Method and apparatus for measuring signal for subband bidirectional communication in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment in a wireless communication system comprises the steps of: receiving system information comprising a subband full duplex (SBFD) resource configuration and a random access configuration; establishing a radio resource control (RRC) connection on the basis of the SBFD resource configuration and the random access configuration; receiving an RRC message comprising at least one of a radio link monitoring (RLM)-related configuration for SBFD and a radio resource management (RRM)-related configuration for SBFD; and performing RLM measurement on the basis of the RLM-related configuration for SBFD or performing RRM measurement on the basis of the RRM-related configuration for SBFD.

Description

Method and apparatus for measuring a signal for partial-band bidirectional communication in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for measuring a signal for partial-band bidirectional communication in a wireless communication system.

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

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

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

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

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

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

[0008] As wireless communication technology advances, there is a need to define a method for a terminal to perform CSI-RS-based measurement operations, such as Radio Link Monitoring (RLM) and Radio Resource Management (RRM), in a cell where conditional subband full duplex (SBFD) communication is configured.

[0009] According to one embodiment of the present disclosure, a method is provided to be performed by a terminal of a wireless communication system. The method comprises: receiving system information including a subband full duplex (SBFD) resource setting and a random access setting; establishing a radio resource control (RRC) connection based on the SBFD resource setting and the random access setting; receiving an RRC message including at least one of a radio link monitoring (RLM) setting for SBFD and a radio resource management (RRM) setting for SBFD; and performing an RLM measurement based on the RLM setting for SBFD or performing an RRM measurement based on the RRM setting for SBFD.

[0010] According to one embodiment of the present disclosure, a terminal of a wireless communication system is provided. The terminal includes a transceiver and a control unit coupled to the transceiver. The control unit is configured to receive system information including SBFD resource settings and random access settings through the transceiver, establish an RRC connection based on the SBFD resource settings and the random access settings, receive an RRC message through the transceiver that includes at least one of an RLM-related setting for SBFD and an RRM-related setting for SBFD, and perform an RLM measurement based on the RLM-related setting for SBFD or perform an RRM measurement based on the RRM-related setting for SBFD.

[0011] According to various embodiments of the present disclosure, as the terminal performs beam-based measurement operations through SBFD resources in a cell supporting SBFD, beam failure operations in SBFD and / or handover operations to a neighboring cell supporting SBFD can be more efficiently supported.

[0012] Figure 1 is a diagram illustrating the structure of a next-generation mobile communication system.

[0013] Figure 2 is a diagram illustrating the wireless protocol structure of a next-generation mobile communication system.

[0014] FIG. 3 is a drawing for explaining the concept of an SBFD of a base station or cell according to one embodiment of the present disclosure.

[0015] FIG. 4 is a diagram illustrating cross-link interference of SBFD cells according to one embodiment of the present disclosure.

[0016] FIG. 5 is a diagram illustrating a procedure for a terminal to perform a Layer 1 channel measurement for SBFD in a cell that supports SBFD, according to one embodiment of the present disclosure.

[0017] FIG. 6 is a diagram illustrating the structure of a BFR MAC CE used in BFD and BFR procedures in an SBFD resource according to one embodiment of the present disclosure.

[0018] FIG. 7 is a diagram illustrating the operation of a terminal that performs RLM measurement and BFD / BFR operation using SBFD resources according to one embodiment of the present disclosure.

[0019] FIG. 8 is a diagram illustrating the operation of a terminal that performs RRM measurement and reporting operations using SBFD resources according to one embodiment of the present disclosure.

[0020] FIG. 9 is a drawing illustrating base station operation according to one embodiment of the present disclosure.

[0021] FIG. 10 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0022] FIG. 11 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0023] The operating principle of the present invention will be described in detail below with reference to the attached drawings. In describing the present invention below, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, such definitions should be based on the content throughout this specification. Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are provided as examples for the convenience of explanation. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0024] For convenience of explanation below, the present invention uses terms and names defined in the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) standard. However, the present invention is not limited by the above terms and names and can be applied in the same way to systems conforming to other standards.

[0025] Figure 1 is a diagram illustrating the structure of a next-generation mobile communication system.

[0026] Referring to FIG. 1, as illustrated, the wireless access network of a next-generation mobile communication system consists of a next-generation base station (New Radio Node B, hereinafter NR NB or NR gNB, 1-10) and an NR CN (New Radio Core Network, or NG CN: Next Generation Core Network, 1-05). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal, 1-15) connects to an external network through the NR NB (1-10) and the NR CN (1-05).

[0027] In FIG. 1, the NR NB (1-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR NB is connected to the NR UE (1-15) via wireless access (1-20) and can provide superior service compared to the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device is required to collect status information such as the buffer status, available transmission power status, and channel status of the UEs and perform scheduling, and this is handled by the NR NB (1-10). A single NR NB typically controls multiple cells. To achieve ultra-high-speed data transmission compared to existing LTE, it can have a maximum bandwidth greater than the existing maximum bandwidth, and additionally, beamforming technology can be incorporated by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as the wireless access technology. In addition, an Adaptive Modulation & Coding (AMC) method is applied to determine the modulation scheme and channel coding rate according to the channel conditions of the terminal. The NR CN (1-05) performs functions such as mobility support, bearer configuration, and QoS configuration. The NR CN is a device responsible for various control functions as well as mobility management functions for the terminal, and is connected to multiple base stations. Furthermore, the next-generation mobile communication system can be interoperable with existing LTE systems, and the NR CN is connected to the MME (1-25) via a network interface. The MME is connected to the existing base station eNB (1-30).

[0028] Figure 2 is a diagram illustrating the wireless protocol structure of a next-generation mobile communication system.

[0029] Referring to FIG. 2, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (2-01, 2-45), NR PDCP (2-05, 2-40), NR RLC (2-10, 2-35), and NR MAC (2-15, 2-30) at the terminal and the NR base station, respectively.

[0030] The main functions of NR SDAP (2-01, 2-45) may include some of the following functions.

[0031] - User data transfer function (transfer of user plane data)

[0032] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0033] - Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0034] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0035] Regarding the SDAP layer device, the terminal may receive a setting via an RRC message indicating whether to use the header of the SDAP layer device or the functions of the SDAP layer device for each PDCP layer device, bearer, or logical channel. If the SDAP header is configured, the terminal may be instructed to update or reset the mapping information for the QoS flow of the uplink and downlink and the data bearer using the NAS reflective QoS and AS reflective QoS 1-bit indicators of the SDAP header. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used for data processing priority, scheduling information, etc., to support smooth service.

[0036] The main functions of NR PDCP (2-05, 2-40) may include some of the following functions.

[0037] ● Header compression and decompression features (ROHC only)

[0038] ● User data transfer function (Transfer of user data)

[0039] ● Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0040] ● Out-of-sequence delivery of upper layer PDUs

[0041] ● Reordering function (PDCP PDU reordering for reception)

[0042] ● Duplicate detection function (Duplicate detection of lower layer SDUs)

[0043] ● Retransmission of PDCP SDUs

[0044] ● Encryption and decryption functions (Ciphering and deciphering)

[0045] ● Timer-based SDU discard in uplink.

[0046] In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on the PDCP SN (sequence number), and may include a function of transmitting data to an upper layer in the reordered order, or a function of transmitting immediately without considering the order, may include a function of recording lost PDCP PDUs by reordering, may include a function of reporting the status of lost PDCP PDUs to the transmitting side, and may include a function of requesting retransmission of lost PDCP PDUs.

[0047] The main functions of NR RLC(2-10, 2-35) may include some of the following functions.

