Method and apparatus for measuring interference between terminals in full duplex communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to various embodiments of the present disclosure, a method performed by a terminal supporting a full duplex (FD) system in a wireless communication system may comprise the steps of: receiving, from a base station, an allocation of resources for receiving at least one cross-linked interference reference signal (CLI-RS); determining at least one CLI-RS receiving beam from the plurality of available beams based on the allocated resources; receiving the CLI-RS from the at least one other terminal based on the at least one CLI-RS reception beam; measuring interference with at least one other terminal based on the received CLI-RS; transmitting measurement information generated based on the measurement result to the base station; receiving joint scheduling information from the base station according to a downlink reception beam determined based on the measurement information; and receiving a downlink signal from the base station through a downlink reception beam determined based on the joint scheduling information.

Description

Technical Field

[0001] The present disclosure relates generally to a wireless communication system, and more particularly to an apparatus and method for effectively measuring interference between terminals in a full-duplex (FD) communication system. Background Art

[0002] Considering the development of wireless communication from generation to generation, technologies mainly used for services for humans, such as voice calls, multimedia services and data services, have been developed. After the commercialization of 5G (5th generation) communication systems, it is expected that the number of connected devices will grow exponentially. These will be increasingly connected to communication networks. Examples of networked things can include vehicles, robots, drones, household appliances, displays, smart sensors connected to various infrastructures, construction machinery and factory equipment. Mobile devices are expected to evolve in various form factors such as augmented reality glasses, virtual reality headsets and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6G (6th generation) area, efforts have been made to develop improved 6G communication systems. For these reasons, 6G communication systems are called super 5G systems.

[0003] The 6G communication system, which is expected to be commercialized around 2030, will have a peak data rate of terabit (1,000 gigabits) bits per second (bps) and a radio latency of less than 100 μsec, and will therefore be 50 times faster than the 5G communication system and have 1 / 10 of its radio latency.

[0004] In order to achieve such high data rates and ultra-low latency, it has been considered to implement 6G communication systems in the terahertz (THz) band (e.g., 95 gigahertz (GHz) to 3THz band). It is expected that since the path loss and atmospheric absorption in the terahertz band are more serious than in the millimeter wave band introduced in 5G, the technology to ensure the signal transmission distance (that is, coverage) will become more critical. As the main technology to ensure coverage, it is necessary to develop: radio frequency (RF) elements, antennas, new waveforms with better coverage than orthogonal frequency division multiplexing (OFDM) schemes, beamforming and large-scale multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and multi-antenna transmission technologies such as large-scale antennas. In addition, new technologies for improving the coverage of terahertz band signals have been discussed, such as lenses and antennas based on metamaterials, orbital angular momentum (OAM), and reconfigurable smart surfaces (RIS).

[0005] In addition, in order to improve spectrum efficiency and overall network performance, the following technologies for 6G communication systems have been developed: full-duplex technology for realizing uplink transmission and downlink transmission to use the same frequency resources simultaneously at the same time; network technology for utilizing satellites, high altitude platform stations (HAPS), etc. in an integrated manner; improved network structure for supporting mobile base stations, etc. and realizing network operation optimization and automation, etc.; dynamic spectrum sharing technology based on prediction of spectrum use through conflict avoidance; use of artificial intelligence (AI) in wireless communication to improve overall network operation by utilizing AI from the design stage of developing 6G and internalizing end-to-end AI support functions; next-generation distributed computing technology for overcoming the limits of UE computing power through achievable ultra-high performance communications and computing resources on the network (such as mobile edge computing (MEC), cloud, etc.). In addition, attempts continue to be made to strengthen connectivity between devices, optimize networks, promote softwareization of network entities, and improve the openness of wireless communications by designing new protocols to be used in 6G communication networks, developing mechanisms for realizing hardware-based security environments and secure use of data, and developing technologies for maintaining privacy.

[0006] It is expected that research and development of hyper-connected 6G communication systems, including human-to-machine (P2M) and machine-to-machine (M2M), will enable the next hyper-connected experience. In particular, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas can be provided through 6G communication systems. In addition, services such as remote surgery with enhanced safety and reliability, industrial automation, and emergency response will be provided through 6G communication systems, making it possible to apply technology in various fields such as industry, medical care, automobiles, and household appliances.

[0007] Specifically, in a system using the recent full-duplex (FD) technology that allows uplink (UL) and downlink (DL) to use the same frequency resources at the same time, a base station can simultaneously transmit UL to multiple terminals and receive DL from multiple terminals. However, since the same frequency resources are used at the same time, each of the UL signal and the DL signal can be transmitted or received in an overlapping resource area, and each signal using the overlapping resource area may interfere with each other. The interference occurring between terminals in an FD system can be referred to as cross-link interference (CLI). In order to solve the above problems and achieve smooth communication between a base station and multiple terminals, various technologies are being considered to minimize CLI between terminals. Summary of the invention

[0008] Technical issues

[0009] Based on the above discussion, the present disclosure is intended to provide an apparatus and method capable of effectively performing signal transmission and reception in a wireless communication system.

[0010] More specifically, the present disclosure provides an apparatus and method for measuring a beam that minimizes interference between terminals and determining the beam as a beam for downlink or uplink data transmission and reception in a full-duplex (FD) system.

[0011] Technical Solution

[0012] According to various embodiments of the present disclosure, a method performed by a terminal supporting a full-duplex (FD) system in a wireless communication system may include: receiving an allocation of resources for receiving at least one cross-linked interference reference signal (CLI-RS) from a base station; determining at least one CLI-RS receiving beam from multiple available beams based on the allocated resources; receiving the CLI-RS from at least one other terminal based on the at least one CLI-RS receiving beam; measuring interference with at least one other terminal based on the received CLI-RS; transmitting measurement information generated based on the measurement result to the base station; receiving coordinated scheduling information from the base station according to the downlink receiving beam determined based on the measurement information; and receiving a downlink signal from the base station via the downlink receiving beam determined based on the coordinated scheduling information.

[0013] According to various embodiments of the present disclosure, a method performed by a base station supporting a full-duplex (FD) system in a wireless communication system may include: allocating resources for receiving at least one cross-linked interference reference signal (CLI-RS) to a first terminal, and allocating resources for transmitting at least one CLI-RS to a second terminal; receiving a CLI-RS measurement report from the first terminal; determining a first beam for downlink reception of the first terminal and a second beam for uplink transmission of the second terminal based on the CLI-RS measurement report; providing coordinated scheduling information of the first terminal and the second terminal to the first terminal and the second terminal based on information about the determined first beam and second beam; and transmitting a downlink signal to the first terminal and receiving an uplink signal from the second terminal based on the coordinated scheduling information.

[0014] According to various embodiments of the present disclosure, a terminal supporting a full-duplex (FD) system in a wireless communication system may include at least one transceiver and at least one processor functionally connected to the at least one transceiver, wherein the at least one processor is configured to: receive an allocation of resources for receiving at least one cross-linked interference reference signal (CLI-RS) from a base station; determine at least one CLI-RS receiving beam from multiple available beams based on the allocated resources; receive the CLI-RS from at least one other terminal based on the at least one CLI-RS receiving beam; measure interference with at least one other terminal based on the received CLI-RS; transmit measurement information generated based on the measurement result to the base station; receive coordinated scheduling information from the base station according to the downlink receiving beam determined based on the measurement information; and receive a downlink signal from the base station via the downlink receiving beam determined based on the coordinated scheduling information.

[0015] According to various embodiments of the present disclosure, a base station supporting a full-duplex (FD) system in a wireless communication system may include at least one transceiver and at least one processor functionally connected to the at least one transceiver, wherein the at least one processor is configured to: allocate resources for receiving at least one cross-linked interference reference signal (CLI-RS) to a first terminal, and allocate resources for transmitting at least one CLI-RS to a second terminal; receive a CLI-RS measurement report from the first terminal; determine a first beam for downlink reception of the first terminal and a second beam for uplink transmission of the second terminal based on the CLI-RS measurement report; provide coordinated scheduling information of the first terminal and the second terminal to the first terminal and the second terminal based on information about the determined first beam and second beam; and transmit a downlink signal to the first terminal and receive an uplink signal from the second terminal based on the coordinated scheduling information.

[0016] Advantageous Effects of the Invention

[0017] The present disclosure provides an apparatus and method capable of effectively providing a service in a wireless communication system.

[0018] The present disclosure provides an apparatus and method capable of performing efficient signal transmission and reception in a wireless communication system.

