Method and apparatus for communication using network-controlled repeater in wireless communication system

Abstract

According to one aspect of the present disclosure, there is provided a method and apparatus for applying an aperiodic access link beam for each different subcarrier spacing (SCS) in a network controlled repeater (NCR) that processes signal relaying between a base station and a UE in a wireless communication system, a method performed by a network controlled relay (NCR) of relay signals in a wireless communication system is provided, the method including, for each different subcarrier spacing (SCS), identifying at least one reference slot to which an aperiodic access link beam is applied, and applying the aperiodic access link beam based on the at least one reference slot and a slot offset.

Description

Technical Field

[0001] This disclosure generally relates to a wireless communication system, and more specifically, to a communication method and apparatus in a wireless communication system using a repeater for network control of relaying signals between a user equipment (UE) and a base station. Background Technology

[0002] Fifth-generation (5G) mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented in frequencies below 6 GHz (“below 6 GHz”) such as 3.5 GHz, as well as in ultra-high frequency bands (“above 6 GHz”, such as 28 GHz and 39 GHz, known as millimeter wave (mmWave)). Sixth-generation (6G) mobile communication technology, known as Super 5G systems, is believed to be implemented in terahertz (THz) frequency bands (e.g., 95 GHz to 3 THz) to achieve transmission speeds up to 50 times faster than 5G mobile communication technology and ultra-low latency reduced by 1 / 10.

[0003] In the early stages of 5G mobile communication technology, standardization is underway for the following: beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission distance in mmWave; parameter sets for dynamic operation (e.g., operating multiple subcarrier spacings) for efficient utilization of mmWave resources and time slot formats; initial access technologies to support multi-beam transmission and broadband; definition and operation of BWP (bandwidth portion); new channel coding methods (such as LDPC (low-density parity-check) codes for large-scale data transmission and polar codes for highly reliable transmission of control information); L2 preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] The following items are to be standardized to meet performance requirements and support services such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC): beamforming and massive multiple-input multiple-output (MIMO) for reducing radio wave path loss and increasing propagation distance in the UHF band; support for various parameter sets to effectively utilize UHF resources (e.g., operation of multiple subcarrier gaps); dynamic operation of time slot formats; initial access techniques for supporting multi-beam transmission and broadband; definition and operation of bandwidth portions (BWP); new channel coding (such as low-density parity-check (LDPC) codes for large-scale data transmission and polar codes for highly reliable transmission of control information); layer 2 (L2) preprocessing; and network slicing for providing dedicated networks specified for specific services.

[0005] Currently, considering the services that 5G mobile communication technology is already designed to support, discussions are underway regarding improvements and performance enhancements to the initial 5G mobile communication technology. Furthermore, physical layer standardization is being implemented for technologies such as: Vehicle-to-Everything (V2X) for improving user convenience and assisting autonomous vehicles in making driving decisions based on location and status information sent from VoNR; New Radio Unlicensed (NR-U) designed to match various regulatory requirements for system operation; NR UE power saving; Non-Terrestrial Networks (NTN) (which is direct communication between the UE and satellites to ensure coverage in areas where communication with terrestrial networks is impossible); and positioning technologies.

[0006] Also being standardized are radio interface architectures / protocols for the following technologies: Industrial Internet of Things (IIoT) to support new services through association and integration with other industries; Integrated Access and Backhaul (IAB) for nodes to provide extended network service areas by supporting access links with radio backhaul links; Mobility enhancements including conditional handover and dual active protocol stack (DAPS) handover; 2-step random access channel (RACH) for NR to simplify the random access process; and 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Network Functions Virtualization (NFV) and Software Defined Networking (SDN) technologies, as well as system architectures / service areas for mobile edge computing (MEC) to receive services based on UE location.

[0007] With the commercialization of 5G mobile communication systems, the rapid development of connected devices will necessitate enhancements to the functionality and performance of 5G mobile communication systems, as well as the integrated operation of connected devices. To this end, new research will be conducted on aspects such as extended reality (XR) for effectively supporting augmented reality (AR), virtual reality (VR), and mixed reality (MR), as well as 5G performance enhancements and complexity reduction using artificial intelligence (AI) and machine learning (ML), support for AI services, support for metaverse services, and drone communications.

[0008] The development of such 5G mobile communication systems can be based on the following: multi-antenna transmission technologies (such as new waveforms for ensuring coverage in the THz band of 6G mobile communication, full-dimensional MIMO (FD-MIMO), array antennas, and massive MIMO), full-duplex technologies for enhancing the system network and frequency efficiency of 6G mobile communication technologies, reconfigurable smart surfaces (RIS), high-dimensional spatial multiplexing using orbital angular momentum (OAM), metamaterial-based lenses and antennas for enhancing coverage of THz band signals, AI-based communication technologies for system optimization using satellites and AI from the design phase by embedding end-to-end AI support functions, and next-generation distributed computing technologies for providing services with complexity exceeding the operational limits of UEs through ultra-high-performance communication and computing resources.

[0009] Therefore, there is a need in the art for a method and apparatus that provides more efficient resource management and control in wireless communication systems. Summary of the Invention

[0010] Technical issues

[0011] This disclosure has been made to at least address the problems and / or disadvantages mentioned above, and to at least provide the advantages described below.

[0012] Therefore, one aspect of this disclosure is to provide a method and apparatus for applying aperiodic access link beams for each different SCS in a network-controlled repeater (NCR) that processes signal relay between a base station and a UE in a wireless communication system.

[0013] Another aspect of this disclosure is to provide a method and apparatus for stably determining a reference time slot in the time domain in an NCR when a base station indicates an access link beam with different SCS.

[0014] Technical solution

[0015] According to one aspect of this disclosure, a method is provided performed by a network-controlled repeater (NCR) of a relay signal in a wireless communication system, the method comprising: identifying at least one reference time slot for which an aperiodic access link beam is applied for each different subcarrier spacing (SCS), and applying the aperiodic access link beam based on at least one reference time slot and a time slot offset.

[0016] According to one aspect of this disclosure, a network control repeater (NCR) for relaying signals in a wireless communication system is provided. The NCR includes a transceiver and a processor, wherein the processor is configured to identify at least one reference time slot for which an aperiodic access link beam is applied for each different subcarrier spacing (SCS), and to apply the aperiodic access link beam based on at least one reference time slot and a time slot offset. Attached Figure Description

[0017] The foregoing and other aspects, features, and advantages of certain embodiments of this disclosure will become more apparent from the following description with reference to the accompanying drawings, in which:

[0018] Figure 1 The transmission structure in the time-frequency domain is shown in an LTE, Evolved Universal Terrestrial Radio Access (E-UTRA), Advanced LTE (LTE-A) or similar wireless communication system according to an embodiment;

[0019] Figure 2 The frame, subframe, and time slot structure in 5G according to an embodiment is shown;

[0020] Figure 3 A BWP configuration in a wireless communication system according to an embodiment is shown;

[0021] Figure 4 The structure of the downlink control channel of a wireless communication system according to an embodiment is shown;

[0022] Figure 5 The structure of the downlink control channel of a wireless communication system according to an embodiment is shown;

[0023] Figure 6 An example of time axis resource allocation in a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment is shown;

[0024] Figure 7 An example of allocating resources on the PDSCH time axis in a wireless communication system according to an embodiment is shown;

[0025] Figure 8 This illustrates a semi-static HARQ-ACK codebook configuration method in an NR system according to an embodiment;

[0026] Figure 9 This illustrates a method for configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment;

[0027] Figure 10 This illustrates an example transmit / receive operation of the NCR when the NCR is relayed between the base station and the UE, according to an embodiment.

[0028] Figure 11 An example is shown of the NCR receiving a beam indication for an access link from a base station according to an embodiment;

[0029] Figure 12A An example is shown of an NCR receiving an aperiodic access link beam indication from a base station according to an embodiment;

[0030] Figure 12BThis illustrates an example of applying the access link beam in the symbol portion of the corresponding time slot based on the aperiodic access link beam indication according to an embodiment of the NCR.

[0031] Figure 13 This example illustrates the entire offset from the time slot when the NCR receives the aperiodic access link beam indication from the base station to the time slot when the access link beam is applied, according to an embodiment.

[0032] Figure 14 An example is shown of the overall offset of each different SCS indicated by the non-periodic access link beam received from the base station by the NCR according to an embodiment;

[0033] Figure 15 The following is illustrated according to an embodiment: Figure 14 Example of ensuring preparation time for NCR used in application access link beams in Case 2;

[0034] Figure 16 This illustrates a method for determining the entire offset of an access link beam in a wireless communication system according to an embodiment;

[0035] Figure 17 An example is shown according to an embodiment when the NCR uses the same maximum slot offset for slots using different SCSs;

[0036] Figure 18 An example is shown where different time resources of NCR overlap in the same symbol according to an embodiment;

[0037] Figure 19 The structure of a UE NCR in a wireless communication system according to an embodiment is shown; and

[0038] Figure 20 The structure of a base station in a wireless communication system according to an embodiment is shown. Detailed Implementation

[0039] The following description, provided with reference to the accompanying drawings, is intended to aid in a comprehensive understanding of embodiments of the present disclosure. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. For clarity and brevity, descriptions of well-known functions and constructions may be omitted.

[0040] Similarly, some elements may be shown exaggerated or schematically. The size of each element does not necessarily reflect its actual size. In all figures, the same reference numerals are used to indicate the same elements.

[0041] The advantages and features of this disclosure, as well as the methods for implementing it, can be understood from the embodiments described below in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments disclosed herein, and various modifications can be made thereto. The embodiments disclosed herein are provided merely to inform those skilled in the art of the category of this disclosure. Throughout the specification, the same reference numerals denote the same elements.

[0042] As used herein, the term "unit" refers to a software element or hardware element, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC). A unit plays a specific role. However, units are not limited to software or hardware and can be configured in a storage medium that can be addressed or configured to execute one or more processors. Therefore, units include elements (such as software elements, object-oriented software elements, class elements, and task elements), processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data schemas, tables, arrays, and variables. The functionality provided within components and units can be combined into a smaller number of components and "units," or further divided into additional components and units. Components and units can be implemented as one or more CPUs in an execution device or secure multimedia card. A unit may include one or more processors.

[0043] As used herein, each of the expressions such as A or B, at least one of A and B, at least one of A or B, A, B or C, at least one of A, B and C, and at least one of A, B or C can include all possible combinations of items listed together in a corresponding phrase. As used herein, terms such as first and second, or first and second, can be used simply to distinguish corresponding components from another component and do not otherwise limit the components.

[0044] The terminology used herein is defined in consideration of the functions described in this disclosure and may be replaced with other terms depending on the intent or practice of the user or operator. Therefore, the terminology should be defined based on the overall disclosure. In the following, a base station may be an entity that allocates resources to a terminal and may be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and network node. A terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. This disclosure is not limited to the examples described above. The following describes techniques for receiving broadcast information from a base station by a UE in a wireless communication system. This disclosure relates to communication technologies and systems for integrating 5G communication systems with IoT technologies to support high data transmission rates in post-4G systems. This disclosure can be applied to smart services based on 5G communication technologies and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail, security and safety-related services, etc.).

[0045] In the following text, terms representing broadcast information, control information, communication coverage, changes in status or event, network entities, messages, or device components are provided for illustrative purposes only. This disclosure is not limited to these terms, and other terms that are technically equivalent may also be used.

[0046] For ease of description, some terms and names defined in the 3GPP LTE standard may be used. However, this disclosure is not limited to these terms and names and is equally applicable to systems conforming to other standards.

[0047] Wireless communication systems have evolved from voice-centric services to broadband wireless communication systems that provide high data rates and high-quality packet data services, such as the 3rd Generation Partnership Project (3GPP) High Speed ​​Packet Access (HSPA), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-pro, 3GPP2 High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and the Institute of Electrical and Electronics Engineers (IEEE) 802.16e communication standard.

[0048] As a representative example of such a broadband wireless communication system, the LTE system employs Orthogonal Frequency Division Multiplexing (OFDM) for the downlink and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink. The scheme allocates and operates time-frequency resources carrying each user's data or control information to ensure they do not overlap, i.e., to maintain orthogonality, thereby distinguishing each user's data or control information.

[0049] Post-LTE communication systems (e.g., 5G communication systems) need to be flexible enough to reflect the diverse needs of users and service providers, thereby supporting services that meet a wide range of requirements. Services considered for use in 5G communication systems include, for example, enhanced mobile broadband (eMBB), massive machine-type communications (MMTC), and ultra-reliable low-latency communications (URLLC).

