Method and apparatus for performing inter-base station coordination for partial band multiplexing in next-generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure relates to a method and an apparatus for performing inter-base station coordination for partial band multiplexing in a next-generation mobile communication system, the method comprising the steps of: transmitting, by a base station, a first message to at least one neighboring base station for receiving configuration information regarding a resource associated with cross link interference (CLI) of the at least one neighboring base station; receiving, from the at least one neighboring base station, a second message including configuration information regarding a resource associated with the CLI of the at least one neighboring base station; and transmitting, to a terminal, a third message including CLI resource configuration information associated with subband full duplex (SBFD), which is determined on the basis of the configuration information regarding the resource associated with the CLI of the at least one neighboring base station.

Description

Method and apparatus for performing inter-base station coordination for partial band multiplexing in a next-generation mobile communication system

[0001] The present invention relates to the operation of a terminal and a base station in a mobile communication system. More specifically, the present invention relates to a method and apparatus for performing coordination between base stations for partial band multiplexing in a next-generation mobile 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, physical layer standardization 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 that meets various regulatory requirements; NR terminal low power consumption technology (UE Power Saving); Non-Terrestrial Network (NTN), which is direct terminal-satellite communication for securing coverage in areas where communication with the terrestrial network is impossible; and positioning.

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

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

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

[0008] As a result of the aforementioned developments and advancements in mobile communication systems, it has become possible to provide a variety of services, and thus measures to effectively provide these services are required.

[0009] The present invention considers a method for a terminal to receive service from a cell in which conditional Subband Full Duplex (SBFD; partial band bidirectional communication) is configured, a method for sharing SBFD settings between multiple base stations and configuring the terminal, and a method for receiving cross-link interference (CLI) configuration information from surrounding cells and providing the configuration to the terminal.

[0010] The technical problems to be solved by the present invention are not limited to those mentioned above, and other unmentioned technical problems may be considered by those skilled in the art from the various embodiments of the present disclosure described below.

[0011] A method performed by a base station of a wireless communication system according to an embodiment of the present invention for solving the above-mentioned problems may include: a step of transmitting a first message to at least one surrounding base station for obtaining configuration information for a resource associated with cross-link interference (CLI) of at least one surrounding base station; a step of receiving a second message from at least one surrounding base station that includes configuration information for a resource associated with the CLI of at least one surrounding base station; and a step of transmitting a third message to a terminal that includes configuration information for a CLI resource associated with a subband full duplex (SBFD) determined based on configuration information for a resource associated with the CLI of at least one surrounding base station.

[0012] According to an embodiment, the configuration information for a resource associated with the CLI of the at least one surrounding base station may include the configuration information for a sounding reference signal (SRS) resource of the at least one surrounding base station.

[0013] According to an embodiment, the first message and the second message may be transmitted via an Xn message or an F1 message.

[0014] According to an embodiment, the CLI resource configuration information associated with the SBFD may include information regarding resources associated with the CLI that are included in the active BWP (bandwith part) of the base station, among the resources associated with the CLI according to the configuration information for resources associated with the CLI of at least one surrounding base station.

[0015] According to an embodiment, the CLI resource setting information associated with the SBFD may include at least one of SRS-RSRP (SRS received signal received power) resource setting information and CLI-RSSI (CLI received signal strength indicator) resource setting information.

[0016] In addition, a method performed by a terminal of a wireless communication system according to an embodiment of the present invention for solving the above-mentioned problems may include: receiving a third message from a base station containing CLI resource setting information associated with a subband full duplex (SBFD) determined based on setting information for a resource associated with cross link interference (CLI) of at least one surrounding base station; and reporting a result measured based on the CLI resource setting information associated with the SBFD to the base station.

[0017] According to an embodiment, the CLI resource configuration information associated with the SBFD may include information regarding resources associated with the CLI that are included in the active BWP (bandwith part) of the base station, among the resources associated with the CLI according to the configuration information for resources associated with the CLI of at least one surrounding base station.

[0018] According to an embodiment, the CLI resource setting information associated with the SBFD may include at least one of SRS-RSRP (SRS received signal received power) resource setting information and CLI-RSSI (CLI received signal strength indicator) resource setting information.

[0019] In addition, a base station of a wireless communication system according to an embodiment of the present invention for solving the above-mentioned problems may include: a transceiver; and a control unit connected to the transceiver, which transmits a first message to the at least one surrounding base station for obtaining configuration information for a resource associated with cross-link interference (CLI) of the at least one surrounding base station, receives a second message from the at least one surrounding base station containing configuration information for a resource associated with the CLI of the at least one surrounding base station, and transmits a third message to a terminal containing CLI resource configuration information associated with a subband full duplex (SBFD) determined based on the configuration information for a resource associated with the CLI of the at least one surrounding base station.

[0020] In addition, a terminal of a wireless communication system according to an embodiment of the present invention for solving the above-mentioned problems may include: a transceiver; and a control unit connected to the transceiver, which receives from a base station a third message containing CLI resource setting information associated with a subband full duplex (SBFD) determined based on setting information for a resource associated with cross link interference (CLI) of at least one surrounding base station, and reports a result measured based on the CLI resource setting information associated with the SBFD to the base station.

[0021] The SBFD (Subband Full Duplex) terminal proposed in the present invention can reduce interference effects on adjacent cells and terminals by defining operations for data transmission and reception of SBFD resources in cells supporting SBFD, particularly for measurement and reporting of CLI (cross link interference) resources.

[0022] The effects obtainable in the present disclosure are not limited to those mentioned in the various embodiments, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0023] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention is applied.

[0024] FIG. 1b is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied.

[0025] FIG. 1c is a drawing for explaining the concept of a subband full duplex (hereinafter SBFD) of a base station or cell according to one embodiment of the present invention.

[0026] FIG. 1d is a diagram illustrating cross-link interference when SBFD cells are configured in a next-generation mobile communication system according to one embodiment of the present invention.

[0027] FIG. 1e is a diagram illustrating scenarios for providing CLI settings in an SBFD according to an embodiment of the present invention, and describes which SBFD resource is used to set CLI measurement resources for surrounding cells in a terminal.

[0028] FIGS. 1fa and 1fb illustrate the overall operation for a terminal according to an embodiment of the present invention to measure cross-link interference of another terminal in a cell that supports SBFD.

[0029] FIG. 1g is a diagram illustrating the overall terminal operation of performing CLI measurements using SBFD resources according to one embodiment of the present invention.

