BWP, (N BWP start mod N PRB SB ) <N PRB SBFor example, if the first precoding matrix is ​​1 / 2, two precoding matrices may be indicated corresponding to the first / starting subband of the plurality of first subbands. For example, the first precoding matrix may be the first N precoding matrix of the first / starting subband of the plurality of first subbands. PRB SB / 2-(N BWP start mod N PRB SB ) PRBs, and the second precoding matrix may correspond to the last N PRBs of the first / starting subband of the plurality of first subbands. PRB SB / corresponds to 2 PRBs.

[0139] In some embodiments, when R=2, for one first subband that is the first / starting subband or the last / ending subband of multiple first subbands in a BWP, 1+(N BWP start +N BWP size -1)mod N PRB SB ≦N PRB SB / 2, one precoding matrix may be indicated corresponding to the last / ending subband of the plurality of first subbands.

[0140] In some embodiments, when R=2, for one first subband that is the first / starting subband or the last / ending subband of the plurality of first subbands, 1+(N BWP start +N BWP size -1)mod N PRB SB >N PRB SB For example, if the first precoding matrix is ​​N / 2, two precoding matrices may be indicated corresponding to the last / ending subband of the plurality of first subbands. For example, the first precoding matrix may be N / 2 corresponding to the first / ending subband of the plurality of first subbands. PRB SB / 2 PRBs, and the second precoding matrix may correspond to the last 1+(N BWP start +N BWP size -1)mod N PRB SB -N PRB SB / 2 PRBs may be supported.

[0141] In some embodiments, the number M of the plurality of second vectors υ may be a positive integer, for example,

number

[0142] In some embodiments, the plurality of precoding matrices is L+M υ vectors, L t +M υ vectors, N TRP ·(L t +M υ ) vectors or N TRP L t +M υ may be determined from the vectors.

[0143] In some embodiments, nchoosek may be a function that selects k values ​​from n values. In some embodiments, nchoosek(a,b)=a! / (b!*(ab)!). In some embodiments, "!" may be a factorial. In some embodiments, a!=1*2*...*(a-1)*a.

[0144] In some embodiments, one or more indicators (or fields) for the second plurality of antenna port groups may be included in the CSI or the first portion of the CSI.

[0145] In some embodiments, the number of the one or more indicators (or one or more indexes, or one or more fields) for the first antenna port group may be the same as the number of layers. In some embodiments, the number of the one or more indicators (or one or more indexes, or one or more fields) for the first antenna port group may be 1, e.g., common for each layer among the multiple layers. In some embodiments, the one or more indicators (or one or more indexes, or one or more fields) for the first antenna port group may be the same for each layer among the multiple layers.

[0146] In some embodiments, one first vector of the plurality of first vectors comprises:

number

number

number

[0147] In some embodiments, q 1,t and q 2,t may be a rotation of a second plurality of rotations about a plurality of first vectors. For example, q 1,t and q 2,t may be the rotation corresponding to the antenna port group with index t. In some embodiments, q 1,t ∈{0, 1,...O1-1}. In some embodiments, q 2,t ∈{0,1,...O2-1}. In some embodiments, for the second plurality of CSI-RS resources, there may be N fields for rotation indication, each field indicating a rotation corresponding to one CSI-RS resource of the second plurality of CSI-RS resources. In some embodiments, for the second plurality of CSI-RS resources, there may be one field for rotation indication, the field indicating a common rotation corresponding to each CSI-RS resource of the second plurality of CSI-RS resources.

[0148] In some embodiments, the number of one or more indicators (or fields) for the plurality of first amplitude coefficients is K b1 *(T-1) or K b1 *(T1-1) or K b1 *(T s -1) or

number

[0149] In some embodiments, the number of one or more indicators (or fields) for the plurality of first amplitude coefficients is K b1 *(T-1)*M w or K b1 *(T1-1)*M w or K b1 *(T s -1)*M w or

number

[0150] In some embodiments, one or more indicators (or fields) for the plurality of first amplitude coefficients may be included in the PMI, or the first portion of the PMI, or the second portion of the PMI.

[0151] In some embodiments, the number of the one or more indicators (or fields) for the plurality of first phase factors may be based on the number of the first plurality of antenna port groups or the number of the second plurality of antenna port groups. In some embodiments, the number of the one or more indicators (or fields) for the plurality of first phase factors may be based on the number of the first plurality of antenna port groups minus one or the number of the second plurality of antenna port groups minus one.

[0152] In some embodiments, the number of one or more indicators (or fields) for the plurality of first phase coefficients is K b2 *(T-1) or K b2 *(T1-1) or K b2 *(T s -1) or

number

[0153] In some embodiments, the number of one or more indicators (or fields) for the plurality of first phase coefficients is K b2 *(T-1)*M w or K b2 *(T1-1)*M w or K b2 *(T s -1)*M w or

number

[0154] In some embodiments, one first vector is v i may be expressed as

number

[0155] In some embodiments, P t (0) may be the first amplitude coefficient for the antenna port group with index t. In some embodiments, φ t (0) may be the first phase factor for the antenna port group with index t.

[0156] In some embodiments, T may be based on the number T1 of the first plurality of antenna port groups. In some embodiments, T=T1. In some embodiments, T is based on the number T2 of the second plurality of antenna port groups. s In some embodiments, T=Ts.

[0157] In some embodiments,

number

number

[0158] In some embodiments,

number

[0159] In some embodiments, W1=W 01 *W 02 is.

[0160] In some embodiments,

number

[0161] In some embodiments, W 01 The size of is (2*N1*N2)*(2*L t ) may also be used.

[0162] In some embodiments,

number

[0163] In some embodiments,

number

[0164] In some embodiments,

number

[0165] In some embodiments, for W2 corresponding to a layer with index r,

number

[0166] In some embodiments, f may be an index of one second vector, e.g., f=0, 1,...M v It is -1.

[0167] In some embodiments, P r,s (1) may be a second amplitude coefficient corresponding to the layer with index r. In some embodiments, P r,s (1) may not be required. In some embodiments, P r,s (1) may be fixed to be 1.

[0168] In some embodiments, P r,i,s,f (2) may be a third amplitude coefficient corresponding to the layer with index r, corresponding to the first vector with index i, and corresponding to the second vector with index f.

[0169] In some embodiments, φ r,i,s,f (2) may be a third amplitude coefficient corresponding to the layer with index r, corresponding to the first vector with index i, and corresponding to the second vector with index f.

[0170] In some embodiments, s may be 0 and / or 1. For example, s may be for two polarizations. In some embodiments, s may be for a group of different vectors.