[0019] Advantageous effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those skilled in the art to which the present disclosure pertains through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A wireless environment network in a wireless communication system according to various embodiments of the present disclosure is shown;

[0021] Figure 2The functional structure of a base station in a wireless communication system according to various embodiments of the present disclosure is shown;

[0022] Figure 3 The functional structure of a UE in a wireless communication system according to various embodiments of the present disclosure is shown;

[0023] Figure 4 The specific structure of a communication unit of a base station or a UE in a wireless communication system according to various embodiments of the present disclosure is shown;

[0024] Figure 5 An example of a full-duplex (FD) base station communication environment and cross-link interference (CLI) in a wireless communication system according to various embodiments of the present disclosure is shown;

[0025] Figure 6 An example of measuring interference between multiple UEs and data channel scheduling based on the measurement in an FD system according to various embodiments of the present disclosure is shown;

[0026] Figure 7 A signal flow for measuring interference between a base station and a plurality of UEs and data scheduling based on the measurement in an FD system according to various embodiments of the present disclosure is shown;

[0027] Figures 8a to 8e Various examples of resource allocation for transmission and reception of a base station according to various embodiments of the present disclosure are shown;

[0028] Fig. 9 The following is a flow chart showing a UE operation process of receiving allocation of resources for transmission and reception from a base station in an FD system in order to measure and report interference according to various embodiments of the present disclosure;

[0029] Fig.10 shows a signal flow for single beam based interference measurement and reporting according to various embodiments of the present disclosure;

[0030] Fig.11a and Fig.11b An example of single beam determination for interference measurement according to various embodiments of the present disclosure is shown;

[0031] Fig.12 The UE operation flow of single-beam based interference measurement and reporting according to various embodiments of the present disclosure is shown;

[0032] Fig.13 shows a signal flow for multi-beam based interference measurement and reporting according to various embodiments of the present disclosure;

[0033] Fig.14a and Fig.14b An example of determining a multi-beam for interference measurement according to various embodiments of the present disclosure is shown;

[0034] Fig.15 An example of measuring interference via multi-beam based beam scanning according to various embodiments of the present disclosure is shown;

[0035] Fig.16 The UE operation flow of multi-beam based interference measurement and reporting according to various embodiments of the present disclosure is shown;

[0036] Fig.17 shows signal flows for scheduling data channel transmission and reception based on interference measurements according to various embodiments of the present disclosure; and

[0037] Fig.18 The operation flow of a base station for receiving an interference measurement report from a UE and performing scheduling in an FD system according to various embodiments of the present disclosure is shown. DETAILED DESCRIPTION

[0038] The terms used in the present disclosure are only used to describe specific embodiments, and may not be intended to limit the scope of other embodiments. Unless absolutely different in context, singular expressions may include plural expressions. Terms used herein (including technical and scientific terms) may have the same meaning as the meanings generally understood by those skilled in the art to which the present disclosure belongs. These terms defined in commonly used dictionaries may be interpreted as having the same meaning as the contextual meanings in the relevant art, and unless clearly defined in the present disclosure, should not be interpreted as having ideal or overly formal meanings. In some cases, even the terms defined in the present disclosure should not be interpreted as excluding embodiments of the present disclosure.

[0039] Hereinafter, various embodiments of the present disclosure will be described based on a hardware approach. However, various embodiments of the present disclosure include technologies using both hardware and software, and therefore various embodiments of the present disclosure may not exclude the software perspective. In addition, terms referring to network entities, terms referring to device elements, etc. are only used illustratively for the convenience of description. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to themes with equivalent technical meanings may be used.

[0040] In addition, the various embodiments of the present disclosure will be described using terms adopted in some communication standards (e.g., 3rd Generation Partnership Project (3GPP) and European Telecommunications Standards Institute (ETSI)), but they are for illustrative purposes only. The various embodiments of the present disclosure can be easily applied to other communication systems by modification.

[0041] In the present disclosure, the expression "greater than" or "less than" may be used to determine whether a specific condition is satisfied or achieved, but is intended only to show examples, and does not exclude "greater than or equal to" or "equal to or less than." A condition expressed by the expression "greater than or equal to" may be replaced by a condition expressed by "greater than," a condition expressed by the expression "equal to or less than" may be replaced by a condition expressed by "less than," and a condition expressed by "greater than, equal to, or less than" may be replaced by a condition expressed by "greater than and less than."

[0042] In the following description, for the convenience of description, signal-related terms, channel-related terms, control information-related terms, network entity-related terms, device element-related terms, etc. are illustratively used. Therefore, the present disclosure is not limited to the terms described below, and other terms referring to subjects with equivalent technical meanings may be used.

[0043] Figure 1 A wireless environment network in a wireless communication system according to various embodiments of the present disclosure is shown. Figure 1 The base station 110, the first UE 120, and the second UE 130 are shown as node parts using a radio channel in a wireless communication system. Figure 1 Only one base station is shown, but another base station that is the same as or similar to base station 110 may also be included.

[0044] The base station 110 is a network infrastructure that provides radio access to the UEs 120 and 130. The base station 110 has a coverage area that is defined as a predetermined geographical area based on the distance at which a signal can be transmitted. The base station 110 may be referred to not only as a “base station” but also as an “access point (AP)”, “eNodeB (eNB)”, “5th generation node (5G node)”, “next generation nodeB (gNB)”, “radio point”, “transmission / reception point (TRP)”, or other terms having equivalent technical meanings.

[0045] Each of the first UE 120 and the second UE 130 is a device used by a user, and performs communication with the base station 110 via a radio channel. In some cases, at least one of the first UE 120 and the second UE 130 may be operated without user participation. That is, at least one of the first UE 120 and the second UE 130 is a device that performs machine type communication (MTC) and may not be carried by a user. Each of the first UE 120 and the second UE 130 may be referred to not only as a "user equipment (UE)", but also as a "terminal", "mobile station", "subscriber station", "remote terminal", "wireless terminal", "user equipment", or other terms having equivalent technical meanings.

[0046] The base station 110, the first UE 120, and the second UE 130 may transmit and receive wireless signals in a millimeter wave (mmWave) frequency band (e.g., 28 GHz, 30 GHz, 38 GHz, and 60 GHz). In this case, in order to improve the channel gain, the base station 110, the first UE 120, and the second UE 130 may perform beamforming. Beamforming may include transmit beamforming and receive beamforming. That is, the base station 110, the first UE 120, and the second UE 130 may assign directivity to a transmitted signal or a received signal. To this end, the base station 110 and the UEs 120 and 130 may select service beams 112, 113, 121, and 131 via a beam search process or a beam management process. After selecting the service beams 112, 113, 121, and 131, communication may be performed via resources having a quasi-co-location (QCL) relationship with the resources transmitting the service beams 112, 113, 121, and 131.

[0047] If the large-scale characteristics of the channel via which the symbol is transmitted on the first antenna port can be inferred from the channel via which the symbol is transmitted on the second antenna port, the first antenna port can be evaluated to be in a QCL relationship with the second antenna port. For example, the large-scale characteristics may include at least one of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial reception parameters.

[0048] Figure 2 The functional structure of a base station in a wireless communication system according to various embodiments of the present disclosure is shown. Figure 2 The illustrated structure may be understood as the structure of the base station 110. The terms "unit", "device", etc. used hereinafter may refer to a unit configured to process at least one function or operation and may be implemented as hardware, software, or a combination of hardware and software.

[0049] refer to Figure 2 The base station includes a wireless communication unit 210, a backhaul communication unit 220, a storage unit 230 and a controller 240.

[0050] The wireless communication unit 210 performs the functions of transmitting and receiving signals via a wireless channel. For example, the wireless communication unit 210 performs the conversion function between the baseband signal and the bit stream according to the physical layer specification of the system. For example, during data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating the transmission bit stream. In addition, during data reception, the wireless communication unit 210 recovers the received bit stream by demodulating and decoding the baseband signal.

[0051] In addition, the wireless communication unit 210 up-converts the baseband signal into a radio frequency (RF) band signal, transmits the up-converted RF band signal via an antenna, and then down-converts the RF band signal received via the antenna into a baseband signal. For this purpose, the wireless communication unit 210 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), etc. In addition, the wireless communication unit 210 may include multiple transmit / receive paths. In addition, the wireless communication unit 210 may include at least one antenna array, which includes a plurality of antenna elements.

[0052] In terms of hardware, the wireless communication unit 210 may include a digital unit and an analog unit, wherein the analog unit includes a plurality of subunits according to operating power, operating frequency, etc. The digital unit may be implemented as at least one processor (eg, a digital signal processor (DSP)).

[0053] The wireless communication unit 210 transmits and receives signals, as described above. Therefore, all or part of the wireless communication unit 210 may be referred to as a "transmitter," "receiver," or "transceiver." In addition, in the following description, transmission and reception performed via a wireless channel are used in a sense including performing processing by the wireless communication unit 210 as described above.

