Method and device for reporting channel state information according to restricted measurement in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to operations of a user equipment and a base station in a wireless communication system. Specifically, disclosed are a method and device for reporting channel state information when a plurality of waveforms are applied to a downlink in a wireless communication system.

Description

Method and apparatus for reporting channel state information based on limited measurement in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method for reporting channel state information based on limited measurements in a wireless communication system and an apparatus capable of performing the same.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and Massive Machine-Type Communications (mMTC), technologies included beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands; support for various numerologies (such as operating multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources; initial access techniques to support multi-beam transmission and broadband; the definition and operation of Band-Width Parts (BWP); Low Density Parity Check (LDPC) codes for high-volume data transmission; new channel coding methods such as Polar Codes for the reliable transmission of control information; and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

[0004] Currently, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology, taking into account the services that the 5G mobile communication technology was intended to support. Additionally, standardization of the physical layer is in progress for technologies such as V2X (Vehicle-to-Everything), which helps autonomous vehicles make driving decisions and enhance user convenience based on their own location and status information transmitted by the vehicle; NR-U (New Radio Unlicensed), which aims for system operation in unlicensed bands to comply with various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) for supporting new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement including Conditional Handover and Dual Active Protocol Stack (DAPS) Handover, and 2-step Random Access (2-step RACH for NR) which simplifies random access procedures. Standardization is also underway in the field of system architecture / services for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) for incorporating Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas to guarantee coverage in the terahertz band of 6G mobile communication technology; metamaterial-based lenses and antennas; high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM); and Reconfigurable Intelligent Surface (RIS) technology to improve terahertz band signal coverage; as well as full-duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and Artificial Intelligence (AI) from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] The disclosed embodiments aim to provide an apparatus and method capable of effectively providing services in a mobile communication system. Specifically, the method and apparatus for reporting channel status information when a plurality of waveforms are applied in a downlink are provided.

[0009] One embodiment of the present disclosure for solving the above-mentioned problems comprises, in a method performed by a terminal of a communication system, the step of receiving setting information for a channel state information (CSI) report from a base station, wherein the setting information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension; the step of receiving CSI-RS setting information from the base station; the step of receiving a plurality of CSI-RS from the base station; the step of generating a CSI based on a CSI-RS received at one or more CSI-RS reception locations (occasions) among the received CSI-RS; and the step of transmitting the CSI report including the CSI to the base station, wherein at one or more CSI-RS reception locations, a CSI-RS with one or more waveforms applied is received.

[0010] In addition, a method performed by a base station of a communication system comprises the step of transmitting configuration information for a channel state information (CSI) report to a terminal, wherein the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension; the step of transmitting CSI-RS configuration information to the terminal; the step of transmitting a plurality of CSI-RS to the terminal; and the step of receiving the CSI report containing the CSI from the terminal, wherein the CSI is based on a CSI-RS transmitted at one or more CSI-RS reception locations (occasions) among the received CSI-RS, and wherein a CSI-RS with one or more waveforms applied is transmitted at the one or more CSI-RS reception locations.

[0011] In addition, a method performed by a terminal of a communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and capable of executing the at least one processor individually or in any combination thereof, wherein the terminal: receives configuration information for a channel state information (CSI) report from a base station, wherein the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension; receives CSI-RS configuration information from the base station; receives a plurality of CSI-RS from the base station; generates a CSI based on a CSI-RS received at one or more of the received CSI-RS reception locations (occasions); and stores an instruction to transmit the CSI report containing the CSI to the base station; wherein at one or more CSI-RS reception locations, a CSI-RS with one or more waveforms applied is received.

[0012] In addition, a method performed by a base station of a communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and capable of executing the at least one processor individually or in any combination thereof, wherein the base station: transmits configuration information for a channel state information (CSI) report to a terminal, wherein the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension, transmits CSI-RS configuration information to the terminal, transmits a plurality of CSI-RS to the terminal, and stores an instruction to receive the CSI report containing the CSI from the terminal; wherein the CSI is based on a CSI-RS transmitted at one or more CSI-RS reception occasions among the received CSI-RS, and wherein a CSI-RS with one or more waveforms applied is transmitted at one or more CSI-RS reception occasions.

[0013] The disclosed embodiment provides an apparatus and a method capable of effectively providing services in a mobile communication system. Specifically, by providing a method for reporting channel state information when multiple waveforms are applied in a downlink, an appropriate waveform can be selected so that communication can be performed efficiently.

[0014] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0015] Figure 2 is a diagram illustrating an example of a frame, subframe, and slot structure in a 5G system.

[0016] Figure 3 is a diagram illustrating an example of a bandwidth portion setting in a 5G communication system.

[0017] Figure 4 is a diagram illustrating an example of a control area in which a downlink control channel is transmitted in a 5G communication system.

[0018] FIG. 5 is a diagram illustrating an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in a 5G system.

[0019] FIG. 6 is a diagram showing the operation of a terminal for a multi-waveform-based CSI report according to one embodiment of the present disclosure.

[0020] FIG. 7 is a diagram illustrating the operation of a base station for multi-waveform-based CSI reporting according to one embodiment of the present disclosure.

[0021] FIG. 8 is a drawing illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0022] FIG. 9 is a drawing illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0023] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0024] In describing the embodiments, technical details that are well known in the art to which this disclosure belongs and are not directly related to this disclosure are omitted. This is intended to convey the essence of this disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0025] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0026] The advantages and features of the present disclosure, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the specification.

[0027] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (base station), radio access unit, base station controller, or a node on a network. A terminal may include a UE (user equipment), MS (mobile station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while LTE or LTE-A systems may be described as examples below, embodiments of this disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included therein, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0028] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0029] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0030] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (field programmable gate array) or an ASIC (application specific integrated circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0031] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards like 3GPP’s HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE’s 802.16e.

[0032] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs OFDM (orthogonal frequency division multiplexing, which can be combined with CP-OFDM (cyclic prefix-orthogonal frequency division multiplexing)) in the downlink and SC-FDMA (single carrier frequency division multiple access, which can be combined with DFTS-OFDM (discrete Fourier transform-spread-orthogonal frequency division multiplexing)) in the uplink. The above-mentioned multiple access method typically allows the data or control information of each user to be distinguished by allocating and operating time-frequency resources to be sent carrying data or control information for each user so that they do not overlap, that is, so that orthogonality is established.

[0033] As a future communication system following LTE, that is, a 5G communication system, it must be able to freely reflect the diverse requirements of users and service providers, and therefore, services that satisfy various requirements simultaneously must be supported. Services being considered for the 5G communication system include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra reliability low latency communication (URLC).

[0034] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, it necessitates improvements in various transmission and reception technologies, including enhanced multi-input multi-output (MIMO) transmission technology. Additionally, while LTE transmits signals using a maximum bandwidth of 20 MHz in the 2 GHz band, the 5G communication system can meet the data transmission speeds required by using a frequency bandwidth wider than 20 MHz in frequency bands of 3–6 GHz or above 6 GHz.

[0035] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for the connection of a large number of terminals within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT provides communication functions by attaching to various sensors and devices, a large number of terminals within a cell (e.g., 1,000,000 terminals / km²) 2 It must be able to support mMTC. In addition, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones where cells cannot cover, such as building basements, so they may require wider coverage compared to other services provided by the 5G communication system. Terminals supporting mMTC must consist of low-cost devices, and since it is difficult to frequently replace the device's battery, a very long battery life of 10 to 15 years may be required.

[0036] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For example, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and simultaneously 10 -5The following packet error rate requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a Transmit Time Interval (TTI) smaller than other services, and at the same time, design considerations may be required to allocate a wide resource in the frequency band to ensure the reliability of the communication link.

[0037] The three 5G services, namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. In this case, different transmission and reception techniques and parameters may be used between the services to satisfy the different requirements of each service. Of course, 5G is not limited to the three services mentioned above.

[0038] Hereinafter, a / b may be understood as at least one of a or b.

[0039] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0040] Figure 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0041] The horizontal axis of FIG. 1 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE, 101), which can be defined as one OFDM symbol (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can form a resource block (RB, 104). In the time axis, one subframe (110) may contain multiple OFDM symbols (102). For example, the length of one subframe may be 1 ms.

[0042] Figure 2 is a diagram illustrating an example of a frame, subframe, and slot structure in a 5G system.

[0043] FIG. 2 illustrates an example of a frame (200), subframe (201), and slot (202) structure. One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and thus one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( = 14). One subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per one subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In an example of FIG. 2, cases where μ=0 (204) and μ=1 (205) are shown as the setting value for the subcarrier spacing. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (203). That is, the number of slots per one subframe ( ) may vary, and accordingly, the number of slots per frame ( ) may vary. Depending on each subcarrier spacing setting μ and It can be defined by Table 1 below.

[0044] μ 014101114202214404314808414160165143203261464064

[0045] Next, the configuration of the bandwidth part (BWP) in a 5G communication system will be explained in detail with reference to the drawing.

[0046] Figure 3 is a diagram illustrating an example of a bandwidth portion setting in a 5G communication system.

[0047] FIG. 3 shows an example in which the terminal bandwidth (UE bandwidth, 300) is configured into two bandwidth parts, namely bandwidth part #1 (BWP#1, 301) and bandwidth part #2 (BWP#2, 302). The base station may configure one or more bandwidth parts for the terminal and may configure the information in Table 2 below for each bandwidth part.

[0048] BWP ::= SEQUENCE {bwp-Id BWP-Id,(Bandwidth Identifier)locationAndBandwidth INTEGER (1..65536),(Bandwidth Location)subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},(Subcarrier Spacing)cyclicPrefix ENUMERATED { extended}(Cyclical Prefix)}

[0049] Of course, the above examples are not limited, and various parameters related to bandwidth portions may be configured for the terminal in addition to the above configuration information. The above information may be transmitted by the base station to the terminal via higher-layer signaling, for example, radio resource control (RRC) signaling. Among the one or more configured bandwidth portions, at least one bandwidth portion may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via downlink control information (DCI).

[0050] According to some embodiments, prior to the RRC connection, the terminal may receive an initial bandwidth portion (initial BWP) for initial connection from the base station via a master information block (MIB). More specifically, during the initial connection phase, the terminal may receive configuration information for a control resource set (CORESET) and a search space via the MIB, through which a physical downlink control channel (PDCCH) for receiving system information required for initial connection (which may correspond to remaining system information (RMSI) or system information block 1 (SIB1)) can be transmitted. The control resource set and the search space configured via the MIB may each be considered as identity (ID) 0. The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and numerology, for control resource set #0. In addition, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and monitoring occasion for control area #0, i.e., configuration information for search area #0. The terminal may regard the frequency area set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be regarded as 0.

[0051] The terminal can receive the PDSCH (physical downlink shared channel) through which the SIB is transmitted via the configured initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion may also be used for other system information (OSI), paging, and random access.

[0052] The CSI resource configuration is described below. NR has a CSI framework for directing the measurement and reporting of Channel State Information (CSI) from a terminal at a base station. The CSI framework of NR can be composed of at least two elements: a resource setting and a report setting, and the report setting can have a connection relationship with the resource setting by referencing at least one ID of the resource setting.

[0053] According to one embodiment of the present disclosure, a resource setting may include information related to a reference signal (RS) for a terminal to measure channel state information. A base station may set at least one resource setting for a terminal. For example, a base station and a terminal may exchange signaling information such as that shown in Table 3 to transmit information regarding a resource setting.

[0054] -- ASN1START-- TAG-CSI-RESOURCECONFIG-STARTCSI-ResourceConfig ::= SEQUENCE {csi-ResourceConfigId CSI-ResourceConfigId,csi-RS-ResourceSetList CHOICE {nzp-CSI-RS-SSB SEQUENCE {nzp-CSI-RS-ResourceSetList SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourceSetsPerConfig)) OF NZP-CSI-RS-ResourceSetIdOPTIONAL, -- Need Rcsi-SSB-ResourceSetList SEQUENCE (SIZE (1..maxNrofCSI-SSB-ResourceSetsPerConfig)) OF CSI-SSB-ResourceSetIdOPTIONAL -- Need R},csi-IM-ResourceSetList SEQUENCE (SIZE (1..maxNrofCSI-IM-ResourceSetsPerConfig)) OF CSI-IM-ResourceSetId},bwp-Id BWP-Id,resourceType ENUMERATED { aperiodic, semiPersistent, periodic},...}-- TAG-CSI-RESOURCECONFIG-STOP-- ASN1STOP

[0055] In Table 3, the signaling information CSI-ResourceConfig contains information for each resource setting. According to the signaling information, each resource setting may include a resource setting index (csi-ResourceConfigId), a BWP index (bwp-ID), a resource time-axis transmission setting (resourceType), or a resource set list (csi-RS-ResourceSetList) containing at least one resource set. The resource time-axis transmission setting may be set to aperioditic transmission, semi-persistent transmission, or periodic transmission. The resource set list may be a set containing resource sets for channel measurement or a set containing resource sets for interference measurement. If the resource set list is a set containing resource sets for channel measurement, each resource set may include at least one resource, which may be a CSI reference signal (CSI-RS) resource or an index of a synchronous / broadcast channel block (SS / PBCH block, SSB). If the resource set list is a set containing resource sets for interference measurement, each resource set may include at least one interference measurement resource (CSI interference measurement, CSI-IM).

[0056] For example, if the resource set includes CSI-RS, the base station and the terminal can exchange signaling information such as Table 4 to transmit information about the resource set.

[0057] -- ASN1START-- TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet ::= SEQUENCE {nzp-CSI-ResourceSetId NZP-CSI-RS-ResourceSetId,nzp-CSI-RS-Resources SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,repetition ENUMERATED { on, off} OPTIONAL, -- Need SaperiodicTriggeringOffset INTEGER(0..6) OPTIONAL, -- Need Strs-Info ENUMERATED {true} OPTIONAL, -- Need R...}-- TAG-NZP-CSI-RS-RESOURCESET-STOP-- ASN1STOP

[0058] In Table 4, the signaling information NZP-CSI-RS-ResourceSet contains information for each resource set. According to the signaling information, each resource set contains at least information regarding the resource set index (nzp-CSI-ResourceSetId) or the set of indices of the included CSI-RS (nzp-CSI-RS-Resources), and may include some information regarding the spatial domain transmission filter of the included CSI-RS resource (repetition) or whether the included CSI-RS resource is used for tracking (trs-Info).