[0030] FIG. 1h is a drawing illustrating the operation of a base station according to an embodiment of the present invention.

[0031] FIG. 1i is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present invention.

[0032] FIG. 1j is a block diagram showing the configuration of a base station according to one embodiment of the present invention.

[0033] 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, specific descriptions of related known functions or configurations will be omitted if it is determined that such detailed descriptions would unnecessarily obscure the essence of the invention. 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, their definitions should be based on the content throughout this specification.

[0034] 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 examples provided 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.

[0035] Hereinafter, a base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (Base Station), radio access unit, base station controller, or a node on a network. A terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) refers to a wireless transmission path of a signal transmitted by a base station to a terminal, and an uplink (UL) refers to a wireless transmission path of a signal transmitted by a terminal to a base station. Furthermore, while an LTE or LTE-A system may be described as an example below, embodiments of this disclosure may be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included in a system to which embodiments of this disclosure can be applied, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without departing significantly from the scope of the present disclosure. In this case, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams may be executed by computer program instructions.

[0036] Since these computer program instructions can be loaded onto the processor of a general-purpose computer, a computer for special purposes, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means for performing the functions described in the flowchart block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement functions in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing means of instruction for performing the functions described in the flowchart block(s). Since the computer program instructions can also be loaded onto the computer or other programmable data processing equipment, the instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a computer-executable process can also provide steps for performing the functions described in the flowchart block(s).

[0037] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). Also, it should be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may be executed in reverse order depending on the corresponding function. In this case, the term "part" as used in this embodiment refers to software or hardware components such as a Field Programmable Gate Array (FPGA) or an Application Specific Integrated Circuit (ASIC), and the "part" may perform certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Accordingly, as an example, 'part' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and 'parts' may be combined into a smaller number of components and 'parts' or further separated into additional components and 'parts'. Furthermore, the components and 'parts' may be implemented to utilize one or more CPUs within a device or secure multimedia card. Additionally, in an embodiment, 'part' may include one or more processors.

[0038] For the convenience of the following explanation, the present invention uses terms and names defined in the LTE (3rd Generation Partnership Project Long Term Evolution), 5GS, and NR specifications, which are standards defined by the 3GPP (The 3rd Generation Partnership Project) organization among currently existing communication standards. 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. For example, the present invention can be applied to 3GPP 5GS / NR (5th generation mobile communication standard).

[0039] FIG. 1a is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention is applied.

[0040] Referring to FIG. 1a, 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, 1a-10) and an NR CN (New Radio Core Network, or NG CN: Next Generation Core Network, 1a-05). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal, 1a-15) connects to an external network through the NR NB (1a-10) and the NR CN (1a-05).

[0041] In FIG. 1a, the NR NB (1a-10) corresponds to the eNB (Evolved Node B) of the existing LTE system. The NR NB (1a-10) is connected to the NR UE (1a-15) via a radio channel (radio access, 1a-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 (1a-15) and perform scheduling, and this is handled by the NR NB (1a-10). A single NR NB (1a-10) typically controls multiple cells. To achieve ultra-high-speed data transmission compared to existing LTE, the next-generation mobile communication system can have a maximum bandwidth greater than that of the existing system, and can additionally incorporate beamforming technology by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as the radio access technology. In addition, the next-generation mobile communication system applies an Adaptive Modulation & Coding (hereinafter referred to as AMC) method that determines the modulation scheme and channel coding rate according to the channel status of the terminal (1a-15). The NR CN (1a-05) performs functions such as mobility support, bearer configuration, and QoS (quality of service) configuration. The NR CN (1a-05) is a device responsible for various control functions as well as mobility management functions for the terminal (1a-15) and can be connected to multiple base stations (1a-10). Furthermore, the next-generation mobile communication system can be interoperable with the existing LTE system, and the NR CN (1a-05) can be connected to the MME (1a-25) via a network interface. The MME (1a-25) can be connected to the existing base station eNB (1a-30).

[0042] FIG. 1b is a diagram showing the wireless protocol structure of a next-generation mobile communication system to which the present invention can be applied.

[0043] Referring to Fig. 1b, the wireless protocol of the next-generation mobile communication system consists of NR SDAP (1b-01, 1b-45), NR PDCP (1b-05, 1b-40), NR RLC (1b-10, 1b-35), and NR MAC (1b-15, 1b-30) at the terminal and the NR base station, respectively.

[0044] The main functions of NR SDAP (1b-01, 1b-45) may include some of the following functions.

[0045] - User data transfer function (transfer of user plane data)

[0046] - Mapping function between a QoS flow and a DRB for both DL and UL for uplink and downlink

[0047] - Marking QoS flow ID for uplink and downlink (marking QoS flow ID in both DL and UL packets)

[0048] - Function to map reflective QoS flow to data bearers for uplink SDAP PDUs (reflective QoS flow to DRB mapping for the UL SDAP PDUs).

[0049] 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.

[0050] The main functions of NR PDCP (1b-05, 1b-40) may include some of the following functions.

[0051] ● Header compression and decompression features (ROHC only)

[0052] ● User data transfer function (Transfer of user data)

[0053] ● Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0054] ● Out-of-sequence delivery of upper layer PDUs

[0055] ● Reordering function (PDCP PDU reordering for reception)

[0056] ● Duplicate detection function (Duplicate detection of lower layer SDUs)

[0057] ● Retransmission of PDCP SDUs

[0058] ● Encryption and decryption functions (Ciphering and deciphering)

[0059] ● Timer-based SDU discard in uplink.

[0060] 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.

[0061] The main functions of NR RLC(1b-10, 1b-35) may include some of the following functions.

[0062] ● Data transfer function (Transfer of upper layer PDUs)

[0063] ● Sequential delivery function (In-sequence delivery of upper layer PDUs)

[0064] ● Out-of-sequence delivery of upper layer PDUs

[0065] ● ARQ Function (Error Correction through ARQ)

[0066] ● Concatenation, segmentation, and reassembly functions of RLC SDUs

[0067] ● Re-segmentation of RLC data PDUs

[0068] ● Reordering function (Reordering of RLC data PDUs)

[0069] ● Duplicate detection

[0070] ● Error detection function (Protocol error detection)

[0071] ● RLC SDU discard function

[0072] ● RLC re-establishment function

[0073] 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 with the multiplexing function of the NR MAC layer.

[0074] In the above, the out-of-sequence delivery function of the NR RLC device refers to the 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 RLC SDUs 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.

[0075] The NR MAC (1b-15, 1b-30) can be connected to multiple NR RLC layer devices configured in a terminal, and the main functions of the NR MAC may include some of the following functions.