[0054] The backhaul communication unit 220 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 220 converts a bit stream transmitted from the base station to another node, such as another access node, another base station, a higher node or a core network, etc., into a physical signal, and converts a physical signal received from another node into a bit stream.

[0055] The storage unit 230 stores data such as basic programs, application programs, configuration information, etc. for the operation of the base station. The storage unit 230 may include a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data in response to a request of the controller 240.

[0056] The controller 240 controls the overall operation of the base station. For example, the controller 240 transmits and receives signals via the wireless communication unit 210 or the backhaul communication unit 220. In addition, the controller 240 records and reads data in the storage unit 230. The controller 240 may perform the functions of the protocol stack required by the communication standard. According to another implementation example, the protocol stack may be included in the wireless communication unit 210. To this end, the controller 240 may include at least one processor.

[0057] According to various embodiments, the controller 240 may control the base station to perform operations according to various embodiments described below.

[0058] Figure 3 A functional structure of a UE in a wireless communication system according to various embodiments of the present disclosure is shown. Figure 3 The illustrated structure may be understood as the structure of UE 120. The terms "unit", "device" and the like used hereinafter may refer to a unit configured to process at least one function or operation and may be implemented as hardware, software or a combination of hardware and software.

[0059] refer to Figure 3 , the UE may include a communication unit 310 , a storage unit 320 , and a controller 330 .

[0060] The communication unit 310 performs the function of transmitting and receiving signals via a wireless channel. For example, the communication unit 310 performs the conversion function between the baseband signal and the bit stream according to the physical layer specification of the system. For example, in the data transmission process, the communication unit 310 generates complex symbols by encoding and modulating the transmission bit stream. When receiving data, the communication unit 310 recovers the received bit stream by demodulating and decoding the baseband signal. The communication unit 310 up-converts the baseband signal into an RF band signal, transmits the up-converted RF band signal via an antenna, and then down-converts the RF band signal received via the antenna into a baseband signal. For example, the communication unit 310 may include a transmitting filter, a receiving filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, etc.

[0061] In addition, the communication unit 310 may include multiple transmit / receive paths. In addition, the communication unit 310 may include at least one antenna array including multiple antenna elements. In terms of hardware, the communication unit 310 may include digital circuits and analog circuits (e.g., radio frequency integrated circuits (RFIC)). The digital circuits and analog circuits may be implemented in a single package. In addition, the communication unit 310 may include multiple RF chains. In addition, the communication unit 310 may perform beamforming.

[0062] The communication unit 310 transmits and receives signals as described above. Therefore, all or part of the communication unit 310 may be referred to as a "transmitter," "receiver," or "transceiver." In addition, in the following description, transmission and reception performed via a wireless channel are used in a sense including performing processing by the communication unit 310 as described above.

[0063] The storage unit 320 stores data, such as basic programs, applications, configuration information, etc. for the operation of the UE. The storage unit 320 may include a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory. In addition, the storage unit 320 provides the stored data in response to a request from the controller 330.

[0064] The controller 330 controls the overall operation of the UE. For example, the controller 330 transmits and receives signals via the communication unit 310. In addition, the controller 330 records and reads data in the storage unit 320. The controller 330 can perform the functions of the protocol stack required by the communication standard. To this end, the controller 330 may include at least one processor or microprocessor, or may be a part of a processor. In addition, the communication unit 310 and a part of the controller 330 may be referred to as a communication processor (CP).

[0065] According to various embodiments, the controller 330 may control the UE to perform operations according to various embodiments described below.

[0066] Figure 4 The structure of a communication unit in a wireless communication system according to various embodiments of the present disclosure is shown. Figure 4 Show Figure 2 The wireless communication unit 210 or Figure 3 An example of the detailed structure of the communication unit 310 is shown in FIG. Figure 4 Shown as Figure 2 The wireless communication unit 210 or Figure 3 An element of a portion of the communication unit 310 for performing beamforming.

[0067] refer to Figure 4 , the wireless communication unit 210 or the communication unit 310 includes an encoder and modulator 402 , a digital beamformer 404 , a plurality of transmit paths 406 - 1 to 406 -N, and an analog beamformer 408 .

[0068] The encoder and modulator 402 performs channel coding. For channel coding, at least one of a low density parity check (LDPC) code, a convolutional code, and a polar code may be used. The encoder and modulator 402 generates modulation symbols by performing constellation mapping.

[0069] The digital beamformer 404 performs beamforming on a digital signal (e.g., a modulation symbol). To this end, the digital beamformer 404 multiplies the modulation symbol by a beamforming weight. Here, the beamforming weight is used to change the amplitude and phase of the signal and may be referred to as a "precoding matrix," "precoder," or the like. The digital beamformer 404 outputs the digitally beamformed modulation symbol to a plurality of transmission paths 406-1 to 406-N. According to a multiple-input multiple-output (MIMO) transmission technique, the modulation symbol may be multiplexed or the same modulation symbol may be provided to a plurality of transmission paths 406-1 to 406-N.

[0070] Multiple transmission paths 406-1 to 406-N convert the digital beamforming signal into an analog signal. To this end, each of the multiple transmission paths 406-1 to 406-N may include an inverse fast Fourier transform (IFFT) operator, a cyclic prefix (CP) inserter, a DAC, and an up-converter. The CP inserter is used for an orthogonal frequency division multiplexing (OFDM) scheme and can be excluded when another physical layer scheme (e.g., filter bank multi-carrier (FBMC)) is applied. That is, multiple transmission paths 406-1 to 406-N provide independent signal processing processes for multiple streams generated via digital beamforming. However, according to an implementation scheme, some elements of multiple transmission paths 406-1 to 406-N may be used together.

[0071] The analog beamformer 408 performs beamforming on the analog signal. To this end, the digital beamformer 404 multiplies the analog symbol by the beamforming weight. In this case, the beamforming weight is used to change the amplitude and phase of the signal. Specifically, according to the connection structure between the multiple transmission paths 406-1 to 406-N and the antenna, the analog beamformer 440 can be configured in various ways. For example, each of the multiple transmission paths 406-1 to 406-N can be connected to an antenna array. As another example, the multiple transmission paths 406-1 to 406-N can be connected to an antenna array. As another example, the multiple transmission paths 406-1 to 406-N can be adaptively connected to an antenna array, or can be connected to two or more antenna arrays.

[0072] Figure 5 An example of a full-duplex (FD) base station communication environment and cross-link interference (CLI) in a wireless communication system according to various embodiments of the present disclosure is shown.

[0073] Due to the increase in services requiring high-speed data transmission and the development of the Internet of Things (IoT), there is an increasing demand for improving the efficiency of spectrum resources in wireless networks. Therefore, various studies have been conducted to improve bandwidth, data transmission rate, etc. Among these studies, in-band FD communication systems have attracted attention as a next-generation technology to improve the efficiency of insufficient frequency resources.

[0074] In-band FD communication is a wireless communication technology that performs transmission and reception simultaneously in the same frequency band. Theoretically, twice the network throughput can be obtained in FD communication compared to half-duplex (HD) communication using the same frequency band, but since signal transmission and reception are performed simultaneously in the same frequency band, the transmitted signal may interfere with the signal to be received. Specifically, since transmission and reception between a base station and multiple UEs are performed simultaneously in FD communication, a signal transmitted by a UE may interfere with a signal received by another UE, and the interfering signal may be defined as cross-link interference (CLI).

[0075] According to various embodiments of the present disclosure, full-duplex (FD) communication described below may include not only in-band FD communication but also sub-band FD communication or cross-division duplex (XDD) FD communication, etc.

[0076] Subband FD communication can provide mixed subcarrier usage and asynchronous transmission to flexibly apply full-duplex communication. The subband full-duplex communication system can divide the entire system bandwidth into subbands, and then transmit uplink and downlink data for each subband at the same time. In this case, all transmission and reception processes including synchronization can be performed based on the divided subbands, so that subcarrier application and asynchronous uplink transmission can be performed differently for each subband. Such subband-specific transmission may cause interference between subbands, and various methods can be applied to prevent interference according to various embodiments of the present disclosure.

[0077] In order to improve the coverage of the base station and the UE, the XDD FD communication may include a scheme of dividing uplink and downlink resources in the frequency domain like a frequency division duplex (FDD) system under a time division duplex (TDD) system, rather than dividing the ratio only in the time domain according to the traffic ratio of the uplink and downlink. Since the XDD FD communication is a scenario where transmission and reception in the time domain and transmission and reception in the frequency domain coexist, interference may occur, and therefore, according to various embodiments of the present disclosure, various methods may be applied to prevent interference.