[0059] CSI-RS can be the most representative reference signal included in the resource set. The base station and the terminal can exchange signaling information such as that shown in Table 5 to transmit information about the CSI-RS resource.

[0060] -- ASN1START-- TAG-NZP-CSI-RS-RESOURCE-STARTNZP-CSI-RS-Resource ::= SEQUENCE {nzp-CSI-RS-ResourceId NZP-CSI-RS-ResourceId,resourceMapping CSI-RS-ResourceMapping,powerControlOffset INTEGER (-8..15),powerControlOffsetSS ENUMERATED{db-3, db0, db3, db6} OPTIONAL, -- Need RscramblingID ScramblingId,periodicityAndOffset CSI-ResourcePeriodicityAndOffset OPTIONAL, -- Cond PeriodicOrSemiPersistentqcl-InfoPeriodicCSI-RS TCI-StateId OPTIONAL, -- Cond Periodic...}-- TAG-NZP-CSI-RS-RESOURCE-STOP-- ASN1STOP

[0061] In Table 5, the signaling information NZP-CSI-RS-Resource contains information for each CSI-RS. The information included in the above signaling information NZP-CSI-RS-Resource may have the following meanings.

[0062] - nzp-CSI-RS-ResourceId: CSI-RS resource index

[0063] - resourceMapping: Resource mapping information of CSI-RS resources

[0064] - powerControlOffset: Ratio between PDSCH EPRE (Energy Per RE) and CSI-RS EPRE

[0065] - powerControlOffsetSS: Ratio between SS / PBCH block EPRE and CSI-RS EPRE

[0066] - scramblingID: Scrambling index of the CSI-RS sequence

[0067] - periodicityAndOffset: Transmission period and slot offset of the CSI-RS resource

[0068] - qcl-InfoPeriodicCSI-RS: TCI-state information if the corresponding CSI-RS is a periodic CSI-RS

[0069] The resourceMapping included in the above signaling information NZP-CSI-RS-Resource represents resource mapping information of the CSI-RS resource and may include frequency resource element (RE) mapping, number of ports, symbol mapping, CDM type, frequency resource density, and frequency band mapping information. The number of ports, frequency resource density, CDM type, and time-frequency axis RE mapping that can be configured through this may have a value set in one of the rows of Table 6 below.

[0070] [Table 6]

[0071]

[0072] Table 6 shows the frequency resource density, CDM type, frequency axis, and time axis start positions of the CSI-RS component RE pattern configurable according to the number of CSI-RS ports (X). ), represents the number of frequency axis REs (k') and the number of time axis REs (l') of the CSI-RS component RE pattern. The aforementioned CSI-RS component RE pattern may be a basic unit constituting a CSI-RS resource. Through Y=1+max(k') REs on the frequency axis and Z=1+max(l') REs on the time axis, the CSI-RS component RE pattern may be composed of YZ REs. When the number of CSI-RS ports is 1 port, the CSI-RS RE location can be specified without subcarrier restrictions within the PRB (physical resource block), and the CSI-RS RE location can be specified by a 12-bit bitmap. When the number of CSI-RS ports is {2, 4, 8, 12, 16, 24, 32} ports and Y=2, CSI-RS RE locations can be assigned for every two subcarriers within the PRB and can be assigned by a 6-bit bitmap. When the number of CSI-RS ports is 4 ports and Y=4, CSI-RS RE locations can be assigned for every four subcarriers within the PRB and can be assigned by a 3-bit bitmap. Similarly, time axis RE locations can be assigned by a total of 14-bit bitmaps.

[0073] According to one embodiment of the present disclosure, a report setting may have a connection relationship with a resource setting by referencing at least one ID of the resource setting, and the resource setting(s) having a connection relationship with the report setting provide setting information including information about a reference signal for measuring channel information. When the resource setting(s) having a connection relationship with the report setting are used for measuring channel information, the measured channel information may be used for channel information reporting according to a reporting method set in the report setting having a connection relationship.

[0074] According to one embodiment of the present disclosure, the report setting may include setting information related to the CSI reporting method. For example, a base station and a terminal may exchange signaling information such as that shown in Table 7 to transmit information regarding the report setting.

[0075] -- ASN1START-- TAG-CSI-REPORTCONFIG-STARTCSI-ReportConfig ::= SEQUENCE {reportConfigId CSI-ReportConfigId,carrier ServCellIndex OPTIONAL, -- Need SresourcesForChannelMeasurement CSI-ResourceConfigId,csi-IM-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, -- Need Rnzp-CSI-RS-ResourcesForInterference CSI-ResourceConfigId OPTIONAL, -- Need RreportConfigType CHOICE {periodic SEQUENCE {reportSlotConfig CSI-ReportPeriodicityAndOffset,pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource},semiPersistentOnPUCCH SEQUENCE {reportSlotConfig CSI-ReportPeriodicityAndOffset,pucch-CSI-ResourceList SEQUENCE (SIZE (1..maxNrofBWPs)) OF PUCCH-CSI-Resource},semiPersistentOnPUSCH SEQUENCE {reportSlotConfig ENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160, sl320},reportSlotOffsetList SEQUENCE (SIZE (1.. maxNrofUL-Allocations)) OF INTEGER(0..32),p0alpha P0-PUSCH-AlphaSetId},aperiodic SEQUENCE {reportSlotOffsetList SEQUENCE (SIZE (1..maxNrofUL-Allocations)) OF INTEGER(0..32)}},reportQuantity CHOICE {none NULL,cri-RI-PMI-CQI NULL,cri-RI-i1 NULL,cri-RI-i1-CQI SEQUENCE {pdsch-BundleSizeForCSI ENUMERATED {n2, n4} OPTIONAL -- Need S},cri-RI-CQI NULL,cri-RSRP NULL,ssb-Index-RSRP NULL,cri-RI-LI-PMI-CQI NULL},reportFreqConfiguration SEQUENCE {cqi-FormatIndicator ENUMERATED { widebandCQI, subbandCQI} OPTIONAL, -- Need Rpmi-FormatIndicator ENUMERATED { widebandPMI, subbandPMI} OPTIONAL, -- Need Rcsi-ReportingBand CHOICE {subbands3 BIT STRING(SIZE(3)),subbands4 BIT STRING(SIZE(4)),subbands5 BIT STRING(SIZE(5)),subbands6 BIT STRING(SIZE(6)),subbands7 BIT STRING(SIZE(7)),subbands8 BIT STRING(SIZE(8)),subbands9 BIT STRING(SIZE(9)),subbands10 BIT STRING(SIZE(10)),subbands11 BIT STRING(SIZE(11)),subbands12 BIT STRING(SIZE(12)),subbands13 BIT STRING(SIZE(13)),subbands14 BIT STRING(SIZE(14)),subbands15 BIT STRING(SIZE(15)),subbands16 BIT STRING(SIZE(16)),subbands17 BIT STRING(SIZE(17)),subbands18 BIT STRING(SIZE(18)),...,subbands19-v1530 BIT STRING(SIZE(19))} OPTIONAL -- Need S} OPTIONAL, -- Need RtimeRestrictionForChannelMeasurements ENUMERATED {configured, notConfigured},timeRestrictionForInterferenceMeasurements ENUMERATED {configured, notConfigured},codebookConfig CodebookConfig OPTIONAL, -- Need Rdummy ENUMERATED {n1, n2} OPTIONAL, -- Need RgroupBasedBeamReporting CHOICE {enabled NULL,disabled SEQUENCE {nrofReportedRS ENUMERATED {n1, n2, n3, n4} OPTIONAL -- Need S}},cqi-Table ENUMERATED {table1, table2, table3, spare1} OPTIONAL, -- Need RsubbandSize ENUMERATED {value1, value2},non-PMI-PortIndication SEQUENCE (SIZE (1..maxNrofNZP-CSI-RS-ResourcesPerConfig)) OF PortIndexFor8Ranks OPTIONAL, -- Need R...,[[semiPersistentOnPUSCH-v1530 SEQUENCE {reportSlotConfig-v1530 ENUMERATED {sl4, sl8, sl16}} OPTIONAL -- Need R]]}.

[0076] In Table 7, the signaling information CSI-ReportConfig contains information for each report setting. The information included in the above signaling information CSI-ReportConfig may have the following meanings.

[0077] - reportConfigId: report setting index

[0078] - carrier: Serving cell index

[0079] - resourcesForChannelMeasurement: Resource setting index for channel measurement linked to report setting

[0080] - csi-IM-ResourcesForInterference: Resource setting index containing CSI-IM resources for interference measurement that have a connection with the report setting

[0081] - nzp-CSI-RS-ResourcesForInterference: Resource setting index containing CSI-RS resources for interference measurement that have a relationship with the report setting

[0082] - reportConfigType: Indicates the time-axis transmission settings and transmission channel of the channel report, and can have aperioditic transmission, semi-persistent PUCCH (Physical Uplink Control Channel) transmission, semi-persistent PUSCH transmission, or periodic transmission settings.

[0083] - reportQuantity: Indicates the type of channel information being reported, and may have the type of channel information when no channel report is transmitted ('none') or when channel report is transmitted ('cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', 'cri-RSRP', 'ssb-Index-RSRP', 'cri-RI-LI-PMI-CQI'). Here, the elements included in the type of channel information refer to CQI (Channel Quality Indicator), PMI (Precoding Matric Indicator), CRI (CSI-RS Resource Indicator), SSBRI (SS / PBCH block Resource Indicator), Layer Indicator (LI), Rank Indicator (RI), and / or L1-RSRP (Reference Signal Received Power).

[0084] - reportFreqConfiguration: Indicates whether the reported channel information includes only wideband information or information for each subband; if information for each subband is included, it can have configuration information for the subband containing the channel information.

[0085] - timeRestrictionForChannelMeasurements: Whether there are time axis constraints on the reference signal for channel measurement among the reference signals referenced by the reported channel information.

[0086] - timeRestrictionForInterferenceMeasurements: Whether there are time axis constraints on the reference signal for interference measurement among the reference signals referenced by the reporting channel information.

[0087] - codebookConfig: Codebook information referenced by the reporting channel information

[0088] - groupBasedBeamReporting: Whether to group beams in channel reporting

[0089] - cqi-Table: CQI table index referenced by the reporting channel information

[0090] - subbandSize: An index indicating the subband size of the channel information

[0091] - non-PMI-PortIndication: Port mapping information referenced when reporting non-PMI channel information

[0092] When a base station instructs a channel information report through upper layer signaling or L1 signaling, the terminal can perform the channel information report by referring to the above-mentioned setting information included in the instructed report setting.

[0093] The base station can instruct the terminal to report channel state information (CSI) through upper layer signaling, including RRC signaling or MAC (medium access control) CE (control element) signaling, or L1 signaling (e.g., common DCI, group-common DCI, terminal-specific DCI).

[0094] For example, a base station may instruct a terminal to report aperiodic channel information (CSI report) via upper layer signaling or DCI using DCI format 0_1. The base station sets parameters for the terminal's aperiodic CSI report, or a plurality of CSI report trigger states, which include parameters for the CSI report, via upper layer signaling. The parameters for the CSI report or the CSI report trigger states may include a slot interval or a set of possible slot intervals between a PDCCH containing DCI and a PUSCH containing the CSI report, a reference signal ID for measuring channel state, and the type of channel information included. When the base station instructs some of the plurality of CSI report trigger states to the terminal via DCI, the terminal reports channel information according to the CSI report settings of the report settings configured in the instructed CSI report trigger states. The channel information reporting may be performed via a PUSCH scheduled in DCI format 0_1. The time-domain resource allocation of a PUSCH containing a terminal's CSI report can be achieved through the slot interval with the PDCCH indicated via the DCI, and the indication of the starting symbol and symbol length within the slot for the time-domain resource allocation of the PUSCH. For example, the location of the slot in which the PUSCH containing the terminal's CSI report is transmitted can be indicated via the slot interval with the PDCCH indicated via the DCI, and the starting symbol and symbol length within the slot can be indicated via the time domain resource assignment field of the aforementioned DCI.

[0095] For example, a base station may instruct a terminal to send a semi-persistent CSI report via a DCI using DCI format 0_1. The base station may activate or deactivate the semi-persistent CSI report sent via a DCI scrambled with SP-CSI-RNTI. When the semi-persistent CSI report is activated, the terminal may periodically report channel information according to a set slot interval. When the semi-persistent CSI report is deactivated, the terminal may stop the periodic channel information reporting that was activated. The base station establishes a number of CSI report trigger states containing parameters for the terminal's semi-persistent CSI report or parameters for the semi-persistent CSI report through upper layer signaling. Parameters for a CSI report, or CSI report trigger states, may include a set of possible slot intervals or slot intervals between a PDCCH containing a DCI directing a CSI report and a PUSCH containing a CSI report, a slot interval between a slot where an upper-layer signaling directing a CSI report is activated and a PUSCH containing a CSI report, a slot interval period of the CSI report, and the type of channel information included. When a base station activates some of a plurality of CSI report trigger states or some of a plurality of report settings to a terminal via upper-layer signaling or DCI, the terminal may report channel information according to the report setting included in the directed CSI report trigger state or the CSI report setting configured in the activated report setting.The above channel information reporting can be performed through a PUSCH that is semi-continuously scheduled in DCI format 0_1 ​​scrambled with SP-CSI-RNTI. Time-axis resource allocation for a PUSCH containing a terminal's CSI report can be achieved through the slot interval period of the CSI report, the slot interval with the slot where upper-layer signaling is activated, the slot interval with the PDCCH indicated via DCI, and the indication of the start symbol and symbol length within the slot for time-axis resource allocation of the PUSCH. For example, the location of the slot in which the PUSCH containing the terminal's CSI report is transmitted can be indicated through the slot interval with the PDCCH indicated via DCI, and the start symbol and symbol length within the slot can be indicated through the time domain resource assignment field of the aforementioned DCI format 0_1.