[0076] ● Mapping function (Mapping between logical channels and transport channels)

[0077] ● Multiplexing and demultiplexing of MAC SDUs

[0078] ● Scheduling information reporting function

[0079] ● HARQ function (Error correction through HARQ)

[0080] ● Priority handling between logical channels of one UE

[0081] ● Priority handling between UEs by means of dynamic scheduling

[0082] ● MBMS service identification

[0083] ● Transport format selection function

[0084] ● Padding

[0085] The NR PHY layer (1b-20, 1b-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.

[0086] FIG. 1c is a drawing for explaining the concept of subband full duplex (hereinafter SBFD) of a base station or cell according to one embodiment of the present invention.

[0087] Referring to FIG. 1c, a base station (1c-05) performs wireless communication (1c-10) with a terminal (1c-20). To this end, frequency and time resources (1c-15) are determined, and downlink (DL) and uplink (UL) resources within the resources can be allocated (scheduled) to the terminal (1c-20). Subband Full Duplex (SBFD) is basically an operation in a cell that supports Time Division Duplex (TDD), and in the following embodiment, the operation in a TDD cell is assumed and described. The resources (1c-15) allocated to the conventional terminal (1c-20) could be composed of a downlink slot (1c-25), an uplink slot (1c-45), and one of a flexible or special slot allocated when changing the downlink / uplink direction. With the introduction of SBFD, it is possible to configure SBFD slots (1c-30, 1c-35, 1c-40) in which downlink and uplink resources are mixed between a base station (1c-05) capable of using SBFD and the terminal (1c-20). The SBFD slots (1c-30, 1c-35, 1c-40) may include downlink resources, uplink resources, and a guard band. The SBFD slots (1c-30, 1c-35, 1c-40) can be set not only in the same location as in Fig. 1c, but can also be set in any slot that the base station (1c-05) wants to set, for example, the Downlink slot of 1c-25.

[0088] In this situation, to support random access of the terminal (1c-20), the base station (1c-05) may allocate an uplink physical layer Random Access Channel (PRACH) capable of transmitting and receiving a preamble for random access within the SBFD slots (1c-30, 1c-35, 1c-40) rather than the existing uplink slot (1c-45), and may allocate a RACH occasion (RO) (1c-50). The SBFD RO (1c-50) may be contained within the SBFD slot as shown in FIG. 1c, may exist across one or more SBFD slots, and may exist across not only one or more SBFD slots but also the normal Uplink slot (1c-45).

[0089] Through this SBFD RO (1c-50), the terminal (1c-20) capable of using SBFD obtains additional RO opportunities in addition to the existing legacy RO, thereby enabling random access with even less delay and collision.

[0090] As explained above, a base station (1c-05) or cell that supports SBFD can support random access using SBFD resources according to the RRC connection status of the terminal (1c-20), and for this purpose, a physical Random Access Channel (PRACH) must be allocated and a RACH occasion (RO) must be allocated.

[0091] FIG. 1d is a diagram illustrating cross-link interference when SBFD cells are configured in a next-generation mobile communication system according to one embodiment of the present invention.

[0092] FIG. 1d is a diagram illustrating the influence of cross-link interference (CLI) on operating dynamic TDD scheduling / configuration in an NR system applicable to the entire present invention, and the present invention is proposed to support such a scenario. Furthermore, from the perspective of a base station, remote interference management (RIM) for a 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. 1c can be applied to FIG. 1d. FIG. 1d describes an example where downlink symbols in 1d-45 and 1d-65 are applied as symbols for SBFD slots. In practice, SBFD operations can be performed on more surrounding cells and slots (or symbols) in the current source cell.

[0093] Referring to FIG. 1d, a mobile communication network composed of TDD cells may exist in the vicinity. For example, as illustrated above, if a serving cell, gNB 1 (1d-05, or base station 1), to which terminal 1 (1d-15) is connected supports TDD in that cell, a surrounding cell gNB 2 (1d-10, or base station 2) may also support its own cell with TDD. Additionally, there may be terminal 2 (1d-20) connected to the gNB 2 (1d-10) to receive service. Furthermore, the downlink reference signal (1d-25) and data transmission transmitted from base station 1 (1d-05) to the terminals (1d-15) may be measured as uplink interference (1d-35) for base station 2 (1d-10). Additionally, the uplink SRS (sounding reference signal) transmission (1d-30) or data transmission transmitted by terminal 2 (1d-20) to base station 2 (1d-30), which is the corresponding serving cell, may be received as cross-link interference (1d-40) by a terminal (1d-15) that is receiving service from another serving cell (base station 1, 1d-05), such as terminal 1 (1d-15). In the above, the measurement values ​​of cross-link interference may include SRS-RSRP (SRS received signal received power, the RSRP value for the SRS resource transmitted by a terminal belonging to a neighboring cell and the SRS resource measured by a terminal belonging to the current serving cell) and CLI-RSSI (CLI received signal strength indicator, the signal strength measured by a terminal belonging to the current serving cell for all signals transmitted by a terminal belonging to a neighboring cell). In particular, the present invention considers the influence of cross-link interference information of CLI resources (SRS-RSRP and SCLI-RSSI) transmitted by other terminals in specific SBFD slots at 1d-45 and 1d-60.

[0094] The method of setting uplink / downlink symbols in an NR TDD system differs from that of an LTE system and can be summarized as follows.

[0095] 1) Cell-specific configuration: Flexible uplink and downlink symbol allocation via system information or common RRC signals

[0096] 2) UE-specific configuration: Allocate resources assigned as flexible symbols to uplink or downlink symbols via dedicated RRC messages.

[0097] 3) Setting via group common indication: Change flexible symbols via group-common PDCCH, i.e., SFI (slot format indicator).

[0098] 4) UE-specific indication: Change flexible symbols via UE-specific PDCCH, i.e., DCI (downlink control indicator).

[0099] In other words, symbols for basic uplink transmission, flexible transmission, and downlink transmission supported by the cell are allocated for specific slots, and symbols allocated for flexible transmission can be changed to other transmission methods for each terminal. In the above, the symbols for flexible transmission refer to flexible symbols that can be designated as symbols for uplink and downlink transmission by base station settings. If the corresponding flexible symbol is not changed for other transmission, neither uplink nor downlink transmission occurs for that symbol.

