Method and apparatus for repeater using plurality of passbands in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Specifically, a method performed by a network-controlled repeater (NCR) of a wireless communication system comprises the steps of: transmitting, to a base station, capability information for a passband supportable by the NCR; and receiving, from the base station, higher layer signaling including configuration information for the passband, wherein the passband is a band including a backhaul and / or an access link of the NCR, and the capability information includes a band number for one or more passbands, at least one piece of frequency band resource information, and inter-band capability information and / or intra-band capability information of the NCR.

Description

Method and device for a repeater utilizing multiple passbands in a wireless communication system

[0001] The present disclosure relates to a communication method and device using a network control repeater for signal relay between a terminal and a base station 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 the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

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

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

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It could serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing this technology.

[0008] Currently, a network-controlled repeater (NCR) is being studied to control interference and increase the reliability of signal transmission through signal relay between base stations and terminals in wireless communication systems.

[0009] The present disclosure provides a method and device for applying multiple passbands in a network-controlled repeater (NCR) that processes signal relay between a base station and a terminal in a wireless communication system.

[0010] The present invention for solving the above problems is a method performed by an NCR (network-controlled repeater) of a wireless communication system, comprising the steps of: transmitting capability information on a passband that the NCR can support to a base station; and receiving, from the base station, upper layer signaling including configuration information on the passband, wherein the passband is a band including a backhaul or / and an access link of the NCR, and the capability information includes at least one of a band number and frequency band resource information for one or more passbands and inter-band capability information or / and intra-band capability information of the NCR.

[0011] In addition, a method performed by a base station of a wireless communication system comprises the steps of: receiving capability information on a passband that can be supported by an NCR (network-controlled repeater); and transmitting upper layer signaling including configuration information on the passband to the NCR, wherein the passband is a band including a backhaul or / and an access link of the NCR, and the capability information includes at least one of a band number and frequency band resource information for one or more passbands and inter-band capability information or / and intra-band capability information of the NCR.

[0012] In addition, in a network-controlled repeater (NCR) of a wireless communication system, the NCR comprises a transmitter / receiver; and a control unit configured to transmit capability information on a passband that the NCR can support to a base station and receive upper layer signaling including configuration information on the passband from the base station, wherein the passband is a band including a backhaul or / and an access link of the NCR, and the capability information includes at least one of a band number and frequency band resource information for one or more passbands and inter-band capability information or / and intra-band capability information of the NCR.

[0013] In addition, in a base station of a wireless communication system, a transmitter / receiver; and a control unit configured to receive capability information on a passband that can be supported by an NCR (network-controlled repeater) from the NCR, and transmit upper layer signaling including configuration information on the passband to the NCR, wherein the passband is a band including a backhaul or / and an access link of the NCR, and the capability information includes at least one of a band number and frequency band resource information for one or more passbands and inter-band capability information or / and intra-band capability information of the NCR.

[0014] According to various embodiments proposed in this disclosure, if a base station in a wireless communication system enables the NCR to perform frequency-selective amplification and transmission operations through control signaling, interference reduction and power consumption reduction can be achieved. Furthermore, if the NCR operates simultaneously in FR1 and FR2, performance and reliability can be enhanced.

[0015] Figure 1 is a diagram illustrating a time-frequency domain transmission structure of an LTE, LTE-Advanced, NR, or similar wireless communication system.

[0016] Figure 2 is a diagram illustrating the frame, subframe, and slot structure in a 5G system.

[0017] Figure 3 is a diagram illustrating an example of a bandwidth portion configuration in a wireless communication system.

[0018] Figure 4 is a diagram illustrating the structure of a downlink control channel of a wireless communication system.

[0019] FIG. 5 is a diagram illustrating an example of the structure of a downlink control channel of a wireless communication system.

[0020] Fig. 6 is a diagram illustrating an example of time-domain resource allocation of PDSCH in a wireless communication system.

[0021] Fig. 7 is a diagram illustrating an example of PDSCH time axis resource allocation in a wireless communication system.

[0022] FIG. 8 is a diagram illustrating an example of a semi-static HARQ (hybrid automatic repeat request)-ACK (acknowledgement) codebook setting method in an NR system.

[0023] FIG. 9 is a diagram illustrating an example of a method for setting a dynamic HARQ-ACK codebook in an NR system.

[0024] FIG. 10 is a diagram illustrating an example of a transmission and reception operation of an NCR when the NCR relays between a base station and a terminal according to an embodiment of the present disclosure.

[0025] FIG. 11A is a diagram illustrating an example of an NCR receiving a beam instruction for a periodic access link from a base station according to an embodiment of the present disclosure.

[0026] FIG. 11b is a diagram illustrating an example of an NCR receiving a beam indication for a semi-persistent access link from a base station according to an embodiment of the present disclosure.

[0027] FIG. 11c is a diagram illustrating an example of an NCR receiving a beam indication for an aperiodic access link from a base station according to an embodiment of the present disclosure.

[0028] FIG. 12 is a diagram illustrating an example of an NCR-MT band and passband according to one embodiment of the present disclosure.

[0029] FIG. 13 is a diagram illustrating an example of a capability report of an NCR including passband information according to an embodiment of the present disclosure.

[0030] FIG. 14 is a diagram illustrating an example of setting a passband and an access link beam index according to an embodiment of the present disclosure.

[0031] FIG. 15 is a diagram illustrating an example of an independent passband indication according to one embodiment of the present disclosure.

[0032] FIG. 16 is a flowchart illustrating an example of the operation of an NCR performing at least one embodiment of the present disclosure.

[0033] FIG. 17 is a flowchart illustrating an example of the operation of a base station performing at least one embodiment of the present disclosure.

[0034] FIG. 18 is a block diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0035] FIG. 19 is a block diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0036] FIG. 20 is a block diagram illustrating the structure of an NCR in a wireless communication system according to an embodiment of the present disclosure.

[0037] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0038] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to more clearly convey the gist of the present disclosure without obscuring it by omitting unnecessary explanations.

[0039] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0040] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments of the present disclosure are provided only to make the present disclosure complete and to fully inform those skilled in the art of the scope of the invention, and the present disclosure is defined only by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

[0041] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, so that the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also be able to provide steps for performing the functions described in the flowchart block(s).

[0042] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0043] Here, the term '~ unit' used in the present embodiment means software or hardware components such as FPGA (field programmable gate array) or ASIC (application specific integrated circuit), and the '~ unit' performs certain roles. However, the '~ unit' is not limited to software or hardware. The '~ unit' may be configured to be on an addressable storage medium and may be configured to play one or more processors. Accordingly, according to some embodiments, the '~ unit' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, 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 '~ units' may be combined into a smaller number of components and '~ units' or further separated into additional components and '~ units'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within the device or secure multimedia card. Furthermore, according to some embodiments, the '~parts' may include one or more processors.

[0044] Hereinafter, the operating principle of the present invention will be described in detail with reference to the attached drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions in the present invention, and these may vary depending on the intention or custom of the user or operator. Therefore, the definitions should be made based on the contents throughout this specification. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (base station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (user equipment), an MS (mobile station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Of course, the present invention is not limited to the above examples. Hereinafter, the present disclosure describes a technology for a terminal to receive broadcast information from a base station in a wireless communication system. The present disclosure is applicable to 4G (4G) th 5G (5 generation) system to support higher data rates th The present disclosure relates to a communication technique and system that fuses a 5G communication system with IoT (Internet of Things) technology. The present disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.) based on 5G communication technology and IoT-related technologies.

[0045] In the following description, terms referring to broadcast information, terms referring to control information, terms related to communication coverage, terms referring to state changes (e.g., events), terms referring to network entities, terms referring to messages, terms referring to device components, etc. are examples for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

[0046] For convenience of explanation below, some terms and names defined in the 3GPP (3rd generation partnership project) LTE (long term evolution) standard and NR (New radio) standard may be used. However, the present invention is not limited to the above terms and names, and can be equally applied to systems conforming to other standards.

[0047] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 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.

[0048] The LTE system, a representative example of a broadband wireless communication system, adopts the orthogonal frequency division multiplexing (OFDM) method in the downlink (DL) and the single carrier frequency division multiple access (SC-FDMA) method in the uplink (UL). The uplink refers to a wireless link through which a terminal or MS transmits data or control signals to a base station, and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. The above multiple access method allocates and operates the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so as to achieve orthogonality, thereby distinguishing the data or control information of each user.

[0049] As a future communication system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers, and thus support services that satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable low-latency communication (URLLC).

[0050] In some embodiments, eMBB aims to provide data rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB should be able to provide a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. At the same time, it should provide an increased user-perceived data rate for the terminal. To meet these requirements, improvements in transmission and reception technologies, including further enhanced multi-input multiple-output (MIMO) transmission technology, are required. In addition, the data rates required by 5G communication systems can be met by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz frequency band instead of the 2 GHz band used by the current LTE.

[0051] At the same time, mMTC is being considered to support application services such as the Internet of Things in 5G communication systems. To efficiently provide the Internet of Things, mMTC may require support for connection of a large number of terminals within a cell, improved terminal coverage, improved battery life, and reduced terminal costs. The Internet of Things provides communication functions by attaching various sensors and various devices, so a large number of terminals (e.g., 1,000,000 terminals / km) are required within a cell. 2) must be able to support. Furthermore, terminals supporting mMTC are likely to be located in shadow areas not covered by cells, such as basements of buildings, due to the nature of the service, and thus may require wider coverage than other services provided by 5G communication systems. Terminals supporting mMTC must be comprised of low-cost terminals, and because frequent replacement of terminal batteries is difficult, very long battery life times may be required.

[0052] Finally, URLLC is a cellular-based wireless communication service used for mission-critical purposes, such as remote control of robots or machinery, industrial automation, unmanaged aerial vehicles, remote health care, and emergency alerts, and must provide ultra-low latency and ultra-reliable communication. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must provide a 10 -5 The following packet error rate requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller transmit time interval (TTI) than other services, while simultaneously allocating a wide range of resources in the frequency band. However, the aforementioned mMTC, URLLC, and eMBB are merely examples of different service types, and the service types applicable to this disclosure are not limited to the aforementioned examples.

[0053] The services considered in the aforementioned 5G communication system should be integrated and provided based on a single framework. In other words, for efficient resource management and control, it is desirable for each service to be integrated, controlled, and transmitted as a single system, rather than operated independently.

[0054] Furthermore, while embodiments of the present disclosure are described below using LTE, LTE-A, LTE Pro, or NR systems as examples, the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Furthermore, the embodiments of the present disclosure may be applied to other communication systems with some modifications, as determined by a person skilled in the art, without significantly departing from the scope of the present disclosure.

[0055] Below, the frame structure of the 5G system is described in more detail with reference to the drawings.

[0056] Figure 1 is a diagram illustrating an example of the basic structure of time-frequency resources of a wireless communication system.

[0057] Referring to Figure 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of resources is a resource element (RE, 1-01), which can be defined as 1 OFDM symbol (1-02) on the time axis and 1 subcarrier (1-03) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can form one resource block (RB, 1-04). In one embodiment, multiple OFDM symbols can form one subframe (subframe, 1-10).

[0058] FIG. 2 is a diagram illustrating an example of a frame, subframe, and slot structure of a wireless communication system.

[0059] Referring to FIG. 2, one frame (frame, 2-00) may be composed of one or more subframes (2-01), and one subframe may be composed of one or more slots (slots, 2-02). For example, one frame (2-00) may be defined as 10ms. One subframe (2-01) may be defined as 1ms, in which case one frame (2-00) may be composed of a total of 10 subframes (2-01). One slot (2-02, 2-03) may be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( )=14). 1 subframe (2-01) can be composed of one or more slots (2-02, 2-03), and the number of slots (2-02, 2-03) per 1 subframe (2-01) can vary depending on the setting value μ (2-04, 2-05) for the subcarrier spacing. In the example of Fig. 2, the cases where μ = 0 (2-04) and μ = 1 (2-05) as the subcarrier spacing setting value are illustrated. When μ = 0 (2-04), 1 subframe (2-01) can be composed of 1 slot (2-02), and when μ = 1 (2-05), 1 subframe (2-01) can be composed of 2 slots (2-03). That is, the number of slots per 1 subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as shown in Table 1 below.