[0096] For example, a base station may instruct a terminal to transmit a semi-persistent CSI report via PUCCH through upper-layer signaling such as MAC-CE. Through the MAC-CE signaling, the base station may activate or deactivate the semi-persistent CSI report transmitted via PUCCH. When the semi-persistent CSI report is activated, the terminal may periodically report channel information according to a set slot interval. When the semi-persistent CSI report is deactivated, the terminal may stop the periodic channel information reporting that was activated. The base station sets parameters for the terminal's semi-persistent CSI report through upper-layer signaling. The parameters for the CSI report may include the PUCCH resource to which the CSI report is transmitted, the slot interval period of the CSI report, and the type of channel information included. The terminal may transmit the CSI report via PUCCH. Alternatively, if the PUCCH for the CSI report overlaps with the PUSCH, the CSI report can be transmitted to the PUSCH. The location of the PUCCH transmission slot containing the CSI report is indicated by the slot interval period of the CSI report set through upper layer signaling, and the slot interval between the slot where the upper layer signaling is activated and the PUCCH containing the CSI report. The starting symbol and symbol length within the slot can be indicated by the starting symbol and symbol length assigned to the PUCCH resource set through upper layer signaling.

[0097] For example, a base station may instruct a terminal to issue a periodic CSI report via upper layer signaling. The base station may enable or disable the periodic CSI report via upper layer signaling, including RRC signaling. When the periodic CSI report is enabled, the terminal may periodically report channel information according to a set slot interval. When the periodic CSI report is disabled, the terminal may stop the periodic channel information reporting that was enabled. The base station establishes a report setting via upper layer signaling that includes parameters for the terminal's periodic CSI report. The parameters for the CSI report may include the PUCCH resource setting for the CSI report, the slot interval between the slot where the upper layer signaling instructing the CSI report is enabled and the PUCCH containing the CSI report, the slot interval period of the CSI report, a reference signal ID for measuring channel state, and the type of channel information included. The terminal may transmit the CSI report via the PUCCH. Alternatively, if the PUCCH for the CSI report overlaps with the PUSCH, the CSI report can be transmitted via the PUSCH. The slot location where the PUCCH containing the CSI report is transmitted is indicated by the slot interval period of the CSI report set through upper layer signaling, and the slot interval between the slot where the upper layer signaling is activated and the PUCCH containing the CSI report. The starting symbol and symbol length within the slot can be indicated by the starting symbol and symbol length assigned to the PUCCH resource set through upper layer signaling.

[0098] Regarding the aforementioned CSI-ReportConfig, each CSI-ReportConfig report setting can be associated with a CSI resource setting associated with the corresponding report setting, and a single downlink bandwidth portion identified by the upper-layer parameter bandwidth portion identifier (bwp-id) provided by the CSI-ResourceConfig. As for the time-domain reporting operation for each CSI-ReportConfig report setting, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, which can be configured from the base station to the terminal by the reportConfigType parameter set from the upper layer. The semi-persistent CSI reporting methods support 'PUCCH-based semi-persistent (semi-PersistentOnPUCCH)' and 'PUSCH-based semi-persistent (semi-PersistentOnPUSCH)'. In the case of a periodic or semi-permanent CSI reporting method, the terminal may receive a PUCCH or PUSCH resource to transmit the CSI from the base station via upper layer signaling. The period and slot offset of the PUCCH or PUSCH resource to transmit the CSI may be given as the numerology of the uplink bandwidth portion configured for transmitting the CSI report. In the case of a non-periodic CSI reporting method, the terminal may receive a PUSCH resource to transmit the CSI scheduled from the base station via L1 signaling (the aforementioned DCI format 0_1).

[0099] For the aforementioned CSI resource setting (CSI-ResourceConfig), each CSI resource setting CSI-ReportConfig may include S (≥1) CSI resource sets (given by the upper-level parameter csi-RS-ResourceSetList). The CSI resource set list may consist of non-zero power (NZP) CSI-RS resource sets and SS / PBCH block sets, or may consist of CSI-interference measurement (CSI-IM) resource sets. Each CSI resource setting may be located in a downlink bandwidth portion identified by the upper-level parameter bwp-id, and the CSI resource setting may be linked to a CSI report setting in the same downlink bandwidth portion. The time domain operation of the CSI-RS resources within the CSI resource setting may be set to one of 'non-periodic', 'periodic', or 'semi-permanent' by the upper-level parameter resourceType. For periodic or semi-permanent CSI resource settings, the number of CSI-RS resource sets may be limited to S=1, and the set period and slot offset may be given by the numerology of the downlink bandwidth portion identified by bwp-id. The terminal may receive one or more CSI resource settings for channel or interference measurement from the base station via upper layer signaling, and may include, for example, the following CSI resources.

[0100] - CSI-IM resources for interference measurement

[0101] - NZP CSI-RS resources for interference measurement

[0102] - NZP CSI-RS resources for channel measurement

[0103] For CSI-RS resource sets associated with a resource setting where the upper-level parameter resourceType is set to 'Aperiodic', 'Periodic', or 'Semi-permanent', the Trigger State for a CSI reporting setting where reportType is set to 'Aperiodic' and the resource setting for channel or interference measurements for one or more component cells (CC) can be set as the upper-level parameter CSI-AperiodicTriggerStateList.

[0104] Non-periodic CSI reporting of the terminal can be performed using PUSCH, periodic CSI reporting can be performed using PUCCH, and semi-permanent CSI reporting can be performed using PUSCH when triggered or activated by DCI, and using PUCCH after activation by MAC CE. As described above, CSI resource settings can also be configured as non-periodic, periodic, or semi-permanent. Combinations between CSI reporting settings and CSI resource settings can be supported based on Table 8 below.

[0105] CSI-RS ConfigurationPeriodic CSI ReportingSemi-Persistent CSI ReportingAperiodic CSI ReportingPeriodic CSI-RSNo dynamic triggering / activationFor reporting on PUCCH, the UE receives an activation command [10, TS 38.321]; for reporting on PUSCH, the UE receives triggering on DCITriggered by DCI; additionally, activation command [10, TS 38.321] possible as defined in Subclause 5.2.1.5.1.Semi-Persistent CSI-RSNot SupportedFor reporting on PUCCH, the UE receives an activation command [10, TS 38.321]; for reporting on PUSCH, the UE receives triggering on DCITriggered by DCI; additionally, activation command [10, TS 38.321] possible as defined in Subclause 5.2.1.5.1.Aperiodic CSI-RSNot SupportedNot SupportedTriggered by DCI; additionally, activation command [10, TS 38.321] possible as defined in Subclause 5.2.1.5.1.

[0106] Non-periodic CSI reporting can be triggered by the "CSI request" field of the aforementioned DCI format 0_1, which corresponds to the scheduling DCI for PUSCH. The terminal can monitor PDCCH, obtain DCI format 0_1, and obtain scheduling information and CSI request indicators for PUSCH. The CSI request indicator is N Ts It can be set to bits (=0, 1, 2, 3, 4, 5, or 6) and can be determined by the upper layer signaling (reportTriggerSize). One of the trigger states among one or more non-periodic CSI report trigger states that can be set by the upper layer signaling (CSI-AperiodicTriggerStateList) may be triggered by the CSI request indicator. - If all bits of the CSI request field are 0, this may mean that no CSI report is requested.

[0107] - If the number of CSI trigger states (M) within the configured CSI-AperiodicTriggerStateLite is 2N Ts If it is greater than -1, according to the selected mapping relationship, the M CSI trigger states are 2N Ts It can be mapped to -1, and 2N Ts One of the trigger states of -1 can be indicated by the CSI request field.

[0108] - If the number of CSI trigger states (M) within the configured CSI-AperiodicTriggerStateLite is 2N Ts If it is less than or equal to -1, one of the M CSI trigger states can be indicated as the CSI request field.

[0109] Table 9 below shows an example of the relationship between CSI request indicators and CSI trigger states that can be indicated by those indicators.

[0110] CSI request fieldCSI trigger stateCSI-ReportConfigIdCSI-ResourceConfigId00no CSI requestN / AN / A01CSI trigger state#1CSI report#1CSI resource#1,CSI report#2CSI resource#210CSI trigger state#2CSI report#3CSI resource#311CSI trigger state#3CSI report#4CSI resource#4

[0111] For a CSI resource within a CSI trigger state triggered by a CSI request field, the terminal can perform a measurement and generate a CSI therefrom (including at least one of the aforementioned CQI, PMI, CRI, SSBRI, LI, RI, or L1-RSRP, etc.). The terminal can transmit the acquired CSI using a PUSCH scheduled by the corresponding DCI format 0_1. When the 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​indicates "1", the uplink data (UL-SCH) and the acquired CSI can be multiplexed and transmitted to the PUSCH resource scheduled by DCI format 0_1. If the 1 bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​indicates "0", CSI can be mapped and transmitted without uplink data (UL-SCH) to the PUSCH resource scheduled by DCI format 0_1.

[0112] Figure 3 is a diagram illustrating an example of a non-periodic CSI reporting method.

[0113] In one example (300) of FIG. 3, the terminal can monitor PDCCH (301) to obtain DCI format 0_1, and from this, obtain scheduling information and CSI request information for PUSCH (305). The terminal can obtain resource information for CSI-RS (302) to be measured from the received CSI request indicator. The terminal can determine at what point in time it should perform a measurement on the CSI-RS (302) resource being transmitted based on the time when it receives the DCI format 0_1 ​​and the parameter for the offset within the CSI resource set setting (e.g., the aperiodicTriggeringOffset described above) in the NZP CSI-RS resource set setting (NZP-CSI-RS-ResourceSet). More specifically, the terminal may receive the offset value X of the parameter aperiodicTriggeringOffset within the NZP-CSI-RS resource set setting as an upper layer signaling from the base station, and the set offset value X may represent the offset between the slot in which the DCI triggering the aperiodic CSI report is received and the slot in which the CSI-RS resource is transmitted. For example, the aperiodicTriggeringOffset parameter value and the offset value X may have a mapping relationship as described in Table 10 below.

[0114] aperiodicTriggeringOffsetOffset X00 slot11 slot22 slots33 slots44 slots516 slots624 slots

[0115] In one example (300) of FIG. 3, an example is shown in which the aforementioned offset value is set to X=0. In this case, the terminal can receive CSI-RS (302) in a slot (corresponding to slot 0 (306) in FIG. 3) that receives DCI format 0_1 ​​that triggers a non-periodic CSI report, and can report the CSI information measured by the received CSI-RS to the base station via PUSCH (305). The terminal can obtain scheduling information for PUSCH (305) for CSI reporting (information corresponding to each field of the aforementioned DCI format 0_1) from DCI format 0_1. For example, the terminal can obtain information about the slot to transmit PUSCH (305) from the aforementioned time domain resource allocation information for PUSCH (305) in DCI format 0_1. In one example (300) of FIG. 3, the terminal obtains a K2 value corresponding to the slot offset value for PDCCH-to-PUSCH as 3, and accordingly, at the time when PUSCH (305) receives PDCCH (301), it can be transmitted from slot 3 (309), which is 3 slots away from slot 0 (306). In one example (310) of FIG. 3, the terminal can monitor PDCCH (311) to obtain DCI format 0_1, and from this, can obtain scheduling information and CSI request information for PUSCH (315). The terminal can obtain resource information for CSI-RS (312) to be measured from the received CSI request indicator. One example (310) of FIG. 3 shows an example in which the offset value for the aforementioned CSI-RS is set to X=1. In this case, the terminal can receive CSI-RS (312) in the slot that receives DCI format 0_1 ​​that triggers a non-periodic CSI report (corresponding to slot 0 (316) in FIG. 3), and can report the CSI information measured by the received CSI-RS to the base station via PUSCH (315).

[0116] Aperiodic CSI reports may include at least one or both of CSI part 1 or CSI part 2, and when the aperiodic CSI reports are transmitted via PUSCH, they may be multiplexed with a transport block. For multiplexing, a CRC may be inserted into the input bits of the aperiodic CSI, followed by encoding and rate matching, and then mapped to a specific pattern in a resource element within PUSCH and transmitted. The above CRC insertion may be omitted depending on the coding method or the length of the input bits. The number of modulation symbols calculated for rate matching during the multiplexing of CSI part 1 or CSI part 2 included in the aperiodic CSI report can be calculated as follows.

[0117] For CSI part 1 transmission on PUSCH not using repetition type B with UL-SCH, the number of coded modulation symbols per layer for CSI part 1 transmission, denoted as Q' CSI-part1 , is determined as follows:

[0118]

[0119] …

[0120] For CSI part 1 transmission on an actual repetition of a PUSCH with repetition Type B with UL-SCH, the number of coded modulation symbols per layer for CSI part 1 transmission, denoted as Q' CSI-part1 , is determined as follows:

[0121]

[0122] …

[0123] For CSI part 1 transmission on PUSCH without UL-SCH, the number of coded modulation symbols per layer for CSI part 1 transmission, denoted as Q' CSI-part1 , is determined as follows:

[0124] if there is CSI part 2 to be transmitted on the PUSCH,

[0125]

[0126] else

[0127]

[0128] end if

[0129] …

[0130] For CSI part 2 transmission on PUSCH not using repetition type B with UL-SCH, the number of coded modulation symbols per layer for CSI part 2 transmission, denoted as Q' CSI-part2 , is determined as follows:

[0131]

[0132]

[0133] For CSI part 2 transmission on an actual repetition of a PUSCH with repetition Type B with UL-SCH, the number of coded modulation symbols per layer for CSI part 2 transmission, denoted as Q' CSI-part2 , is determined as follows:

[0134]

[0135] …

[0136] For CSI part 2 transmission on PUSCH without UL-SCH, the number of coded modulation symbols per layer for CSI part 2 transmission, denoted as Q' CSI-part2 , is determined as follows:

[0137]

[0138] In particular, for PUSCH repetition transmission methods A and B, the terminal can transmit aperiodic CSI reports by multiplexing them only during the first repetition of the PUSCH repetition. This is because the aperiodic CSI report information being multiplexed is encoded in a polar code format, and for it to be multiplexed across multiple PUSCH repetitions, each PUSCH repetition must have the same frequency and time resource allocation. Furthermore, specifically in the case of PUSCH repetition type B, since each actual repetition can have a different OFDM symbol length, the aperiodic CSI reports can be multiplexed and transmitted only during the first PUSCH repetition.

