Method and device for compressing CSI-RS on basis of artificial intelligence model transmission in wireless communication system

Abstract

The present disclosure relates to a 5G-A or 6G communication system for supporting a data transmission rate higher than that of 5G NR. In addition, the disclosure provides a method and a device for compressing and transmitting a channel state information-reference signal (CSI-RS) on the basis of artificial intelligence (AI) model transmission in order to reduce CSI-RS overhead in a mobile communication system.

Description

Artificial Intelligence Model Transmission-Based CSI-RS Compression Method and Device in Wireless Communication Systems

[0001] The present disclosure relates to a wireless communication system, and more specifically to an artificial intelligence model transmission-based CSI-RS compression method and apparatus in a wireless communication system.

[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 such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of 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, 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 to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; 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 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 present disclosure provides a method and apparatus for reducing CSI-RS (channel state information-reference signal) overhead through CSI-RS compression using an artificial intelligence (AI) model transmitted from a base station to a terminal in a wireless communication system.

[0009] The technical problems to be solved by the present disclosure are not limited to those mentioned above, and other unmentioned technical problems may be considered by those skilled in the art from the various embodiments of the present disclosure described below.

[0010] The present disclosure relates to a method performed by a terminal (user equipment, UE) in a wireless communication system, comprising: receiving an artificial intelligence model for compressing a channel state information-reference signal (CSI-RS) from a base station; receiving information regarding the transmitted artificial intelligence model for compressing the channel state information-reference signal; restoring a compressed channel state information-reference signal port channel transmitted from the base station to an entire channel state information-reference signal port channel based on the information related to the artificial intelligence model for compressing the channel state information-reference signal and the channel state information-reference signal; and feeding back channel state information of the channel for the restored entire channel state information-reference signal port to the base station.

[0011] A method for a base station to compress and transmit / receive a channel state information reference signal to a terminal in a wireless communication system according to one embodiment of the present disclosure comprises: a step in which the base station transmits an AI model for compressing the channel state information reference signal to the terminal; a step in which input and output configuration information for the transmitted AI model is transmitted; and a method characterized by receiving and obtaining channel state information for an entire channel state information reference signal port from the terminal.

[0012] A method for transmitting and receiving a compressed channel state information reference signal in a wireless communication system according to one embodiment of the present disclosure comprises: the terminal receiving a channel state information reference signal and information related to an AI model for compressing the channel state information reference signal from a base station; measuring the compressed channel state information reference signal transmitted from the base station based on the information; estimating the channel state for a compressed channel state information reference signal port based on the measurement of the compressed channel state information reference signal; obtaining channel state information for the entire channel state information reference signal port based on the channel for the compressed channel state information reference signal port and the information related to the AI ​​model; and feeding back the channel state information for the entire channel state information reference signal port to the base station.

[0013] In addition, a method performed by a terminal in a communication system comprises: receiving configuration information for an artificial intelligence model from a base station, wherein the configuration information includes input and output related information for the artificial intelligence model; receiving compression information related to a channel state information reference signal (CSI-RS) from the base station; receiving a CSI-RS corresponding to a compressed CSI-RS port from the base station; restoring a compressed CSI-RS port channel to a full CSI-RS port channel based on the input and output related information of the artificial intelligence model and the compressed CSI-RS port; and reporting channel state information for the restored full CSI-RS port channel to the base station.

[0014] In addition, a method performed by a base station in a communication system comprises the steps of: transmitting configuration information for an artificial intelligence model to a terminal, wherein the configuration information includes input and output related information for the artificial intelligence model; transmitting compressed information related to a channel state information reference signal (CSI-RS) to the terminal; transmitting a CSI-RS corresponding to a compressed CSI-RS port to the terminal; and receiving channel state information for an entire CSI-RS port channel from the terminal, wherein the entire CSI-RS port channel is restored based on the input and output related information of the artificial intelligence model and the compressed CSI-RS port.

[0015] Additionally, a terminal of a communication system comprises: at least one transceiver; at least one processor connected to the at least one transceiver so as to be able to communicate with the at least one transceiver; and a memory connected to the at least one processor so as to be able 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 an artificial intelligence model from a base station, wherein the configuration information includes input and output related information for the artificial intelligence model; receives compression information related to a channel state information reference signal (CSI-RS) from the base station; receives a CSI-RS corresponding to a compressed CSI-RS port from the base station; restores a compressed CSI-RS port channel to a whole CSI-RS port channel based on the input and output related information for the artificial intelligence model and the compressed CSI-RS port; and stores an instruction to report channel state information for the restored whole CSI-RS port channel to the base station.

[0016] Additionally, a base station of a communication system comprises: at least one transceiver; at least one processor connected to the at least one transceiver so as to be able to communicate with the at least one transceiver; and a memory connected to the at least one processor so as to be able 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 an artificial intelligence model to a terminal, wherein the configuration information includes input and output related information for the artificial intelligence model; transmits compressed information related to a channel state information reference signal (CSI-RS) to the terminal; transmits a CSI-RS corresponding to a compressed CSI-RS port to the terminal; and stores a command to receive channel state information for an entire CSI-RS port channel from the terminal; wherein the entire CSI-RS port channel is restored based on the input and output related information of the artificial intelligence model and the compressed CSI-RS port.

[0017]

[0018]

[0019] The various embodiments of the present disclosure described above are merely some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by those skilled in the art based on the detailed description to be described below.

[0020] According to one embodiment of the present disclosure, a method and apparatus for compressing and transmitting / receiving a channel state information reference signal in a wireless communication system can be provided.

[0021] According to one embodiment of the present disclosure, by compressing and transmitting a channel state information reference signal based on an AI model for CSI-RS compression and related information transmitted by a base station, the wireless resource overhead used for transmitting the channel state information reference signal can be reduced.

[0022] The effects obtainable from the various embodiments of the present disclosure are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art based on the following detailed description.

[0023] 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 wireless communication system.

[0024] Figure 2 is a diagram illustrating an example of a slot structure used in a 5G wireless communication system.

[0025] Figure 3 is a diagram illustrating an example of a configuration for a bandwidth part (BWP) in a 5G wireless communication system.

[0026] Figure 4 is a diagram illustrating an example of a Control Resource Set (CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0027] Figure 5 is a diagram illustrating the structure of a downlink control channel of a 5G wireless communication system.

[0028] Figure 6 is a diagram illustrating an example of a non-periodic CSI reporting method.

[0029] FIG. 7 is a diagram illustrating an example of the concept of AI-based CSI-RS compression to reduce CSI-RS overhead applied to various embodiments of the present disclosure.

[0030] FIG. 8 is a diagram illustrating an example of real number input / output and complex number input / output of an AI model according to one embodiment of the present disclosure.

[0031] FIG. 9a is a diagram illustrating an example of a method for configuring the input and output axes of an AI model for CSI-RS compression applied to various embodiments of the present disclosure.

[0032] FIG. 9b is a diagram illustrating another example of a method for configuring the axes of the input and output of an AI model for CSI-RS compression applied to various embodiments of the present disclosure.

[0033] FIG. 10 is a diagram illustrating an example of the settings for the input and output of an AI model in an AI model transmission-based CSI-RS compression method according to one embodiment of the present disclosure.

[0034] Figure 11 is a diagram illustrating an example of the AI ​​inference process of a quantized AI-based channel restoration model.

[0035] FIG. 12 is a diagram illustrating an example of an AI model transmission-based CSI-RS compression transmission and reception process according to one embodiment of the present disclosure.

[0036] Figure 13a illustrates an example of performing CSI-RS compression using AI model generalization.

[0037] Figure 13b illustrates another example of performing CSI-RS compression using AI model generalization.

[0038] Figure 14a is a diagram illustrating an example of aggregating CSI-RS ports along the time axis.

[0039] Figure 14b is a diagram illustrating another example of aggregating CSI-RS ports along the time axis.

[0040] FIG. 14c is a diagram illustrating an example of an input configuration when port aggregation is performed along the time axis.

[0041] FIG. 15a is a diagram illustrating an example of aggregating CSI-RS ports along the frequency axis.

[0042] FIG. 15b is a diagram illustrating an example of an input configuration when ports are aggregated along the frequency axis.

[0043] Figure 16 illustrates an example of a change in the input configuration of an AI model according to a change in the measured port for each RB during the AI ​​inference process of a frequency axis port aggregation-based CSI-RS compression method.

[0044] FIG. 17 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0045] FIG. 18 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0046] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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, LTE-A, or 5G 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.

[0051] 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 the means of instruction 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs the OFDM (orthogonal frequency division multiplexing) method for the downlink and the SC-FDMA (single carrier frequency division multiple access) method for the uplink. The above-mentioned multiple access method typically allocates and operates time-frequency resources to be sent for each user so that they do not overlap, that is, so that orthogonality is established, thereby allowing the data or control information of each user to be distinguished.

[0056] 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).

[0057] 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, 5G communication systems 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.

[0058] 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.

[0059] 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 instance, 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.

[0060] 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.

[0061] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0062] Figure 1 is a diagram illustrating an example of the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G wireless communication system.

[0063] Referring to FIG. 1, the horizontal axis 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 (resource block, RB, 104).

[0064] Figure 2 is a diagram illustrating an example of a slot structure used in a 5G wireless communication system.

[0065] Referring to FIG. 2, an example of a frame (200), subframe (201), and slot (202) structure is illustrated. 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, depending on the setting value μ for the subcarrier spacing, 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 as shown in Table 1 below.

[0066] μ 014101114202214404314808414160165143203261464064

[0067] Next, the bandwidth part (BWP) setting in a 5G communication system will be explained in detail with reference to the drawing.

[0068] Figure 3 is a diagram illustrating an example of a configuration for a bandwidth part in a 5G wireless communication system.

[0069] Referring to FIG. 3, an example is illustrated 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 following information for each bandwidth part.

[0070] 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)}

[0071] Of course, the configuration of the bandwidth part is not limited to the above examples, and various parameters related to the bandwidth part may be configured for the terminal in addition to the configuration information above. The configuration 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 parts, at least one bandwidth part may be activated. Whether the configured bandwidth part is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via downlink control information (DCI).

[0072] According to one embodiment, prior to the RRC connection, the terminal may receive an initial bandwidth part (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 through a physical downlink control channel (PDCCH) transmitted over a physical broadcast channel (PBCH) to receive system information required for initial connection (which may correspond to remaining system information, RMSI, system information block 1, or SIB1). The control resource set and search space configured by the MIB may each be considered as identity (ID) 0. The base station may notify the terminal of configuration information, such as frequency allocation information, time allocation information, and numerology, for control resource set #0 via the MIB. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and occasion for Control Resource Set #0, i.e., configuration information regarding Search Space #0. The terminal may regard the frequency range configured as Control Resource Set #0 obtained from the MIB as an initial bandwidth part for initial access, and through the configured initial bandwidth part, the terminal can receive the PDSCH (physical downlink shared channel) through which SIB1 is transmitted. At this time, the identifier (ID) of the initial bandwidth part may be considered as 0. In addition to receiving SIBs, the initial bandwidth part may also be utilized for other system information (OSI), paging, and random access.

[0073] Next, we will explain the SS / PBCH block (synchronization signal / physical broadcast channel block) in a 5G wireless communication system.

[0074] An SS / PBCH block may refer to a physical layer channel block composed of PSS (primary SS), SSS (secondary SS), and PBCH. Specifically, it may be as follows.

[0075] - PSS: A signal that serves as the reference for downlink time / frequency synchronization and provides some information about the cell ID.

[0076] - SSS: Serves as the reference for downlink time / frequency synchronization and provides the remaining cell ID information not provided by PSS. Additionally, it can serve as a reference signal for PBCH demodulation.

[0077] - PBCH: Provides essential system information required for the transmission and reception of the terminal's data and control channels. The essential system information may include search space-related control information representing wireless resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, etc.

[0078] - SS / PBCH block: An SS / PBCH block is composed of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks may be transmitted within a time of 5ms, and each transmitted SS / PBCH block may be distinguished by an index.

[0079] The terminal can detect PSS and SSS during the initial connection phase and can decode PBCH. It can obtain MIB from PBCH and receive a control resource set #0 (which may correspond to a control resource set with a control resource set index of 0, CORESET0) from it. The terminal can perform monitoring of control resource set #0 by assuming that the selected SS / PBCH block and the demodulation reference signal (DMRS) transmitted from control resource set #0 are quasi-co-located (QCL). The terminal can receive system information based on downlink control information transmitted from control resource set #0. The terminal can obtain configuration information related to the random access channel (RACH) required for initial connection from the received system information. The terminal can transmit a physical RACH (PRACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information regarding the SS / PBCH block index selected by the terminal. The base station can know that the terminal has selected a block among the respective SS / PBCH blocks and is monitoring the associated control resource set #0.

[0080] Next, downlink control information (DCI) in 5G wireless communication systems will be explained in detail.

[0081] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor a fallback DCI format and a 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.

[0082] 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 transmitted explicitly 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 has been transmitted to it.

[0083] For example, a DCI scheduling a PDSCH for system information (SI) can be scrambled as SI-RNTI. A DCI scheduling a PDSCH for a random access response (RAR) message can be scrambled as RA-RNTI (random access RNTI). A DCI scheduling a PDSCH for a paging message can be scrambled as P-RNTI (paging RNTI). A DCI notifying a slot format indicator (SFI) can be scrambled as SFI-RNTI (slot format indicator RNTI). A DCI notifying a transmit power control (TPC) can be scrambled as TPC-RNTI (transmit power control RNTI). A DCI that schedules a terminal-specific PDSCH or PUSCH can be scrambled into a C-RNTI (cell RNTI), an MCS-C-RNTI (modulation coding scheme C-RNTI), or a CS-RNTI (configured scheduling RNTI).

[0084] 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 3 below.