[0048] ● Data transfer function (Transfer of upper layer PDUs)

[0049] ● Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0050] ● Out-of-sequence delivery of upper layer PDUs

[0051] ● ARQ Function (Error Correction through ARQ)

[0052] ● Concatenation, segmentation, and reassembly functions of RLC SDUs

[0053] ● Re-segmentation of RLC data PDUs

[0054] ● Reordering function (Reordering of RLC data PDUs)

[0055] ● Duplicate detection

[0056] ● Error detection function (Protocol error detection)

[0057] ● RLC SDU discard function

[0058] ● RLC re-establishment function

[0059] In the above, the in-sequence delivery function of the NR RLC device refers to the function of delivering RLC SDUs received from a lower layer to an upper layer in sequence; it may include a function to reassemble and deliver them if a single RLC SDU is received divided into multiple RLC SDUs; it may include a function to rearrange received RLC PDUs based on an RLC SN (sequence number) or PDCP SN (sequence number); it may include a function to record lost RLC PDUs after rearranging the order; it may include a function to report the status of lost RLC PDUs to the transmitting side; it may include a function to request retransmission of lost RLC PDUs; if there are lost RLC SDUs, it may include a function to deliver only the RLC SDUs prior to the lost RLC SDU to the upper layer in sequence; or if a predetermined timer has expired even if there are lost RLC SDUs, it may include a function to deliver all RLC SDUs received before the timer started to the upper layer in sequence; or It may include a function that delivers all RLC SDUs received up to the present to the upper layer in order once a predetermined timer has expired, even if there are lost RLC SDUs. Additionally, the RLC PDUs mentioned above may be processed in the order they are received (regardless of the order of sequence numbers, but in the order of arrival) and delivered to the PDCP device out of order (out-of-sequence delivery). In the case of segments, segments stored in a buffer or to be received later may be received, reconstructed into a single complete RLC PDU, processed, and then delivered to the PDCP device.The above NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced by the multiplexing function of the NR MAC layer.

[0060] In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of delivering RLC SDUs received from a lower layer directly to an upper layer regardless of order. It may include a function of reassembling and delivering them when a single RLC SDU is received divided into multiple RLC SDUs, and may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs and sorting the order to record the lost RLC PDUs.

[0061] The NR MAC (2-15, 2-30) can be connected to multiple NR RLC layer devices configured in one terminal, and the main functions of the NR MAC may include some of the following functions.

[0062] ● Mapping function (Mapping between logical channels and transport channels)

[0063] ● Multiplexing and demultiplexing of MAC SDUs

[0064] ● Scheduling information reporting function

[0065] ● HARQ function (Error correction through HARQ)

[0066] ● Priority handling between logical channels of one UE

[0067] ● Priority handling between UEs by means of dynamic scheduling

[0068] ● MBMS service identification

[0069] ● Transport format selection function

[0070] ● Padding

[0071] The NR PHY layer (2-20, 2-25) can perform the operation of channel coding and modulating upper layer data, creating OFDM symbols and transmitting them to the wireless channel, or demodulating OFDM symbols received through the wireless channel and channel decoding them to transmit them to the upper layer.

[0072] FIG. 3 is a drawing for explaining the concept of an SBFD of a base station or cell according to one embodiment of the present disclosure.

[0073] Referring to the left side of FIG. 3, the base station (3-05) can determine a frequency-time resource (3-15) to perform wireless communication (3-10) with the terminal (3-20) and schedule downlink (DL) and uplink (UL) resources within the said resource to the terminal. Subband full duplex (SBFD) is basically an operation in a cell that supports Time Division Duplex (TDD), and the following embodiment assumes and describes an operation in a TDD cell.

[0074] The resources allocated to a conventional terminal could consist of a downlink slot (3-25) and an uplink slot (3-45), and one of a flexible or special slot allocated when changing the downlink / uplink direction. With the introduction of SBFD, it became possible to configure SBFD slots (3-30, 3-35, 3-40) in which downlink and uplink resources are mixed between a base station capable of using SBFD and a terminal. Of course, the SBFD slots (3-30, 3-35, 3-40) can be configured not only in the same location as in FIG. 3, but also in any slot that the base station wishes to configure, such as the downlink slot (3-25) in FIG. 3.

[0075] In this situation, to support random access of the terminal, the base station may allocate a RO (RACH occasion) (3-50) for a PRACH (physical random access channel) capable of transmitting and receiving a preamble for random access within an SBFD slot, rather than in the existing uplink slot (3-45). The SBFD RO (3-50) may be contained within an SBFD slot as shown in FIG. 3, may exist across one or more SBFD slots, or may exist across one or more SBFD slots as well as the existing uplink slot (3-45).

[0076] With these SBFD ROs (3-50), terminals capable of using SBFD can obtain additional ROs in addition to existing legacy ROs, thereby enabling them to perform random access with less delay and collision.

[0077] Referring to the right side of FIG. 3, for one SBFD slot (3-55) of a specific serving cell, the terminal can measure the SSB and CSI-RS resources of the surrounding cells. For example, the terminal can perform the surrounding cell measurement in one SBFD slot (3-55) based on at least one of the following situations.

[0078] - Case 1(3-60): The terminal can measure the SSB and / or CSI-RS resources of the surrounding cell from the downlink resources in the SBFD slot.

[0079] - Case 2(3-65): The terminal can measure the SSB and / or CSI-RS resources of surrounding cells in the uplink, downlink, and guard band in the SBFD slot.

[0080] - Case 3(3-70): The terminal can measure the SSB and / or CSI-RS resources of the surrounding cell from the uplink resources in the SBFD slot.

[0081] Hereinafter, in various embodiments of the present disclosure, specific methods for Radio Link Monitoring (RLM) and Radio Resource Management (RRM) are described when a terminal supporting SBFD performs measurements on surrounding cells in an SBFD slot.

[0082] Table 1 below shows examples of how a terminal generally uses Layer 1 measurements (CSI measurements). Referring to Table 1, Layer 1 measurements (CSI measurements) in the serving cell can be used for RRM, beam management, RLM (radio link monitoring), and BFD / BFR (beam failure detection / recovery), and Layer 1 measurements (CSI measurements) in the surrounding cell can be used for RRM.

[0083] Serving cell RRM measurementNeighboring cell measurementL3 RRM measurementL1-BM (L1-RSRP, L1-SINR) with in CSI frameworkL1 RLML1 BFD / BFRL3 RRM measurement

[0084] For example, CSI measurements for a serving cell can be used as an indicator for managing wireless resources between the base station and the terminal for RRM, and can also be utilized as a standard for performing beamforming or beam sweeping through beam management. Additionally, it can be used to track wireless link quality through RLM and to detect and recover from beam failures through BFD / BFR.

[0085] On the other hand, CSI measurements for surrounding cells are primarily used in RRM to monitor surrounding cell resource information, which can be reflected in wireless resource management procedures such as cell selection and handover decisions.

[0086] FIG. 4 is a diagram illustrating cross-link interference of SBFD cells according to one embodiment of the present disclosure.

[0087] In an NR system, cross-link interference (CLI) may occur when operating dynamic TDD scheduling / configuration. From the base station's perspective, remote interference management (RIM) for the terminal can be performed by receiving and applying measurements of cross-link interference. For example, this can be achieved by applying dynamic TDD scheduling. Additionally, the SBFD of FIG. 3 can be applied to this figure. Although this figure describes an example where downlink slots (4-45, 4-65) are applied as SBFD slots, in reality, SBFD operations can be performed on slots in more surrounding cells and the current source cell.

[0088] Referring to FIG. 4, a mobile communication network composed of TDD cells may exist in the vicinity. For example, a serving cell gNB 1 (or base station 1) (4-05) to which terminal 1 (4-15) is connected may support the cell in TDD, and a surrounding cell gNB 2 (or base station 2) (4-10) may also support the cell in TDD. Additionally, there may be terminal 2 (4-20) connected to the base station 2 (4-10) to receive service. The downlink reference signal (4-25) and data transmission transmitted from base station 1 (4-05) to the terminals may be measured as uplink interference (4-35) for base station 2 (4-10). Additionally, the uplink SRS (sounding reference signal) transmission (4-30) or data transmission transmitted by terminal 2 (4-20) to base station 2 (4-10) may be received as cross-link interference (4-40) by a terminal receiving service from another serving cell (e.g., base station 1), such as terminal 1 (4-15).