[0050] According to embodiments, eMBB is designed to provide further enhanced data transmission rates compared to LTE, LTE-A, or LTE-pro. For example, for a single base station, eMBB for a 5G communication system needs to provide a peak data rate of 20Gbps during download and 10Gbps during uplink. The 5G communication system also needs to provide increased user-aware data rates for the UE. To meet these requirements, further enhancements to transmit (TX) / receive (RX) technology and multiple-input multiple-output (MIMO) are needed. The data transmission rates required by the 5G communication system can be met by using a wider frequency bandwidth than 20MHz in a frequency band ranging from 3GHz to 6GHz, or 6GHz or larger, instead of the 2GHz band currently used in LTE.

[0051] mMTC is also considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To effectively deliver IoT, mMTC may be needed to support a large number of UEs within a cell, enhance UE coverage and battery life, and reduce UE costs. IoT terminals are attached to various sensors or devices to provide communication capabilities; therefore, it needs to support multiple UEs per cell (e.g., 1,000,000 UEs / km). 2 Depending on the nature of the service, a UE capable of supporting mMTC is likely to be located in shadow areas not covered by cell coverage, such as underground within buildings, and therefore may require wider coverage compared to other services provided by 5G communication systems. Due to the need for low cost and the difficulty of frequent battery replacements, UEs capable of supporting mMTC may need to have very long battery life.

[0052] As a cellular-based wireless communication service for specific purposes (mission-critical), URLLC can be used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote healthcare, and emergency alerts, and may require providing communication with ultra-low latency and ultra-high reliability. For example, services supporting URLLC need to meet an air interface latency of less than 0.5 milliseconds while having 10 -5Or even a smaller packet error rate. Therefore, for services that support URLLC, it may be necessary to design 5G communication systems to provide shorter transmission intervals (TTIs) than those used for other services, and to allocate extensive resources across the frequency band. However, the aforementioned mMTC, URLLC, and eMBB are merely examples of different service types, and the service types to which this disclosure applies are not limited to the examples described above.

[0053] In the 5G communication system described above, the services considered should be integrated together based on a framework. In other words, for effective resource management and control, preferably, services are integrated into a single system and controlled and delivered, rather than operated independently.

[0054] While this document describes LTE, LTE-A, LTE Pro, or NR systems, the embodiments can also be applied to other communication systems with similar technical backgrounds or channel configurations. Embodiments may be modified within the scope thereof without significantly departing from the scope of this disclosure as determined by those skilled in the art, and such modifications may be applicable to other communication systems.

[0055] 5G system frame structure

[0056] Figure 1 The basic structure of time-frequency resources in a wireless communication system according to an embodiment is shown.

[0057] refer to Figure 1 The horizontal axis indicates the time domain, and the vertical axis indicates the frequency domain. The basic unit of resources in both the time and frequency domains is a resource element (RE) 101, which can be defined by an OFDM symbol 102 on the time axis and a subcarrier 103 on the frequency axis. In the frequency domain, (For example, 12 consecutive REs can form a resource block (RB) 104. Multiple OFDM symbols can form a subframe 110, and It is the number of OFDM symbols per subframe 110 used for SCS setup (μ).

[0058] Figure 2 The frame, subframe, and time slot structure of a wireless communication system according to an embodiment is shown.

[0059] refer to Figure 2 A frame 200 may include one or more subframes 201, and a subframe may include one or more time slots 202. For example, a frame 200 may be defined as 10 ms. A subframe 201 may be defined as 1 ms, in which case a frame 200 may consist of a total of 10 subframes 201. A time slot 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). =14). A subframe 201 can consist of one or more time slots 202 and 203, and the number of time slots 202 and 203 in each subframe 201 can vary depending on μ (204 or 205), where μ is the setting value of SCS. Figure 2 Examples of SCS settings μ=0 (204) and μ=1 (205) are provided. When μ=0 (204), a subframe 201 can consist of one time slot 202, and when μ=1 (205), a subframe 201 can consist of two time slots (203). In other words, the number of time slots per subframe depends on the set SCS value μ. The number of time slots per frame can vary. They can be different. Depending on each SCS, μ, and The definitions are shown in Table 1 below.

[0060] [Table 1]

[0061]

[0062] In NR, a component carrier (CC) or serving cell can consist of up to 250 or more basis carriers (RBs). Therefore, if the UE always receives the entire serving cell bandwidth as in LTE, the UE's power consumption can be extreme. To address this, the base station can configure one or more basis carriers (BWPs) to allow the UE to change the reception area within the cell. In NR, the base station can configure the initial BWP for the UE via the Master Information Block (MIB), where the initial BWP is the bandwidth of Control Resource Set (CORESET) #0 (or Common Search Space (CSS)). Subsequently, the base station can set the UE's initial BWP (or first BWP) via Radio Resource Control (RRC) signaling and provide at least one or more BWP configuration information that can be indicated later via Downlink Control Information (DCI). The base station can then indicate which frequency band the UE should use by providing the BWP ID via the DCI. When the UE fails to receive the DCI in the currently allocated BWP for a specific time or longer, the UE can revert to the default BWP to attempt to receive the DCI.

[0063] 5G BWP

[0064] Figure 3 An example of BWP configuration in a wireless communication system according to an embodiment is shown.

[0065] refer to Figure 3 The UE bandwidth 300 is configured to have two BWPs, for example, BWP#1 301 and BWP#2 302. The base station can configure one or more BWPs in the UE, and for each BWP, the information shown in Table 2 below can be configured.

[0066] [Table 2]

[0067]

[0068] In Table 2, locationAndBandwidth represents the location and bandwidth of the BWP in the frequency domain, subcarrierSpacing represents the SCS to be used in the BWP, and cyclicPrefix represents whether the extended cyclic prefix (CP) is used in the BWP.

[0069] However, various other BWP-related parameters besides the configuration information described above can be configured in the UE. The information described above can be delivered from the base station to the UE via higher-layer signaling (e.g., RRC signaling). At least one of the configured BWPs can be activated. Whether a configured BWP is activated can be semi-statically transmitted from the base station to the UE via RRC signaling, or dynamically transmitted from the base station to the UE via MAC control element (CE) or DCI.

[0070] Before RRC is established, the UE can be configured with an initial BWP for initial access via the MIB by the base station. More specifically, during the initial access phase, the UE can receive configuration information for the search space and CORESET via the MIB, wherein the Physical Downlink Control Channel (PDCCH) can be transmitted to receive system information for initial access (Residual System Information (RMSI) or System Information Block 1 (SIB1)). Each of the control area and search space configured with the MIB can be considered as ID 0.

[0071] The base station can provide configuration information to the UE via the MIB, such as frequency allocation information, time allocation information, and a parameter set for control area #0. The base station can also provide the UE with configuration information for the timing and monitoring period of control area #0, i.e., configuration information for search space #0, via the MIB. The UE can consider the frequency range obtained from the MIB and set to control area #0 as the initial BWP for initial access. In this case, the ID of the initial BWP can be considered as 0.

[0072] The configuration of BWP supported by the next-generation mobile communication system (5G or NR system) described above can be used for a variety of purposes.

[0073] For example, when the bandwidth supported by the UE is less than the system bandwidth, the bandwidth supported by the UE can be supported by configuring the BWP. For example, as the frequency position of the BWP in Table 2 (configuration information 2) is configured in the UE through configuration information 2, the UE can send and receive data at a specific frequency position within the system bandwidth.

[0074] As another example, to support different parameter sets, the base station can configure multiple BWPs in the UE. For instance, to support data transmission / reception using 15kHz and 30kHz SCS for some UEs, two BWPs can be configured to use 15kHz and 30kHz SCS respectively. Different BWPs can be frequency-division multiplexed (FDM), and the BWP configured for the corresponding SCS can be activated when data needs to be transmitted / received at a specific SCS.

[0075] As another example, to reduce UE power consumption, the base station can configure BWPs with different bandwidth sizes in the UE. For instance, significant power consumption can occur when the UE supports bandwidths exceeding a very large bandwidth (e.g., 100MHz) and always uses that bandwidth to send / receive data. In particular, when there is no service, it is very inefficient in terms of power consumption for the UE to monitor unnecessary downlink control channels with a large bandwidth of 100MHz. Therefore, to reduce UE power consumption, the base station can configure a relatively small bandwidth BWP in the UE, such as a 20MHz BWP. When there is no service, the UE can perform monitoring operations in the 20MHz BWP, and when data is generated, the UE can use the 100MHz BWP to send and receive data according to instructions from the base station.

[0076] In the method for configuring the BWP described above, the UE can receive initial bandwidth configuration information via the MIB during the initial access phase before RRC is established. More specifically, the UE can be configured with a CORESET for the downlink control channel, wherein the DCI of the scheduling system information block (SIB) can be transmitted from the MIB of the physical broadcast channel (PBCH). The bandwidth configured by the MIB can be considered as the initial BWP, and the UE can receive the PDSCH for transmitting the SIB via the initial BWP. The initial BWP can be used for other system information (OSI), paging and random access, and for receiving SIBs.

[0077] SSB / PBCH

[0078] The SS / PBCH block can indicate a physical layer channel block consisting of a primary SS (PSS), secondary SS (SSS), and PBCH. More specifically, the SS / PBCH block can be defined as follows.

[0079] The PSS serves as a reference for downlink time / frequency synchronization and can provide some information for the cell ID.

[0080] The SSS is used as a reference for downlink time / frequency synchronization and can provide additional information such as the cell ID not provided by the PSS. Additionally, it can be used as a reference signal for demodulation of the PBCH.

[0081] The PBCH can provide the basic system information necessary for the UE to transmit and receive data and control channels. This necessary system information may include search space-related control information, radio resource mapping information indicating the control channels, and scheduling control information for separate data channels used to transmit system information.

[0082] An SS / PBCH block can consist of a combination of PSS, SSS, and PBCH. One or more SS / PBCH blocks can be sent within 5ms, and each sent SS / PBCH block can be distinguished by an index.

[0083] The UE can detect the PSS and SSS during the initial access phase and can decode the PBCH. The UE can obtain the MIB from the PBCH and configure control area #0 through the MIB. The UE can perform monitoring on control area #0, assuming the selected SS / PBCH block and the demodulation reference signal (DMRS) quasi-co-located (QCLed) transmitted in control area #0. The UE can receive system information as DCI transmitted in control area #0. The UE can obtain configuration information related to the RACH required for initial access from the received system information. The UE can send a physical RACH (PRACH) to the base station considering the selected SS / PBCH index, and the base station receiving the PRACH can obtain information for the SS / PBCH block index selected by the UE. The base station can know which SS / PBCH block the UE has used and the monitoring control area #0 corresponding to (or associated with) the SS / PBCH block selected by the UE.

[0084] PDCCH: DCI

[0085] In 5G or NR systems, scheduling information for uplink data (or Physical Uplink Shared Channel (PUSCH)) or downlink data (or PDSCH) in the 5G system can be transmitted from the base station to the UE via DCI. The UE can monitor the back-off DCI format and the non-back-off DCI format used for PUSCH or PDSCH. The back-off DCI format can consist of fixed fields predefined between the base station and the UE, while the non-back-off DCI format can include configurable fields.

[0086] DCI messages can be transmitted via PDCCH through channel coding and modulation. Cyclic Redundancy Check (CRC) is added to the DCI message payload, and the CRC is scrambled using a Radio Network Temporary Identifier (RNTI) that serves as the UE's identifier. Different RNTIs can be used to scramble the CRC attached to the DCI message payload based on the DCI message (e.g., UE-specific data transmissions, power control commands, or random access responses). In other words, the RNTI is not explicitly transmitted; instead, it is included in the CRC calculation process and transmitted accordingly. If the UE receives a DCI message transmitted on the PDCCH, it can use the assigned RNTI to identify the CRC. If the CRC identification is correct, the UE knows that the message was sent to it.

[0087] For example, the DCI for scheduling PDSCH used for System Information (SI) can be scrambled to SI-RNTI. The DCI for scheduling PDSCH used for Random Access Response (RAR) messages can be scrambled to RA-RNTI. The DCI for scheduling PDSCH used for paging messages can be scrambled to P-RNTI. The DCI providing Slot Format Indicator (SFI) can be scrambled to SFI-RNTI. The DCI providing Transmit Power Control (TPC) can be scrambled to TPC-RNTI. The DCI for scheduling UE-specific PDSCH or PUSCH can be scrambled using Cell RNTI (C-RNTI).

[0088] DCI format 0_0 can be used as a backoff DCI for scheduling PUSCH, and in this case, CRC can be scrambled to C-RNTI. The DCI format 0_0 with CRC scrambled to C-RNTI can include the information shown in Table 3 below.