[0139] Additionally, regarding PUSCH repeat transmission method B, if the terminal receives a DCI that schedules a non-periodic CSI report or enables semi-permanent CSI report without scheduling for the transport block, the value of the nominal repetition may be assumed to be 1 even if the number of PUSCH repeat transmissions set by the upper layer signaling is greater than 1. Additionally, if the terminal schedules or enables a non-periodic or semi-permanent CSI report without scheduling for the transport block based on PUSCH repeat transmission method B, the terminal may expect the first nominal repetition to be the same as the first actual repetition. For a PUSCH transmitted including the semi-permanent CSI based on PUSCH repeat transmission method B without scheduling for the DCI after semi-permanent CSI report is enabled by the DCI, if the first nominal repetition is different from the first actual repetition, the transmission for the first nominal repetition may be ignored.

[0140] The CSI reference resource is described below. When a base station instructs a terminal to issue an aperiodic / semi-persistent / periodic CSI report, it may set a CSI reference resource to determine the reference time and frequency for the channel to be reported in the CSI report. The frequency of the CSI reference resource may be the carrier and subband information for measuring the CSI specified in the CSI report configuration, which may correspond to the carrier and reportFreqConfiguration, respectively, within the upper-layer signaling CSI-ReportConfig. The time of the CSI reference resource may be defined based on the time at which the CSI report is transmitted. For example, if CSI report #X is instructed to be transmitted in the uplink slot n' of the carrier and BWP to which the CSI report is to be transmitted, the time of the CSI reference resource for CSI report #X may be defined as the downlink slot n-nCSI-ref of the carrier and BWP measuring the CSI. When downlink slot n is named μDL for the numerology of the carrier and BWP measuring CSI, and μUL for the numerology of the carrier and BWP transmitting CSI report #X It is calculated as follows. nCSI-ref, the slot interval between downlink slot n and the CSI reference signal, depends on the number of CSI-RS / SSB resources for channel measurement when CSI report #X transmitted in uplink slot n' is a semi-persistent or periodic CSI report; if a single CSI-RS / SSB resource is connected to the said CSI report, n CSI-ref = 4·2 μDL If it follows and multiple CSI-RS / SSB resources are connected to the relevant CSI report, n CSI-ref = 5·2 μDLFollows. If the CSI report #X transmitted in uplink slot n' is an aperiodic CSI report, considering the CSI computation time Z' for channel measurement It is calculated as. The aforementioned N symb slot is the number of symbols included in a slot, and in NR, it is N symb slot Assume =14.

[0141] When a base station instructs a terminal to transmit a CSI report in uplink slot n' via upper layer signaling or DCI, the terminal may report a CSI by performing channel measurement or interference measurement on a CSI-RS resource, CSI-IM resource, or SSB resource associated with the CSI report that is transmitted no later than the CSI reference resource slot of the CSI report transmitted in uplink slot n'. The CSI-RS resource, CSI-IM resource, or SSB resource associated with the above-mentioned CSI report may refer to a CSI-RS resource, CSI-IM resource, or SSB resource included in a resource set configured in a resource setting referenced by a report setting for a CSI report of a terminal configured through upper layer signaling, or a CSI-RS resource, CSI-IM resource, or SSB resource referenced by a CSI report trigger state containing parameters for the CSI report, or a CSI-RS resource, CSI-IM resource, or SSB resource pointed to by an ID of a reference signal (RS) set.

[0142] In embodiments of the present disclosure, a CSI-RS / CSI-IM / SSB occasion refers to the transmission time of a CSI-RS / CSI-IM / SSB resource(s) determined by an upper layer setting or a combination of an upper layer setting and DCI triggering. For example, for a semi-persistent or periodic CSI-RS resource, the slot to be transmitted is determined by the slot period and slot offset set by the upper layer signaling, and the transmitted symbol(s) within the slot are determined by the resource mapping information. For another example, for an aperiodic CSI-RS resource, the slot to be transmitted is determined by the slot offset with the PDCCH containing the DCI indicating channel reporting set by the upper layer signaling, and the transmitted symbol(s) within the slot are determined by the resource mapping information.

[0143] The aforementioned CSI-RS occasion can be determined by independently considering the transmission time of each CSI-RS resource or by comprehensively considering the transmission time of one or more CSI-RS resource(s) included in the resource set; accordingly, the following two interpretations are possible for the CSI-RS occasion according to each resource set setting.

[0144] - Interpretation 1-1: From the start time of the earliest symbol to the end time of the latest symbol during which a specific resource among one or more CSI-RS resources included in the resource set(s) configured in the resource setting referenced by the report setting configured for the CSI report is transmitted.

[0145] - Interpretation 1-2: Among all CSI-RS resources included in the resource set(s) configured in the resource setting referenced by the report setting configured for the CSI report, from the start time of the earliest symbol transmitted by the earliest transmitted CSI-RS resource to the end time of the latest symbol transmitted by the latest transmitted CSI-RS resource

[0146] In the embodiments of the present disclosure below, it is possible to individually apply both interpretations of the CSI-RS occasion. Additionally, while it is possible to consider both interpretations for the CSI-IM occasion and the SSB occasion, just as with the CSI-RS occasion, the principle is similar to the explanation above, so redundant explanations will be omitted below.

[0147] In embodiments of the present disclosure, 'CSI-RS / CSI-IM / SSB occasion for CSI report #X transmitted in uplink slot n'' refers to a set of CSI-RS occasions, CSI-IM occasions, and SSB occasions among the CSI-RS resource, CSI-IM resource, and SSB resource CSI-RS occasions, CSI-IM occasions, and SSB occasions included in the resource set of the resource setting referenced by the report setting set for CSI report #X, which are not later than the CSI reference resource of CSI report #X transmitted in uplink slot n'.

[0148] In the embodiments of the present disclosure, the latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in 'uplink slot n' can be interpreted in the following two ways.

[0149] - Interpretation 2-1: A set of occasions including the latest CSI-RS occasion for CSI report #X transmitted in uplink slot n', the latest CSI-IM occasion for CSI report #X transmitted in uplink slot n', and the latest SSB occasion for CSI report #0 transmitted in uplink slot n'.

[0150] - Interpretation 2-2: The latest occasion among the CSI-RS occasion, CSI-IM occasion, and SSB occasion for CSI report #X transmitted in uplink slot n'.

[0151] In the embodiments of the present disclosure below, it is possible to apply individually by considering both interpretations of the ‘latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n’. Additionally, when considering the two interpretations (interpretation 1-1, interpretation 1-2) described above for the CSI-RS occasion, CSI-IM occasion, and SSB occasion, in the embodiments of the present disclosure, the “latest CSI-RS / CSI-IM / SSB occasion among the CSI-RS / CSI-IM / SSB occasions for CSI report #X transmitted in uplink slot n’” can be applied individually by considering all four different interpretations (applying interpretation 1-1 and interpretation 2-1, applying interpretation 1-1 and interpretation 2-2, applying interpretation 1-2 and interpretation 2-1, applying interpretation 1-2 and interpretation 2-2).

[0152] The base station may instruct a CSI report by considering the amount of channel information that the terminal can simultaneously calculate for the CSI report, that is, the number of the terminal's channel information processing units (CSI processing units, CPUs). The number of channel information processing units that the terminal can simultaneously calculate is N CPU If so, the terminal is N CPU If you do not expect CSI report instructions from base stations that require more channel information calculations, or N CPU Updates to channel information that require more channel information calculations may not be considered. N CPU The terminal can report to the base station via upper layer signaling, or the base station can set it via upper layer signaling.

[0153] The CSI report instructed by the base station to the terminal is the total number of channel information N that the terminal can calculate simultaneously. CPU Assume that some or all of the CPUs are occupied for channel information calculation. For each CSI report, for example, the number of channel information calculation units required for CSI report n (n=0, 1, ..., N-1) If so, the number of channel information calculation units required for a total of N CSI reports is It can be said that the calculation unit for channel information required per reportQuantity set in the CSI report can be set as shown in the following Table 11.

[0154] - : When the reportQuantity set in the CSI report is set to 'none', and trs-Info is set in the CSI-RS resource set connected to the CSI report- : If the reportQuantity set in the CSI report is set to 'none', 'cri-RSRP', or 'ssb-Index-RSRP', and trs-Info is not set in the CSI-RS resource set associated with the CSI report - If the reportQuantity set in the CSI report is set to 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', or 'cri-RI-LI-PMI-CQI' >> : When a non-periodic CSI report is triggered and the said CSI report is not multiplexed with one or both of TB / HARQ-ACK. The said CSI report is a wideband CSI corresponding to a maximum of 4 CSI-RS ports, corresponds to a single resource without a CRI report, and corresponds to codebookType 'typeI-SinglePanel' or reportQuantity 'cri-RI-CQI' (this case corresponds to the aforementioned delay requirement 1, which can be viewed as a situation where the terminal uses all available CPUs to quickly calculate and report the CSI) : All other cases except the above case. K s indicates the number of CSI-RS resources within the CSI-RS resource set for channel measurement.

[0155] The number of channel information calculations required by the terminal for multiple CSI reports at a specific point in time is the number of channel information calculation units N that the terminal can calculate simultaneously. CPUIn more cases, the terminal may not consider updating channel information for some CSI reports. Among multiple directed CSI reports, the CSI reports for which channel information updates are not considered are determined by taking into account at least the time the calculation of channel information required for the CSI report occupies the CPU and the priority of the reported channel information. For example, it may not consider updating channel information for a CSI report where the calculation of channel information required for the CSI report starts at the latest time, and it is possible to prioritize not considering channel information updates for CSI reports with lower channel information priority.

[0156] The priority of the above channel information can be determined by referring to Table 12 below.

[0157] CSI priority value ,- y=0 if it is an aperiodic CSI report transmitted via PUSCH, y=1 if it is a semi-persistent CSI report transmitted via PUSCH, y=2 if it is a semi-persistent CSI report transmitted via PUCCH, y=3 if it is a periodic CSI report transmitted via PUCCH;- k=0 if the CSI report contains L1-RSRP, k=1 if the CSI report does not contain L1-RSRP;- c : serving cell index, N cells :Maximum number of serving cells set by upper layer signaling (maxNrofServingCells);- s :CSI report configuration index (reportConfigID), :Maximum number of CSI report configurations set by upper layer signaling (maxNrofCSI-ReportConfigurations).

[0158] The CSI priority for the CSI report is the priority value Pri in Table 12. iCSI It is determined through (y,k,c,s). Referring to Table 12, the CSI priority value is determined by the type of channel information included in the CSI report, the temporal reporting characteristics of the CSI report (aperiodic, semi-persistent, periodic), the channel through which the CSI report is transmitted (PUSCH, PUCCH), the serving cell index, and the CSI report configuration index. The CSI priority for a CSI report is the priority value Pri iCSI By comparing (y,k,c,s), it is determined that the CSI report with the smaller priority value has a higher CSI priority.

[0159] If CPU occupation time is defined as the time the CPU is occupied by calculating channel information required for the CSI report instructed by the base station to the terminal, then CPU occupation time is determined by considering the type of channel information included in the CSI report (report quantity), the time-axis characteristics of the CSI report (aperiodic, semi-persistent, periodic), the slots or symbols occupied by the upper-layer signaling or DCI instructing the CSI report, and part or all of the slots or symbols occupied by the reference signal for channel state measurement.

[0160] Next, we will explain downlink control information (DCI) in 5G systems in detail.

[0161] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink data channel (PDSCH)) is transmitted from the base station to the terminal via DCI. The terminal can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields selected between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0162] DCI can be transmitted via the PDCCH, a physical downlink control channel, after undergoing channel coding and modulation processes. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC can be scrambled into a radio network temporary identifier (RNTI) corresponding to the terminal's identity. Different RNTIs may be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI is not explicitly transmitted but is included in the CRC calculation process. Upon receiving a DCI message transmitted over the PDCCH, the terminal checks the CRC using the assigned RNTI; if the CRC check result is correct, the terminal knows that the message was sent to it.

[0163] For example, a DCI scheduling a PDSCH for system information (SI) can be scrambled to SI-RNTI. A DCI scheduling a PDSCH for a random access response (RAR) message can be scrambled to RA-RNTI. A DCI scheduling a PDSCH for a paging message can be scrambled to P-RNTI. A DCI notifying a slot format indicator (SFI) can be scrambled to SFI-RNTI. A DCI notifying a transmit power control (TPC) can be scrambled to TPC-RNTI. A DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled to C-RNTI (cell RNTI).

[0164] DCI format 0_0 can be used as a countermeasure DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI may include, for example, the information in Table 13 below.

[0165] - Identifier for DCI formats - [1] bit- Frequency domain resource assignment -[ ] bits- Time domain resource assignment - X bits- Frequency hopping flag - 1 bit- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- TPC command for scheduled PUSCH - [2] bits- UL / SUL indicator - 0 or 1 bit

[0166] DCI format 0_1 ​​can be used as a non-defense DCI for scheduling PUSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI may include, for example, the information in Table 4 below.

[0167] - Carrier indicator - 0 or 3 bits - UL / SUL indicator - 0 or 1 bit - Identifier for DCI formats - [1] bits - Bandwidth part indicator - 0, 1 or 2 bits - Frequency domain resource assignment - For resource allocation type 0, bits- For resource allocation type 1, bits- Time domain resource assignment -1, 2, 3, or 4 bits- VRB-to-PRB mapping (virtual resource block-to-physical resource block mapping) - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- Frequency hopping flag - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- 1st downlink assignment index (first downlink allocation index)- 1 or 2 bits○ 1 bit for semi-static HARQ-ACK codebook (semi-static HARQ-ACK In case of codebook);○ 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook (when a dynamic HARQ-ACK codebook is used with a single HARQ-ACK codebook).- 2nd downlink assignment index - 0 or 2 bits ○ 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks (when a dynamic HARQ-ACK codebook is used with two HARQ-ACK sub-codebooks); ○ 0 bit otherwise.TPC command for scheduled PUSCH - 2 bits- SRS resource indicator (SRS resource indicator) -. or bits○ bits for non-codebook based PUSCH transmission(if PUSCH transmission is not codebook-based);○ bits for codebook-based PUSCH transmission. - Precoding information and number of layers - up to 6 bits - Antenna ports - up to 5 bits - SRS request - 2 bits - CSI request - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association - 0 or 2 bits - beta_offset indicator - 0 or 2 bits - DMRS sequence initialization - 0 or 1 bit

[0168] DCI format 1_0 can be used as a countermeasure DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI may include, for example, the information in Table 15 below.