[0089] In the above, cross-link interference can be measured as SRS-RSRP (SRS received signal received power, the RSRP value for the SRS resource transmitted by the terminal in the surrounding cell measured by the terminal in the current serving cell), and / or CLI-RSSI (CLI received signal strength indicator, the signal strength measured by the terminal in the current serving cell for all signals transmitted by the terminal in the surrounding cell). In this disclosure, the effect of uplink transmission by another terminal on cross-link interference information in downlink slots (4-45, 4-65) configured as SBFD slots is considered.

[0090] Meanwhile, the method for setting up and downlink patterns in an NR TDD system differs from that of an LTE system and can be summarized as follows.

[0091] 1) Cell-specific configuration: Uplink, downlink, and flexible symbol allocation via system information or common RRC messages

[0092] 2) UE-specific configuration: Allocate resources assigned as flexible symbols according to cell-specific configuration to uplink or downlink slots / symbols via dedicated RRC messages.

[0093] 3) Group common indication: group-common PDCCH, i.e., applies the slot settings specified via the SFI (slot format indicator) of DCI format 2_0.

[0094] 4) UE-specific indication: Converts flexible symbols for downlink or uplink use via UE-specific PDCCH, i.e., DCI (downlink control information).

[0095] In other words, resources for basic uplink transmission, flexible transmission, and downlink transmission supported by the cell are allocated for specific slots, and resources allocated for flexible transmission for each terminal can be changed to other transmission methods. In the above, resources for flexible transmission may refer to flexible resources that can be designated as resources for uplink and downlink transmission by base station settings. If the said flexible resource is not changed for other transmissions, neither uplink nor downlink transmission may occur in that resource.

[0096] Referring again to FIG. 4, TDD pattern 1 can be set in a cell supported by base station 1 (4-05). For example, 6 slots (4-45) for downlink transmission, 3 slots (4-50) for flexible transmission, and 5 slots (4-55) for uplink transmission can be set sequentially. Additionally, TDD pattern 2 can be set in a cell supported by base station 2. For example, 2 slots (4-65) for downlink transmission, 1 slot (4-70) for flexible transmission, and 11 slots (4-75) for uplink transmission can be set sequentially.

[0097] Terminal 1 (4-15) and Terminal 2 (4-20), each belonging to Base Station 1 (4-05) and Base Station 2 (4-10), respectively, can perform data transmission and reception and reference signal transmission and reception according to the TDD resource information set in the corresponding serving cell. At this time, a specific downlink section (4-60) set in Terminal 1 (4-15) may overlap with a specific uplink section (4-80) of a surrounding cell, and if Terminal 1 (4-15) is located at the edge of the cell, it may be affected by interference from the surrounding cell. For example, cross-link interference may be received from Terminal 2 (4-20) in the downlink reception section (4-60), which lowers communication performance. More specifically, the interference signal may affect the downlink signal originally intended to be received, increasing the probability of failure in reception and decoding, thereby lowering the data transmission and reception rate. Here, in the case of an SBFD cell, in addition to terminal interference from adjacent cells, downlink and uplink signals can be transmitted simultaneously in the SBFD slot, and it is necessary to measure uplink interference transmitted by other terminals in the same slot.

[0098] To solve the problem described above, the base station may set a interval for measuring SBFD cross-link interference for the terminal. For example, the interval for measuring SBFD cross-link interference may be downlink slots (4-45, 4-65) set as SBFD slots. When the terminal measures SRS-RSRP and / or CLI-RSSI and reports the measured values ​​to the base station, the base station can determine the extent of the terminal's cross-link interference in that interval. Based on this, the base station can adjust the scheduling for SBFD resource allocation and adjust the terminal's uplink / downlink transmission slots and symbols through dynamic TDD settings.

[0099] The entire scenario described in this drawing is not limited to scenarios between SBFD cells, but can also be applied in situations where TDD cells, FDD cells, and SBFD cells are mixed. Furthermore, while this drawing assumes the case where SBFD is set at the slot level, it can be similarly applied when SBFD is set at the symbol level.

[0100] FIG. 5 is a diagram illustrating a procedure for a terminal to perform a Layer 1 channel measurement for SBFD in a cell that supports SBFD, according to one embodiment of the present disclosure.

[0101] FIG. 5 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the illustrated method. For example, although illustrated as a series of steps, each step may occur overlappingly, in parallel, in a different order, or multiple times. In other examples, each step may be omitted or replaced with another step.

[0102] Referring to Fig. 5, when the terminal measures surrounding cells from SBFD resources, it can also perform procedures for Radio Link Monitoring (RLM) and Radio Resource Management (RRM).

[0103] In step 5-15, the terminal (5-05) in the RRC IDLE state can receive system information from the camp-on cell 1 (5-10). For example, the terminal (5-05) can receive SIB1 from cell 1 (5-10). The SIB1 may contain at least one of the following: a slot configuration for semi-static uplink / downlink (UL / DL) resources in TDD, a slot configuration for SBFD resources in the corresponding UL / DL, and a random access configuration for the legacy UE and SBFD UE.

[0104] In step 5-20, the terminal (5-05) applies the settings in SIB1 received from cell 1 (5-10) and can verify random access operations by combining SBFD resource setting information and random access settings. For example, the terminal (5-05) can identify the resources to transmit the random access preamble based on the SBFD resource setting information and random access settings. At this time, the terminal (5-05) can perform SBFD resource usage and random access operations while basically following the TDD UL / DL resource slot settings included in SIB1. For example, if the TDD resource settings and the SBFD resource settings match, the terminal (5-05) can perform PDCCH monitoring operations on the DL resources within the corresponding SBFD resources and on the DL resources in non-SBFD resources, and can perform uplink transmission on the UL resources within the corresponding SBFD resources and on the UL resources in non-SBFD resources.

[0105] In step 5-25, the terminal (5-05) can transmit a random access preamble to cell 1 (5-10) based on the SBFD random access configuration information in SIB1. The random access procedure may be a CBRA (contention based random access) operation based on the SBFD configuration.

[0106] In step 5-30, the terminal (5-05) can receive a RAR message from cell 1 (5-10) based on parameters related to a random access response (RAR) included in the SBFD random access setting information.

[0107] In step 5-35, the terminal (5-05) can send an RRCSetupRequest message to cell 1 (5-10) by applying the received RAR information (e.g., TA, UL grant, Temporary C-RNTI).

[0108] In step 5-40, the terminal (5-05) can receive an RRCSetup message in response to an RRCSetupRequest message transmitted from cell 1 (5-10).

[0109] In step 5-45, the terminal (5-05) can send an RRCSetupComplete message to cell 1 (5-10) and transition to an RRC connection state.

[0110] In step 5-50, the terminal (5-05) may receive an RRCReconfiguration message from the serving cell (5-10). The RRCReconfiguration message may include at least one of an SBFD-related resource setting and an SBFD random access setting. The SBFD-related resource setting and the SBFD random access setting are settings for supporting SBFD in an RRC connection state and may be the same as or different from the settings transmitted from SIB1 in step 5-15. For example, the SBFD resource setting information may be semi-static for cell 1 (5-10), in which case it may be the same as the SBFD resource setting in SIB1. On the other hand, in the case of the SBFD RACH setting, since the SBFD RACH setting for a terminal in an RRC IDLE state and the SBFD RACH setting for a terminal in an RRC connection state may be different, it may be different from the SBFD random access setting in SIB1.