[0078] refer to Figure 5 In the wireless communication environment 501, in the FD base station environment, the base station 510 can perform unidirectional FD communication including the first UE 520 and the second UE 530. Each of the two UEs 520 and 530 of UL and DL communicating with the base station 510 can perform HD communication with the base station. In this case, in the FD base station environment, the uplink signal 521 transmitted by the first UE 520 and the downlink signal 531 received by the second UE 530 can be transmitted and received via the same frequency at the same time, so interference may occur.

[0079] refer to Figure 5 502, an example of time axis interference symbol, shows an example of time axis interference caused by signal interference between UEs in an FD base station environment. In an FD base station environment, uplink or downlink transmission and reception on the same time slot (or symbol) can be configured for a first UE 520 and a second UE 530 sharing the same frequency. In this case, since an uplink signal 521 transmitted by the first UE 520 and a downlink signal 531 received by the second UE 530 are transmitted and received at the same time, cross-link interference (CLI) may occur between the signals.

[0080] According to various embodiments of the present disclosure, the present disclosure describes a method and apparatus for minimizing interference that may occur during a process in which a base station of an FD system transmits and receives a data channel (e.g., a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH)) to and from at least one UE. Specifically, a technique is described in which a base station allocates resources for cross-link interference reference signal (CLI-RS) transmission and reception to at least one UE, and based on the resource allocation, receives a report on CLI-RS measurement and CLI-RS transmission and reception between at least one UE and performs data channel transmission and reception, thereby minimizing interference between at least one UE.

[0081] In the various embodiments described below, the interference occurring between the (downlink or uplink) signal transmission and reception of the corresponding UE in the FD system may be referred to as CLI. However, according to various embodiments of the present disclosure, the interference occurring between the signal transmission and reception of the corresponding UE in the FD system is not limited to CLI, and may be referred to as various terms such as UE-to-UE interference and full-duplex (FD) interference. In addition, in the various embodiments described below, CLI-RS may also be referred to as various terms interpreted as a reference signal for measuring interference between UEs, such as CLI measurement RS, crosslink channel state information RS, UE-to-UE channel information RS, or equivalent terms.

[0082] Figure 6 An example of measuring interference between multiple UEs and data channel scheduling based on the measurement in an FD system according to various embodiments of the present disclosure is shown. Specifically, refer to Figure 6 , showing an example of measuring UE-to-UE interference at the beam level for scheduling in an FD system.

[0083] Although Figure 6 Although not shown in the figure, the base station may allocate resources for (uplink or downlink) transmission and reception to at least one UE within the coverage of the base station. The resources allocated by the base station to at least one UE may be resources for at least one beam.

[0084] refer to Figure 6, at least one UE to which the base station has allocated resources for transmission and reception may perform cross-linked interference reference signal (CLI-RS) measurement 610. Specifically, before the CLI-RS measurement, the at least one UE may determine a beam for CLI-RS transmission and reception. The at least one UE may determine at least one beam from a plurality of available beams based on the allocated resources for CLI-RS transmission and reception. According to an embodiment, the at least one UE may determine a beam to be mapped or grouped to the allocated resources and perform beamforming. For example, one or more of the at least one UE may be a CLI-RS transmitting UE and determine a CLI-RS transmit beam (CLI-RS Tx beam), and another one or more UEs may be a CLI-RS receiving UE and determine a CLI-RS receive beam (CLI-RS Rx beam). As Figure 6 As shown, the CLI-RS transmitting UE can determine at least one CLI-RS transmitting beam (beam #0) 612 among multiple available beams (beam #0, beam #1, beam #2, and beam #3), and the CLI-RS receiving UE can determine at least one CLI-RS receiving beam (B-#0) 614 among multiple available beams (B-#0, B-#1, B-#2, and B-#3). The CLI-RS transmitting UE and the CLI-RS receiving UE can transmit and receive the CLI-RS based on the determined beams 612 and 614, respectively. In this case, the CLI-RS receiving UE may refer to a CLI-RS measuring UE, and may measure interference (e.g., CLI) based on the received CLI-RS. The CLI-RS receiving UE that has measured the interference may report information about the measurement to the base station. Reference Figure 6 , showing that there is one CLI-RS transmitting UE and one CLI-RS receiving UE, respectively, and there is one CLI-RS transmitting beam and one CLI-RS receiving beam determined by the UE, respectively, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the CLI-RS transmitting or receiving UE may include at least one UE, and the CLI-RS transmitting or receiving beam determined by each UE may include at least one beam.

[0085] refer to Figure 6, the base station may schedule 620 a data channel (e.g., PUSCH and PDSCH) for at least one UE based on the received CLI-RS measurement information. According to various embodiments of the present disclosure, in an FD system, a base station may schedule a data channel for at least one UE at the same frequency and at the same time. According to an embodiment, the base station may use a PUSCH transmit beam 622 determined for at least one CLI-RS transmitting UE for signal transmission and reception scheduling, and use a PDSCH receive beam 624 determined for at least one CLI-RS receiving UE for signal transmission and reception scheduling. According to an embodiment, in the FD system of the base station, concurrent signal scheduling for at least one UE may be referred to as PDSCH / PUSCH coordinated scheduling.

[0086] In addition, the base station may determine at least one beam of at least one UE or a pair of UEs based on the reported CLI-RS measurement to minimize interference. In addition, the base station may determine the determined UE or at least one beam as the UE or at least one beam for data channel transmission and reception. Figure 6 , the CLI-RS transmitting UE is shown as a UL UE for uplink signal (e.g., PUSCH) transmission, and the CLI-RS receiving UE is shown as a DL UE for downlink signal (e.g., PDSCH) transmission, and the PUSCH transmit beam 622 scheduled for the UL UE is shown to be the same as the determined CLI-RS transmit beam 612, and the PDSCH receive beam 624 scheduled for the DL UE is shown to be the same as the determined CLI-RS receive beam 614. Of course, according to various embodiments of the present disclosure, the present disclosure is not limited to the above example, and the PUSCH transmit beam 622 scheduled for signal transmission for the UL UE may be a beam having a different quasi-co-location (QCL) relationship with the determined CLI-RS transmit beam 612, and the PDSCH receive beam 624 scheduled for signal reception for the DL UE may be a beam having a different QCL relationship with the determined CLI-RS receive beam 614.

[0087] In addition, according to various embodiments of the present disclosure, the PUSCH transmit beam 622 may be a beam corresponding to the determined CLI-RS receive beam 614. The PDSCH receive beam 624 scheduled for the DL UE may be a beam having a different QCL relationship from the determined CLI-RS receive beam 614, and the PDSCH receive beam 624 may be a beam corresponding to the determined CLI-RS transmit beam 612. For example, the base station may schedule the CLI-RS transmit beam 612 as a beam for downlink signal reception of the CLI-RS transmitting UE, and may also schedule the CLI-RS receive beam 614 as a beam for uplink signal transmission of the CLI-RS receiving UE.

[0088] According to an embodiment, the coordinated scheduling of the base station can be performed based on the measurement information reported from the CLI-RS measurement UE (e.g., CLI-RS receiving UE), but is not limited thereto, and the CLI-RS measurement beam and the data channel beam do not necessarily match. In addition, according to an embodiment, the coordinated scheduling for data channel transmission and reception is described in the present disclosure, but is not limited thereto, and may include the transmission and reception of various signals for uplink or downlink.

[0089] Figure 7 The signal flow for measuring interference between a base station and a plurality of UEs and data scheduling based on the measurement in the FD system according to various embodiments of the present disclosure is shown. Specifically, refer to Figure 7 , showing a signal flow of data channel transmission and reception for minimizing interference between a base station (e.g., gNB) 710, a CLI-RS measurement UE 720, and a CLI-RS transmitting UE 730 in an FD system. According to an embodiment, the CLI-RS measurement UE 720 may be a CLI-RS receiving UE. According to various embodiments of the present disclosure, hereinafter, a reference signal for interference measurement may be referred to as a CLI-RS, but is not limited thereto. In addition, the reference signal for interference measurement may also be referred to as various terms interpreted as a reference signal for measuring interference between UEs, such as a CLI measurement RS, a crosslinked channel state information RS, a UE-to-UE channel information RS, or an equivalent term.

[0090] In step 705, the base station 710 may configure CLI measurement for the CLI-RS measurement UE 720 and the CLI-RS transmission UE 730. Specifically, the base station 710 may respectively allocate resources for reception or transmission to the CLI-RS measurement UE 720 and the CLI-RS transmission UE 730. According to an embodiment, the information about the resources allocated by the base station 710 may include information about a CLI-RS ID (or index) for each resource mapping or grouping.

