Generalization method and device for compressing and transmitting / receiving CSI-rs on basis of artificial intelligence partial model in wireless communication system

Abstract

The present disclosure relates to a 5G-A or 6G communication system for supporting a higher data transmission rate higher than 5G NR. An operation method of a terminal in a wireless communication system according to one embodiment disclosed herein may comprise the steps of: receiving, from a base station, configuration information about at least one artificial intelligence (AI) partial model, which is a part of a whole AI model for reporting channel state information (CSI) in which weight updating is performed; updating the AI partial model on the basis of weight information of the AI partial model and indication information of the AI partial model included in the configuration information about the at least one AI partial model; and reporting, to the base station, the CSI obtained by using the whole AI model including the updated AI partial model.

Description

Generalized method and apparatus for compressing and transmitting / receiving CSI-RS based on an artificial intelligence partial model in a wireless communication system

[0001] The present disclosure relates to a wireless communication system, and more specifically, to a generalization method and apparatus based on an artificial intelligence partial model transmission for CSI-RS compression 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 included beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands; support for various numerologies (such as operating multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources; initial access techniques to support multi-beam transmission and broadband; the definition and operation of Band-Width Parts (BWP); Low Density Parity Check (LDPC) codes for high-volume data transmission; new channel coding methods such as Polar Codes for the reliable transmission of control information; and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

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

[0005] In addition, standardization is underway in the field of wireless interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand 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) to incorporate 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 generalizing CSI-RS (channel state information-reference signal) compression by transmitting a portion of an artificial intelligence (AI) model transmitted from a base station to a terminal in a wireless communication system. Furthermore, the present disclosure provides a method and apparatus for reducing the overhead consumed in transmitting an artificial intelligence model for CSI-RS compression in an AI-based mobile 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] A method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure may include: receiving configuration information regarding at least one AI part model, which is a part of an artificial intelligence (AI) model for reporting channel state information (CSI) from a base station, wherein weight updates are performed in the AI ​​part model; updating the AI ​​part model based on instruction information of the AI ​​part model and weight information of the AI ​​part model included in the configuration information regarding at least one AI part model; and reporting the CSI obtained using the artificial intelligence model including the updated AI part model to the base station.

[0011] FIG. 1 is a diagram illustrating the basic structure of a time-frequency domain, which is a wireless resource domain in which data or a control channel is transmitted in a 5G wireless communication system according to one embodiment of the present disclosure.

[0012] FIG. 2 is a drawing illustrating an example of a slot structure used in a 5G wireless communication system according to one embodiment of the present disclosure.

[0013] FIG. 3 is a diagram illustrating an example of a setting for a bandwidth part (BWP) of a 5G wireless communication system according to one embodiment of the present disclosure.

[0014] FIG. 4 is a diagram illustrating an example of a set of control resources to which a downlink control channel is transmitted in a 5G wireless communication system according to one embodiment of the present disclosure.

[0015] FIG. 5 is a diagram illustrating the structure of a downlink control channel of a 5G wireless communication system according to one embodiment of the present disclosure.

[0016] Figure 6 is a diagram illustrating an example of a non-periodic CSI reporting method in a 5G wireless communication system.

[0017] FIG. 7 is a diagram illustrating the concept of CSI-RS compression for realizing CSI-RS overhead reduction applied to various embodiments of the present disclosure.

[0018] FIG. 8 is a diagram illustrating the concepts of an AI full model and an AI partial model applied to various embodiments of the present disclosure.

[0019] FIG. 9a is a diagram illustrating AI whole model transfer-based generalization applied to various embodiments of the present disclosure.

[0020] FIG. 9b is a diagram illustrating an AI partial model transfer-based generalization applied to various embodiments of the present disclosure.

[0021] FIG. 9c is a diagram illustrating generalization based on pre-loaded AI models and AI partial model transfers applied to various embodiments of the present disclosure.

[0022] FIG. 10a is a diagram illustrating the AI ​​functional block and layer-based structure of an AI full model for CSI-RS compression applied to various embodiments of the present disclosure.

[0023] Figure 10b is a diagram of a residual network as an example of an AI functional block and layer-based AI overall model configuration.

[0024] FIG. 11a is a diagram illustrating block indexing of an AI functional block-based AI partial model according to one embodiment of the present disclosure.

[0025] FIG. 11b is a diagram illustrating layer indexing of an AI layer-based AI partial model according to one embodiment of the present disclosure.

[0026] FIG. 12 is a diagram illustrating the passage of time according to various embodiments of the present disclosure, including AI partial model transmission, AI model update, and activation of the updated AI model.

[0027] FIG. 13a is a diagram illustrating the update and activation times of an AI model for CSI-RS compression according to one embodiment of the present disclosure.

[0028] FIG. 13b is a diagram illustrating the update and activation times of an AI model for CSI-RS compression according to one embodiment of the present disclosure.

[0029] FIG. 14a is a diagram illustrating terminal operation for CSI reporting during the update and activation time of an AI model according to one embodiment of the present disclosure.

[0030] FIG. 14b is a diagram illustrating terminal operation for CSI reporting during the update and activation time of an AI model according to one embodiment of the present disclosure.

[0031] FIG. 14c is a diagram illustrating terminal operation for CSI reporting during the update and activation time of an AI model according to one embodiment of the present disclosure.

[0032] FIG. 15 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0033] FIG. 16 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0034] For convenience of explanation, devices not directly related to the present disclosure may be omitted from illustration and description.

[0035] A method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure may include: receiving configuration information regarding at least one AI part model, which is a part of an artificial intelligence (AI) model for reporting channel state information (CSI) from a base station, wherein weight updates are performed in the AI ​​part model; updating the AI ​​part model based on instruction information of the AI ​​part model and weight information of the AI ​​part model included in the configuration information regarding the at least one AI part model; and reporting the CSI obtained using the artificial intelligence model including the updated AI part model to the base station.

[0036] In a method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure, the instruction information of an AI partial model includes an index of each of some AI functional blocks among a plurality of AI functional blocks constituting the entire AI model, and the weight information of the AI ​​partial model may include a weight corresponding to each index of some AI functional blocks.

[0037] In a method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure, the instruction information of an AI partial model includes an index of each of some layers among a plurality of layers constituting the entire AI model, the weight information of the AI ​​partial model includes a weight corresponding to each index of some layers, and the setting information regarding at least one AI partial model may include at least one activation function information for some layers.

[0038] A method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure may further include: receiving a DCI indicating one of a plurality of AI part models when setting information regarding at least one AI part model includes instruction information of a plurality of AI part models; and identifying an AI part model among a plurality of AI part models based on the DCI.

[0039] A method of operation of a terminal in a wireless communication system according to one embodiment of the present disclosure further comprises the step of transmitting a HARQ-ACK to a base station for receiving configuration information regarding at least one AI sub-model, and the step of reporting a CSI to the base station is the time required from the time of transmitting the HARQ-ACK until the updated AI sub-model is activated and capable of inference. Based on this, CSI can be reported to the base station.

[0040] In a method of operating a terminal in a wireless communication system according to one embodiment of the present disclosure, It can be defined based on the size and complexity of the AI ​​partial model, or as the ratio of the time the AI ​​partial model occupies to the time required for updating, deactivating, and activating weights for the entire AI model.

[0041] In a method of operating a terminal in a wireless communication system according to one embodiment of the present disclosure, CSI reporting may not be performed during this time.

[0042] A method of operation of a base station in a wireless communication system according to one embodiment of the present disclosure comprises: transmitting configuration information regarding at least one AI part model, which is a part of an overall AI model for CSI reporting, to a terminal; and receiving a CSI obtained from the terminal using an overall AI model including an AI part model updated based on the configuration information regarding at least one AI part model, wherein the AI ​​part model may be updated at the terminal based on the instruction information of the AI ​​part model and the weight information of the AI ​​part model included in the configuration information regarding at least one AI part model.

[0043] In a wireless communication system according to one embodiment of the present disclosure, a terminal comprises: a transceiver; and at least one processor connected to the transceiver. The at least one processor receives configuration information regarding at least one AI partial model, which is a part of an overall AI model for CSI reporting, from a base station, and updates the AI ​​partial model based on instruction information of the AI ​​partial model and weight information of the AI ​​partial model included in the configuration information regarding the at least one AI partial model, and can report a CSI obtained using the overall AI model including the updated AI partial model to the base station.

[0044] In a wireless communication system according to one embodiment of the present disclosure, a base station comprises: a transceiver; and at least one processor connected to the transceiver, and the at least one processor is:

[0045] Configuration information regarding at least one AI part model, which is a part of the entire AI model for CSI reporting, is transmitted to the terminal, and CSI obtained using the entire AI model including the AI ​​part model updated based on the configuration information regarding at least one AI part model is received from the terminal, and the AI ​​part model can be updated at the terminal based on the instruction information of the AI ​​part model and the weight information of the AI ​​part model included in the configuration information regarding at least one AI part model.

[0046] 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.

[0047] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0048] In describing the embodiments, technical details that are well known in the technical field 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.

[0049] 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.

[0050] 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 related functions or configurations 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 entire specification.