[0060] μ 0141011142022144043148084141601651432032

[0061] In NR systems, a single component carrier (CC) or serving cell can consist of up to 250 RBs. Therefore, if a UE constantly receives the entire serving cell bandwidth, as in LTE, power consumption can be extreme. To address this, the base station can configure one or more bandwidth portions (BWPs) for the UE, allowing the UE to change its reception area within the cell.

[0062] In the NR system, a base station can set an initial bandwidth portion (initial BWP), which is the bandwidth of control resource set (CORESET) #0 (or common search space (CSS)), to a terminal through a master information block (MIB). Specifically, the terminal can receive configuration information about a control region and a search space on which a physical downlink control channel (PDCCH) can be transmitted, in order to receive system information required for initial access (which may correspond to remaining system information (RMSI) or system information block 1 (SIB1)) through the MIB transmitted on a physical broadcast channel (PBCH) during the initial access phase. The control region and search space configured by the MIB may each be regarded as identity (ID) 0.

[0063] The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control area #0 through MIB. In addition, the base station can notify the terminal of configuration information for monitoring cycle and occasion for control area #0, i.e. configuration information for search space #0, through MIB. The terminal can regard the frequency area set as control area #0 obtained from the MIB as the initial bandwidth part for initial access. At this time, the identifier (ID) of the initial bandwidth part can be regarded as 0. In addition to receiving SIB, the initial bandwidth part can also be utilized for other system information (OSI), paging, and random access.

[0064] Afterwards, the base station can set the initial BWP (first BWP) of the terminal through RRC (radio resource control) signaling and notify at least one or more BWP configuration information that can be indicated through downlink control information (DCI) in the future. Afterwards, the base station can indicate which band the terminal will use by notifying the BWP ID through DCI. If the terminal does not receive DCI in the currently allocated BWP for a certain period of time, the terminal reverts to the default bandwidth part (default BWP) and attempts to receive DCI.

[0065] FIG. 3 is a diagram illustrating an example of a bandwidth part (BWP) configuration in a wireless communication system.

[0066] Referring to FIG. 3, FIG. 3 illustrates an example in which a terminal bandwidth (3-00) is set to two bandwidth segments, namely bandwidth segment #1 (3-05) and bandwidth segment #2 (3-10). The base station can set one or more bandwidth segments to the terminal, and can set information such as Table 2 below for each bandwidth segment.

[0067] BWP ::= SEQUENCE {bwp-Id BWP-Id,(bandwidth part identifier)locationAndBandwidth INTEGER (1..65536),(bandwidth part location)subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},(subcarrier spacing)cyclicPrefix ENUMERATED { extended}(cyclic prefix)}

[0068] Of course, the above-described examples are not limited, and in addition to the above-described configuration information, various parameters related to the bandwidth portion may be configured for the terminal. The above-described information may be transmitted from the base station to the terminal via upper layer signaling, such as RRC signaling. At least one of the configured bandwidth portions may be activated. Whether or not the configured bandwidth portion is activated may be semi-statically transmitted from the base station to the terminal via RRC signaling, or dynamically transmitted via MAC (medium access control) CE (control element) or DCI.

[0069] The settings for the bandwidth part supported by the above-described NR system can be used for various purposes.

[0070] For example, if the bandwidth supported by a terminal is smaller than the system bandwidth, the bandwidth supported by the terminal can be supported through bandwidth configuration. For example, in Table 2, by setting the frequency position (configuration information 2) of the bandwidth portion to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

[0071] As another example, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured to utilize subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency division multiplexed (FDM), and when data is to be transmitted or received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0072] As another example, to reduce power consumption of a terminal, a base station can configure bandwidth segments with different bandwidth sizes for the terminal. For example, if a terminal supports a very large bandwidth, such as 100 MHz, and constantly transmits and receives data within that bandwidth, this can result in significant power consumption. In particular, in situations where there is no traffic, it is highly inefficient from a power consumption perspective for the terminal to monitor unnecessary downlink control channels within a bandwidth as large as 100 MHz. Therefore, to reduce power consumption, the base station can configure a relatively small bandwidth segment, such as 20 MHz, for the terminal. In situations where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth segment, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth segment according to the base station's instructions.

[0073] Below, the SS (synchronization signal) / PBCH block (or SSB (synchronization signal block)) of the NR system is described.

[0074] An SS / PBCH block may refer to a physical layer channel block consisting of a primary SS (PSS), a secondary SS (SSS), and a PBCH. More specifically, an SS / PBCH block may be defined as follows.

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

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

[0077] - PBCH: This channel can provide essential system information required for transmission and reception of data and control channels of a terminal. Essential system information may include search space-related control information indicating radio resource mapping information for the control channel, and scheduling control information for a separate data channel that transmits system information.

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

[0079] The terminal can detect PSS and SSS and decode PBCH in the initial access stage. The terminal can obtain MIB from PBCH and configure control region #0 through MIB. The terminal can monitor control region #0 assuming that the selected SS / PBCH block and the demodulation reference signal (DMRS) transmitted in control region #0 are quasi-co-located (QCL). The terminal can receive system information through downlink control information transmitted in control region #0. The terminal can obtain RACH (random access channel) related configuration information required for initial access from the received system information. The terminal can transmit PRACH (physical RACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information about the SS / PBCH block index selected by the terminal. The base station can know which block the terminal has selected from each SS / PBCH block and monitor the control region #0 corresponding to (or associated with) the SS / PBCH block selected by the terminal.

[0080] Below, downlink control information (DCI) in the NR system is described in detail.

[0081] In an NR system, scheduling information for uplink data (or physical uplink shared channel, PUSCH) or downlink data (or physical downlink shared channel, PDSCH) can be transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields predefined between the base station and the terminal, and the DCI format for non-fallback can include configurable fields.

[0082] DCI can be transmitted over the physical downlink control channel (PDCCH) after going through channel coding and modulation processes. A cyclic redundancy check (CRC) can be attached to the DCI message payload, and the CRC can be scrambled with a radio network temporary identifier (RNTI) corresponding to the identity of the UE. Depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response, different RNTIs can be used to scramble the CRC attached to the DCI message payload. That is, the RNTI can be included in the CRC calculation process rather than being transmitted explicitly. When a DCI message transmitted over the PDCCH is received, the UE can verify the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can know that the message was transmitted to the UE.

[0083] For example, a DCI scheduling a PDSCH for system information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a random access response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a paging message may be scrambled with P-RNTI. A DCI notifying a slot format indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a transmit power control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (cell RNTI).

[0084] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with the C-RNTI. In one embodiment, DCI format 0_0 with the CRC scrambled with the C-RNTI can include information as shown in Table 3 below.

[0085] - Identifier for DCI formats - [1] bit- Frequency domain resource assignment - [ ] bits- Time domain resource assignment - X bits- Frequency hopping flag - 1 bit.- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- TPC command for scheduled PUSCH - [2] bits- UL / SUL indicator (uplink / supplementary UL indicator) - 0 or 1 bit

[0086] DCI format 0_1 ​​can be used as a non-fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. In one embodiment, DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include information as shown in Table 4 below.

[0087] - Carrier indicator - 0 or 3 bits- UL / SUL indicator - 0 or 1 bit- Identifier for DCI formats - [1] bits- Bandwidth part indicator - 0, 1, or 2 bits- Frequency domain resource assignment- For resource allocation type 0 bits- For resource allocation type 1, bits- Time domain resource assignment -1, 2, 3, or 4 bits- VRB-to-PRB mapping (virtual resource block-to-physical resource block mapping) - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- Frequency hopping flag - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- 1st downlink assignment index (first downlink allocation index)- 1 or 2 bits○ 1 bit for semi-static HARQ-ACK codebook (semi-static HARQ-ACK In case of codebook);○ 2 bits for dynamic HARQ-ACK codebook with single HARQ-ACK codebook(When dynamic HARQ-ACK codebook is used with single HARQ-ACK codebook).- 2nd downlink assignment index (2nd downlink assignment index) - 0 or 2 bits○ 2 bits for dynamic HARQ-ACK codebook with two HARQ-ACK sub-codebooks(When dynamic HARQ-ACK codebook is used with two HARQ-ACK sub-codebooks);○ 0 bit otherwise.TPC command for scheduled PUSCH - 2 bits- SRS resource indicator (SRS resource indicator) -. or bits○ bits for non-codebook based PUSCH transmission; ○ bits for codebook based PUSCH transmission. - Precoding information and number of layers - up to 6 bits - Antenna ports - up to 5 bits - SRS request - 2 bits - CSI request - 0, 1, 2, 3, 4, 5, or 6 bits - CBG transmission information - 0, 2, 4, 6, or 8 bits - PTRS-DMRS association (Phase tracking reference signal-demodulation reference signal relationship) - 0 or 2 bits - beta_offset indicator - 0 or 2 bits - DMRS sequence initialization - 0 or 1 bit

[0088] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with the C-RNTI. In one embodiment, DCI format 1_0 with the CRC scrambled with the C-RNTI can include information as shown in Table 5 below.

[0089] - Identifier for DCI formats - [1] bit- Frequency domain resource assignment -[ ] bits- Time domain resource assignment - X bits- VRB-to-PRB mapping - 1 bit.- Modulation and coding scheme - 5 bits- New data indicator - 1 bit- Redundancy version - 2 bits- HARQ process number - 4 bits- Downlink assignment index - 2 bits- TPC command for scheduled PUCCH - [2] bits- PUCCH resource indicator (physical uplink control channel, PUCCH) - 3 bits- PDSCH-to-HARQ feedback timing indicator (PDSCH-to-HARQ feedback timing indicator) - [3] bits

[0090] Alternatively, DCI format 1_0 can be used as DCI for scheduling PDSCH for RAR message, in which case the CRC can be scrambled with RA-RNTI. DCI format 1_0 with CRC scrambled with RA-RNTI can include information as shown in Table 6 below.

[0091] - Frequency domain resource assignment - bits- Time domain resource assignment - 4 bits- VRB-to-PRB mapping - 1 bit- Modulation and coding scheme - 5 bits- TB scaling - 2 bits- Reserved bits - 16 bits

[0092] DCI format 1_1 can be used as a non-fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. In one embodiment, DCI format 1_1 with the CRC scrambled with C-RNTI can include information as shown in Table 7 below.

[0093] - Carrier indicator - 0 or 3 bits- Identifier for DCI formats - [1] bits- Bandwidth part indicator - 0, 1 or 2 bits- Frequency domain resource assignment○ For resource allocation type 0, bits○ For resource allocation type 1, bits- Time domain resource assignment -1, 2, 3, or 4 bits- VRB-to-PRB mapping - 0 or 1 bit, only for resource allocation type 1.○ 0 bit if only resource allocation type 0 is configured;○ 1 bit otherwise.- PRB bundling size indicator - 0 or 1 bit - Rate matching indicator - 0, 1, or 2 bits - ZP CSI-RS trigger - 0, 1, or 2 bits For transport block 1 (for the first transport block): - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits For transport block 2 (for the second transport block): - Modulation and coding scheme - 5 bits - New data indicator - 1 bit - Redundancy version - 2 bits - HARQ process number - 4 bits - Downlink assignment index - 0 or 2 or 4 bits - TPC command for scheduled PUCCH - 2 bits - PUCCH resource indicator - 3 bits - PDSCH-to-HARQ_feedback timing indicator - 3 bits - Antenna ports - 4, 5, or 6 bits- Transmission configuration indication - 0 or 3 bits- SRS request - 2 bits- CBG transmission information - 0, 2, 4, 6, or 8 bits- CBG flushing out information - 0 or 1 bit- DMRS sequence initialization - 1 bit.