[0091] According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped to one or more beams. In addition, according to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station 710. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station 710 to the CLI-RS measurement or transmission UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate a CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE. In step 705, it is shown that there is one UE for CLI-RS measurement and one UE for CLI-RS transmission. However, according to various embodiments of the present disclosure, the present disclosure is not limited thereto, and the base station may allocate resources for CLI-RS transmission or CLI-RS measurement to one or more CLI-RS transmitting UEs or one or more CLI-RS measurement UEs.

[0092] In step 715, the CLI-RS transmitting UE 730 may transmit the CLI-RS to the CLI-RS measuring UE 720 via the CLI-RS transmit beam determined based on the resources allocated for CLI-RS transmission. According to an embodiment, the CLI-RS transmit beam determined by the CLI-RS transmitting UE may include at least one beam, and the CLI-RS transmission may be performed according to the determined at least one CLI-RS transmit beam. That is, the CLI-RS transmitting UE may perform beam scanning during CLI-RS transmission. According to an embodiment, the beam scanning may include receiving-side beam coordination or transmitting-side beam coordination. According to an embodiment, the CLI-RS receiving UE may receive information about the CLI-RS transmit beam (e.g., a fixed beam) from the CLI-RS transmitting UE, and may identify at least one CLI-RS receiving beam based on the received information. The CLI-RS receiving UE may transmit information about the identified CLI-RS receiving beam to the CLI-RS transmitting UE. The CLI-RS receiving UE may receive the CLI-RS based on the information about the CLI-RS transmit beam and the identified CLI-RS receive beam. According to an embodiment, the CLI-RS transmitting UE may receive information about the CLI-RS receive beam (e.g., a fixed beam) from the CLI-RS receiving UE, and may identify at least one CLI-RS transmit beam based on the received information. The CLI-RS transmitting UE may transmit information about the identified CLI-RS transmit beam to the CLI-RS receiving UE. The CLI-RS transmitting UE may transmit the CLI-RS based on the information about the CLI-RS receive beam and the identified CLI-RS transmit beam. For example, during receive-side beam coordination (or scanning), the transmit beam may be fixed, and the receiving UE may perform measurements by sequentially applying the receive beams. Conversely, during transmit-side beam coordination, the receive beam may be fixed, and measurements may be performed by sequentially applying the transmit beams. In the above description, the transmitting side UE and the receiving side UE may provide each other with beam information (eg, a fixed beam or a sequentially applied beam) for beam scanning in order to perform beam scanning.

[0093] The CLI-RS measurement UE 720 may receive the CLI-RS from the CLI-RS transmitting UE 730 via a CLI-RS receiving beam determined based on resources allocated for CLI-RS reception. According to an embodiment, the CLI-RS receiving beam determined by the CLI-RS receiving UE may include at least one beam, and the CLI-RS reception may be performed according to the determined at least one CLI-RS receiving beam. That is, the CLI-RS receiving UE may perform beam scanning during CLI-RS reception. The aforementioned beam scanning may include receiving side beam fixing or transmitting side beam fixing. To this end, the CLI-RS receiving UE may transmit and receive beam information (e.g., a fixed beam or a beam applied sequentially) for beam scanning with the CLI-RS measurement UE. According to an embodiment, the CLI-RS receiving UE may receive information about a CLI-RS transmitting beam (e.g., a fixed beam) from the CLI-RS transmitting UE, and may identify at least one CLI-RS receiving beam based on the received information. The CLI-RS receiving UE may transmit information about the identified CLI-RS receiving beam to the CLI-RS transmitting UE. The CLI-RS receiving UE may receive the CLI-RS based on the information about the CLI-RS transmit beam and the identified CLI-RS receive beam. According to an embodiment, the CLI-RS transmitting UE may receive information about the CLI-RS receive beam (e.g., a fixed beam) from the CLI-RS receiving UE, and may identify at least one CLI-RS transmit beam based on the received information. The CLI-RS transmitting UE may transmit information about the identified CLI-RS transmit beam to the CLI-RS receiving UE. The CLI-RS transmitting UE may transmit the CLI-RS based on the information about the CLI-RS receive beam and the identified CLI-RS transmit beam. For example, for transmit side fixed, the CLI-RS transmitting UE may transmit information about the fixed beam to the CLI-RS receiving UE, and the CLI-RS receiving UE may transmit information about the CLI-RS receive beam of the sequential change and application to the CLI-RS transmitting UE. In addition, the CLI-RS measuring UE 720 may perform CLI measurement based on the CLI-RS received from the CLI-RS transmitting UE 730.

[0094] In step 725, the CLI-RS measurement UE 720 may report the measured CLI information to the base station 710. According to an embodiment, the CLI-RS measurement UE 720 may report the CLI-RS measurement information to the base station 710 by using a CLI-RS reporting resource allocated from the base station 710. According to various embodiments of the present disclosure, the CLI-RS measurement UE 720 may report the CLI-RS measurement information to the base station 710 by various methods. Hereinafter, a reporting method that the CLI-RS measurement UE 720 may determine is described.

[0095] Method 1) Full CLI Report: CLI-RS Measurement The UE 720 may report to the base station 710 all information about at least one beam pair used for CLI-RS transmission and reception.

[0096] Method 2) Minimum CLI reporting: The CLI-RS measurement UE 720 may report to the base station 710 a CLI-RS index indicating at least one beam pair having the smallest interference value among the measured CLI values. The index of at least one beam pair having the smallest interference value reported by the CLI-RS measurement UE 720 may be an index of at least one beam pair based on a CLI-RS received from at least one CLI-RS transmitting UE. According to an embodiment, the information reported by the CLI-RS measurement UE 720 may be an index of at least one beam pair including a beam pair having the Nth lowest interference value and an index for the beam pair having the lowest interference value. According to an embodiment, the N value may be pre-configured by the base station.

[0097] Method 3) CLI average value reporting: The CLI-RS measurement UE 720 may calculate an average value of interference values ​​of all at least one beam pair used for CLI-RS transmission and reception, and report information about the average value to the base station 710 .

[0098] Method 4) CLI report by threshold comparison: The CLI-RS measurement UE 720 may report the interference value of at least one beam pair for CLI-RS transmission and reception to the base station 710 based on the threshold. Specifically, according to an embodiment, the CLI-RS measurement UE 720 may report information about one or more beam pairs whose interference values ​​are equal to or less than the threshold and their index information to the base station 710. According to an embodiment, the threshold may be pre-configured by the base station 710 or may be pre-defined in the UE itself.

[0099] Method 5) Blacklist report: The CLI-RS measurement UE 720 may determine the index of a portion of at least one beam pair used for CLI-RS transmission and reception as a blacklist, and report the blacklist. Specifically, the CLI-RS measurement UE 720 may determine the blacklist as one or more beam pairs with higher interference values, and report the blacklist to the base station 710, and the base station 710 may schedule the transmission and reception of data channels other than the one or more beam pairs included in the blacklist. According to an embodiment, the CLI-RS measurement UE 720 may determine the blacklist as one or more beam pairs with interference values ​​equal to or greater than the reference interference value based on a specific reference interference value, and the reference interference value may be configured by the base station or may be predefined in the UE itself. However, the method for determining the blacklist according to various embodiments of the present disclosure is not limited thereto, and may include various methods, such as determining the blacklist as one or more beam pairs for which a specific event has occurred.

[0100] As described above, the CLI-RS measurement UE 720 may determine at least one of methods 1) to 5) based on various reasons such as feedback overhead, and may report CLI-RS measurement information to the base station 710 via the determined method. However, according to various embodiments of the present disclosure, the CLI-RS measurement information is not limited to being reported according to a separate method, and the CLI-RS measurement UE 720 may report the CLI-RS measurement information to the base station 710 via at least one of methods 1) to 5) or a combination thereof.

[0101] In step 735, the base station 710 may schedule the UE for DL ​​reception or the UE for UL transmission based on the CLI-RS measurement information. According to an embodiment, the base station 710 may determine a corresponding beam for CLI-RS transmission and reception based on a channel quality indicator (CQI) reported from at least one UE in addition to the CLI-RS measurement information reported from the CLI-RS measurement UE 720. The base station 710 may provide coordinated scheduling information to the DL UE and the UL UE based on the determined beam.

[0102] Specifically, the base station 710 may instruct the UE to use the beam used during the CLI-RS measurement for DL ​​or UL. For example, the base station 710 may determine the best beam pair based on the reported CLI-RS measurement information, and may configure or schedule the beam direction so that the UE may transmit and receive a data channel, etc., via the determined best beam pair.