[0051] 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), wireless 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.

[0052] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0053] 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.

[0054] 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 may be configured to run one or more processors. Accordingly, 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 embodiment, the '~part' may include one or more processors.

[0055] 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.

[0056] As a representative example of the above-mentioned broadband wireless communication system, the LTE system employs the Orthogonal Frequency Division Multiplexing (OFDM) method for the downlink (DL) and the Single Carrier Frequency Division Multiple Access (SC-FDMA) method for the uplink (UL). The uplink refers to a wireless link through which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B, or base station (BS)), and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above-mentioned multiple access method can distinguish the data or control information of each user by allocating and operating time-frequency resources to be sent for each user so that they do not overlap, that is, so that orthogonality is established.

[0057] 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 (URLLC).

[0058] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, it necessitates improvements in various transmission and reception technologies, including enhanced Multi-Input Multi-Output (MIMO) transmission technology. Additionally, while LTE transmits signals using a maximum bandwidth of 20 MHz in the 2 GHz band, the 5G communication system can meet the data transmission speeds required by using a frequency bandwidth wider than 20 MHz in frequency bands of 3–6 GHz or above 6 GHz.

[0059] Simultaneously, 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 a large number of terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT devices are attached to various sensors and equipment to provide communication functions, the system must be able to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones not covered by cells, such as building basements; therefore, they may require wider coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must consist of low-cost devices, and since it is difficult to frequently replace terminal batteries, a very long battery life of 10 to 15 years may be required.

[0060] 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 7 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.

[0061] 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.

[0062] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0063] 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.

[0064] Referring to FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. A subframe (110) can be defined as a unit of resources in the time domain, and the subframe (110) It may include OFDM symbols. In the time and frequency domains, the basic unit of the resource is a resource element (RE, 101), which can be defined as one OFDM (Orthogonal Frequency Division Multiplexing) symbol (102) in the time axis and one subcarrier (103) in the frequency axis. In the frequency domain (For example, 12) consecutive REs can form a single resource block (Resource Block, RB, 104).

[0065] Figure 2 is a diagram illustrating an example of a slot structure used in a 5G wireless communication system.

[0066] 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 one example of FIG. 2, cases where μ=0 (204) and μ=1 (205) are set as the subcarrier spacing value are illustrated. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (203). That is, the number of slots per one subframe ( ) may vary, and accordingly, the number of slots per frame ( ) may vary. Depending on each subcarrier spacing setting μ and It can be defined by [Table 1] below.

[0067] [Table 1]

[0068]

[0069] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0070] Figure 3 is a diagram illustrating an example of a configuration for a bandwidth part (BWP) in a 5G wireless communication system.

[0071] 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.

[0072] [Table 2]

[0073]

[0074] 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).

[0075] According to one embodiment, prior to the Radio Resource Control (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 via the MIB, through which a PDCCH for receiving system information required for initial connection (Remaining System Information; which may correspond to RMSI or System Information Block 1; SIB1) can be transmitted. The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0. The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and numerology, for Control Resource Set #0. In addition, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and 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. In this case, the identifier (ID) of the initial bandwidth part may be considered as 0.

[0076] The settings for the bandwidth part supported by the 5G wireless communication system can be used for various purposes.

[0077] According to one embodiment, a setting for a bandwidth part may be used when the bandwidth supported by the terminal is smaller than the system bandwidth. For example, by setting a frequency location (setting information 2) of the bandwidth part to the terminal, the terminal can transmit and receive data at a specific frequency location within the system bandwidth.

[0078] In addition, according to one embodiment, a base station may set multiple bandwidth parts for a terminal for the purpose of supporting different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier interval and a 30 kHz subcarrier interval for a terminal, the base station may set two bandwidth parts to subcarrier intervals of 15 kHz and 30 kHz, respectively. Different bandwidth parts may be frequency division multiplexed, and when the base station intends to transmit and receive data with a specific subcarrier interval, the bandwidth part set to that subcarrier interval may be activated.

[0079] In addition, according to one embodiment, a base station may set a bandwidth part with different bandwidth sizes for the purpose of reducing the power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, monitoring an unnecessary downlink control channel using a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. To reduce the power consumption of the terminal, the base station may set a bandwidth part with a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth part, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth part according to the instructions of the base station.

[0080] Regarding the method of configuring the bandwidth part, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part through the Master Information Block (MIB) during the initial connection phase. More specifically, the terminal can receive a Control Resource Set (CORESET) configured from the MIB of the Physical Broadcast Channel (PBCH) for a downlink control channel through which Downlink Control Information (DCI) scheduling System Information Blocks (SIB) can be transmitted. The bandwidth of the Control Resource Set configured by the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which SIBs are transmitted. In addition to receiving SIBs, the Initial Bandwidth Part may also be utilized for Other System Information (OSI), paging, and Random Access.

[0081] When one or more bandwidth parts are set for a terminal, the base station may instruct the terminal to change the bandwidth part using the Bandwidth Part Indicator field within the DCI. For example, in FIG. 3, if the currently active bandwidth part of the terminal is Bandwidth Part #1 (301), the base station may instruct the terminal to Bandwidth Part #2 (302) using the Bandwidth Part Indicator within the DCI, and the terminal may perform a bandwidth part change to Bandwidth Part #2 (302) indicated by the received Bandwidth Part Indicator within the DCI.

[0082] As mentioned above, since DCI-based bandwidth part changes can be directed by the DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI in the changed bandwidth part without difficulty. To this end, the standard specifies the delay time (T) required when changing a bandwidth part. BWP The requirements for ) have been defined, and can be defined as, for example, as follows.

[0083] [Table 3]

[0084]

[0085] The requirements for bandwidth part change delay time may support Type 1 or Type 2 depending on the terminal's capability. The terminal may report the supported bandwidth part delay time type to the base station.

[0086] In accordance with the aforementioned requirements for the bandwidth part change delay time, if the terminal receives a DCI containing a bandwidth part change indicator in slot n, the terminal performs a change to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T BWP Completion can be achieved at a time no later than that, and transmission and reception for the data channel scheduled by the corresponding DCI can be performed in the changed new bandwidth part. If the base station intends to schedule a data channel in the new bandwidth part, the terminal's bandwidth part change delay time (T BWP Considering ), time-domain resource allocation for a data channel can be determined. That is, when a base station schedules a data channel with a new bandwidth part, in the method for determining time-domain resource allocation for a data channel, the data channel can be scheduled after the bandwidth part change delay time. Accordingly, the terminal [is notified] that the DCI instructing the bandwidth part change is the bandwidth part change delay time (TBWP You may not expect to indicate a slot offset (K0 or K2) value smaller than )

[0087] If a terminal receives a DCI (e.g., DCI format 1_1 or 0_1) indicating a change in bandwidth part, the terminal may not perform any transmission or reception during a time interval corresponding to the time interval from the third symbol of the slot in which the PDCCH containing the said DCI was received to the beginning of the slot indicated by the slot offset value (K0 or K2) indicated by the time domain resource allocation indicator field within the said DCI. For example, if a terminal receives a DCI indicating a change in bandwidth part in slot n, and the slot offset value indicated by the said DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0088] Next, we will explain the SS (Synchronization Signal) / PBCH block in the 5G wireless communication system.

[0089] 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.

[0090] - PSS: A signal that serves as the reference for downlink time / frequency synchronization and provides some information about the cell ID.

[0091] - 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.

[0092] - PBCH: Provides essential system information required for transmitting and receiving data channels and control channels of the terminal. 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 that transmits system information, etc.

[0093] - 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.

[0094] The terminal can detect PSS and SSS during the initial connection phase and can decode PBCH. It can obtain MIB from PBCH and receive Control Resource Set (CORESET) #0 (which may correspond to a Control Resource Set with a Control Resource Set index of 0) 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-Locations (QCL). The terminal can receive system information using 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.

[0095] Next, Downlink Control Information (DCI) in 5G wireless communication systems will be explained in detail.

[0096] 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 the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields selected between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0097] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after undergoing channel coding and modulation processes. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled into a Radio Network Temporary Identifier (RNTI) corresponding to the terminal's identity. Different RNTIs may be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, or random access responses. In other words, the RNTI is not explicitly transmitted but is included in the CRC calculation process. Upon receiving a DCI message transmitted over the PDCCH, the terminal checks the CRC using the assigned RNTI, and if the CRC check result is correct, the terminal knows that the message was sent to it.

[0098] For example, a DCI scheduling a PDSCH for System Information (SI) can be scrambled into an SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message can be scrambled into an RA-RNTI. A DCI scheduling a PDSCH for a Paging message can be scrambled into a P-RNTI. A DCI notifying a Slot Format Indicator (SFI) can be scrambled into an SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) can be scrambled into a TPC-RNTI. A DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled into a C-RNTI (Cell RNTI), MCS-C-RNTI (Modulation Coding Scheme C-RNTI), or CS-RNTI (Configured Scheduling RNTI).

[0099] 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 following information.

[0100] [Table 4]

[0101]

[0102]

[0103] 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 following information.