[0089] [Table 3]

[0090]

[0091] DCI format 0_1 ​​can be used as a non-back-off DCI for scheduling PUSCH, and in this case, CRC can be scrambled to C-RNTI. DCI format 0_1 ​​with CRC scrambled to C-RNTI can include the information shown in Table 4 below.

[0092] [Table 4]

[0093]

[0094]

[0095] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH. In this case, CRC can be scrambled to C-RNTI. DCI format 1_0 with CRC scrambled to C-RNTI can include the information shown in Table 5 below.

[0096] [Table 5]

[0097]

[0098] Alternatively, DCI format 1_0 can be used as the PDSCH for scheduling RAR messages, and CRC can be scrambled to RA-RNTI. DCI format 1_0 with CRC scrambled to RA-RNTI can include the information shown in Table 6 below.

[0099] [Table 6]

[0100]

[0101] DCI format 1_1 can be used as a non-back-off DCI for scheduling PDSCH, and in this case, CRC can be scrambled to C-RNTI. DCI format 1_1 with CRC scrambled to C-RNTI can include the information shown in Table 7 below.

[0102] [Table 7]

[0103]

[0104] Regarding PDCCH and PDSCHQCL rules

[0105] When a UE operates in carrier aggregation (CA) within a frequency band or a single cell, and multiple control resource sets existing in the BWP activated in a single or multiple cells have the same or different QCL-Type characteristics or overlap with each other over time during a specific PDCCH monitoring period, the UE can select a specific control resource set based on QCL priority sorting operation and monitor the control resource set with the same QCL-Type D characteristic as the corresponding control resource set. In other words, when multiple control resource sets overlap over time, only one QCL-Type D characteristic can be received. In this case, the criteria used to determine QCL priority can be as follows.

[0106] Standard 1. In the cell containing the CSS that corresponds to the lowest index, connect to the control resource set with the lowest index of the CSS.

[0107] Standard 2. A set of control resources connected to the UE-specific search space with the lowest index in the cell corresponding to the lowest index among cells that include UE-specific search spaces;

[0108] When the above criteria are not met, the following criteria apply. For example, when control resource sets overlap over time during a specific PDCCH monitoring period, if all control resource sets are not connected to the CSS but to the UE-specific search space, i.e., if criterion 1 is not met, then the UE can apply criterion 2 and omit criterion 1.

[0109] When the UE selects a control resource set based on the criteria described above, the UE may consider the following two additional matters regarding the QCL information set in the control resource set. First, when control resource set 1 has CSI-RS1 as a reference signal in which control resource set 1 has a QCL-TypeD relationship, where the reference signal for the QCL-TypeD relationship in CSI-RS1 is SSB1, and another control resource set 2 has a reference signal for the QCL-TypeD relationship in SSB1, the UE may consider that the two control resource sets 1 and 2 have different QCL-TypeD characteristics. Second, when the UE has CSI-RS1 configured in cell 1 as a reference signal in which control resource set 1 has a QCL-TypeD relationship, wherein the reference signal for CSI-RS1 having a QCL-TypeD relationship is SSB1, and control resource set 2 has CSI-RS2 configured in cell 2 as a reference signal in which control resource set 2 has a QCL-TypeD relationship, wherein the reference signal for CSI-RS2 having a QCL-TypeD relationship is SSB1, the UE can consider that the two control resource sets have the same QCL-TypeD characteristics.

[0110] Figure 4 The structure of the downlink control channel of a wireless communication system according to an embodiment is shown. That is, Figure 4 It involves the basic units of time and frequency resources that make up the download control channels available in 5G.

[0111] refer to Figure 4 The basic unit of time and frequency resources that constitutes the control channel can be defined as a RE group (REG) 403. A REG 403 can be defined using an OFDM symbol 401 and a physical RB (PRB) 402 (i.e., 12 subcarriers) on the time axis. The base station can configure the downlink control channel allocation unit by cascading REG 403.

[0112] If the basic unit for allocating downlink control channels in 5G is a Control Channel Element (CCE) 404, then one CCE 404 can be composed of multiple REG 403s. For example, Figure 5The REG 403 shown can consist of 12 REs, and if a CCE 404 consists of six REG 503s, then a CCE 404 can consist of 72 REs. When a download control area is set up, the area can consist of multiple CCE 404s, and a specific download control channel can be mapped to one or more CCE 404s and transmitted according to the aggregation level (AL) in the control area. CCE 404s in the control area are distinguished by numbering, and in this case, the CCE 404 numbers can be assigned according to a logical mapping scheme.

[0113] Figure 4 The basic unit of the downlink control channel (i.e., REG 403) shown can contain the RE to which the DCI is mapped and the region to which the DMRS 405 (a reference signal for decoding the RE) is mapped. As shown, three DMRS 405s can be transmitted within one REG 403. Depending on AL, the number of CCEs required to transmit the PDCCH can be, for example, 1, 2, 4, 8, or 16, and link adaptation of the downlink control channel can be achieved using different numbers of CCEs. For example, if AL=1, a downlink control channel can be transmitted via L CCEs.

[0114] The UE needs to detect signals without knowing the information used for the downlink control channel, and for blind decoding, a search space for the set of CCEs is defined. The search space is the set of downlink control channel candidates consisting of CCEs that the UE should attempt to decode on a given AL. Since there are several ALs for creating bundles of 1, 2, 4, 8, or 16 CCEs, the UE can have multiple search spaces. The search space set (set) can be defined as the set of search spaces at all configured ALs.

[0115] The search space can be categorized into CSS and UE-specific search spaces. A pre-defined group of UEs or all UEs can search the PDCCH CSS to receive cell common control information, such as paging messages or dynamic scheduling for system information.

[0116] For example, a UE can receive PDSCH scheduling allocation information for transmitting SIBs containing, for example, cell service provider information by examining the CSS of the PDCCH. In the case of CSS, since a group of UEs or all UEs need to receive the PDCCH, the CSS can be defined as a set of previously agreed CCEs. Simultaneously, a UE can receive scheduling allocation information for UE-specific PDSCH or PUSCH by examining the UE-specific search space of the PDCCH. The UE-specific search space can be UE-specific, defined using various system parameters and the UE's identifier.

[0117] In 5G, parameters for the search space used for PDCCH can be configured by the base station in the UE via higher-layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the base station can configure the UE, for instance, the number of PDCCH candidates at each AL=L, the monitoring period for the search space, the monitoring timing of symbol cells in the time slots of the search space, the search space type (CSS or UE-specific search space), the combination of RNTI and DCI formats to be monitored in the search space, and the control area index to be monitored in the search space. For example, the configuration described above may include the information shown in Table 8 below.

[0118] [Table 8]

[0119]

[0120] Based on configuration information, the base station can configure one or more search space sets for the terminal. The base station can configure the UE with search space set 1 and search space set 2, and configure them to monitor DCI format A scrambled to X-RNTI in search space set 1 in the CSS, and monitor DCI format B scrambled to Y-RNTI in search space set 2 in the UE-specific search space.

[0121] Based on the configuration information described above, one or more search space sets can exist in CSS or UE-specific search spaces. For example, search space set #1 and search space set #2 can be configured as CSS, and search space set #3 and search space set #4 can be configured as UE-specific search spaces.

[0122] CSS can be categorized into specific types of search space sets based on its purpose. The RNTIs to be monitored can vary for each specific search space set type. For example, the CSS types, purposes, and RNTIs to be monitored can be categorized as shown in Table 9 below.

[0123] [Table 9]

[0124]

[0125] In CSS, combinations of DCI formats and RNTI can be monitored, but this disclosure is not limited to the examples described below.

[0126] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, and SI-RNTI.

[0127] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0128] DCI format 2_1 with CRC scrambled by INT-RNTI

[0129] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI and TPC-PUCCH-RNTI

[0130] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0131] Within the UE-specific search space, combinations of DCI formats and RNTI can be monitored. Of course, this is not limited to the embodiments described below.

[0132] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, and TC-RNTI

[0133] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, and TC-RNTI

[0134] The specified RNTI can be defined and used as follows.

[0135] C-RNTI (Cell RNTI): Used for scheduling UE-specific PDSCH

[0136] Temporary Cell RNTI (TC-RNTI): Used to schedule UE-specific PDSCH

[0137] Configured Scheduling RNTI (CS-RNTI): Used to schedule UE-specific PDSCHs with semi-static configuration.

[0138] Random Access RNTI (RA-RNTI): Used for scheduling PDSCH during the random access phase.

[0139] Paging RNTI (P-RNTI): Used to schedule the PDSCH sent for paging.

[0140] System Information RNTI (SI-RNTI): Used to schedule the PDSCH in which system information is sent.

[0141] Interrupt RNTI (INT-RNTI): Used to indicate whether a PDSCH is punched.

[0142] Transmit power control for PUSCH RNTI (TPC-PUSCH-RNTI): Used to indicate power control commands for PUSCH.

[0143] Transmit power control for PUCCH RNTI (TPC-PUCCH-RNTI): Used to indicate power control commands for PUCCH.

[0144] Transmit power control for SRS RNTI (TPC-SRS-RNTI): Used to instruct SRS power control commands.

[0145] The DCI format described above can be defined as shown in Table 10 below.

[0146] [Table 10]

[0147]

[0148] In 5G, multiple search space sets can be configured with different parameters (e.g., the parameters in Table 8). Therefore, the set of search spaces monitored by the UE at each time point can vary. For example, when search space set #1 is set in time slot X and search space set #2 is set in time slot Y, and X is different from Y, the UE can monitor both search space set #1 and search space set #2 in a specific time slot, and monitor either search space set #1 or search space set #2 in that specific time slot.

[0149] When multiple search space sets are configured for a UE, the following conditions can be considered to determine which search space set should be monitored by the UE.

[0150] Condition 1: Limitation on the maximum number of PDCCH candidate groups

[0151] The number of PDCCH candidates that can be monitored per time slot can not exceed M. μ M μ It can be defined as being set to SCS 15.2 μ The maximum number of PDCCH candidates per time slot in a kHz cell can be defined as shown in Table 11 below.

[0152] [Table 11]

[0153]

[0154] Condition 2: Limitation on the maximum number of CCEs

[0155] The number of CCEs constituting the entire search space in each time slot (where the entire search space can refer to the entire set of CCEs corresponding to the union region of multiple search space sets) can not exceed C μ C μ It can be defined as being set to SCS15.2 μ The maximum number of CCEs per time slot in a cell of kHz can be defined as shown in Table 12 below.

[0156] [Table 12]

[0157]

[0158] For ease of description, the condition that both conditions 1 and 2 above are satisfied at a specific point in time can be defined as condition A. Therefore, not satisfying condition A can indicate that at least one of conditions 1 and 2 above is not satisfied.

[0159] Depending on the base station's configuration of the search space set, there may be times when condition A is not met at a specific point in time. If condition A is not met at a specific point in time, the UE can select only some search space sets configured to meet condition A at that point in time to perform monitoring, and the base station can send PDCCH through the selected search space sets.

[0160] As a method for selecting some search spaces from the search space set of the entire configuration, the following approach can be followed.

[0161] Method 1

[0162] When PDCCH condition A is not met at a specific time point (time slot), the UE (or base station) may, with priority over the search space set set that is set to CSS, select the search space set whose search space type is set to CSS from the search space set that exists at the corresponding time point.

[0163] When all search space sets set as CSS are selected (i.e., when condition A is met even after all search spaces set as CSS are selected), the UE (or base station) can select a search space set set as a UE-specific search space. In this case, when multiple search space sets are set as UE-specific search spaces, the search space set with a lower search space set index can have a higher priority. Considering the priority, the UE or base station can select a UE-specific search space set within the range that condition A is met.

[0164] The following describes a method for allocating time and frequency resources for data transmission in NR.

[0165] In NR, in addition to the frequency domain resource candidate allocation indicated by BWP, the following detailed frequency domain resource allocation (FD-RA) methods are also available.

[0166] Figure 5 An example of frequency domain resource allocation for a PDSCH in a wireless communication system according to an embodiment is shown.

[0167] Figure 5 Three frequency domain resource allocation methods are shown: Type 0 500, Type 1 505, and Dynamic Switching 510, which can be configured by higher layers in NR.

[0168] refer to Figure 5 If the UE is configured via higher-layer signaling to use only resource type 0 (500), then some DCIs used to allocate PDSCH to the UE have a bit mapping 515 consisting of NRBG bits. The conditions are as follows. In this case, the NRBG indicates the number of RB groups (RBGs) determined according to the BWP size allocated by the BWP indicator and the higher-layer parameter rbg-Size as shown in Table 13 below, and data is transmitted in the RBGs, where the bit mapping represents 1.