[0111] In addition, the above RRCReconfiguration message may include RLM (Radio Link Monitoring) settings and / or RRM (Radio Resource Management) settings associated with surrounding cell measurements in SBFD resources. RLM-related settings and RRM-related settings are described in more detail below.

[0112] [1. RLM Related Settings]

[0113] For terminals configured with SBFD resources, there may be differences in channel characteristics between SBFD resources (SBFD slots or SBFD symbols) and existing symbols that are not SBFD resources (non-SBFD slots or non-SBFD resources). For example, a specific SBFD resource may be used as a downlink resource by existing terminals, but may be used as an uplink resource by terminals that support SBFD. The base station may request channel measurement from the terminal regarding such SBFD resources, receive the report, and use it for scheduling the resources.

[0114] That is, the terminal can receive resource settings and reporting settings for separate CSI measurements (Layer 1 channel measurements) for SBFD resources and non-SBFD resources, respectively. This is because the terminal may have differences in BFD behavior between SBFD resources and non-SBFD resources. For example, the terminal may experience transmission failures with SBFD resources, but transmission failures may not occur with non-SBFD resources. Alternatively, the opposite situation may occur between the SBFD resources and non-SBFD resources.

[0115] In particular, regarding beam failure detection (BFD) operations, conventionally, representative beams to be measured for BFD are set within a cell, and if all such beams are measured below a certain performance level, the terminal can perform a beam failure recovery (BFR) procedure for the cell containing the beam. Meanwhile, the operation of the above BFR procedure may differ depending on whether the cell is a SpCell (special cell) or a SCell (secondary cell). More specifically, the terminal executes a random access procedure for the BFR procedure in a SpCell, but may not execute a random access procedure for the BFR procedure in a SCell.

[0116] To address the above issues, RLM settings (or CSI settings) in SBFD resources may be provided separately from existing RLM settings (or CSI settings). An RLM setting method exclusive to SBFD may apply at least one of the following or a combination thereof.

[0117] ■ 1st RLM setting method exclusive to SBFD

[0118] ◆ Define a new RLM configuration information element (IE) (e.g., RadioLinkMonitoringConfigSBFD-r19) dedicated to SBFD, which may include RLM resources and related configuration information for SBFD. For example, at least one of the following information elements may be included.

[0119] ● List of resource information for SBFD (failureDetectionResourcesToAddModList)

[0120] ● Information on the maximum number of BF instances to declare a BF in SBFD (beamFailureInstanceMaxCount)

[0121] ● Timer information for BFD in SBFD (beamFailureDetectionTimer)

[0122] Here, the maximum number of BF instances for declaring the BF (beamFailureInstanceMaxCount) and the timer information for the BF (beamFailureDetectionTimer) can be defined as shown in Table 2 below.

[0123] beamFailureDetectionTimerTimer for beam failure detection (see TS 38.321, clause 5.17). See also theBeamFailureRecoveryConfigIE. Value in number of "Q out,LR Reporting periods of Beam Failure Detection" Reference Signal (see TS 38.213, clause 6). Valuepbfd1corresponds to 1 Q out,LR reporting period of Beam Failure Detection Reference Signal, valuepbfd2corresponds to 2 Q out,LR reporting periods of Beam Failure Detection Reference Signal and so on.beamFailureInstanceMaxCountThis field determines after how many beam failure events the UE triggers beam failure recovery (see TS 38.321, clause 5.17). Value n1 corresponds to 1 beam failure instance, value n2 corresponds to 2 beam failure instances and so on.

[0124] ■ Method for setting up the second RLM exclusively for SBFD

[0125] You can include a specific directive (e.g., a 1-bit directive) in the existing RLM configuration (RadioLinkMonitoringConfig) to indicate that the RLM configuration is for SBFD.

[0126] ● In the case of the second RLM setting method dedicated to the above SBFD, existing RLM setting content can be reused.

[0127] In the RLM setting according to the first and second RLM setting methods dedicated to SBFD above, an indicator indicating that a beam is for SBFD may be additionally included in the candidateBeamRSList or reference candidate beam resource list dedicated to SBFD. When the terminal transmits a BFR MAC CE to the base station during BFR operation, it may report a candidate beam index with good performance within the set candidate beam list among the measured beams.

[0128] Table 3 below shows an example of a reference setting for RLM measurements using the above SBFD and non-SBFD resources.

[0129] RadioLinkMonitoringConfig ::= SEQUENCE {failureDetectionResourcesToAddModList SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRSOPTIONAL, -- Need NfailureDetectionResourcesToReleaseList SEQUENCE (SIZE(1..maxNrofFailureDetectionResources)) OF RadioLinkMonitoringRS-IdOPTIONAL, -- Need NbeamFailureInstanceMaxCount ENUMERATED {n1, n2, n3, n4, n5, n6, n8, n10} OPTIONAL, -- Need RbeamFailureDetectionTimer ENUMERATED {pbfd1, pbfd2, pbfd3, pbfd4, pbfd5, pbfd6, pbfd8, pbfd10} OPTIONAL, -- Need R...,[[beamFailure-r17 BeamFailureDetection-r17 OPTIONAL -- Need R]]}RadioLinkMonitoringRS ::= SEQUENCE {radioLinkMonitoringRS-Id RadioLinkMonitoringRS-Id,purpose ENUMERATED {beamFailure, rlf, both},detectionResource CHOICE {ssb-Index SSB-Index,csi-RS-Index NZP-CSI-RS-ResourceId},...}

[0130] [2. RRM 관련 설정]

[0131] The terminal can use SBFD resources differently from their usage in the existing terminal and can measure resources (SSB and / or CSI-RS) transmitted from surrounding cells in those SBFD resources. The base station can separately configure RRM resources dedicated to SBFD for the terminal in addition to resource configurations for the existing RRM. Since the terminal may have better performance in SBFD resources, it may be useful for the base station to check cell performance in all resources for future mobility management.

[0132] For RRM operations on SBFD resources, a terminal may need to measure L1 resources transmitted from the said resource and evaluate cell performance through this. When the terminal measures the RRM measurement results on the said SBFD resource and reports them to the base station, the base station may apply at least one of the following methods to utilize them for handover and / or mobility determination.

[0133] ■ Method of applying SBFD RRM for the first time: The base station may set only measurement reports according to the existing RRM for the terminal. The base station may use the measurement reports according to the existing RRM received from the terminal for handover and / or mobility determination.

[0134] ■ Method for applying 2nd SBFD RRM: The base station may set only the RRM measurement report from the SBFD resource for the terminal. The base station may use the measurement report from the SBFD resource received from the terminal for handover and / or mobility determination.

[0135] ■ 3. Method of applying SBFD RRM: A base station may separately configure RRM measurement reports from SBFD resources and RRM measurement reports from non-SBFD resources for a terminal. The base station may request RRM measurement reports from SBFD resources and RRM measurement reports from non-SBFD resources by distinguishing between them. The base station may receive the RRM measurement reports from the terminal in accordance with the request and use them for handover and / or mobility determination.

[0136] ■ 4. Method for applying SBFD RRM: A base station may integrate the RRM measurement report from SBFD resources and the RRM measurement report from non-SBFD resources for a terminal. The terminal may determine a cell measurement value by considering both the measurement value from SBFD resources and the measurement value from non-SBFD resources and report it to the base station. The base station may use the RRM measurement report received from the terminal for handover and / or mobility determination.

[0137] In the above-described third SBFD RRM application method and fourth SBFD RRM application method, the base station may transmit the RRM setting to the terminal, distinguishing it from the existing RRM setting. To this end, the following describes a method for the base station to explicitly set the RRM in SBFD. In the method for setting the RRM in SBFD described below, at least one of the sub-options or a combination thereof may be applied simultaneously.

[0138] - Method for configuring SBFD RRM 1: How to point to SBFD resources in the measurement object configuration (MeasObjectNR, MO)

[0139] ■ Option 1: The Measurement Object Configuration (MO) includes SSB and / or CSI-RS resources existing within the SBFD resource.