[0104] [Table 5]

[0105]

[0106]

[0107]

[0108]

[0109]

[0110]

[0111] DCI format 1_0 can be used as a countermeasure DCI for scheduling PDSCH, whereby the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI may include, for example, the following information.

[0112] [Table 6]

[0113]

[0114]

[0115] 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 following information.

[0116] [Table 7]

[0117]

[0118]

[0119]

[0120]

[0121] The following describes the time domain resource allocation method for data channels in a 5G wireless communication system.

[0122] The base station may set a table for time domain resource allocation information for the Physical Downlink Shared Channel (PDSCH) and the Physical Uplink Shared 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 [Table 8] and [Table 9] below may be notified from the base station to the terminal.

[0123] [Table 8]

[0124]

[0125] [Table 9]

[0126]

[0127] 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.

[0128] The following describes the frequency domain resource allocation method for data channels in a 5G wireless communication system.

[0129] 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 a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

[0130] Resource allocation type 0

[0131] RB allocation information may be notified from the base station to the terminal in the form of a bitmap for the RBG (Resource Block Group). In this case, the RBG may be composed of a set of consecutive VRBs (Virtual RBs), and the size P of the RBG may be determined based on a value set as an upper layer parameter (rbg-Size) and the size value of the bandwidth part defined in the table below.

[0132] [Table 10] Nominal RGB size P

[0133]

[0134] - Size Total number of RGBs in bandwidth part i ( ) can be defined as follows.

[0135] , where

[0136] * the size of the first RBG is

[0137] The size of the last RGB is if andPotherwise,

[0138] * the size of all other RBGs isP.

[0139] - Each bit of a bitmap of bit size can correspond to a respective RGB. The RGBs can be indexed in increasing order of frequency, starting from the lowest frequency position in the bandwidth part. Within the bandwidth part For the RBGs, from RBG#0 to RBG#( -1) This RGB bitmap can be mapped from MSB to LSB. The terminal can determine that the RGB corresponding to the bit value is assigned when a specific bit value in the bitmap is 1, and can determine that the RGB corresponding to the bit value is not assigned when a specific bit value in the bitmap is 0.

[0140] Resource Allocation Type 1

[0141] - RB allocation information can be notified from the base station to the terminal as information regarding the starting position and length of consecutively allocated VRBs. At this time, interleaving or non-interleaving may be additionally applied to the consecutively allocated VRBs. The resource allocation field of Resource Allocation Type 1 may be composed of a Resource Indication Value (RIV), and the RIV is the starting point of the VRB ( ) and the length of consecutively allocated RB ( It can be composed of. More specifically, The RIV within the bandwidth part of the size can be defined as follows.

[0142] if then

[0143] *

[0144] else

[0145] *

[0146] where and shall not exceed .

[0147] 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 field indicating resource allocation within the DCI format indicating scheduling is set, and the terminal may interpret the resource allocation field information of the DCI field based on this.

[0148] In the following, we intend to specifically explain the Modulation and Coding Scheme (MCS) used in 5G wireless communication systems.

[0149] In 5G, multiple MCS index tables are defined for PDSCH and PUSCH scheduling. Among the multiple MCS tables, which MCS table the terminal assumes can be set or indicated through upper layer signaling or L1 signaling from the base station to the terminal, or through the RNTI value assumed by the terminal during PDCCH decoding.

[0150] MCS index table 1 for PDSCH and CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in Table 11 below.

[0151] [Table 11]: MCS index table 1 for PDSCH

[0152]

[0153] MCS index table 2 for PDSCH and CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in Table 12 below.

[0154] [Table 12]: MCS index table 2 for PDSCH

[0155]

[0156] MCS index table 3 for PDSCH and CP-OFDM-based PUSCH (or PUSCH without transform precoding) may be as shown in Table 13 below.

[0157] [Table 13]: MCS index table 3 for PDSCH

[0158]

[0159] MCS index table 1 for DFT-s-OFDM-based PUSCH (or PUSCH with transform precoding) may be as shown in Table 14 below.

[0160] [Table 14]: MCS index table for PUSCH with transform precoding and 64QAM

[0161]

[0162] MCS index table 2 for DFT-s-OFDM-based PUSCH (or PUSCH with transform precoding) may be as shown in Table 15 below.

[0163] [Table 15]: MCS index table 2 for PUSCH with transform precoding and 64QAM

[0164]

[0165] The MCS index table for PUSCH with transformation precoding (Transform Precoding or DFT (Discrete Fourier Transform) precoding) and 64 QAM applied may be as shown in [Table 16] below.

[0166] [Table 16]

[0167]

[0168] The MCS index table for PUSCH with transformation precoding (Transform Precoding or DFT (Discrete Fourier Transform) precoding) and 64 QAM applied may be as shown in [Table 17] below.

[0169] [Table 17]

[0170]

[0171] In the following, the downlink control channel in a 5G wireless communication system will be explained in more detail with reference to the drawings.

[0172] 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.

[0173] 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.

[0174] 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, Master Information Block (MIB), Radio Resource Control (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, information for configuring a control resource set may include the following information.

[0175] [Table 18]

[0176]

[0177] In [Table 18], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with DMRS transmitted from the corresponding control resource set.

[0178] Figure 5 is a diagram illustrating the structure of a downlink control channel of a 5G wireless communication system.

[0179] That is, Figure 5 is a diagram showing an example of a basic unit of time and frequency resources that constitute a downlink control channel that can be used in a 5G wireless communication system.

[0180] Referring to FIG. 5, the basic unit of time and frequency resources constituting the control channel can be called a REG (Resource Element Group, 503), and the REG (503) can be defined as 1 OFDM symbol (501) on the time axis and 1 PRB (Physical Resource Block, 502) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (503) to form a downlink control channel allocation unit.

[0181] 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.

[0182] 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 (AL), 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 at 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 at all configured aggregation levels.

[0183] 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 an SIB 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.

[0184] 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 following information.

[0185] [Table 19]

[0186]

[0187]

[0188] According to the configuration information, the base station may set one or multiple search space sets for the terminal. According to one embodiment, the base station may set search space set 1 and search space set 2 for the terminal, and may set DCI format A scrambled with X-RNTI in search space set 1 to be monitored in a common search space, and may set DCI format B scrambled with Y-RNTI in search space set 2 to be monitored in a terminal-specific search space.

[0189] According to the configuration information, one or more sets of search spaces may exist in a common search space or a terminal-specific search space. For example, Search Space Set #1 and Search Space Set #2 may be configured as a common search space, and Search Space Set #3 and Search Space Set #4 may be configured as a terminal-specific search space.

[0190] 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.

[0191] - 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

[0192] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0193] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0194] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0195] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0196] 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.

[0197] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0198] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0199] The specified RNTIs may follow the definitions and uses below.

[0200] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH scheduling

[0201] MCS-C-RNTI (Modulation Coding Scheme C-RNTI): Used for terminal-specific PDSCH scheduling

[0202] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0203] CS-RNTI (Configured Scheduling RNTI): Used for semi-statically configured terminal-specific PDSCH scheduling.

[0204] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase

[0205] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0206] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0207] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH is pucturing.

[0208] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0209] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0210] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0211] The aforementioned specified DCI formats may follow the definitions below.

[0212] [Table 20]

[0213]

[0214] In a 5G wireless communication system, the search space of aggregation level L in a control resource set p and a search space set s can be expressed as Equation 1 below.

[0215] [Mathematical Formula 1]

[0216]

[0217] - L: Lamination Level

[0218] - n CI : Carrier Index

[0219] - N CCE,p : Total number of CCEs existing in control resource set p

[0220] - n μ s,f : Slot Index

[0221] - M (L) p,s,max : Number of PDCCH candidates at assembly level L

[0222] - m snCI = 0, ..., M (L) p,s,max -1: PDCCH candidate index of aggregation level L

[0223] - i = 0, ..., L-1

[0224] - , , , , ,

[0225] - n RNTI : Terminal identifier

[0226] The value may be 0 for the common search space.

[0227] 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.

[0228] [CSI framework]

[0229] 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.

[0230] 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 the terminal. For example, the base station and the terminal may exchange signaling information such as [Table 21] to transmit information regarding the resource setting.

[0231] [Table 21]

[0232]

[0233] In [Table 21], 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 aperiodidic transmission, semi-persistent transmission, or periodic transmission. The resource set list may be a set containing resource sets for channel measurement or a set containing resource sets for interference measurement. If the resource set list is a set containing resource sets for channel measurement, each resource set may include at least one resource, which may be a CSI reference signal (CSI-RS) resource or an index of a synchronous / broadcast channel block (SS / PBCH block, SSB). If the resource set list is a set containing resource sets for interference measurement, each resource set may include at least one interference measurement resource (CSI interference measurement, CSI-IM).

[0234] For example, if the resource set includes CSI-RS, the base station and the terminal can exchange signaling information such as [Table 22] to transmit information about the resource set.

[0235] [Table 22]

[0236]

[0237] [Table 22] The signaling information NZP-CSI-RS-ResourceSet contains information for each resource set. According to the signaling information, each resource set contains at least information regarding the resource set index (nzp-CSI-ResourceSetId) or the set of indices of the included CSI-RS (nzp-CSI-RS-Resources), and may include some information regarding the spatial domain transmission filter of the included CSI-RS resource (repetition) or whether the included CSI-RS resource is used for tracking (trs-Info).