[0171] In some embodiments, a second vector (e.g., W f )

number

[0172] In some embodiments, n 3,l (f) ∈{0,1,...,N3-1}.

[0173] In some embodiments,

number

[0174] In some embodiments,

number

[0175] In some embodiments, z may be the index of the second subband, for example z={0, 1,...N3-1}.

[0176] In some embodiments, for a codebook corresponding to a layer with index r and a second subband with index z,

number

[0177] In some embodiments, γ z,r may be a variant on power calculation or power normalization.

[0178] In some embodiments, γ z,r may be based on a plurality of third amplitude coefficients, a plurality of third phase coefficients, and at least one of a plurality of first amplitude coefficients, a plurality of second amplitude coefficients, a plurality of first phase coefficients, and a plurality of second phase coefficients. z,r may be based on at least one of the number of the plurality of first vectors, the number of the plurality of second vectors, and the number of the plurality of third vectors.

[0179] In some embodiments,

number

[0180] In some embodiments, for bits or code points or values ​​of one or more indicators (or one or more bitmaps) to indicate non-zero coefficients having a zero value, the third amplitude coefficient and / or the third phase coefficient corresponding to these bits or code points or values ​​may be set to zero.

[0181] In some embodiments, the number of the plurality of first vectors may be based on the number of CSI-RS resources in the second plurality of CSI-RS resources.

[0182] In some embodiments,

number

[0183] In some embodiments,

number

[0184] In some embodiments, corresponding to a layer with index r,

number

[0185] In some embodiments, P t (0) may be the first amplitude coefficient for the antenna port group with index t. In some embodiments, P t (0) may not be required. In some embodiments, P t (0) may be fixed to be 1.

[0186] In some embodiments, φ t (0) may be the first phase factor for the antenna port group with index t. In some embodiments, φ t (0) may not be required. In some embodiments, φ t (0) may be fixed to be 1.

[0187] In some embodiments, P r,t,s (1) may be a second amplitude coefficient corresponding to the antenna port group with index t and corresponding to the layer with index r. In some embodiments, P r,t,s (1) may not be required. In some embodiments, P r,t,s (1) may be fixed to be 1.

[0188] In some embodiments, P r,t,i,s,f (2)may be a third amplitude coefficient corresponding to a layer with index r, one first vector with index i, and a second vector with index f, for an antenna port group with index t.

[0189] In some embodiments, φ r,t,i,s,f (2) may be a third amplitude coefficient corresponding to a layer with index r, a first vector with index i, and a second vector with index f, for an antenna port group with index t.

[0190] In some embodiments, a second vector (e.g., W f )

number

[0191] In some embodiments, n 3,l (f) ∈{0,1,...,N3-1}.

[0192] In some embodiments,

number

[0193] In some embodiments, for a codebook corresponding to a layer with index r and a second subband with index z,

number

[0194] In some embodiments, the value of one first amplitude coefficient is:

number

[0195] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 0 may correspond to a first amplitude coefficient having a value of 0. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 1 may correspond to a first amplitude coefficient having a value of 1 / (√128).

[0196] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 2 has a value of (1 / 8192) 1 / 4 may correspond to a first amplitude coefficient having

[0197] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 3 may correspond to a first amplitude coefficient having a value of 1 / 8. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 4 may correspond to a first amplitude coefficient having a value of (1 / 2048). 1 / 4 may correspond to a first amplitude coefficient having

[0198] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 5 may correspond to a first amplitude coefficient having a value of 1 / (2√8). In some embodiments, an indicator or field for one first amplitude coefficient having a value of 6 may correspond to a first amplitude coefficient having a value of (1 / 512). 1 / 4 may correspond to a first amplitude coefficient having

[0199] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 7 may correspond to a first amplitude coefficient having a value of 1 / 4. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 8 may correspond to a first amplitude coefficient having a value of (1 / 128). 1 / 4 may correspond to a first amplitude coefficient having

[0200] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 9 may correspond to a first amplitude coefficient having a value of 1 / (√8). In some embodiments, an indicator or field for one first amplitude coefficient having a value of 10 may correspond to a first amplitude coefficient having a value of (√32). 1 / 4 may correspond to a first amplitude coefficient having

[0201] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 11 may correspond to a first amplitude coefficient having a value of 1 / 2. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 12 may correspond to a first amplitude coefficient having a value of 1 / 8. 1 / 4 may correspond to a first amplitude coefficient having

[0202] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 13 may correspond to a first amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for one first amplitude coefficient having a value of 14 may correspond to a first amplitude coefficient having a value of 1 / 2. 1 / 4 In some embodiments, an indicator or field for one first amplitude coefficient having a value of 15 may correspond to a first amplitude coefficient having a value of 1.

[0203] In some embodiments, the value of one first amplitude coefficient is:

number

[0204] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 0 may correspond to a first amplitude coefficient having a value of 0. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 1 may correspond to a first amplitude coefficient having a value of 1 / (√64).

[0205] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 2 may correspond to a first amplitude coefficient having a value of 1 / (√32).

[0206] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 3 may correspond to a first amplitude coefficient having a value of 1 / 4. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 4 may correspond to a first amplitude coefficient having a value of 1 / (√8).

[0207] In some embodiments, an indicator or field for one first amplitude coefficient having a value of 5 may correspond to a first amplitude coefficient having a value of ½. In some embodiments, an indicator or field for one first amplitude coefficient having a value of 6 may correspond to a first amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for one first amplitude coefficient having a value of 7 may correspond to a first amplitude coefficient having a value of 1.

[0208] In some embodiments, the first antenna port group (e.g., index T m ) may have a value of 1. In some embodiments, the value of the first amplitude coefficient corresponding to the first antenna port group (e.g., the antenna port group with index T m The value of the indicator or field for the first amplitude coefficient corresponding to the first antenna port group (e.g., antenna port group with index T m The first amplitude coefficient corresponding to the antenna port group having the first amplitude coefficient or the value of the indicator or field for the first amplitude coefficient may not be reported in the PMI.

[0209] In some embodiments, the value of the first amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may be 0. In some embodiments, the value of the indicator or field for the first amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may be 0. In some embodiments, the first amplitude coefficient or the value of the indicator or field for the first amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may not be reported in the PMI.

[0210] In some embodiments, the value of one second amplitude coefficient is:

number

[0211] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 0 may correspond to a second amplitude coefficient having a value of 0. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 1 may correspond to a second amplitude coefficient having a value of 1 / (√128). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 2 may correspond to a second amplitude coefficient having a value of (1 / 8192). 1 / 4 may correspond to a second amplitude coefficient having

[0212] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 3 may correspond to a second amplitude coefficient having a value of 1 / 8. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 4 may correspond to a second amplitude coefficient having a value of (1 / 2048). 1 / 4 may correspond to a second amplitude coefficient having

[0213] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 5 may correspond to a second amplitude coefficient having a value of 1 / (2√8). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 6 may correspond to a second amplitude coefficient having a value of (1 / 512). 1 / 4 In some embodiments, an indicator or field for one second amplitude factor having a value of 7 may correspond to a second amplitude factor having a value of 1 / 4.