[0085] - Identifier for DCI formats - 1 bit - The value of this bit field is always set to 0, indicating an UL DCI format - Frequency domain resource assignment - bits where is defined in subclause 7.3.1.0○ For PUSCH hopping with resource allocation type 1:● N UL_hop MSB bits are used to indicate the frequency offset according to Subclause 6.3 of [6, TS 38.214], where N UL_hop =1 if the higher layer parameter frequencyHoppingOffsetLists contains two offset values and N UL_hop =2 if the higher layer parameter frequencyHoppingOffsetLists contains four offset values● -N UL_hop bits provides the frequency domain resource allocation according to Subclause 6.1.2.2.2 of [6, TS 38.214]○ For non-PUSCH hopping with resource allocation type 1:● bits provide the frequency domain resource allocation according to Subclause 6.1.2.2.2 of [6, TS 38.214] - Time domain resource assignment - 4 bits as defined in Subclause 6.1.2.1 of [6, TS 38.214] - Frequency hopping flag - 1 bit according to Table 7.3.1.1.1-3, as defined in Subclause 6.3 of [6, TS 38.214] - Modulation and coding scheme - 5 bits as defined in Subclause 6.1.4.1 of [6, TS 38.214] - New data indicator - 1 bit - Redundancy version - 2 bits as defined in Table 7.3.1.1.1-2 - HARQ process number (HARQ process number) - 4 bits - TPC command for scheduled PUSCH - 2 bits as defined in Subclause 7.1.1 of [5, TS 38.213] - Padding bits, if required. - UL / SUL indicator - 1 bit for UEs configured with supplementaryUplink in ServingCellConfig in the cell as defined in Table 7.3.1.1.1-1 and the number of bits for DCI format 1_0 before padding is larger than the number of bits for DCI format 0_0 before padding; 0 bit otherwise. The UL / SUL indicator, if present, locates in the last bit position of DCI format 0_0, after the padding bit(s).○ If the UL / SUL indicator is present in DCI format 0_0 and the higher layer parameter pusch-Config is not configured on both UL and SUL the UE ignores the UL / SUL indicator field in DCI format 0_0, and the corresponding PUSCH scheduled by the DCI format 0_0 is for the UL or SUL for which high layer parameter pucch-Config is configured;○ If the UL / SUL indicator is not present in DCI format 0_0 and pucch-Config is configured, the corresponding PUSCH scheduled by the DCI format 0_0 is for the UL or SUL for which high layer parameter pucch-Config is configured.○ If the UL / SUL indicator is not present in DCI format 0_0 and pucch-Config is not configured, the corresponding PUSCH scheduled by the DCI format 0_0 is for the uplink on which the latest PRACH is transmitted.

[0086] 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.

[0087] - Identifier for DCI formats (DCI 포맷 식별자) - 1 bit- The value of this bit field is always set to 0, indicating an UL DCI format- Carrier indicator (캐리어 지시자) - 0 or 3 bits, as defined in Subclause 10.1 of [5, TS38.213].- UL / SUL indicator (상향링크 / 추가적인 상향링크(Supplementary UL) 지시자) - 0 bit for UEs not configured with supplementaryUplink in ServingCellConfig in the cell or UEs configured with supplementaryUplink in ServingCellConfig in the cell but only PUCCH carrier in the cell is configured for PUSCH transmission; otherwise, 1 bit as defined in Table 7.3.1.1.1-1.- Bandwidth part indicator (대역폭파트 지시자) - 0, 1 or 2 bits as determined by the number of UL BWPs n BWP,RRC configured by higher layers, excluding the initial UL bandwidth part. The bitwidth for this field is determined as bits, where○ n BWP = n BWP,RRC if n BWP,RRC ≤3 , in which case the bandwidth part indicator is equivalent to the ascending order of the higher layer parameter BWP-Id;○ otherwise nBWP = n BWP,RRC , in which case the bandwidth part indicator is defined in Table 7.3.1.1.2-1;If a UE does not support active BWP change via DCI, the UE ignores this bit field.- Frequency domain resource assignment (주파수 도메인 자원 할당) - number of bits determined by the following, where is the size of the active UL bandwidth part:○ N RBG bits if only resource allocation type 0 is configured, where N RBG is defined in Subclause 6.1.2.2.1 of [6, TS 38.214],○ bits if only resource allocation type 1 is configured, or max( ,N RBG )+1 bits if both resource allocation type 0 and 1 are configured.○ If both resource allocation type 0 and 1 are configured, the MSB bit is used to indicate resource allocation type 0 or resource allocation type 1, where the bit value of 0 indicates resource allocation type 0 and the bit value of 1 indicates resource allocation type 1.○ For resource allocation type 0, the N RBGLSBs provide the resource allocation as defined in Subclause 6.1.2.2.1 of [6, TS 38.214].○ For resource allocation type 1, the LSBs provide the resource allocation as follows:● For PUSCH hopping with resource allocation type 1:□ N UL_hop MSB bits are used to indicate the frequency offset according to Subclause 6.3 of [6, TS 38.214], where N UL_hop =1 if the higher layer parameter frequencyHoppingOffsetLists contains two offset values and N UL_hop =2 if the higher layer parameter frequencyHoppingOffsetLists contains four offset values□ -N UL_hop bits provides the frequency domain resource allocation according to Subclause 6.1.2.2.2 of [6, TS 38.214]● For non-PUSCH hopping with resource allocation type 1:□ bits provides the frequency domain resource allocation according to Subclause 6.1.2.2.2 of [6, TS 38.214]If "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and if both resource allocation type 0 and 1 are configured for the indicated bandwidth part, the UE assumes resource allocation type 0 for the indicated bandwidth part if the bitwidth of the "Frequency domain resource assignment" field of the active bandwidth part is smaller than the bitwidth of the "Frequency domain resource assignment" field of the indicated bandwidth part.- Time domain resource assignment (시간 도메인 자원 할당) - 0, 1, 2, 3, or 4 bits as defined in Subclause 6.1.2.1 of [6, TS38.214]. The bitwidth for this field is determined as bits, where I is the number of entries in the higher layer parameter pusch-TimeDomainAllocationList if the higher layer parameter is configured; otherwise I is the number of entries in the default table.- Frequency hopping flag - 0 or 1 bit: ○ 0 bit if only resource allocation type 0 is configured or if the higher layer parameter frequencyHopping is not configured; ○ 1 bit according to Table 7.3.1.1.1-3 otherwise, only applicable to resource allocation type 1, as defined in Subclause 6.3 of [6, TS 38.214]. - Modulation and coding scheme - 5 bits as defined in Subclause 6.1.4.1 of [6, TS 38.214] - New data indicator - 1 bit - Redundancy version - 2 bits as defined in Table 7.3.1.1.1-2 - HARQ process number - 4 bits - 1st downlink assignment index - 1 or 2 bits: ○ 1 bit for semi-static HARQ-ACK codebook; 2 bits for dynamic HARQ-ACK codebook. - 2nd downlink assignment index - 0 or 2 bits: 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks; 0 bit otherwise. - TPC command for scheduled PUSCH - 2 bits as defined in Subclause 7.1.1 of [5, TS38.213]- SRS resource indicator (사운딩 기준 신호(Sounding Reference Signal; SRS) 자원 지시자) -. or bits, where N SRS is the number of configured SRS resources in the SRS resource set associated with the higher layer parameter usage of value 'codeBook' or 'nonCodeBook',○ bits according to Tables 7.3.1.1.2-28 / 29 / 30 / 31 if the higher layer parameter txConfig = nonCodebook, where N SRS is the number of configured SRS resources in the SRS resource set associated with the higher layer parameter usage of value 'nonCodeBook' and● if UE supports operation with maxMIMO-Layers and the higher layer parameter maxMIMO-Layers of PUSCH-ServingCellConfig of the serving cell is configured, L max is given by that parameter● otherwise, L max is given by the maximum number of layers for PUSCH supported by the UE for the serving cell for non-codebook based operation.○ bits according to Tables 7.3.1.1.2-32 if the higher layer parameter txConfig = codebook, where N SRSis the number of configured SRS resources in the SRS resource set associated with the higher layer parameter usage of value 'codeBook'.- Precoding information and number of layers (프리코딩 정보 및 레이어 개수) - number of bits determined by the following:○ 0 bits if the higher layer parameter txConfig = nonCodeBook;○ 0 bits for 1 antenna port and if the higher layer parameter txConfig = codebook;○ 4, 5, or 6 bits according to Table 7.3.1.1.2-2 for 4 antenna ports, if txConfig = codebook, and according to whether transform precoder is enabled or disabled, and the values of higher layer parameters maxRank, and codebookSubset;○ 2, 4, or 5 bits according to Table 7.3.1.1.2-3 for 4 antenna ports, if txConfig = codebook, and according to whether transform precoder is enabled or disabled, and the values of higher layer parameters maxRank, and codebookSubset;○ 2 or 4 bits according to Table7.3.1.1.2-4 for 2 antenna ports, if txConfig = codebook, and according to whether transform precoder is enabled or disabled, and the values of higher layer parameters maxRank and codebookSubset;○ 1 or 3 bits according to Table7.3.1.1.2-5 for 2 antenna ports, if txConfig = codebook, and according to whether transform precoder is enabled or disabled, and the values of higher layer parameters maxRank and codebookSubset.- Antenna ports (안테나 포트) - number of bits determined by the following○ 2 bits as defined by Tables 7.3.1.1.2-6, if transform precoder is enabled, dmrs-Type=1, and maxLength=1;○ 4 bits as defined by Tables 7.3.1.1.2-7, if transform precoder is enabled, dmrs-Type=1, and maxLength=2;○ 3 bits as defined by Tables 7.3.1.1.2-8 / 9 / 10 / 11, if transform precoder is disabled, dmrs-Type=1, and maxLength=1, and the value of rank is determined according to the SRS resource indicator field if the higher layer parameter txConfig = nonCodebook and according to the Precoding information and number of layers field if the higher layer parameter txConfig = codebook;○ 4 bits as defined by Tables 7.3.1.1.2-12 / 13 / 14 / 15, if transform precoder is disabled, dmrs-Type=1, and maxLength=2, and the value of rank is determined according to the SRS resource indicator field if the higher layer parameter txConfig = nonCodebook and according to the Precoding information and number of layers field if the higher layer parameter txConfig = codebook;○ 4 bits as defined by Tables 7.3.1.1.2-16 / 17 / 18 / 19, if transform precoder is disabled, dmrs-Type=2, and maxLength=1, and the value of rank is determined according to the SRS resource indicator field if the higher layer parameter txConfig = nonCodebook and according to the Precoding information and number of layers field if the higher layer parameter txConfig = codebook;○ 5 bits as defined by Tables 7.3.1.1.2-20 / 21 / 22 / 23, if transform precoder is disabled, dmrs-Type=2, and maxLength=2, and the value of rank is determined according to the SRS resource indicator field if the higher layer parameter txConfig = nonCodebook and according to the Precoding information and number of layers field if the higher layer parameter txConfig = codebook.where the number of CDM groups without data of values 1, 2, and 3 in Tables 7.3.1.1.2-6 to 7.3.1.1.2-23 refers to CDM groups {0}, {0,1}, and {0, 1,2} respectively.- SRS request (SRS 요청) - 2 bits as defined by Table 7.3.1.1.2-24 for UEs not configured with supplementaryUplink in ServingCellConfig in the cell; 3 bits for UEs configured with supplementaryUplink in ServingCellConfig in the cell where the first bit is the non-SUL / SUL indicator as defined in Table 7.3.1.1.1-1 and the second and third bits are defined by Table 7.3.1.1.2-24. This bit field may also indicate the associated CSI-RS according to Subclause 6.1.1.2 of [6, TS 38.214].- CSI request (채널 상태 정보 (Channel State Information; CSI) 요청) - 0, 1, 2, 3, 4, 5, or 6 bits determined by higher layer parameter reportTriggerSize.- CBG transmission information (CBGTI) (코드 불록 그룹(Code Block Group; CBG) 전송 정보) - 0 bit if higher layer parameter codeBlockGroupTransmission for PDSCH is not configured, otherwise, 2, 4, 6, or 8 bits determined by higher layer parameter maxCodeBlockGroupsPerTransportBlock for PUSCH.- PTRS-DMRS association (위상 트래킹 기준 신호(Phase Tracking Reference Signal)-복조 기준 신호 (Demodulation Reference Signal) 관계) - number of bits determined as follows○ 0 bit if PTRS-UplinkConfig is not configured and transform precoder is disabled, or if transform precoder is enabled, or if maxRank=1;○ 2 bits otherwise, where Table 7.3.1.1.2-25 and 7.3.1.1.2-26 are used to indicate the association between PTRS port(s) and DMRS port(s) for transmission of one PT-RS port and two PT-RS ports respectively, and the DMRS ports are indicated by the Antenna ports field.If "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and the "PTRS-DMRS association" field is present for the indicated bandwidth part but not present for the active bandwidth part, the UE assumes the "PTRS-DMRS association" field is not present for the indicated bandwidth part.- beta_offset indicator (beta offset indicator) - 0 if the higher layer parameter betaOffsets = semiStatic; otherwise 2 bits as defined by Table 9.3-3 in [5, TS 38.213].- DMRS sequence initialization (demodulation reference signal sequence initialization) - 0 bit if transform precoder is enabled; 1 bit if transform precoder is disabled.- UL-SCH indicator (Uplink-Data Channel (UL-SCH) indicator) - 1 bit. A value of "1" indicates UL-SCH shall be transmitted on the PUSCH and a value of "0" indicates UL-SCH shall not be transmitted on the PUSCH. Except for DCI format 0_1 ​​with CRC scrambled by SP-CSI-RNTI, a UE is not expected to receive a DCI format 0_1 ​​with UL-SCH indicator of "0" and CSI request of all zero(s).

[0088] DCI format 1_0 can be used as a countermeasure DCI for scheduling PDSCH, in which case 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 5 below.