[0238] CSI-RS can be the most representative reference signal included in the resource set. The base station and the terminal can exchange signaling information such as [Table 23] to convey information about the CSI-RS resource.

[0239] [Table 23]

[0240]

[0241] In [Table 23], the signaling information NZP-CSI-RS-Resource contains information for each CSI-RS. The information included in the signaling information NZP-CSI-RS-Resource may have the following meanings.

[0242] - nzp-CSI-RS-ResourceId: CSI-RS resource index

[0243] - resourceMapping: Resource mapping information of CSI-RS resources

[0244] - powerControlOffset: Ratio between PDSCH EPRE (Energy Per RE) and CSI-RS EPRE

[0245] - powerControlOffsetSS: Ratio between SS / PBCH block EPRE and CSI-RS EPRE

[0246] - scramblingID: Scrambling index of the CSI-RS sequence

[0247] - periodicityAndOffset: Transmission period and slot offset of the CSI-RS resource

[0248] - qcl-InfoPeriodicCSI-RS: TCI-state information if the corresponding CSI-RS is a periodic CSI-RS

[0249] 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 24] below.

[0250] [Table 24]

[0251]

[0252]

[0253] [Table 24] shows the frequency resource density, CDM type, frequency axis, and time axis start position 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, it is possible for the length of the bitmap to change according to the Z value in [Table 18], as with frequency position assignment, but since the principle is similar to the explanation above, redundant explanations will be omitted below.

[0254] 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.

[0255] 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 [Table 25] to transmit information regarding the report setting.

[0256] [Table 25]

[0257]

[0258]

[0259]

[0260] In [Table 25], the signaling information CSI-ReportConfig contains information for each report setting. The information included in the above signaling information CSI-ReportConfig may have the following meanings.

[0261] - reportConfigId: report setting index

[0262] - carrier: Serving cell index

[0263] - resourcesForChannelMeasurement: Resource setting index for channel measurement linked to report setting

[0264] - csi-IM-ResourcesForInterference: Resource setting index containing CSI-IM resources for interference measurement that have a connection with the report setting

[0265] - nzp-CSI-RS-ResourcesForInterference: Resource setting index containing CSI-RS resources for interference measurement that have a relationship with the report setting

[0266] - 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.

[0267] - 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).

[0268] - 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.

[0269] - timeRestrictionForChannelMeasurements: Whether there are time axis constraints on the reference signal for channel measurement among the reference signals referenced by the reported channel information.

[0270] - timeRestrictionForInterferenceMeasurements: Whether there are time axis constraints on the reference signal for interference measurement among the reference signals referenced by the reporting channel information.

[0271] - codebookConfig: Codebook information referenced by the reporting channel information

[0272] - groupBasedBeamReporting: Whether to group beams in channel reporting

[0273] - cqi-Table: CQI table index referenced by the reporting channel information

[0274] - subbandSize: An index indicating the subband size of the channel information

[0275] - non-PMI-PortIndication: Port mapping information referenced when reporting non-PMI channel information

[0276] 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.

[0277] The base station may instruct the terminal to report channel state information (CSI) through upper layer signaling, including RRC (Radio Resource Control) signaling or MAC (Medium Access Control) CE (Control Element) signaling, or L1 signaling (e.g., common DCI, group-common DCI, terminal-specific DCI).

[0278] 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 by the slot interval with the PDCCH indicated via the DCI, and the starting symbol and symbol length within the slot can be indicated through the time domain resource assignment field of the aforementioned DCI.

[0279] For example, a base station may instruct a terminal to send a semi-persistent CSI report via PUSCH using a DCI with DCI format 0_1. The base station may activate or deactivate the semi-persistent CSI report sent via PUSCH using a DCI scrambled with SP-CSI-RNTI. When the semi-persistent CSI report is activated, the terminal may periodically report channel information according to a set slot interval. When the semi-persistent CSI report is deactivated, the terminal may stop the periodic channel information reporting that was activated. The base station establishes a number of CSI report trigger states containing parameters for the terminal's semi-persistent CSI report or parameters for the semi-persistent CSI report through upper layer signaling. Parameters for a CSI report, or CSI report trigger states, may include a set of possible slot intervals or slot intervals between a PDCCH containing a DCI directing a CSI report and a PUSCH containing a CSI report, a slot interval between a slot where an upper-layer signaling directing a CSI report is activated and a PUSCH containing a CSI report, a slot interval period of the CSI report, and the type of channel information included. When a base station activates some of a plurality of CSI report trigger states or some of a plurality of report settings to a terminal via upper-layer signaling or DCI, the terminal may report channel information according to the report setting included in the directed CSI report trigger state or the CSI report setting configured in the activated report setting.The above channel information reporting can be performed through a PUSCH that is semi-continuously scheduled in DCI format 0_1 ​​scrambled with SP-CSI-RNTI. Time-axis resource allocation of the PUSCH containing the 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.

[0280] 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 may be transmitted via 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, the slot interval between the slot where the upper-layer signaling is activated and the PUCCH containing the CSI report, and the starting symbol and symbol length within the slot may be indicated by the starting symbol and symbol length assigned to the PUCCH resource set through upper-layer signaling.

[0281] For example, a base station may instruct a terminal to issue a periodic CSI report through upper-layer signaling. The base station may enable or disable the periodic CSI report through upper-layer signaling, including RRC signaling. When the periodic CSI report is enabled, the terminal may periodically report channel information according to the configured 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 through 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 status, 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.

[0282] When a base station instructs a terminal to provide an aperiodic CSI report or a semi-persistent CSI report via DCI, the terminal can determine whether it can perform a valid channel report through the instructed CSI report by considering the channel computation time required for the CSI report. For the aperiodic CSI report or semi-persistent CSI report instructed via DCI, the terminal can perform a valid CSI report starting from the uplink symbol after the Z symbol, after the last symbol included in the PDCCH containing the DCI instructing the CSI report 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 report, the numerology of the uplink bandwidth part corresponding to the PUSCH transmitting the CSI report, and the type or characteristics of the channel information 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 CSI report to be determined as a valid CSI report (for the CSI report to be valid), the uplink transmission of the CSI report, including the timing advance, must not be performed before the Zref symbol. In this case, the Zref symbol is time from the moment the last symbol of the aforementioned triggering PDCCH ends. It is an uplink symbol that initiates the CP (cyclic prefix). Here, the detailed value of Z follows the explanation below, , , , , and is numerology. At this time Is The largest of them It can be promised to use something that causes a value, is the subcarrier interval used for PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, can refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example Is The largest of them It is also possible to promise to use something that causes a value. and Refer to the explanation above for the definition. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI reporting validity condition 1.

[0283] Furthermore, 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 may be executed 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 channel information 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 CSI report to be determined as a valid CSI report (for the CSI report to be a valid CSI report), the uplink transmission of the CSI report, including the timing advance, must not be executed before the Zref' symbol. At this time, the Zref' 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. It is an uplink symbol that initiates the CP (cyclic prefix). Here, the detailed value of Z' follows the explanation below, , , , , and is numerology. At this time Is The largest of them It can be promised to use something that causes a value, is the subcarrier interval used for triggering PDCCH transmission, is the subcarrier spacing used for CSI-RS transmission, can refer to the subcarrier spacing of the uplink channel used for transmitting UCI (Uplink control information) for CSI reporting. As another example, Is The largest of them It can be promised to use what causes a value. In this case, and Refer to the explanation above for the definition. For convenience of future explanation, satisfying the above conditions will be referred to as satisfying CSI reporting validity condition 2.

[0284] If a base station instructs a terminal to perform an aperiodic CSI report on an aperiodic 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 aperiodic CSI reporting based on an aperiodic reference signal, it must satisfy both CSI reporting validity conditions 1 and 2 to be determined as a valid CSI report.

[0285] If the timing of the CSI report instructed by the base station does not satisfy the CSI computation time requirements, the terminal may determine that the CSI report is invalid and not consider updating the channel information status for the CSI report.

[0286] The Z and Z' symbols for the aforementioned CSI computation time calculation follow [Table 26] and [Table 27] below. For example, if the channel information reported in the CSI report includes only wideband information, the number of reference signal ports is 4 or less, there is one reference signal resource, the codebook type is 'type I-SinglePanel', or the type of reported channel information (report quantity) is 'cri-RI-CQI', the Z and Z' symbols are those in [Table 27]. , It follows the value. This will be named Delay Requirement 2 in the future. In addition, if the PUSCH containing the CSI report does not contain a TB or HARQ-ACK and the terminal's CPU occupation is 0, the Z and Z' symbols are from [Table 26]. , It follows the value and is named Delay Requirement 1. The explanation regarding the aforementioned CPU occupation is described in detail below. Additionally, if the report quantity is 'cri-RSRP' or 'ssb-Index-RSRP', the Z and Z' symbols are from [Table 27]. , Follows the values. X1, X2, X3, and X4 in [Table 27] represent the terminal's capability (UE capability) regarding beam reporting time, and KB1 and KB2 in [Table 27] represent the terminal's capability regarding beam switching time. In cases where the type or characteristic of channel information reported in the aforementioned CSI report does not apply, the Z and Z' symbols are [Table 27] , Follows the value.