[0100] For example, as illustrated in FIG. 1d, TDD pattern 1 (1d-45, 1d-50, 1d-55) can be configured in a cell supported by base station 1 (1d-05). That is, in a slot consisting of a total of 14 symbols, 6 symbols (1d-45) for downlink transmission, 3 symbols (1d-50) for flexible transmission, and 5 symbols (1d-55) for uplink transmission can be configured sequentially. Additionally, TDD pattern 2 (1d-65, 1d-70, 1d-75) can be configured in a cell supported by base station 2 (1d-10). That is, in a slot consisting of a total of 14 symbols, 2 symbols (1d-65) for downlink transmission, 1 symbol (1d-70) for flexible transmission, and 11 symbols (1d-75) for uplink transmission can be sequentially set. In the above situation, terminal 1 (1d-15) and terminal 2 (1d-20), each belonging to base station 1 (1d-05) and base station 2 (1d-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. A specific downlink section (1d-60) set in terminal 1 (1d-15) may overlap with a specific uplink section (1d-80) of a surrounding cell, and in the case of terminal 1 (1d-15) located at the edge of the cell, it may be affected by interference from the surrounding cell (1d-10). That is, in the section (1d-60) where terminal 1 (1d-15) receives downlink, it may receive cross-link interference from terminal 2 (1d-20), which lowers communication performance. The above communication performance lowers the data transmission and reception rate because the interference signal affects the downlink signal that terminal 1 (1d-15) originally intends to receive, increasing the probability of failure in reception and decoding.Here, in the case of an SBFD cell, in addition to terminal interference from adjacent cells, downlink and uplink signals occur simultaneously in the corresponding SBFD slot even within the same cell, and it may be necessary to measure uplink interference transmitted by other SBFD terminals in the same slot.

[0101] Regarding the problem described above, when the terminal measures SRS-RSRP and CLI-RSSI during the interval (1d-45, 1d-65) in which the base station instructs the terminal to measure SBFD cross-link interference, and the terminal 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 can adjust the terminal's uplink / downlink transmission slots and symbols through dynamic TDD settings.

[0102] The overall scenario described in Figure 1d is not limited to scenarios between SBFD cells, and can also be applied in situations where TDD cells, FDD cells, and SBFD cells are mixed.

[0103] FIG. 1e is a diagram illustrating scenarios for providing CLI settings in an SBFD according to an embodiment of the present invention, and describes which SBFD resource is used to set CLI measurement resources for surrounding cells in a terminal.

[0104] Regarding CLI measurements in which signals transmitted by other terminals of surrounding cells and the current serving cell cause interference to the receiving terminal, in the SBFD situation of the present invention, CLI measurements in the following cases may be considered. As measurements of cross-link interference, there may be SRS-RSRP (SRS received signal received power, the RSRP value for the SRS resource measured by the terminal belonging to the current serving cell against the SRS resource transmitted by other terminals belonging to surrounding cells or the current serving cell) and CLI-RSSI (CLI received signal strength indicator, the signal strength measured by the terminal belonging to the current serving cell against all signals transmitted by terminals belonging to surrounding cells or the current serving cell).

[0105] - 1c-05: Method for configuring the first CLI in an SBFD slot

[0106] ■ CLI-RSSI resource measurement in the downlink subband of an SBFD slot

[0107] ■ The CLI to the downlink subband of SBFD can be broadly composed of two types.

[0108] ◆ Uplink signals transmitted by other terminals in the uplink subband of the SBFD are transmitted as leakage signals

[0109] ◆ Uplink transmission from a terminal in another cell exists as interference in the downlink subband of the measurement terminal's SBFD slot.

[0110] ■ If a serving cell receives resource configuration information related to uplink transmission from a terminal in another cell and uses it to enhance downlink transmission (such as DL PDSCH mutting), it can affect the reduction of CLI.

[0111] - 1c-10: How to configure the second CLI in the SBFD slot

[0112] ■ SRS-RSRP resource measurement in the uplink subband of the SBFD slot

[0113] ■ In order to measure the SRS-RSRP resources transmitted by another terminal in a neighboring cell in the uplink subband of an SBFD slot, the serving cell must receive the SRS configuration information transmitted by another terminal from the neighboring cell.

[0114] ■ SRS resource settings in neighboring cells can be dynamically set in periodic, semi-periodic, or non-periodic ways, and it is necessary to dynamically exchange SRS resource settings of terminals belonging to these neighboring cells between cells.

[0115] - 1c-15: How to configure the third CLI in an SBFD slot

[0116] ■ CLI-RSSI resource measurement in the uplink subband of the SBFD slot

[0117] ■ If a serving cell receives resource configuration information related to uplink transmission from a terminal in another cell and uses it to enhance downlink transmission (such as DL PDSCH mutting), it can affect the reduction of CLI.

[0118] - 1c-20: How to configure the 4th CLI in the SBFD slot

[0119] ■ CLI-RSSI resource measurement in the guard band subband of the SBFD slot

[0120] ■ If a serving cell receives resource configuration information related to uplink transmission from a terminal in another cell and uses it to enhance downlink transmission (such as DL PDSCH mutting), it can affect the reduction of CLI.

[0121] FIGS. 1fa and 1fb illustrate the overall operation for a terminal according to an embodiment of the present invention to measure cross-link interference of another terminal in a cell that supports SBFD.

[0122] Referring to Figures 1fa and 1fb, first, base station 1 (cell 1) (1f-02) and base station 2 (cell 2) (1f-03) may have a procedure to share each other's SBFD settings in advance. That is, in step 1f-05, base station 1 (1f-02) transmits cell common settings, such as its SBFD TDD / FDD settings, to the neighboring base station 2 (1f-03) and may request SBFD-related settings from base station 2 (1f-03).

[0123] In step 1f-10, base station 2 (1f-03) can transmit cell common settings, such as SBFD-related TDD / FDD settings, to base station 1 (1f-02). More specifically, the following settings may be provided to base station 1 (1f-02).

[0124] - Information made possible by extending existing serving cell information (e.g., Served Cell Information NR IE)

[0125] ■ TDD Information, Setting the Time and Frequency Position of SBFD

[0126] ■ Measurement timing configuration: Configured using the MeasurementTimingConfiguration IE in inter-node RRC messages (e.g., ssb-ToMeasure, NZP CSI-RS related settings)

[0127] - New serving cell information

[0128] ■ Best downlink beam information (beam information for SSB / CSI-RS): May include information on one or multiple beams.

[0129] ■ Information requesting CLI mitigation (this can be a 1-bit requesting a CLI function, or specifically, CLI mitigation can be requested through functions such as PDSCH muting or Dynamic TDD scheduling.)