[0140] ■ Option 2: The Measurement Object Configuration (MO) includes SSB and / or CSI-RS resources existing within non-SBFD resources.

[0141] ■ Option 3: The Measurement Object Configuration (MO) includes SSB and / or CSI-RS resources existing within SBFD resources and non-SBFD resources.

[0142] - Second SBFD RRM configuration method: A method that includes an indicator to report SBFD resources in the Report Configuration (ReportConfigNR) (this method can be combined with the case where Option 3 in the above first SBFD RRM configuration method is applied)

[0143] ■ Option 1: Include an indicator in ReportConfigNR to report SSB and / or CSI-RS resources measured within SBFD resources.

[0144] ■ Option 2: Include an indicator in ReportConfigNR to report SSB and / or CSI-RS resources measured within non-SBFD resources.

[0145] ■ Option 3: Include an indicator in ReportConfigNR to report SSB and / or CSI-RS resources measured within SBFD resources and non-SBFD resources.

[0146] - Third SBFD RRM configuration method: A method comprising an indicator indicating that the SSB and / or CSI-RS resources reported in the MeasResults reported by the terminal are values ​​measured within an SBFD resource or a non-SBFD resource (or in both an SBFD resource and a non-SBFD resource).

[0147] Since the above SBFD and non-SBFD resource measurements are not performed in different frequency bands, they are performed together with existing non-SBFD resource measurements without setting a separate measurement gap. However, if the SBFD resource and the non-SBFD resource exist in different frequency bands, a separate measurement gap is set to enable the measurement of the SBFD resource and the non-SBFD resource. Alternatively, even if the measurements are within the same frequency band, they can be distinguished and measured by setting a separate measurement gap.

[0148] Table 4 below shows an example of a reference setup for RRM measurements using the above SBFD and non-SBFD resources.

[0149] MeasObjectNR ::= SEQUENCE {ssbFrequency ARFCN-ValueNR OPTIONAL, -- Cond SSBorAssociatedSSBssbSubcarrierSpacing SubcarrierSpacing OPTIONAL, -- Cond SSBorAssociatedSSBsmtc1 SSB-MTC OPTIONAL, -- Cond SSBorAssociatedSSBsmtc2 SSB-MTC2 OPTIONAL, -- Cond IntraFreqConnectedrefFreqCSI-RS ARFCN-ValueNR OPTIONAL, -- Cond CSI-RSreferenceSignalConfig ReferenceSignalConfig,...ReferenceSignalConfig::= SEQUENCE {ssb-ConfigMobility SSB-ConfigMobility OPTIONAL, -- Need Mcsi-rs-ResourceConfigMobility SetupRelease { CSI-RS-ResourceConfigMobility} OPTIONAL -- Need M}CSI-RS-ResourceConfigMobility ::= SEQUENCE {subcarrierSpacing SubcarrierSpacing,csi-RS-CellList-Mobility SEQUENCE (SIZE (1..maxNrofCSI-RS-CellsRRM)) OF CSI-RS-CellMobility,...,[[refServCellIndex ServCellIndex OPTIONAL -- Need S]]}CSI-RS-CellMobility ::= SEQUENCE {cellId PhysCellId,csi-rs-MeasurementBW SEQUENCE {nrofPRBs ENUMERATED { size24, size48, size96, size192, size264},startPRB INTEGER(0..2169)},density ENUMERATED {d1,d3} OPTIONAL, -- Need Rcsi-rs-ResourceList-Mobility SEQUENCE (SIZE (1..maxNrofCSI-RS-ResourcesRRM)) OF CSI-RS-Resource-Mobility}.

[0150] In step 5-55, cell 1 (5-10) may provide active beam indicator (or TCI state activation) information to the terminal (5-05) to indicate the optimal beam (or TCI state) used for data transmission and reception in the current serving cell. This information may be transmitted via MAC CE or provided via a beam indicator (or TCI field) within the DCI. The terminal (5-05) may then use the beam as the beam of the serving cell and use it for event evaluation, etc., through measurements of surrounding cells.

[0151] In steps 5-60, the terminal (5-05) can perform L1 / L3 measurements based on a beam (resource) set / directed according to the RLM, RRM settings, and / or TCI state activation signal in steps 5-50.

[0152] In step 5-65, based on the RLM measurements in the SBFD and non-SBFD resources, the terminal (5-05) can identify a beam failure detection (BFD) and, accordingly, perform a beam failure recovery (BFR) procedure. More detailed BFD / BFR operations will be described later.

[0153] In steps 5-70, the terminal can trigger a measurement reporting procedure based on corresponding settings according to RRM measurements in SBFD and non-SBFD resources, and can store and generate measurement reporting information separately for SBFD and non-SBFD resources.

[0154] In step 5-75, the terminal (5-05) can transmit a measurement report containing measurement results to cell 1 (5-10).

[0155] In step 5-80, Cell 1 (5-10) can make a handover decision based on the measurement results and transmit a handover command to the terminal (5-05). Additionally, if Cell 1 (5-10) receives measurement results in a measurement report that distinguish between SBFD resources and non-SBFD resources, Cell 1 (5-10) can direct a handover by considering the use of SBFD resources and non-SBFD resources during the handover.

[0156] FIG. 6 is a diagram illustrating the structure of a BFR MAC CE used in BFD and BFR procedures in an SBFD resource according to one embodiment of the present disclosure.

[0157] A BFR MAC CE according to one embodiment of the present disclosure may be associated with the RLM resource configuration described in FIG. 6. The BFR MAC CE may include information about the serving cell where the BFR was triggered and / or information indicating the optimal beam among candidate beams that may be used after the BFR. Here, unlike a BFR in a conventional non-SBFD, the BFR MAC CE may additionally include information indicating whether the reported optimal candidate beam is a beam from an SBFD resource. The top of FIG. 6 illustrates a MAC CE format when there are 8 or fewer serving cells, and the bottom of FIG. 6 illustrates a MAC CE format when there are 8 or more serving cells.

[0158] A BFR MAC CE according to one embodiment of the present disclosure may be in the form of adding only the SBFD field while using the existing BFR MAC CE as is. As another example, a BFR in an SBFD resource may be distinguished from the existing BFR MAC CE as a dedicated SBFD BFR MAC CE using a new eLCID.

[0159] The above BFR MAC CE may include at least one of the following.

[0160] - SP field (6-05, 6-45): Can indicate whether BFE or BFR was triggered in a special cell (PCell or PSCell). For example, if the SP field is set to 1, it can indicate that BFE or BFR was triggered in a special cell (PCell or PSCell).

[0161] - C field (6-10, 6-50): A bitmap where each bit indicates a serving cell that has been BFR triggered. For example, if the Ci field is set to 1, it may indicate that BFR has been triggered in SCell at serving cell index i. If the Ci field is set to 0, it may indicate that BFR has not been triggered in SCell at serving cell index i.

[0162] - AC field (6-15, 6-30, 6-55, 6-70): May indicate whether an optimal candidate beam that can be applied after BFR is indicated (i.e., whether a Candidate RS ID exists). For example, if an optimal beam indicated by a Candidate RS ID exists in the following (belonging to the same octet) Candidate RS ID, the AC field may be set to 1.

[0163] - SBFD (6-20, 6-35, 6-60, 6-75) field: May indicate whether the optimal beam (SSB / CSI-RS) indicated by the Candidate RS ID (belonging to the same octet) is associated with an SBFD resource or a non-SBFD resource. For example, if the SBFD field is set to 1, it may indicate a non-SBFD resource beam, and if set to 0, it may indicate an SBFD resource beam. Alternatively, if the SBFD field is set to 0, it may indicate a non-SBFD resource beam, and if set to 1, it may indicate an SBFD resource beam.