[0094] Figure 4 is a diagram illustrating an example of the structure of a downlink control channel in a wireless communication system. In particular, Figure 4 illustrates an example of the basic units of time and frequency resources that constitute a downlink control channel that can be used in a 5G system.

[0095] Referring to Fig. 4, the basic unit of time and frequency resources constituting the control channel can be defined as a REG (resource element group, 4-03). A REG (4-03) can be defined as 1 OFDM symbol (4-01) on the time axis and 1 PRB (physical resource block, 4-02) on the frequency axis, i.e., 12 subcarriers. A base station can concatenate REGs (4-03) to form a downlink control channel allocation unit.

[0096] As illustrated in FIG. 4, if the basic unit to which a downlink control channel is allocated in a 5G system is called a CCE (control channel element, 4-04), 1 CCE (4-04) can be composed of multiple REGs (4-03). For example, the REG (4-03) illustrated in FIG. 4 can be composed of 12 REs, and if 1 CCE (4-04) is composed of 6 REGs (4-03), 1 CCE (4-04) can be composed of 72 REs. When a downlink control region is established, the region can be composed of multiple CCEs (4-04), and a specific downlink control channel can be mapped to one or multiple CCEs (4-04) and transmitted according to the aggregation level (AL) within the control region. CCEs (4-04) within the control area are distinguished by numbers, and the numbers of CCEs (4-04) can be assigned according to a logical mapping method.

[0097] The basic unit of the downlink control channel illustrated in Fig. 4, that is, REG (4-03), may include both REs to which DCI is mapped and areas to which DMRS (4-05), which is a reference signal for decoding the REs, is mapped. As shown in Fig. 4, three DMRSs (4-05) may be transmitted within one REG (4-03). The number of CCEs required to transmit a 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.

[0098] A terminal must detect a signal without knowing information about the downlink control channel. For blind decoding, a search space representing a set of CCEs can be defined. The search space is a set of downlink control channel candidates, consisting of CCEs that the terminal should attempt to decode at a given aggregation level. Since there are various aggregation levels that create a single bundle of 1, 2, 4, 8, or 16 CCEs, the terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0099] The search space can be classified into a common search space and a UE-specific search space. According to one embodiment of the present disclosure, a certain group of terminals or all terminals can search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages for system information.

[0100] For example, a terminal can receive PDSCH scheduling allocation information for transmitting a SIB, including cell operator information, by examining a common search space of a PDCCH. In the case of a common search space, since a certain group of terminals or all terminals must receive the PDCCH, the common search space can be defined as a set of pre-arranged CCEs. Meanwhile, a terminal can receive scheduling allocation information for a terminal-specific PDSCH or PUSCH by examining a terminal-specific search space of a PDCCH. The terminal-specific search space can be defined terminal-specifically as a function of the terminal's identity and various system parameters.

[0101] In a 5G system, parameters for a search space for PDCCH can be configured from a base station to a terminal via higher-layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot 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 corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the above-described configuration may include information such as Table 8 below.

[0102] SearchSpace ::= SEQUENCE {-- Identity of the search space. SearchSpaceId = 0 identifies the SearchSpace configured via PBCH (MIB) or ServingCellConfigCommon.searchSpaceId SearchSpaceId,(search space identifier)controlResourceSetId ControlResourceSetId,(control space identifier)monitoringSlotPeriodicityAndOffset CHOICE {(monitoring slot level period)sl1 NULL,sl2 INTEGER (0..1),sl4 INTEGER (0..3),sl5 INTEGER (0..4),sl8 INTEGER (0..7),sl10 INTEGER (0..9),sl16 INTEGER (0..15),sl20 INTEGER (0..19)} OPTIONAL,duration(monitoring length) INTEGER (2..2559)monitoringSymbolsWithinSlot BIT STRING (SIZE (14)) OPTIONAL,(슬롘 내 나이스 심보)nrofCandidates SEQUENCE {(집성 별보 PDCCH 이리군 수)aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel4 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel8 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8},aggregationLevel16 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}},searchSpaceType CHOICE {(தமம்ப்புக்குக்கு திய்து)-- Configures this search space as common search space (CSS) and DCI formats to monitor.common SEQUENCE {(공통이이국이)}ue-Specific SEQUENCE {(단말-특정이스국)-- Indicates whether the UE monitors in this USS for DCI formats 0-0 and 1-0 or for formats 0-1 and 1-1.formats ENUMERATED {formats0-0-And-1-0, formats0-1-And-1-1},...}.

[0103] Based on the configuration information, the base station can configure one or more search space sets for the terminal. According to one embodiment of the present disclosure, the base station can configure the terminal with search space set 1 and search space set 2, and configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0104] According to the configuration information, one or more search space sets 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 terminal-specific search spaces.

[0105] The common search space can be categorized into specific types of search space sets based on their purpose. The RNTIs to be monitored may differ for each type of search space set. For example, the common search space type, purpose, and RNTIs to be monitored can be categorized as shown in Table 9 below.

[0106] Search space type Purpose RNTIType0 CSS PDCCH transmission for SIB scheduling SI-RNTIType0A CSS PDCCH transmission for SI scheduling other than SIB1 (such as SIB2) SI-RNTIType1 CSS PDCCH transmission for RAR scheduling, Msg3 retransmission scheduling, Msg4 scheduling RA-RNTI, TC-RNTIType2 CSS Paging P-RNTIType3 CSS Group control information transmission INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI PDCCH transmission for data scheduling in case of PCell C-RNTI, MCS-C-RNTI, CS-RNTI

[0107] Meanwhile, in the common search space, the following DCI formats and RNTI combinations can be monitored. Of course, the examples below are not limited to these.

[0108] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0109] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0110] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0111] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0112] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0113] In a terminal-specific search space, the following DCI formats and RNTI combinations can be monitored, although the examples below are not limited.

[0114] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0115] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0116] The RNTIs specified may follow the definitions and uses below.

[0117] - C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0118] - TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes.

[0119] - CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0120] - RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0121] - P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0122] - SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0123] - INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0124] - TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0125] - TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH (physical uplink control channel).

[0126] - TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0127] In one embodiment, the DCI formats described above may be defined as shown in Table 10 below.

[0128] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0129] According to one embodiment of the present disclosure, in a 5G system, multiple search space sets may be set with different parameters (e.g., parameters in Table 8). Accordingly, the set of search space sets monitored by a terminal at each point in time may be different. For example, if search space set #1 is set with an X-slot period and search space set #2 is set with a Y-slot period and X and Y are different, the terminal may monitor both search space set #1 and search space set #2 in a specific slot, and may monitor either search space set #1 or search space set #2 in a specific slot.

[0130] Below, time and frequency resource allocation methods for data transmission in NR systems are described.

[0131] In addition to frequency domain resource candidate allocation through BWP indication, the NR system may provide the following detailed frequency domain resource allocation methods (frequency domain resource allocation, FD-RA).

[0132] FIG. 5 is a diagram illustrating an example of frequency-axis resource allocation of PDSCH in a wireless communication system.

[0133] Figure 5 is a diagram illustrating three frequency axis resource allocation methods that can be set through an upper layer in an NR system: type 0 (5-00), type 1 (5-05), and dynamic switch (5-10).

[0134] Referring to Figure 5, if the terminal is configured to use only resource type 0 through upper layer signaling (5-00), some downlink control information (DCI) that allocates PDSCH to the terminal is N RBG We have a bitmap consisting of N bits. The conditions for this will be explained later. In this case, N RBG refers to the number of RBGs (resource block groups) determined as shown in Table 11 below according to the BWP size allocated by the BWP indicator and the upper layer parameter rbg-Size, and data is transmitted to the RBG indicated as 1 by the bitmap.

[0135] Bandwidth Part SizeConfiguration 1Configuration 21-362437-724873-144816145-2751616

[0136] If the terminal is configured to use only resource type 1 through upper layer signaling (6-05), some DCIs that allocate PDSCH to the terminal It has frequency axis resource allocation information consisting of bits. The conditions for this will be explained later. Through this, the base station can set the starting VRB (6-20) and the length of frequency axis resources (6-25) allocated continuously from it.

[0137] If a terminal is configured to use both resource type 0 and resource type 1 through upper layer signaling (5-10), some DCIs that allocate PDSCH to the terminal have frequency-axis resource allocation information consisting of bits of the larger value (5-35) among the payload (5-15) for configuring resource type 0 and the payload (5-20, 5-25) for configuring resource type 1. The conditions for this will be explained later. At this time, one bit can be added to the most significant bit (MSB) of the frequency-axis resource allocation information in the DCI, and if the bit is 0, it can indicate that resource type 0 is used, and if it is 1, it can indicate that resource type 1 is used.

[0138] Below, a time domain resource allocation method for data channels in an NR system is described.

[0139] A base station can set up a table for time domain resource allocation information for a downlink data channel (PDSCH) and an uplink data channel (PUSCH) to a terminal via higher layer signaling (e.g., RRC signaling). A table with up to maxNrofDL-Allocations=16 entries can be set up for the PDSCH, and a table with up to maxNrofUL-Allocations=16 entries can be set up for the PUSCH. In one embodiment, the time domain resource allocation information may include PDCCH-to-PDSCH slot timing (corresponding to the time interval in slot units between the time point of receiving a PDCCH and the time point of transmitting a PDSCH scheduled by the received PDCCH, denoted as K0), PDCCH-to-PUSCH slot timing (corresponding to the time interval in slot units between the time point of receiving a PDCCH and the time point of transmitting a PUSCH scheduled by the received PDCCH, denoted as K2), information on the position and length of the start symbol for which a PDSCH or PUSCH is scheduled within a slot, the mapping type of the PDSCH or PUSCH, etc. For example, information such as Table 12 or Table 13 below may be notified from the base station to the terminal.

[0140] PDSCH-TimeDomainResourceAllocationList information elementPDSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofDL-Allocations)) OF PDSCH-TimeDomainResourceAllocationPDSCH-TimeDomainResourceAllocation ::= SEQUENCE {k0 INTEGER(0..32) OPTIONAL, -- Need S(PDCCH-to-PDSCH timing, in slot units)mappingType ENUMERATED {typeA, typeB},(PDSCH mapping type)startSymbolAndLength INTEGER (0..127)(PDSCH start symbol and length)}

[0141] PUSCH-TimeDomainResourceAllocationinformation elementPUSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF PUSCH-TimeDomainResourceAllocationPUSCH-TimeDomainResourceAllocation ::= SEQUENCE {k2 INTEGER(0..32) OPTIONAL, -- Need S(PDCCH-to-PUSCH timing, in slot units)mappingType ENUMERATED {typeA, typeB},(PUSCH mapping type)startSymbolAndLength INTEGER (0..127)(PUSCH start symbol and length)}

[0142] The base station can notify the terminal of one of the entries in the table for the time domain resource allocation information described above via L1 signaling (e.g., DCI) (e.g., it can be indicated by the 'time domain resource allocation' field in the DCI). The terminal can obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

[0143] Fig. 6 is a diagram illustrating an example of time domain resource allocation of PDSCH in a wireless communication system.

[0144] Referring to FIG. 6, the base station uses the upper layer to set the subcarrier spacing (SCS, μ) of the data channel and the control channel. PDSCH , μ PDCCH ), slot offset (K0) value, and the time axis position of the PDSCH resource can be indicated according to the OFDM symbol start position (6-00) and length (6-05) within a slot that are dynamically indicated through DCI.

[0145] FIG. 7 is a diagram illustrating an example of time-domain resource allocation according to the subcarrier spacing of a data channel and a control channel in a wireless communication system.