[0169] [Table 13]

[0170]

[0171] If the UE is configured to use only resource type 1 (505) via higher-layer signaling, then some DCIs that allocate PDSCH to the corresponding UE have the following characteristics: Frequency axis resource allocation information consisting of bits. The conditions are as follows. Therefore, the base station can set a starting virtual RB (VRB) 520 and a length 525 of frequency axis resources continuously allocated from it.

[0172] If the UE is configured via higher-layer signaling to use both resource type 0 and resource type 1 (510), then some DCIs that allocate PDSCH to the UE have frequency axis resource allocation information consisting of the larger of the payload 515 for setting resource type 0 and the payloads 520 and 525 for setting resource type 1 (535). The conditions are as follows. In this case, a bit can be added to the beginning of the frequency axis resource allocation information in the DCI (e.g., the most significant bit (MSB)). When the corresponding bit is 0, this indicates that resource type 0 is used, and when the corresponding bit is 1, this indicates that resource type 1 is used.

[0173] The base station can configure tables for time-domain resource allocation information for PDSCH and PUSCH for the UE via higher-layer signaling (e.g., RRC signaling). For PDSCH, a table including up to maxNrofDL-Allocations=16 entries can be configured, and for PUSCH, a table including up to maxNrofUL-Allocations=16 entries can be configured. The time-domain resource allocation information may include, for example, PDCCH to PDSCH time slot timing (which is designated as K0 and corresponds to the time interval between the PDCCH reception time and the PDSCH transmission time scheduled by the received PDCCH) or PDCCH to PUSCH time slot timing (which is designated as K2 and corresponds to the time interval between the PDCCH time and the PUSCH transmission time scheduled by the received PDCCH), information on the position and length of the start symbol for scheduling PDSCH or PUSCH in the time slot, and the mapping type of PDSCH or PUSCH. For example, the base station can provide the UE with information as shown in Table 14 or Table 15 below.

[0174] [Table 14]

[0175]

[0176] [Table 15]

[0177]

[0178] The base station can provide the UE with one of the entries in a table for time-domain resource allocation information via L1 signaling (e.g., DCI) (e.g., it can be indicated by the "Time-domain Resource Allocation" field in the DCI). The UE can obtain time-domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0179] Figure 6 An example of time axis resource allocation for PDSCH in a wireless communication system according to an embodiment is shown.

[0180] refer to Figure 6 The base station can use the SCS configured with data channels and control channels at higher layers. The position of the PDSCH resource on the time axis is indicated by the time slot offset (K0) and the OFDM symbol start position 600 and length 605 in a time slot 610 dynamically indicated by DCI.

[0181] Figure 7 An example is shown of allocating resources on the time axis according to the SCS of the data channel and the control channel in a wireless communication system according to an embodiment.

[0182] refer to Figure 7When the SCS of the data channel and the control channel are the same (700, The time slot numbers used for data and control are the same, allowing the base station and UE to know the generation of the scheduling offset based on the predetermined time slot offset K0. Conversely, when the SCS of the data channel and the control channel are different from each other (705, The different time slot numbers used for data and control allow the base station and UE to know the generation of the scheduling offset based on the predetermined time slot offset K0 relative to the PDCCH SCS.

[0183] QCL, TCI status

[0184] In wireless communication systems, one or more different antenna ports (which can be replaced by one or more channels, signals or combinations thereof, but for ease of description, they are collectively referred to as different antenna ports) can be associated with each other through quasi-co-addressing (QCL) configuration, as shown in Table 16 below.

[0185] The TCI state is used to declare the QCL relationship between the PDCCH (or PDCCH DMRS) and another RS ​​or between channels. When some reference antenna ports A (reference RS #A) and another target antenna port B (target RS #B) are QCLed with each other, this indicates that the UE is allowed to apply all or some of the large-scale channel parameters estimated in antenna port A to channel measurements from antenna port B. The QCL may need to be context-dependent to associate different parameters, such as time tracking affected by average delay and delay spread, frequency tracking affected by Doppler shift and Doppler spread, radio resource management (RRM) affected by average gain, and beam management (BM) affected by spatial parameters. Therefore, NR supports four types of QCL relationships, as shown in Table 16 below.

[0186] [Table 16]

[0187]

[0188] Spatial RX parameters can collectively indicate all or some of various parameters, such as angle of arrival (AoA), power angle spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0189] QCL relationships can be configured to the UE via the RRC parameters TCI-State and QCL-Info, as shown in Table 17 below. Referring to Table 17, the base station can configure one or more TCI states for the UE, indicating up to two QCL relationships (qcl-Type1 and qcl-Type2) for the RS (i.e., the target RS) whose ID is used to reference the TCI state. In this case, the QCL information (QCL-Info) included in each TCI state includes the serving cell index and BWP index of the reference RS indicated by the QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 16 above.

[0190] [Table 17]

[0191]

[0192] HARQ-ACK feedback transmission method and equipment

[0193] The NR system employs a Hybrid Automatic Repeat Request (HARQ) scheme, which retransmits the corresponding data at the physical layer in the event of decoding failure during the initial phase of transmission. With HARQ, if the receiver fails to decode the data accurately, it sends a negative acknowledgment (NACK) to the transmitter, allowing the transmitter to retransmit the data at the physical layer. The receiver improves its data reception capability by combining the retransmitted data with the previously failed-to-decode data. When the receiver decodes the data accurately, it sends an acknowledgment (ACK) to the transmitter, allowing the transmitter to send new data.

[0194] The following describes a method for configuring HARQ-ACK feedback bits when a UE sends multiple HARQ-ACKs in a single time slot on the uplink.

[0195] In NR, the base station can configure one or more CCs to the UE for downlink transmission. Each CC can have downlink and uplink transmission time slots and symbols configured therein. When the PDSCH, as downlink data, is scheduled, at least one of the following can be transmitted: time slot timing information to which the PDSCH is mapped in a specific bit field of the DCI, the starting symbol position to which the PDSCH is mapped in the corresponding time slot, and information about the number of symbols to which the PDSCH is mapped. For example, when the DCI is transmitted and the PDSCH is scheduled in time slot n, if K0, as the time slot timing information to which the PDSCH is transmitted, indicates 0, and the starting symbol position is 0, and the symbol length is 7, then the seven symbols of the PDSCH mapped to time slot n, starting from symbol 0, are transmitted. K1 time slots after the PDSCH, as a downlink data signal, is transmitted, HARQ-ACK feedback is transmitted from the UE to the base station. K1 information, which is the timing information in which HARQ-ACK is sent, is transmitted in the DCI, and a set of possible candidates for K1 value can be transmitted via higher-layer signaling, and one of them can be determined in the DCI.

[0196] When the UE is configured with a semi-static HARQ-ACK codebook, the UE can determine a table including K0, start symbol information, the number or length of symbols (which is the time slot information mapped to the PDSCH), and feedback bits (or HARQ-ACK codebook size). The feedback bits (or HARQ-ACK codebook size) should be sent using K1 candidate values, where K1 candidate values ​​are the HARQ-ACK feedback timing information for the PDSCH. The table including the time slot information mapped to the PDSCH, start symbol information, and the number or length of symbols can vary depending on default values, or it can be configured by the base station for the UE.

[0197] When a UE is configured with a dynamic HARQ-ACK codebook, the UE can determine the HARQ-ACK feedback bits (or HARQ-ACK codebook size) that should be sent in the time slot in which the HARQ-ACK information is sent, through the UE downlink assignment indicator (DAI) included in the DCI, using the K0 value (which is the time slot information in which the PDSCH is mapped) and the K1 value (which is the HARQ-ACK feedback timing information used for the PDSCH).

[0198] Figure 8 A semi-static HARQ-ACK codebook configuration method in an NR system according to an embodiment is shown.

[0199] When the number of HARQ-ACK PUCCHs that a UE can send in a time slot is limited to one, if the UE receives a higher-layer signal configuring a semi-static HARQ-ACK codebook, the UE can report HARQ-ACK information for SPS PDSCH release or receive PDSCH from the HARQ-ACK codebook in the time slot indicated by the value of the PDSCH-to-HARQ_feedback timing indicator field included in DCI format 0_1 ​​or DCI format 1_1. The UE can also report HARQ-ACK information bit values ​​as NACK in the HARQ-ACK codebook in a time slot not indicated by the PDSCH-to-HARQ_feedback timing indicator field in DCI format 1_0 or DCI format 1_1. If the UE reports only HARQ-ACK information for receiving a PDSCH or an SPS PDSCH release in the MA,c case for receiving candidate PDSCHs, and reports that it is scheduled in the Pcell by DCI format 1_0 (DCI format 1_0 includes information in which the counter DCI field is indicated as 1), then the UE can determine a HARQ-ACK codebook for the corresponding PDSCH reception or the corresponding SPS PDSCH release.

[0200] Otherwise, the HARQ-ACK codebook determination method can be executed according to the following method.

[0201] If the set of PDSCH reception candidates is MA,c in the serving cell c, then MA,c can be obtained through the following steps in pseudocode 1.

[0202] Pseudocode 1 begins

[0203] Step 1: Initialize j to 0, and initialize MA,c to an empty set. Initialize the HARQ-ACK transmission timing index k to 0.

[0204] Step 2: Set R to a set of rows from a table that includes slot information, start symbol information, symbol count, or length information for PDSCH mapping. If the PDSCH-may-mapped symbol indicated by each value of R is set to a UL symbol according to the DL and UL configuration described above, then delete the corresponding row from R.

[0205] Step 3-1: If the UE is able to receive a PDSCH for unicast in a time slot and R is not an empty set, then add one to the set MA,c.

[0206] Step 3-2: If the UE is able to receive more than one PDSCH for unicast in a time slot, count the PDSCHs that can be assigned to different symbols in the calculated R and add them to MA,c.

[0207] Step 4: Increase k by one and start over from step 2.

[0208] Pseudocode 1 ends

[0209] refer to Figure 8 The pseudocode 1 described above illustrates this. To perform HARQ-ACK PUCCH transmission in time slot #k 808, the UE can consider all time slot candidates that can indicate the PDSCH-to-HARQ-ACK timing for time slot #k 808. Figure 8 In this context, it is assumed that HARQ-ACK transmission is possible in time slot #k 808 via a PDSCH-to-HARQ-ACK timing combination, where, for this PDSCH-to-HARQ-ACK timing combination, only PDSCHs scheduled in time slots #n 802, #n+1 804, and #n+2 806 are possible. Considering the time-domain resource configuration information for the schedulable PDSCHs in each of time slots 802, 804, and 806, as well as information indicating whether the symbols in the time slots are downlinks or uplinks, the maximum number of PDSCHs schedulable per time slot can be derived. For example, assuming that a maximum scheduling of 2 PDSCHs in time slot 802, 3 PDSCHs in time slot 804, and 2 PDSCHs in time slot 806 is possible, the maximum total number of PDSCHs included in the HARQ-ACK codebook transmitted in time slot 808 is 7, which indicates the cardinality of the HARQ-ACK codebook.

[0210] Figure 9 A method for configuring a dynamic HARQ-ACK codebook in an NR system according to an embodiment is shown.

[0211] refer to Figure 9 The UE can send HARQ-ACK information in a PUCCH in slot n based on K0 (which is the transmission slot location information of the PDSCH scheduled in DCI format 1_0 or 1_1) and the PDSCH-to-HARQ_feedback timing value of the PUCCH transmission for SPS PDSCH release or PDSCH reception HARQ-ACK information.

[0212] Specifically, for the HARQ-ACK information transmission described above, the UE can determine the HARQ-ACK codebook of the PUCCH transmitted in the time slot determined by K0 and the PDSCH-to-HARQ_feedback timing based on the DAI included in the DCI indicating SPS PDSCH release or PDSCH.

[0213] The DAI includes a counter DAI (cCounter DAI) and a total DAI (tTotal DAI). The counter DAI indicates the position of the HARQ-ACK information in the HARQ-ACK codebook corresponding to the PDSCH scheduled in DCI format 1_0 or DCI format 1_1. Specifically, the value of the counter DAI in DCI format 1_0 or 1_1 indicates the accumulated value of SPS PDSCH releases or PDSCH receptions scheduled by DCI format 1_0 or DCI format 1_1 in a specific cell c. The accumulated value described above is set based on the serving cell and the PDCCH monitoring timing of the scheduled DCI.