[0103] The base station 710 may use the CLI-RS index to indicate the transmit and receive beams used during DL / UL signal transmission and reception. According to an embodiment, the base station 710 may schedule UL transmission (e.g., PUSCH) for the CLI-RS transmitting UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS transmitting beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS transmitting UE 730 for CSI-RS transmission in step 715. Alternatively, the base station 710 may schedule DL transmission (e.g., PDSCH) for the CLI-RS measuring UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS receiving beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS measuring UE 730 for CSI-RS reception.

[0104] According to an embodiment, the base station 710 may estimate the CLI from UE to UE based on the reported CLI-RS measurement information, and may perform FD coordinated scheduling between UEs with low CLI values. According to an embodiment, the base station 710 may estimate the CLI between beam pairs of UEs based on the reported CLI-RS measurement information, and may perform FD coordinated scheduling for beam pairs with low CLI values. For example, according to an embodiment, the base station 710 may determine a UE pair with a minimum CLI-RS based on the reported CLI-RS measurement information. The base station 710 may determine a pair of a CLI-RS measuring UE 720 and a CLI-RS transmitting UE with a minimum interference value based on the CLI value between at least one CLI-RS measuring UE 720 and at least one CLI-RS transmitting UE 730. To determine this, the base station 710 may use CLI-RS measurements between a CLI-RS measuring UE 720 and multiple CLI-RS transmitting UEs 730, respectively. Alternatively, but not limited thereto, the base station 710 may perform CLI-RS measurement between one CLI-RS transmitting UE 730 and a plurality of CLI-RS measuring UEs 720, respectively.

[0105] However, the above examples are only examples, and the present disclosure is not limited thereto. For example, there may be a situation where channel reciprocity is satisfied, for example, there may be a situation where the condition is satisfied, wherein even if the downlink transmit / receive beam pair of the base station and the UE is used as an uplink transmit / receive beam pair, the channel quality is generally not significantly affected. According to an embodiment, in various situations including a situation where channel reciprocity is satisfied, the base station 710 may schedule UL transmission (e.g., PUSCH) for the CLI-RS measurement UE 720, and schedule DL reception (e.g., PDSCH) for the CLI-RS transmission UE 730, differently from the above scheduling, by indicating an index for the CLI-RS receive beam.

[0106] According to an embodiment, for data transmission and reception via a single link between the base station 710 and each UE, beam indication signaling for indicating the best beam pair may be performed separately. For example, the base station and the UE may use a reference signal to determine an appropriate transmit / receive beam pair via beam management, beam scanning, etc. Referring to the 5G NR standard specification, the base station may transmit a transmission configuration indication (TCI) state including a beam indication via downlink control information (DCI) to notify the UE that the downlink signal is being transmitted on the same beam as the configured RS. Therefore, according to various embodiments of the present disclosure, the beam indication signaling used for the above-mentioned single-link communication may need to be distinguished from the CLI-RS-based beam indication signaling.

[0107] According to various embodiments of the present disclosure, as in an FD base station environment, in an asymmetric full-duplex system in which DL or UL is cooperatively scheduled for at least one UE, additional L1 signaling or radio resource control (RRC) signaling may be used separately from the existing beam indication signaling in order to perform beam indication scheduling that minimizes interference between links of the corresponding UE. According to an embodiment, the base station 710 may configure a beam for a data channel by using an additional separate bit of the DCI to schedule data channel transmission and reception of each UE by using a CLI-RS index. According to an embodiment, during scheduling of data channel transmission and reception of each UE without using an additional separate bit, the base station 710 may configure a beam for a data channel by a method of separately configuring a bandwidth part (BWP).

[0108] In step 745, the CLI-RS measurement UE 720 that has been scheduled for PDSCH by the base station 710 can determine the beam configured for a specific time point (on which the UE should operate) according to the CLI-RS ID based on the received beam index (e.g., CLI-RS resource number) for CLI-RS reception, and can determine the determined beam as the reception beam for data channel reception. The CLI-RS transmission UE 730 that has been scheduled for PUSCH by the base station 710 can determine the beam configured for a specific time point (on which the UE should operate) according to the CLI-RS ID based on the received beam index (e.g., CLI-RS resource number) for CLI-RS transmission, and can determine the determined beam as the transmission beam for data channel transmission.

[0109] However, according to various embodiments of the present disclosure, but not limited thereto, when channel reciprocity may be considered as described above, the CLI-RS measurement UE 720 may receive a beam index for CLI-RS reception together with PUSCH scheduling, thereby determining a beam for uplink transmission, or the CLI-RS transmission UE 730 may receive a beam index for CLI-RS transmission together with PDSCH scheduling, thereby determining a beam for downlink reception. Although Figure 7 Not shown, but according to an embodiment, each UE can not only receive a CLI-RS beam index, but also receive a beam indication indicating a beam pair via a single link, and the base station can individually configure one of multiple beam indications, which will be used to determine the data channel transmit / receive beam.

[0110] In step 755, each UE may transmit or receive a data channel signal by using a configured transmit beam or receive beam. According to an embodiment, the CLI-RS measurement UE 720 may receive a PDSCH transmitted from a base station in a configured receive beam direction, or the CLI-RS transmission UE 730 may transmit a PUSCH to a base station in a configured transmit beam direction. However, not limited thereto, according to an embodiment, when channel reciprocity is considered, the CLI-RS measurement UE 720 may transmit a PUSCH to a base station in a configured receive beam direction, and the CLI-RS transmission UE 730 may receive a PDSCH transmitted from a base station in a configured transmit beam direction. According to various embodiments of the present disclosure, a signal transmitted and received by each UE will be referred to as FD PUSCH or FD PDSCH, but is not limited thereto, and the signal may include various signals (sounding reference signal (SRS), physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), and demodulation reference signal (DMRS)) in addition to a data channel.

[0111] Figures 8a to 8eVarious examples of resource allocation for transmission and reception of a base station according to various embodiments of the present disclosure are shown. Figures 8a to 8e , shows an embodiment in which a base station configures resource allocation for CLI-RS measurement UE and CLI-RS transmission UE. In the following, Figures 8a to 8e The process described in can be Figure 7 Specific details of one of the steps described in (step 705), and by Figures 8a to 8e The described processes can be referred to as independent processes, or at least one of the processes can be referred to as Figure 7 All steps are mentioned in one step. In addition, through Figures 8a to 8e The described embodiments of resource allocation may be used in combination with each other.

[0112] The base station may allocate resources for reception or transmission to the CLI-RS measurement UE and the CLI-RS transmission UE, respectively. According to an embodiment, the resource information allocated by the base station may include information about the CLI-RS identifier (ID) mapped or grouped for each resource. According to an embodiment, the resources allocated by the base station to each UE may be mapped or grouped to one or more beams. According to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station to the CLI-RS measurement or transmission UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate the CLI-RS resource identifier (i.e., CLI-RS ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE.

[0113] refer to Figures 8a to 8e , showing various embodiments of configuration of resources allocated by a base station to at least one UE and beams mapped or grouped to the resources. According to an embodiment, the resources allocated by the base station may include resources for CLI-RS transmission of a CLI-RS transmitting UE and resources for CLI-RS reception of a CLI-RS receiving UE. Figures 8a to 8e , but not limited to this, according to various embodiments of the present disclosure, the CLI-RS ID may be mapped or grouped in the corresponding resources allocated by the base station, but not all resources allocated by the base station may have mapped or grouped beams for CLI-RS transmission and reception.

[0114] refer to Figure 8aAccording to an embodiment, the base station may allocate three consecutive symbols in one time slot as resources for CLI-RS. According to an embodiment, resource allocation between the base station and each UE may be performed in a half-duplex (HD) system. For example, the base station may map or group CLI-RSIDs for symbols #7, #8, and #9 of time slot #2 in a time slot under the time slot level 811, and allocate CLI-RS IDs as resources for CLI-RS transmission and reception. In addition, in symbols #7, #8, and #9 of time slot #2, CLI-RS transmit and receive beam pairs may be mapped or grouped, respectively. That is, different beams may be mapped or grouped 813 to three consecutive resource regions starting from symbol #7. Beam #0 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 815 in symbol #7. Beam #0 in the CLI-RS transmit beam and B-#0 in the CLI-RS receive beam may be mapped or grouped 817 in symbol #8. Beam #1 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 819 in symbol #9.

[0115] refer to Figure 8b , according to an embodiment, the base station may allocate symbols at the same position in consecutive time slots as resources for CLI-RS. According to an embodiment, resource allocation between the base station and each UE may be performed in a half-duplex (HD) system. For example, the base station may map or group CLI-RSIDs for symbol #7 of time slots #2, #3, and #4 in the time slot under the time slot level 821, and allocate CLI-RS IDs as resources for CLI-RS transmission and reception. In addition, CLI-RS transmit and receive beam pairs may be mapped or grouped 823 in the symbol #7 resource region of time slots #2, #3, and #4, respectively. Beam #0 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 825 in symbol #7 of time slot #2. Beam #0 in the CLI-RS transmit beam and B-#0 in the CLI-RS receive beam may be mapped or grouped 827 in symbol #7 of time slot #3. Beam #1 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 829 in symbol #7 of slot #4.