[0146] Referring to Figure 7, when the subcarrier spacing of the data channel and the control channel are the same (7-00, μ PDSCH = μ PDCCH ), since the slot numbers for data and control are the same, the base station and the terminal can see that a scheduling offset occurs according to the predetermined slot offset K0. On the other hand, when the subcarrier spacing of the data channel and the control channel are different (7-05, μ PDSCH ≠ μPDCCH ), since the slot numbers for data and control are different, the base station and the terminal can see that the scheduling offset occurs in accordance with the predetermined slot offset K0 based on the subcarrier spacing of the PDCCH.

[0147] Below, we describe the quasi co-location (QCL) and transmission configuration indication (TCI) states.

[0148] In a wireless communication system, one or more different antenna ports (or one or more channels, signals, and combinations thereof, but for convenience, they will be referred to as different antenna ports in the following description of the present disclosure) can be associated with each other by a QCL (quasi co-location) setting as shown in Table 14 below. The TCI state is to notify the QCL relationship between the PDCCH (or PDCCH DMRS) and other RSs or channels. When a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are QCLed with each other, it means that the terminal is allowed to apply some or all of the large-scale channel parameters estimated at the antenna port A to the channel measurement from the antenna port B. QCL may need to relate different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Accordingly, NR supports four types of QCL relationships, as shown in Table 14 below.

[0149] QCL typeLarge-scale characteristicsADoppler shift, Doppler spread, average delay, delay spreadBDoppler shift, Doppler spreadCDoppler shift, average delayDSpatial Rx parameter

[0150] The above spatial RX parameter may collectively refer to some or all of various parameters, such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0151] The above QCL relationship can be set to the terminal through the RRC parameters TCI-State and QCL-Info as shown in Table 15 below. Referring to Table 15, the base station can set one or more TCI states to the terminal and inform the RS referencing the ID of the TCI state, i.e., up to two QCL relationships (qcl-Type1, qcl-Type2) for the target RS. At this time, each QCL information (QCL-Info) included in the above TCI state includes the serving cell index and BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 15 above.

[0152] TCI-State ::= SEQUENCE {tci-StateId TCI-StateId,(ID of the corresponding TCI state)qcl-Type1 QCL-Info,(QCL information of the first reference RS of the RS (target RS) referencing the corresponding TCI state ID)qcl-Type2 QCL-Info OPTIONAL, -- Need R(QCL information of the second reference RS of the RS (target RS) referencing the corresponding TCI state ID)...}QCL-Info ::= SEQUENCE {cell ServCellIndex OPTIONAL, -- Need R(serving cell index of the reference RS pointed to by the corresponding QCL information)bwp-Id BWP-Id OPTIONAL, -- Cond CSI-RS-Indicated(BWP index of the reference RS pointed to by the corresponding QCL information)referenceSignal CHOICE {csi-rs NZP-CSI-RS-ResourceId,ssb SSB-Index(CSI-RS pointed to by the corresponding QCL information (channel state information reference signal) ID or SSB ID)},qcl-Type ENUMERATED {typeA, typeB, typeC, typeD},...}

[0153] Below, we describe in detail the QCL priority determination operation for PDCCH.

[0154] When a terminal operates in a single cell or in carrier aggregation (CA) within a band, and multiple control regions within an activated bandwidth portion of a single or multiple cells have the same or different QCL-TypeD characteristics and overlap in time during a specific PDCCH monitoring interval, the terminal may select a specific control region according to a QCL priority determination operation and monitor control regions having the same QCL-TypeD characteristics as the selected control region. That is, when multiple control regions overlap in time, only one QCL-TypeD characteristic can be received. In this case, the criteria for determining the QCL priority may be as follows.

[0155] - Criterion 1. Control area connected to the common search section of the lowest index within the cell corresponding to the lowest index among the cells containing the common search space (CSS).

[0156] - Criterion 2. A control area connected to the terminal-specific search section of the lowest index within the cell corresponding to the lowest index among the cells containing the terminal-specific search space (USS).

[0157] As described above, if the above criteria are not met, the following criteria apply. For example, if control regions overlap in time in a specific PDCCH monitoring interval, and if not all control regions are connected to a common search interval but to a terminal-specific search interval, i.e., if Criterion 1 is not met, the terminal may skip applying Criterion 1 and apply Criterion 2.

[0158] When a terminal selects a control region based on the above-described criteria, the terminal may additionally consider the following two items regarding the QCL information set in the control region. First, if control region 1 has CSI-RS 1 as a reference signal having a QCL-TypeD relationship, and if the reference signal of this CSI-RS 1 having a QCL-TypeD relationship is SSB 1, and another control region 2 has a reference signal having a QCL-TypeD relationship that is SSB 1, the terminal may consider that these two control regions 1 and 2 have different QCL-TypeD characteristics. Second, if control region 1 has CSI-RS 1 set in cell 1 as a reference signal having a QCL-TypeD relationship, and the reference signal of this CSI-RS 1 having a QCL-TypeD relationship is SSB 1, and control region 2 has CSI-RS 2 set in cell 2 as a reference signal having a QCL-TypeD relationship, and the reference signal of this CSI-RS 2 having a QCL-TypeD relationship is the same SSB 1, the terminal can consider that the two control regions have the same QCL-TypeD characteristic.

[0159] Below, we describe the HARQ-ACK (hybrid automatic repeat request - acknowledgement) feedback transmission method.

[0160] The NR system employs the HARQ scheme, which retransmits the data at the physical layer if a decoding failure occurs during the initial transmission. HARQ means that if the receiver fails to correctly decode data, the receiver transmits information (negative acknowledgment, NACK) to the transmitter, notifying the receiver of the decoding failure, allowing the transmitter to retransmit the data at the physical layer. The receiver combines the retransmitted data with previously failed decoding data to improve data reception performance. Furthermore, if the receiver correctly decodes the data, the receiver can transmit information (acknowledgement, ACK) to the transmitter, notifying the transmitter of the successful decoding, allowing the transmitter to transmit new data.

[0161] The present disclosure below describes a method and device for transmitting HARQ-ACK feedback for downlink data transmission. Specifically, a method for configuring HARQ-ACK feedback bits when a terminal wishes to transmit multiple HARQ-ACKs within a single slot in the uplink is described.

[0162] In an NR system, a base station can configure one component carrier (CC) or multiple CCs for downlink transmission to a terminal. In addition, downlink transmission and uplink transmission slots and symbols can be configured in each CC. Meanwhile, when downlink data, PDSCH, is scheduled, at least one of slot timing information to which the PDSCH is mapped, information on the start symbol position to which the PDSCH is mapped within the slot, and information on the number of symbols to which the PDSCH is mapped can be transmitted in a specific bit field of DCI. For example, when DCI is transmitted in slot n and a PDSCH is scheduled, if K0, which is the slot timing information to which the PDSCH is transmitted, indicates 0, the start symbol position is 0, and the symbol length is 7, the PDSCH is mapped to and transmitted from symbol 0 of slot n to 7. Meanwhile, when the downlink data signal, PDSCH, is transmitted, and HARQ-ACK feedback is transmitted from the terminal to the base station after slot K1. K1 information, which is timing information for transmitting HARQ-ACK, is transmitted in DCI, and a set of candidate K1 values ​​that are possible through upper signaling is transmitted, and one of them can be determined in DCI.

[0163] When a semi-static HARQ-ACK codebook is configured for a terminal, the terminal can determine the feedback bits (or HARQ-ACK codebook size) to be transmitted based on a table including K0, which is slot information to which the PDSCH is mapped, start symbol information, number of symbols or length information, and candidate values ​​of K1, which is HARQ-ACK feedback timing information for the PDSCH. The table including slot information to which the PDSCH is mapped, start symbol information, number of symbols or length information can follow a default value, or the base station can also configure it for the terminal.

[0164] When a terminal is configured with a dynamic HARQ-ACK codebook, the terminal can determine the HARQ-ACK feedback bits (or HARQ-ACK codebook size) to be transmitted by the terminal based on the DAI (downlink assignment indicator) information included in the DCI in the slot in which HARQ-ACK information is transmitted based on the K0 value, which is slot information to which the PDSCH is mapped, and the K1 value, which is HARQ-ACK feedback timing information for the PDSCH.

[0165] Figure 8 is a diagram illustrating an example of a method for setting a semi-static HARQ-ACK codebook in an NR system.

[0166] In a situation where the number of HARQ-ACK PUCCHs that a UE can transmit in a slot is limited to one, when the UE receives a higher layer signal that configures a semi-static HARQ-ACK codebook, the UE may report HARQ-ACK information for PDSCH reception or SPS PDSCH release in the HARQ-ACK codebook in a slot indicated by the value of the PDSCH-to-HARQ_feedback timing indicator field included in DCI format 1_0 or DCI format 1_1. The UE may report the HARQ-ACK information bit value as NACK in the HARQ-ACK codebook in a slot that is not indicated by the PDSCH-to-HARQ_feedback timing indicator field in DCI format 1_0 or DCI format 1_1. If the UE receives M for candidate PDSCH reception, the UE may report the HARQ-ACK information bit value as NACK in the HARQ-ACK codebook in a slot that is not indicated by the PDSCH-to-HARQ_feedback timing indicator field included in DCI format 1_0 or DCI format 1_1. A,cIn cases where only HARQ-ACK information for one SPS PDSCH release or one PDSCH reception is reported, and the reporting is scheduled by DCI format 1_0 including information that the counter DAI field in the Pcell is set to 1, the UE can determine one HARQ-ACK codebook for the corresponding SPS PDSCH release or the corresponding PDSCH reception.

[0167] Other than that, the HARQ-ACK codebook determination method can be followed according to the following method.

[0168] The set of candidate cases for PDSCH reception in serving cell c is M A,c Then, M is generated in the following pseudo-code 1 steps A,c can be obtained.

[0169] [Begin pseudo-code 1]

[0170] - Step 1: Set j to 0, M A,c Initialize to an empty set. Initialize k, the HARQ-ACK transmission timing index, to 0.

[0171] - Step 2: Set R as a set of rows in a table containing slot information, start symbol information, number of symbols, or length information to which the PDSCH is mapped. If the PDSCH-capable mapping symbol indicated by each value of R is set to a UL symbol according to the DL and UL settings set above, delete the corresponding row from R.

[0172] - Step 3-1: If the terminal can receive one unicast PDSCH in one slot, and R is not an empty set, then the set M A,c Add 1 to .

[0173] - Step 3-2: If the terminal can receive more than one unicast PDSCH in one slot, count the number of PDSCHs that can be allocated to different symbols in the calculated R and multiply that number by M.A,c Add to.

[0174] - Step 4: Increase k by 1 and start again from step 2.

[0175] [End of pseudo-code 1]

[0176] Referring to FIG. 8, the pseudo-code 1 described above can be explained. In order to perform HARQ-ACK PUCCH transmission in slot#k(8-08), the UE can consider all slot candidates for which PDSCH-to-HARQ-ACK timing can be indicated by slot#k(8-08). In FIG. 8, it is assumed that HARQ-ACK transmission is possible in slot#k(8-08) by a PDSCH-to-HARQ-ACK timing combination that is possible only for PDSCHs scheduled in slot#n(8-02), slot#n+1(8-04), and slot#n+2(8-06). In addition, the maximum number of schedulable PDSCHs for each slot can be derived by considering the time-domain resource configuration information of the PDSCHs that can be scheduled in slots 8-02, 8-04, and 8-06, and the information indicating whether the symbol in the slot is a downlink or an uplink. For example, if two PDSCHs can be scheduled at maximum in slot 8-02, three PDSCHs can be scheduled at maximum in slot 8-04, and two PDSCHs can be scheduled at maximum in slot 8-06, the maximum number of PDSCHs included in the HARQ-ACK codebook transmitted in slot 8-08 is seven. This is called the cardinality of the HARQ-ACK codebook.

[0177] FIG. 9 is a diagram illustrating an example of a method for setting a dynamic HARQ-ACK codebook in an NR system.