[0089] - Identifier for DCI formats - 1 bit - The value of this bit field is always set to 1, indicating a DCI format - Frequency domain resource assignment - bits where is given by subclause 7.3.1.0If the CRC of the DCI format 1_0 is scrambled by C-RNTI and the "Frequency domain resource assignment" field are of all ones, the DCI format 1_0 is for random access procedure initiated by a PDCCH order, with all remaining fields set as follows:- Random Access Preamble index (랜덤 엑세스 프리엠블 인덱스) -6 bits according to ra-PreambleIndex in Subclause 5.1.2 of [8, TS38.321]- UL / SUL indicator (상향링크 / 추가적인 상향링크(Supplementary UL) 지시자) - 1 bit. If the value of the "Random Access Preamble index" is not all zeros and if the UE is configured with supplementaryUplink in ServingCellConfig in the cell, this field indicates which UL carrier in the cell to transmit the PRACH according to Table 7.3.1.1.1-1; otherwise, this field is reserved- SS / PBCH index (동기신호(Synchronization Signal; SS) / 브로드캐스트채널(Physical Broadcast Channel; PBCH) 인덱스) - 6 bits.If the value of the "Random Access Preamble index" is not all zeros, this field indicates the SS / PBCH that shall be used to determine the RACH occasion for the PRACH transmission; otherwise, this field is reserved.- PRACH Mask index (랜덤엑세스 채널(Physical Random Access Channel; PRACH) 마스크 인덱스) - 4 bits. If the value of the "Random Access Preamble index" is not all zeros, this field indicates the RACH occasion associated with the SS / PBCH indicated by "SS / PBCH index" for the PRACH transmission, according to Subclause 5.1.1 of [8, TS38.321]; otherwise, this field is reserved- Reserved bits (예비 비트) - 10 bitsOtherwise, all remaining fields are set as follows:- Time domain resource assignment (시간 도메인 자원할당) - 4 bits as defined in Subclause 5.1.2.1 of [6, TS 38.214]- VRB-to-PRB mapping (가상 자원 블록(virtual resource block)-to-물리 자원 블록(physical resource block) 매핑) - 1 bit according to Table 7.3.1.2.2-5- Modulation and coding scheme (변조 코딩 스킴) - 5 bits as defined in Subclause 5.1.3 of [6, TS 38.214]- New data indicator - 1 bit- Redundancy version - 2 bits as defined in Table 7.3.1.1.1-2- HARQ process number - 4 bits- Downlink assignment index - 2 bits as defined in Subclause 9.1.3 of [5, TS 38.213], as counter DAI- TPC command for scheduled PUCCH - 2 bits as defined in Subclause 7.2.1 of [5, TS 38.213]- PUCCH resource indicator - 3 bits as defined in Subclause 9.2.3 of [5, TS 38.213]- PDSCH-to-HARQ_feedback timing indicator (PDSCH-to-HARQ feedback timing indicator) - 3 bits as defined in Subclause 9.2.3 of [5, TS38.213].

[0090] 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 6 below.

[0091] - Identifier for DCI formats (DCI 포맷 식별자) - 1 bits○ The value of this bit field is always set to 1, indicating a DL DCI format- Carrier indicator (캐리어 지시자) - 0 or 3 bits as defined in Subclause 10.1 of [5, TS 38.213].- Bandwidth part indicator (대역폭파트 지시자) - 0, 1 or 2 bits as determined by the number of DL BWPs n BWP,RRC configured by higher layers, excluding the initial DL bandwidth part. The bitwidth for this field is determined as bits, where○ n BWP = n BWP,RRC if n BWP,RRC ≤3, in which case the bandwidth part indicator is equivalent to the ascending order of the higher layer parameter BWP-Id;○ otherwise n BWP = n BWP,RRC , in which case the bandwidth part indicator is defined in Table 7.3.1.1.2-1;If a UE does not support active BWP change via DCI, the UE ignores this bit field.- Frequency domain resource assignment (주파수 도메인 자원 할당) - number of bits determined by the following, where is the size of the active DL bandwidth part:○ N RBG bits if only resource allocation type 0 is configured, where N RBG is defined in Subclause 5.1.2.2.1 of [6, TS38.214],○ bits if only resource allocation type 1 is configured, or○ max( ,N RBG )+1 bits if both resource allocation type 0 and 1 are configured.○ If both resource allocation type 0 and 1 are configured, the MSB bit is used to indicate resource allocation type 0 or resource allocation type 1, where the bit value of 0 indicates resource allocation type 0 and the bit value of 1 indicates resource allocation type 1.○ For resource allocation type 0, the N RBG LSBs provide the resource allocation as defined in Subclause 5.1.2.2.1 of [6, TS 38.214].○ For resource allocation type 1, the LSBs provide the resource allocation as defined in Subclause 5.1.2.2.2 of [6, TS 38.214]If "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and if both resource allocation type 0 and 1 are configured for the indicated bandwidth part, the UE assumes resource allocation type 0 for the indicated bandwidth part if the bitwidth of the "Frequency domain resource assignment" field of the active bandwidth part is smaller than the bitwidth of the "Frequency domain resource assignment" field of the indicated bandwidth part.- Time domain resource assignment (시간 도메인 자원 할당) - 0, 1, 2, 3, or 4 bits as defined in Subclause 5.1.2.1 of [6, TS 38.214]. The bitwidth for this field is determined as bits, where I is the number of entries in the higher layer parameter pdsch-TimeDomainAllocationList if the higher layer parameter is configured; otherwise I is the number of entries in the default table.- VRB-to-PRB mapping (가상 자원 블록(virtual resource block)-to-물리 자원 블록(physical resource block) 매핑) - 0 or 1 bit:○ 0 bit if only resource allocation type 0 is configured or if interleaved VRB-to-PRB mapping is not configured by high layers;○ 1 bit according to Table 7.3.1.2.2-5 otherwise, only applicable to resource allocation type 1, as defined in Subclause 7.3.1.6 of [4, TS 38.211].- PRB bundling size indicator (PRB 번들링 크기 지시자) - 0 bit if the higher layer parameter prb-BundlingType is not configured or is set to 'static', or 1 bit if the higher layer parameter prb-BundlingType is set to 'dynamic' according to Subclause 5.1.2.3 of [6, TS 38.214].- Rate matching indicator (레이트매칭 지시자) - 0, 1, or 2 bits according to higher layer parameters rateMatchPatternGroup1 and rateMatchPatternGroup2, where the MSB is used to indicate rateMatchPatternGroup1 and the LSB is used to indicate rateMatchPatternGroup2 when there are two groups.- ZP CSI-RS trigger (Zero Power Channel State Information Reference Signal Trigger) - 0, 1, or 2 bits as defined in Subclause 5.1.4.2 of [6, TS 38.214]. The bitwidth for this field is determined as bits, where is the number of aperiodic ZP CSI-RS resource sets configured by a higher layer. For transport block 1: - Modulation and coding scheme - 5 bits as defined in Subclause 5.1.3.1 of [6, TS 38.214] - New data indicator - 1 bit - Redundancy version - 2 bits as defined in Table 7.3.1.1.1-2. For transport block 2 (only present if maxNrofCodeWordsScheduledByDCI equals 2): - Modulation and coding scheme - 5 bits as defined in Subclause 5.1.3.1 of [6, TS 38.214] - New data indicator - 1 bit - Redundancy version - 2 bits as defined in Table 7.3.1.1.1-2If "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and the value of maxNrofCodeWordsScheduledByDCI for the indicated bandwidth part equals 2 and the value of maxNrofCodeWordsScheduledByDCI for the active bandwidth part equals 1, the UE assumes zeros are padded when interpreting the "Modulation and coding scheme", "New data indicator", and "Redundancy version" fields of transport block 2 according to Subclause 12 of [5, TS38.213], and the UE ignores the "Modulation and coding scheme", "New data indicator", and "Redundancy version" fields of transport block 2 for the indicated bandwidth part.- HARQ process number (HARQ 프로세스 번호) -○ 4 bits- Downlink assignment index (하향링크 할당 인덱스) - number of bits as defined in the following○ 4 bits if more than one serving cell are configured in the DL and the higher layer parameter pdsch-HARQ-ACK-Codebook=dynamic, where the 2 MSB bits are the counter DAI and the 2 LSB bits are the total DAI;○ 2 bits if only one serving cell is configured in the DL and the higher layer parameter pdsch-HARQ-ACK-Codebook=dynamic, where the 2 bits are the counter DAI;○ 0 bits otherwise.- TPC command for scheduled PUCCH (스케쥴링된 PUCCH에 대한 전송 전력 제어 명령) - 2 bits as defined in Subclause 7.2.1 of [5, TS 38.213]- PUCCH resource indicator (PUCCH 자원 지시자) - 3 bits as defined in Subclause 9.2.3 of [5, TS 38.213]- PDSCH-to-HARQ_feedback timing indicator (PDSCH-to-HARQ 타이밍 지시자) - 0, 1, 2, or 3 bits as defined in Subclause 9.2.3 of [5, TS 38.213]. The bitwidth for this field is determined as bits, where I is the number of entries in the higher layer parameter dl-DataToUL-ACK.- Antenna port(s) (안테나 포트) - 4, 5, or 6 bits as defined by Tables 7.3.1.2.2-1 / 2 / 3 / 4, where the number of CDM groups without data of values 1, 2, and 3 refers to CDM groups {0}, {0,1}, and {0, 1,2} respectively. The antenna ports. shall be determined according to the ordering of DMRS port(s) given by Tables 7.3.1.2.2-1 / 2 / 3 / 4.- Transmission configuration indication (전송 설정 지시자) - 0 bit if higher layer parameter tci-PresentInDCI is not enabled; otherwise 3 bits as defined in Subclause 5.1.5 of [6, TS38.214].If "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part,- if the higher layer parameter tci-PresentInDCI is not enabled for the CORESET used for the PDCCH carrying the DCI format 1_1,○ the UE assumes tci-PresentInDCI is not enabled for all CORESETs in the indicated bandwidth part;- otherwise,○ the UE assumes tci-PresentInDCI is enabled for all CORESETs in the indicated bandwidth part.- SRS request (SRS 요청) - 2 bits as defined by Table 7.3.1.1.2-24 for UEs not configured with supplementaryUplink in ServingCellConfig in the cell; 3 bits for UEs configured with supplementaryUplink in ServingCellConfig in the cell where the first bit is the non-SUL / SUL indicator as defined in Table 7.3.1.1.1-1 and the second and third bits are defined by Table 7.3.1.1.2-24. This bit field may also indicate the associated CSI-RS according to Subclause 6.1.1.2 of [6, TS 38.214].- CBG transmission information (CBGTI) (코드 블록 그룹 전송 정보) - 0 bit if higher layer parameter codeBlockGroupTransmission for PDSCH is not configured, otherwise, 2, 4, 6, or 8 bits as defined in Subclause 5.1.7 of [6, TS38.214], determined by the higher layer parameters maxCodeBlockGroupsPerTransportBlock and maxNrofCodeWordsScheduledByDCI for the PDSCH.- CBG flushing out information (CBGFI) (코드 블록 그룹 플러싱 아웃 정보) - 1 bit if higher layer parameter codeBlockGroupFlushIndicator is configured as "TRUE", 0 bit otherwise.- DMRS sequence initialization (복조 기준 신호 시퀀스 초기화) - 1 bit.

[0092] The following describes the time domain resource allocation method for data channels in a 5G wireless communication system.

[0093] The base station may set a table for time domain resource allocation information for the downlink data channel (PDSCH) and uplink data channel (PUSCH) for the terminal using upper-layer signaling (e.g., RRC signaling). For PDSCH, a table consisting of a maximum of maxNrofDL-Allocations = 16 entries may be set, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 16 entries may be set. Time domain resource allocation information may include, for example, PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information regarding the position and length of the starting symbol for which the PDSCH or PUSCH is scheduled within the slot, and the mapping type of the PDSCH or PUSCH. For example, information such as that shown in Tables 7 and 8 below may be notified from the base station to the terminal.

[0094] PDSCH-TimeDomainResourceAllocationListinformation elementPDSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofDL-Allocations)) OF PDSCH-TimeDomainResourceAllocationPDSCH-TimeDomainResourceAllocation ::= SEQUENCE {k0 INTEGER(0..32) OPTIONAL, -- Need S(PDCCH-to-PDSCH timing, slots)mappingType ENUMERATED {typeA, typeB},(PDSCH mapping type)startSymbolAndLength INTEGER (0..127)(start symbol and length of PDSCH)}

[0095] PUSCH-TimeDomainResourceAllocationinformation elementPUSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF PUSCH-TimeDomainResourceAllocationPUSCH-TimeDomainResourceAllocation ::= SEQUENCE {k2 INTEGER(0..32) OPTIONAL, -- Need S(PDCCH-to-PUSCH timing, slots)mappingType ENUMERATED {typeA, typeB},(PUSCH mapping type)startSymbolAndLength INTEGER (0..127)(start symbol and length of PUSCH)}

[0096] The base station may notify the terminal of one of the entries in the table for time domain resource allocation information via L1 signaling (e.g., DCI) (e.g., by indicating the 'time domain resource allocation' field within the DCI). Based on the DCI received from the base station, the terminal may obtain time domain resource allocation information for PDSCH or PUSCH.

[0097] The following describes the frequency domain resource allocation method for data channels in a 5G wireless communication system.

[0098] In a 5G wireless communication system, two types, resource allocation type 0 and resource allocation type 1, are supported as methods for indicating frequency domain resource allocation information for downlink data channels and uplink data channels.

[0099] The base station can set the resource allocation type to the terminal through upper layer signaling (for example, the upper layer parameter resourceAllocation can be set to one of resourceAllocationType0, resourceAllocationType1, or dynamicSwitch). If the terminal is set to both resource allocation types 0 and 1 (or if the upper layer parameter resourceAllocation is similarly set to dynamicSwitch), the base station can indicate whether the bit corresponding to the MSB (most significant bit) of the resource allocation field within the DCI format that directs scheduling is resource allocation type 0 or resource allocation type 1. Additionally, based on the indicated resource allocation type, resource allocation information can be indicated through the remaining bits excluding the bit corresponding to the MSB, and the terminal can interpret the resource allocation field information of the DCI field based on this. If the terminal is set to either resource allocation type 0 or resource allocation type 1 (or if the upper layer parameter resourceAllocation is set to either resourceAllocationType0 or resourceAllocationType1), resource allocation information may be indicated based on the resource allocation type in which the resource allocation field in the DCI format instructing scheduling is set, and the terminal may interpret the resource allocation field information of the DCI field based on this.