[0130] According to an embodiment, serving cell information for the above SBFD can be requested through XN Setup Request / Response messages such as 1f-05 and 1f-10, and the corresponding setting value can be included in the response and transmitted to serving cell 1 (1f-02). The above serving cell information can be transmitted to base station 1 (1f-02) and base station 2 (1f-03) by including cell information in each of the XN Setup Request and XN Setup Response messages. Alternatively, the XN Setup Request information may only include request information, and the XN Setup Response message may include serving cell information of the corresponding cell and be responded to base station 1 (1f-02).

[0131] In addition, as described above, this procedure can be used for the initial exchange of cell information between base stations via XN Setup Request / Response messages, but it can also be performed via NG-RAN NODE CONFIGURATION UPDATE / NG-RAN NODE CONFIGURATION UPDATE ACKNOWLEDGE messages between base station 1 (NG-RAN node 1) (1f-02) and base station 2 (NG-RAN node 2) (1f-03), as in steps 1f-100 and 1f-105. In this case, this procedure can be triggered at any time if necessary to update settings between base stations in addition to sharing initial cell settings between them.

[0132] Alternatively, the existing serving cell information (TDD information, measurement timing settings) described above may be transmitted through the XN Setup Request / Response message transmission / reception procedure or the NODE CONFIGURATION UPDATE / NODE CONFIGURATION UPDATE ACKNOWLEDGE message transmission / reception procedure, and new serving cell information (best downlink beam information, information requesting CLI mitigation) may be transmitted by defining a separate new message. For example, as in step 1f-110, if the information does not require a request and response from serving cell 1 (base station 1) (1f-02) to serving cell 2 (base station 2) (1f-03), base station 1 (1f-02) may include the information in a unidirectional message (e.g., an SBFD REPORT message) and transmit it to base station 2 (1f-03). In this case, the information may be triggered independently of the message of the bidirectional procedure described above.

[0133] To explain one example of the overall operation of the embodiment, a terminal (1f-01) in an RRC IDLE state can camp on to cell 1 (1f-02) and receive system information from the cell. For example, in step 1f-15, the terminal (1f-01) can receive SIB1 (system information block 1) from cell 1 (1f-02). The SIB1 may include 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 UL / DL, and a random access configuration for the legacy UE and SBFD UE.

[0134] In step 1f-20, the terminal (1f-01) applies the settings in SIB1 received from cell 1 (1f-02) and can verify random access operations by combining SBFD resource setting information and random access settings. The terminal (1f-01) can basically apply SBFD resource usage and random access operations while following the operation of the UL / DL resource slots within the TDD broadcast in SIB1. For example, if the TDD resource settings and the SBFD resource settings match, the terminal (1f-01) can perform PDCCH monitoring operations on the DL resources in the corresponding SBFD slot and the DL resources in the non-SBFD slot. Additionally, the terminal (1f-01) can perform uplink transmission on the UL resources in the corresponding SBFD slot and the UL resources in the non-SBFD slot.

[0135] In step 1f-25, the terminal (1f-01) can perform a random access preamble transmission based on the SBFD random access setting information in SIB1 received from cell 1 (1f-02). The random access procedure may be a CBRA (contention based random access) operation based on the SBFD setting.

[0136] In step 1f-30, the terminal (1f-01) can receive a random access response (RAR) message from cell 1 (1f-02). This operation can also be based on the SBFD settings received from SIB1.

[0137] In step 1f-35, the terminal (1f-01) can apply the received RAR information (TA, UL grant, Temporary C-RNTI) and send an RRCSetupRequest message to cell 1 (1f-02).

[0138] In step 1f-40, the terminal (1f-01) can receive an RRCSetup message from cell 1 (1f-10) in response to the RRCSetupRequest message transmitted to cell 1 (1f-02).

[0139] In step 1f-45, the terminal (1f-01) can send an RRCSetupComplete message to cell 1 (1f-02) and transition to an RRC connection state.

[0140] Additionally, in subsequent steps 1f-50 and 1f-55, for example, if Dual Connectivity (DC) is supported between base stations, Cell 1 (1f-02) may request configuration information for CLI resources in a neighboring cell (e.g., Cell 2 (1f-03)) via an inter-node RRC message or Xn / F1 message between base stations (step 1f-50), and in response, Cell 2 (1f-03) may send a response message (step 1f-55) to Cell 1 (1f-02). Considering the scenario described in FIG. 1e, Base Station 1 (1f-02) and Base Station 2 (1f-03) may transmit CLI configuration information affecting the terminal (1f-01) to neighboring cells. For example, in step 1f-50, base station 1 (1f-02) requests CLI resource (SRS-RSRP and CLI-RSSI) configuration information from base station 2 (1f-03), and in step 1f-55, base station 2 (1f-03) can transmit the relevant CLI resource (SRS-RSRP and CLI-RSSI) configuration information to base station 1 (1f-02) in response. Upon receiving this, base station 1 (1f-02) can apply a technique to mitigate the SBFD CLI (dynamic UL scheduling and configuration update, PDSCH mutting) to the terminal (1f-01) in the cell based on the information. Base station 2 (1f-03) transmits the CLI measurement resource setting information of the present invention to base station 1 (1f-02), and base station 1 (1f-02) can transmit the information to a terminal (1f-01) based on the active downlink BWP (DL active BWP (bandwidth part)) of base station 1 (1f-02), only the settings within the BWP. To this end, base station 1 (1f-02) and base station 2 (1f-03) may propose the following methods for transmitting and setting CLI resource information.

[0141] - Method for sharing 1st SBFD CLI resource settings: Each base station / serving cell transmits the CLI resource information from its own cell to neighboring base stations / serving cells as is.

[0142] ■ The source base station (base station 1 (1f-02); serving cell 1) changes the SBFD CLI resource setting within the DL active BWP in the corresponding source base station (1f-02) based on the actual CLI resource setting information received from the surrounding base station (base station 2 (1f-03); serving cell 2), and provides a valid setting to the terminal (1f-01).

[0143] - Method for sharing 2nd SBFD CLI resource settings: Each base station / serving cell transmits valid SBFD CLI resource information within the corresponding BWP to surrounding base stations / serving cells based on the active BWP band information provided by surrounding cells (i.e., setting information for the actual CLI resource is transmitted).

[0144] ■ The source base station (base station 1 (1f-02); serving cell 1) first provides the surrounding base station (base station 2 (1f-03); serving cell 2) with the current DL active BWP information of the source base station (1f-02) and requests CLI resource configuration to match the corresponding band.