[0178] The terminal can transmit HARQ-ACK information transmitted within a PUCCH in slot n based on the PDSCH-to-HARQ_feedback timing value for PUCCH transmission of HARQ-ACK information for PDSCH reception or SPS PDSCH release and K0, which is transmission slot location information of PDSCH scheduled in DCI format 1_0 or 1_1.

[0179] Specifically, for the HARQ-ACK information transmission described above, the terminal can determine the PDSCH-to-HARQ_feedback timing based on the DAI included in the DCI indicating the PDSCH or SPS PDSCH release and the HARQ-ACK codebook of the PUCCH transmitted in the slot determined by K0.

[0180] The above DAI is composed of a counter DAI and a total DAI. The counter DAI is information indicating the position of HARQ-ACK information corresponding to a PDSCH scheduled in DCI format 1_0 or DCI format 1_1 within the HARQ-ACK codebook. Specifically, the value of the counter DAI within DCI format 1_0 or 1_1 indicates the accumulated value of PDSCH reception or SPS PDSCH release scheduled by DCI format 1_0 or DCI format 1_1 in a specific cell c. The above-described accumulated value is set based on the PDCCH monitoring occasion and serving cell where the scheduled DCI exists.

[0181] Total DAI is a value that indicates the size of the HARQ-ACK codebook. Specifically, the total DAI value represents the total number of previously scheduled PDSCH or SPS PDSCH releases, including the time at which the DCI was scheduled (PDCCH monitoring occasion). Additionally, total DAI is a parameter used in CA situations when HARQ-ACK information on serving cell c also includes HARQ-ACK information for PDSCHs scheduled in other cells, including serving cell c. In other words, the total DAI parameter does not exist in a system that operates with a single cell.

[0182] FIG. 9 is a diagram illustrating an example of the operation of a terminal related to the DAI when a dynamic HARQ-ACK codebook is used. In FIG. 9, when a terminal is configured with two carriers (c), when transmitting a HARQ-ACK codebook selected based on DAI on the nth slot of carrier 0 (9-02) on PUCCH (9-20), the changes in the values ​​of the counter DAI (C-DAI) and the total DAI (T-DAI) indicated by the DCI searched for each PDCCH monitoring occasion set for each carrier are illustrated. First, in the DCI searched at m=0 (9-06), C-DAI and T-DAI each indicate a value of 1 (9-12). In the DCI searched at m=1 (9-08), C-DAI and T-DAI each indicate a value of 2 (9-14). In the DCI probed on carrier 0 (c=0, 9-02) of m=2(9-10), the C-DAI indicates a value of 3 (9-16). In the DCI probed on carrier 1 (c=1, 9-04) of m=2(9-10), the C-DAI indicates a value of 4 (9-18). In this case, if carriers 0 and 1 are scheduled in the same monitoring occasion, both T-DAIs are indicated as 4.

[0183] In FIGS. 8 and 9, the HARQ-ACK codebook determination can operate under the assumption that only one PUCCH containing HARQ-ACK information is transmitted within a slot. As an example of how one PUCCH transmission resource is determined within a slot, when PDSCHs scheduled in different DCIs are multiplexed and transmitted as one HARQ-ACK codebook within the same slot, the PUCCH resource selected for HARQ-ACK transmission can be determined as the PUCCH resource indicated by the PUCCH resource field indicated in the DCI that last scheduled the PDSCH. That is, the PUCCH resource indicated by the PUCCH resource field indicated in the DCI scheduled before the DCI is ignored.

[0184] Below, we describe the Network-controlled repeater (NCR).

[0185] Coverage is a critical factor in wireless communication systems. While 5G systems are currently commercialized, and millimeter wave technology is also included in the commercialization process, its limited coverage limits its practical use. Many operators are exploring ways to provide stable coverage while also providing services economically.

[0186] Integrated Access and Backhaul (IAB), a technology designed to find a more economical way to improve stable coverage in wireless communication systems, was studied across 3GPP Releases 16 and 17. IAB acts as a relay, eliminating the need for a wired backhaul network, and can relay data between base stations and terminals. While IAB offers similar performance to base stations, its use carries the disadvantage of increasing network costs.

[0187] Another technology that can be considered for improving stable coverage in wireless communication systems is the existing RF repeater. An RF repeater is the most basic unit of a repeater, amplifying and transmitting signals coming from a communication device. Because RF repeaters simply amplify and transmit signals, their use has the advantage of reducing network costs. However, they have the disadvantage of not being able to actively respond to various situations that may occur in the network. For example, RF repeaters typically use omni-directional antennas rather than directional antennas, making beamforming gain impossible. Furthermore, even when no terminals are connected to an RF repeater, it amplifies noise and transmits the signal, which can cause interference.

[0188] The aforementioned IAB and RF repeaters exhibit distinct advantages and disadvantages, as they are skewed toward either performance or cost. Realistically, increasing coverage in wireless communication systems requires consideration of both performance and cost. Therefore, the need for new terminals or amplifiers that address both performance and cost is emerging.

[0189] Standardization is underway for NCR, which improves coverage by enabling beamforming technology using adaptive antennas in RF repeaters while maintaining the amplification and transmission operations of RF repeaters. For an NCR to transmit signals to terminals within a cell using adaptive antennas, it must be able to receive control signals from the base station. Therefore, the NCR must be able to detect and decode the base station's control signals and can be structured to transmit and receive control signals similar to a terminal. The NCR can fundamentally amplify signals transmitted from the base station and transmit them to the terminal, and amplify signals transmitted from the terminal and transmit them back to the base station. In other words, the NCR does not detect or decode the signals or channels transmitted between the base station and the terminal; it merely amplifies and transmits the signals. Therefore, the terminal cannot detect the involvement of the NCR in communication between the base station and the terminal. In other words, the terminal cannot distinguish between the base station and the NCR, and the NCR can appear to be a base station. Because the terminal requires no additional information or operation from the NCR, NCR can support any terminal.

[0190] As previously described, from the base station's perspective, an NCR can appear as a typical terminal. When an NCR is first installed on a network, it can perform an initial connection to the base station like a typical terminal and announce its identity to the base station. After the base station identifies the NCR and a higher-layer connection (e.g., an RRC connection) is established between the base station and the terminal, the NCR can receive the settings necessary for amplification and transmission operations from the base station. For control purposes, the base station needs to know whether the terminal is connected directly to the base station or through the NCR. Determining whether the terminal served by the base station is within or outside the NCR's coverage area can be determined through various implementations.

[0191] While the base station can determine which terminal is communicating through which NCR, the NCR cannot. The NCR can amplify and transmit signals to terminals as controlled by the base station, regardless of whether the terminal is within its coverage area. For the base station to control the NCR, a dynamic control signal may be required.

[0192] FIG. 10 is a diagram illustrating an example of a transmission and reception operation of an NCR when the NCR relays between a base station and a terminal according to an embodiment of the present disclosure.

[0193] Referring to FIG. 10, an operation of NCR (1000) relaying communication (e.g., downlink, uplink) between a base station and a terminal is illustrated. NCR (1000) includes an NCR-MT (network-controlled repeater-mobile termination, 1001) capable of transmitting and receiving control signaling of the base station, and an NCR-Fwd (network-controlled repeater-forwarding, 1002) capable of amplifying and transmitting downlink signals or amplifying and transmitting uplink signals according to the control signaling of the base station. NCR-MT (1001) can receive control signaling from the base station through a control link (control link, C-link, 1003) and transmit feedback information to the base station. That is, from the base station's perspective, NCR-MT (1001) appears as a general terminal, and the base station can perform communication with NCR-MT (1001) accordingly. The base station can control the NCR-Fwd (1002) by transmitting control signaling to the NCR-MT (1001).

[0194] NCR-Fwd (1002) can basically process RF signals and / or physical layer signals, and can perform an operation of amplifying a downlink signal received from a base station and transmitting it to a terminal. NCR-Fwd (1002) can perform an operation of receiving a signal from a base station through a backhaul link (1004) in the downlink and then transmitting it to a terminal through an access link (1005). In the example of Fig. 10, the backhaul link (1004) and the C-link (1003) are illustrated as separate links, but the backhaul link (1004) and the C-link (1003) may not necessarily be physically separate links.

[0195] NCR (1001) can detect / detect DCI set to control the operation of NCR (1001) from the base station while performing signal amplification and transmission, through C-link (1003). In the case of uplink, NCR (1001) can receive an uplink signal transmitted by a terminal through an access link (1005), amplify the uplink signal, and transmit it to the base station through a backhaul link (1004). At this time, NCR (1001) can transmit uplink feedback or signal for DCI or upper layer signaling received from the base station to the base station. The backhaul link (1004) can be a wired link or a wireless link. In the embodiments of the present disclosure below, NCR can have a configuration as in the example of FIG. 10.

[0196] NCR can perform two operations on the backhaul link beam. The first operation is the default operation. The backhaul link beam of NCR can correspond to the beam with the smallest CORESET ID in the downlink, and the beam with the smallest PUCCH ID in the uplink. In this case, when the NCR-MT receives SSB, CSI-RS, PDCCH, PDSCH on the C-link, or transmits PRACH, PUCCH, PUSCH, or SRS (sounding reference signal), the C-link beam is applied to the backhaul link symbols that overlap with the corresponding channels and / or signals. If the Unified TCI state is configured, the indicated Unified TCI state is applied to the backhaul link beam.

[0197] In the second operation, when the NCR transmits a capability report to the base station that it can receive backhaul link instructions with MAC-CE, the base station can indicate the beam of the backhaul link with the MAC-CE. The MAC-CE contains the TCI state ID or SRI. When the NCR is indicated the backhaul link beam with the MAC-CE, the indicated beam is applied until the beam is updated with an additional MAC-CE. At this time, when the NCR-MT receives SSB, CSI-RS, PDCCH, PDSCH, or transmits PRACH, PUCCH, PUSCH, or SRS on the C-link, the beam of the C-link is applied to the backhaul link symbols that overlap with the corresponding channels and / or signals.

[0198] NCR can receive instructions for access link beams via C-link. NCR can receive periodic, semi-persistent, and aperiodic instructions. Access link beam instructions are described in Figures 11a, 11b, and 11c below.

[0199] FIG. 11A is a diagram illustrating an example of an NCR receiving a beam instruction for a periodic access link from a base station. Referring to FIG. 11A, the NCR can be configured with one or more forwarding lists (11-01) through upper layer signaling (11-00). Each forwarding list includes one or more forwarding resources (11-02). Each forwarding resource includes one access link beam index and one time resource. Here, the access link beam index is an index corresponding to a physical beam that can be applied in the uplink and downlink of the NCR's access link. In addition, the time resource includes time information (e.g., slot offset, symbol offset, and symbol duration) at which the access link beam is to be applied. In addition to the forwarding resource, the forwarding list can include a period and an SCS. If the NCR receives the above upper layer signaling, it can operate as in 11-20. 11-20 illustrates an example of List0. The NCR can refer to List0, apply access link beam index 0 according to the subcarrier interval given in the 11-22 time domain, and perform amplification and forwarding operations. In the same way, the NCR can apply access link beam indices 1 and 2 in 11-23 and 11-24 to perform amplification and forwarding operations. The forwarding resources in List0 can be continuously repeated according to the cycle (11-21).

[0200] Figure 11b is a diagram illustrating an example of an NCR receiving a beam instruction for a semi-persistent access link from a base station. The difference between the periodic access link beam instruction of Figure 11a and the beam instruction for a semi-persistent access link is that the periodic access link beam instruction is activated immediately when set by upper layer signaling, whereas the semi-persistent access link beam instruction requires that the corresponding forwarding resource be activated by MAC-CE. The NCR can receive a forwarding list and forwarding resources to be applied to the semi-persistent access link beam index by upper layer signaling (11-30). The relationship between the forwarding list and the forwarding resources is the same as the periodic instruction of Figure 11a. When the NCR is instructed to activate List0 from the base station with MAC-CE (11-70), the NCR can refer to List0 indicated by MAC-CE, such as 11-50, apply access link beam index 0 according to the subcarrier interval given in the 11-52 time domain, and perform amplification and forwarding operations. In the same way, the NCR can apply access link beam indices 1 and 2 in 11-53 and 11-54 to perform amplification and forwarding operations. The forwarding resources of List0 can be continuously repeated according to the cycle (11-51). If the NCR receives a deactivation instruction of List0 with MAC-CE (11-70), the cycle is no longer repeated.