[0100] In the following, the downlink control channel in a 5G wireless communication system will be explained in more detail with reference to the drawings.

[0101] Figure 4 is a diagram illustrating an example of a set of control resources transmitted by a downlink control channel in a 5G wireless communication system.

[0102] Referring to FIG. 4, two control resource sets (control resource set #1 (401), control resource set #2 (402)) can be set within the terminal's bandwidth part (UE bandwidth part, 410) on the frequency axis and within one slot (420) on the time axis. The control resource sets (401, 402) can be set to a specific frequency resource (403) within the entire terminal bandwidth part (410) on the frequency axis. Additionally, the control resource sets (401, 402) can be set to one or more OFDM symbols on the time axis, which can be defined as the control resource set duration (404). Referring to the example illustrated in FIG. 4, control resource set #1 (401) is set to a control resource set duration of 2 symbols, and control resource set #2 (402) is set to a control resource set duration of 1 symbol.

[0103] In the aforementioned 5G wireless communication system, a control resource set can be configured by a base station to a terminal through upper-layer signaling (e.g., system information, MIB, RRC signaling). Configuring a control resource set to a terminal means providing information such as the control resource set identifier, the frequency location of the control resource set, and the symbol length of the control resource set. For example, it may include the following information.

[0104] ControlResourceSet ::= SEQUENCE {-- Corresponds to L1 parameter 'CORESET-ID'controlResourceSetId ControlResourceSetId,(ControlResourceSetIdentifier(Identity))frequencyDomainResources BIT STRING (SIZE (45)),(FrequencyAxisResourceAllocationInfo)duration INTEGER (1..maxCoReSetDuration),(TimeAxisResourceAllocationInfo)cce-REG-MappingType CHOICE {(CCE-to-REG MappingType)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}

[0105] In Table 9, the tci-StatesPDCCH (simply named TCI (transmission configuration indication) state) configuration information may include information on one or more SS / PBCH block indices or CSI-RS (channel state information reference signal) indices that are in a relationship with DMRS and QCL transmitted from the corresponding control resource set. FIG. 5 is a diagram illustrating an example of the structure of a downlink control channel of a 5G wireless communication system. FIG. 5 illustrates an example of the basic unit of time and frequency resources that constitute a downlink control channel that can be used in a 5G wireless communication system.

[0106] Referring to FIG. 5, the basic unit of time and frequency resources constituting a 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.

[0107] As illustrated in FIG. 5, if the basic unit to which a downlink control channel is allocated in a 5G wireless communication 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 resource set is established, the corresponding 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 resource set. The CCEs (504) in the control resource set are distinguished by numbers, and the numbers of the CCEs (504) can be assigned according to a logical mapping method.

[0108] 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 for decoding, 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.

[0109] 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.

[0110] In a 5G wireless communication 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 index of the control resource set to be monitored in the search space. For example, parameters for the search space for a PDCCH may include the information in Table 10 below.

[0111] 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 resource set 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 {(தமாற்க்குக்க்கு திய்தை)-- 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},...}.

[0112] According to the configuration information, the base station may configure one or more sets of search spaces for the terminal. According to one embodiment, 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.

[0113] 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.

[0114] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, MCS-C-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0115] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0116] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0117] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0118] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0119] 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.

[0120] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0121] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0122] The specified RNTIs may follow the definitions and uses below.

[0123] C-RNTI: Used for terminal-specific PDSCH scheduling

[0124] MCS-C-RNTI: Used for terminal-specific PDSCH scheduling

[0125] TC-RNTI (temporary cell RNTI): Used for terminal-specific PDSCH scheduling

[0126] CS-RNTI (configured scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0127] RA-RNTI: Used for PDSCH scheduling during the random access phase

[0128] P-RNTI: Used for PDSCH scheduling where paging is transmitted

[0129] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0130] INT-RNTI (interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0131] TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0132] TPC-PUCCH-RNTI (transmit power control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0133] TPC-SRS-RNTI (transmit power control for SRS RNTI): Used to instruct power control commands for the SRS (sounding reference signal).

[0134] The aforementioned specified DCI formats may follow the definitions in Table 11 below.

[0135] 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

[0136] 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.

[0137] [Mathematical Formula 1]

[0138]

[0139] - L: Lamination Level

[0140] - n CI : Carrier Index

[0141] - n CCE,p : Total number of CCEs existing in CORESET p

[0142] - : Slot Index

[0143] - : Number of PDCCH candidates at assembly level L

[0144] - = 0, ..., -1: PDCCH candidate index of aggregation level L

[0145] - l = 0, ..., L -1

[0146] - , 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

[0147] - n RNTI : Terminal identifier

[0148] The value may be 0 for the common search space.

[0149] 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.

[0150] 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.

[0151] 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 12 to transmit information regarding a resource setting.

[0152] -- 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

[0153] In Table 12, 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 contain at least one resource, which may be an index of a CSI-RS resource or an SS / PBCH block. 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). For example, if the resource set includes CSI-RS, the base station and the terminal may exchange signaling information such as that shown in Table 13 to transmit information about the resource set.

[0154] -- 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

[0155] In Table 13, the signaling information NZP-CSI-RS-ResourceSet contains information about 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). CSI-RS may be the most representative reference signal included in the resource set. The base station and the terminal may exchange signaling information such as that in Table 14 to transmit information regarding the CSI-RS resource.

[0156] -- 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

[0157] In Table 14, 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: - nzp-CSI-RS-ResourceId: CSI-RS resource index

[0158] - resourceMapping: Resource mapping information of CSI-RS resources

[0159] - powerControlOffset: Ratio between PDSCH EPRE (Energy Per RE) and CSI-RS EPRE

[0160] - powerControlOffsetSS: Ratio between SS / PBCH block EPRE and CSI-RS EPRE

[0161] - scramblingID: Scrambling index of the CSI-RS sequence

[0162] - periodicityAndOffset: Transmission period and slot offset of the CSI-RS resource

[0163] - qcl-InfoPeriodicCSI-RS: TCI-state information if the corresponding CSI-RS is a periodic CSI-RS

[0164] 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 15 below.

[0165] [Table 15]

[0166]

[0167] Table 15 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} and Y=2, CSI-RS RE positions can be assigned for every two subcarriers within the PRB, and CSI-RS RE positions can be assigned by a 6-bit bitmap. When the number of CSI-RS ports is 4 and Y=4, CSI-RS RE positions can be assigned for every four subcarriers within the PRB, and CSI-RS RE positions can be assigned by a 3-bit bitmap. Similarly, time axis RE positions can be assigned by a total of 14-bit bitmaps. In this case, depending on the Z value in Table 15, it is possible to change the length of the bitmap as with frequency position assignment, but since the principle is similar to the explanation above, redundant explanations will be omitted below.

[0168] 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.

[0169] 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 16 to transmit information regarding the report setting.

[0170] -- 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]]}.

[0171] In Table 16, the signaling information CSI-ReportConfig contains information regarding each report setting. The information included in the above signaling information CSI-ReportConfig may have the following meanings: - reportConfigId: report setting index

[0172] - carrier: Serving cell index

[0173] - resourcesForChannelMeasurement: Resource setting index for channel measurement linked to report setting

[0174] - csi-IM-ResourcesForInterference: Resource setting index containing CSI-IM resources for interference measurement that have a connection with the report setting

[0175] - nzp-CSI-RS-ResourcesForInterference: Resource setting index containing CSI-RS resources for interference measurement that have a relationship with the report setting

[0176] - 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.

[0177] - 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).

[0178] - 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.

[0179] - timeRestrictionForChannelMeasurements: Whether there are time axis constraints on the reference signal for channel measurement among the reference signals referenced by the reported channel information.

[0180] - timeRestrictionForInterferenceMeasurements: Whether there are time axis constraints on the reference signal for interference measurement among the reference signals referenced by the reporting channel information.

[0181] - codebookConfig: Codebook information referenced by the reporting channel information

[0182] - groupBasedBeamReporting: Whether to group beams in channel reporting

[0183] - cqi-Table: CQI table index referenced by the reporting channel information

[0184] - subbandSize: An index indicating the subband size of the channel information

[0185] - non-PMI-PortIndication: Port mapping information referenced when reporting non-PMI channel information

[0186] 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.

[0187] The base station may instruct the terminal to report channel state information 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).

[0188] 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.

[0189] 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 PUSCH 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 slot intervals or possible 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 a 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.

[0190] 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.

[0191] 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 report channel information periodically according to the 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 containing parameters for the terminal's periodic CSI report via upper layer signaling. 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.

[0192] When a base station instructs a terminal to perform a non-periodic or semi-continuous CSI reporting via DCI, the terminal can determine whether it can perform a valid channel report through the instructed CSI reporting by considering the channel computation time required for the CSI reporting. For the non-periodic or semi-continuous CSI reporting instructed via DCI, the terminal can perform a valid CSI reporting starting from the uplink symbol after the Z symbol, after the last symbol included in the PDCCH containing the DCI instructing the CSI reporting has ended. The aforementioned Z symbol may vary depending on the numerology of the downlink bandwidth part corresponding to the PDCCH containing the DCI instructing the CSI reporting, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI reporting, and the type or characteristics of the CSI reported in the CSI reporting (report quantity, frequency band granularity, number of ports of the reference signal, codebook type, etc.). In other words, for a CSI report to be determined as a valid CSI report, the uplink transmission of the said CSI report must include TA (timing advance) and Z ref It must not be executed before the symbol. In this case, Z ref The symbol is time from the moment the last symbol of the above-mentioned triggering PDCCH ends. It is an uplink symbol that initiates the CP (cyclic prefix). Here, the detailed value of Z follows the explanation below, , , N f =4096, κ=64, and μ is the numerology. Here, μ is (μ PDCCH , μ CSI-RS , μ UL The largest T among ) proc,CSI It can be promised to use what causes the value, and μ PDCCHμ is the subcarrier spacing used for PDCCH transmission. CSI-RS μ is the subcarrier spacing used for CSI-RS transmission. UL can refer to the subcarrier spacing of the uplink channel used for transmitting UCI (uplink control information) for CSI reporting. As another example, μ is (μ PDCCH , μ UL The largest T among ) proc,CSI It is also possible to promise to use what causes the value μ PDCCH and μ UL Refer to the explanation above for the definition of. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI Report Validity Condition 1.

[0193] In addition, if the reference signal for channel measurement regarding the aperiodic CSI report instructed to the terminal via the DCI is an aperiodic reference signal, a valid CSI report can be performed starting from the uplink symbol following the Z' symbol after the end of the last symbol containing the reference signal; the aforementioned Z' symbol may vary depending on the numerology of the downlink bandwidth part corresponding to the PDCCH containing the DCI instructing the CSI report, the numerology of the bandwidth corresponding to the reference signal for channel measurement regarding the CSI report, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI report, and the type or characteristics of the CSI reported in the CSI report (report quantity, frequency band granularity, number of ports of the reference signal, codebook type, etc.). In other words, for a certain CSI report to be determined as a valid CSI report, the uplink transmission of the said CSI report must include TA and Z ref' It must not be executed before the symbol. In this case, Z ref' The symbol is time from the moment the last symbol of the non-periodic CSI-RS or non-periodic CSI-IM triggered by the above-mentioned triggering PDCCH ends. This is the uplink symbol that starts the CP. Here, the detailed value of Z' follows the explanation below, , , N f =4096, κ=64, and μ is the numerology. Here, μ is (μ PDCCH , μ CSI-RS , μ UL The largest T among ) proc,CSI It can be promised to use what causes the value, and μ PDCCH μ is the subcarrier interval used for triggering PDCCH transmission. CSI-RS μ is the subcarrier spacing used for CSI-RS transmission. UL may refer to the subcarrier spacing of the uplink channel used for UCI transmission for CSI reporting. As another example, μ is (μ PDCCH , μ UL The largest T among ) proc,CSI It can be promised to use what causes the value. In this case, μ PDCCH and μ UL Refer to the explanation above for the definition of. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI Report Validity Condition 2.

[0194] If a base station instructs a terminal to report a non-periodic CSI for a non-periodic reference signal via DCI, the terminal may perform a valid CSI report starting from the first uplink symbol that satisfies both the time point Z after the end of the last symbol included in the PDCCH containing the DCI instructing the CSI report and the time point Z' after the end of the last symbol containing the reference signal. That is, in the case of a non-periodic CSI report based on a non-periodic reference signal, it is determined to be a valid CSI report only if it satisfies both CSI report validity conditions 1 and 2.

[0195] If the CSI reporting time specified by the base station does not satisfy the CSI calculation time requirements, the terminal may determine that the CSI report is invalid and not consider a CSI status update for the CSI report.

[0196] The Z and Z' symbols for calculating the CSI calculation time described above follow Tables 17 and 18 below. For example, if the CSI reported in the CSI report contains only broadband information, the number of reference signal ports is 4 or less, the reference signal resource is one, the codebook type is 'typeI-SinglePanel', or the type of the reported CSI (report quantity) is 'cri-RI-CQI', the Z and Z' symbols follow the Z1 and Z1' values ​​in Table 18. This will be referred to as delay requirement 2. In addition, if the PUSCH containing the CSI report does not include a transmission block or HARQ-ACK (hybrid automatic repeat request acknowledgment) and the terminal's CSI processing unit (CSI processing unit, CPU) occupation is 0, the Z and Z' symbols follow the Z1 and Z1' values ​​in Table 17 and this will be referred to as delay requirement 1. The explanation regarding the aforementioned CPU occupancy is described in detail below. Additionally, when the reportquantity is 'cri-RSRP' or 'ssb-Index-RSRP', the Z and Z' symbols follow the Z3 and Z3' values ​​in Table 18. X1, X2, X3, and X4 in Table 18 represent the terminal's capability (UE capability) regarding beam reporting time, and KB1 and KB2 in Table 18 represent the terminal's capability regarding beam switching time. If the type or characteristic of the CSI reported in the aforementioned CSI report does not apply, the Z and Z' symbols follow the Z2 and Z2' values ​​in Table 18.