[0169] - Identifier for DCI formats - [1] bit- Frequency domain resource assignment -[ ] bits- Time domain resource assignment - X bits- VRB-to-PRB mapping - 1 bit- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- Downlink assignment index - 2 bits- TPC command for scheduled PUCCH - [2] bits- PUCCH resource indicator - 3 bits- PDSCH-to-HARQ feedback timing indicator - [3] bits

[0170] DCI format 1_1 can be used as a non-defense DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI may include, for example, the information in Table 16 below.

[0171] - Carrier indicator - 0 or 3 bits- Identifier for DCI formats - [1] bits- Bandwidth part indicator - 0, 1 or 2 bits- Frequency domain resource assignment○ For resource allocation type 0, bits○ For resource allocation type 1, bits- Time domain resource assignment -1, 2, 3, or 4 bits- VRB-to-PRB mapping - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- PRB bundling size indicator - 0 or 1 bit - Rate matching indicator - 0, 1, or 2 bits - ZP CSI-RS trigger - 0, 1, or 2 bits - For transport block 1: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - For transport block 2: - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 0 or 2 or 4 bits - TPC command for scheduled PUCCH - 2 bits - PUCCH resource indicator - 3 bits - PDSCH-to-HARQ_feedback timing indicator - 3 bits - Antenna ports 4, 5, or 6 bits - Transmission configuration indication - 0 or 3 bits - SRS request - 2 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - CBG flushing out information - 0 or 1 bit - DMRS sequence initialization - 1 bit.

[0172] In the following, the downlink control channel in a 5G communication system will be explained in more detail with reference to the drawings.

[0173] FIG. 4 illustrates an example of a control resource set (CORESET) in which a downlink control channel is transmitted in a 5G communication system. FIG. 4 illustrates an example in which two control resources (control resource #1 (401), control resource #2 (402)) are set within a terminal bandwidth part (UE bandwidth part, 410) on the frequency axis and within one slot (420) on the time axis. The control resources (401, 402) can be set in a specific frequency resource (403) within the entire terminal bandwidth part (410) on the frequency axis. On the time axis, they can be set with one or more OFDM symbols and can be defined as the control resource set duration (404). Referring to the example illustrated in FIG. 4, control resource #1 (401) is set with a control resource length of 2 symbols, and control resource #2 (402) is set with a control resource length of 1 symbol.

[0174] The control domain in the aforementioned 5G can be configured by a base station to a terminal through upper-layer signaling (e.g., system information, MIB, RRC signaling). Configuring a control domain to a terminal means providing information such as the control domain identifier, the frequency location of the control domain, and the symbol length of the control domain. For example, it may include the information in Table 17 below.

[0175] ControlResourceSet ::= SEQUENCE {-- Corresponds to L1 parameter 'CORESET-ID'controlResourceSetId ControlResourceSetId,(Control Domain Identifier(Identity))frequencyDomainResources BIT STRING (SIZE (45)),(Frequency Axis Resource Allocation Info)duration INTEGER (1..maxCoReSetDuration),(Time Axis Resource Allocation Info)cce-REG-MappingType CHOICE {(CCE-to-REG Mapping Type)interleaved SEQUENCE {reg-BundleSize ENUMERATED {n2, n3, n6},(REG Bundle Size)precoderGranularity ENUMERATED {sameAsREG-bundle, allContiguousRBs},interleaverSize ENUMERATED {n2, n3, n6}(Interleaver Size)shiftIndex INTEGER(0..maxNrofPhysicalResourceBlocks-1) OPTIONAL(Interleaved Shift)},nonInterleaved NULL},tci-StatesPDCCH SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL,(QCL setting information)tci-PresentInDCI ENUMERATED {enabled} OPTIONAL, -- Need S}

[0176] In Table 17, the tci-StatesPDCCH (simply named TCI state) configuration information may include information on one or more SS / PBCH block (synchronization signal / physical broadcast channel block) indices or CSI-RS (channel state information reference signal) indices that are in a relationship with DMRS and QCL transmitted in the corresponding control area. FIG. 5 is a diagram illustrating an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in a 5G system. According to FIG. 5, the basic unit of time and frequency resources that constitute the control channel can be called a REG (resource element group, 503), and the REG (503) can be defined as 1 OFDM symbol (501) on the time axis and 1 PRB (physical resource block, 502) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (503) to form a downlink control channel allocation unit.

[0177] As illustrated in FIG. 5, if the basic unit to which a downlink control channel is allocated in a 5G system is called a CCE (control channel element, 504), then 1 CCE (504) can be composed of multiple REGs (503). For example, if the REG (503) illustrated in FIG. 5 is described, the REG (503) can be composed of 12 REs, and if 1 CCE (504) is composed of 6 REGs (503), then 1 CCE (504) can be composed of 72 REs. When a downlink control area is established, the area can be composed of multiple CCEs (504), and a specific downlink control channel can be mapped to one or multiple CCEs (504) and transmitted according to the aggregation level (AL) within the control area. The CCEs (504) within the control area are distinguished by numbers, and the numbers of the CCEs (504) can be assigned according to a logical mapping method.

[0178] The basic unit of the downlink control channel, namely the REG (503) shown in FIG. 5, may include both the REs to which the DCI is mapped and the DMRS (505), which is a reference signal (RS) for decoding it, to which the area is mapped. As shown in FIG. 5, three DMRS (505) may be transmitted within one REG (503). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level, and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The terminal must detect the signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates consisting of CCEs that a terminal must attempt to decode on a given aggregation level, and since there are various aggregation levels that form a group of 1, 2, 4, 8, or 16 CCEs, a terminal may have multiple search spaces. A search space set can be defined as a set of search spaces on all configured aggregation levels.

[0179] Search spaces can be classified into common search spaces and UE-specific search spaces. A certain group of terminals or all terminals may examine the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages regarding system information. For example, PDSCH scheduling allocation information for the transmission of SIBs containing cell operator information can be received by examining the common search space of the PDCCH. In the case of the common search space, since a certain group of terminals or all terminals must receive the PDCCH, it can be defined as a set of pre-agreed CCEs. Scheduling allocation information for a UE-specific PDSCH or PUSCH can be received by examining the UE-specific search space of the PDCCH. The UE-specific search space can be defined specifically as a function of the terminal's identity and various system parameters.

[0180] In a 5G system, parameters for the search space for a PDCCH can be configured from the base station to the terminal via upper-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may configure the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the control domain index to be monitored in the search space. For example, the information in Table 18 below may be included.

[0181] SearchSpace ::= SEQUENCE {-- Identity of the search space. SearchSpaceId = 0 identifies the SearchSpace configured via PBCH (MIB) or ServingCellConfigCommon.searchSpaceId SearchSpaceId,(Search Space Identifier)controlResourceSetId ControlResourceSetId,(Control Area Identifier)monitoringSlotPeriodicityAndOffset CHOICE {(Monitoring Slot Level Period)sl1 NULL,sl2 INTEGER (0..1),sl4 INTEGER (0..3),sl5 INTEGER (0..4),sl8 INTEGER (0..7),sl10 INTEGER (0..9),sl16 INTEGER (0..15),sl20 INTEGER (0..19)} OPTIONAL,duration(Monitoring Length) INTEGER (2..2559)monitoringSymbolsWithinSlot BIT STRING (SIZE (14)) OPTIONAL,(슬롘 내 나이스 심보)nrofCandidates SEQUENCE {(집성 별보 PDCCH 이리군 수)aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel4 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel8 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel16 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}},searchSpaceType CHOICE {(தமம்ப்புக்குக்க்கு திய்)-- Configures this search space as common search space (CSS) and DCI formats to monitor.common SEQUENCE {(공통이이국이)}ue-Specific SEQUENCE {(단말-특정이스국)-- Indicates whether the UE monitors in this USS for DCI formats 0-0 and 1-0 or for formats 0-1 and 1-1.formats ENUMERATED {formats0-0-And-1-0, formats0-1-And-1-1},...}.

[0182] According to the configuration information, the base station may configure one or more sets of search spaces for the terminal. According to some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, configure DCI format A scrambled with X-RNTI in search space set 1 to be monitored in the common search space, and configure DCI format B scrambled with Y-RNTI in search space set 2 to be monitored in the terminal-specific search space. According to the configuration information, one or more sets of search spaces may exist in the common search space or the terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as the common search space, and search space set #3 and search space set #4 may be configured as the terminal-specific search space.

[0183] In the common search space, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0184] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0185] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0186] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0187] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0188] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0189] In terminal-specific search spaces, the following combinations of DCI formats and RNTI can be monitored. Of course, they are not limited to the examples below.

[0190] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0191] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0192] The specified RNTIs may follow the definitions and uses below.

[0193] C-RNTI (cell RNTI): Used for terminal-specific PDSCH scheduling

[0194] TC-RNTI (temporary cell RNTI): Used for terminal-specific PDSCH scheduling

[0195] CS-RNTI (configured scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0196] RA-RNTI (random access RNTI): Used for PDSCH scheduling during the random access phase

[0197] P-RNTI (paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0198] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0199] INT-RNTI (interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0200] TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0201] TPC-PUCCH-RNTI (transmit power control for PUCCH (physical uplink control channel) RNTI): Used to instruct power regulation commands to the PUCCH

[0202] TPC-SRS-RNTI (transmit power control for SRS (sounding reference signal) RNTI): Used to instruct power control commands to the SRS

[0203] The aforementioned specified DCI formats may follow the definitions in Table 19 below.

[0204] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0205] In a 5G system, the search space of aggregation level L in CORESET p and search space set s can be expressed as Equation 1 below.

[0206] [Mathematical Formula 1]

[0207]

[0208] - L: Lamination Level

[0209] - n CI : Carrier Index

[0210] - n CCE,p : Total number of CCEs existing in CORESET p

[0211] - : Slot Index

[0212] - : Number of PDCCH candidates at assembly level L

[0213] - = 0, ..., -1: PDCCH candidate index of aggregation level L

[0214] - l = 0, ..., L -1

[0215] - , Y p,-1 = nRNTI≠0, A p = 39827 for p mod 3 = 0, A p = 39829 for p mod 3 = 1, A p = 39839 for p mod 3 = 2, D= 65537

[0216] - n RNTI : Terminal identifier

[0217] The value may be 0 for the common search space.

[0218] In the case of a terminal-specific search space, the value may correspond to a value that changes according to the terminal's identity (C-RNTI or ID set by the base station for the terminal) and the time index.

[0219] In a 5G system, as multiple sets of search spaces can be configured with different parameters (e.g., the parameters in Table 17), the set of search space sets monitored by the terminal at each point in time may vary. For example, if search space set #1 is configured with an X-slot period and search space set #2 is configured with a Y-slot period and X and Y are different, the terminal may monitor both search space set #1 and search space set #2 in a specific slot, and monitor either search space set #1 or search space set #2 in a specific slot.

[0220] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting the one with the higher priority according to a predetermined priority rule and performing the corresponding action, or omitting or dropping the action for the one with the lower priority. Furthermore, the contents of the present disclosure are applicable to FDD and TDD systems.

[0221] In the following disclosure, the examples are described through a number of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0222] In describing the present disclosure below, the term "upper layer signaling" may refer to a signaling corresponding to at least one or a combination of at least one of the following signalings.

[0223] - MIB

[0224] - SIB or SIB

[0225] - RRC

[0226] - MAC CE (medium access control control element)

[0227] In addition, L1 signaling may be a signaling corresponding to at least one or a combination of at least one of the following physical layer channels or signaling methods using signaling.

[0228] - PDCCH

[0229] - DCI

[0230] - Terminal-specific (UE-specific) DCI

[0231] - Group Common DCI

[0232] - Common DCI

[0233] - Scheduling DCI (e.g., DCI used for the purpose of scheduling downlink or uplink data)

[0234] - Non-scheduling DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0235] - PUCCH

[0236] - UCI (uplink control information)

[0237] The term "slot" used in the present disclosure below is a general term that may refer to a specific time unit corresponding to a TTI (transmit time interval), and specifically, it may refer to a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system. Below, the transmission and reception of a CSI-RS resource may be understood as the transmission and reception of a CSI-RS corresponding to the CSI-RS resource.

[0238] In the following disclosure, the examples are described through a number of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0239] In future advanced wireless communication systems, base stations and terminals may operate in a band with a higher center frequency called FR3 (e.g., a frequency band between 7 GHz and 24 GHz). In such cases, the coverage (referring to the distance over which effective wireless communication is possible between a terminal and a base station) considered to support a terminal at a specific base station may be reduced. To address this, transmission and reception methods based on different waveforms used in the uplink may also be introduced in the downlink. For the downlink, CP-OFDM and DFTS-OFDM considered in the uplink may be used, as well as OTFS (orthogonal time-frequency spreading) waveforms, which can achieve better performance when the terminal moves at high speeds. The terminal may operate based on CP-OFDM for the downlink signal, or it may also operate using the aforementioned DFTS-OFDM or OTFS.

[0240] At this time, regarding which waveform the terminal will use to receive each downlink channel or signal, the terminal may be notified by the base station through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, or may follow matters fixedly defined in the standard. For example, the terminal may always assume a CP-OFDM waveform when receiving an SSB. As another example, when receiving a PDSCH, the terminal may be instructed to choose one of at least one combination of CP-OFDM, DFTS-OFDM, and OTFS waveforms. The terminal may report to the base station, through a terminal capability report, whether reception of downlink channels and signals is possible based on waveforms other than CP-OFDM. Based on this, the base station may perform transmission to the terminal based on one or more different waveforms during downlink transmission.

[0241] As described above, if the terminal's capabilities are supported, the terminal may be notified of one or more different waveforms from the base station through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, or, if fixedly defined in the standard, receive downlink channels and signals based on one or more different waveforms. In this case, the terminal receives CSI-RS when calculating channel state information between the terminal and the base station, and if the terminal's capabilities and the base station are supported, the waveform of the CSI-RS may also be based on one of at least one combination of CP-OFDM, DFTS-OFDM, and OTFS. Based on this, the terminal may report CSIs to the base station that take into account the different downlink waveforms.

[0242] The terminal may consider at least one combination of the following items regarding CSI resource setting methods that can be considered when reporting CSI.