[0287] [Table 26]

[0288]

[0289] [Table 27]

[0290]

[0291] When a base station instructs a terminal to issue an aperiodic / semi-persistent / periodic CSI report, it may set a CSI reference resource to determine the reference time and frequency for the channel to be reported in the CSI report. The frequency of the CSI reference resource may be the carrier and subband information to be measured for the CSI, as specified in the CSI report configuration, which may correspond to the carrier and reportFreqConfiguration in [Table 25], respectively. The time of the CSI reference resource may be defined based on the time at which the CSI report is transmitted. For example, if CSI report #X is instructed to be transmitted in the uplink slot n' of the carrier and BWP to which the CSI report is to be transmitted, the time of the CSI reference resource for CSI report #X may be defined as the downlink slot n-nCSI-ref of the carrier and BWP measuring the CSI. When downlink slot n is named μDL for the numerology of the carrier and BWP measuring CSI, and μUL for the numerology of the carrier and BWP transmitting CSI report #X It is calculated as follows. nCSI-ref, the slot interval between downlink slot n and the CSI reference signal, depends on the number of CSI-RS / SSB resources for channel measurement when CSI report #X transmitted in uplink slot n' is a semi-persistent or periodic CSI report, if a single CSI-RS / SSB resource is connected to the said CSI report If it follows and multiple CSI-RS / SSB resources are connected to the relevant CSI report Follows. If the CSI report #X transmitted in uplink slot n' is an aperiodic CSI report, considering the CSI computation time Z' for channel measurement It is calculated as. The aforementioned is the number of symbols included in a slot, and in NR It assumes.

[0292] 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 connected to the above 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.

[0293] In the embodiments of the present disclosure, the CSI-RS / CSI-IM / SSB occasion refers to the transmission time of the CSI-RS / CSI-IM / SSB resource(s) determined by the upper layer setting or a combination of the upper layer setting and DCI triggering. For example, for a semi-persistent or periodic CSI-RS resource, 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 25] according to the resource mapping information. For another example, for an aperiodic CSI-RS resource, 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 25] according to the resource mapping information.

[0294] 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.

[0295] - 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.

[0296] - 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

[0297] 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.

[0298] 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'.

[0299] 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.

[0300] - 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'.

[0301] - 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'.

[0302] 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).

[0303] The base station may instruct a CSI report by considering the amount of channel information that the terminal can simultaneously calculate for the CSI report, that is, the number of the terminal's channel information processing units (CSI processing units, CPUs). The number of channel information processing units that the terminal can simultaneously calculate If so, the terminal If you do not expect CSI report instructions from base stations that require more channel information calculations, or Updates to channel information that require more channel information calculations may not be considered. The terminal can report to the base station via upper layer signaling, or the base station can configure it via upper layer signaling.

[0304] The CSI report instructed by the base station to the terminal is the total number of channel information that the terminal can calculate simultaneously. It is assumed that some or all of the CPU is occupied for channel information calculation. For each CSI report, for example, CSI report The number of channel information calculation units required for If so, the number of channel information calculation units required for a total of N CSI reports is It can be said that the calculation unit of channel information required per reportQuantity set in the CSI report can be set as shown in the following [Table 28].

[0305] [Table 28]

[0306]

[0307] The number of channel information calculations required by the terminal for multiple CSI reports at a specific point in time is the number of channel information calculation units that the terminal can calculate simultaneously. In more cases, the terminal may not consider updating channel information for some CSI reports. Among multiple directed CSI reports, the CSI reports for which channel information updates are not considered are determined by taking into account at least the time the calculation of channel information required for the CSI report occupies the CPU and the priority of the reported channel information. For example, it may not consider updating channel information for a CSI report where the calculation of channel information required for the CSI report starts at the latest time, and it is possible to prioritize not considering channel information updates for CSI reports with lower channel information priority.

[0308] The priority of the above channel information can be determined by referring to [Table 29] below.

[0309] [Table 29]

[0310]

[0311] The CSI priority for a CSI report is determined by the priority value PriiCSI(y,k,c,s) in [Table 29]. Referring to [Table 29], the CSI priority value is determined by the type of channel information included in the CSI report, the time-axis 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 determined by comparing the priority value PriiCSI(y,k,c,s) and judging that the CSI report with the smaller priority value has a higher CSI priority.

[0312] 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.

[0313] 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).

[0314] For the aforementioned CSI resource setting (CSI-ResourceConfig), each CSI resource setting CSI-ReportConfig is S( 1) It may include 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 associated with a CSI reporting 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.

[0315] - CSI-IM resources for interference measurement

[0316] - NZP CSI-RS resources for interference measurement

[0317] - NZP CSI-RS resources for channel measurement

[0318] 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.

[0319] 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 30] below.

[0320] [Table 30]

[0321]

[0322] Aperiodic CSI reporting can be triggered by the "CSI request" field of the aforementioned DCI format 0_1 ​​corresponding 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.

[0323] - If all bits of the CSI request field are 0, this may mean that a CSI report is not requested.

[0324] - 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.

[0325] - 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.

[0326] The following [Table 31] shows an example of the relationship between CSI request indicators and CSI trigger states that can be indicated by those indicators.

[0327] [Table 31]

[0328]

[0329] 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.

[0330] Figure 6 is a diagram illustrating an example of a non-periodic CSI reporting method.

[0331] In one example (600) of FIG. 6, the terminal can monitor PDCCH (601) to obtain DCI format 0_1, from which it can obtain scheduling information and CSI request information for PUSCH (605). The terminal can obtain resource information for 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 it receives DCI format 0_1 ​​and the parameter for the offset within the CSI resource set setting (e.g., NZP CSI-RS resource set setting (NZP-CSI-RS-ResourceSet) (the aperiodicTriggeringOffset described above). 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 32] below.

[0332] [Table 32]

[0333]

[0334] In one example (600) of FIG. 6, an example is shown in which the value of the aforementioned offset (603) 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 one example (600) of FIG. 6, the terminal obtains a K2 value of 3 corresponding to the value of the slot offset (604) for PDCCH-to-PUSCH, and accordingly, at the time when PUSCH (605) among the slots (606, 607, 608, 609) receives PDCCH (601), it can be transmitted from slot 3 (609), which is 3 slots away from slot 0 (606).

[0335] In one example (610) of FIG. 6, the terminal can monitor the PDCCH (611) to obtain DCI format 0_1, from which it can obtain scheduling information and CSI request information for PUSCH (615). The terminal can obtain resource information for the CSI-RS (612) to be measured from the received CSI request indicator. One example (610) of FIG. 6 shows an example in which the value of the offset (613) for the aforementioned CSI-RS is set to X=1. In this case, the terminal can receive the CSI-RS (612) in slot 1 (617), which is one slot away from the slot (corresponding to slot 0 (616) in FIG. 6) where the DCI format 0_1 ​​triggering the non-periodic CSI report was received, and can report the CSI information measured by the received CSI-RS to the base station via PUSCH (615). In one example (610) of FIG. 6, the terminal obtains a K2 value of 3 corresponding to the value of the slot offset (614) for PDCCH-to-PUSCH, and accordingly, PUSCH (615) can be transmitted from slot 3 (619), which is 3 slots away from slot 0 (616) that received DCI format 0_1 ​​among the slots (616, 617, 618, 619).

[0336] Aperiodic CSI reports may include at least one or both of CSI part 1 or CSI part 2, and when the aperiodic CSI reports are transmitted via PUSCH, they may be multiplexed with the transport block. For multiplexing, a CRC is inserted into the input bits of the aperiodic CSI, and after undergoing encoding and rate matching, it may be mapped to a specific pattern in a resource element within PUSCH and transmitted. The insertion of the CRC may be omitted depending on the coding method or the length of the input bits. The number of modulation symbols calculated for rate matching during the multiplexing of CSI Part 1 or CSI part 2 included in the aperiodic CSI reports can be calculated as shown in [Table 33] below.

[0337] [Table 33]

[0338]

[0339]

[0340] 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.

[0341] Additionally, regarding PUSCH repetitive transmission method B, if the terminal receives a DCI that schedules a non-periodic CSI report or enables semi-permanent CSI report without scheduling for the transport block, the value of the nominal repetition may be assumed to be 1 even if the number of PUSCH repetitive transmissions set by the upper layer signaling is greater than 1. Additionally, if the terminal schedules or enables a non-periodic or semi-permanent CSI report without scheduling for the transport block based on PUSCH repetitive transmission method B, the terminal may expect the first nominal repetition to be the same as the first actual repetition. For a PUSCH transmitted including the semi-permanent CSI based on PUSCH repetitive transmission method B without scheduling for the DCI after semi-permanent CSI report is enabled by the DCI, if the first nominal repetition is different from the first actual repetition, the transmission for the first nominal repetition may be ignored.