[0197] μZ1[symbols]Z1Z'10108113112252134336

[0198] μZ1[symbols]Z2[symbols]Z3[symbols]Z1Z'1Z2Z'2Z3Z'302216403722X113330726933X224442141140min(44, X3+KB1)X339785152140min(97, X4+KB2)X4

[0199] When a base station instructs a terminal to perform non-periodic, semi-continuous, or periodic CSI reporting, 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 to be measured for the CSI, as specified in the CSI report configuration, and may correspond, respectively, to the carrier and reportFreqConfiguration within the higher-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 be transmitted, the time of the CSI reference resource for CSI report #X is the downlink slot nn of the carrier and BWP measuring the CSI. CSI-ref It can be defined as. The downlink slot n represents the numerology of the carrier and BWP measuring CSI μ DL , CSI report #X transmitting carrier and BWP numerology μ UL When named as It is calculated as. n, the slot interval between the downlink slot n and the CSI reference signal slot n. CSI-ref If CSI report #X transmitted in uplink slot n' is a semi-continuous or periodic CSI report, depending on the number of CSI-RS / SSB resources for channel measurements, if a single CSI-RS / SSB resource is connected to the said CSI report If it follows and multiple CSI-RS / SSB resources are linked to the relevant CSI report Follows. If the CSI report #X transmitted in uplink slot n' is a non-periodic CSI report, considering the CSI calculation time Z' for channel measurement It is calculated as. The aforementioned is the number of symbols included in one slot, and in NR, it is assumed to be 14.

[0200] 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.

[0201] In embodiments of the present disclosure, CSI-RS / CSI-IM / SSB occasion refers to the transmission time of 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 semi-persistent or periodic CSI-RS resources, the slot to be transmitted is determined according to the slot period and slot offset set by the upper layer signaling, and the slot-transmitted symbol(s) are determined by referring to one of the slot-transmitted resource mapping methods of Table 16 according to resource mapping information. For another example, for aperiodic CSI-RS resources, the slot to be transmitted is determined according to the slot offset with the PDCCH containing the DCI indicating channel reporting set by the upper layer signaling, and the slot-transmitted symbol(s) are determined by referring to one of the slot-transmitted resource mapping methods of Table 16 according to resource mapping information.

[0202] 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.

[0203] - 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.

[0204] - 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

[0205] 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.

[0206] 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'.

[0207] 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.

[0208] - 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'.

[0209] - 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'.

[0210] 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).

[0211] The base station may instruct a CSI report by considering the amount of CSI that the terminal can simultaneously calculate for the CSI report, that is, the number of the terminal's CSI processing units (CPUs). The number of CSI processing units that the terminal can simultaneously calculate is N CPU If so, the terminal is N CPU Do not expect CSI report instructions from base stations requiring more CSI calculations, or N CPU Updates to the CSI that require more CSI 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.

[0212] The CSI report instructed by the base station to the terminal is the total number of CSIs N that the terminal can calculate simultaneously. CPU Assume that some or all of the CPUs are occupied for CSI calculations. For each CSI report, for example, the number of CSI calculation units required for CSI report n (n=0, 1, ... N-1) If so, the number of CSI calculation units required for a total of N CSI reports is It can be said that. The CSI calculation units required for each reportQuantity set in the CSI report can be set as follows.

[0213] - : 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.

[0214] If, at a specific point in time, the number of channel information calculations required by the terminal for multiple CSI reports exceeds the number of channel information calculation units (NCPUs) that the terminal can simultaneously process, 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 channel information calculations required for the CSI report occupy the CPU and the priority of the reported channel information. For example, it is possible to not consider updating channel information for a CSI report where the time the channel information calculations required for the CSI report start occupying the CPU is the latest, and to prioritize not considering channel information updates for CSI reports with lower channel information priority.

[0215] The priority of the above channel information can be determined by referring to Table 20 below.

[0216] 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, Ncells: maximum number of serving cells configured for upper-tier signaling (maxNrofServingCells); - s: CSI report configuration index (reportConfigID), Ms: maximum number of CSI report configurations configured for upper-tier signaling (maxNrofCSI-ReportConfigurations).

[0217] The CSI priority for the CSI report is the priority value Pri in Table 20. iCSI It is determined through (y,k,c,s). Referring to Table 20, 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.

[0218] 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.

[0219] Regarding the aforementioned CSI report settings (CSI-ReportConfig), each report setting CSI-ReportConfig can be associated with a single downlink (DL) bandwidth portion identified by the upper-layer parameter bandwidth portion identifier (bwp-id) given by the CSI-ResourceConfig, which is associated with the corresponding report setting. As for the time domain reporting operation for each report setting CSI-ReportConfig, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, and these 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 (UL) 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).

[0220] 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 (DL) 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.

[0221] - CSI-IM resources for interference measurement

[0222] - NZP CSI-RS resources for interference measurement

[0223] - NZP CSI-RS resources for channel measurement

[0224] 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.

[0225] 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 being activated by the MAC control element (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 21 below.

[0226] 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.

[0227] Aperiodic 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 can be set to NTS (=0, 1, 2, 3, 4, 5, or 6) bits and can be determined by the upper layer signaling (reportTriggerSize). One trigger state among one or more aperiodic CSI reporting trigger states that can be set by the upper layer signaling (CSI-AperiodicTriggerStateList) can be triggered by the CSI request indicator.

[0228] - If all bits of the CSI request field are 0, this may mean that a CSI report is not requested.

[0229] - If the number of CSI trigger states (M) in the configured CSI-AperiodicTriggerStateLite is greater than 2NTs-1, then M CSI trigger states can be mapped to 2NTs-1 according to the selected mapping relationship, and one of the trigger states of 2NTs-1 can be indicated as a CSI request field.

[0230] - If the number of CSI trigger states (M) in the configured CSI-AperiodicTriggerStateLite is less than or equal to 2NTs-1, one of the M CSI trigger states may be indicated as a CSI request field.

[0231] Table 22 below shows an example of the relationship between CSI request indicators and CSI trigger states that can be indicated by those indicators.

[0232] 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

[0233] 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.

[0234] Figure 6 is a diagram illustrating an example of a non-periodic CSI reporting method.

[0235] In the example (600) of FIG. 6, the terminal can monitor the PDCCH (601) to obtain the DCI format 0_1, from which it can obtain scheduling information and CSI request information for the PUSCH (605). The terminal can obtain resource information for the CSI-RS (602) 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 (602) 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 mentioned 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 non-periodic 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 23 below.

[0236] aperiodicTriggeringOffsetOffset X00 slot11 slot22 slots33 slots44 slots516 slots624 slots

[0237] In one example (600) of FIG. 6, an example is shown in which the aforementioned offset value is set to X=0. In this case, the terminal can receive CSI-RS (602) in a slot (corresponding to slot 0 (606) in FIG. 6) 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 (605). The terminal can obtain scheduling information for PUSCH (605) 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 (605) from the aforementioned time domain resource allocation information for PUSCH (605) in DCI format 0_1. In example (600) of FIG. 6, the terminal obtains a K2 value corresponding to the slot offset value for PDCCH-to-PUSCH as 3, and accordingly, PUSCH (605) can be transmitted from slot 3 (609), which is 3 slots away from slot 0 (606), at the time when PDCCH (601) is received. In example (610) of FIG. 6, the terminal can monitor PDCCH (611) to obtain DCI format 0_1, from which scheduling information and CSI request information for PUSCH (615) can be obtained. The terminal can obtain resource information for CSI-RS (612) to be measured from the received CSI request indicator. Example (610) of FIG. 6 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 (612) in the slot that receives DCI format 0_1 ​​that triggers a non-periodic CSI report (corresponding to slot 0 (616) in FIG. 6), and can report the CSI information measured by the received CSI-RS to the base station via PUSCH (615).

[0238] A non-periodic CSI report may include at least one or both of CSI part 1 or CSI part 2, and when the non-periodic CSI report is transmitted via PUSCH, it may be multiplexed with a transport block. For multiplexing, a CRC may be inserted into the input bits of the non-periodic 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 non-periodic CSI report can be calculated as follows.

[0239]

[0240]

[0241] 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. 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.

[0242] Additionally, regarding PUSCH repeat transmission method B, if a terminal receives a DCI that schedules a non-periodic CSI report or enables a semi-permanent CSI report without scheduling for a 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 a terminal schedules or enables a non-periodic or semi-permanent CSI report without scheduling for a 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 a semi-permanent CSI based on PUSCH repeat transmission method B without scheduling for a DCI after semi-permanent CSI reporting is enabled by a DCI, if the first nominal repetition is different from the first actual repetition, the transmission for the first nominal repetition may be ignored.

[0243] In the future, when the frequency band is extended to frequency range 3 (FR3) and services are provided, the CSI-RS ports for acquiring channel state information may be configured up to, for example, 256 ports. Since supporting such a large number of CSI-RS ports inevitably increases the overhead for CSI-RS transmission, a method and apparatus are required to reduce the number of CSI-RS ports for transmission. The present disclosure proposes a method and apparatus for estimating the channel state of all ports based on a small number of CSI-RS ports while reducing CSI-RS overhead by compressing the large number of CSI-RS (for example, compressing 256 ports into 128 CSI-RS ports) based on artificial intelligence model transmission.

[0244] The CSI-RS overhead reduction method proposed in this disclosure is described below through specific embodiments. The first to fourth embodiments described below may be implemented separately and / or at least some of them may be implemented in combination.

[0245] <1st Example>

[0246] FIG. 7 is a diagram illustrating an example of the concept of AI-based CSI-RS compression to reduce CSI-RS overhead applied to various embodiments of the present disclosure.

[0247] Referring to FIG. 7, the base station (721) configures the compressed CSI-RS (712) through a CSI-RS port compression (701) procedure when transmitting CSI-RS (711) for all antenna ports. The CSI-RS port compression (701) may be a port sampling procedure that selects only some CSI-RS ports from all CSI-RS ports. For example, the base station selects some M ( <N)개의 CSI-RS 포트만을 사용해 M 개의 CSI-RS를 전송할 수 있다. 또한 CSI-RS 포트 압축 (701)은 전체 CSI-RS 포트에 대해 포트 결합(port combining)을 수행하는 절차일 수 있다. 예를 들어, 전체 N개의 CSI-RS 포트에 대해 일정 k개의 포트를 1개의 CSI-RS 포트로 포트 결합한다면 기지국은 N / k 개의 CSI-RS를 전송할 수 있다. 상기 포트 샘플링에서 선택되는 포트 및 포트 결합에서 결합되는 포트는 인공지능(artificial intelligence, AI)에 기반하여 수행되는 절차일 수 있다. 기지국은 상기 CSI-RS 포트 압축 (701)에 기반하여 압축된 CSI-RS (712)를 채널 (713)을 통해 단말 (722)로 전송한다.

[0248] A terminal (722) can receive compressed CSI-RS from a base station (721) and obtain a compressed CSI-RS measurement (714). Based on the compressed CSI-RS measurement (714), the terminal estimates the channel corresponding to the compressed CSI-RS port (702). Through the above estimation, the terminal can obtain a compressed CSI-RS port channel (715) corresponding to the compressed CSI-RS port. Based on the obtained compressed CSI-RS port channel (715), the terminal can restore the entire CSI-RS port channel (716) (703). This is a concept applicable to various embodiments of the present disclosure. An AI model may be utilized in the procedure (703) for restoring the entire CSI-RS port channel from the compressed CSI-RS port channel.

[0249] The terminal generates channel state information (CSI) for the restored entire CSI-RS port channel (716) (704). The channel state information may include at least one precoding matrix indicator (PMI), channel quality indicator (CQI), and rank indicator (RI) for the entire CSI-RS port channel, but the channel state information is not limited to this example, and information indicating the restored entire CSI-RS port channel (716) may correspond to the channel state information. The terminal may feed back the generated channel state information to the base station (717). In addition, although the above example illustrates an example in which the entire CSI-RS port channel (716) is restored based on the compressed CSI-RS port channel (715), in the present disclosure, the entire CSI-RS port channel (716) must not necessarily be restored, and it is also possible to restore only a portion of the CSI-RS port channel.

[0250] FIG. 8 illustrates an example of real number input / output and complex number input / output of an AI model according to an embodiment of the present disclosure. A channel estimated through CSI-RS at a terminal may have a complex value. The estimated complex value channel is used as an input to an AI model for AI inference. Depending on the implementation method of the base station (or terminal), the AI ​​model may process complex value inputs or real value inputs. In the case of an AI model (820) that uses complex value inputs, an array (800) corresponding to the complex value channel may be used as an input. When the complex value input (800) is used, a complex value corresponding to the channel reconstructed as an output may be obtained. For a complex value channel to be applied to an AI model (821) that uses real value inputs, a process of converting the complex value channel into a real value input may be included. As an example of converting a complex value channel into a real value input, if the complex value channel is separated into a real part and an imaginary part (810), two arrays of real values ​​corresponding to the separated real part and imaginary part can be obtained. An AI model (821) using the real value input can use the two arrays of real values ​​obtained above as input. When the real value input is used, two real values ​​corresponding to the real part and the imaginary part, respectively, corresponding to the channel reconstructed as output can be obtained.

[0251] As explained above, the types of inputs to an AI model may vary depending on the implementation of the AI ​​model at the base station. Therefore, regarding the transmission of an AI model—including cases where the AI ​​model structure is specified in the standard and the base station transmits weights to the terminal, as well as cases where information regarding the model structure and weights constituting the AI ​​model is not specified and the base station transmits the AI ​​model structure and weights to the terminal—the terminal must be instructed on the input type from the base station to enable accurate AI inference.