[0243] [Method 1-0]

[0244] The terminal can perform CSI reporting considering CP-OFDM waveforms. At this time, the terminal can expect not to receive CSI-RS with other waveforms applied (e.g., DFTS-OFDM or OTFS, etc.). Therefore, the terminal can expect that there is no upper-layer signaling related to a specific waveform other than CP-OFDM within the CSI resource setting connected to the CSI report configuration, which is upper-layer signaling for CSI reporting, and the terminal can expect that one or more CSI-RS resources are included within one CSI-RS resource set for channel measurement purposes. The one or more CSI-RS resources may be signals based on CP-OFDM waveforms.

[0245] [Method 1-1]

[0246] When a terminal receives a CSI report considering different downlink waveforms, it may receive a set of one CSI-RS resource from a base station via upper layer signaling, and the set of CSI-RS resource may include one or more CSI-RS resources to which different waveforms are applied. For example, the terminal may receive upper layer signaling from a base station such that two CSI-RS resources are included within one set of CSI-RS resources, and it can be assumed that the first CSI-RS resource is received based on CP-OFDM and the second CSI-RS resource is received based on DFTS-OFDM. That is, the terminal can expect that a set of one set of CSI-RS resources may include multiple CSI-RS resources based on different waveforms.

[0247] [Method 1-2]

[0248] In another way, when reporting CSI considering different downlink waveforms, the terminal may receive one or more CSI-RS resource sets from the base station via upper layer signaling, and each CSI-RS resource set may include one or more CSI-RS resources to which the same waveform is applied. For example, the terminal may receive two CSI-RS resource sets, the first CSI-RS resource set may be configured to include one or more CSI-RS resources that can be received based on CP-OFDM, and the second CSI-RS resource set may be configured to include one or more CSI-RS resources that can be received based on DFTS-OFDM. That is, the terminal can assume that one waveform is applied for each CSI-RS resource set, and can expect that the applied waveforms are different between different CSI-RS resource sets.

[0249] The terminal may consider at least one combination of the following items regarding the CSI report setting method that can be considered when reporting CSI.

[0250] [Method 2-1]

[0251] The terminal may report a CSI based on the CSI-RS of the best-performing waveform among the CSI-RS resources received by the terminal. For example, the terminal receives the best-performing CSI-RS resource among one or more CSI-RS resources corresponding to CP-OFDM or DFTS-OFDM, calculates the CSI, and if the CP-OFDM-based CSI is the best-performing, the terminal may report the CSI based on the CP-OFDM-based CSI-RS resource.

[0252] If the terminal has received a CSI-RS resource based on the above [Method 1-1], the terminal may select one of one or more CSI-RS resources that can be received based on different waveforms within a single CSI-RS resource set and include information indicating the CSI-RS resource in the CSI report. Since the base station can know the corresponding waveform when the index of a specific CSI-RS resource is included in the CSI report, the terminal can determine which waveform-based CSI has the best performance without additionally including information about the waveform in the CSI report. Therefore, the terminal may report the corresponding CSI to the base station by including the CRI (CSI-RS resource indicator) and information such as the corresponding CQI, PMI, and RI. Alternatively and / or the terminal may perform a CSI report corresponding to one or more CSI-RS resources through additional upper-layer signaling from the base station. For example, the terminal may receive a maximum number of CRIs that can be included in the CSI report from the base station as an upper-layer signaling. Through this, if the maximum number of CRIs set by the terminal from the base station is N, the terminal may include up to N CRIs and information such as CQI, PMI, and RI corresponding to each CRI. In this case, the maximum number of CRIs may refer to the maximum number of CRIs considering CSI-RS resources having the same waveform, or it may refer to the maximum number of CRIs that can be counted by including one or more CSI-RS resources having different waveforms. That is, one or more reported CRIs may indicate only CSI-RS resources having the same waveform, or may indicate a specific number of CSI-RS resources regardless of waveform.The terminal can include the CSI (or CSI bit sequence) from the CSI of the CSI-RS resource with the best performance.

[0253] If the terminal has received a CSI-RS resource based on the above [Method 1-2], the terminal may select one of one or more CSI-RS resources that can be received based on different waveforms for each of one or more CSI-RS resource sets, and include information indicating the CSI-RS resource set and / or CSI-RS resource in the CSI report. The terminal may notify the base station of which waveform has the best performance by including the index of the CSI-RS resource set in the CSI report. If the CSI-RS resource set contains multiple CSI-RS resources, the terminal may also report the index of one CSI-RS resource to notify the base station of which of the multiple CSI-RS resources has the best performance. Or / and the terminal may perform a CSI report corresponding to one or more CSI-RS resources through additional upper layer signaling from the base station. For example, the terminal may receive from the base station the maximum number of CRIs that can be included in the CSI report as an upper layer signaling. Through this, if the maximum number of CRIs set by the terminal from the base station is N, the terminal can include up to N CRIs and information such as CQI, PMI, and RI corresponding to each CRI. At this time, the maximum number of CRIs may mean the maximum number of CRIs within a specific CSI-RS resource set, or the maximum number of CRIs that can be counted across one or more CSI-RS resource sets.When one or more CRIs indicate CSI-RS resources within a specific CSI-RS resource set, the CSI report may include indices of CSI-RS resource(s), and said CSI-RS resource(s) may correspond to the same waveform. For example, when a terminal configures a CSI containing one or more CRIs, it may include CRI, RI, LI, PMI, and CQI in the order of CRI, RI, LI, PMI, and CQI in the CSI when reporting on at least one combination of RI, LI, PMI, and CQI calculated based on a specific CRI, and subsequently include them in the same order in the CSI when reporting on at least one combination of RI, LI, PMI, and CQI calculated based on another CRI. When one or more CRIs indicate CSI-RS resources within multiple CSI-RS resource sets, the CSI report may include indices of CSI-RS resource(s), and said CSI-RS resource(s) may correspond to different waveforms. In this case, it is also possible to include the index of the CSI-RS resource set within the CSI report. In such a case, in addition to the aforementioned order of CRI, RI, LI, PMI, and CQI, CRSI (CSI-RS resource set indicator), which can represent the index of the CSI-RS resource set, may be included at the very beginning (i.e., the terminal may include CRSI, CRI, RI, LI, PMI, and CQI in the order within the CSI).Alternatively, the terminal may use a method in which, when configuring CSI, it does not include CRSI, but includes RI, LI, PMI, and CQI corresponding to CRI in the CSI-RS resource set having the smallest index value among the CSI-RS resource sets, and includes RI, LI, PMI, and CQI corresponding to CRI in the CSI-RS resource set having the next smallest index value.

[0254] At this time, the terminal can include the CSI (or CSI bit sequence) starting from the CSI of the CSI-RS resource (in the CSI-RS resource set) that has the best performance.

[0255] [Method 2-2]

[0256] The terminal can generate and report each CSI to the base station for each CSI-RS resource corresponding to different waveforms that the terminal has set as a CSI resource setting. For example, if the terminal has set a CSI-RS resource and a CSI-RS resource set corresponding to three different waveforms, the terminal can generate and report each CSI for the three waveforms.

[0257] If the terminal has received a CSI-RS resource based on the above [Method 1-1], the terminal may select one CSI-RS resource for each waveform among one or more CSI-RS resources that can be received based on different waveforms within one CSI-RS resource set, and report a CSI including CQI, PMI, and RI information corresponding to the CRI indicating each CSI-RS resource to the base station. For example, if there are two CSI-RS resources that can be received based on CP-OFDM and two CSI-RS resources that can be received based on DFTS-OFDM within the CSI-RS resource set configured by the terminal, the terminal may select one of the two CSI-RS resources that can be received based on CP-OFDM and calculate the corresponding CRI, CQI, PMI, and RI, and select one of the two CSI-RS resources that can be received based on DFTS-OFDM and calculate the corresponding CRI, CQI, PMI, and RI to generate a single CSI and report it to the base station. Or / and the terminal may perform CSI reporting corresponding to one or more CSI-RS resources for each waveform through additional upper layer signaling from the base station. For example, when reporting CSI from the base station, the terminal may receive the maximum number of CRIs that can be included within the corresponding CSI for each waveform as a setting through upper layer signaling. Through this, if the maximum number of CRIs that the terminal can report per waveform is set to N from the base station through upper layer signaling, the terminal can include up to N CRIs per waveform and information such as CQI, PMI, and RI corresponding to each CRI.

[0258] If the terminal has received a CSI-RS resource based on the above [Method 1-2], the terminal may select one of the one or more CSI-RS resources for each of the one or more CSI-RS resource sets and include it in the CSI report. That is, by reporting a CSI corresponding to one CSI-RS resource for each CSI-RS resource set, the terminal can report the CSI corresponding to each waveform to the base station.

[0259] At this time, the terminal may not include the index of the CSI-RS resource set in the CSI report, and when reporting the CSI corresponding to each waveform, the terminal may map the index of the CSI-RS resource set in ascending order to the CSI (or CSI bit sequence). For example, assume that the terminal has been configured with three CSI-RS resource sets, and there are two CSI-RS resources in the first CSI-RS resource set and said two CSI-RS resources can be received based on CP-OFDM, there are two CSI-RS resources in the second CSI-RS resource set and said two CSI-RS resources can be received based on DFTS-OFDM, and there are two CSI-RS resources in the third CSI-RS resource set and said two CSI-RS resources can be received based on OTFS. At this time, when generating CSI, the terminal can select one of two CSI-RS resources within the first CSI-RS resource set to represent it as CRI and include the corresponding CQI, PMI, and RI in the CSI report. Subsequently, the terminal can select one of two CSI-RS resources within the second CSI-RS resource set to represent it as CRI and include the corresponding CQI, PMI, and RI in the CSI report, and similarly, can perform a similar operation for the third CSI-RS resource set. That is, the terminal only configures the CSI in the order of the CSI-RS resource set and, by not including the index of the CSI-RS resource set, may not include information on which waveform has the best performance.

[0260] Another method may be to organize the CSI report starting from the CSI for the waveform with the best performance, including the index of the CSI-RS resource set. For example, if the CSI measured by the terminal based on the CSI-RS resources in the third CSI-RS resource set, the first CSI-RS resource set, and the second CSI-RS resource set shows good performance in that order, the terminal may calculate and place the index, CRI, CQI, PMI, RI, etc. for the third CSI-RS resource set, and then calculate and place the CSI for the first CSI-RS resource set and the second CSI-RS resource set in that order.

[0261] Or / and the terminal may perform CSI reporting corresponding to one or more CSI-RS resources for each CSI-RS resource set through additional upper-layer signaling from the base station. For example, the terminal may receive a setting from the base station via upper-layer signaling for the maximum number of CRIs per CSI-RS resource set that can be included in the CSI report. The set maximum number of CRIs may differ for each CSI-RS resource set or may be the same for each CSI-RS resource set. Thus, if the value set by the base station for the maximum number of CRIs that the terminal can report for each CSI-RS resource set is N, the terminal may include up to N CRIs for each CSI-RS resource set and information such as CQI, PMI, and RI corresponding to each CRI. At this time, when the terminal reports at least one combination of RI, LI, PMI, and CQI calculated based on a specific CRI, it may include them in the order of CRI, RI, LI, PMI, and CQI within the CSI, and subsequently, when reporting at least one combination of RI, LI, PMI, and CQI calculated based on another CRI, it may include them in the same order within the CSI. Additionally, the terminal may include a CRSI within the CSI to convey to the base station which CRI represents the CSI-RS corresponding to which CSI-RS resource set. For example, when the terminal configures a CSI containing N CRIs within M CSI-RS resource sets, the terminal may first include a specific CRSI, and then include at least one combination of RI, LI, PMI, and CQI calculated to correspond to each of the N CRIs included in the CSI-RS resource set within the CSI.In addition, the terminal may include at least one combination of RI, LI, PMI, and CQI, which are calculated to correspond to each of the N CRIs in another CSI-RS resource set, within the CSI, and may construct a total of M CSIs corresponding to the CSI-RS resource sets in this order. That is, the terminal first includes a first CRSI within the CSI, and then includes the first CRI, RI, LI, PMI, CQI, the second CRI, RI, LI, PMI, CQI, ... the Nth CRI, RI, LI, PMI, CQI, which are information corresponding to the N CRIs in the CSI-RS resource set corresponding to the first CRSI, within the CSI, and may construct a total of M CRSIs and information corresponding to the N CRIs in the CSI-RS resource set corresponding to each CRSI in this order.

[0262] Additionally, depending on the setting value of timeRestrictionForChannelMeasurements, a parameter that sets a limit on reference signal measurement in the time dimension within the upper layer signaling CSI-ReportConfig, the terminal can determine whether to calculate the CSI by measuring only the most recent reception location prior to the CSI reference resource among the channel state information measurement reference signals within the CSI-ResourceConfig connected to the CSI-ReportConfig, or to calculate the CSI by measuring one or more reception locations prior to the CSI reference resource.

[0263] - If the terminal receives the upper layer signaling timeRestrictionForChannelMeasurements as notConfigured within the CSI-ReportConfig connected to the periodic and semi-continuous CSI-RS resource, the terminal can calculate the CSI based on the receiving location existing prior to the CSI reference resource for each CSI-RS resource, and there are no specification restrictions on how many receiving locations the CSI is calculated based on.

[0264] - If the terminal has timeRestrictionForChannelMeasurements, a higher-layer signaling, set to 'configured' within the CSI-ReportConfig connected to periodic and semi-continuous CSI-RS resources, the terminal can calculate the CSI based on the most recent received location among the received locations existing prior to the CSI reference resource for each CSI-RS resource.

[0265] As described above, the terminal can receive and measure individual CSI-RS with different waveforms applied, calculate the CSI, and report it to the base station. In this case, if the base station operates periodic or semi-continuous CSI-RS, the overhead of the CSI-RS transmitted by the base station increases twofold depending on the number of different waveforms considered by the base station. For example, if the base station operates CP-OFDM-based and DFTS-OFDM-based CSI-RS to improve coverage, it may consume twice the CSI-RS overhead compared to a situation where only CP-OFDM-based CSI-RS is operated.

[0266] Therefore, to prevent such an increase in overhead, the terminal may report a CSI based on a different waveform by receiving a periodic or semi-continuous CSI-RS without explicit notification from the base station that a specific waveform has been applied (i.e., one or more waveforms may be applied to a single CSI-RS resource, and different waveforms may be applied for each reception occasion), and then receiving the aforementioned upper layer signaling, timeRestrictionForChannelMeasurements, as configured, and then receiving additional notification of a waveform from the base station through a combination of at least one of the upper layer signaling, MAC-CE signaling, and L1 signaling.