[0214] The total DAI indicates the size of the HARQ-ACK codebook. Specifically, the total DAI value indicates the total number of previously scheduled PDSCH or SPSPDSCH releases, including the time when the DCI was scheduled (PDCCH monitoring timing). The total DAI is used when the HARQ-ACK information in the serving cell c in the CA context also includes HARQ-ACK information for scheduling PDSCHs in another cell that includes serving cell c. In other words, the total DAI parameter does not exist in a system operating as a single cell.

[0215] Figure 9 This illustrates example UE operations related to DAI when a dynamic HARQ-ACK codebook is used. Figure 9 The diagram shows the changes in the values ​​of the counter DAI (C-DAI) and total DAI (T-DAI) indicated by the DCI detected for each PDCCH monitoring timing set for each carrier when the UE is configured with two carriers c and transmits the HARQ-ACK codebook based on the DAI selection in the nth time slot of carrier 902 on PUCCH 920. In the DCI detected at m=0 (906), both C-DAI and T-DAI indicate a value of 1 (912). In the DCI detected at m=1 (908), both C-DAI and T-DAI indicate a value of 2 (914). In the DCI detected for carrier 0 (C=0, 902) for m=2 (910), C-DAI indicates a value of 3 (916). In the DCI detected for carrier 1 (C=1, 904) for m=2 (910), C-DAI indicates a value of 4 (918). In this case, if carriers 0 and 1 are scheduled at the same monitoring time, all T-DAIs are indicated as 4.

[0216] exist Figure 8 and Figure 9In this context, HARQ-ACK codebook determination operates under the assumption that only one PUCCH containing HARQ-ACK information is transmitted in a single time slot. In the method of determining a PUCCH transmission resource within a time slot, when PDSCHs scheduled in different DCIs are multiplexed into a single HARQ-ACK codebook and transmitted in the same time slot, the PUCCH resource selected for HARQ-ACK transmission can be determined as the PUCCH resource indicated by the PUCCH resource field already indicated in the DCI that last scheduled the PDSCH. In other words, PUCCH resources indicated by the PUCCH resource field in DCIs scheduled prior to the DCI described above are ignored.

[0217] <Network-controlled repeaters>

[0218] Coverage is one of the most important factors in wireless communication systems. Currently, 5G systems and millimeter wave technology are commercially available. However, due to their limited coverage, they are not widely used. Many operators are seeking economical methods that can provide stable coverage.

[0219] Integrated Access and Backhaul (IAB) has been studied in 3GPP Rel-16 and Rel-17. IAB is a technology designed to find more economical ways to enhance stable coverage in wireless communication systems. IAB is a type of relay that does not require a wired backhaul network and can relay between the base station and the UE. IAB provides similar performance to a base station, but its use may lead to increased network costs.

[0220] Furthermore, traditional RF repeaters can be considered to provide stable coverage in wireless communication systems. An RF repeater is the most basic unit of a repeater; it amplifies and transmits signals from communication devices. RF repeaters have the advantage of reducing network costs because they simply amplify and transmit signals. However, RF repeaters cannot proactively respond to various situations that may occur in the network. For example, RF repeaters are typically omnidirectional antennas, not directional antennas, and therefore cannot achieve beamforming gain. Additionally, even when no UE is connected to the RF repeater, it amplifies noise and transmits signals, which can lead to interference. The IAB and RF repeaters mentioned above have obvious advantages and disadvantages because they are biased only towards cost or performance. The reality is that increasing coverage in a wireless communication system requires not only performance but also cost, which is why new UEs or amplifiers that consider both performance and cost are needed.

[0221] 3GPP Rel-18 is standardizing what's known as the Network Controlled Repeater (NCR), which enhances coverage by using adaptive antennas in RF repeaters to implement beamforming technology while maintaining the amplification and transmission operations of the RF repeater. To transmit signals to the UE using adaptive antennas indoors, the NCR should be able to receive control signals from the base station. Therefore, the NCR should be able to detect and decode control signals from the base station and, like the UE, can have transmit / receive structures for control signals. Essentially, the NCR can amplify signals transmitted from the base station and send the amplified signal to the UE, and can amplify signals from the UE and send the amplified signal to the base station. In other words, the NCR can simply amplify and transmit signals or channels to / from the base station and the UE without detecting and decoding the signals or channels. Therefore, the UE cannot know whether the NCR is involved in communication between the base station and the UE. In other words, the UE can distinguish between the base station and the NCR and can treat the NCR as the base station. The UE does not need any additional or operational components for the NCR. Therefore, the NCR can support any type of UE.

[0222] As described above, the base station can treat the NCR as a regular UE. When the NCR is first installed in the network, it can perform initial access to the base station like a regular UE and notify the base station that it is an NCR. After the base station recognizes the NCR and a higher-layer connection (e.g., an RRC connection) is established between the base station and the UE, the NCR can receive the configuration required for amplification and transmission operations from the base station. The base station does not need to know whether the UE is directly connected to the base station or connected via the NCR for control purposes. Various implementations can determine whether the UE served by the base station is within or outside the coverage area of ​​the NCR.

[0223] The base station can know which UEs are communicating via which NCR, but the NCR may not know which UEs are communicating via which NCR. The NCR can perform operations such as amplifying signals and sending signals to UEs, controlled by the base station, regardless of whether a UE is within the coverage area of ​​the NCR. The base station may need dynamic control signals to control the NCR. In this disclosure, such control signals may be referred to as Side Control Information (SCI). SCI represents control information transmitted by the base station on the control channel to control the NCR. SCI may not be identifiable by the UE, but it can be identifiable by the base station and the NCR. For example, SCI may include Cyclic Redundancy Check (CRC) scrambled with the Radio Network Temporary Identifier (RNTI) only for the NCR, and SCI may be transmitted on the PDCCH where Downlink Control Information (DCI) is transmitted. In this disclosure, the term "SCI" ​​is used for convenience of description, and "SCI" ​​and "DCI" are used interchangeably. Figure 10This illustrates an example transmit / receive operation of the NCR when it relays between the base station and the UE, according to an embodiment.

[0224] refer to Figure 10 The NCR 1000 includes a network-controlled repeater-mobile terminal (NCR-MT) 1001 capable of sending and receiving control signaling from a base station, and a network-controlled repeater-forwarder (NCR-Fwd) 1002 for amplifying and transmitting downlink signals or amplifying and transmitting uplink signals according to the base station's control signaling. The NCR-MT 1001 can receive control signaling from the base station via a control link (C-link 1003) and can send feedback information to the base station. In other words, the NCR-MT 1001 can act as a regular terminal of the base station, and the base station can communicate with the NCR-MT 1001 accordingly. The base station can control the NCR-Fwd 1002 by sending control signaling to the NCR-MT 1001. The NCR-Fwd 1002 can process RF signals and / or physical layer signals, and can amplify downlink signals received from the base station and transmit the amplified downlink signals to the UE. In the downlink, the NCR-Fwd 1002 can receive signals from the base station via the backhaul link 1004 and then send signals to the UE via the access link 1005. Figure 10 In the diagram, backhaul link 1004 and C link 1003 are shown as separate links, but they may not necessarily be physically separate links. NCR 1001 can detect SCI from C link 1003, where SCI is configured to control the operation of NCR 1001 from the base station while simultaneously performing signal amplification and transmission.

[0225] The NCR 1001 can receive uplink signals sent by the UE through access link 1005, amplify the uplink signals, and transmit the amplified uplink signals to the base station through backhaul link 1004. In this configuration, the NCR 1001 can send uplink feedback or signals for SCI to the base station, or receive higher-layer signaling from the base station. The backhaul link 1004 can use a wired link or a wireless link. In the following text, the NCR may have the following characteristics: Figure 10 The same configuration as the example.

[0226] Figure 11 An example is shown whereby the NCR receives a beam indication for accessing a link from a base station, according to an embodiment.

[0227] refer to Figure 11The NCR can periodically / semi-statically / aperiodically receive beam indications for access links (hereinafter referred to as access link beam indications) from the base station via control signaling such as SCI 1100. The NCR can receive access link beam indication 1101 aperiodically from the base station. The NCR can detect and decode SCI 1100 including the access link beam indication to know the time resources corresponding to the access link beam index. The NCR can utilize the indicated time resources and beam index to perform signal amplification and transmission operations. The NCR can periodically or semi-statically receive access link beam indications 1102 and 1103 from the base station. Figure 11 This illustrates the scenario where the NCR periodically or semi-statically receives access link beam indications from the base station during each predetermined time slot. The NCR can receive higher-layer signaling (RRC or MAC-CE) from the base station and knows the beam index, time resources, and time period used for the access link beam. When the NCR receives the access link beam indication as described above, it performs signal amplification and transmission operations within the indicated access link beam and time resources. The NCR does not perform signal amplification and transmission operations in time periods other than those indicated by the access link beam indication. For example, NCR-Fwd 1002 performs signal amplification and transmission operations in the time slots or symbol portions of reference numerals 1101, 1102, and 1103, but not in other time slots or symbol portions. The time resources indicated by the access link beam indication can be called a forwarding window. A pair of {access link beam index, time resource} indicated by the access link beam indication can be called a forwarding resource.

[0228] According to an embodiment, Figure 12A This illustrates an example where the NCR receives an aperiodic access link beam indication from the base station, and Figure 12B This illustrates an example where the NCR applies the access link beam in the symbol portion of the corresponding time slot based on the aperiodic access link beam indication.

[0229] refer to Figure 12A The NCR can receive from the base station an SCI 1200 including an aperiodic access link beam indication for access link beam 1220. The aperiodic access link beam indication may include at least one beam field 1201 and at least one time field 1202 corresponding to the at least one beam field 1201. The beam field 1201 may indicate the beam index of at least one access link beam scheduled to the NCR, and in the at least one time field 1202, each time field may indicate the time resource scheduled to the corresponding access link beam index.

[0230] For example, when the NCR receives SCI 1200 as a DCI scrambled to the NCR-only RNTI, beam field 1201 may indicate at least one access link beam index, and time field 1202 may indicate the entry number (e.g., index) of at least one time resource in the time resource list. The base station may pre-provide the NCR with a time resource list including information about multiple time resources via higher-layer signaling such as RRC information, and each of the multiple time resources is mapped to an entry number in the time resource list. In this case, each time resource may include information about at least one of slot offset, symbol offset, and symbol duration.

[0231] refer to Figure 12B Slot offset 1211 indicates the offset from reference slot n+k to the slot where the applied access link beam is applied, where reference slot n+k is obtained by adding k, as described below, to slot n for NCR to receive SCI 1200. Slot offset 1211 is information different from the slot offset (K0) value indicating the slot where PDSCH data scheduled via PDCCH is received in the NR standard. NCR can identify the symbol portion of the symbols in the slot identified based on slot offset 1211 that applies the aperiodic access link beam based on symbol offset 1212 and symbol cell interval 1213. Each time resource may include SCS information, where the time resource is configured in the scheduled time slot. The number of beam fields 1201 is the same as the number of time fields 1202, and the quantity information can be configured / provided to NCR via higher-layer signaling. Figure 12A Since the time field 1202 comprises three fields, it can indicate three distinct portions (1222, 1223, and 1224) in the time domain. The NCR can apply the access link beam indicated by the SCI 1200 based on at least one of the slot offset, symbol offset, symbol cell interval, and SCS information.

[0232] Figure 13 This example illustrates the entire offset from the time slot when the NCR receives the aperiodic access link beam indication from the base station to the time slot when the access link beam is applied, according to an embodiment. The entire offset can be understood as taking into account both the k-value and the time slot offset.

[0233] refer to Figure 13The NCR can detect SCI 1300, including the aperiodic access link beam indication, and identify the time slot offset 1310 in the time resources indicated by the aperiodic access link beam indication. During the NCR capability negotiation process with the base station, the NCR can report a k value set to the base station based on at least one of DCI / SCI decoding time, beam application time, or inter-module handover time, or the base station can configure the k value. The k value can be set based on capability information about the NCR. The DCI / SCI decoding time can indicate, for example, the time required for the NCR to decode the SCI received via the DCI, and the beam application time can indicate the time required for the NCR to apply the beam according to the aperiodic access link beam indication. The inter-module handover time can indicate the time required to apply the operation of the NCR-Fwd 1002 based on control information received by the NCR-MT 1001, wherein the NCR-MT 1001 is a reference Figure 10 The module described in the NCR.