[0252] FIGS. 9a and 9b illustrate an example of a method for configuring the axes of the input and output of an AI model for CSI-RS compression applied to various embodiments of the present disclosure.

[0253] Referring to FIGS. 9a and 9b, AI-based channel restoration model 1 (900) and AI-based channel restoration model 2 (910) restore a compressed CSI-RS port channel to a full CSI-RS port channel. However, in the two cases, the axis of the compressed CSI-RS port channel used as input to the AI ​​model may differ depending on the implementation method of the AI ​​model of the base station.

[0254] For example, referring to FIG. 9a, the AI-based channel restoration model 1 (900) uses two arrays separated into a real part channel (901) and an imaginary part channel (902) as inputs. Each separated channel can be represented as a two-dimensional array consisting of a frequency axis (903) and a compressed port axis (904). Based on this, the axes of the input array in the AI-based channel restoration model 1 can be an input type axis representing a real value input or a complex value input, a frequency axis, and a compressed port axis (referring to FIG. 9a, the input is represented as [input type axis, frequency axis, compressed port axis] (905)). As the output of the AI-based channel restoration model 1, the real part output (906) and the imaginary part output (907) of the entire port channel restored for the frequency axis-compressed port axis channel, identical to the input, can be obtained. Therefore, the axis configuration of the output array can be [input type axis, frequency axis, compressed port axis] (908).

[0255] Referring to an example of the AI-based channel restoration model 2 (910) in FIG. 9b, the AI-based channel restoration model 2 (910) uses two arrays as inputs, separated into a real part channel (911) and an imaginary part channel (912). Each separated channel can be represented as a three-dimensional array consisting of a time axis (913), a frequency axis (914), and a compressed port axis (915). Based on this, the input of the AI-based channel restoration model 2 can be represented as [input type axis, time axis, frequency axis, compressed port axis] (916). As the output of the AI-based channel restoration model 2, the real part output (917) and the imaginary part output (918) of the entire port channel restored for the time axis-frequency axis-compressed port axis channels, identical to the input, can be obtained. Accordingly, the axis configuration of the output array can be [input type axis, time axis, frequency axis, compressed port axis] (919).

[0256] When a terminal performs AI inference using an AI model transmitted from a base station, it may receive instructions regarding the input axis configuration and output axis configuration information of the transmitted AI model. Based on the instructions regarding axis configuration information, the terminal may configure a port channel compressed to match the input axis and use it for AI inference. Additionally, the terminal may perform post-processing, including at least CSI generation, on the entire port channel restored based on the output axis configuration information. The CSI generation may include an operation to generate a CSI to be reported to the base station.

[0257] FIG. 10 is a diagram illustrating an example of settings for the input and output of an AI model in an AI model transmission-based CSI-RS compression method according to one embodiment of the present disclosure. The input and output settings of the AI ​​model may be distinguished by an index (1000). The input and output setting information of the AI ​​model indicated by the index (1000) may include at least one of an input type (1001), an input / output axis (1002), an input dimension (1003), and an output dimension (1004), and the input and output setting information of the AI ​​model is not limited to this example, such as specific information being omitted or added.

[0258] Referring to FIG. 10, the input types of the input and output can consist of real numbers and complex numbers. As described in FIG. 8, depending on the implementation method of the AI ​​model of the base station, the AI-based channel restoration model may use either complex value inputs or real value inputs. The input / output axis represents the axis configuration for the input array and the output array. As elements of the axis configuration, at least one of the input type determined by real and complex numbers, the transmit port axis representing the compressed CSI-RS port, the time axis, the frequency axis, and the rank axis may be included. Based on the above axis components, the axes of the input and output can be represented through combinations between the axes. For example, an AI channel restoration model trained based on index 0-0 may use a transmit port axis real value channel as the input and output. As another example, an AI channel restoration model trained based on index 3-2 can use complex value channels consisting of time axis, frequency axis, rank axis, and transmission port axis as input and output.

[0259] The input dimension (1003) represents the dimension used for each axis constituting the input of the AI ​​channel restoration model. The input dimension can be expressed as a value corresponding to the input / output axis (1002). Specifically, the dimension corresponding to the transmission port axis may represent the number of compressed CSI-RS ports, and, referring to FIG. 10, may have a value M1 or M2 that is smaller than the total number of CSI-RS ports, for example. The dimension corresponding to the frequency axis may be a unit for estimating the channel for the compressed CSI-RS ports. For example, when the estimated channel from all RBs is used as the input to the AI ​​channel restoration model, the dimension corresponding to the frequency axis is the number of RBs (N RB It can be ). As another example, the frequency axis dimension is N RB If channels estimated in units of subbands (SB) composed of a certain RB are used as input to an AI channel reconstruction model without being restricted to , the frequency axis dimension is the number of subbands (N SB It can be.

[0260] The dimension corresponding to the time axis can be represented as the number of channels measured by the terminal per unit time over a certain period. For example, when the terminal estimates channels in slot units, the time axis dimension is the number of slots (N slot The unit time set above is not limited to a slot and can be a subframe or a frame. Alternatively, the unit time may be set together with the input and output setting information of the AI ​​model, set separately, or predetermined.

[0261] The dimension corresponding to the Rank axis may be related to the number of receiving antenna ports used by the terminal. For example, the number of receiving antenna ports (N) of the terminal r ) can be one of {1, 2, 3, 4}, but is not limited thereto.

[0262] Similar to the input dimension (1003) described above, the output dimension (1004) represents the available dimensions for each axis constituting the output of the AI ​​channel restoration model. As described, specified dimensions may be applied to the input type axis, transmission port axis, frequency axis, time axis, and rank axis. For example, using the AI ​​channel restoration model N slot N during the slot RB When attempting to restore the M port channels measured for RBs to the entire N (≥M) port channels, the base station may indicate at least one model among 2-0, 2-1, 2-2, and 2-3 depending on the input type.

[0263] As described above, the table in FIG. 10 may be predetermined, or the contents of the table may be set to the terminal, for example, through upper layer signaling. Additionally, the terminal may report information regarding the types of inputs it can support, the types of input / output axes, input dimensions, and output dimensions to the base station, for example, as terminal capability information.

[0264] If model indications based on the index of an AI channel recovery model are not specified in the standard or are not pre-configured, the base station can identify the AI ​​channel recovery model by indicating the axis components and axis dimensions for the corresponding AI model to the terminal. One method of indicating axis components is a bitmap format in which the positions corresponding to the axes used in the input and output arrays of the AI ​​channel recovery model are marked with 1s. For example, consider the case where there are five types of axes (input type axis, time axis, frequency axis, rank axis, and transmission port axis). In the bitmap notation, the axis corresponding to a bit set to 0 indicates an axis not used as an input, while the axis corresponding to a bit set to 1 indicates an axis used as an input. Furthermore, the reverse of this technique is also applicable. For instance, if the AI ​​channel recovery model uses a compressed port channel for a single RB during a single slot as a real value input, bitmap 10001 can be used as the axis component indication. Also, N slot N during the slot RB If a compressed port channel is used as a complex value input for RBs, bitmap 01101 can be used as an axis component instruction. Along with (or separately from) the bitmap, configuration information for each axis dimension can be transmitted from the base station to the terminal. Alternatively, the axis dimensions may be predetermined.

[0265] As an example of a method for specifying another axis component, the input type axis may be set to 000, the time axis to 001, the frequency axis to 010, the rank axis to 011, and the transmission port axis to 100, and the corresponding values ​​for the components may be specified. For example, if a compressed port channel for a single RB during a single slot is used as a real value input, 000100 may be used as the axis component specification. Also, N slot N during the slot RBIf a compressed port channel for RBs is used as a complex value input, 001010100 may be used as the axis component indicator. In this case, configuration information for each axis dimension configured to be used together (or separately) with the value indicating the component may be transmitted from the base station to the terminal. Alternatively, the axis dimensions may be predetermined.

[0266] FIG. 11 is a diagram illustrating an example of the AI ​​inference process of a quantized AI-based channel restoration model (1100). When running an AI model on actual hardware or software, model quantization is generally performed. This can reduce the model size and computational load, and accelerate the operation of the neural network. For example, when an AI model is trained based on floating-point (FP) 32 bits, if the trained FP32 model is quantized into an INT8 model which is an 8-bit integer, the model size and computational load can be reduced to one-fourth.

[0267] For AI inference on a quantized AI-based channel restoration model (1100), quantization of the input and output is required. A compressed port channel according to the axis configuration indicated in Fig. 10 (1101) is a compressed port channel quantized through input quantization (1110). (1102) can be. If we look at the input quantization (1110) in the formula, the compressed port channel The elements of and, Is It satisfies. Also, quantized compressed port channel The elements of and, Is It satisfies. In this case, the element Is It can be quantized through, and the input scale (input scale, sin )silver and, input zero-point (z in )silver am.

[0268] Referring to the above formula, in order to quantize the input of an AI model, the input scale (s in ) and input zero (z in It can be seen that ) is necessary. When the base station performs training of the AI ​​channel restoration model, the base station uses the compressed port channel as input The input scale and input zeros for can be obtained. When a base station transmits a quantized AI channel reconstruction model to a terminal and the terminal performs AI inference using the transmitted model, the terminal requires an input scale and input zeros because it must perform input quantization for the compressed port channel. Therefore, the base station can inform the terminal of the input scale and input zeros to perform input quantization. The input scale and input zeros may be transmitted together with the input and output setting information of the AI ​​model, or they may be instructed separately.

[0269] When performing AI inference using a quantized compressed port channel as input, the quantized full port channel H q (1103) can be obtained. An inversely quantized total port channel H (1104) can be obtained through output de-quantization (1120) based on the obtained quantized total port channel. If we look at the output de-quantization (1120) as a formula, the quantized total port channel H q The elements of h q Let be denoted as , and let h be an element of the entire inversely quantized port channel H. In this case, element h q is h = s out (h q +z out It can be inversely quantized through ), and the output scale (s out) and output zero-point (output zero-point, z out ) is determined by the range of the value of h. Referring to the above formula, in order to inversely quantize the output of a quantized AI model, the output scale s out and output zero point z out It can be seen that this is necessary. Along with the input scale and input zero described above, the base station can transmit the output scale and output zero to the terminal. The output scale and output zero can be transmitted together with the input and output setting information of the AI ​​model, or they may be specified separately.

[0270] The quantization and inverse quantization methods related to Fig. 11 are merely examples, and the quantization method described above may be modified and used under the understanding of those skilled in the art.

[0271] FIG. 12 is a diagram illustrating an example of an AI model transmission-based CSI-RS compression transmission and reception process according to one embodiment of the present disclosure.

[0272] Referring to FIG. 12, a base station (1202) can train an AI channel restoration model (which can be used interchangeably with an AI model) for CSI-RS compressed transmission and reception (1210). The base station can receive a channel for all ports from a terminal for data collection, and the base station can train an AI model using the compressed port channel as input and the channel for all ports as output through the collected channel. As a result of the training, the base station can obtain weight values ​​within the structure of the AI ​​model used, and the fact that the base station can obtain appropriate weight values ​​is equivalent to the fact that the base station can obtain an appropriate AI channel restoration model. At this time, the input dimension and / or output dimension may vary depending on the communication environment. For example, if the base station operates rank 2 and rank 4 models, the base station can perform training by configuring the axis and axis dimensions according to the rank, or if the correlation between the time axis and frequency axis is high, the base station can train the AI ​​model by increasing the number of slots for the time axis dimension and the frequency axis dimension or by increasing the number of RBs. In addition, the content of training may vary depending on the metric used to measure AI model performance; for example, if a model with low complexity needs to be used, the base station may train by reducing the axis dimensions of the AI ​​model. As described above, the training of the base station's AI model may vary depending on the situation, such as the communication environment, channel conditions, and the performance of the base station and terminal, or according to the definition of the standard.

[0273] The base station may transmit the trained AI channel restoration model to the terminal (1201) (1220). Transmission of the AI ​​channel restoration model may include cases where the AI ​​model structure is specified and the base station transmits weights to the terminal, or cases where information about the AI ​​model is not specified and the base station transmits the AI ​​model structure and weights. The base station may transmit meta data regarding the AI ​​channel restoration model (1230). Steps 1220 and 1230 may be performed separately or together as illustrated. The meta data regarding the transmitted AI channel restoration model may include at least one of the axis components, axis dimensions, and quantization-related information described above. Transmission of meta data regarding the AI ​​channel restoration model may be based on the axis components, axis dimensions, and quantization-related parameters defined in the standard (e.g., indicated by an index as in FIG. 10). Additionally, if not specified in the standard, the base station may transmit the information by directly indicating it.

[0274] A base station (1202) can transmit compressed CSI-RS to a terminal (1201) (1240). The base station can compress the CSI-RS based on CSI-RS configuration information and CSI-RS compression configuration information and transmit it to the terminal. The terminal receives the compressed CSI-RS and checks the compressed CSI-RS port channel. The terminal can restore the channel corresponding to the entire CSI-RS port based on the transmitted AI channel restoration model (1250). The compressed CSI-RS port channel and the entire CSI-RS port channel may be spatial domain channels based on meta-information, and may be spatial-frequency domain channels or spatial-frequency-time domain channels.

[0275] The terminal (1201) feeds back channel state information for the entire restored CSI-RS port channel to the base station (1202) (1260). The channel state information may be channel state information for the entire CSI-RS port, or it may be channel state information generated according to port information set by the base station. The channel state information generated according to the port information set by the base station may be channel state information for some CSI-RS ports, rather than channel state information for the entire CSI-RS port. The channel state information may include at least one of a rank indicator (RI), a precoding matrix indicator (PMI), and a channel quality indicator (CQI). The channel state information is not limited to these examples, and information indicating the restored CSI-RS port channel may correspond to the channel state information.