[0201] FIG. 11C is a diagram illustrating an example in which an NCR receives a beam indication for an aperiodic access link from a base station. The aperiodic access link beam indication of FIG. 11C differs from the periodic / semi-persistent access link beam indications of FIGS. 11A and 11B in that the NCR dynamically receives the access link beam indication through DCI, and the indication does not have a corresponding period. The NCR can set the number of access link beams applicable to the aperiodic access link beam indication, the time resource list, and the number of beam index and time index fields included in the DCI through upper layer signaling (11-80). Although FIG. 11C illustrates an example in which the DCI includes three beam index fields and three time index fields, the present invention is not limited to such an example.

[0202] If the NCR detects a DCI scrambled with an NCR-specific RNTI (e.g., DCI format 2_8, 11-85), the NCR can refer to the beam index field and time index field indicated by the DCI. The beam index field indicates the access link beam index, and the time index field indicates the entry or resource ID of the time resource list configured in the upper layer signaling (11-80). The beam index field and the time index field always have the same number of fields and have a 1:1 mapping. Through the combination of the beam index field and the time index field, the NCR can receive an access link beam indication, such as 11-20, by the DCI (11-85). Specifically, as in 11-90, the NCR can apply the access link beam index 0 as indicated by the DCI (11-85) according to the given subcarrier interval in the 11-92 time domain, and perform an amplification and forwarding operation. In the same way, NCR can perform amplification and forwarding operations by applying access link beam indices 1 and 2 to 11-93 and 11-94. This operation is not repeated.

[0203] It may not be explicitly communicated to the NCR whether the access link beam indicated applies to the uplink or downlink. In this case, the NCR may determine the direction of the access link beam according to the uplink or downlink indicated by the higher layer signaling tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated, which may be specified in the 3GPP standard TS 38.331. If a flexible symbol other than the uplink or downlink is indicated, the NCR may not perform the amplification and forwarding operation.

[0204] <Embodiment 1: Passband Setting Method>

[0205] The NCR receives a control signal through the NCR-MT and performs amplification and transmission operations. At this time, since the control signal is transmitted through the PDSCH or PDCCH in the same way as the existing terminal, it is more advantageous from the perspective of hardware complexity for the band of the NCR-MT and the band performing the amplification and transmission operations to be the same. Therefore, the conventional NCR expects the band of the NCR-MT and the passband to overlap. The passband is a frequency band where the amplification and transmission operations are performed, and can be a frequency band where the backhaul link and the access link exist, and is assumed to be continuous. In addition, the conventional NCR assumes that the band of the NCR-MT and the passband always operate in the same band.

[0206] FIG. 12 is a diagram illustrating an example of an NCR-MT band and passband according to an embodiment of the present disclosure. Referring to FIG. 12, it can be seen that a conventional NCR expects the same operation as 12-00. In 12-00, an example is shown where the NCR-MT band (12-03) and the passband (12-01) overlap and are included in the same frequency band (12-04). Since it is assumed that the NCR-MT band (12-03) and the passband (12-01) always overlap and use the same band in terms of frequency band, a conventional NCR can only receive time information (e.g., time resource) of the access link beam described in at least FIGS. 11a, b, and c, and frequency information may not be included.

[0207] If a conventional NCR operates as in 12-10, the NCR will always apply beams or perform amplification and forwarding operations simultaneously in the 12-05 and 12-06 passbands. If the NCR can operate separately in each passband by distinguishing between 12-05 and 12-06, the power consumption of the NCR can be reduced and interference can be reduced. For example, if the NCR performs forwarding operations in the multi-GHz band, but the served terminal only needs a few tens of MHz of bandwidth, always forwarding signals across the entire band would result in power waste and interference. Operation that only forwards the required frequency band can be advantageous for the NCR.

[0208] Typically, NCRs can only operate within the same band, with the NCR-MT band and passband band. If the NCR operates in a higher frequency band, such as the FR2 band, the reliability of control signal reception may deteriorate due to high path loss and signal linearity. For example, consider a case where the NCR-MT band and passband are located in Band#A and Band#B, respectively, such as NCR 12-20. Separating the NCR-MT band and passband into different bands can improve reliability and performance. For example, if the NCR-MT receives control signals from the base station in the FR1 band and the passband is located in the FR2 or other bands that support wideband, the reliability of control signal reception can increase. Additionally, if NCR can perform signal transmission operation simultaneously or through time division through passbands located in different bands Band#A and Band#B, such as 12-30, NCR can increase the reliability of signals transmitted and received by terminals and further increase performance.

[0209] In conclusion, if NCR can support the operation of selectively applying multiple passbands or can support inter-band operation between the band and passband of NCR-MT, power consumption reduction, interference reduction, reliability increase, and performance improvement can be expected. To support the above operations, the operation of NCR recognizing the passband ID by setting the passband is required. In addition, for selective passband and inter-band operation, additional operation definitions will be required for the access link beam and backhaul link beam. The following describes how NCR receives the passband configuration.

[0210] Because conventional NCR configurations do not include passband settings, selective amplification and transmission operations cannot be performed across frequency bands under base station control. To control the NCR passband under base station control, the base station must proactively acquire NCR passband information. The base station can acquire NCR passband information in the following ways:

[0211] Method 1 involves the NCR transmitting a capability report containing passband information to the base station, which then configures the passband. Once a connection is established between the base station and the NCR, the base station establishes radio resources for the NCR by requesting capability information from the NCR. For the network to manage the NCR, continuous terminal capability reporting is required. The NCR's terminal capability reporting procedure can be identical to that of existing terminals.

[0212] FIG. 13 is a diagram illustrating an example of a capability report of an NCR including passband information according to an embodiment of the present disclosure. Referring to FIG. 13, an operation of an NCR performing a capability report (13-00) is illustrated. The NCR may transmit information about each passband as a bundle in order to report information about one or more passbands. For example, the NCR may report an information bundle (13-02) about a passband by indexing it (13-01). If there is no index, it can be inferred that the index is assigned in the order of the information bundles. The information included in the information bundle (13-02) included in the capability report (13-00) may include at least one of the following:

[0213] - Band number

[0214] - CC (component carrier)

[0215] - Start CRB (common resource block)

[0216] - CRB size

[0217] The above information bundle will allow the base station to know which passband of the NCR is located in which frequency domain. In addition to the above information, the NCR can report intra-band or inter-band NCR capabilities. Intra-band capability may mean that the band and passband of the NCR-MT are located in the same band. An NCR reporting intra-band capability can expect that the band and passband of the NCR-MT will always be located in the same band. On the other hand, inter-band capability may mean that the band and passband of the NCR-MT can be located in different bands. The network can configure the band and passband of the NCR-MT of an NCR reporting inter-band capability to be in different bands. Based on the capability report of the NCR, the network can decide whether to configure the passband to be located in the same band as the NCR-MT band or in a different band. In the above, the band may refer to a frequency band defined in a standard such as TS 38.101, or may refer to a frequency range (FR). As an example, FR1 may be understood as a frequency band of 410 MHz to 7.125 GHz, FR2 as a frequency band of 24.25 GHz to 71.0 GHz, FR3 as a frequency band of 7.125 GHz to 24.25 GHz, and FR4 as a frequency band of 71.0 GHz to 114.25 GHz, but obvious modifications are also possible. In addition, the terminal capability report may include information related to an access link beam that can be supported by the NCR and information related to an access link beam that can be supported in each passband.

[0218] - After the NCR reports its capability (13-00), the base station can perform passband configuration (13-10). Passband configuration information can be transmitted from the base station to the NCR via upper layer signaling (e.g., RRC). The base station's passband configuration can include at least one of the following information:

[0219] - Passband ID: The passband ID can be viewed as a unique identifier for each passband. If a mapping index is set, the passband ID can indicate multiple, non-contiguous frequency bands. In this case, the passband ID can mean the identifier of a set containing multiple passbands.

[0220] - Mapping index: The mapping index can be used when one passband ID points to multiple frequency bands. For example, passband ID0 set to 13-10 corresponds to passband index 0 of 13-01 reported by the terminal, and passband ID2 can correspond to both passband indices 0 and 1. If the mapping index is not set, it can be expected that the passband IDs are mapped one-to-one in order with the information bundles included in the capability report. That is, passband ID0 can correspond to passband index 0, and passband ID1 can correspond to passband index 1.

[0221] The NCR will be able to know the minimum passband ID and corresponding frequency band information from the above passband configuration. If the NCR does not receive any configuration for the passband, it can be expected that the NCR will always apply the access link beam or perform amplification and forwarding operations for all passbands.

[0222] Method 2 is that information about the NCR's passband is disclosed according to the manufacturers' specifications, and each operator configures the passband through internal implementation (e.g., an operation and maintenance (OAM) server). The passband can be configured for the base station and the NCR according to the operator's internal procedures. In this case, the base station can additionally configure the passband to be actually used by sending upper layer signaling to the NCR. The above configuration is expected to include at least a passband ID. According to Method 2, the use of one or more passbands can be performed internally without standard support, but the difference in implementation between operators may lead to the problem of having to support a specialized NCR for each operator.

[0223] <Second Embodiment: Frequency Selective Access Link Beam Indication Method>

[0224] When an access link beam indication is given, the NCR can expect that the indication includes at least an access link beam index and a time resource. Meanwhile, in order for the base station to operate the NCR frequency selectively, it must indicate which passband will be activated in which time resource. For example, the base station can use the above-described passband ID to indicate to the NCR the frequency resource to be activated. The following description describes a method for indicating passband activation when the NCR receives an access link beam indication from the base station. The method can be as follows.

[0225] Method 1 is that the NCR receives the relationship between the passband and the access link beam index from the base station through upper layer signaling (e.g., RRC). Method 1 establishes the link between the access link beam index and the passband without additional configuration for the physical layer, so that when the corresponding access link beam is indicated, the corresponding passband is activated.

[0226] FIG. 14 is a diagram illustrating an example of setting a passband and an access link beam index according to an embodiment of the present disclosure. Referring to FIG. 14, Method 1-1 (14-00) and Method 1-2 (14-10) may be referenced.

[0227] Method 1-1 (14-00) is a method in which a passband ID is set as a sub-category of each access link beam index. The NCR can be configured with an NCR-BeamConfig information element that sets the relationship between the access link beam index and the passband ID. The above terms are used arbitrarily for convenience and can be replaced with other terms having the same meaning. Up to N access link beam indices can be configured by NCR-BeamConfig. And for each beam index, information about at least one passband ID corresponding to each beam index can be configured. If the NCR receives one of periodic / quasi-persistent / aperiodic access link beam instructions, the NCR can perform an amplification and transmission operation in the frequency band corresponding to the passband ID by referring to the passband ID set in the sub-category by referring to the corresponding beam index of NCR-BeamConfig. For example, if the NCR is instructed to have beam index 0 by at least one of the methods of FIGS. 11a to 11c, the NCR can perform amplification and transmission operations in passband IDs 0 and 1 corresponding to the beam index 0.

[0228] Method 1-2 (14-10) is a method in which an access link beam index is set as a sub-setting of a passband ID setting. This is a method in which an access link beam index is included in sub-information of a system setting including frequency and / or time resources. The NCR can receive PassbandConfig, which is an information element of a passband ID that can be activated. PassbandConfig can correspond to the passband setting (13-10) described above. The above terms are used arbitrarily for convenience and can be replaced with other terms having the same meaning. PassbandConfig can include multiple passband IDs, and the sub-information of each passband ID can include at least one access link beam index. In addition, the access link beam index can be included in duplicates in different passband IDs. For example, beam index 0 can be included in the sub-information of both passband IDs 0 and 1. At this time, if the NCR is instructed to have beam index 0 by at least one of the methods of FIGS. 11a to 11c, the NCR can perform amplification and transmission operations in passband IDs 0 and 1. Alternatively, if the NCR is instructed to have beam index 2 by at least one of the methods of FIGS. 11a to 11c, the NCR can perform amplification and transmission operations in passband ID 1.