[0116] refer to Figure 8cAccording to an embodiment, the base station may allocate three symbols with a constant interval within a time slot as resources for CLI-RS. According to an embodiment, resource allocation between the base station and each UE may be performed in a half-duplex (HD) system. For example, the base station may map or group CLI-RS IDs for symbols #7, #9, and #11 of time slot #2 in a time slot under the time slot level 831, and allocate CLI-RS IDs as resources for CLI-RS transmission and reception. In addition, in symbols #7, #9, and #11 of time slot #2, CLI-RS transmit and receive beam pairs may be mapped or grouped, respectively. That is, different beams may be mapped or grouped 833 to three resource regions with an interval of 1 symbol starting from symbol #7. Beam #0 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 835 in symbol #7. Beam #0 in the CLI-RS transmit beam and B-#0 in the CLI-RS receive beam may be mapped or grouped 837 in symbol #9. Beam #1 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 839 in symbol #11.

[0117] refer to Figure 8d According to an embodiment, the base station may allocate symbols at the same position within a time slot with a constant interval as resources for CLI-RS. According to an embodiment, resource allocation between the base station and each UE may be performed in a half-duplex (HD) system. For example, the base station may map or group CLI-RS IDs for symbol #7 of time slots #2, #4, and #6 in a time slot under the time slot level 841, and allocate CLI-RS IDs as resources for CLI-RS transmission and reception. In addition, CLI-RS transmit and receive beam pairs may be mapped or grouped 843 in the symbol #7 resource region of time slots #2, #4, and #6, respectively. Beam #0 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 845 in symbol #7 of time slot #2. Beam #0 in the CLI-RS transmit beam and B-#0 in the CLI-RS receive beam may be mapped or grouped 847 in symbol #7 of time slot #4. Beam #1 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 849 in symbol #7 of slot #6.

[0118] refer to Figure 8eAccording to an embodiment, the base station may allocate any symbol in any time slot as a resource for CLI-RS. According to an embodiment, resource allocation between the base station and each UE may be performed in a half-duplex (HD) system. For example, the base station may map or group CLI-RS IDs for symbol #7 of time slot #1, symbol #11 of time slot #4, and symbol #4 of time slot #9 in the time slot under the time slot level 851, and allocate the CLI-RS IDs as resources for CLI-RS transmission and reception. In addition, the CLI-RS transmit and receive beam pairs may be mapped or grouped 853 in the resource regions of symbol #7 of time slot #1, symbol #11 of time slot #4, and symbol #4 of time slot #9, respectively. Beam #0 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 855 in symbol #7 of time slot #1. Beam #0 in the CLI-RS transmit beam and B-#0 in the CLI-RS receive beam may be mapped or grouped 857 in symbol #11 of slot #4. Beam #1 in the CLI-RS transmit beam and B-#1 in the CLI-RS receive beam may be mapped or grouped 859 in symbol #4 of slot #9.

[0119] According to various embodiments of the present disclosure, each UE may determine the allocated resources and the beam corresponding thereto, and perform CLI-RS transmission and reception operations based on the determined beam. A base station that has received a CLI-RS measurement report by CLI-RS transmission and reception may determine at least one optimal beam, and schedule a data channel for each UE based on the at least one optimal beam. The scheduling performed by the base station may include a CLI-RS ID corresponding to at least one optimal beam. Each UE scheduled for data channel transmission and reception may select a data channel transmission / reception beam based on the received CLI-RS ID. According to an embodiment, Figures 8a to 8e The case where each resource region explicitly indicates one beam is shown. However, the present disclosure is not limited thereto, and the resource region allocated to each UE by the base station may include only the CLI-RS ID and may not explicitly indicate the beam. If a beam is not explicitly indicated in each resource region, the UE may determine the beam corresponding to the allocated resource and the CLI-RS ID contained in the resource via self-determination or various methods even without explicit indication from the base station. According to an embodiment, Figures 8a to 8eThe case where the base station allocates multiple resource regions to each UE is shown. However, the present disclosure is not limited to this, and the base station can allocate a single resource region to each UE. If at least one beam identified based on the allocated resources is a single beam, each UE can perform CLI-RS transmission and reception and CLI-RS measurement via a single beam, and the base station that has received the CLI-RS measurement report from the CLI-RS measurement UE can determine the CLI-RS transmitting UE with the best interference value for the CLI-RS measurement UE, and perform coordinated scheduling of FD data channel signals for these UEs.

[0120] Fig. 9 The UE operation flow of receiving allocation of resources for transmission and reception from a base station in order to measure and report interference in an FD system according to various embodiments of the present disclosure is shown. Fig. 9 The process described in can be Figure 7 Specific details of one of the steps described in (step 705), and by Fig. 9 The described processes can be referred to as independent processes, or at least one of the processes can be referred to as Figure 7 In addition, the UE mentioned below may include a CLI-RS transmitting UE that determines a CLI-RS transmitting beam to transmit a CLI-RS and a CLI-RS receiving UE that determines a CLI-RS receiving beam to receive a CLI-RS.

[0121] In step 905, the UE may receive an allocation of at least one resource for CLI-RS transmission and reception from the base station. Specifically, if the UE is a CLI-RS transmitting UE, the UE may receive an allocation of resources for signal transmission from the base station, or if the UE is a CLI-RS receiving UE, the UE may receive an allocation of resources for signal reception from the base station. According to an embodiment, the resource information allocated by the base station may include information about a CLI-RS ID mapped or grouped for each resource. According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped to one or more beams. According to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station to the CLI-RS measurement or transmission UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate a CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE.

[0122] In step 915, the UE may identify at least one CLI-RS transmit / receive beam among multiple available beams based on the resources allocated from the base station. Specifically, the CLI-RS transmitting UE may identify at least one CLI-RS transmit beam among multiple available beams based on the resources for CLI-RS transmission allocated from the base station. The CLI-RS receiving UE may identify at least one CLI-RS receive beam among multiple available beams based on the resources for CLI-RS reception allocated from the base station. According to an embodiment, the base station may allocate at least one resource for CLI-RS transmission and reception to the UE, and the UE may identify the number of CLI-RS transmit / receive beams among multiple available beams in the resources allocated for transmission and reception.

[0123] If multiple CLI-RS transmit / receive beams are identified by the UE, the UE may proceed to step 925 to perform CLI-RS transmission and reception, measurement, and reporting based on the multiple CLI-RS beams. Figures 13 to 16 Specifically, the UE may perform CLI-RS transmission and reception via resources allocated for CLI-RS transmission and reception and multiple beams determined based on the resources. CLI-RS measurement The UE may perform CLI-RS measurement on the corresponding beam performing CLI-RS transmission and reception, and via Figure 7 At least one of the various reporting methods disclosed in the report is reported to the base station. According to an embodiment, performing CLI-RS measurement on multiple beam pairs may include at least one of performing beam scanning according to CLI-RS transmit beam fixation or performing beam scanning according to CLI-RS receive beam fixation. According to an embodiment, the base station that has received the measurement report may determine the optimal beam pair, and transmit scheduling information including the index of the optimal beam pair and the CLI-RS ID to the UE. According to an embodiment, the base station that has received the measurement report may determine the UE pair for scheduling based on the CLI value of the CLI-RS transmitting UE having the lowest interference value for the CLI-RS measurement UE.

[0124] If a single CLI-RS transmit / receive beam is identified by the UE, the UE may proceed to step 935 to perform CLI-RS transmission and reception, measurement, and reporting based on the single CLI-RS beam. The UE performs operations based on a single CLI-RS beam. Figures 10 to 12 Specifically, the UE may perform CLI-RS transmission or reception via the allocated resources for CLI-RS transmission and reception and a single beam determined based on the resources. CLI-RS measurement The UE may perform CLI-RS measurement on the beam used to receive the CLI-RS transmitted from one or more CLI-RS transmitting UEs, and may perform CLI-RS measurement via Figure 7 According to an embodiment, the base station that has received the measurement report may determine a CLI-RS transmitting UE and a CLI-RS measuring UE that include an optimal beam pair, and transmit scheduling information including an index for the optimal beam pair and a CLI-RS ID to the CLI-RS measuring UE or the determined CLI-RS transmitting UE.

[0125] In the following, Figures 10 to 12 Operations associated with CLI-RS measurements and reporting over a single CLI-RS beam transmission and reception are shown. Figures 10 to 12 The series of processes described in can be Figure 7 The specific details of the series of processes (steps 705 to 725) in the steps described in Figures 10 to 12 The described processes can be referred to as independent processes, or at least one of the processes can be referred to as Figure 7 One step among all the steps is mentioned.