[0145] ■ The surrounding base station (base station 2 (1f-03); serving cell 2) provides valid CLI resource configuration information within the corresponding band (DL active BWP) to the source base station (1f-02) in response to a request from the source base station (1f-02).

[0146] This method allows for configuration by dynamically reflecting configuration information, but the signaling burden may increase.

[0147] If DC is additionally supported in steps 1f-50 and 1f-55 above, the number of CLI resources (SRS, CLI-RSSI) can be mutually coordinated between the MN (master node) and SN (secondary node) via inter-node RRC. For example, the MN can inform the SN of the number of CLI resources it configures and transmit the maximum number of CLI resources that can be configured simultaneously to the SN. Based on the above information, the SN can transmit the CLI configuration information configured by the SN to the MN. In the above procedure, if the SN requires more CLI resource configurations, the SN responds including information requesting this from the MN, and the MN can reflect this and notify the SN again of the number of CLI resources it configures. Instead of the number of CLI resources used by the MN, the number of CLI resources allowed to the SN may also be transmitted. All of this information can be determined based on terminal capabilities.

[0148] Subsequently, in step 1f-60, the serving cell (cell 1, base station 1) (1f-02) may transmit RRC configuration information to the terminal (1f-01). For example, an RRC reconfiguration message may be transmitted to the terminal (1f-01). The configuration information may include SBFD-related resources and SBFD random access settings. This is a setting for SBFD support in an RRC connected state and may be the same as or different from the settings transmitted in SIB1 in step 1f-15. For example, the SBFD resource configuration information may be semi-static for the cell, in which case it may be the same as the settings in SIB1. On the other hand, in the case of SBFD RACH settings, there may be differences because the SBFD RACH settings for a terminal in an RRC IDLE state and the SBFD RACH settings for a terminal in an RRC connected state may be different. In addition, the above settings may include settings for CLI resources and settings for CLI resource reporting, which are mainly proposed in the present invention. This is a CLI resource configuration and reporting configuration, particularly in an SBFD slot, and unlike the existing layer 3-based CLI resource configuration and reporting configuration, it may be in the form of a layer 1-based CLI resource configuration and reporting configuration.

[0149] Regarding CLI resource configuration, it follows the method used for configuring existing Layer 1 CSI resources, and new CLI measurement resource sets can be added to the configuration. Specifically, CLI measurement resource set lists exist within the CSI-ResourceConfig IE, and SRS-RSRP and CLI-RSSI resources can be configured within these resource sets. More specifically, SRS-RSRP and CLI-RSSI resources may be configured simultaneously within a single CLI measurement resource set, or only one of the two resource types (SRS-RSRP and CLI-RSSI) may be configured within a single CLI measurement resource set. Additionally, each SRS-RSRP and CLI-RSSI resource configuration can be periodic, semi-persistent, or aperioditic.

[0150] Furthermore, regarding CLI resource reporting settings, the configuration is based on at least one-time reporting (aperiodic CLI reporting) by default, and periodic and semi-periodic reporting may be included if necessary. For reference, since settings related to CLI aperiodic triggering states can be supported as an extension of the existing CSI-AssociatedReportConfigInfo, the MAC (medium access control) CE (control element) (Aperiodic CSI Trigger State Subselection MAC CE) that previously enabled CSI aperiodic triggering states can be used directly in the CLI case. In other words, specific states from the list of aperiodic triggering states can be associated with CLI resources and CLI aperiodic reporting settings, and this index can be activated directly using the existing MAC CE.

[0151] In step 1f-65, base station 1 (1f-02) can transmit a signal to terminal (1f-01) instructing the activation of CLI resources (SRS-RSRP, CLI-RSSI) configured on other terminals. As described above, CLI resources can be configured. If a periodic CLI resource is configured, the terminal (1f-01) can measure it immediately; however, if it is a semi-persistent CLI resource or an aperiodic CLI resource, separate signaling to activate the CLI resource may be required. For semi-persistent CLI resources, MAC CE that activates the corresponding CLI resource can be introduced to enable / deactivate it. Additionally, in the case of an aperiodic CLI resource, DCI (downlink control information) that activates the corresponding resource can be used. This may be in the form of including the corresponding CSI resource configuration index to indicate the activation of the resource and adding a bit to enable / deactivate it, or the existing DCI field may be expanded for signaling, or a new DCI may be introduced and used.

[0152] In step 1f-70, the terminal (1f-01) can perform measurements on the CLI resources that are set / instructed according to the CLI resource setting and activation signal. In step 1f-75, base station 1 (1f-02) can transmit a MAC CE to the terminal (1f-01) that activates the current aperiodic triggering state for the report settings in which the aperiodic CLI resource report is actually set for the resources being measured, thereby instructing the terminal (1f-01) on which aperiodic report setting is currently activated.

[0153] In step 1f-80, the base station (1f-02) can request a CLI report from the terminal (1f-01) via DCI for an aperiodic resource report setting that requires an actual CLI report.

[0154] In step 1f-85, the terminal (1f-01) may report CLI measurement values ​​associated with the corresponding CLI report to the base station (1f-02) according to the information (report setting index and reporting instruction) included in the DCI. The measurement values ​​may be stored in the UCI (uplink control information) via PUSCH and reported. Alternatively, a new MAC CE may be introduced to report the measurement values. The contents included in the report may be at least one of the following: a CSI resource setting index (CLI resource set id and resource id for each resource type), a resource type (SRS-RSRP, CSL-RSSI), and a measurement value (SRS-RSRP or CSL-RSSI).

[0155] In step 1f-90, the serving cell (1f-02) determines UL / DL scheduling based on the TDD resource information and SBFD resource settings configured for the terminal (1f-01), and in step 1f-95, transmits signaling (DCI; downlink control information) containing the scheduling to the terminal (1f-01).

[0156] In step 1f-95, the terminal (1f-01) can perform downlink PDSCH reception and uplink PUCCH and PUSCH transmission according to the instructed scheduling information.

[0157] FIG. 1g is a diagram illustrating the overall terminal operation of performing CLI measurements using SBFD resources according to one embodiment of the present invention.

[0158] Referring to FIG. 1g, in step 1g-05, the terminal can receive SBFD resources and SBFD random access settings from system information (SIB1) broadcast by the base station. The settings may be provided such as TDD UL / DL resource slot settings and may be provided to satisfy validity between the settings and SBFD. For detailed operation, refer to the TDD UL / DL resource settings and SBFD settings in FIG. 1c and FIG. 1d.