[0229] The above-described methods 1-1 and 1-2 are methods for setting the relationship between the beam index and the passband in the upper layer regardless of the periodic / semi-persistent / aperiodic access link beam instructions. According to methods 1-1 and 1-2, the passband can be controlled consistently for all access link beam instructions, so it may be easy to apply from the network's perspective. However, in order to change the relationship between the passband and the access link beam, a reset must be performed by upper layer signaling, which takes a long time to process, so the access link beam cannot be dynamically changed for the required channel and / or signal. Therefore, a method may be needed to define the passband to be activated for each periodic / semi-persistent / aperiodic access link beam applicable to each channel and / or signal.

[0230] Method 2 is a method that indicates which passbands will be activated for each periodic / semi-persistent / aperiodic access link beam. Method 2 can be divided into periodic / semi-persistent / aperiodic.

[0231] - Periodic Method 2-1: When a periodic access link beam is used, the NCR may be configured with one or more forwarding lists through upper layer signaling. Each forwarding list may include one or more forwarding resources. And each forwarding resource may include one access link beam index, one time resource, and one or more passband IDs. If there is a forwarding resource configuration that does not include a passband ID, the forwarding resource may be considered to activate passbands according to all passband IDs configured in the upper layer. If a specific passband ID is not included in any forwarding resource in the forwarding list, the NCR may expect that the specific passband ID is included in the forwarding list at least once. That is, a passband ID corresponding to a forwarding list, rather than a specific forwarding resource, may be included in the forwarding list configuration, in which case the included passband ID may be considered to correspond to all forwarding resources included in the forwarding list configuration.

[0232] - Semi-persistent method 2-2: The NCR can be configured with one or more forwarding lists to be applied to the semi-persistent access link beam indexes by upper layer signaling. Each forwarding list can include one or more forwarding resources. And each forwarding resource can include one access link beam index, one time resource, and one or more passband IDs. If there is a forwarding resource configuration that does not include a passband ID, the forwarding resource can be considered to activate passbands according to all passband IDs configured in the upper layer. If a specific passband ID is not included in any forwarding resource in the forwarding list, the NCR can expect that the specific passband ID is included in at least one forwarding list. That is, a passband ID corresponding to a forwarding list, not a specific forwarding resource, can be included in the forwarding list configuration, in which case the included passband ID can be considered to correspond to all forwarding resources included in the forwarding list configuration.

[0233] The NCR may be instructed to activate or deactivate one of the forwarding lists by the MAC-CE. Typically, a semi-persistent access link beam is instructed for the purpose of amplifying and forwarding the semi-persistent channel and / or signal of the served terminal. Therefore, the passband ID may need to be updated depending on the situation. If a passband ID exists for each forwarding resource, the MAC-CE may be instructed to map one or more forwarding resource entries or IDs to the passband ID one-to-one. The forwarding resource indicated by the MAC CE may be a forwarding resource included in one or more forwarding lists. If no passband ID is set for any forwarding resource and a passband ID is set for only a forwarding list, the MAC-CE may include one or more passband IDs and the number of passbands indicated (for a specific forwarding list). The NCR may update the activated passband based on the passband information included in the MAC-CE to perform the amplification and forwarding operation. If no passband information exists in MAC-CE, NCR may activate the passband information set by upper layer signaling.

[0234] - Aperiodic Method 2-3: Aperiodic methods can be divided into two types. The first, Method 2-3-1, is a method in which the NCR receives passband information set by upper-layer signaling and updates it with DCI as needed. The second, Method 2-3-2, is a method in which passband information can only be obtained from DCI. The two methods are as follows.

[0235] Method 2-3-1: NCR can be configured with the number of access link beams applicable to aperiodic access link beam indication through upper layer signaling, a time resource list, and the number of beam index and time index fields included in DCI. The time resource list configured in the upper layer signaling includes at least one time resource. The time resource can include a slot offset, a symbol offset, a symbol length, and at least one passband ID.

[0236] If the NCR detects a DCI scrambled with an NCR-specific RNTI (for example, DCI format 2_8), the NCR can refer to the time index field. The time index field contains an entry or ID of the time resource list. The NCR can check the passband ID corresponding to the time resource indicated in the time resource field of the detected DCI and perform amplification and forwarding operations in the corresponding frequency band indicated by the passband ID. The aperiodic access link beam indication is to respond to the dynamic traffic of the serving terminal, and if necessary, the NCR may need to use a passband other than the passband configured by the upper layer signaling. In this case, the NCR can receive a setting that the DCI includes a passband ID through the upper layer signaling and perform amplification and forwarding operations in the passband indicated by the passband ID. That is, if the passband update by the DCI is configured by the upper layer signaling, the NCR can prioritize at least one passband ID included in the DCI. The passband ID included in the DCI may be applied to all time resources indicated by the DCI.

[0237] Method 2-3-2: If the NCR detects a DCI scrambled with an NCR-specific RNTI (e.g., DCI format 2_8), the NCR may detect at least one passband ID field included in the DCI. The number of passband ID fields included in the DCI may be configured by upper layer signaling. The passband indicated by the DCI may be applied equally to all indicated time resources, or alternatively, the number of passband ID fields may always be equal to the number of time resource fields, and the passband ID field and the time resource field may be mapped one-to-one. In this case, different passbands may be applied to each time resource. For example, if DCI includes passband ID field 1 and passband ID field 2, time resource field 1 and time resource field 2, the passband indicated by passband ID field 1 may be activated in the time resource indicated by time resource field 1, and the passband indicated by passband ID field 2 may be activated in the time resource indicated by time resource field 2. In this case, the passband ID field may indicate one or more passband IDs.

[0238] Methods 1 and 2 described above are both methods for performing passband activation associated with an access link beam index and indication. Another method is a method for indicating passband activation independently of the access link beam. Method 3, which is a method for indicating passband activation independently of the access link beam, is as follows.

[0239] FIG. 15 is a diagram illustrating an example of an independent passband indication according to an embodiment of the present disclosure. Referring to FIG. 15, an example of an operation in which an NCR activates a passband (15-01, 15-02) upon receiving an instruction via a MAC-CE or DCI (15-00). The MAC-CE or DCI may be different from a MAC-CE or DCI indicating an access link beam. The MAC-CE or DCI received by the NCR for passband activation may include at least one passband ID. When the NCR is instructed with a passband ID via a MAC-CE or DCI, the indicated passband may be activated after a given slot offset. For example, when the NCR receives a MAC-CE indicating passband activation from a base station, the offset may be based on the first slot after a PUCCH transmitting a HARQ-ACK for a PDSCH including the MAC-CE. When the NCR receives a DCI indicating passband activation, the slot of the PDCCH carrying the DCI can serve as the offset reference. Once activated, the passband indicated by MAC-CE or DCI can remain activated until further instructions are given.

[0240] Depending on the needs of the terminals served by the NCR, the NCR may need to switch its passbands. When the NCR receives a MAC-CE or DCI indicating multiple passbands, the passband indicated later in the time axis may have priority. For example, if the base station indicates passband 0 (15-01) at 15-00 and then indicates passband 1 (15-02) at 15-10, passband 1 will be activated. Similarly, if passbands 0 and 1 are indicated at 15-20, passbands 0 and 1 will be activated. It can be assumed that all configured passbands are activated before a MAC-CE or DCI is issued.

[0241] <Third Embodiment: Interband Backhaul Link Beam Operation Method>

[0242] As previously explained, if the band and passband of the NCR-MT are located in different bands, such as 12-20 or 12-30 in FIG. 12, and the NCR performs its operation, reliability can be improved and performance can be increased. For example, if the NCR-MT receives a control signal in the FR1 band and the passband is located in the FR2 or a band that supports wideband, the reliability of the control signal can be increased. More specifically, in band #A of 12-20, the NCR-MT receives the control signal required for amplification and transmission through PDCCH monitoring, and performs the amplification and transmission operation in band #B. For example, the base station can configure band #A as a PCell for the NCR-MT, band #B as an SCell, and then set the BWP of band #B as a dormant BWP. The NCR can perform channel measurement and beam management by receiving or transmitting signals such as SSB, CSI-RS, and SRS in band #A. However, since the dormant BWP is set in band #B, NCR-MT does not perform PDCCH monitoring, but measures downlink channels such as SSB or periodic CSI-RS, and the measurement results can be reported to the base station in the NCR-MT band of band #A.

[0243] When NCR operates in a band such as 12-20 or 12-30, access link beam direction can be achieved according to the passband configuration and frequency-selective access link beam direction method described above. On the other hand, backhaul link beam operation may be ambiguous. In the absence of NCR-MT traffic, the backhaul link beam of a typical NCR can be obtained by applying the QCL of the CORESET with the lowest ID or by applying the spatial filter of the PUCCH with the lowest ID. The above operation is possible under the assumption that the CORESET is configured in the same band or CC and that PUCCH can be transmitted.

[0244] However, if CORESET or PUCCH is not configured in the band where the backhaul link is located, such as band #B of 12-20 or 12-30, the operation of the NCR using the backhaul link beam may be ambiguous. Even if the NCR attempts to apply the beam of the CORESET or PUCCH configured in the adjacent band, the applicable beam may differ depending on the frequency band. Therefore, the backhaul link beam of the passband operating in the band without CORESET or PUCCH configuration needs to be defined according to a different operation from the conventional operation. The operation of the backhaul link beam in the band without CORESET or PUCCH configuration is as follows.

[0245] - Method 1: If a TCI state is set for a band for which CORESET is not set, the NCR can use the TCI state with the smallest ID among the TCI states activated by MAC-CE as the downlink beam of the backhaul link. The uplink beam of the backhaul link can be obtained by reusing the spatial filter used when receiving a signal according to the TCI state in the downlink for the uplink beam purpose. The above method assumes that the downlink channel is similar to the uplink channel (beam correspondence).

[0246] - Method 2: For bands where CORESET is not set, the NCR will perform continuous channel measurement and beam management operations. The NCR can expect to receive the beam of the SSB or CSI-RS with the best RSRP among the SS-RSRP or CSI-RSRP measured and reported for the band as the downlink beam of the backhaul link. The uplink beam of the backhaul link can be obtained by reusing the spatial filter used when receiving the SSB or CSI-RS for the uplink beam purpose. The method assumes that the downlink channel is similar to the uplink channel (beam correspondence). If the above assumption is not satisfied, the NCR can apply the spatial filter used for the most recently transmitted PRACH to the uplink beam of the backhaul link.

[0247] - Method 3: For bands where CORESET is not configured, the NCR can expect the base station to indicate the backhaul link beam with the MAC-CE. In other words, if the NCR is configured to perform interband operation, the NCR can expect to always receive backhaul link beam indications with the MAC-CE for bands where CORESET is not configured. In this case, the MAC-CE indicating the backhaul link beam may include the passband ID. The base station can also expect the NCR to report the capability of indicating the backhaul link beam with the MAC-CE when transmitting the capability report for interband operation. The NCR can receive the backhaul link beam of the bands where CORESET is not configured with the MAC-CE and perform the amplification and forwarding operation after the indicated beam is applied.

[0248] Additionally, information regarding whether NCR supports the above-mentioned backhaul link beam operation may be included in the terminal capability report and reported to the base station. This information may also be reported together with the interband NCR capability report.

[0249] It is possible for the methods for the first to third embodiments described above to be performed in combination with at least one method.

[0250] FIG. 16 is a flowchart illustrating an example of the operation of an NCR performing at least one embodiment of the present disclosure.