[0214] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 8 has a value of (1 / 128) 1 / 4 In some embodiments, an indicator or field for one second amplitude factor having a value of 9 may correspond to a second amplitude factor having a value of 1 / (√8).

[0215] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 10 has a value of (1 / 32) 1 / 4 may correspond to a second amplitude coefficient having

[0216] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 11 may correspond to a second amplitude coefficient having a value of 1 / 2. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 12 may correspond to a second amplitude coefficient having a value of 1 / 8. 1 / 4 may correspond to a second amplitude coefficient having

[0217] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 13 may correspond to a second amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 14 may correspond to a second amplitude coefficient having a value of 1 / 2. 1 / 4 In some embodiments, an indicator or field for one second amplitude coefficient having a value of 15 may correspond to a second amplitude coefficient having a value of 1.

[0218] In some embodiments, the value of one second amplitude coefficient is:

number

[0219] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 0 may correspond to a second amplitude coefficient having a value of 0. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 1 may correspond to a second amplitude coefficient having a value of 1 / (√64).

[0220] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 2 may correspond to a second amplitude coefficient having a value of 1 / (√32). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 3 may correspond to a second amplitude coefficient having a value of 1 / 4. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 4 may correspond to a second amplitude coefficient having a value of 1 / (√8).

[0221] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 5 may correspond to a second amplitude coefficient having a value of ½. In some embodiments, an indicator or field for one second amplitude coefficient having a value of 6 may correspond to a second amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 7 may correspond to a second amplitude coefficient having a value of 1.

[0222] In some embodiments, the value of one second amplitude coefficient is:

number

[0223] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 0 may correspond to a second amplitude coefficient having a value of 1 / (8√2). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 1 may correspond to a second amplitude coefficient having a value of 1 / 8.

[0224] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 2 may correspond to a second amplitude coefficient having a value of 1 / (4√2). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 3 may correspond to a second amplitude coefficient having a value of 1 / 4.

[0225] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 4 may correspond to a second amplitude coefficient having a value of 1 / (2√2). In some embodiments, an indicator or field for one second amplitude coefficient having a value of 5 may correspond to a second amplitude coefficient having a value of 1 / 2.

[0226] In some embodiments, an indicator or field for a second amplitude coefficient having a value of 6 may correspond to a second amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for a second amplitude coefficient having a value of 7 may correspond to a second amplitude coefficient having a value of 1. In some embodiments, a second amplitude coefficient may be a difference value corresponding to a first amplitude coefficient.

[0227] In some embodiments, the value of one second amplitude coefficient may be one of {1 / (√2), 1}. In some embodiments, the bit size for one second amplitude coefficient may be 1 bit. In some embodiments, the value of an indicator or field for one second amplitude coefficient may be one of {0, 1}. In some embodiments, an indicator or field for one second amplitude coefficient having a value 0 may correspond to a second amplitude coefficient having a value 1 / (√2).

[0228] In some embodiments, an indicator or field for one second amplitude coefficient having a value of 1 may correspond to a second amplitude coefficient having a value of 1. In some embodiments, a second amplitude coefficient may be a difference value corresponding to a first amplitude coefficient.

[0229] In some embodiments, the value of the second amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may be 0. In some embodiments, the value of the indicator or field for the second amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may be 0. In some embodiments, the second amplitude coefficient or the value of the indicator or field for the second amplitude coefficient corresponding to an antenna port group not included in the second plurality of antenna port groups may not be reported in the PMI.

[0230] In some embodiments, the value of one third amplitude coefficient is:

number

[0231] In some embodiments, an indicator or field for one third amplitude coefficient having a value of 0 may correspond to a third amplitude coefficient having a value of 1 / (8√2). In some embodiments, an indicator or field for one third amplitude coefficient having a value of 1 may correspond to a third amplitude coefficient having a value of 1 / 8.

[0232] In some embodiments, an indicator or field for one third amplitude coefficient having a value of 2 may correspond to a third amplitude coefficient having a value of 1 / (4√2). In some embodiments, an indicator or field for one third amplitude coefficient having a value of 3 may correspond to a third amplitude coefficient having a value of 1 / 4. In some embodiments, an indicator or field for one third amplitude coefficient having a value of 4 may correspond to a third amplitude coefficient having a value of 1 / (2√2).

[0233] In some embodiments, an indicator or field for a third amplitude coefficient having a value of 5 may correspond to a third amplitude coefficient having a value of ½. In some embodiments, an indicator or field for a third amplitude coefficient having a value of 6 may correspond to a third amplitude coefficient having a value of 1 / (√2). In some embodiments, an indicator or field for a third amplitude coefficient having a value of 7 may correspond to a third amplitude coefficient having a value of 1. In some embodiments, a third amplitude coefficient may be a difference value corresponding to a first amplitude coefficient and / or a second amplitude coefficient.

[0234] In some embodiments, the value of one third amplitude coefficient may be one of {1 / (√2), 1}. In some embodiments, the bit size for one third amplitude coefficient may be 1 bit. In some embodiments, the value of an indicator or field for one third amplitude coefficient may be one of {0, 1}. In some embodiments, an indicator or field for one third amplitude coefficient having a value 0 may correspond to a third amplitude coefficient having a value 1 / (√2). In some embodiments, an indicator or field for one third amplitude coefficient having a value 1 may correspond to a third amplitude coefficient having a value 1.

[0235] In some embodiments, for bits or code points or values ​​of one or more indicators (or one or more bitmaps) to indicate non-zero coefficients having a 0 value, the values ​​of the first amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0, and / or the values ​​of the indicators or fields for the first amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0. In some embodiments, the values ​​of the first amplitude coefficients corresponding to these bits or code points or values, and / or the values ​​of the indicators or fields for the first amplitude coefficients corresponding to these bits or code points or values ​​may not be reported in the PMI.

[0236] In some embodiments, for bits or code points or values ​​of one or more indicators (or one or more bitmaps) to indicate non-zero coefficients having a zero value, the values ​​of the second amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0, and / or the values ​​of the indicators or fields for the second amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0. In some embodiments, the values ​​of the second amplitude coefficients corresponding to these bits or code points or values, and / or the values ​​of the indicators or fields for the second amplitude coefficients corresponding to these bits or code points or values ​​may not be reported in the PMI.