[0342] If the frequency band is extended to frequency range 3 (FR3) in the future to provide services, the number of CSI-RS ports for acquiring channel state information may be configured up to, for example, 256 ports. Supporting such a large number of CSI-RS ports inevitably increases the overhead for CSI-RS transmission; therefore, methods and devices are required to reduce the number of CSI-RS ports for transmission. To address this, a method can be used to estimate the channel state of all ports based on a small number of CSI-RS ports while reducing CSI-RS overhead by utilizing artificial intelligence to compress large amounts of CSI-RS data (for example, compressed to 128 CSI-RS ports) for transmission. However, since artificial intelligence models are trained based on data, the model may be trained differently depending on the characteristics of the data. In particular, for AI used for CSI-RS compression, since input and output data are closely related to the channel, the AI ​​model may vary depending on the channel environment and characteristics, as well as the antenna implementation methods of the base station and terminal. Therefore, an artificial intelligence model trained with data accumulated under specific scenarios and configurations may experience degraded inference performance on data observed under different scenarios and configurations. This can be viewed as performance degradation due to generalization.

[0343] To mitigate AI performance degradation during the generalization process, multiple AI models trained with data accumulated from each scenario and configuration may be used. An AI model trained for the intended scenario and configuration can deliver optimal performance. However, training all AI models based on various channel environments and characteristics, base station and terminal antenna implementation methods, and even different terminal / base station vendors, and then transmitting these trained models via RRC signaling or MAC-CE, results in significantly high resource overhead.

[0344] The present disclosure proposes a generalization technique for a method to compress and transmit / receive large volume CSI-RS based on artificial intelligence partial model transmission.

[0345] The method for reducing AI model transmission overhead proposed in this disclosure is explained 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.

[0346] <First Embodiment>: AI partial model transfer-based generalization

[0347] FIG. 7 is a diagram illustrating the concept of AI-based CSI-RS compression for reducing CSI-RS overhead applied to various embodiments of the present disclosure.

[0348] 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 (721) selects some M of the total N CSI-RS ports ( <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 기지국(721)은 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. 기지국(721)은 상기 CSI-RS 포트 압축 (701)에 기반하여 압축된 CSI-RS (712)를 채널 (713)을 통해 단말 (722)로 전송한다.

[0349] 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 (722) estimates the channel corresponding to the compressed CSI-RS port (702). Through the above estimation, the terminal (722) 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 (722) 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. The terminal (722) generates channel state information (CSI) for the entire restored CSI-RS port channel (716) (704). The channel state information may include at least one of a precoding matrix indicator (PMI), a channel quality indicator (CQI), and a rank indicator (RI) for the entire CSI-RS port channel. The terminal (722) may feed back the generated channel state information to the base station (717).

[0350] FIG. 8 is a diagram illustrating concepts of an AI full model and an AI partial model applicable to various embodiments of the present disclosure. Referring to FIG. 8, the input of the AI ​​full model for CSI-RS compression is a compressed CSI-RS observation (800), and the output is a restored channel (801). The AI ​​full model (802) may be composed of weight-common layers (810) and weight-variable layers (811). The weight-common layers (810) refer to a part of the model in the full AI model where weight updates are not performed, and the weight-variable layers (811) may be defined as a part of the model in the full AI model where weight updates are performed and as an AI partial model.

[0351] The base station can support generalization according to various channel scenarios and configurations through training of the weight common layer (810) and the weight variable layer (811). Referring to FIG. 8, the training process to support generalization can be composed of three steps. In this description, it is assumed that the training process is performed to apply the model trained in Scenario #A / Configuration #A to Scenario #B / Configuration #B. Step 1 (820) is the process of training the entire AI model (802), which includes both the weight common layer (810) and the weight variable layer (811), with the data of Scenario #A / Configuration #A. Through this, the trained entire AI model can support Scenario #A / Configuration #A. Step 2 (821) is the process of fixing the weights of the weight common layer (810) to support Scenario #B / Configuration #B by training only the weight variable layer (811). That is, even if AI model training is performed after Step 2, the weights of the weight common layer (810) are no longer updated. Step 3 (822) is a process of training only the variable weight layer (811) using the data of Scenario #B / Configuration #B. Through the aforementioned training process, the base station can obtain the weights of two types of variable weight layers that can support Scenario #A / Configuration #A and Scenario #B / Configuration #B based on the common weight layer (810).

[0352] FIGS. 9a, 9b, and 9c illustrate generalization support based on the transmission of an AI full model and an AI partial model applied to various embodiments of the present disclosure. Referring to FIG. 9a, a base station (900) may configure an AI full model #A (910) trained with Scenario #A / Configuration #A data and an AI full model #B (911) trained with Scenario #B / Configuration #B data. A terminal (901) must receive the AI ​​full model #A (910) from the base station (900) to perform inference under Scenario #A / Configuration #A. Subsequently, if the terminal (901) moves to a location corresponding to Scenario #B / Configuration #B or if channel characteristics change, it is necessary to transmit the AI ​​full model #B (911) from the base station (900) to the terminal (901) to support this. In this way, when the base station (900) transmits the entire AI model according to all scenarios and configurations that it intends to support to the terminal (901), the model transmission overhead increases in proportion to the combination of scenarios / configurations that must be supported.

[0353] Referring to FIG. 9b, the base station (920) can utilize the training process of FIG. 8 to configure an AI partial model #A (924) to support Scenario #A / Configuration #A and an AI partial model #B (925) to support Scenario #B / Configuration #B based on a weighted common layer (923). Upon initial connection, the terminal (921) receives information from the base station (920) regarding an AI full model #A (922) trained with Scenario #A / Configuration #A data. Using the received AI full model #A (922), AI model inference in Scenario #A / Configuration #A is possible.

[0354] When the terminal (921) determines that a model for scenario #B / configuration #B is needed, or when the base station (920) determines that a model for scenario #B / configuration #B is needed, the base station (920) may instruct the terminal (921) to update the AI ​​full model #A (922). The instruction to update the AI ​​full model #A (922) may include the method described below. The base station (920) instructs the terminal (921) to update the AI ​​partial model #B (925) in the AI ​​full model #A (922), and transmits weights for the instructed AI partial model #B (925). The transmitted weights may be site-specific weights that differ per cell. The transmission of the AI ​​partial model may be performed via RRC signaling or MAC CE.

[0355] As shown in FIG. 9c, information regarding the weighted common layer (932) of the entire AI model may be loaded into the terminal (931) in advance. The loaded information regarding the weighted common layer (932) may be site-common information. Alternatively, the base station (930) may transmit information regarding the weighted common layer (932) upon initial access to the terminal without being loaded in advance. Subsequently, the base station (930) may transmit only the AI ​​partial model #A (933) to the terminal (931) for inference of scenario #A / configuration #A, or transmit only the AI ​​partial model #B (934) to the terminal (931) for inference of scenario #B / configuration #B. The transmission of the AI ​​partial model may be performed via RRC signaling or MAC CE. In another method, the base station (930) can transmit information about AI part model #A (933) and AI part model #B (934) via RRC signaling or MAC CE, and then select at least one of AI part model #A (933) and AI part model #B (934) using DCI (Downlink Control Information). The number of bits required for the DCI transmission is proportional to the number of models. For example, if four models are used, 2 bits of DCI are required.

[0356] The AI ​​partial model transmission-based generalization described above can significantly reduce model transmission overhead because it transmits only a part of the AI ​​model compared to the AI ​​full model transmission-based generalization described in Fig. 9a.

[0357] <Second Embodiment>: AI Partial Model Indexing

[0358] FIGS. 10a and 10b illustrate the configuration and configuration example of an AI model according to one embodiment of the present disclosure. Referring to FIG. 10a, an AI overall model (1010) that outputs a restored channel (1001) using a compressed CSI-RS measurement (1000) as input may be composed of a plurality of AI functional blocks (1011). FIG. 10a illustrates an AI overall model (1010) composed of a total of B AI functional blocks, from the first AI functional block to the Bth AI functional block (1011). An AI functional block may be composed of a plurality of AI layers. For example, in FIG. 10a, an AI functional block composed of Layer #A (1021), Layer #B (1022), and Layer #C (1023) is used. Generally, the types and number of layers constituting an AI functional block may be the same or different for each block. FIG. 10b illustrates a Residual Network (ResNet, 1030) as an example of the AI ​​model structure described above. In FIG. 10b, the ResNet (1030) is composed of B ResNet blocks (1031), and each ResNet block (1031) is composed of a convolution layer (1041), a batch normalization layer (1042), and an activation layer (1043). Although FIG. 10b describes the same layer configuration for each ResNet block (1031), the layers may be configured differently depending on the method of constructing the AI ​​model.

[0359] FIGS. 11a and 11b illustrate an indexing method for an AI partial model according to one embodiment of the present disclosure. Referring to FIG. 11a, an AI full model (1100) for CSI-RS compression is composed of B AI functional blocks (1120), of which The blocks correspond to the AI ​​partial model (1110). In this disclosure, the last of the AI ​​full model Although the AI ​​partial model was constructed with blocks, depending on the AI ​​model's configuration method and use case, the initial Dog blocks or middle Dog blocks or irregularly selected An AI partial model can be composed of blocks. When a base station directs an AI partial model to a terminal, it may use block indexing (1130). Block indexing can represent the AI ​​partial model in units of AI functional blocks (1120). For example, when a base station uses block indexing (1130) to represent an AI partial model, it may refer to p AI functional blocks using indices from 1 to p.