[0251] The NCR may transmit a terminal capability report to the base station (16-00). The terminal capability report may include at least one of passband information that the NCR can support, inter-band or / and intra-band NCR capabilities, access link beam-related information, or backhaul link beam support-related information, and the above-described contents may be referenced. In addition, the above-described step may be omitted. The NCR may receive at least one of passband configuration information, access link beam configuration information, or backhaul link beam configuration information from the base station (16-10). The configuration information may be based on the terminal capability report, and the details may follow the contents of the first to third embodiments described above.

[0252] After receiving the above-mentioned configuration information, the NCR can operate according to the above-mentioned configuration information (16-20). For example, the NCR can transmit and receive channels and / or signals with the terminal using the access link beam indicated in the passband activated according to the above-mentioned configuration information.

[0253] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0254] FIG. 17 is a flowchart illustrating an example of the operation of a base station performing at least one embodiment of the present disclosure.

[0255] The base station can receive a terminal capability report from the NCR (17-00). The terminal capability report can include at least one of passband information that the NCR can support, inter-band or / and intra-band NCR capabilities, access link beam-related information, or backhaul link beam support-related information, and the above-described contents can be referenced. In addition, the above-described step can be omitted. The base station can transmit at least one of passband configuration information, access link beam configuration information, or backhaul link beam configuration information to the NCR (17-10). The configuration information can be based on the terminal capability report, and the details can follow the contents of the first to third embodiments described above.

[0256] After receiving the above-mentioned configuration information, the NCR can operate according to the above-mentioned configuration information (17-20). For example, the base station can transmit control information to the NCR via the NCR-MT link and transmit a channel and / or signal to be transmitted to the terminal via the backhaul link.

[0257] The above flowchart illustrates exemplary methods that can be implemented according to the principles of the present disclosure, and various modifications may be made to the methods depicted in the flowcharts herein. For example, although depicted as a series of steps, various steps in each drawing may overlap, occur in parallel, occur in different orders, or occur multiple times. In other instances, steps may be omitted or replaced with other steps.

[0258] FIG. 18 is a block diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0259] Referring to FIG. 18, the terminal may include a terminal receiving unit (18-00), a terminal transmitting unit (18-10), and a terminal processing unit (control unit) (18-05).

[0260] For example, as described above, the NCR, which relays between a terminal and a base station, appears to the base station as a terminal, so in this case, the terminal in Fig. 18 may be an NCR. For example, the NCR may include a receiving unit, a transmitting unit, and a processing unit (control unit).

[0261] The terminal receiving unit (18-00) and the terminal transmitting unit (18-10) may be collectively referred to as a transceiver. Depending on the communication method of the terminal described above, the terminal receiving unit (18-00), the terminal transmitting unit (18-10), and the terminal processing unit (18-05) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components (e.g., memory, etc.) than the components described above. In addition, the terminal receiving unit (18-00), the terminal transmitting unit (18-10), and the terminal processing unit (18-05) may be implemented in the form of a single chip.

[0262] The terminal receiving unit (18-00) and the terminal transmitting unit (18-10) (or, transmitting and receiving unit) can transmit and receive signals with the base station. Here, the signals can include control information and data. To this end, the transmitting and receiving unit can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transmitting and receiving unit, and the components of the transmitting and receiving unit are not limited to the RF transmitter and the RF receiver.

[0263] In addition, the transceiver can receive a signal through a wireless channel and output it to the terminal processing unit (18-05), and transmit the signal output from the terminal processing unit (18-05) through the wireless channel.

[0264] Memory (not shown) can store programs and data necessary for the operation of the terminal. Furthermore, the memory can store control information or data included in signals acquired from the terminal. The memory may be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media.

[0265] The terminal processing unit (18-05) can control a series of processes so that the terminal can operate according to the embodiments of the present disclosure described above. The terminal processing unit (18-05) can be implemented as a control unit or one or more processors.

[0266] FIG. 19 is a block diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0267] Referring to FIG. 19, the base station may include a base station receiving unit (19-00), a base station transmitting unit (19-10), and a base station processing unit (control unit) (19-05).

[0268] For example, as described above, the NCR, which relays between a terminal and a base station, appears to be a base station from the terminal's perspective. Therefore, in this case, the base station of Fig. 21 may be an NCR. For example, the NCR may include a receiving unit, a transmitting unit, and a processing unit (control unit).

[0269] The base station receiving unit (19-00) and the base station transmitting unit (19-10) may be collectively referred to as a transceiver. Depending on the communication method of the base station described above, the base station receiving unit (19-00), the base station transmitting unit (19-10), and the base station processing unit (19-05) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components (e.g., memory, etc.) than the components described above. In addition, the base station receiving unit (19-00), the base station transmitting unit (19-10), and the base station processing unit (19-05) may be implemented in the form of a single chip.

[0270] The base station receiving unit (19-00) and the base station transmitting unit (19-10) (or, transmitting and receiving unit) can transmit and receive signals with the terminal. Here, the signals can include control information and data. To this end, the transmitting and receiving unit can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transmitting and receiving unit, and the components of the transmitting and receiving unit are not limited to the RF transmitter and the RF receiver.

[0271] In addition, the transceiver unit can receive a signal through a wireless channel and output it to the base station processing unit (19-05), and transmit the signal output from the base station processing unit (19-05) through the wireless channel.

[0272] Memory (not shown) can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data contained in signals acquired from the base station. The memory may be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media.

[0273] The base station processing unit (19-05) can control a series of processes so that the base station can operate according to the embodiments of the present disclosure described above. The base station processing unit (19-05) can be implemented as a control unit or one or more processors.

[0274] FIG. 20 is a block diagram illustrating the structure of an NCR in a wireless communication system according to an embodiment of the present disclosure.

[0275] Referring to FIG. 20, the NCR may include an NCR processing unit (control unit) (20-00) and an NCR transceiver unit (20-10). The NCR processing unit (20-00) and the NCR transceiver unit (20-10) of the NCR may operate according to the communication method of the NCR described above. Specifically, the NCR processing unit (20-00) and the NCR transceiver unit (20-10) may perform the operations of the NCR-MT and NCR-fwd described above. However, the components of the NCR are not limited to the examples described above. For example, the NCR may include more or fewer components (e.g., memory, etc.) than the components described above. In addition, the NCR processing unit (20-00) and the NCR transceiver unit (20-10) may be implemented in the form of a single chip.

[0276] The NCR transceiver (20-10) can transmit and receive signals between a base station and a terminal. Here, the signals can include control information and data. For example, the NCR transceiver (20-10) can receive control information and downlink signals for controlling the operation of the NCR from the base station, amplify and transmit an uplink signal of the terminal to the base station, and transmit feedback information and / or SRS regarding signaling of the base station. In addition, the NCR transceiver can receive an uplink signal from the terminal and amplify and transmit a downlink signal of the base station to the terminal. To this end, the NCR transceiver (20-10) can be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and frequency-converts a received signal. However, this is only one embodiment of the transceiver, and the components of the NCR transceiver (20-10) are not limited to the RF transmitter and the RF receiver.

[0277] Memory (not shown) can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data contained in signals acquired from the base station. The memory may be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media.

[0278] The NCR processing unit (20-00) can control a series of processes so that the NCR can operate according to the examples of the present disclosure described above. The NCR processing unit (20-00) can be implemented as a control unit or one or more processors.

[0279] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0280] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0281] Additionally, the method of the present disclosure may be implemented by combining some or all of the contents contained in each embodiment, as long as it does not harm the essence of the disclosure. For example, it goes without saying that some or all of one or more embodiments may be combined with some or all of one or more other embodiments.

[0282] Additionally, although not disclosed in the present disclosure, a method in which a separate table or information including at least one component included in the table proposed in the present disclosure is used is also possible.

[0283] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples presented to easily explain the technical content of the present disclosure and aid in understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art to which the present disclosure pertains that other modified examples based on the technical concept of the present disclosure are possible. Furthermore, the above-described embodiments may be combined and operated as needed.

Claims

1. A method for performing a network-controlled repeater (NCR) of a wireless communication system, A step of transmitting capability information about a passband that the NCR can support to a base station; and Comprising a step of receiving upper layer signaling including configuration information for the passband from the base station, The above passband is a band that includes the backhaul or / and access link of the NCR, A method characterized in that the above capability information includes at least one of a band number for one or more passbands, frequency band resource information, and inter-band capability information and / or intra-band capability information of the NCR.

2. In paragraph 1, A method characterized in that the above upper layer signaling includes information indicating an identifier of a passband set to the NCR and one or more frequency bands corresponding to the identifier.

3. In paragraph 2, The above upper layer signaling includes access link beam setup information, A method characterized in that the above access link beam setting information includes an index of one or more access link beams and an identifier of one or more passbands corresponding to each access link beam.

4. In paragraph 2, The above upper layer signaling includes access link beam setup information, A method characterized in that the above access link beam setting information includes an identifier of one or more passbands and an index of one or more access link beams corresponding to the identifier of each passband.

5. In a method performed by a base station of a wireless communication system, A step of receiving capability information about a passband that the NCR can support from a network-controlled repeater (NCR); and Comprising a step of transmitting upper layer signaling including configuration information for the passband to the NCR, The above passband is a band that includes the backhaul or / and access link of the NCR, A method characterized in that the above capability information includes at least one of a band number for one or more passbands, frequency band resource information, and inter-band capability information and / or intra-band capability information of the NCR.

6. In paragraph 5, A method characterized in that the above upper layer signaling includes information indicating an identifier of a passband set to the NCR and one or more frequency bands corresponding to the identifier.

7. In paragraph 6, The above upper layer signaling includes access link beam setup information, A method characterized in that the above access link beam setting information includes an index of one or more access link beams and an identifier of one or more passbands corresponding to each access link beam.

8. In paragraph 6, The above upper layer signaling includes access link beam setup information, A method characterized in that the above access link beam setting information includes an identifier of one or more passbands and an index of one or more access link beams corresponding to the identifier of each passband.

9. In the NCR (network-controlled repeater) of a wireless communication system, Transmitter and receiver; and Transmit capability information about the passband that the NCR can support to the base station, A control unit configured to receive upper layer signaling including configuration information for the passband from the base station, The above passband is a band that includes the backhaul or / and access link of the NCR, An NCR, characterized in that the above capability information includes at least one of a band number for one or more passbands, frequency band resource information, and inter-band capability information and / or intra-band capability information of the NCR.

10. In paragraph 9, An NCR, characterized in that the upper layer signaling includes information indicating an identifier of a passband set to the NCR and one or more frequency bands corresponding to the identifier.

11. In paragraph 10, The above upper layer signaling includes access link beam setup information, An NCR characterized in that the above access link beam setting information includes an index of one or more access link beams and an identifier of one or more passbands corresponding to each access link beam.

12. In paragraph 10, The above upper layer signaling includes access link beam setup information, An NCR characterized in that the above access link beam setting information includes an identifier of one or more passbands and an index of one or more access link beams corresponding to the identifier of each passband.

13. In a base station of a wireless communication system, Transmitter and receiver; and Receive capability information about the passband that the NCR can support from the NCR (network-controlled repeater), A control unit configured to transmit upper layer signaling including configuration information for the passband to the NCR; The above passband is a band that includes the backhaul or / and access link of the NCR, A base station, characterized in that the above capability information includes at least one of a band number for one or more passbands, frequency band resource information, and inter-band capability information and / or intra-band capability information of the NCR.

14. In paragraph 13, A base station, characterized in that the above upper layer signaling includes information indicating an identifier of a passband set to the NCR and one or more frequency bands corresponding to the identifier.

15. In paragraph 14, The above upper layer signaling includes access link beam setup information, The above access link beam configuration information includes an index of one or more access link beams and an identifier of one or more passbands corresponding to each access link beam, or A base station, characterized in that the above access link beam setting information includes an identifier of one or more passbands and an index of one or more access link beams corresponding to the identifier of each passband.

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