[0276] 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.

[0277] <2nd Example>

[0278] A second embodiment relates to a method utilizing the generalization of inputs and outputs in an AI model transmission-based CSI-RS compression method according to one embodiment of the present disclosure mentioned in FIG. 12.

[0279] As illustrated in FIG. 10 above, the base station can use various combinations of input and output configurations for the AI ​​channel restoration model. For example, in the case of an AI channel restoration model that takes a real-valued 128-port channel measured for 2 RBs during one slot as input and outputs a real-valued 256-port channel, the base station can use input dimensions [2,2,128] and output dimensions [2,2,256] based on index 1-0 of FIG. 10. However, if all available combinations of axis dimensions are trained for each axis component, the training overhead of the base station and the transmission overhead of the AI ​​model may increase significantly, and life-cycle management (LCM) for the AI ​​model may become very complex. To address this, the base station can use a generalized AI model capable of operating on multiple combinations. For example, it can be utilized even when the AI ​​channel restoration model that takes a compressed 128-port channel as input and outputs a 256-port channel in the above example uses a compressed 64-port channel as input. In other words, the AI ​​channel restoration model in the above example can use both [2,2,64] and [2,2,128] dimensional arrays as input. By using multiple axis-dimensional arrays as input and output, the number of AI channel restoration models that need to be trained can be reduced, and the overhead of training and AI model transmission can be significantly reduced.

[0280] FIGS. 13a and 13b illustrate an example of performing CSI-RS compression using AI model generalization. FIG. 13a illustrates an example in which a compressed CSI-RS port channel used as input to an AI channel restoration model is composed of a frequency axis (1300) and a transmission port axis (1301), and the entire CSI-RS port channel used as output is also composed of a frequency axis and a transmission port axis. As illustrated in FIG. 12, based on meta-information regarding the AI ​​channel restoration model, the dimension of the input array is [N RB , M] (1310), the dimension of the output array is [N RB ,N] (1311). For example, if 52 RB is instructed to take 128 port channels as input and output 256 port channels, the dimension of the input array is [N RB , M]=[52, 128], the dimension of the output array is [N RB ,N]=[52, 256].

[0281] The base station can use a generalized AI channel reconstruction model to direct AI inference for inputs and outputs corresponding to the axis dimension directed to the terminal, and for inputs and outputs having dimensions smaller than the directed axis dimension. If, when configuring the inputs of a generalizable AI model, the base station does not follow the configuration method used during training, the multiplication between the AI ​​model's weights and the input array is not performed correctly, which can significantly degrade AI inference performance. Specifically, in the example of FIG. 9a, considering the transmission port axis, a number of port values ​​M1 (less than the directed transmission port axis dimension (M) <M)을 가지는 [N RB Using an input array (1320) of the dimensions [ , M1], a small number of total port values ​​N1( <N)을 가지는 [N RB It may be instructed to obtain an output array (1321) of the dimension N1].

[0282] When a base station intends to use a compressed M1 port channel as input to an AI channel restoration model, appropriate input pre-processing is required because it is smaller than the input dimension (M) of the configured AI channel restoration model. An example of the above input pre-processing may be a zero padding method. When constructing an M-dimensional input using an M1 port channel, an M-dimensional input can be obtained by a zero padding method in which zero values ​​corresponding to M-M1 ports are added to the M1 port channel (1322). Similar to the input pre-processing method described above, output post-processing is required when restoring a channel for N1 restoration ports, which is less than the total number of ports N. As an example of the above output post-processing, a final N1 port channel can be obtained by selecting values ​​corresponding to N1 ports from the channel values ​​corresponding to N ports output (1321).

[0283] As another example, considering the frequency axis, the indicated frequency axis dimension (N RB A number of N' smaller than ) RB ( <N RB The M port channel obtained from ) RB is [N' RB It is a dimensional array [N' RB An M-port channel of a dimensional array [ , M] can be used as input (1330). For the input dimensions set above, the indicated N RB Because fewer RBs are used, N RB -N' RB N using a zero-padding method that adds 0 values ​​corresponding to RBs to the frequency axis. RB A dimensional input can be obtained (1332). Also, considering the output dimension, N RB Among the output values ​​of the dimension, N' RB By selecting values ​​corresponding to the dimensions, the final N' RBA port channel corresponding to RB can be obtained (1331).

[0284] Each mode of FIG. 13a is merely an example, and the content of the present disclosure is not limited by such example. Also, the methods of pre-processing and post-processing described above are merely examples and do not exclude cases where other processing methods are used.

[0285] FIG. 13b is a diagram illustrating an example of an input and output configuration that a base station can direct to a terminal when inferring a generalized AI model using fewer ports than the indicated transmission port axis dimension.

[0286] It is assumed that the base station has transmitted an AI model that takes as input channels corresponding to the total number of ports (N) initially specified to the terminal compressed port number (M) and outputs channels corresponding to the total number of ports (N). The AI ​​model transmitted by the base station can use a generalization function to restore N1, N2, N3, and N4 port channels, which are fewer than N, taking as input port channels that are fewer than M (M1, M2, M3, M4).

[0287] As shown in FIG. 13b, the base station can indicate to the terminal the zero padding location for the input and the location for the output value. For example, in the case of generalized AI model inference that restores an N1-port channel from an M1-port channel as input, the locations of the input and output can be indicated based on Mode 1. Specifically, the input M1-port channel can be indicated as the location corresponding to the first M1 ports in the initially indicated M-port channel input. From the perspective of the output, the output N1-port channel value can be indicated as the location corresponding to the first N1 ports in the initially indicated N-port channel output.

[0288] As another example, in the case of generalized AI model inference that restores an N4-port channel using an M4-port channel as input, the locations of the input and output may be indicated based on Mode 4. The input M4-port channel may be indicated to be located at an even-numbered element in the initially indicated M-port channel. From the perspective of the output, the output N4-port channel value may be indicated to be located at an even-numbered element in the initially indicated N-port channel output. Each mode of FIG. 13 is merely an example, and the content of the present disclosure is not limited by such example.

[0289] <3rd Example>

[0290] A third embodiment relates to a method utilizing time-axis CSI-RS port aggregation according to an embodiment of the present disclosure mentioned in FIGS. 9 and 10. FIGS. 14a and 14b illustrate an example of aggregating CSI-RS ports along the time axis, and FIG. 14c illustrates an example of an input configuration when aggregating ports along the time axis.

[0291] FIG. 14a illustrates an example of aggregating CSI-RS ports along the time axis. In FIG. 14a to 14c, a total of N CSI-RS ports are compressed into M (≤N) CSI-RS ports, and it is assumed that a terminal measures the M1 port channel during one CSI-RS cycle. Additionally, it is assumed that the M compressed CSI-RS port channels can be obtained through two CSI-RS cycles based on time axis port aggregation (i.e., M=2M1).

[0292] For example, an M1 port channel (1410) measured in the (t-1)th CSI-RS period (1400) and an M1 port channel (1411) measured in the tth CSI-RS period (1401) can be configured into an M port channel through port aggregation. Similarly, an M1 port channel (1411) measured in the tth CSI-RS period (1401) and an M1 port channel (1412) measured in the (t+1)th CSI-RS period (1402) can be configured into an M port channel through port aggregation. The input axis configuration of the measured M1 port channel is [input type, time axis, transmission port axis], and assuming it is a real value channel, the channel measured in one CSI-RS period becomes [2,1,M1].

[0293] When utilizing time-axis port aggregation, input settings for multiple measured M1 port channels are required. These input settings may vary depending on the location of the M1 port instructed by the base station to the terminal over multiple CSI-RS cycles, and the base station may arbitrarily instruct the input settings to enhance channel recovery performance.

[0294] For example, looking at configuration 1 (1420), when port aggregating M1 port channels (1410) measured in the (t-1)th CSI-RS period (1400) and M1 port channels (1411) measured in the tth CSI-RS period (1401), the input configuration may be instructed to concatenate the two M1 port channels with respect to the time axis to obtain an aggregated port channel (1421) having [2,2,M1] dimensions. Additionally, the axis on which the concatenation is performed, as well as the concatenation order of multiple M1 port channels, may be instructed. When comparing Configuration 1 (1420) and Configuration 2 (1430), both configurations stack two M1 port channels along the time axis, but in Configuration 1, the t-th M1 port channel is placed after the (t-1)-th M1 port channel (1421), and in Configuration 2, the (t-1)-th M1 port channel is placed after the t-th M1 port channel (1431). The input configuration base station that stacks channels measured along the time axis may have instructed the terminal to use the configuration used during training.

[0295] FIG. 14b illustrates another example of aggregating CSI-RS ports along the time axis. When utilizing time axis port aggregation, stacking along the transmit port axis based on multiple measured M1 port channels may be used. For example, looking at configuration 3 (1440), when a terminal aggregates M1 port channel (1410) measured in the (t-1)th CSI-RS period and M1 port channel (1411) measured in the tth CSI-RS period (1401), the input settings may be instructed to stack the two M1 port channels along the transmit port axis to obtain an aggregated port channel (1441) having dimensions [2,1,2M1(=M)]. In the transmit port axis stacking, as in the time axis stacking, the order of multiple M1 port channels may be considered. For example, in the case of configuration 4 (1450), compared to configuration 3 (1440), the order of the (t-1)th M1 port channel and the tth M1 port channel is reversed (1451).

[0296] The above configuration can be initially instructed by the base station to the terminal as meta-information for AI model transmission, and aperioditic and semi-persistent instructions can be performed as instructions for aggregating port channels according to the CSI-RS port information set by the base station. For example, if the base station changes the CSI-RS port location measured according to the CSI-RS period, the stacking axis and stacking order may be changed according to the changed port location. As a specific example, the terminal measures a port for polarization in one direction among the cross-polarized ports during the t-1th CSI-RS period and periodically measures a port for polarization in the other direction during the tth CSI-RS period, but the base station may aperioditically change the polarization direction of the transmitted CSI-RS port to the opposite. In this case, when intending to use the channel according to the changed port direction as input for the AI ​​channel restoration model, a change in the stacking order must be instructed.

[0297] FIG. 14c illustrates an example of a stacking axis (1460) and a stacking order (1470) for multiple compressed port channels when using time-axis port aggregation. As described in FIG. 14a and FIG. 14b, when a terminal performs stacking based on an M1 port channel (1410) measured in the (t-1)th CSI-RS period and an M1 port channel (1411) measured in the t-th CSI-RS period (1401), stacking for the time axis and stacking for the transmission port axis may be used. Additionally, the order of the measured port channels can be defined based on the axis for performing stacking. A mode index (1480) can be constructed by combining the stacking axis and the stacking order, and the base station may indicate the mode index according to the aggregation method intended for use by the terminal. The mode index and the information indicated by the mode index in FIG. 14c are merely examples, and it is possible to indicate the aggregation axis and order in other ways.

[0298] The mode index (or aggregation axis and order) defined above may be initially indicated as meta-information for AI model transmission, and aperioditic and semi-persistent instructions may be performed as mode instructions for port channel aggregation according to the CSI-RS port information set by the base station. For example, if the base station aperioditically changes the CSI-RS port location measured during each CSI-RS cycle, the base station may perform aperioditic instructions to change the stacking order for appropriate input and output configuration for the terminal. When the mode index changes according to the set CSI-RS port information, the nrofPorts, density, and freqBand items (CSI-FrequencyOccupation) in the CSI-RS-ResourceMapping of the RRC parameters may change together. For example, if the number of M1 ports measured in multiple CSI-RS cycles set by the base station is changed by half, the number of CSI-RS ports measured in a single CSI-RS cycle changes. In other words, since nrofPorts changes, the density can be configured to change from one to dot5, for example. Additionally, in the CSI-FrequencyOccupation parameter, nrofRBs can be halved, and startingRB can be newly configured. The above RRC parameters can be configured as MAC-CE along with Mode. For example, specific parameters can be configured for RRC signaling while others are configured for MAC-CE, or it is possible for one of multiple configuration information items configured for RRC signaling to be indicated as MAC-CE.

[0299] <Fourth Example>

[0300] The fourth embodiment relates to a method utilizing frequency axis CSI-RS port aggregation according to one embodiment of the present disclosure mentioned in FIG. 9 and FIG. 10. FIG. 15a is a diagram illustrating an example of aggregating CSI-RS ports along a frequency axis, and FIG. 15b is a diagram illustrating an example of an input configuration when aggregating ports along a frequency axis.

[0301] In FIG. 15a and 15b, it is assumed that a base station compresses a total of N CSI-RS ports into M (≤N) CSI-RS ports, and that an M1 port channel is measured at one RB. Additionally, it is assumed that the M compressed CSI-RS port channels can be obtained through M1 port channel measurements corresponding to 4 RBs (RB 0 corresponds to the first RB, RB 1 to the second RB, RB 2 to the third RB, and RB 3 to the fourth RB) based on frequency axis port aggregation (i.e., M=4M1). For example, 4 M1 port channels (1500) measured at RB 0, RB 1, RB 2, and RB 3 can be configured into M port channels through frequency axis port aggregation. The input axis settings of the M1 port channel measured above are [input type, frequency axis, transmission port axis], and assuming it is a real value channel, the channel measured at one RB becomes [2,1,M1].

[0302] When performing AI inference using frequency axis port aggregation, input settings for multiple measured M1 port channels are required. The above input settings may vary depending on the location of the M1 port instructed by the base station to the terminal across multiple RBs, and the base station may arbitrarily instruct the input configuration to improve channel recovery performance.