[0159] In the 1g-10 stage, the terminal establishes an RRC connection procedure with the base station, and if SIB1 includes an SBFD random access setting, it can perform random access through SBFD resources accordingly. Alternatively, if SIB1 does not have an SBFD random access setting or if the SBFD random access conditions are not satisfied, the terminal can perform the existing random access procedure.

[0160] In the 1g-15 stage, the terminal can receive CLI measurement and reporting settings through SBFD resources as RRC settings from the base station.

[0161] Subsequently, in the 1g-20 stage, the terminal may receive activation and deactivation instruction signals from the base station for CLI resources, specifically semi-persistent and aperiodic CLI resources. For semi-persistent CLI resources, MAC CE may be used, and for aperiodic CLI resources, DCI may be used to instruct activation / deactivation.

[0162] In the 1g-25 stage, the terminal can receive an aperiodic CLI measurement report command from the base station. The aperiodic CLI measurement report command can be received via DCI.

[0163] And, in the 1g-30 stage, the terminal can report CLI measurement results to the base station according to the measurement report settings.

[0164] In the 1g-35 stage, the terminal can perform data transmission and reception through SBFD resources.

[0165] FIG. 1h is a drawing illustrating the operation of a base station according to an embodiment of the present invention.

[0166] Referring to FIG. 1h, in step 1h-05, the base station may broadcast system information (SIB1) including SBFD resources and SBFD random access settings. These settings may be provided along with TDD UL / DL resource slot settings and may be provided to satisfy validity between these settings and SBFD. For detailed operation, refer to the TDD UL / DL resource settings and SBFD settings in FIG. 1c and 1d. Additionally, prior to step 1h-05, SBFD-related cell setting information may be shared between base stations, and the serving base station may provide SBFD-related settings to the SIB by taking into account the information received from neighboring base stations.

[0167] In step 1h-10, the terminal can utilize SBFD resources in the RRC connection procedure, and the base station can also perform a random access procedure in response.

[0168] In steps 1h-15, the base station may collect terminal capabilities from a connected terminal. The terminal capability report may include SBFD-related terminal capabilities. That is, the terminal capability report may include CLI-related terminal capabilities (CLI measurement and reporting, and processing capabilities by resource may also be reported). Such capabilities may be provided per terminal or per band (TDD band). Alternatively, SBFD random access-related capabilities may be reported to the base station separately, and this may also be provided per terminal or per band (TDD band). Alternatively, the terminal capabilities may be delivered included in a Feature Combination.

[0169] In step 1h-20, the base station may set SBFD-related settings and transmit them to the terminal as an RRC setting message. The RRC setting message may include CLI measurement resources and reporting settings. In step 1h-20, the source base station may update valid CLI resource settings, etc., through information exchange with neighboring base stations, and the information may be transmitted to the terminal.

[0170] Subsequently, in step 1h-25, the base station may instruct the terminal to use CLI measurement resources and trigger an aperiodic report. The base station may transmit activation and deactivation instruction signals for semi-persistent and aperiodic CLI resources to the terminal. For semi-persistent CLI resources, MAC CE may be used, and for aperiodic CLI resources, DCI may be used to instruct activation / deactivation. Additionally, the base station may transmit an aperiodic CLI measurement report command to the terminal. The aperiodic CLI measurement report command may be transmitted via DCI.

[0171] In step 1h-30, the base station can receive CLI measurement reports from the terminal.

[0172] In step 1h-35, the base station can update the settings for in-cell interference control according to the CLI settings based on the CLI measurement report received from the terminal, or improve SBFD operation by sharing information with neighboring cells.

[0173] FIG. 1i is a block diagram illustrating the internal structure of a terminal according to one embodiment of the present invention.

[0174] Referring to FIG. 1i, the terminal may include an RF (Radio Frequency) processing unit (1i-10), a baseband processing unit (1i-20), a storage unit (1i-30), a control unit (1i-40), etc.

[0175] The RF processing unit (1i-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 (1i-10) up-converts the baseband signal provided by the baseband processing unit (1i-20) into an RF band signal and 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 (1i-10) may include a transmit filter, a receive 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 (1i-10) may include multiple RF chains. Furthermore, the RF processing unit (1i-10) may perform beamforming. For the above beamforming, the RF processing unit (1i-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.

[0176] The baseband processing unit (1i-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 (1i-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1i-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1i-10). For example, in the case of following the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processing unit (1i-20) generates complex symbols by encoding and modulating the transmitted bit sequence, maps the complex symbols to subcarriers, and then constructs OFDM symbols through inverse fast Fourier transform (IFFT) operations and cyclic prefix (CP) insertion. Additionally, upon receiving data, the baseband processing unit (1i-20) divides the baseband signal provided by the RF processing unit (1i-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.

[0177] The baseband processing unit (1i-20) and the RF processing unit (1i-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1i-20) and the RF processing unit (1i-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 (1i-20) and the RF processing unit (1i-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 (1i-20) and the RF processing unit (1i-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.

[0178] The storage unit (1i-30) stores data such as basic programs, application programs, and configuration information for the operation of the terminal. In particular, the storage unit (1i-30) can store information related to a second connection node that performs wireless communication using a second wireless connection technology. Additionally, the storage unit (1i-30) provides the stored data upon a request from the control unit (1i-40).

[0179] The control unit (1i-40) controls the overall operations of the terminal. For example, the control unit (1i-40) transmits and receives signals through the baseband processing unit (1i-20) and the RF processing unit (1i-10). Additionally, the control unit (1i-40) writes and reads data to and from the storage unit (1i-40). To this end, the control unit (1i-40) may include at least one processor. For example, the control unit (1i-40) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as applications.

[0180] FIG. 1j is a block diagram showing the configuration of a base station according to one embodiment of the present invention.

[0181] As illustrated in FIG. 1j, the base station may include an RF processing unit (1j-10), a baseband processing unit (1j-20), a backhaul communication unit (1j-30), a storage unit (1j-40), a control unit (1j-50), etc.

[0182] The RF processing unit (1j-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 (1j-10) up-converts the baseband signal provided by the baseband processing unit (1j-20) into an RF band signal and 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 (1j-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 (1j-10) may include multiple RF chains. Furthermore, the RF processing unit (1j-10) may perform beamforming. For the above beamforming, the RF processing unit (1j-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.