[0164] - Candidate RS ID (6-25, 6-40, 6-65, 6-80) field: Can be set as the index of the optimal candidate beam that can be applied after BFR.

[0165] FIG. 7 is a diagram illustrating the operation of a terminal that performs RLM measurement and BFD / BFR operation using SBFD resources according to one embodiment of the present disclosure.

[0166] FIG. 7 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the illustrated method. For example, although illustrated as a series of steps, each step may occur overlappingly, in parallel, in a different order, or multiple times. In other examples, each step may be omitted or replaced with another step.

[0167] In step 7-05, the terminal may receive SBFD resource settings and / or SBFD random access settings from system information (e.g., SIB1) broadcast by the base station. The system information may further include TDD UL / DL resource slot settings and may be provided to satisfy validity between said settings and SBFD resource settings. For more details, refer to the descriptions of the TDD UL / DL resource settings and SBFD resource settings in FIGS. 3 and 4 above.

[0168] In steps 7-10, the terminal can establish an RRC connection procedure with the base station. To do this, the terminal can perform a random access procedure. More specifically, if SIB1 includes an SBFD random access configuration, the terminal can perform random access through SBFD resources. Alternatively, if an SBFD random access configuration does not exist or the SBFD random access condition is not satisfied, the terminal can perform a random access procedure through existing resources.

[0169] In steps 7-15, the terminal may receive RRC configuration information from the base station. The RRC configuration information may include RLM measurement through SBFD resources and BFD / BFR related settings. More specifically, the description of the RLM related settings described in the embodiment of FIG. 5 may be applied.

[0170] In steps 7-20, the terminal may perform RLM measurements according to the settings in steps 7-15. The resources for the RLM measurements may be configured for the terminal by distinguishing between resources in SBFD resources and resources in non-SBFD resources, or a single RLM resource may be used without distinguishing between SBFD resources and non-SBFD resources. Meanwhile, the terminal determines the quality of the wireless link in the corresponding serving cell through RLM, and if there is a need to report the wireless link in the SBFD resources and the wireless link in the non-SBFD resources separately, the SBFD RLM operation and the non-SBFD RLM operation may be distinguished and applied to the BFD and BFR procedures. If a single unified RLM measurement is used for measuring the wireless link of the corresponding serving cell without distinguishing between the wireless link in the SBFD resources and the wireless link in the non-SBFD resources, the existing RLM and BFD / BFR procedures may be applied as is.

[0171] According to one embodiment of the present disclosure, RLM resources are configured separately for SBFD and non-SBFD, and a terminal measures these resources separately, and accordingly, BFD / BFR operations can also be performed independently on SBFD resources and non-SBFD resources. The following RLM operations and related parameters may be configured and applied separately for SBFD, and existing RLM procedures and related parameters may be used as they are. Here, the use of existing RLM procedures and parameters may mean that beam measurement for SBFD and BFD operations are performed within existing RLM procedures.

[0172] - The terminal can measure the corresponding beam according to the RLM configuration dedicated to SBFD. When the terminal (or the terminal's MAC layer) receives a beam failure instance indication from a lower layer (e.g., PHY layer) as a result of measuring the RLM beams configured for the terminal (or the terminal's MAC layer), the terminal can start / restart the beam failure detection timer for SBFD and increment the beam failure counter for SBFD by 1. For example, the operation of the terminal can be expressed as shown in Table 5 below.

[0173] Upon receiving beam failure instance indication from lower layer (from MAC layer perspective),- start / restart beamFailureDetectionTimerSBFD- increment BFI_COUNTER_SBFD by 1

[0174] - If the beam failure counter for SBFD becomes equal to or greater than the maximum value for beam failure detection, the terminal can detect a beam failure. For example, the operation of the terminal can be expressed as shown in Table 6 below.

[0175] If BFI_COUNTER_ SBFD >= beamFailureInstanceMaxCountSBFD, beam failure is detected.

[0176] Here, the condition for generating the above beam failure instance indication at the lower layer (i.e., the PHY layer) and transmitting it to the upper layer (i.e., the MAC layer) is as follows.

[0177] ■ If the wireless link performance for all RS resources deteriorates below a preset threshold, the lower layer of the terminal (i.e., the PHY layer) may instruct the upper layer (i.e., the MAC layer) to fail the beam. For example, the operation of the terminal can be expressed as shown in Table 7 below.

[0178] When the radio link quality on all the RS resources in set q0 is worse than Qout_LR,send a beam failure instance indication to the higher layer- a set q0 is a set of periodic CSI-RS resources configured by failureDetectionResourcesToAddModList- Qout_LR is defined as the link quality level that correspond to the BLERout = 10% of a hypothetical PDCCH transmission

[0179] - If the wireless link performance of RLM resources configured for SBFD is detected to be worse than a preset threshold, a beam failure instruction can be transmitted from the lower layer to the high layer. For example, the operation of the terminal can be expressed as shown in Table 8 below.

[0180] If the radio link quality on all SBFD RS resources in set q0_SBFD is detected to be worse than Qout_LR_pred for beamFailurePredictionTimerSBFD within beamFailurePredictionWindowSBFD, the lower layer sends beam failure indication to the high layer.

[0181] In steps 7-25, the terminal may perform a BFR procedure based on the BFD result. Since the terminal has identified that the wireless link in the current serving cell is poor, it may perform a procedure to restore the link. The BFR procedure may be performed separately for the SBFD resource, and at least one of the following methods or a combination thereof may be applied to transmit the SBFD BFR MAC CE. Refer to FIG. 6 for the structure of the SBFD BFR MAC CE.

[0182] - 1st SBFD BFR Operation (SpCell BFR Procedure): Method for transmitting SpCell BFR MAC CE

[0183] ■ Option 1: Perform independently of the existing SpCell BFR procedure

[0184] ◆ If SBFD BFR is detected, the terminal may trigger a random access procedure and transmit SBFD BFR MAC CE in msg3 during the random access procedure.

[0185] ◆ If the random access procedure is successfully completed, the terminal may consider the SBFD BFR procedure to have been successfully completed.

[0186] ■ Option 2: Perform considering the existing SpCell BFR procedure (Prioritize the existing BFD / BFR procedure, and perform SBFD BFD / BFR as an additional procedure)

[0187] ◆ The terminal can transmit SBFD BFR MAC CE via UL SCH (PUSCH) even when the wireless link of the corresponding SpCell is good.

[0188] ◆ SBFD BFR MAC CE in SpCell can be delivered on the corresponding serving cell without random access procedure triggering.

[0189] ◆ When the terminal receives a PDCCH addressed to C-RNTI, it may consider the SBFD BFR procedure to have been successfully completed.

[0190] - 2nd SBFD BFR Operation (SCell BFR Procedure): Method for transmitting SCell BFR MAC CE

[0191] ■ SBFD BFR MAC CE in SCell can be delivered on the corresponding serving cell without random access procedure triggering.

[0192] ■ When a terminal receives a PDCCH addressed to C-RNTI, it may consider the SBFD BFR procedure to have been successfully completed.

[0193] In steps 7-30, data transmission and reception can be performed through SBFD resources.

[0194] FIG. 8 is a diagram illustrating the operation of a terminal that performs RRM measurement and reporting operations using SBFD resources according to one embodiment of the present disclosure.

[0195] FIG. 8 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the illustrated method. For example, although illustrated as a series of steps, each step may occur overlappingly, in parallel, in a different order, or multiple times. In other examples, each step may be omitted or replaced with another step.

[0196] In step 8-05, the terminal may receive SBFD resource settings and / or SBFD random access settings from system information (e.g., SIB1) broadcast by the base station. The system information may further include TDD UL / DL resource slot settings and may be provided to satisfy validity between said settings and SBFD resource settings. For details, refer to the descriptions of TDD UL / DL resource settings and SBFD resource settings in FIGS. 3 and 4.