[0267] [Method 3-0]

[0268] If the terminal receives timeRestrictionForChannelMeasurements, which is an upper-layer signaling within the CSI-ReportConfig connected to the periodic and semi-continuous CSI-RS resource, set to configured, it can calculate the CSI based on the most recent reception location among the reception locations existing prior to the CSI reference resource of the CSI-RS. If there is one or more CSI-RS connected to the CSI-ReportConfig, the terminal can perform the operation described above for each CSI-RS resource corresponding to each CSI-RS. That is, for each CSI-RS resource, the terminal can measure the channel based on the most recent reception location among the reception locations existing prior to the CSI reference resource and calculate the CSI based thereon. At this time, the terminal can consider that for each reception location of one or more CSI-RS resources connected to the CSI-ReportConfig, the said CSI-RS resource is received based on CP-OFDM. That is, the terminal can calculate CSI based on upper layer signaling set in CSI-ReportConfig (e.g., reportQuantity, wideband or subband PMI, wideband or subband CQI, RI restriction, etc.) based solely on CP-OFDM-based CSI-RS reception and measured channels, without considering waveforms other than CP-OFDM.

[0269] As described above, the terminal can calculate the CSI based on the channel that received and measured the CSI-RS at the most recent receiving location prior to the CSI reference resource, and the terminal can assume that the base station at that receiving location may perform specific precoding or preprocessing on the CSI-RS transmitted at that receiving location, in addition to the assumption regarding the CP-OFDM waveform. That is, although the terminal is not explicitly notified of what precoding or preprocessing is performed, by receiving the timeRestrictionForChannelMeasurement set to configured from the base station, the terminal can assume that there is a possibility that the base station may perform special precoding or preprocessing at a specific receiving location of the CSI-RS connected to CSI-ReportConfig compared to other receiving locations.

[0270] When this method is applied, the terminal receives CP-OFDM-based CSI-RS, calculates the CSI, and reports it to the base station. Since the terminal does not assume any other waveforms, it can be assumed that the CSI reported by the terminal to the base station is based only on the CP-OFDM waveform fixedly defined in the standard, rather than assuming a waveform selected by the terminal or specially set by the base station.

[0271] [Method 3-1]

[0272] If the terminal receives timeRestrictionForChannelMeasurements, an upper-layer signaling, as configured within the CSI-ReportConfig connected to the periodic and semi-continuous CSI-RS resource, it can calculate the CSI based on the single most recent reception location among the reception locations existing prior to the CSI-RS's CSI reference resource. If there is one or more CSI-RS connected to the CSI-ReportConfig, the terminal can perform the above-described operation for each CSI-RS resource corresponding to each CSI-RS. That is, for each CSI-RS resource, the terminal can measure the channel based on the most recent reception location among the reception locations existing prior to the CSI reference resource and calculate the CSI based thereon.

[0273] The terminal can be notified of which waveform is applied to the CSI-RS to be received at the most recent receiving location among the receiving locations existing prior to the CSI reference resource from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling.

[0274] - For example, the terminal may receive a setting via upper layer signaling regarding whether CP-OFDM is applied to the CSI-RS to be received from the base station at the receiving location. The upper layer signaling may be set within CSI-ReportConfig or within CSI-ResourceConfig, and in the case of non-periodic CSI reporting, it may be set under one or more upper layer signalings that constitute the code point of the CSI request field within the DCI.

[0275] - For example, the terminal may receive information from the base station regarding which waveform is applied to the CSI-RS to be received at the aforementioned receiving location, set as upper layer signaling for all applicable waveforms, and subsequently, the terminal may receive additional notification from the base station that one of these waveforms is ultimately applied. Through this additional notification, the terminal can assume the waveform ultimately applied at the most recent receiving location prior to the CSI reference resource. For example, the terminal may receive information from the base station set as upper layer signaling that three waveforms, such as CP-OFDM, DFTS-OFDM, and OTFS, can be applied to the CSI-RS, and subsequently, the terminal may receive additional notification from the base station that among these three waveforms, DFTS-OFDM is applied to the CSI-RS and received. The above additional notification may be provided from the base station to the terminal through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling.

[0276] Through the methods described above, the terminal can estimate the channel between the base station and the terminal based on the assumption that a waveform is applied at the most recent CSI-RS reception location prior to the CSI reference resource, and thereby calculate the CSI and report it to the base station. At this time, since the terminal and the base station already have a common understanding of which waveform is applied at the reception location, the terminal may not include information about the waveform when generating the CSI through the above process, and may generate the CSI by assuming a specific waveform that the base station and the terminal have a common understanding of and report it to the base station.

[0277] [Method 3-2]

[0278] If the terminal receives timeRestrictionForChannelMeasurements, an upper-layer signaling, as configured within the CSI-ReportConfig connected to the periodic and semi-continuous CSI-RS resource, it can calculate the CSI based on the X most recent reception locations among the reception locations existing prior to the CSI-RS's CSI reference resource. If there is one or more CSI-RS connected to the CSI-ReportConfig, the terminal can perform the above-described operation for each CSI-RS resource corresponding to each CSI-RS. That is, for each CSI-RS resource, the terminal can measure the channel based on the X most recent reception locations among the reception locations existing prior to the CSI reference resource and calculate the CSI based on this. At this time, X can be expressed as X = N x W (i.e., X can be expressed as the product of N and W), where W represents the number of different waveforms to consider when the terminal estimates the channel, and N represents the number of receiving locations where the terminal measures the channel based on the CSI-RS corresponding to a specific CSI-RS resource for each different waveform.

[0279] The terminal may be notified of the above N and W through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling from the base station, or may follow matters fixedly defined in the standard.

[0280] - The terminal can assume that N is fixedly defined as 1 in the standard. Additionally, the terminal can expect to be notified of at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling from the base station as a natural number greater than or equal to 1 for the value of N. When N is 1, the terminal can measure the CSI-RS only for the most recent reception location (corresponding to a specific waveform) prior to the CSI reference resource, calculate the CSI, and report it. For example, if N=1 and W=2, the terminal can measure the CSI-RS for the most recent reception location prior to the CSI reference resource corresponding to the first waveform and the most recent reception location prior to the CSI reference resource corresponding to the second waveform, calculate the CSI, and report it to the base station. If N is a natural number greater than 1, the terminal may calculate and report the CSI by measuring the most recent N reception locations (corresponding to a specific waveform) prior to the CSI reference resource for the CSI-RS, and how the measurements for the N reception locations are performed may vary depending on the terminal implementation.

[0281] - For example, the terminal can be expected to be set to a natural number greater than or equal to 1 for W.

[0282] ■ If W is 1, the terminal may assume one of CP-OFDM, DFTS-OFDM, or OTFS waveforms when receiving CSI-RS at the most recent first receiving location prior to the CSI reference resource, and for one of the waveforms, the terminal may be notified by the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, or may follow fixedly defined specifications in the standard. In this case, if N > 1, the terminal may measure CSI-RS at N receiving locations corresponding to waveforms identical to the assumed waveform.

[0283] ■ If W is 2, the terminal can calculate the CSI based on the most recent first and second reception locations prior to the CSI reference resource. In this case, the terminal can expect the CSI-RS to be received based on specific waveforms (different) at the most recent first and second reception locations prior to the CSI reference resource. For example, for each CSI-RS resource, the terminal can expect the CSI-RS to be received fixedly with CP-OFDM and DFTS-OFDM waveforms, respectively, at the most recent first and second reception locations prior to the CSI reference resource. Alternatively, the terminal can be notified by the base station of which waveform the CSI-RS is received based on at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling. For example, the terminal may expect to receive CSI-RS based on a first waveform and a second waveform, respectively, when receiving at the most recent first and second receiving locations prior to the CSI reference resource, and said first and second waveforms may be set, for example, through upper layer signaling. To consider each waveform, the terminal measures the CSI-RS of N receiving locations corresponding to each waveform. For example, if the terminal considers two waveforms when estimating a channel, the terminal considers the CSI-RS of N receiving locations corresponding to the first waveform of a single CSI-RS resource and the CSI-RS of N receiving locations corresponding to the second waveform.

[0284] ■ Similar to the above, the terminal can operate similarly for W values ​​corresponding to natural numbers greater than or equal to 3.

[0285] As described above, for a single CSI-RS resource, the terminal can estimate the channel through a total of X reception locations by considering N reception locations prior to the CSI reference resource for each of W different waveforms, and report the CSI based on this. If multiple CSI-RS resources are connected to CSI-ReportConfig, the terminal can perform the same operation for each CSI-RS resource.

[0286] As an example, the terminal can calculate a CSI for each waveform to generate a single CSI and report it to the base station. If W = 2 and N = 1, the terminal can calculate a CSI corresponding to the first waveform (e.g., may include CQI, PMI, RI), calculate a CSI corresponding to the second waveform (e.g., may include CQI, PMI, RI), and configure the CSI so that the base station can determine that it is a CSI corresponding to the first waveform and the second waveform, and report it to the base station. For example, when generating the CSI, the terminal may first include CSI information calculated based on the first waveform considered at the most recent first reception location prior to the CSI reference resource, and then include CSI information calculated based on the second waveform considered at the most recent second reception location prior to the CSI reference resource.

[0287] As an example, the terminal can calculate the CSI for each waveform, select the CSI for the waveform with the best performance among one or more waveforms based on the terminal's judgment, and report only the CSI corresponding to the selected waveform to the base station. In this case, the terminal can report to the base station by including information about which waveform was selected within the CSI.

[0288] In the case of [Method 3-1] and / or [Method 3-2] described above, the base station may be able to instruct multiple terminals to report CSI simultaneously via group Common DCI to trigger CSI reporting to one or more terminals simultaneously. This is because, in the case of periodic or semi-continuous CSI-RS, the base station can set the same CSI-RS to multiple terminals. Therefore, if the base station applies a specific waveform to a specific receiving location of such CSI-RS and transmits it, one or more terminals that have been set to the same CSI-RS may receive the CSI-RS with the specific waveform applied at that receiving location, thereby enabling an operation that affects multiple terminals. Accordingly, to have multiple terminals perform such CSI reporting simultaneously, the base station may instruct CSI reporting by transmitting the same information to multiple terminals via group Common DCI.

[0289] At least one combination of [Method 3-0] to [Method 3-2] described above may be applicable to all periodic, semi-continuous, and non-periodic CSI reporting methods of the terminal. If the terminal applies at least one combination of [Method 3-0] to [Method 3-2] described above to a periodic or semi-continuous CSI reporting method, the terminal may update one or more waveforms previously notified to be applied to CSI reporting to other waveforms through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling from the base station so as to be able to report CSI for a specific waveform.

[0290] To support the above-described [Method 3-1] and / or [Method 3-2], that is, to perform CSI reporting considering one or more different waveforms, the terminal may receive different upper-layer signalings for each different waveform within the upper-layer signaling CSI-ReportConfig. For example, the terminal may individually receive upper-layer signalings such as reportQuantity, reportFreqConfiguration, cqi-FormatIndicator, pmi-FormatIndicator, csi-ReportingBand, cqi-Table, subbandSize, codebookConfig, and reportSlotOffsetList for each different waveform within the CSI-ReportConfig. If the terminal receives different values ​​for the upper-layer signaling reportSlotOffsetList for each different waveform, the terminal may determine the slot position for the CSI report based on the largest value among the respective slot offsets corresponding to each waveform, considering one or more waveforms.

[0291] When the terminal reports a CSI based on one or more waveforms, if there is insufficient uplink resources to report the entire CSI, it may exclude some of the CSI and report it to the base station. In this case, to exclude some of the CSI, the terminal may define a priority among the information for each waveform within the CSI. For example, when the terminal reports a CSI for one or more waveforms, it may define the CSI based on the CP-OFDM waveform to have the highest priority.

[0292] The terminal may be notified of at least one combination of [Method 3-0] to [Method 3-2] from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, or may expect that at least one combination of [Method 3-0] to [Method 3-2] is fixedly defined in the standard. Additionally, if the terminal is notified of a combination of one or more specific methods from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, it may mean that the terminal cannot support one or more other specific combinations of methods. For example, if the terminal receives upper layer signaling setting information related to time-dimensional measurement limitations when reporting CSI based on one or more waveforms from the base station, it may expect that [Method 3-0] is fixedly defined in the standard. As another example, the terminal may be notified by the base station regarding [Method 3-2] through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, and in this case, the terminal may be deemed to have been notified by the base station that [Method 3-0] is not supported. Conversely, if the terminal is not notified by the base station regarding at least one combination of [Method 3-1] and [Method 3-2] through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling, the terminal may be deemed to have been notified by the base station to perform CSI reporting with [Method 3-0] as a basic operation.

[0293] The terminal may report to the base station, as a terminal capability, whether it is possible to support at least one combination of [Method 3-0] to [Method 3-2]. In this case, if the terminal reports to the base station, as a terminal capability, that a combination of one or more specific methods is possible, it may be deemed that the terminal has reported that it is not possible to support one or more other specific combinations of methods. For example, the terminal may report to the base station whether it is possible to support [Method 3-0] or [Method 3-2]. As another example, the terminal may report to the base station that it is possible to support [Method 3-0], and such terminal capability reporting may mean that the terminal is not possible to support [Method 3-2]. Terminal capability reporting may be per UE, per cell, per band, per FS (feature set), per FSPC (feature set per component-carrier), and the terminal may report whether it supports each method through individual terminal capabilities, or may report whether it supports at least one combination of multiple methods through one terminal capability.

[0294] FIG. 6 is a diagram showing the operation of a terminal for a multi-waveform-based CSI report according to one embodiment of the present disclosure.

[0295] In step 600, the terminal may report terminal capabilities to the base station. The terminal capabilities that the terminal may report to the base station may be related to terminal capabilities regarding CSI resource and CSI report settings, codebook types supported by the terminal (e.g., Type-I or Type-II), and at least one combination of [Method 1-0] to [Method 1-2], [Method 2-1], [Method 2-2], and [Method 3-0] to [Method 3-2]. Specifically, the terminal capabilities may include waveforms that the terminal can support in downlink reception, CSI-RS waveforms that the terminal can support, CSI-RS waveforms that can serve as the basis for CSI reporting and the number of waveforms, waveforms corresponding to reception locations that can be measured to generate a CSI report and the number of reception locations for each waveform. Step 600 may also be omitted.