[0234] Based on the k value, the NCR can identify the access link beam application time slot 1313. Specifically, the NCR can determine the n+k time slot 1312 as the reference time slot and apply a time slot offset 1310 from the reference time slot, where the n+k time slot 1312 is obtained by adding the k value to the time slot n 1311 in which SCI 1300 is received. As a result of applying the time slot offset 1310, the NCR can determine the application time slot 1313 based on the application time slot offset 1310. Figure 12B The symbol offset and symbol cell spacing described in the text are used to identify the exact symbol portion of the access link beam to be applied in time slot 1313.

[0235] The SCI 1300 detected by the NCR can not explicitly transmit whether the access link beam is applied to the uplink or downlink. In this case, the NCR can determine the direction of the access link beam based on the uplink or downlink indicated by the higher-layer signaling tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated, which can be defined in the 3GPP standard.

[0236] First Embodiment

[0237] When the NCR receives an SCI including an aperiodic access link beam indication from the base station, the NCR can determine the n+k time slot 1312, obtained by adding k to the time slot n 1311 where the SCI is received, as the reference time slot, and apply a time slot offset 1310 from the reference time slot. The NCR's determination of the reference time slot may be ambiguous when the SCS of the PDCCH in which the SCI is transmitted differs from the SCS of the time resource for which the access link beam is applied. For example, when the SCS of the PDCCH is 15 kHz and the SCS of the time resource for which the access link beam is applied is 30 kHz, the position of the reference time slot n may be unclear because two 30 kHz time slots overlap with a 15 kHz time slot. The value of k can also be the same or different for each SCS. Therefore, the time position of the reference time slot corresponding to the n+k time slot 1312 can be different for each subcarrier.

[0238] Figure 14 An example is shown of the total offset for each different SCS indicated by the non-periodic access link beam received from the base station by the NCR according to an embodiment. The entire offset may be referred to simply as the offset.

[0239] refer to Figure 14 The NCR can determine the time position of the reference time slot for each SCS (which is shown as, for example, 15 kHz, 30 kHz, or 60 kHz), which varies for each SCS. For ease of description, in Figure 14 The code assumes that the slot offset (where the access link beam is applied) of the reference slots from the 15kHz, 30kHz, and 60kHz SCSs is 0. The NCR can receive SCI 1401 in slot n=0 of the 15kHz SCS and determine slot 2 as the reference slot 1410, where slot 2 is obtained by adding a value of k=2 to slot n=0 where the SCI is received. In this case, the access link beam 1402 of the 15kHz SCS with a slot offset of 0 can be applied to slot 2 according to k=2. The k value can be set / applied differently for each SCS. For example, the access link beam 1403 of the 30kHz SCS can be configured with k=3 as the k value and applied to slot 3. In this case, the reference slot is slot 3, and the access link beam 1403 of the 30kHz SCS with a slot offset of 0 can be applied to slot 3. Similarly, in the 60kHz SCS, it is assumed that time slots n=3 and k=6 are where the SCS is received, and that access link beam 1404 configured for the 60kHz SCS can be applied to time slot 6. Figure 14In this context, given an absolute time, access link beams 1403 and 1404 are applied within the reference time slot of a 15kHz SCS. In this regard, since the k value is set based on NCR capabilities (such as decoding time / beam application time / inter-module switching time), the NCR may not expect to apply the access link beams before the reference time slot. If the application of the NCR's access link beams can be applied independently regardless of the reference time slots of other SCSs, then the access link beams can be applied as in Case 1 1400. Independent application can indicate that signal amplification and transmission can be processed in parallel or simultaneously in SCSs with different NCR capabilities. If signal amplification and transmission cannot be processed in parallel or simultaneously in SCSs with different NCR capabilities, then the corresponding NCR may not perform the independent application as in the example of Case 1 1400. For example, the NCR can identify whether an independent application is performed by negotiating with the base station's capabilities.

[0240] and Figure 14 Unlike Case 1 (1400), in Case 2 (1420), due to physical factors or hardware limitations in the network (i.e., NCS capabilities), the NCR may not apply the access link beam independently, regardless of the reference time slots of other SCSs. Since the k value is determined based on, for example, decoding time / beam application time / inter-module switching time, the NCR may not be able to apply the access link beam without the time required for each SCS's decoding time / beam application time / inter-module switching time. For example, in... Figure 14 In Case 2, 1420, at the 15kHz SCS, access link beam 1402 can be applied in time slot 2, as in Case 1, 1400. Conversely, the NCR, which cannot be applied independently as in Case 2, 1420, can be applied in the 60kHz SCS without the reference time slot of the 15kHz SCS, and access link beam 1403 of Case 1, 1400 can be applied without the reference time slot of the 30kHz SCS. Figure 14 In the attached figure, reference numeral 1411 indicates that, according to Case 2 1420, the access link beam may not be applied to the time slot. In Case 2 1420, due to hardware limitations or physical factors, the NCR may apply the beam in different SCSs at a predetermined time after receiving the SCI. The NCR requires ensuring consistent preparation time when different SCSs are configured in the time resources.

[0241] In cases 1 (1400) and 2 (1420), time slot n needs to be clearly defined in different SCSs. Time slot n can correspond to at least one of 1) to 4) below.

[0242] 1) A first time slot overlapping with a time slot that includes a PDCCH, wherein the PDCCH includes / transmits the SCI.

[0243] 2) The last time slot that overlaps with a time slot that includes a PDCCH, where the PDCCH includes / transmits the SCI.

[0244] 3) The first time slot overlapping with the symbols of the PDCCH that include / transmit SCI.

[0245] 4) The last time slot that overlaps with the symbol of the PDCCH that includes / transmits SCI.

[0246] Figure 15 The following is illustrated according to an embodiment: Figure 14 Example of ensuring preparation time for NCR used in application access link beams in Case 2.

[0247] refer to Figure 15 Method 1 1500 can use at least one of the following methods 1-1, 1-2 and 1-3.

[0248] Method 1-1: Reference Figure 15 An example method for ensuring consistent readiness time between different SCSs in Case 2 1420 is to restrict scheduling. For example, the NCR may not expect to schedule the access link beam before reference time slot 1510 of the SCS in which the PDCCH including / transmitting the SCI is applied. When applying method 1-1, the NCR may not expect to apply the access link beam in time slot 5 where the SCS is 60 kHz.

[0249] Method 1-2: Alternatively, the NCR may not intend to schedule the access link beam before the reference time slot of the smallest SCS among at least one SCS configured in at least one time resource indicated by the SCI. When applying Method 1-2, the NCR may not intend to apply the access link beam in time slot 3 with an SCS of 30 kHz and time slots 5, 6, and 7 with an SCS of 60 kHz. Figure 15 In the above method 1-2, assuming an SCI is received in slot 0 with an SCS of 30 kHz, and the reference slots are slots 2, 3, and 5 with SCSs of 15 kHz, 30 kHz, and 60 kHz, the NCR may not expect to schedule the access link beam before the reference slot (i.e., slot 2) of the lowest 15 kHz SCS among the SCSs configured in the time resources indicated by the SCI. In the above method 1-2, reference numerals 1502, 1503, and 1504 illustrate examples of scheduling the access link beam after the reference slot (i.e., slot 2) with a 15 kHz SCS is applied in slots with SCSs of 15 kHz, 30 kHz, and 60 kHz.

[0250] Methods 1-3: Alternatively, the NCR may not expect to schedule access link beams before the reference time slot of the smallest SCS among the time resources configured in the time resource list included by the higher-layer signaling. When applying Methods 1-2, the NCR may not expect to apply access link beams in time slot 3 with an SCS of 30 kHz and in time slots 5, 6, and 7 with an SCS of 60 kHz. Figure 15 In the above method 1-2, assuming that an SCI is received in slot 0 with an SCS of 30 kHz and the reference slots are slots 2, 3, and 5 in slots with SCSs of 15 kHz, 30 kHz, and 60 kHz, the NCR may not expect to schedule the access link beam before the reference slot (i.e., slot 2) in the time resources configured in the time resource list included by the higher-layer signaling. Reference numerals 1502, 1503, and 1504 in the above method 1-2 illustrate examples of scheduling the access link beam after the reference slot (i.e., slot 2) in slots with SCSs of 15 kHz, 30 kHz, and 60 kHz, where the 15 kHz SCS is applied.

[0251] Used in Figure 14 Another example of ensuring consistent preparation time across different SCSs in Scenario 2.1420 is to sort the reference time slots. For example... Figure 15 Another example is provided as in Method 2 1520. Method 2 1520 described above is a method for determining the reference time slot of another SCS relative to the reference time slot of any SCS. Specifically, Method 2 may include at least one of Methods 2-1 to 2-8.

[0252] Method 2-1: NCR can determine the first time slot that overlaps with the reference time slot (time slot n+k) of the SCS including the PDCCH of SCI as the reference time slot. Alternatively, NCR can determine the time slot corresponding to the expression The time slot is determined as the reference time slot. PDCCH It is a time slot of PDCCH containing SCI, k PDCCH This is the k value corresponding to the SCS of the PDCCH (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u PDCCH It is the SCS of PDCCH. For example, in Figure 15In Method 2 1520, the reference time slot (time slot n+k) for the SCS of the PDCCH transmitting the SCI is time slot 4 with an SCS of 30 kHz, and the first time slot (reference time slot) overlapping with time slot 4 with an SCS of 30 kHz in the respective time slots with SCSs of 15 kHz and 60 kHz is time slot 2 and time slot 8, which are shown in shaded form. In Method 2-1 above, reference numerals 1521, 1522, and 1523 show an example of scheduling the access link beam after applying a reference time slot (i.e., time slot 2) with a 15 kHz SCS in each time slot with SCSs of 15 kHz, 30 kHz, and 60 kHz to determine the reference time slot with a consistent preparation time as determined above.

[0253] Method 2-2: NCR can determine the last time slot that overlaps with the reference time slot (time slot n+k) of the SCS transmitting the SCI PDCCH as the reference time slot. Alternatively, NCR can determine the time slot corresponding to the expression... The time slot is determined as the reference time slot. PDCCH It is a time slot of PDCCH containing SCI, k PDCCH This is the k value corresponding to the SCS of the PDCCH (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u PDCCH It is the SCS of PDCCH.

[0254] Method 2-3: NCR can determine the first time slot that overlaps with the reference time slot (time slot n+k) of the minimum SCS in the time resources indicated by SCI as the reference time slot. Alternatively, NCR can determine the time slot corresponding to the expression The time slot is determined as the reference time slot. minSCS It is the slot n,k corresponding to the smallest SCS among the SCS configured in the time resources indicated by SCI. minSCS It is the k value corresponding to the lowest SCS among the SCS configured in the time resources indicated by SCI (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the minimum SCS among the SCS configured in the time resources indicated by the SCI. For example, in Figure 15In the above, the reference time slot (slot n+k) of the smallest SCS in the time resources indicated by SCI is time slot 2 with an SCS of 15kHz, and the first time slots (reference time slots) that overlap with time slot 2 with an SCS of 15kHz in SCSs of 30kHz and 60kHz are time slots 4 and 8, which are shown in shaded areas. In methods 2-3 above, reference numerals 1521, 1522, and 1523 show an example of scheduling access link beams after applying the reference time slot (i.e., time slot 2) of the 15kHz SCS in SCSs of 15kHz, 30kHz, and 60kHz, with a consistent preparation time as determined above.

[0255] Method 2-4: NCR can determine the last time slot that overlaps with the reference time slot (time slot n+k) of the minimum SCS in the time resources indicated by SCI as the reference time slot. Alternatively, NCR can determine the time slot corresponding to the expression The time slot is determined as the reference time slot. minSCS It is the slot n,k corresponding to the lowest SCS among the SCS configured in the time resources indicated by SCI. minSCS It is the k value corresponding to the lowest SCS among the SCS configured in the time resources indicated by SCI (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the lowest SCS among the SCS configured in the time resources indicated by SCI.

[0256] Method 2-5: Method 2-3 may not know the reference time slot before decoding the SCI. To know the reference time slot before decoding the SCI, the NCR can determine the first time slot that overlaps with the reference time slot (slot n+k) of the lowest SCS among the time resources included in the time resource list configured by higher-layer signaling as the reference time slot. Alternatively, the NCR can determine the reference time slot corresponding to the expression... The time slot is determined as the reference time slot. minSCS It is the slot n,k corresponding to the lowest SCS among the time resources included in the time resource list configured by higher-level signaling. minSCS It is the k value corresponding to the lowest SCS among the time resources included in the time resource list configured by higher-level signaling (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the lowest SCS among the time resources included in the time resource list configured by higher-level signaling.