[0360] The base station can perform model transmission for an AI part model based on block indexing (1130). Higher-layer signaling, such as RRC (Radio Resource Control) signaling or MAC-CE (Medium Access Control-Control Element) signaling, may be used for the block indexing-based AI part model transmission performed above. When performing block indexing-based AI part model transmission through RRC signaling, the RRC parameters may consist of instructions for the AI ​​part model to be updated, weights for the indicated AI part model, etc. For example, the RRC parameters for block indexing-based AI part model transmission may be set as follows.

[0361]

[0362] When transmitting a block indexing-based AI submodel via MAC-CE signaling, the control element can be configured as follows. For example, if a set of weights for the p-1th and pth blocks of the AI ​​submodel is determined (see 1140), the base station may indicate a block index and change the weights of the indicated block index.

[0363] FIG. 11b illustrates a layer indexing (1160)-based AI partial model (1150) instruction. As previously explained, since the AI ​​full model (1140) is composed of a set of multiple layers, the AI ​​partial model (1150) can also be represented by multiple layers. For example, if the AI ​​partial model (1150) is composed of L layers, indexing can be started from a specific layer and referred to using indices from 1 to L up to the last layer of the AI ​​partial model (1150). Weights and hyperparameters, etc., can be changed layer by layer according to the referred indices. The RRC parameters for the layer indexing-based AI partial model transmission can be set as follows.

[0364]

[0365] Layer indexing-based AI submodels have higher degrees of freedom compared to block indexing-based AI submodels in that they can be directed layer by layer. This allows for updating weights layer by layer or directing different hyperparameters, functions, etc. For example, when attempting to perform model updates for the L-5th layer and L-3rd layer of an AI submodel, the base station can specify L-5 and L-3 based on layer indexing. The weights for the L-5th layer can be changed (1170), and the activation function for the L-3rd layer can be changed (1180).

[0366] <Third Embodiment>: Definition of time gap

[0367] FIG. 12 illustrates the time elapsed for the transmission of an AI partial model, the updating of an AI partial model, and the activation of an updated AI full model in a CSI-RS compression method based on the transmission of an AI partial model according to an embodiment of the present disclosure. In the figure, the transmitted AI partial model may be indicated by block indexing or layer indexing. Additionally, the transmission of information regarding the indicated AI partial model may be performed via MAC CE (1210). Generally, the updating of an AI partial model may be performed when the training scenario / configuration data and the inference scenario / configuration data are different, or when the performance of the AI ​​model in use deteriorates. For example, if the performance of the AI ​​model in use drops significantly, an AI model update must be performed to prevent system performance degradation. When transmitting the AI ​​partial model for AI model updating, both RRC signaling and MAC CE signaling may be used. Updating the AI ​​partial model via MAC CE may have the advantage of being faster than RRC signaling in terms of latency. Therefore, for latency-critical use cases or to minimize system performance degradation, updating the AI ​​partial model based on MAC CE transmission can be efficient.

[0368] The base station transmits the AI ​​partial model to the terminal (1200), and the terminal transmits a HARQ ACK (1211) for the received AI partial model to the base station via MAC CE (1210), after which the transmission of the partial model may be terminated (1201). The base station and the terminal require the same timing alignment for inference of the AI ​​full model obtained through the update of the AI ​​partial model. That is, the base station and the terminal can determine the processing time by considering the time required for the transmission of the AI ​​partial model, the termination of the AI ​​partial model update (1203), the deactivation of the existing model, and the activation of the updated model (1204). The processing time can be defined as the time required from the time the HARQ ACK is received until the updated model is activated (1204) and becomes capable of inference, and in this drawing It was labeled as (1202). The base station and the terminal are AI model inference for CSI-RS compressed transmission and reception can be performed after time (1205).

[0369] In FIGS. 13a and 13b, according to the structure of the AI ​​model An example defining is illustrated. As explained above. Because it performs model deactivation for the entire existing AI model, updates for partial AI models, and model activation for the updated models within It may vary depending on the structure of the AI ​​part model being transmitted, (in the case of block indexing) the number of blocks and block structure, (in the case of layer indexing) the number of layers and layer structure, etc. When the AI ​​partial model is a serial structure rather than a parallel structure, it becomes longer as the number of blocks or layers increases and the width of the blocks or layers increases.

[0370] Between the base station and the terminal It can be determined by the following two methods. As the first method, It can be defined as a fixed time depending on the size and complexity of the AI ​​partial model. That is, It can be expressed as, where c is the minimum number of slots required for model deactivation for the existing full AI model, update for the partial AI model, and model activation for the updated full AI model, and is the number of slots required to update and activate a specific AI model. This may vary depending on the size and complexity of the AI ​​part model to be updated.

[0371] FIG. 13a is defined above An example regarding this is illustrated. In the above example, block indexing-based AI partial model transmission is assumed. In the case of layer indexing-based AI partial model transmission as well, depending on the number and structure of layers can be defined differently. Referring to FIG. 13a, the AI ​​model is composed of B AI functional blocks (1301), each AI functional block having a different number of layers (1302) and dimensions (1303). That is, It can be, ...can satisfy ... As previously described, an AI partial model may include AI functional blocks or layers of a part of the entire AI model. Since each AI functional block in FIG. 13a has a different number of layers and dimensions, AI partial models that can be composed of a single or multiple AI functional blocks may have different numbers of blocks or different sizes and complexities. Therefore, weight updates, existing model deactivation, and updated model activation performed at the terminal according to the AI ​​partial model instructed by the base station may vary depending on the size of the transmitted partial AI model. That is, different depending on the instructed AI partial model It can have a value. For example, if the Bth AI functional block is used as an AI partial model as illustrated in Fig. 13a, the corresponding silver It can be defined as a number of slots (1304), and if the B-1st and Bth AI functional blocks are used as AI sub-models, the silver It can be defined as a number of slots (1305). If Ramen, regarding the AI ​​submodel composed of the Bth AI functional block and for an AI submodel composed of the Bth and B-1th AI functional blocks It becomes.

[0372] As a second method, It can be defined as the ratio of the time occupied by the AI ​​partial model to the time spent on weight updates, model deactivation, and activation for the entire AI model. That is, is, is the ratio of the AI ​​partial model to the entire AI model, and represents the time required to update weights for the entire AI model, deactivate the existing model, and activate the updated model. represents the time required from the end of model transmission to model activation for the entire AI model transmitted from the base station. Since the entire AI model is larger in size than the AI ​​partial model, silver It has a larger value. Generally, because the size of an AI partial model is much smaller compared to the entire AI model. It could be. Therefore, regarding the AI ​​partial model is for the entire AI model and a scaling factor less than 1 It can be expressed as.

[0373] The above scaling factor As an example, it can be defined not only as the ratio of time but also as the number of AI functional blocks occupied by the AI ​​submodel relative to the number of AI functional blocks of the entire AI model. In FIG. 13b, the entire AI model consists of B AI functional blocks (1311), and each AI functional block has the same number of layers. (1312) and dimension Assume that it has (1313). That is, is, It satisfies. Receiving a total of B functional blocks, the time required for weight updates and activating / deactivating the entire AI model When defined as (1314), the time taken to update one functional block is is (1315). Also, in proportion to the number of blocks For the AI ​​partial model composed of the B-1st block and the B block because this increases silver (1316). If layer indexing-based AI partial model transfer is utilized instead of block indexing, the number of layers of the entire AI model ( Number of layers in the AI ​​sub-model compared to ) )cast It can be used as (i.e., ).

[0374] <Fourth Example>: CSI report within

[0375] The fourth embodiment describes the time required from the end of AI partial model transmission to the activation of the updated model in the AI ​​partial model transmission-based CSI-RS compression transmission and reception method according to one embodiment of the present disclosure mentioned in FIG. 12. This relates to terminal behavior regarding channel state information reporting (CSI report). The terminal behavior may vary depending on the terminal capability (UE capability) for transmitting AI partial models. The terminal capability may include the terminal's AI hardware behavior. Specifically, when the terminal receives an AI partial model and updates weights, the CSI report behavior may vary depending on whether it can simultaneously perform inference operations using the existing full AI model.