[0197] In steps 8-10, the terminal can establish an RRC connection procedure with the base station. To do this, the terminal can perform a random access procedure. More specifically, if SIB1 includes an SBFD random access configuration, the terminal can perform random access through SBFD resources. Alternatively, if an SBFD random access configuration does not exist or the SBFD random access condition is not satisfied, the terminal can perform a random access procedure through existing resources.

[0198] In steps 8-15, the terminal may receive RRC configuration information from the base station. The RRC configuration information may include settings related to RRM measurement and reporting through SBFD resources. More specifically, the description of the RRM-related settings described in the embodiment of FIG. 5 may be applied.

[0199] In steps 8-20, the terminal can perform RRM measurements according to the settings of steps 8-15. For example, the terminal can perform Layer 3 measurements of surrounding cells. The resources for the RRM measurements may be configured for the terminal by distinguishing between resources in SBFD resources and non-SBFD resources, or a single RRM resource may be used for surrounding cell Layer 3 measurements without distinguishing between SBFD resources and non-SBFD resources. Meanwhile, the terminal can evaluate the cell performance of surrounding cells and the performance of the current serving cell through RRM using Layer 3-based measurements and report this to the base station, thereby allowing the base station to use it for handover / mobility decisions regarding the cells.

[0200] According to one embodiment of the present disclosure, RRM resources separated for SBFD and non-SBFD are set as RRM measurement resources, and as a terminal separates, measures, and reports the resources, RRM can be performed independently in SBFD resources and non-SBFD resources.

[0201] In steps 8-25, the terminal can transmit RRM measurement results of surrounding frequencies / cells to the base station according to a defined reporting setting. Here, the RRM measurement report may include measurement results set for SBFD and measurement results set for non-SBFD separately.

[0202] In steps 8-30, the terminal receives a handover command from the base station and performs a handover operation to the specified target cell. At this time, the RRCReconfiguration message for the target cell included in the handover command may include SBFD-related settings.

[0203] In steps 8-35, the terminal can perform data transmission and reception after completing the handover to the target cell. The terminal can perform data transmission and reception with the target cell through SBFD resources.

[0204] FIG. 9 is a drawing illustrating base station operation according to one embodiment of the present disclosure.

[0205] FIG. 9 illustrates an exemplary method that can be implemented according to the principles of the present disclosure, and various modifications may be made to the illustrated method. For example, although illustrated as a series of steps, each step may occur overlappingly, in parallel, in a different order, or multiple times. In other examples, each step may be omitted or replaced with another step.

[0206] Referring to FIG. 9, the operation of a base station corresponding to the operation of a terminal according to FIG. 7 or FIG. 9h described above is illustrated.

[0207] In step 9-05, the base station may broadcast system information (SIB1) including SBFD resource settings and / or SBFD random access settings. The system information may further include TDD UL / DL resource slot settings and may be provided to satisfy validity between said settings and SBFD resource settings. For details, refer to the descriptions of TDD UL / DL resource settings and SBFD resource settings in FIGS. 3 and 4.

[0208] In steps 9-10, the base station may perform a random access procedure by utilizing SBFD resources in the RRC connection procedure with the terminal. More specifically, if SBFD random access settings are included in SIB1, the base station may perform random access through SBFD resources. Alternatively, if SBFD random access settings are not present or the SBFD random access conditions are not satisfied, the base station may perform a random access procedure using existing resources.

[0209] In steps 9-15, the base station may collect UE Capability information from a connected terminal. For example, the base station may send a UE Capability Enquiry message to the terminal and receive a UE Capability information message in response. The UE Capability information may include SBFD-related UE Capability information. For example, SBFD-related RLM and BFD / BFR-related UE Capability information and / or SBFD-related RRM-related UE Capability information may be reported as SBFD-related UE Capability information. SBFD-related UE Capability information may be provided per terminal or per band (TDD band). Alternatively, SBFD Random Access-related Capability information may be reported separately, and SBFD Random Access-related Capability information may be provided per terminal, per band (TDD band), or included in a Feature Combination.

[0210] In steps 9-20, the base station may transmit RRC configuration information to the terminal. The RRC configuration information may include RLM and BFD / BFR related settings for SBFD and / or resource and reporting settings for RRM measurement for SBFD.

[0211] In steps 9-25, the base station can identify what message it receives from the terminal.

[0212] If the base station receives an SBFD BFR MAC CE from the terminal (either during a random access procedure or on an uplink channel while connected to a serving cell), the base station may provide the terminal with RRC settings to change to the optimal beam based on the information in the SBFD BFR MAC CE in step 9-35, or transmit a beam change instruction (or TCI state instruction). Subsequently, the base station may perform data transmission and reception with the terminal using SBFD resources in step 9-40.

[0213] If a measurement report is received from the terminal in step 9-25, the base station may obtain quality information of the SBFD surrounding cells in step 9-45 (independently of the measurement results of the non-SBFD surrounding cells) and determine the type of target cell (non-SBFD cell or SBFD cell) for the handover. Subsequently, in step 9-50, the base station may instruct the terminal to perform a handover, taking into consideration the SBFD resource configuration to the target cell.

[0214] FIG. 10 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0215] Referring to FIG. 10, the terminal may include an RF (Radio Frequency) processing unit (10-10), a baseband processing unit (10-20), a storage unit (10-30), and a control unit (10-40).

[0216] The RF processing unit (10-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (10-10) up-converts the baseband signal provided by the baseband processing unit (10-20) into an RF band signal, transmits it through an antenna, and down-converts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (10-10) may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC (digital to analog converter), an ADC (analog to digital converter), etc. Although only one antenna is shown in the drawing, the terminal may be equipped with multiple antennas. In addition, the RF processing unit (10-10) may include multiple RF chains. Furthermore, the RF processing unit (10-10) may perform beamforming. For the above beamforming, the RF processing unit (10-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processing unit can perform MIMO and can receive multiple layers when performing MIMO operation.

[0217] The baseband processing unit (10-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the system. For example, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (10-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (10-10). For example, in the case of following the OFDM (orthogonal frequency division multiplexing) method, when transmitting data, the baseband processing unit (10-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT (inverse fast Fourier transform) operation and CP (cyclic prefix) insertion. Additionally, upon receiving data, the baseband processing unit (10-20) divides the baseband signal provided by the RF processing unit (10-10) into OFDM symbol units, restores the signals mapped to subcarriers through a fast Fourier transform (FFT) operation, and then restores the received bit sequence through demodulation and decoding.

[0218] The baseband processing unit (10-20) and the RF processing unit (10-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (10-20) and the RF processing unit (10-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, or a communication unit. Furthermore, at least one of the baseband processing unit (10-20) and the RF processing unit (10-10) may include a plurality of communication modules to support a plurality of different wireless access technologies. Additionally, at least one of the baseband processing unit (10-20) and the RF processing unit (10-10) may include different communication modules to process signals of different frequency bands. For example, the different wireless access technologies may include wireless LAN (e.g., IEEE 802.11), cellular network (e.g., LTE), etc. In addition, the above different frequency bands may include super high frequency (SHF) bands (e.g., 2 NRHz, NRHz) and millimeter wave (e.g., 60 GHz) bands.

[0219] The storage unit (10-30) stores data such as basic programs, application programs, and setting information for the operation of the terminal. In particular, the storage unit (10-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (10-30) provides the stored data upon request from the control unit (10-40).

[0220] The control unit (10-40) controls the overall operations of the terminal. For example, the control unit (10-40) transmits and receives signals through the baseband processing unit (10-20) and the RF processing unit (10-10). Additionally, the control unit (10-40) writes and reads data to and from the storage unit (10-40). To this end, the control unit (10-40) may include at least one processor. For example, the control unit (10-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs.