[0296] In step 605, the terminal may receive base station signaling from the base station. At this time, the base station signaling may refer to at least one combination of the base station's upper layer signaling, MAC-CE signaling, and L1 signaling, and the upper layer signaling, MAC-CE signaling, and L1 signaling may be for performing at least one combination of [Method 1-0] to [Method 1-2], [Method 2-1], [Method 2-2], and [Method 3-0] to [Method 3-2], and related information for setting up a CSI report (e.g., CSI-ReportConfig and reportQuantity, codebookConfig, etc. within the corresponding parameters). In particular, the terminal may receive setting information for CSI-ReportConfig from the base station, and upper layer signaling related to time-dimensional measurement restrictions (e.g., timeRestrictionForChannelMeasurements) may be included in CSI-ReportConfig.

[0297] In step 610, the terminal may receive a CSI-RS resource that is periodic, semi-continuous, or / and non-periodic from a base station through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and receive the corresponding CSI-RS resource (or CSI-RS corresponding to said CSI-RS resource). Based on the received CSI-RS, the terminal may estimate the downlink channel between the base station and the terminal and calculate the corresponding CSI. In particular, depending on the method the terminal receives from the base station in step 605 for reporting CSI based on multi-waveform-based CSI reporting, the terminal may expect that a specific waveform, such as CP-OFDM, DFTS-OFDM, or OTFS, is applied to the CSI-RS resource at a specific number of the most recent receiving locations prior to the CSI reference resource corresponding to the CSI reporting setting connected to said CSI-RS among the CSI-RS receiving locations.

[0298] In step 615, the terminal may consider conditions regarding how the terminal will determine when calculating the CSI based on the terminal capability reported to the base station or / and matters notified from the base station through at least one combination of upper layer signaling, MAC-CE signaling, and L1 signaling in order to perform multi-waveform-based CSI reporting. If the terminal is notified by the base station to perform multi-waveform-based CSI reporting according to the time dimension measurement limit setting, the terminal may generate a CSI report using the first CSI reporting method and report the CSI to the base station (620). Otherwise, the terminal may generate a CSI report using the second CSI reporting method and report the CSI to the base station (625).

[0299] When the first CSI reporting method is applied, the terminal may determine a multi-waveform-based CSI calculation and reporting method depending on which one is supported, provided that the terminal is notified of one of [Method 1-1] or [Method 1-2] as an upper-layer signaling setting method for the connected CSI resource setting during CSI calculation through a combination of at least one of upper-layer signaling, MAC-CE signaling, and L1 signaling from the base station, or reported by the terminal as a terminal capability, or is fixedly defined in the specification and supports multi-waveform-based CSI calculation based on a combination of at least one of [Method 3-1] or / and [Method 3-2]. The terminal may generate a CSI according to the determined reporting method and report the generated CSI to the base station. When the second reporting method is applied, the terminal may perform CSI generation based on a single waveform during CSI calculation and report the generated CSI.

[0300] The above-described flowchart illustrates an exemplary method that may be implemented in accordance with the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart in this specification. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0301] FIG. 7 is a diagram illustrating the operation of a base station for multi-waveform-based CSI reporting according to one embodiment of the present disclosure.

[0302] In step 700, the base station may receive terminal capabilities from the terminal. The terminal capabilities that the base station may receive from the terminal may include terminal capabilities related to CSI resource and CSI report settings, codebook types supported by the terminal (e.g., Type-I or Type-II), and combinations of at least one of [Method 1-0] to [Method 1-2], [Method 2-1], [Method 2-2], and [Method 3-0] to [Method 3-2]. Specifically, the terminal capabilities may include waveforms that the terminal can support in downlink reception, CSI-RS waveforms that the terminal can support, CSI-RS waveforms that can serve as the basis for CSI reporting and the number of waveforms, waveforms corresponding to reception locations that can be measured to generate a CSI report and the number of reception locations for each waveform. Step 700 may also be omitted.

[0303] In step 705, the base station may transmit base station signaling to the terminal. At this time, the base station signaling may refer to at least one combination of the base station's upper layer signaling, MAC-CE signaling, and L1 signaling, and the said upper layer signaling, MAC-CE signaling, and L1 signaling may be related information for setting up a CSI report (e.g., CSI-ReportConfig and reportQuantity, codebookConfig, etc. within the said parameters), and at least one combination of the said [Method 1-0] to [Method 1-2], [Method 2-1], [Method 2-2], and [Method 3-0] to [Method 3-2]. In particular, the base station may transmit setting information for the CSI-ReportConfig to the terminal, and a time-dimensional measurement restriction (e.g., timeRestrictionForChannelMeasurements) may be included in the CSI-ReportConfig. In step 710, the base station may transmit to the terminal a periodic, semi-continuous, or / and non-periodic CSI-RS resource to be set, activated, or / and triggered through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and transmit the corresponding CSI-RS resource (or CSI-RS corresponding to said CSI-RS resource). Based on this, the base station may expect the terminal to estimate the downlink channel between the base station and the terminal, and may expect the terminal to calculate and report the CSI corresponding to the received CSI-RS.In particular, depending on whether the base station has received a setting from the base station regarding which method the terminal will report based on when reporting multi-waveform based CSI in step 705, the base station may transmit CSI-RS by applying a specific waveform, such as CP-OFDM, DFTS-OFDM, or OTFS, to the CSI-RS resource at the most recent specific number of receiving locations prior to the CSI reference resource corresponding to the CSI reporting setting connected to the CSI-RS among the CSI-RS receiving locations at the terminal.

[0304] In step 715, the base station may expect the terminal to perform a CSI report according to one of the first CSI reporting method or the second CSI reporting method according to a method notified to the terminal through a combination of at least one of upper layer signaling, MAC-CE signaling, and L1 signaling, and may receive a CSI report from the terminal accordingly.

[0305] The above-described flowchart illustrates an exemplary method that may be implemented in accordance with the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart in this specification. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0306] FIG. 8 is a drawing illustrating the structure of a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0307] Referring to FIG. 8, the terminal may include a transceiver (referring to a terminal receiver (800) and a terminal transmitter (810)), a memory (not shown), and a terminal processing unit (805, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver (800, 810), memory, and terminal processing unit (805) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. Furthermore, the transceiver, memory, and processor may be implemented in the form of a single chip.

[0308] The transceiver can transmit and receive signals with a base station. Here, the signal may include control information and data. To this end, the transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts its frequency. However, this is merely one embodiment of the transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver.

[0309] In addition, the transceiver receives a signal through a wireless channel and outputs it to a processor, and can transmit the signal output from the processor through a wireless channel.

[0310] Memory can store programs and data necessary for the operation of the terminal. Additionally, memory can store control information or data included in signals transmitted and received by the terminal. Memory may be composed of storage media or combinations of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memories.

[0311] In addition, the processor can control a series of processes to enable the terminal to operate according to the aforementioned embodiment. For example, the processor can receive a DCI composed of two layers and control the components of the terminal to receive multiple PDSCHs simultaneously. There may be multiple processors, and the processors can perform the operation of controlling the components of the terminal by executing a program stored in memory.

[0312] FIG. 9 is a drawing illustrating the structure of a base station in a wireless communication system according to one embodiment of the present disclosure.

[0313] Referring to FIG. 9, the base station may include a transceiver unit, which refers to a base station receiver (900) and a base station transmitter (910), a memory (not shown), and a base station processing unit (905, or a base station control unit or processor). Depending on the communication method of the base station described above, the transceiver unit (900, 910), the memory, and the base station processing unit (905) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more components or fewer components than the components described above. In addition, the transceiver unit, the memory, and the processor may be implemented in the form of a single chip.

[0314] The transceiver can transmit and receive signals with a terminal. Here, the signal may include control information and data. To this end, the transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts its frequency. However, this is merely one embodiment of the transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver.

[0315] In addition, the transceiver receives a signal through a wireless channel and outputs it to a processor, and can transmit the signal output from the processor through a wireless channel.

[0316] Memory can store programs and data necessary for the operation of the base station. Additionally, memory can store control information or data included in signals transmitted and received by the base station. Memory can be composed of storage media or combinations of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memories.

[0317] A processor can control a series of processes to enable a base station to operate according to the embodiments of the present disclosure described above. For example, the processor can control each component of the base station to configure two layers of DCIs containing allocation information for a plurality of PDSCHs and to transmit them. There may be multiple processors, and the processors can perform control operations on the components of the base station by executing a program stored in memory.

[0318] Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0319] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to the claims or embodiments described in the specification of this disclosure.

[0320] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disc storage devices, compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0321] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the internet, intranet, LAN (local area network), WLAN (wide LAN), or SAN (storage area network), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present disclosure.

[0322] In the specific embodiments of the present disclosure described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0323] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, a base station and a terminal may be operated by combining parts of one embodiment of the present disclosure with parts of another embodiment. For example, a base station and a terminal may be operated by combining parts of the first embodiment and the second embodiment of the present disclosure. In addition, although the above embodiments are presented based on an FDD LTE system, other variations based on the technical concept of the above embodiments may be implemented in other systems such as TDD LTE systems, 5G or NR systems.

[0324] Meanwhile, the order of description in the drawings illustrating the method of the present invention does not necessarily correspond to the order of execution, and the order of execution may be changed or executed in parallel.

[0325] Alternatively, drawings describing the method of the present invention may omit some components and include only some components to the extent that the essence of the present invention is not impaired.

[0326] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not impair the essence of the invention.

[0327] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only and is not limited to the embodiments disclosed. Those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present disclosure. The scope of the present disclosure is defined by the claims set forth below rather than by the foregoing detailed description, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included within the scope of the present disclosure.

Claims

1. In a method performed by a terminal of a communication system, A step of receiving configuration information for a channel state information (CSI) report from a base station, wherein the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension; A step of receiving CSI-RS configuration information from the base station; A step of receiving a plurality of CSI-RS from the base station; A step of generating a CSI based on a CSI-RS received at one or more of the received CSI-RS reception locations (occasions); and The method includes the step of transmitting the CSI report containing the CSI to the base station, A method characterized by receiving a CSI-RS with one or more waveforms applied at one or more of the above-mentioned CSI-RS receiving locations.

2. In Paragraph 1, A method characterized by receiving from the base station information indicating one or more waveforms applied to the CSI-RS received at one or more CSI-RS receiving locations.

3. In Paragraph 1, A method characterized in that the number of one or more CSI-RS reception locations is the product of the number of different waveforms to be considered by the terminal when estimating channels based on the CSI-RS and the number of reception locations to be measured for each waveform.

4. In Paragraph 1, A method characterized by the above CSI report including CSIs corresponding to one or more waveforms, or including only CSIs for waveforms with good performance and including information indicating which waveform the CSI is for.

5. In the method performed by a base station of a communication system, A step of transmitting configuration information for a channel state information (CSI) report to a terminal, wherein the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension; A step of transmitting CSI-RS configuration information to the above terminal; and A step of transmitting a plurality of CSI-RS to the above terminal; and The method includes the step of receiving the CSI report containing the CSI from the terminal, The above CSI is based on a CSI-RS transmitted at one or more of the received CSI-RS reception locations (occasions), and A method characterized by transmitting a CSI-RS with one or more waveforms applied at one or more of the above-mentioned CSI-RS receiving locations.

6. In Paragraph 5, A method characterized by transmitting information indicating one or more waveforms applied to the CSI-RS received at one or more CSI-RS receiving locations to the terminal.

7. In Paragraph 5, A method characterized in that the number of one or more CSI-RS reception locations is the product of the number of different waveforms to be considered by the terminal when estimating channels based on the CSI-RS and the number of reception locations to be measured for each waveform.

8. In Paragraph 5, A method characterized by the above CSI report including CSIs corresponding to one or more waveforms, or including only CSIs for waveforms with good performance and including information indicating which waveform the CSI is for.

9. In a method performed by a terminal of a communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the terminal: Receives configuration information for a channel state information (CSI) report from a base station, and the configuration information for the CSI report includes a parameter that sets a limit on the measurement of a CSI-RS (channel state information reference signal) for CSI generation in a time dimension. Receive CSI-RS configuration information from the above base station, and Receives a plurality of CSI-RS from the above base station, and Generates a CSI based on a CSI-RS received at one or more of the above-mentioned CSI-RS reception locations (occasions), and A memory storing a command to transmit the CSI report including the CSI to the base station; and A terminal characterized by receiving a CSI-RS with one or more waveforms applied at one or more of the above-mentioned CSI-RS receiving locations.

10. In Paragraph 9, A terminal characterized by receiving from the base station information indicating one or more waveforms applied to the CSI-RS received at one or more CSI-RS receiving locations.

11. In Paragraph 9, A terminal characterized in that the number of one or more CSI-RS reception locations is the product of the number of different waveforms to be considered when the terminal estimates the channel based on the CSI-RS and the number of reception locations to be measured for each waveform.

12. In Paragraph 9, A terminal characterized by the above CSI report including CSIs corresponding to one or more waveforms, or including only CSIs for waveforms with good performance, and including information indicating which waveform the CSI corresponds to.

13. In a method performed by a base station of a communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the base station: The terminal transmits configuration information for channel state information (CSI) reporting, and the configuration information for CSI reporting includes a parameter that sets a limit on the measurement of CSI-RS (channel state information reference signal) for CSI generation in a time dimension. Transmit CSI-RS configuration information to the above terminal, and Transmitting a plurality of CSI-RS to the above terminal, and A memory storing a command to receive the CSI report including the CSI from the terminal; and The above CSI is based on a CSI-RS transmitted at one or more of the received CSI-RS reception locations (occasions), and A base station characterized by transmitting CSI-RS with one or more waveforms applied at one or more of the above-mentioned CSI-RS receiving locations.

14. In Paragraph 13, A base station characterized by transmitting information indicating one or more waveforms applied to the CSI-RS received at one or more CSI-RS receiving locations to the terminal.

15. In Paragraph 13, The number of one or more CSI-RS reception locations mentioned above corresponds to the product of the number of different waveforms to be considered by the terminal when estimating channels based on the CSI-RS and the number of reception locations to be measured for each waveform, and A base station characterized by the above CSI report including CSIs corresponding to one or more waveforms, or including only CSIs for waveforms with good performance and information indicating which waveform the CSI corresponds to.

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