[0237] In some embodiments, for bits or code points or values ​​of one or more indicators (or one or more bitmaps) to indicate non-zero coefficients having a 0 value, the values ​​of the third amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0, and / or the values ​​of the indicators or fields for the third amplitude coefficients corresponding to these bits or code points or values ​​may be set to be 0. In some embodiments, the values ​​of the third amplitude coefficients corresponding to these bits or code points or values, and / or the values ​​of the indicators or fields for the third amplitude coefficients corresponding to these bits or code points or values ​​may not be reported in the PMI.

[0238] In some embodiments, for bits or code points or values ​​of one or more indicators (or one or more bitmaps) to indicate non-zero coefficients having a zero value, the value of at least one of the first phase coefficient, the second phase coefficient, and the third phase coefficient corresponding to these bits or code points or values ​​may be set to be 0, and / or the value of an indicator or field for at least one of the first phase coefficient, the second phase coefficient, and the third phase coefficient corresponding to these bits or code points or values ​​may be set to be 0. In some embodiments, the value of at least one of the first phase coefficient, the second phase coefficient, and the third phase coefficient corresponding to these bits or code points or values, and / or the value of an indicator or field for at least one of the first phase coefficient, the second phase coefficient, and the third phase coefficient corresponding to these bits or code points or values ​​may not be reported in the PMI.

[0239] In some embodiments, the value of one first phase factor is:

number

number

number

[0240] In some embodiments, the number of one or more indicators (or fields) for the plurality of first amplitude coefficients is K b1 *(T-1) or K b1 *(T1-1) or K b1 *(T s -1) or

number

[0241] In some embodiments, the number of one or more indicators (or fields) for the plurality of first amplitude coefficients is K b1 *(T-1)*M w or K b1 *(T1-1)*M w or K b1 *(T s -1)*M w or

number

[0242] In some embodiments, one or more indicators (or fields) for the plurality of first amplitude coefficients may be included in the PMI, or the first portion of the PMI, or the second portion of the PMI.

[0243] In some embodiments, the number of the one or more indicators (or fields) for the plurality of first phase factors may be based on the number of the first plurality of antenna port groups or the number of the second plurality of antenna port groups. In some embodiments, the number of the one or more indicators (or fields) for the plurality of first phase factors may be based on the number of the first plurality of antenna port groups minus one or the number of the second plurality of antenna port groups minus one.

[0244] In some embodiments, the number of one or more indicators (or fields) for the plurality of first phase coefficients is K b2 *(T-1) or K b2 *(T1-1) or K b2 *(T s -1) or

number

[0245] In some embodiments, the number of one or more indicators (or fields) for the plurality of first phase coefficients is K b2 *(T-1)*M w or K b2 *(T1-1)*M w or K b2 *(T s -1)*Mw or

number

[0246] In some embodiments, the first vector may be after Schmidt orthogonalization based on the first vector in the present disclosure.

[0247] In some embodiments, the value of N3 corresponding to the first set of codebook indicators may be less than or equal to the value of N3 corresponding to the second set of codebook indicators. In some embodiments, the value of the first parameter and / or the value of the fourth parameter corresponding to the first set of codebook indicators may be less than or equal to the value of the first parameter and / or the value of the fourth parameter corresponding to the second set of codebook indicators. In some embodiments, the first value of the number of the second plurality of antenna port groups may be 1. In some embodiments, the second value of the number of the second plurality of antenna port groups may be 2, 3, or 4. In some embodiments, the first set of codebook indicators may be a single-TRP hypothesis. In some embodiments, the second set of codebook indicators may be a multi-TRP hypothesis.

[0248] In some embodiments, the bit size of one or more indicators or fields for the plurality of third amplitude coefficients and / or the bit size of one or more indicators or fields for the plurality of third phase coefficients corresponding to the first set of codebook indicators may be smaller than the bit size of one or more indicators or fields for the plurality of third amplitude coefficients and / or the bit size of one or more indicators or fields for the plurality of third phase coefficients corresponding to the second set of codebook indicators.

[0249] In some embodiments, the bit size of the one or more indicators for the plurality of first vectors and / or the bit size of the one or more indicators for the plurality of first vectors is ceil(log2(nchoosek(N1N2,L))) or ceil(log2(nchoosek(N1N2,L t *T))) or ceil(log2(nchoosek(N1N2,L t *T1))) or ceil(log2(nchoosek(N1N2,L t *T s ))) may be based on

[0250] For ease of explanation, some terms used in the following description are listed below: ● Omission priority: Priority for controlling dropping or omission. Specifically, different partitions / information groups in the CSI feedback may be configured to have different omission priorities. When transmission resources are insufficient, partitions / information groups (including related parameters) with lower omission priorities are dropped or omitted first. ● CSI-RS allocation: refers to a CSI-RS unit, a CSI-RS resource, a group of CSI-RS resources, or a group of CSI-RS ports. In some embodiments, one CSI-RS allocation may correspond to a TRP. ● First CSI-RS allocation: refers to a CSI-RS allocation corresponding to a particular CSI-RS allocation, for example, a primary TRP, a TRP with an index value of 0, a TRP with the strongest amplitude coefficient, or a TRP with the highest power. ● First TRP: Refers to a specific TRP, for example, a primary TRP, a TRP with an index value of 0, a TRP with the strongest amplitude coefficient, or a TRP with the maximum power. ● First group of CSI-RS ports: refers to a specific group of CSI-RS ports, for example, a group of CSI-RS ports corresponding to a first CSI-RS allocation, a primary TRP, a TRP with an index value of 0, a TRP with the strongest amplitude coefficient, or a TRP with the highest power.

[0251] In the context of this application, the terms "TCI state", "set of QCL parameters", "QCL parameters", "QCL assumption" and "QCL configuration" may be used interchangeably. The terms "TCI field", "TCI state field" and "transmission configuration indication" may be used interchangeably.

[0252] The terms "precoding matrix," "precoding," "beam," "beamforming," "vector," "first vector," "first basis," "first basis vector," and "precoder" may be used interchangeably. The terms "vector," "base," and "basis" may be used interchangeably.

[0253] In the context of this application, the terms "single TRP", "single TCI state", "single TCI", "S-TCI", "single CORESET", "single control resource set pool", "S-TRP" and "S-TCI state" may be used interchangeably.

[0254] The terms "multiple TRPs", "multiple TCI states", "multiple CORESETs", "multiple control resource set pools", "multi-TRPs", "multi-TCI states", "multi-TCIs", "multi-CORESETs" and "multiple control resource set pools", "MTRPs" and "M-TCIs", "M-TPRs" may be used interchangeably.