[0183] The baseband processing unit (1j-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 (1j-20) generates complex symbols by encoding and modulating the transmitted bit sequence. Additionally, when receiving data, the baseband processing unit (1j-20) restores the received bit sequence by demodulating and decoding the baseband signal provided by the RF processing unit (1j-10). For example, in the case of following the OFDM method, when transmitting data, the baseband processing unit (1j-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 (1j-20) divides the baseband signal provided by the RF processing unit (1j-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 (1j-20) and the RF processing unit (1j-10) transmit and receive signals as described above. Accordingly, the baseband processing unit (1j-20) and the RF processing unit (1j-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.

[0184] The backhaul communication unit (1j-30) provides an interface for communicating with other nodes within the network. That is, the backhaul communication unit (1j-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.

[0185] The storage unit (1j-40) stores data such as basic programs, application programs, and configuration information for the operation of the base station. In particular, the storage unit (1j-40) can store information regarding a bearer assigned to a connected terminal, measurement results reported by the connected terminal, etc. Additionally, the storage unit (1j-40) can store information that serves as a criterion for determining whether to provide or disconnect multiple connections to the terminal. Furthermore, the storage unit (1j-40) provides the stored data upon the request of the control unit (1j-50).

[0186] The control unit (1j-50) controls the overall operations of the base station. For example, the control unit (1j-50) transmits and receives signals through the baseband processing unit (1j-20) and the RF processing unit (1j-10) or through the backhaul communication unit (1j-30). Additionally, the control unit (1j-50) writes and reads data to and from the storage unit (1j-40). To this end, the control unit (1j-50) may include at least one processor.

[0187] Methods according to the embodiments described in the claims or specification of the present invention may be implemented in the form of hardware, software, or a combination of hardware and software.

[0188] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. One or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present invention.

[0189] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0190] In addition, the above program may be stored on an attachable storage device that can be accessed via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present invention through an external port. Additionally, a separate storage device on a communication network may be connected to a device performing an embodiment of the present invention.

[0191] In the specific embodiments of the present invention described above, the components included in the invention are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present invention is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed in the singular form, or even if a component is expressed in the singular form, it may be composed in the plural form.

[0192] Meanwhile, although specific embodiments have been described in the detailed description of the present invention, it is understood that various modifications are possible within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. A method performed by a base station of a wireless communication system, A step of transmitting a first message to at least one surrounding base station for receiving configuration information regarding a resource associated with cross-link interference (CLI) of at least one surrounding base station; A step of receiving a second message from the at least one peripheral base station, the message including configuration information for a resource associated with the CLI of the at least one peripheral base station; and A method comprising the step of transmitting to a terminal a third message containing CLI resource configuration information associated with a subband full duplex (SBFD) determined based on configuration information for a resource associated with the CLI of at least one surrounding base station.

2. In Paragraph 1, A method characterized in that the configuration information for a resource associated with the CLI of at least one surrounding base station includes the configuration information for a sounding reference signal (SRS) resource of at least one surrounding base station.

3. In Paragraph 1, A method characterized in that the first message and the second message are transmitted via an Xn message or an F1 message.

4. In Paragraph 1, A method characterized in that the CLI resource configuration information associated with the above SBFD includes information regarding resources included in the active BWP (bandwith part) of the base station among the resources associated with the CLI according to the configuration information for resources associated with the CLI of at least one surrounding base station.

5. In Paragraph 1, A method characterized in that the CLI resource setting information associated with the above SBFD includes at least one of SRS-RSRP (SRS received signal received power) resource setting information and CLI-RSSI (CLI received signal strength indicator) resource setting information.

6. A method performed by a terminal of a wireless communication system, A step of receiving from a base station a third message comprising CLI resource configuration information associated with a subband full duplex (SBFD) determined based on configuration information for a resource associated with cross link interference (CLI) of at least one surrounding base station; and A method comprising the step of reporting a measured result to the base station based on CLI resource configuration information associated with the above SBFD.

7. In Paragraph 6, A method characterized in that the CLI resource configuration information associated with the above SBFD includes information regarding resources included in the active BWP (bandwith part) of the base station among the resources associated with the CLI according to the configuration information for resources associated with the CLI of at least one surrounding base station.

8. In Paragraph 6, A method characterized in that the CLI resource setting information associated with the above SBFD includes at least one of SRS-RSRP (SRS received signal received power) resource setting information and CLI-RSSI (CLI received signal strength indicator) resource setting information.

9. In a base station of a wireless communication system, Transmitter / receiver; and Connected to the above-mentioned transmitting and receiving unit, Transmitting a first message to at least one surrounding base station for receiving configuration information regarding a resource associated with cross-link interference (CLI) of at least one surrounding base station, and A second message including configuration information for a resource associated with the CLI of the at least one surrounding base station is received from the at least one surrounding base station, and A base station comprising a control unit that transmits to a terminal a third message including CLI resource setting information associated with a subband full duplex (SBFD) determined based on setting information for a resource associated with the CLI of at least one surrounding base station.

10. In Paragraph 9, A base station characterized in that the configuration information for resources associated with the CLI of at least one surrounding base station includes the configuration information for the SRS (sounding reference signal) resources of at least one surrounding base station.

11. In Paragraph 9, A base station characterized in that the first message and the second message are transmitted via an Xn message or an F1 message.

12. In Paragraph 9, A base station characterized in that the CLI resource configuration information associated with the above SBFD includes information regarding resources included in the active BWP (bandwith part) of the base station among the resources associated with the CLI according to the configuration information for resources associated with the CLI of at least one surrounding base station.

13. In Paragraph 9, A base station characterized by the CLI resource setting information associated with the above SBFD including at least one of SRS-RSRP (SRS received signal received power) resource setting information and CLI-RSSI (CLI received signal strength indicator) resource setting information.

14. In a terminal of a wireless communication system, Transmitter / receiver; and Connected to the above-mentioned transmitting and receiving unit, A third message is received from a base station comprising CLI resource configuration information associated with a subband full duplex (SBFD) determined based on configuration information for a resource associated with cross link interference (CLI) of at least one surrounding base station, and A terminal comprising a control unit that reports a measured result to the base station based on CLI resource configuration information associated with the above SBFD.

15. In Paragraph 14, The CLI resource configuration information associated with the above SBFD includes information regarding resources included in the active BWP (bandwith part) of the base station among the CLI resources according to the configuration information for resources associated with the CLI of at least one surrounding base station. A terminal characterized in that the CLI resource configuration information associated with the above SBFD includes at least one of SRS-RSRP (SRS received signal received power) resource configuration information and CLI-RSSI (CLI received signal strength indicator) resource configuration information.

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