[0257] Method 2-6: Method 2-3 may not know the reference time slot before decoding the SCI. To know the reference time slot before decoding the SCI, the NCR can determine the first time slot that overlaps with the reference time slot (time slot n+k) of the time resources included in the time resource list configured by higher-layer signaling and the lowest SCS in the PDCCH transmitting the SCI as the reference time slot. Alternatively, the NCR can determine the reference time slot corresponding to the expression The time slot is determined as the reference time slot. minSCS It is the slot n,k corresponding to the lowest SCS in the time resource list included in the time resource list configured by higher-layer signaling and the PDCCH for transmitting SCI. minSCS It is the k value corresponding to the lowest SCS in the time resource list configured by higher-level signaling and the PDCCH including SCI (unless it changes according to SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the lowest SCS included in the time resource list configured by higher-level signaling and in the PDCCH that includes SCI.

[0258] Method 2-7: Method 2-4 may not know the reference slot before decoding the SCI. To be aware of this, the NCR can determine the last slot that overlaps with the reference slot (slot n+k) of the lowest SCS included in the time resource list configured by higher-layer signaling as the reference slot. Alternatively, the NCR can use the slot corresponding to the expression The time slot is determined as the reference time slot. minSCS It is the slot n,k corresponding to the lowest SCS among the time resources included in the time resource list configured by higher-level signaling. minSCS It is the k value corresponding to the lowest SCS among the time resources included in the time resource list configured by higher-level signaling (unless it changes according to the SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the lowest SCS among the time resources included in the time resource list configured by higher-level signaling.

[0259] Method 2-8: Method 2-4 may not know the reference slot before decoding the SCI. To be aware of this, the NCR can determine the last slot that overlaps with the reference slot (slot n+k) of the time resource included in the time resource list configured by higher-layer signaling and the lowest SCS in the PDCCH including the SCI as the reference slot. Alternatively, the NCR can use the slot corresponding to the expression The time slot is determined as the reference time slot. minSCSIt is the slot n,k corresponding to the time resources included in the time resource list configured by higher-level signaling and the lowest SCS in the PDCCH including SCI. minSCS It is the k value corresponding to the lowest SCS in the time resource list included in the higher-level signaling configuration and the PDCCH including SCI (unless it changes according to SCS, the k value is used as is), u beam It is the SCS of the access link beam of the application, and u minSCS It is the time resource included in the time resource list configured by higher-level signaling and the lowest SCS in the PDCCH including SCI.

[0260] Figure 16 A method for determining the overall offset of the access link beam in an NCR of a wireless communication system according to an embodiment is shown.

[0261] refer to Figure 16 In step 1601, the NCR can detect an SCI scrambled with an NCR-specific RNTI in the downlink control channel. The SCI may include an aperiodic access link beam indication, which may include at least one beam field and at least one time field (time information) corresponding to the at least one beam field (beam information). The beam field (beam information) may indicate the beam index of at least one access link beam scheduled to the NCR, and in the at least one time field, each time may indicate the time resource index scheduled to the corresponding access link beam. The base station may provide the NCR with information about multiple time resources in advance via higher-layer signaling such as RRC information, and each of the multiple time resources is mapped to an entry number. Each time resource may include information about at least one of slot offset, symbol offset, and symbol duration. Further, each time resource may include SCS information, wherein the time resource is configured in a scheduling slot.

[0262] In step 1602, within the detected SCIs, the NCR can determine / identify a reference timeslot for each SCS. In step 1602, the NCR can determine / identify the reference timeslot for each SCS with different SCSs using either method 1 or method 2 described above. During the NCR capability negotiation process with the base station, the NCR can report a k value to the base station via higher-layer signaling such as RRC information, or configure the k value from the base station, wherein the k value is set based on at least one of DCI / SCI decoding time, beam application time, and inter-module handover time. The k value can be set based on capability information about the NCR. The timeslot offset indicates the offset from the reference timeslot n+k to the timeslot in which the access link beam is applied, wherein the reference timeslot n+k is obtained by adding k to the timeslot n in which the NCR receives the SCI.

[0263] In step 1602, the NCR may determine the first time slot that overlaps with the reference time slot (time slot n+k) of the SCS that includes the SCI in the PDCCH as the reference time slot. Alternatively, the NCR may determine the last time slot that overlaps with the reference time slot (time slot n+k) of the SCS that transmits the SCI in the PDCCH as the reference time slot. Alternatively, the NCR may determine the first time slot that overlaps with the reference time slot (time slot n+k) of the lowest SCS in the time resources indicated by the SCI as the reference time slot. Alternatively, the NCR may determine the last time slot that overlaps with the reference time slot (time slot n+k) of the lowest SCS in the time resources indicated by the SCI as the reference time slot. Alternatively, the NCR may determine the first time slot that overlaps with the reference time slot (time slot n+k) of the lowest SCS among the SCSs included in the time resource list as the reference time slot. Alternatively, the NCR may determine the last time slot that overlaps with the reference time slot (time slot n+k) of the lowest SCS among the SCSs included in the time resource list of time resources as the reference time slot. Alternatively, the NCR may determine the first time slot that overlaps with the reference time slot (time slot n+k) of the lowest SCS among the SCSs including the PDCCH of the SCI and the SCSs included in the time resource list of time resources as the reference time slot. Alternatively, the NCR may determine the last time slot that overlaps with the reference time slot (time slot n+k) of the SCSs including the PDCCH of the SCI and the lowest SCS among the SCSs included in the time resource list of time resources as the reference time slot. Alternatively, the NCR may not expect to schedule access link beams in other SCSs before applying the reference time slot of the lowest SCS among the SCSs configured in the time resource indicated by the SCI. Alternatively, the NCR may not expect to schedule access link beams in other SCSs before applying the reference time slot of the lowest SCS among the SCSs configured in the time resource included in the time resource list of time resources. Alternatively, the NCR can apply the access link beam independently for each SCS, regardless of the reference timeslot in different SCSs when applying the access link beam.

[0264] After determining / identifying the reference time slot, in step 1603, the NCR can perform access link beaming application. The NCR can identify the symbol portion of the symbols in the time slot identified based on the time slot offset to which the aperiodic access link beaming is applied, based on the symbol offset and symbol cell spacing.

[0265] Second Embodiment

[0266] When the NCR receives an aperiodic access link beam indication via the SCI, the time slot offset value included in the time resource indicated by the NCR can be as high as 14. In other words, the NCR can apply access link beams based on access link beam indications from a reference time slot to up to 14 time slots. The maximum 14 time slots can include time slots that use each other's SCS. However, if all SCSs share the same maximum value as the time slot offset, the absolute time for scheduling each SCS can be reduced. The second embodiment provides a solution to this situation. A time slot with an SCS of A kHz will be referred to as an A kHz time slot.

[0267] Figure 17 An example is shown where the NCR uses the same maximum slot offset for slots using different SCSs, according to an embodiment.

[0268] refer to Figure 17 The NCR can receive access link beams with slot offsets 1, 2, 5, 6, and 13 for a 15 kHz SCS and access link beams with slot offsets 6, 7, 8, and 14 for a 30 kHz SCS within a single SCI 1701. When the maximum slot offset is 14, slot offsets exceeding 14 can be omitted in the 30 kHz SCS; therefore, the corresponding slots (slots 15 to 29) can be considered slot 1711 where aperiodic access link beams can be left unscheduled. In this case, in slots with slot offsets less than 14 at SCS 60 kHz, all other SCSs already occupy time resources, making scheduling potentially impossible. Since the slot offset at SCS 60 kHz may not exceed 14, additional SCI indications are needed to schedule the aperiodic access link beams at SCS 60 kHz. Figure 17 As shown, when all different subcarrier spacings (SCS) share the same time slot offset, there may be limitations in indicating access link beams.

[0269] One way to solve the above problem is to set a slot offset with a fixed reference for each SCS (Method 3). Method 3 can use at least one of the following methods 3-1 to 3-4.

[0270] Method 3-1: The time slot offset can be set for each SCS. For example, the maximum time slot offset for SCS 15kHz is defined as 14, and the maximum time slot offset for SCSs higher than 15kHz can increase proportionally to the SCS value. For example, the maximum time slot offset for SCS 15kHz can have a value of 14, the maximum time slot offset for SCS 30kHz can have a value of 28, the maximum time slot offset for SCS 60kHz can have a value of 56, and the maximum time slot offset for SCS 120kHz can have a value of 112.

[0271] Method 3-2: The time slot offset reference for each SCS can be set to the time slot offset of the SCS 15kHz. For example, when the time slot offset of the NCR is set to 14 via the SCI and indicated as a 30kHz SCS, the first or last time slot in the SCS 30kHz time slot (hereinafter referred to as the 15kHz time slot) that overlaps with the SCS 15kHz time slot (hereinafter referred to as the 15kHz time slot) can be identified as the location where the access link beam is applied.

[0272] Method 3-3: Since Method 3-2 only uses the first or last time slot among those overlapping with the 15kHz time slot, scheduling may be limited. Additional settings can mitigate these limitations. For example, if the additional setting value for the time slot offset is 0, the time slot in which the access link beam is applied can be identified as the first time slot among those overlapping with the 15kHz time slot, and if it is 1, it can be identified as the second time slot among those overlapping with the SCS 15kHz time slot.

[0273] Method 3-4: Since Method 3-2 only uses the first or last time slot among those overlapping with SCS 15kHz, scheduling can be restricted. In this case, scheduling restrictions can be mitigated by repeating the setting. The NCR can repeat the access link beam indication in all time slots overlapping with SCS 15kHz. For example, the access link beam indication time resource applied in the first time slot overlapping with SCS 15kHz can be repeated until the last time slot.

[0274] Another approach to addressing the limitations of the access link beam can be to interpret the SCS time slot offset differently according to the standard (Method 4). Specifically, Method 4 can employ at least one of Methods 4-1 to 4-7 described below.

[0275] Method 4-1: The time slot offset can be set based on the lowest SCS among the set SCSs. For example, if the lowest SCS among the SCSs included in the time resources indicated by the NCR via the SCI is 30kHz, the NCR can identify the first or last time slot among the time slots of other SCSs that overlap with the 30kHz time slot as the time slot in which the access link beam is applied.

[0276] Method 4-2: Method 4-1 only uses the first or last time slot among other SCSs (where the lowest SCS among the configured SCSs overlaps with the set time slot), thus scheduling may be limited. The scheduling limitations can be mitigated if an additional setting for time slot offset is present. For example, if the additional setting value for time slot offset is 0, the time slot where the access link beam is applied can be understood as the first time slot among those overlapping with the 15kHz time slot, and if it is 1, it can be understood as the second time slot.

[0277] Method 4-3: Method 4-1 uses only the first or last time slot among those time slots that overlap with the time slot configured with the lowest SCS, as the time slot for which the access link beam is applied, thus scheduling may be limited. In this case, scheduling limitations can be mitigated by repeating the setting. The NCR can repeat the access link beam indication in all time slots that overlap with the time slot configured with the lowest SCS. For example, the time resources for the access link beam indication applied in the first time slot that overlaps with the 15kHz time slot can be repeated until the last time slot.

[0278] Method 4-4: Slot offsets can be identified based on the SCS of the PDCCH transmitting the SCI. For example, if the SCS of the PDCCH transmitting the SCI indicated to the NCR is 30kHz, then the first or last slot overlapping with the 30kHz slot can be referred to as the slot in which the access link beam is applied.

[0279] Method 4-5: Method 4-4 uses only the first or last time slot among those time slots overlapping with the time slot where the PDCCH transmitting the SCI is received as the time slot where the access link beam is applied, thus scheduling may be limited. Additional settings can mitigate these limitations. For example, if the additional setting value for the time slot offset is 0, the time slot where the access link beam is applied can be understood as the first time slot among those overlapping with the 15kHz time slot. If the time slot offset is 1, it can be understood as the second time slot.

[0280] Method 4-6: Method 4-4 uses only the first or last time slot among those overlapping with the time slot where the PDCCH transmitting the SCI is received as the time slot for applying the access link beam, thus scheduling may be limited. In this case, scheduling limitations can be mitigated by repeating the setting. The NCR can repeat the access link beam indication in all overlapping time slots. For example, the access link beam indication time resource applied in the first time slot among those overlapping with the 15kHz time slot can be repeated until the last time slot.

[0281] Method 4-7: The access link beam indication can be repeated at each predetermined time interval within the search period of the PDCCH in which the SCI is transmitted. For example, suppose the search period of the PDCCH in which the SCI is transmitted is 30 time slots, the SCS is 15 kHz, and the access link beam indication is repeated every 14 time slots. In this case, the access link beam indication can be repeated twice in the 15 kHz time slot and four times in the 30 kHz time slot. The repetition can indicate that the indicated time resources up to the 14th time slot are repeated using only the time slot offset as the reference time slot.