[0255] In the context of this application, the terms "pool", "set", "subset", "group", "unit" and "subgroup" may be used interchangeably.

[0256] In the context of this application, the terms "index", "indicator", "indication", "field", "bit field" and "bitmap" may be used interchangeably. The terms "physical resource block", "resource block", "PRB" and "RB" may be used interchangeably. The terms "bit size", "size of bit", "number of bits", "size of field" and "field size" may be used interchangeably.

[0257] In the context of this application, the terms "first vector," "first beam," "first basis," "spatial domain / SD basis vector," "spatial domain / SD vector," "spatial domain / SD basis," "spatial domain / SD basis," and "first basis" may be used interchangeably.

[0258] In the context of this application, the terms "first vector," "first beam," "beam," "first basis," "first basis vector," "spatial domain / SD basis vector," "spatial domain / SD basis vector corresponding to a TRP index," "spatial domain / SD vector corresponding to a TRP index," "spatial domain / SD basis corresponding to a TRP index," "first basis corresponding to a TRP index," "Doppler domain / DD basis vector," "Doppler domain / DD vector," "Doppler domain / DD basis," and "first basis" may be used interchangeably.

[0259] In the context of the present disclosure, the terms "second vector," "second basis," "frequency domain / FD basis vector," "frequency domain / FD vector," "frequency domain / FD basis," "frequency domain / FD basis," "second basis," "second vector corresponding to a TRP index," "second basis corresponding to a TRP index," "frequency domain / FD basis vector corresponding to a TRP index," "frequency domain / FD vector corresponding to a TRP index," "frequency domain / FD basis corresponding to a TRP index," "frequency domain / FD basis corresponding to a TRP index," "Doppler domain / DD basis vector," "Doppler domain / DD vector," "Doppler domain / DD basis," and "second basis corresponding to a TRP index" may be used interchangeably.

[0260] In the context of this disclosure, the terms "third vector," "third basis," "Doppler domain / DD basis vector," "Doppler domain / DD vector," "Doppler domain / DD basis," "Doppler domain / DD base," "third basis," "third vector corresponding to a TRP index," "third basis corresponding to a TRP index," "Doppler domain / DD basis vector corresponding to a TRP index," "Doppler domain / DD vector corresponding to a TRP index," "Doppler domain / DD basis corresponding to a TRP index," "Doppler domain / DD base corresponding to a TRP index," and "third basis corresponding to a TRP index" may be used interchangeably. In this application, the terms "Doppler domain," "time domain," "TD," and "DD" may be used interchangeably. In the context of this application, the terms "TRP," "TRP group," "CSI-RS resource," and "group of CSI-RS ports" may be used interchangeably.

[0261] In the context of this application, an embodiment described for a first vector may also be applied to a second vector and / or a third vector and / or an FD basis vector or an SD basis vector or a DD basis vector. In the context of this application, an embodiment described for a second vector may also be applied to a first vector and / or a third vector and / or an FD basis vector or an SD basis vector or a DD basis vector.

[0262] In the context of this application, the terms "TRP index", "TRP group index", "CSI-RS resource index" and "group of CSI-RS port index" may be used interchangeably.

[0263] In the context of this application, the terms "element of an instruction field", "parameter", and "instruction" may be used interchangeably.

[0264] The principles and embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0265] FIG. 2A illustrates an exemplary communication environment 200 in which exemplary embodiments of the present disclosure may be implemented.

[0266] Communication environment 200 includes network device 210-1 and terminal device 220, and network device 210-1 is capable of communicating with terminal device 220 via a physical communication channel or link. Additionally, network device 210-1 may provide more than one serving area.

[0267] Optionally, in some embodiments, communications environment 200 further includes another network device 210-2 that may communicate with terminal device 220. For purposes of discussion, network devices 210-1 and 210-2 will be referred to collectively or individually as network device 210, respectively.

[0268] In the exemplary communication environment 200, the link from terminal device 220 to network device 210-1 is referred to as the uplink, and the link from network device 210-1 to terminal device 220 is referred to as the downlink. Furthermore, communication environment 200 supports MIMO so that network device 210-1 and terminal device 220 can communicate via different beams to enable directional communication. In the downlink, network device 210-1 is a transmitting (TX) device (or transmitter) and terminal device 220 is a receiving (RX) device (or receiver), and network device 210-1 may transmit downlink transmissions to terminal device 220 via one or more beams. As shown in FIG. 2A, network device 210-1 transmits downlink transmissions to terminal device 220 via beams 240-1 through 240-3.

[0269] Accordingly, in the uplink, network device 210-1 is the RX device (or receiver), terminal device 220 is the TX device (or transmitter), and terminal device 220 may send uplink transmissions to network device 210-1 via one or more beams. As shown in FIG. 2A, terminal device 220 sends uplink transmissions to network device 210-1 via beams 230-1 through 230-3. For purposes of explanation, beams 230-1 through 230-3 or beams 240-1 through 240-3 will be referred to collectively or individually as beams 230 or beams 240, respectively.

[0270] Additionally, terminal device 220 may be configured to have two or more panels. As shown in FIG. 2A, terminal device 220 is configured to have panels 250-1 and 250-2. Hereinafter, panels 250-1 and 250-2 may be referred to as first panel 250-1 and second panel 250-2, respectively. In some embodiments, panels 250-1 and 250-2 may each correspond to a different set of capability parameters.

[0271] In some embodiments, one panel may be associated with one or more CSI-RS assignments / beams. Thus, terminal device 220 may use a particular panel to transmit a directional signal to network device 210-1 via a particular beam associated with a CSI-RS assignment.

[0272] In some embodiments, different panels correspond to different panel types / capability value sets. For example, panels 250-1 and 250-2 may correspond to different numbers of SRS ports, frequency resources (frequency bands, CCs, beams, etc.), and any other suitable capability parameters (e.g., capability value sets).

[0273] Further, in the example of FIG. 2A, network device 210-1 may send a configuration for CSI feedback to terminal device 220, and terminal device 220 may send CSI feedback to network device 210-1.

[0274] In some embodiments, the CSI feedback is transmitted on the PUSCH. Alternatively, in some other embodiments, the CSI feedback is transmitted on the PUCCH.

[0275] Furthermore, the terminal device 220 may communicate with the network device 210 via one or more TRPs. Figure 2B illustrates an exemplary scenario of a communication network 280. In the example of Figure 2B, a first TRP 285-1 and a second TRP 285-2 may be used for communication between the terminal device 220 and the network device 210.