[0376] FIGS. 14a and 14b illustrate the operation of a CSI report for a terminal in which the update of the AI ​​partial model and inference of the existing AI full model prior to the update can be performed simultaneously. It is assumed that the terminal capability (UE capability) for the above operation has been reported to the base station in advance. Referring to FIG. 14a, the AI ​​partial model is transmitted via MAC CE (1400), and the terminal can send a HARQ ACK (1401) for the transmitted MAC CE. Since the terminal is capable of updating the AI ​​partial model and inferring the existing AI model, it can perform CSI calculations regardless of the time (1402) when the update of the AI ​​partial model begins. That is, based on the model update start point, there may be cases where CSI calculations are performed before (1403) and cases where CSI calculations are performed after (1404). In such cases, because the terminal performed CSI calculations based on the existing AI model regardless of the AI ​​partial model update, During this time, the terminal can perform a report at the CSI report cycle instructed by the base station. That is, as illustrated in FIG. 14a, the terminal [receives] the calculated CSI It can report during that time. Also, the terminal Subsequently, when the updated model is activated (1405), the CSI for the channel inferred by the updated model can be reported (1407). FIG. 14b shows that the terminal During this time, CSI calculation (1410) is performed, and a CSI report for the calculated CSI is displayed. If there is a CSI calculated with a model that has not been updated in the CSI report period, the terminal Subsequently, the previously calculated CSI can be reported.

[0377] Fig. 14c is During this time, the terminal illustrates an example of skipping CSI reporting. In particular, the above example may be performed when the terminal's AI hardware cannot simultaneously perform AI partial model updates and inference of the existing AI model. Specifically, if the terminal's ability to simultaneously perform model updates and model inference is reported, the terminal disables the existing full AI model, updates the weights for the AI ​​partial model, and enables the updated full AI model. Consequently, inference cannot be performed with the disabled existing full AI model. Referring to FIG. 14c, the terminal cannot perform AI model inference from the point (1420) when it starts updating the AI ​​partial model, and CSI calculation is not performed either. In the case of the above terminal CSI reporting is not performed during this time. Afterward, when the updated AI full model is activated (1421), inference can be performed with the updated AI full model, and a CSI report can be performed (1422) through the calculation of CSI for the inferred channel.

[0378] FIG. 15 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0379] Referring to FIG. 15, the terminal may include a transceiver (1501), a memory (1502), and a processor (1503). 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 (1501), the memory (1502), and the processor (1503) may be implemented in the form of a single chip.

[0380] In one embodiment, the transceiver (1501) can transmit and receive signals with a base station. The above-described signal may include control information and data. To this end, the transceiver (1501) 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 (1501) may receive a signal through a wireless channel and output it to a processor (1503), and transmit the signal output from the processor (1503) through a wireless channel.

[0381] In one embodiment, the memory (1502) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1502) may store control information or data included in signals transmitted and received by the terminal. The memory (1502) may be composed of a storage medium or a combination of storage media such as ROM, RAM, a hard disk, CD-ROM, and DVD. Additionally, the memory (1502) may be composed of multiple memories. According to one embodiment, the memory (1502) may store a program for executing an operation for power saving of the terminal.

[0382] In one embodiment, the processor (1503) 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 (1503) can control the terminal to perform a generalization technique for a method of receiving compressed CSI-RS based on artificial intelligence partial model transmission by executing a program stored in memory (1502).

[0383] FIG. 16 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0384] Referring to FIG. 16, the base station may include a transceiver (1601), a memory (1602), and a processor (1603). 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 (1601), the memory (1602), and the processor (1603) may be implemented in the form of a single chip.

[0385] In one embodiment, the transceiver (1601) can transmit and receive signals with a terminal. The above-described signal may include control information and data. To this end, the transceiver (1601) 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 (1601) may receive a signal through a wireless channel and output it to a processor (1603), and transmit the signal output from the processor (1603) through a wireless channel.

[0386] In one embodiment, the memory (1602) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1602) may store control information or data included in signals transmitted and received by the terminal. The memory (1602) 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 (1602) may be composed of multiple memories. According to one embodiment, the memory (1602) may store a program for executing an operation for power saving of the terminal.

[0387] In one embodiment, the processor (1603) 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 (1603) can control the base station to perform a generalization technique for a method of compressing and transmitting a large volume of CSI-RS based on artificial intelligence partial model transmission by executing a program stored in memory (1602).

[0388] Methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0389] When implemented as 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 embodiments described in the claims or specification of this disclosure.

[0390] 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.

[0391] 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 the device performing the embodiment of the present disclosure through an external port. Additionally, a separate storage device on the communication network may be connected to the device performing the embodiment of the present disclosure.

[0392] 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.

[0393] 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

In a method of operation of a terminal in a wireless communication system, A step of receiving configuration information regarding at least one AI part model, which is a part of the entire AI (artificial intelligence) model for CSI (channel state information) reporting from a base station where weight updates are performed; A step of updating the AI ​​partial model based on instruction information of the AI ​​partial model and weight information of the AI ​​partial model included in the configuration information regarding the at least one AI partial model; and A method comprising the step of reporting a CSI obtained using a full AI model including the updated AI partial model to the base station. In paragraph 1, the instruction information of the AI ​​partial model is, Includes the index of each of some AI functional blocks among the multiple AI functional blocks constituting the entire AI model above, and The weight information of the above AI partial model is, A method comprising a weight corresponding to the index of each of the above-mentioned partial AI functional blocks. In paragraph 1, the instruction information of the AI ​​partial model is, Includes the index of each of some layers among the multiple layers constituting the entire AI model above, and The weight information of the above AI partial model is, It includes weights corresponding to the indices of each of the aforementioned partial layers, The configuration information regarding the above at least one AI partial model is, A method comprising at least one activation function information for some of the above layers. In paragraph 1, If the configuration information regarding at least one AI part model includes instruction information for a plurality of AI part models, the method comprises the step of receiving DCI (downlink control information) that indicates one of the plurality of AI part models; and A method further comprising the step of identifying the AI ​​part model among the plurality of AI part models based on the above DCI. In paragraph 1, The method further includes the step of transmitting a HARQ-ACK to the base station for receiving configuration information regarding at least one AI part model. The step of reporting the above CSI to the base station is, The time required from the time the above HARQ-ACK was transmitted until the updated AI partial model is activated and capable of inference. A method of reporting the above CSI to the base station based on the above. In paragraph 5, silver, Defined based on the size and complexity of the above AI partial model, or A method defined as the ratio of the time occupied by the AI ​​partial model to the time required for updating, deactivating, and activating weights for the entire AI model. In paragraph 5, Method during which CSI reporting is not performed. In a method of operating a base station in a wireless communication system, A step of transmitting configuration information regarding at least one AI part model, which is a part of the entire AI (artificial intelligence) model for CSI (channel state information) reporting to a terminal where weight updates are performed; and The method includes the step of receiving a CSI obtained from the terminal using an entire AI model including an AI part model updated based on configuration information regarding at least one AI part model, and A method in which the AI ​​part model is updated at the terminal based on instruction information of the AI ​​part model and weight information of the AI ​​part model included in configuration information regarding at least one AI part model. In a terminal of a wireless communication system, Transmitter / receiver; and It includes at least one processor connected to the above-mentioned transmitting and receiving unit, and the at least one processor is: Receive configuration information regarding at least one AI submodel, which is a part of the entire AI (artificial intelligence) model for CSI (channel state information) reporting from a base station where weight updates are performed, and Based on the instruction information of the AI ​​part model and the weight information of the AI ​​part model included in the configuration information regarding at least one AI part model, the AI ​​part model is updated, and A terminal that reports the CSI obtained using the entire AI model including the above-mentioned updated AI partial model to the base station. In paragraph 9, the instruction information of the above AI partial model is, Includes the index of each of some AI functional blocks among the multiple AI functional blocks constituting the entire AI model above, and The weight information of the above AI partial model is, A terminal comprising a weight corresponding to the index of each of the above-mentioned AI functional blocks. In paragraph 9, the instruction information of the above AI partial model is, Includes the index of each of some layers among the multiple layers constituting the entire AI model above, and The weight information of the above AI partial model is, It includes weights corresponding to the indices of each of the aforementioned partial layers, The configuration information regarding the above at least one AI partial model is, A terminal comprising at least one activation function information for some of the above layers. In paragraph 9, the above-mentioned at least one processor, If the configuration information regarding at least one AI part model includes instruction information for a plurality of AI part models, receive DCI (downlink control information) that indicates one of the plurality of AI part models, and A terminal that identifies the AI ​​part model among the plurality of AI part models based on the above DCI. In paragraph 9, the above-mentioned at least one processor, Transmit a HARQ-ACK for the reception of configuration information regarding at least one AI part model to the base station, and The time required from the time the above HARQ-ACK was transmitted until the updated AI partial model is activated and capable of inference. A terminal that reports the above CSI to the base station based on the above. In Paragraph 13, silver, Defined based on the size and complexity of the above AI partial model, or A terminal defined as the ratio of the time occupied by the AI ​​partial model to the time required for weight updates, deactivation, and activation of the entire AI model. In a base station of a wireless communication system, Transmitter / receiver; and It includes at least one processor connected to the above-mentioned transmitting and receiving unit, and the at least one processor is: Transmit configuration information regarding at least one AI submodel, which is a part of the entire AI (artificial intelligence) model for CSI (channel state information) reporting, to the terminal, and A CSI obtained using an entire AI model including an AI part model updated based on configuration information regarding at least one AI part model is received from the terminal, and A base station in which the AI ​​part model is updated at the terminal based on the instruction information of the AI ​​part model and the weight information of the AI ​​part model included in the configuration information regarding at least one AI part model.

Images