[0303] For example, looking at configuration 1 (1510), when performing port aggregation with four M1 port channels (1411) measured from RB 0 to RB 3, the input configuration may be instructed to stack the four M1 port channels with respect to the frequency axis to obtain an aggregated port channel (1511) having [2,4,M1] dimensions. In addition, not only the axis for performing stacking but also the stacking order of multiple M1 port channels with respect to the indicated stacking axis may be instructed. Comparing configuration 1 (1510) and configuration 2 (1520), both configurations stack four M1 port channels with respect to the frequency axis, but in configuration 1, the M1 port channels are arranged in the order RB 0, RB 1, RB 2, RB 3 (1511), and in configuration 2, the M1 port channels are arranged in the order RB 3, RB 2, RB 1, RB 0 (1521). The input setting for stacking channels measured with respect to the frequency axis may be the configuration used by the base station during training instructed to the terminal.

[0304] When utilizing frequency axis port aggregation, stacking on a transmit port axis based on multiple measured M1 port channels may be used. For example, looking at configuration 3 (1530), when the terminal port aggregates M1 port channels (1500) measured at RB 0, RB 1, RB 2, and RB 3, the input settings may be instructed to stack the four M1 port channels on the transmit port axis to obtain an aggregated port channel (1531) having dimensions [2, 1, 4M1(=M)]. Similar to frequency axis stacking, the order of multiple M1 port channels may be considered for transmit port axis stacking. For example, in the case of configuration 4 (1540), compared to configuration 3 (1530), the channels are stacked in the reverse order of RB 3, RB 2, RB 1, and RB 0 (1541).

[0305] The above configuration can be initially instructed by the base station to the terminal as meta-information for AI model transmission, and aperioditic and semi-persistent instructions can be performed as instructions for aggregating port channels according to CSI-RS port information set by the base station. For example, if the base station changes the CSI-RS port number (or location on the antenna element, which can be used interchangeably) transmitted according to RB 0, RB 1, RB 2, and RB 3, the stacking axis and stacking order may be changed according to the changed port number. As a specific example, if the base station periodically transmits CSI-RS according to the CSI-RS port number in the order of RB 0, RB 1, RB 2, and RB 3, and then changes the port number transmitted in the order of RB 3, RB 2, RB 1, and RB 0 considering frequency correlation, the base station may instruct a change in the stacking order according to the changed port number to ensure proper input configuration of the AI ​​channel recovery model.

[0306] FIG. 15b illustrates an example of a stacking axis (1550) and a stacking order (1560) for multiple compressed port channels when using frequency axis port aggregation. As described in FIG. 15a, when a terminal performs stacking based on M1 port channels (1500) measured at multiple RBs, stacking can be performed on the frequency axis and stacking on the transmission port axis. Additionally, the order of the measured port channels can be defined based on the axis on which stacking is performed. A mode index (1570) can be formed by combining the stacking axis and the stacking order, and the base station can indicate the mode index according to the aggregation method intended for use by the terminal. For example, mode 1-1, mode 1-2, mode 1-3, and mode 1-4 indicate the stacking axis as the frequency axis and have different stacking orders. In Mode 1-1, frequency axis stacking is performed in the order from the lowest RB to the highest RB in the PRB mapping sequence, and in Mode 1-2, frequency axis stacking is performed in the order from the highest RB to the lowest RB. Additionally, in Mode 1-3, odd-numbered RBs are stacked first, and even-numbered RBs are stacked after the odd-numbered RBs. Finally, in Mode 1-4, even-numbered RBs are stacked first, and odd-numbered RBs are stacked after the even-numbered RBs. The mode index and the information indicated by the mode index in Fig. 15b are merely examples, and it is possible to indicate the stacking axis and order in other ways.

[0307] The above-defined mode index (or stacking axis and order) can be initially indicated as meta-information for AI model transmission, and aperioditic or semi-persistent instructions can be performed according to the CSI-RS port information set by the base station. When the Mode changes according to the above-set CSI-RS port information, the nrofPorts, density, and freqBand items (CSI-FrequencyOccupation) in the CSI-RS-ResourceMapping of the RRC parameters may be changed together. For example, if the number of M1 ports measured from multiple RBs set by the base station is changed by half, the density may be changed from one to dot5. Additionally, in the CSI-FrequencyOccupation parameter, nrofRBs may be reduced by half, and a new startingRB may be set. The above-mentioned RRC parameters can be set as MAC-CE along with the mode. For example, certain parameters may be set to RRC signaling and other parameters to MAC-CE, or it is possible for one of the multiple configuration information sets to RRC signaling to be indicated as MAC-CE.

[0308] FIG. 16 illustrates an example of a change in the input configuration of an AI model according to a change in the measured port for each RB during the AI ​​inference process of a frequency axis port aggregation-based CSI-RS compression method. In FIG. 16, stacking was performed along the frequency axis based on M1 port channels (1600) measured at RB 0, RB 1, RB 2, and RB 3. The input settings indicated by the base station may vary depending on the port location measured for each RB, as illustrated in the example of FIG. 16. FIG. 16 assumes that the entire 16 port channels are restored using the compressed 8 port channels as input to the AI, and assumes that the terminal measures 2 port channels per RB and then aggregates 4 RBs to form an 8 port channel.

[0309] When performing the p-th AI inference (1601) in FIG. 16, the base station instructed the terminal to use mode 1-1 of FIG. 15b as the AI ​​model input configuration according to the CSI-RS port locations measured from RB 0 to RB 3 (1605). As described, based on mode 1-1, the terminal performs stacking along the frequency axis with the PRB mapping order from the lowest RB to the highest RB as input, so the frequency axis can be configured in the order [RB 0, RB 1, RB 2, RB 3] (1610).

[0310] When the base station performs the qth AI inference (1602) by changing the CSI-RS port location used during the pth AI inference, the base station may instruct the input settings based on the measurement (1603) after changing the CSI-RS port. The above change of the CSI-RS port may be performed to gain performance in situations where frequency axis selectivity is severe or the antenna port correlation between RBs changes during fading. Since the correlation between antenna ports can be learned as one of the AI ​​model implementation methods for the CSI-RS compression method, the performance obtained during training can be maintained by configuring the input in the same way as the antenna port location used during training. Therefore, in the qth AI inference (1602) in FIG. 16, the input configuration can be instructed to mode 1-2 considering the antenna port location (1606). Based on mode 1-2 of FIG. 15b, if the terminal performs stacking on the frequency axis with the PRB mapping order from the highest RB to the lowest RB as input, the frequency axis can be configured in the order [RB 3, RB 2, RB 1, RB 0] (1611).

[0311] FIG. 17 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0312] Referring to FIG. 17, the terminal may include a transceiver (1701), a memory (1702), and a processor (1703). 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. In addition, at least some or all of the transceiver (1701), the memory (1702), and the processor (1703) may be implemented in the form of a single chip.

[0313] In one embodiment, the transceiver (1701) can transmit and receive signals with a base station. The above-described signal may include control information and data. To this end, the transceiver (1701) 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 the frequency. Additionally, the transceiver (1701) can receive a signal through a wireless channel and output it to a processor (1703), and transmit the signal output from the processor (1703) through a wireless channel.

[0314] In one embodiment, the memory (1702) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1202) may store control information or data included in signals transmitted and received by the terminal. The memory (1702) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1702) may be composed of multiple memories. According to one embodiment, the memory (1702) may store a program for executing an operation for power saving of the terminal.

[0315] In one embodiment, the processor (1703) can control a series of processes that allow the terminal to operate according to the embodiments of the present disclosure described above. In one embodiment, the processor (1703) can control an operation to estimate the entire channel based on the setting information by executing a program stored in memory (1702), receiving information from a base station such as a setting for CSI-RS measurement and a setting for aggregating the measured CSI-RS channels.

[0316] FIG. 18 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0317] Referring to FIG. 18, the base station may include a transceiver (1801), a memory (1802), and a processor (1803). However, the components of the base station are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. In addition, the transceiver (1801), the memory (1802), and the processor (1803) may be implemented in the form of a single chip.

[0318] In one embodiment, the transceiver (1801) can transmit and receive signals with a terminal. The above-described signal may include control information and data. To this end, the transceiver (1801) 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 the frequency. Additionally, the transceiver (1801) may receive a signal through a wireless channel and output it to a processor (1803), and transmit the signal output from the processor (1803) through a wireless channel.

[0319] In one embodiment, the memory (1802) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1802) may store control information or data included in signals transmitted and received by the terminal. The memory (1802) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1802) may be composed of multiple memories. According to one embodiment, the memory (1802) may store a program for executing an operation for power saving of the terminal.

[0320] In one embodiment, the processor (1803) can control a series of processes to enable the base station to operate according to the embodiments of the present disclosure described above. In one embodiment, the processor (1803) can control an operation to receive information such as settings for CSI-RS measurement and settings for aggregating measured CSI-RS channels from a terminal by executing a program stored in memory (1802), and to estimate the entire channel related to the settings information.

[0321] Methods according to the claims or embodiments described in the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0322] When implemented in software, a computer-readable storage medium or computer program product storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium or computer program product 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.

[0323] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), magnetic disc storage devices, CD-ROM (Compact Disc-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.

[0324] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), 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.

[0325] In the specific embodiments of the present disclosure described above, the components included in the present disclosure 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, 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.

[0326] 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 together as needed. For example, parts of one embodiment of the present disclosure and another embodiment may be combined to operate a base station and a terminal. In addition, the embodiments of the present disclosure are applicable to other communication systems, and other variations based on the technical concept of the embodiments may also be possible. For example, the embodiments may be applied to LTE systems, 5G or NR systems, etc.

Claims

1. A method performed by a terminal in a communication system, A step of receiving configuration information for an artificial intelligence model from a base station, wherein the configuration information includes input and output related information for the artificial intelligence model; A step of receiving compressed information related to a channel state information reference signal (CSI-RS) from the base station; A step of receiving a CSI-RS corresponding to a compressed CSI-RS port from the base station; A step of restoring the compressed CSI-RS port channel to the entire CSI-RS port channel based on the input and output information of the artificial intelligence model and the compressed CSI-RS port; and A method characterized by including the step of reporting channel status information for the entire restored CSI-RS port channel to the base station.

2. In paragraph 1, the input and output related information includes an input axis setting, and the input axis setting includes at least one of an input type axis, a time axis, a frequency axis, a compressed CSI-RS port axis, and a rank axis. A method characterized in that the above-described compressed CSI-RS port channel includes values ​​according to the above-described input axis setting.

3. In Paragraph 2, The values ​​according to the above input axis settings are quantized values ​​based on the input scale and input zero point, A method characterized by the above input scale and input zero point being set from the base station.

4. In Paragraph 1, A method characterized in that the above-mentioned compressed CSI-RS port channel corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of CSI-RS cycles, or corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of frequency resource units.

5. In a method performed by a base station in a communication system, A step of transmitting configuration information for an artificial intelligence model to a terminal, wherein the configuration information includes information related to input and output for the artificial intelligence model; A step of transmitting compressed information related to a channel state information reference signal (CSI-RS) to the above terminal; A step of transmitting a CSI-RS corresponding to a compressed CSI-RS port to the above terminal; and The method includes the step of receiving channel status information for the entire CSI-RS port channel from the terminal, A method characterized in that the entire CSI-RS port channel is restored based on information related to the input and output of the artificial intelligence model and the compressed CSI-RS port.

6. In paragraph 5, the input and output related information includes an input axis setting, and the input axis setting includes at least one of an input type axis, a time axis, a frequency axis, a compressed CSI-RS port axis, and a rank axis. A method characterized in that the above-described compressed CSI-RS port channel includes values ​​according to the above-described input axis setting.

7. In Paragraph 6, The values ​​according to the above input axis settings are quantized values ​​based on the input scale and input zero point, A method characterized by the above input scale and input zero point being set from the base station.

8. In Paragraph 5, A method characterized in that the above-mentioned compressed CSI-RS port channel corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of CSI-RS cycles, or corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of frequency resource units.

9. In 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 an artificial intelligence model from a base station, and the configuration information includes information related to input and output for the artificial intelligence model. Receives compressed information related to a channel state information reference signal (CSI-RS) from the above base station, and Receives a CSI-RS corresponding to the compressed CSI-RS port from the above base station, and Based on the input and output information of the above artificial intelligence model and the above compressed CSI-RS port, the compressed CSI-RS port channel is restored to the entire CSI-RS port channel, and A terminal characterized by including: a memory storing a command to report channel status information for the entire restored CSI-RS port channel to the base station.

10. In paragraph 9, the input and output related information includes an input axis setting, and the input axis setting includes at least one of an input type axis, a time axis, a frequency axis, a compressed CSI-RS port axis, and a rank axis. A terminal characterized in that the above-mentioned compressed CSI-RS port channel includes values ​​according to the above-mentioned input axis setting.

11. In Paragraph 10, The values ​​according to the above input axis settings are quantized values ​​based on the input scale and input zero point, A terminal characterized by the above input scale and input zero point being set from the base station.

12. In Paragraph 9, A terminal characterized in that the above-mentioned compressed CSI-RS port channel corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of CSI-RS cycles, or corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of frequency resource units.

13. In 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: Configuration information for an artificial intelligence model is transmitted to a terminal, and said configuration information includes information related to input and output for said artificial intelligence model, and Compression information related to the channel state information reference signal (CSI-RS) is transmitted to the above terminal, and Transmit the CSI-RS corresponding to the compressed CSI-RS port to the above terminal, and A memory storing a command to receive channel status information for all CSI-RS port channels from the terminal; including A base station characterized in that the entire CSI-RS port channel is restored based on information related to the input and output of the artificial intelligence model and the compressed CSI-RS port.

14. In paragraph 13, the input and output related information includes an input axis setting, and the input axis setting includes at least one of an input type axis, a time axis, a frequency axis, a compressed CSI-RS port axis, and a rank axis. A base station characterized in that the above-mentioned compressed CSI-RS port channel includes values ​​according to the above-mentioned input axis setting.

15. In Paragraph 14, The values ​​according to the above input axis settings are quantized values ​​based on the input scale and input zero, and the input scale and input zero are set by the base station, and or, A base station characterized in that the above-mentioned compressed CSI-RS port channel corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of CSI-RS cycles, or corresponds to an aggregation of CSI-RS port channels measured in each of a plurality of frequency resource units.

Images