[0276] In some embodiments, network device 210 may communicate with terminal device 220 via a first TRP and / or a second TRP and / or a third TRP and / or a fourth TRP. For example, the first TRP and / or the second TRP and / or the third TRP and / or the fourth TRP may be included in the same serving cell or different serving cells provided by network device 210. While some embodiments of the present disclosure have been described with reference to the first TRP and / or the second TRP and / or the third TRP and / or the fourth TRP within the same serving cell provided by network device 210, these embodiments are for illustrative purposes only and are intended to assist those skilled in the art in understanding and practicing the present disclosure, and do not imply any limitation on the scope of the present disclosure. It should be understood that the subject matter of the present disclosure described herein may be implemented in various manners different from those described below.

[0277] 2C is a schematic diagram 290 of spatial, frequency, and Doppler / time domain bases. As shown in FIG. 2C, there are multiple codebooks or precoding matrices including spatial, frequency, and Doppler / time domain vectors. In some embodiments, as shown in FIG. 2C, at each point in time or time unit in the Doppler / time domain, e.g., t=0, 1, 2, 3, ..., N4-1, there is a corresponding W(t). The parameter W(t) is given by the following equation (1):

number

[0278] In some embodiments, an example of a predefined codebook structure is enabled by SD / FD basis selection and relative co-phase / amplitude per TRP (port group or resource). An example formula (N=number of TRPs or TRP groups) is as follows:

number

number

[0279] In some embodiments, another example of a predefined codebook structure is enabled via SD basis selection per TRP (port group or resource) and joint (across N TRPs) FD basis selection. An example formula (where N=number of TRPs or TRP groups) is:

number

[0280] 2A and 2B are provided for illustrative purposes only and do not imply any limitations on the present disclosure. Communication environment 200 and communication network 280 may include any suitable number of network devices and / or terminal devices and / or TRPs suitable for implementing embodiments of the present disclosure.

[0281] In some embodiments, terminal device 220 and network device 210 may communicate with each other over an air interface (e.g., a Uu interface) via channels such as wireless communication channels. The wireless communication channels may include a PUCCH, a PUSCH, a physical random-access channel (PRACH), a physical downlink control channel (PDCCH), a PDSCH, and a physical broadcast channel (PBCH). Of course, any other suitable channels are also possible.

[0282] Communications in communication environment 200 and communication network 280 may conform to any suitable standard, including, but not limited to, Global System for Mobile Communications (GSM), Long Term Evolution (LTE), LTE-Evolution, LTE-Advanced (LTE-A), New Radio (NR), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), GSM EDGE Radio Access Network (GERAN), Machine Type Communication (MTC), etc. Embodiments of the present disclosure may be performed in accordance with any generation of communication protocols now known or 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, fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or sixth generation (6G) networks.

[0283] Although features / operations are described separately in particular exemplary embodiments, it should be understood that, unless expressly indicated to the contrary, these features / operations described in different exemplary embodiments may be used in any suitable combination.

[0284] Additionally, in the following description, several interactions (e.g., exchange of settings, etc.) are performed between terminal device 220 and network device 210. It should be understood that the interactions may be realized in one signaling / message or multiple signaling / messages, including system information, radio resource control (RRC) messages, downlink control information (DCI) messages, uplink control information (UCI) messages, media access control (MAC) control elements (CEs), etc. The present disclosure is not limited in this respect.

[0285] The principles and embodiments of the present disclosure will now be described in detail with reference to Figure 3, which shows a signaling chart illustrating a communication process 300 according to some embodiments of the present disclosure. For illustrative purposes, the process 300 will be described with reference to Figures 2A and 2B. The process 300 may involve a terminal device 220 and a network device 210.

[0286] In some embodiments, there may be multiple TRPs, e.g., N TRPs / TRP groups greater than 2. Also, each TRP / TRP group may be indexed by t (t∈{0, 1, ... N-1} or t∈{1, 2, ... N}).

[0287] In some embodiments, each TRP / TRP group corresponds to a CSI-RS allocation, eg, a CSI-RS unit, a CSI-RS resource, a group of CSI-RS resources, or a group of CSI-RS ports.

[0288] In some embodiments, the value of the first parameter of the antenna port configuration may be represented as N1. For example, N1 may be a positive integer. For example, N1 may be at least one of {2, 3, 4, 6, 8, 12, 16}. In some embodiments, the value of the second parameter of the antenna port configuration may be represented as N2. For example, N2 may be a positive integer. For example, N2 may be at least one of {1, 2, 3, 4}. In some embodiments, the first parameter of the antenna port configuration and the second parameter of the antenna port configuration may be configured within one higher layer parameter.

[0289] In some embodiments, network device 210 may configure terminal device 220 to report CSI feedback. As shown in FIG. 3, terminal device 220 receives 310 a configuration for CSI feedback from a network device.

[0290] Terminal device 220 then transmits 330 CSI feedback to network device 210 based on the at least one configuration.

[0291] In some embodiments, FIG. 4 illustrates an example according to some embodiments of the present disclosure. It should be understood that the specific structure shown in FIG. 4 is provided for illustrative purposes only and does not imply any limitation. In other words, the number of windows and / or the number of FD bases may be changed. In some embodiments, there may be a first window that is determined or indicated. For example, the first window may be for a reference CSI-RS resource of the second plurality of CSI-RS resources. In some embodiments, there may be a second window that is determined or indicated. For example, the second window may be for one of the remaining CSI-RS resources t (excluding the reference CSI-RS resource). In some embodiments, the first one of the FD basis vectors or the first one of the second vectors in the second window may be assumed to be selected for CSI-RS resource t (other than the reference CSI-RS resource) of the second plurality of CSI-RS resources, or may always be selected.

[0292] In some embodiments, the multiple partitions include parameters associated with one or more of the multiple CSI-RS allocations. If multiple CSI-RS allocations are available (i.e., multi-TRP is supported), the parameters may be transmitted according to different skip priorities, such that the priority rules for reporting CSI parameters are adaptively updated for scenarios in which multi-TRP is supported.

[0293] In some embodiments, terminal device 220 determines 320 priorities and includes parameters in multiple partitions of the CSI feedback based on the priorities. In some embodiments, terminal device 220 determines a first priority for each CSI-RS assignment among the multiple CSI-RS assignments. In this manner, the parameters may be transmitted in the order of priority of the CSI-RS assignments. Alternatively, in some other embodiments, terminal device 220 determines a second priority for each parameter among the parameters included in the CSI feedback. In this manner, the risk of dropping a parameter with a higher priority may be reduced.

[0294] In some embodiments, the priority may be determined based on one or more factors. One exemplary factor is the index of the CSI-RS resource. Another exemplary factor is the index of the CSI-RS resource group. Yet another exemplary factor is the index of the group of CSI-RS ports. Other factors include, but are not limited to, the index of the SD basis (e.g., the index of the SD basis corresponding to the CSI-RS allocation).