[0282] Third Embodiment

[0283] When the NCR receives an aperiodic access link beam indication via the SCI, the NCR can receive time resource indications through different fields in the SCI. The number of time resource fields can be set to higher-layer signaling, and each time resource field can indicate an entry containing a list of information about multiple time resources. The entry indication is related to... Figure 12A The access link beam index shown corresponds to the entry number (e.g., index) of the time resource, and the list information can be provided to the NCR via higher-level signaling such as RRC information. Therefore, the bit width of the time resource field can vary depending on the number of entries. In this case, the operation of the NCR may become ambiguous when the time resources indicated in different fields overlap in the same symbol, and when the access link beams corresponding to the fields are different from each other.

[0284] Figure 18 An example is shown where different time resources of the NCR overlap in the same symbol according to an embodiment.

[0285] refer to Figure 18The NCR receives access link beams via at least one time resource field 1802, 1803, and 1804 in SCI 1800 and at least one access link beam index field 1801. The NCR can be instructed to apply access link beams in time slots 1 and 2 via the first time resource field 1802, in time slot 2 via the second time resource field 1803, and in time slots 2, 3, and 4 via the third time resource field 1804. In this case, different access link beams overlap in at least one symbol in time slot 2, as indicated by reference numeral 1810. In this situation, since the agreed-upon operation is not defined, the NCR can arbitrarily choose the application of the access link beams, and this choice may not match the access link beam indication expected by the base station. To prevent this, the NCR may not expect different time resources corresponding to different access link beams to overlap in the same symbol. However, to increase scheduling flexibility within a limited number of time resource fields, it is necessary to apply access link beams according to priority when overlap occurs. As shown in Figure 1820, if the access link beam is applied in a manner that does not overlap in the same symbol with different time resources depending on priority, the access link beam changes four times. However, it is possible to indicate the application of a stable access link beam through three time resource fields.

[0286] If NCR is configured in relation to SCI time resource priorities via higher-level signaling (e.g., RRC or MAC-CE), time resource field priorities can be specified based on the order of the time resource field, SCS, or slot offset. For example, time resource fields can be prioritized in ascending or descending order of their indexes. As another example, time resource field priorities can be determined in such a way that the time resource field with the largest SCS has the highest priority, and the time resource field with the next largest SCS has the next highest priority. As yet another example, time resource fields with larger slot offsets included in the time resources can be prioritized. If the slot offsets are the same, the sign offsets can be compared, giving priority to the time resource field with the larger sign offset. Additional fields in the SCI can indicate which time resource takes precedence. The examples above for determining priorities are not mutually exclusive but can be combined.

[0287] In this way, NCR can clearly identify the reference time slot in the time domain based on the indication information provided by SCI in the wireless communication system, and stably perform amplification and transmission operations at the indicated time under the control of the base station.

[0288] Figure 19 The structure of a UE in a wireless communication system according to an embodiment is shown.

[0289] refer to Figure 19 The UE may include a UE receiver 1905, a UE transmitter 1910, and a UE processor (controller) 1900.

[0290] For example, the NCR relayed between the UE and the base station is identified as the UE by the base station. Therefore, in this case, Figure 19 The UE can be an NCR. For example, an NCR can include a receiver, a transmitter, and a processor (controller). The receiver, transmitter, and processor (controller) correspond to... Figure 19 The UE receiver 1905, UE transmitter 1910, and UE processor (controller) 1900 are included.

[0291] UE receiver 1905 and UE transmitter 1910 can be collectively referred to as transceivers. According to the UE communication method described above, UE receiver 1905, UE transmitter 1910, and UE processor 1900 can operate the UE. However, the components of the UE are not limited to this. For example, the UE may include more components (e.g., memory) or fewer components than those described above. UE receiver 1905, UE transmitter 1910, and UE processor 1900 can be implemented as a single chip.

[0292] UE receiver 1905 and UE transmitter 1910 (or transceiver) can transmit signals to / receive signals from a base station. The signals may include control information and data. For this purpose, the transceiver may include a radio frequency (RF) transmitter for up-converting and amplifying the transmitted signal and an RF receiver for low-noise amplification and down-converting the received signal. However, this is merely an example of a transceiver, and the components of the transceiver are not limited to RF transmitters and RF receivers. UE receiver 1905 and UE transmitter 1910 (or transceiver) may include a communication interface for transmitting / receiving with a base station via a wired or wireless backhaul link.

[0293] The transceiver can receive signals via a radio channel (or wired / wireless backhaul link) and output them to the UE processor 1900, and transmit signals output from the UE processor 1900 via a radio channel (or wired / wireless backhaul link). The transceiver 1110 can be referred to as a transmit / receive unit.

[0294] The memory can store programs and data necessary for the operation of the UE. The memory can store control information or data included in signals received by the UE. The memory can include storage media such as read-only memory (ROM), random access memory (RAM), hard disk, disc-ROM, and DVD, or a combination of storage media.

[0295] The UE processor 1900 can control a series of processes for the UE to operate according to the embodiments described above. The UE processor 1900 can be implemented as a controller or one or more processors.

[0296] Figure 20 The structure of a base station in a wireless communication system according to an embodiment is shown.

[0297] refer to Figure 20 The base station may include a base station receiver 2005, a base station transmitter 2010, and a base station processor (controller) 2000.

[0298] For example, as mentioned above, the NCR relaying between the UE and the base station is identified as the base station by the UE. Therefore, in this case, Figure 20 The base station can be an NCR. For example, an NCR can include a receiver, a transmitter, and a processor (controller).

[0299] Base station receiver 2005 and base station transmitter 2010 can be collectively referred to as transceivers. According to the base station communication method described above, base station receiver 2005, base station transmitter 2010, and base station processor 2000 can operate a base station. However, the components of a base station are not limited to these. For example, a base station may include more components (e.g., memory) or fewer components than those described above. Base station receiver 2005, base station transmitter 2010, and base station processor 2000 can be implemented as a single chip.

[0300] Base station receiver 2005 and base station transmitter 2010 (or transceiver) can transmit signals to / receive signals from the UE. The signals may include control information and data. For this purpose, the transceiver may include a radio frequency (RF) transmitter for up-converting and amplifying the transmitted signal and an RF receiver for low-noise amplification and down-converting the received signal. However, this is merely an example of a transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver. Base station receiver 2005 and base station transmitter 2010 (or transceiver) may include a communication interface for transmitting / receiving with the NCR via a wired or wireless backhaul link.

[0301] The transceiver can receive signals via a radio channel (or wired / wireless backhaul link) and output them to the base station processor 2000, and transmit signals output from the base station processor 2000 via a radio channel (or wired / wireless backhaul link). The transceiver 1110 can be referred to as a transmit / receive unit.

[0302] The memory can store programs and data necessary for the operation of the base station. The memory can store control information or data included in signals acquired by the base station. The memory can include storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media.

[0303] The base station processor 2000 can control a series of processes for the base station to operate according to the embodiments not described above. The base station processor 2000 can be implemented as a controller or one or more processors.

[0304] The boxes and combinations of flowcharts in each flowchart can be executed by computer program instructions. Since the computer program instructions can be located in the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus, the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for performing the functions described in conjunction with the boxes (or more) of each flowchart. Since the computer program instructions can be stored in a computer-usable or computer-readable storage device that can be directed to a computer or other programmable data processing apparatus to implement the functions in a specified manner, the instructions stored in the computer-usable or computer-readable storage device can produce a product including instructions for performing the functions described in conjunction with the boxes (or more) of each flowchart. Since the computer program instructions can be located in a computer or other programmable data processing apparatus, the instructions executed on the computer or other programmable data processing apparatus to generate a process executed by the computer as a series of operational steps and to operate the computer or other programmable data processing apparatus can provide steps for performing the functions described in conjunction with the boxes (or more) of each flowchart.

[0305] Each box may represent a module, segment, or portion of code comprising one or more executable instructions for performing a specified logical function (or more). Furthermore, in some alternative embodiments, the functions mentioned in the boxes may occur in a different order. For example, two boxes shown consecutively may depend on whether the corresponding functions are executed substantially simultaneously or in reverse order.

[0306] Although this disclosure has been shown and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a network-controlled repeater (NCR) of a relay signal in a wireless communication system, the method comprising: Identify at least one reference time slot for which the aperiodic access link beam is applied for each different subcarrier spacing (SCS); and The aperiodic access link beam is applied based on the at least one reference time slot and time slot offset.

2. The method according to claim 1, further comprising: Control information is received from the base station, including indications about the aperiodic access link beam to be applied in the NCR used for relay signals.

3. The method according to claim 2, wherein, The indication information includes at least one beam information and at least one time information corresponding to the at least one beam information. Wherein, the at least one beam information indicates at least one beam index of at least one access link beam scheduled to the NCR, and Each of the at least one time information indicates the time resources scheduled to the corresponding access link beam index.

4. The method according to claim 3, further comprising: Receive a list of multiple time resources, including the aforementioned time resources, from the base station via higher-layer signaling. Each of the plurality of time resources includes at least one of slot offset, symbol offset, symbol duration, and SCS information.

5. The method according to claim 3, wherein, The time slot offset indicates the offset from the reference time slot (n+k) to the time slot where the aperiodic access link beam is applied. The reference time slot (n+k) is obtained by adding a value k based on NCR capability information to the time slot n that has already received the indication information. Specifically, NCR identifies the duration of the symbol applied to the aperiodic access link beam within the symbols in the time slot identified by the time slot offset, based on symbol offset and symbol cell interval.

6. The method according to claim 1, wherein, The at least one reference time slot for each different SCS is determined to be one of the first and last time slots that overlap with the reference time slots of the SCS configured for the downlink control channel.

7. The method according to claim 1, wherein, For each different SCS, the at least one reference time slot is set to be one of the first and last time slots that overlaps with the reference time slot of the smallest SCS among the time resources indicated by the indication information.

8. The method according to claim 4, wherein, For each different SCS, the at least one reference time slot is set to overlap with one of the first and last time slots based on the reference time slot of the smallest SCS included in the list information, or Specifically, the at least one reference time slot for each different SCS is set to overlap with one of the first and last time slots of the reference time slot of the SCS based on the smallest SCS included in the list information and the physical downlink control channel (PDCCH) carrying downlink control information.

9. A network control repeater (NCR) for relaying signals in a wireless communication system, the NCR comprising: transceiver; and The processor is configured as follows: Identify at least one reference time slot applied to the aperiodic access link beam for each different subcarrier spacing (SCS), and The aperiodic access link beam is applied based on the at least one reference time slot and time slot offset.

10. The NCR according to claim 9, wherein, The processor is also configured to receive control information from the base station via a transceiver, the control information including indication information about aperiodic access link beams to be applied in the NCR used for relay signals.

11. The NCR according to claim 10, wherein, The indication information includes at least one beam information and at least one time information corresponding to the at least one beam information. Wherein, the at least one beam information indicates at least one beam index of at least one access link beam scheduled to the NCR, and Each of the at least one time information indicates the time resources scheduled to the corresponding access link beam index.

12. The NCR according to claim 11, wherein, The processor is also configured to receive, via transceiver and higher-layer signaling, from the base station a list of multiple time resources including the time resources. Each of the plurality of time resources includes at least one of slot offset, symbol offset, symbol duration, and SCS information.

13. The NCR according to claim 11, wherein, The time slot offset indicates the offset from the reference time slot (n+k) to the time slot where the aperiodic access link beam is applied. The reference time slot (n+k) is obtained by adding a value k based on NCR capability information to the time slot n that has already received the indication information. Specifically, NCR identifies the duration of the symbol applied to the aperiodic access link beam within the symbols in the time slot identified by the time slot offset, based on symbol offset and symbol cell interval.

14. The NCR according to claim 10, wherein, The at least one reference time slot for each different SCS is determined to be one of the first and last time slots that overlap with the reference time slots of the SCS configured for the downlink control channel.

15. The NCR according to claim 12, wherein, For each different SCS, the at least one reference time slot is set to overlap with one of the first and last time slots of the reference time slot of the smallest SCS among the time resources indicated by the indication information. Wherein, the at least one reference time slot for each different SCS is set to one of the first and last time slots overlapping with the reference time slot based on the smallest SCS included in the list information, or Specifically, the at least one reference time slot for each different SCS is set to overlap with one of the first and last time slots of the reference time slot of the SCS based on the smallest SCS included in the list information and the physical downlink control channel (PDCCH) carrying downlink control information.

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