[0221] FIG. 11 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0222] Referring to FIG. 11, the base station may include an RF processing unit (11-10), a baseband processing unit (11-20), a backhaul communication unit (11-30), a storage unit (11-40), and a control unit (11-50).

[0223] The RF processing unit (11-10) performs functions for transmitting and receiving signals through a wireless channel, such as signal band conversion and amplification. That is, the RF processing unit (11-10) upconverts the baseband signal provided by the baseband processing unit (11-20) into an RF band signal, transmits it through an antenna, and downconverts the RF band signal received through the antenna into a baseband signal. For example, the RF processing unit (11-10) may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc. Although only one antenna is shown in the drawing, the first connection node may be equipped with multiple antennas. Additionally, the RF processing unit (11-10) may include multiple RF chains. Furthermore, the RF processing unit (11-10) may perform beamforming. For the above beamforming, the RF processing unit (11-10) can adjust the phase and magnitude of each of the signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit can perform down-to-down MIMO operation by transmitting one or more layers.

[0224] The baseband processing unit (11-20) performs a conversion function between a baseband signal and a bit sequence according to the physical layer specifications of the first wireless access technology. For example, when transmitting data, the baseband processing unit (11-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (11-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (11-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (11-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through IFFT operation and CP insertion. Additionally, upon receiving data, the baseband processing unit (11-20) divides the baseband signal provided by the RF processing unit (11-10) into OFDM symbol units, restores the signals mapped to subcarriers through FFT operations, and then restores the received bit sequence through demodulation and decoding. The baseband processing unit (11-20) and the RF processing unit (11-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (11-20) and the RF processing unit (11-10) may be referred to as a transmitting unit, a receiving unit, a transmitting and receiving unit, a communication unit, or a wireless communication unit.

[0225] The backhaul communication unit (11-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (11-30) converts a bit sequence transmitted from the main base station to another node, e.g., an auxiliary base station, a core network, etc., into a physical signal, and converts a physical signal received from the other node into a bit sequence.

[0226] The storage unit (11-40) stores data such as basic programs, application programs, and configuration information for the operation of the main station. In particular, the storage unit (11-40) can store information regarding bearers assigned to connected terminals, measurement results reported from connected terminals, etc. Additionally, the storage unit (11-40) can store information that serves as a criterion for determining whether to provide multiple connections to the terminal or to disconnect them. Furthermore, the storage unit (11-40) provides the stored data upon the request of the control unit (11-50).

[0227] The control unit (11-50) controls the overall operations of the main station. For example, the control unit (11-50) transmits and receives signals through the baseband processing unit (11-20) and the RF processing unit (11-10) or through the backhaul communication unit (11-30). Additionally, the control unit (11-50) writes and reads data to and from the storage unit (11-40). To this end, the control unit (11-50) may include at least one processor.

Claims

1. A method performed by a terminal of a wireless communication system, A step of receiving system information including SBFD (subband full duplex) resource settings and random access settings; A step of establishing an RRC (radio resource control) connection based on the above SBFD resource settings and the above random access settings; Receiving an RRC message comprising at least one of a radio link monitoring (RLM) setting for SBFD and a radio resource management (RRM) setting for SBFD; and A method comprising the step of performing an RLM measurement based on the RLM-related settings for the above SBFD, or performing an RRM measurement based on the RRM-related settings for the above SBFD.

2. In Paragraph 1, The RRM-related settings for the above SBFD include measurement object settings, and A method characterized in that the above measurement object setting indicates at least one of a reference signal resource existing within an SBFD resource, a reference signal resource existing within a non-SBFD resource, or a reference signal resource existing in both the SBFD resource and the non-SBFD resource.

3. In Paragraph 1, The RRM-related settings for the above SBFD include measurement reporting settings, and A method characterized in that the above measurement reporting setting includes at least one of information instructing the terminal to report a reference signal resource measured within an SBFD resource, information instructing the terminal to report a reference signal resource measured within a non-SBFD resource, or information instructing the terminal to report a reference signal resource measured in both the SBFD resource and the non-SBFD resource.

4. In Paragraph 1, The method further includes the step of transmitting a measurement report containing the results of the above RRM measurement, and A method characterized in that the above measurement report includes information indicating whether the result of the above RRM measurement is a value measured within an SBFD resource or a value measured within a non-SBFD resource.

5. In Paragraph 1, A method characterized in that the RLM-related settings for the above SBFD include information on the maximum number of beam failure instances for the SBFD and information on the beam failure detection timer for the SBFD.

6. In Paragraph 5, When receiving a beam failure instance instruction based on the result of the RLM measurement from a lower layer, a step of incrementing a beam failure counter for SBFD; and A method further comprising the step of identifying a beam failure when the beam failure counter for the SBFD reaches the maximum number of beam failure instances for the SBFD.

7. In Paragraph 6, A method further comprising the step of transmitting a MAC (medium access control) CE (control element) containing information about a candidate beam for a BFR (beam failure recovery) procedure based on identifying the beam failure.

8. In Paragraph 7, The MAC CE further includes a 1-bit identifier contained within the same octet as the RS (reference signal) ID (identifier) ​​field associated with the candidate beam, and A method characterized in that the above 1-bit indicator indicates whether the candidate beam is associated with an SBFD resource or a non-SBFD resource.

9. In a terminal of a wireless communication system, Transmitter / receiver; and It includes a control unit coupled to the above-mentioned transmitting and receiving unit, and the control unit, System information including SBFD (subband full duplex) resource settings and random access settings is received through the transceiver, and Based on the above SBFD resource settings and the above random access settings, establish an RRC (radio resource control) connection, and Receive an RRC message through the transceiver that includes at least one of a setting related to RLM (radio link monitoring) for SBFD and a setting related to RRM (radio resource management) for SBFD, and A terminal characterized by being configured to perform RLM measurement based on the RLM-related settings for the above SBFD, or to perform RRM measurement based on the RRM-related settings for the above SBFD.

10. In Paragraph 9, The RRM-related settings for the above SBFD include measurement object settings, and A terminal characterized in that the above measurement object setting indicates at least one of a reference signal resource existing within an SBFD resource, a reference signal resource existing within a non-SBFD resource, or a reference signal resource existing in both the SBFD resource and the non-SBFD resource.

11. In Paragraph 9, The RRM-related settings for the above SBFD include measurement reporting settings, and A terminal characterized by the above measurement reporting setting including at least one of information instructing the terminal to report a reference signal resource measured within an SBFD resource, information instructing the terminal to report a reference signal resource measured within a non-SBFD resource, or information instructing the terminal to report a reference signal resource measured in both the SBFD resource and the non-SBFD resource.

12. In Paragraph 9, The above control unit is further configured to transmit a measurement report including the result of the RRM measurement through the above transmission and reception unit, and A terminal characterized in that the above measurement report includes information indicating whether the result of the above RRM measurement is a value measured within an SBFD resource or a value measured within a non-SBFD resource.

13. In Paragraph 9, A terminal characterized in that the above RLM-related settings for SBFD include information on the maximum number of beam failure instances for SBFD and information on the beam failure detection timer for SBFD.

14. In Paragraph 9, The above control unit is, When a beam failure instance instruction based on the result of the above RLM measurement is received from a lower layer, the beam failure counter for SBFD is incremented, and When the beam failure counter for the above SBFD reaches the maximum number of beam failure instances for the above SBFD, identify the beam failure, and A terminal characterized by being further configured to transmit a medium access control (MAC) control element (CE) containing information on a candidate beam for a beam failure recovery (BFR) procedure through the transceiver, based on identifying the beam failure.

15. In Paragraph 14, The MAC CE further includes a 1-bit identifier contained within the same octet as the RS (reference signal) ID (identifier) ​​field associated with the candidate beam, and A terminal characterized by the above 1-bit indicator indicating whether the candidate beam is associated with an SBFD resource or a non-SBFD resource.

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