[0295] It should be understood that the above examples of factors are provided for illustrative purposes only and are not intended to imply any limitations. In other exemplary embodiments, other factors may be defined. The present disclosure is not limited in this respect.

[0296] Furthermore, in some embodiments, different factors are set to have different contributions when determining the priority, thus making the priority rules more flexible.

[0297] In some embodiments, the CSI parameters (or a first subset of PMI fields and / or CQI) corresponding to one TRP / TRP group (denoted as the first TRP / TRP group) have a higher priority than the CSI parameters (or other subsets of PMI fields and / or CQI) corresponding to other TRPs (i.e., subsets of TRPs / TRP groups other than the first TRP / TRP group, e.g., N-1 TRPs / TRP groups other than the first TRP / TRP group).

[0298] In some embodiments, for a given CSI feedback (e.g., CSI report #n), each reported element of the indication field (e.g., bitmap, amplitude coefficient, and phase coefficient) is indexed by one or more of the following parameters: ● r, the layer index; ● i, an SD base index (e.g., the index of the first base) among the multiple TRPs; ● i t , the SD basis index (e.g., the index of the second basis) corresponding to the TRP with index t; ● t, TRP index and ● f, the FD basis index (e.g., the index of the third basis); ● f t、 The FD basis index (e.g., the index of the third basis) corresponding to the TRP with index t.

[0299] 5 is a flowchart of an example method 500 according to some embodiments of the present disclosure. For example, the method 500 may be implemented in the terminal device 220 shown in FIG. 2A.

[0300] At block 510, terminal device 220 receives at least one configuration for CSI feedback from network device 210.

[0301] At block 520, terminal device 220 transmits CSI feedback to network device 210 based on the at least one configuration. The CSI feedback includes multiple partitions with different omission priorities, the multiple partitions including parameters associated with one or more of the multiple CSI-RS allocations.

[0302] In some embodiments, terminal device 220 determines priorities including at least one of a respective first priority for a CSI-RS allocation among a plurality of CSI-RS allocations or a respective second priority for a parameter among the parameters included in the CSI feedback. Terminal device 220 generates the CSI feedback based on the priorities. In other words, terminal device 220 generates the CSI feedback by including the parameters in a plurality of partitions of the CSI feedback based on the priorities.

[0303] 6 is a flowchart of an example method 600 according to some embodiments of the present disclosure. For example, the method 600 may be implemented in the network device 210 shown in FIG. 2A.

[0304] At block 610, network device 210 transmits at least one configuration for CSI feedback to terminal device 220.

[0305] At block 620, network device 210 receives CSI feedback from terminal device 220 based on the at least one configuration, the CSI feedback including multiple partitions with different omission priorities, the multiple partitions including parameters associated with one or more of the multiple CSI-RS allocations.

[0306] 7 is a schematic block diagram of an apparatus 700 suitable for implementing embodiments of the present disclosure. The apparatus 700 may be considered as another exemplary implementation of the terminal device 220 or the network device 210 as shown in FIG. 2. Accordingly, the apparatus 700 may be implemented in, or as at least a part of, the terminal device 220 or the network device 210.

[0307] As shown, the apparatus 700 comprises a processor 710, a memory 720 coupled to the processor 710, a suitable transmitter (TX) / receiver (RX) 740 coupled to the processor 710, and a communication interface coupled to the TX / RX 740. The memory 710 stores at least a portion of a program 730. The TX / RX 740 is used for bidirectional communication. The TX / RX 740 has at least one antenna to facilitate communication, although the access nodes referred to herein may in practice have multiple antennas. The communication interface may represent any interface required for communication with other network elements, such as an X2 / Xn interface for bidirectional communication between eNBs / gNBs, an S1 / NG interface for communication between a Mobility Management Entity (MME) / Access and Mobility Management Function (AMF) / SGW / UPF and an eNB / gNB, an Un interface for communication between an eNB / gNB and a relay node (RN), or a Uu interface for communication between an eNB / gNB and a terminal device.

[0308] The program 730 is assumed to include program instructions that, when executed by the associated processor 710, enable the device 700 to operate according to embodiments of the present disclosure, as described herein with reference to Figures 2-6. The embodiments herein may be implemented by computer software executable by the processor 710 of the device 700, by hardware, or by a combination of software and hardware. The processor 710 may be configured to implement various embodiments of the present disclosure. Furthermore, the combination of the processor 710 and the memory 720 may form a processing means 770 suitable for implementing various embodiments of the present disclosure.

[0309] Memory 720 may be of any type suitable for a local technology network and may be implemented using any suitable data storage technology, including, by way of non-limiting example, non-transitory computer-readable storage media, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. While only one memory 720 is shown in device 700, there may be several physically distinct memory modules within device 700. Processor 710 may be of any type suitable for a local technology network and may include, by way of non-limiting example, 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 700 may have multiple processors, for example, application-specific integrated circuit chips time-slaved to a clock that synchronizes the main processor.

[0310] In some embodiments, terminal device 220 comprises circuitry configured to receive at least one configuration for CSI feedback from network device 210 and to transmit CSI feedback to network device 210 based on the at least one configuration. The CSI feedback includes multiple partitions having different omission priorities, the multiple partitions including parameters associated with one or more of the multiple CSI-RS allocations.

[0311] In some embodiments, the circuitry is further configured to determine priorities including at least one of: a respective first priority for a CSI-RS allocation among the plurality of CSI-RS allocations; or a respective second priority for a parameter among the parameters included in the CSI feedback. Terminal device 220 generates the CSI feedback based on the priorities. In other words, terminal device 220 generates the CSI feedback by including the parameters in the plurality of partitions of the CSI feedback based on the priorities.

[0312] In another solution, a communication device comprises a processor configured to cause the device to perform any one of the methods.

[0313] Overall, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software executable by a controller, microprocessor, or other computing device. While various aspects of embodiments of the present disclosure have been illustrated and described using block diagrams, flowcharts, or other pictorial representations, it should be understood that the blocks, devices, systems, techniques, or methods described herein may be implemented, by way of non-limiting example, in hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing device, or any combination thereof.

[0314] The present 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 instructions included in program modules, that execute within a device on a target real or virtual processor to perform the processes or methods described above with reference to FIGS. 2-6. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between program modules as desired. The machine-executable instructions of the program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote storage media.

[0315] Program code for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, and when executed by the processor or controller, cause the program code to implement the functions / acts specified in the flowcharts and / or block diagrams. The program code may run entirely on the machine, partially on the machine, as a separate software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0316] The above-described program code may be embodied on a machine-readable medium, which may be any tangible medium that can contain or store a program used by or associated 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, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the aforementioned media. More specific examples of a machine-readable storage medium may include an electrical connection having one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0317] It should be noted that, although operations have been described in a particular order, it should not be understood that performing such operations in the particular order shown, or in any sequential order, or performing all of the operations described, is required to achieve desirable results. In some cases, multitasking and parallel processing may be advantageous. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to particular embodiments. Some features that are described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable subcombination.

[0318] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it should be understood that the present disclosure, as defined in the appended claims, is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A method of communication comprising: receiving, in the terminal device, from a network device, at least one configuration for one channel state information (CSI), the at least one configuration indicating at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources; determining a second plurality of CSI-RS resources that is the same as or a subset of the first plurality of CSI-RS resources; performing at least one of: determining a second number of at least one selected first vector based on the second plurality of CSI-RS resources; and determining a second number of at least one selected second vector based on the second plurality of CSI-RS resources and the at least one configuration; transmitting the CSI to the network device based on the at least one configuration; A method comprising:

2. at least one first number of the first vectors includes a first set of values, each value in the first set of values ​​indicating a first number of first vectors corresponding to each of the first plurality of CSI-RS resources, the number of values ​​in the first set being the same as the number of the first plurality of CSI-RS resources; At least one second number of the first vectors includes a second set of values, each value of the second set of values ​​indicating a second number of the first vector corresponding to a respective CSI-RS resource of the second plurality of CSI-RS resources, the number of values ​​of the second set being the same as the number of the second plurality of CSI-RS resources, a value of the second set of values ​​corresponding to a CSI-RS resource being less than or equal to a value of the first set of values ​​corresponding to the same CSI-RS resource, and each value of the second set of values ​​being greater than or equal to 1. The method of claim 1.

3. The at least one second number of the selected first vectors includes a first value for the first vector and a second value for the first vector, wherein the first value for the first vector indicates a second number of selected first vectors corresponding to a reference CSI-RS resource among the second plurality of CSI-RS resources, and the second value for the first vector indicates a second number of selected first vectors corresponding to remaining CSI-RS resources other than the reference CSI-RS resource among the second plurality of CSI-RS resources.

3. The method according to claim 1 or 2.

4. The at least one first number of the first vector includes a third value for the first vector and a fourth value for the first vector, the third value for the first vector being greater than or equal to the first value for the first vector, and the fourth value for the first vector being greater than or equal to the second value for the first vector. The method of claim 3.

5. determining an index of a second vector corresponding to each of the second plurality of CSI-RS resources; determining a set of selected second vectors from the first plurality of second vectors corresponding to each of the second plurality of CSI-RS resources; The first plurality of second vectors corresponding to each of the second plurality of CSI-RS resources are based on a first index of the second vector corresponding to each of the second plurality of CSI-RS resources and a second number of the selected second vectors. The method of claim 1.

6. determining a first field to indicate a set of selected second vectors corresponding to reference CSI-RS resources of the second plurality of CSI-RS resources; The set of selected second vectors corresponding to the reference CSI-RS resource of the second plurality of CSI-RS resources includes a second vector corresponding to a strongest coefficient indication. The method of claim 5.

7. determining a second field to indicate a set of selected second vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource among the second plurality of CSI-RS resources; The set of selected second vectors corresponding to the one CSI-RS resource other than the reference CSI-RS resource among the second plurality of CSI-RS resources includes a second vector having an index based on a first index of a second vector corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources and a second index of a second vector for the one CSI-RS resource other than the reference CSI-RS resource among the second plurality of CSI-RS resources. The method of claim 5.

8. determining a set of selected second vectors corresponding to reference CSI-RS resources of the second plurality of CSI-RS resources; determining an offset for one CSI-RS resource other than the reference CSI-RS resource among the second plurality of CSI-RS resources; determining a set of selected second vectors corresponding to one CSI-RS resource other than the reference CSI-RS resource among the second plurality of CSI-RS resources based on the offset and the set of selected second vectors corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources; The offset is a first index of the set of selected second vectors corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources; a last index of the set of selected second vectors corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources; a first index of the second vector corresponding to the reference CSI-RS resource among the second plurality of CSI-RS resources; The method according to claim 1 or 5.

9. The at least one setting further indicates at least one set of parameters, each set of parameters including a first parameter, a second parameter, and a third parameter. The method of claim 1.

10. A second number of the at least one selected second vector is determined based on a maximum value of the second parameter of the at least one set of parameters.

10. The method of claim 9.

11. the at least one set of parameters includes a first value of the second parameter and a second value of the second parameter; if the number of the second plurality of CSI-RS resources is one, a second number of the at least one selected second vector is determined based on the first value of the second parameter; if the number of the second plurality of CSI-RS resources is 2, 3, or 4, a second number of the at least one selected second vector is determined based on the second value of the second parameter; 10. The method of claim 9, comprising at least one of:

12. determining, in the terminal device, a size of a bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources; or determining a constraint on a total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources; The method of claim 1 further comprising:

13. A constraint on the size of the bitmap indicating non-zero coefficients and / or the total number of non-zero coefficients is determined based on a maximum value of the third parameter of the at least one set of parameters. The method of claim 12.

14. the at least one set of parameters includes a first value of the third parameter and a second value of the third parameter; if the number of the second plurality of CSI-RS resources is 1, a constraint on the size of the bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources or on the total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources is determined based on the first value of the third parameter; when the number of the second plurality of CSI-RS resources is 2, 3, or 4, a constraint on a size of a bitmap indicating non-zero coefficients corresponding to the second plurality of CSI-RS resources or a constraint on a total number of non-zero coefficients corresponding to the second plurality of CSI-RS resources is determined based on the second value of the third parameter; 13. The method of claim 9 or 12, further comprising at least one of:

15. a first number of at least one of the first vectors including two or more values, each value of the two or more values ​​indicating a number or a maximum number of selected first vectors corresponding to each of the first plurality of CSI-RS resources; the first number of at least one of the first vectors is a value, the value indicating a total number or a maximum total number of selected first vectors corresponding to all of the first plurality of CSI-RS resources or corresponding to all of the second plurality of CSI-RS resources; The method of claim 1 , further comprising at least one of:

16. A method of communication comprising: transmitting, in a network device, at least one configuration for one channel state information (CSI), the at least one configuration indicating at least one first number of first vectors, at least one first number of second vectors, and a number of a first plurality of channel state information reference signal (CSI-RS) resources to a terminal device; receiving the CSI from the terminal device based on the at least one configuration; A method comprising:

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