[0126] Fig.10 The signal flow for single beam based interference measurement and reporting according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.10 , shows a signal flow for CLI-RS measurement and reporting between a base station 1010 and at least one UE (including a CLI-RS measuring UE 1020 and at least one CLI-RS transmitting UE 1030 and 1040).

[0127] In step 1005, the base station 1010 may configure CLI measurement for the CLI-RS measurement UE 1020 and the first CLI-RS transmission UE 1030. Specifically, the base station 1010 may respectively allocate resources for CLI-RS reception or transmission to the CLI-RS measurement UE 1020 and the first CLI-RS transmission UE 1030. According to an embodiment, the information about the resources allocated by the base station 1010 may include information about a CLI-RS ID (or index) for each resource mapping or grouping.

[0128] According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped into one beam. In addition, according to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station 1010. That is, a single beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station 1010 to the CLI-RS measurement UE 1020 or the first CLI-RS transmitting UE 1030. According to an embodiment, beam information may not be specified in the resources allocated to each UE by the base station 1010. That is, the base station may only indicate the CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE. For example, if a beam is not explicitly indicated in each resource region, each UE may determine the beam corresponding to the allocated resources and the CLI-RS ID contained in the resources via self-determination or various methods even without an explicit indication of the base station.

[0129] In step 1015, the base station 1010 may configure CLI measurement for the CLI-RS measurement UE 1020 and the second CLI-RS transmission UE 1040. Specifically, the base station 1010 may allocate resources for reception or transmission to the CLI-RS measurement UE 1020 and the second CLI-RS transmission UE 1040, respectively. According to an embodiment, the information of the CLI-RS beam allocated to each UE by the base station in step 1015 or the information of the resources may be different from the information of the CLI-RS beam allocated to each UE by the base station in step 1005 or the information of the resources. According to an embodiment, the information about the resources allocated by the base station 1010 may include information about a CLI-RS ID (or index) for each resource mapping or grouping.

[0130] According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped into one beam. According to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station 1010. That is, a single beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station 1010 to the CLI-RS measurement UE 1020 or the second CLI-RS transmission UE 1040. According to an embodiment, beam information may not be specified in the resources allocated to each UE by the base station 1010. That is, the base station may only indicate the CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE. For example, if a beam is not explicitly indicated in each resource region, each UE may determine the beam corresponding to the allocated resources and the CLI-RS ID contained in the resources via self-determination or various methods even without an explicit indication of the base station.

[0131] In step 1025, the first CLI-RS transmitting UE 1030 may transmit a CLI-RS to the CLI-RS measuring UE 1020 via a CLI-RS transmit beam determined based on resources allocated for CLI-RS transmission. According to an embodiment, the CLI-RS transmit beam determined by the first CLI-RS transmitting UE 1030 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may include a single beam. According to an embodiment, the CLI-RS transmit beam determined by the first CLI-RS transmitting UE 1030 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may each include a beam indicated by the base station 1010. According to an embodiment, the CLI-RS transmit beam determined by the first CLI-RS transmitting UE 1030 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may each include a beam determined by UE self-determination (e.g., best effort) or the like. The first CLI-RS measurement UE 1030 may transmit a CLI-RS to the CLI-RS measurement UE 1020 via a CLI-RS transmission beam determined based on resources allocated for CLI-RS transmission. The CLI-RS measurement UE 1020 may receive a CLI-RS from the first CLI-RS transmission UE 1030 via a CLI-RS reception beam determined based on resources allocated for CLI-RS reception. According to an embodiment, the CLI-RS measurement UE 1020 may perform CLI measurement based on the CLI-RS received from the first CLI-RS transmission UE 1030 and the second CLI-RS transmission UE 1040.

[0132] In step 1035, the second CLI-RS transmitting UE 1040 may transmit the CLI-RS to the CLI-RS measuring UE 1020 via the CLI-RS transmit beam determined based on the resources allocated for CLI-RS transmission. According to an embodiment, the CLI-RS transmit beam determined by the second CLI-RS transmitting UE 1040 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may include a single beam. According to an embodiment, the CLI-RS transmit beam determined by the second CLI-RS transmitting UE 1040 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may each include a beam indicated by the base station 1010. According to an embodiment, the CLI-RS transmit beam determined by the second CLI-RS transmitting UE 1040 or the CLI-RS receive beam determined by the CLI-RS measuring UE 1020 may each include a beam determined by UE self-determination (e.g., best effort) or the like. The second CLI-RS measurement UE 1040 may transmit a CLI-RS to the CLI-RS measurement UE 1020 via a CLI-RS transmission beam determined based on resources allocated for CLI-RS transmission. The CLI-RS measurement UE 1020 may receive a CLI-RS from the second CLI-RS measurement UE 1040 via a CLI-RS reception beam determined based on resources allocated for CLI-RS reception. According to an embodiment, the CLI-RS measurement UE 1020 may perform CLI measurement based on the CLI-RS received from the first CLI-RS transmission UE 1030 and the second CLI-RS transmission UE 1040.

[0133] In step 1045, the CLI-RS measurement UE 1020 may report the measured CLI information to the base station 1010. According to various embodiments of the present disclosure, the CLI-RS measurement UE 1020 may report the CLI-RS measurement information to the base station 1010 through various methods. According to an embodiment, the CLI-RS measurement UE 1020 may report the CLI-RS measurement information to the base station 1010 by using a CLI-RS reporting resource allocated from the base station 1010. Hereinafter, a reporting method that the CLI-RS measurement UE 1020 may determine is described.

[0134] Method 1) Full CLI Report: CLI-RS Measurement The UE 1020 may report to the base station 1010 all information about at least one beam pair used for CLI-RS transmission and reception.

[0135] Method 2) Minimum CLI reporting: The CLI-RS measurement UE 1020 may report to the base station 1010 a CLI-RS index indicating at least one beam pair having the smallest interference value among the measured CLI values. The index of at least one beam pair having the smallest interference value reported by the CLI-RS measurement UE 1020 may be an index of at least one beam pair based on a CLI-RS received from at least one CLI-RS transmitting UE. According to an embodiment, the information reported by the CLI-RS measurement UE 1020 may be an index of at least one beam pair including a beam pair having the Nth lowest interference value and an index for the beam pair having the lowest interference value. According to an embodiment, the N value may be pre-configured by the base station.

[0136] Method 3) CLI average value reporting: CLI-RS measurement The UE 1020 may calculate an average value of interference values ​​of all at least one beam pair used for CLI-RS transmission and reception, and report information about the average value to the base station 1010 .

[0137] Method 4) CLI report by threshold comparison: The CLI-RS measurement UE 1020 may report the interference value of at least one beam pair used for CLI-RS transmission and reception to the base station 1010 based on the threshold. Specifically, according to an embodiment, the CLI-RS measurement UE 1020 may report information about one or more beam pairs whose interference values ​​are equal to or less than the threshold and their index information to the base station 1010. According to an embodiment, the threshold may be pre-configured by the base station 1010 or may be pre-defined in the UE itself.

[0138] Method 5) Blacklist report: The CLI-RS measurement UE 1020 may determine the index of a portion of at least one beam pair used for CLI-RS transmission and reception as a blacklist, and report the blacklist. Specifically, the CLI-RS measurement UE 1020 may determine the blacklist as one or more beam pairs with higher interference values, and report the blacklist to the base station 1010, and the base station 1010 may schedule the transmission and reception of data channels other than the one or more beam pairs included in the blacklist. According to an embodiment, the CLI-RS measurement UE 1020 may determine the blacklist as one or more beam pairs with interference values ​​equal to or greater than the reference interference value based on a specific reference interference value, and the reference interference value may be configured by the base station or may be predefined in the UE itself. However, the method for determining the blacklist according to various embodiments of the present disclosure is not limited thereto, and may include various methods, such as determining the blacklist as one or more beam pairs for which a specific event has occurred.

[0139] As described above, the CLI-RS measurement UE 1020 may determine at least one of methods 1) to 5) based on various reasons such as feedback overhead, and may report CLI-RS measurement information to the base station 1010 via the determined method. However, according to various embodiments of the present disclosure, the CLI-RS measurement information is not limited to being reported according to a separate method, and the CLI-RS measurement UE 1020 may report the CLI-RS measurement information to the base station 1010 via at least one of methods 1) to 5) or a combination thereof.

[0140] although Fig.10 As not shown in the figure, the base station 1010 may determine the UE pair with the smallest CLI-RS based on the reported CLI-RS measurement information. The base station 1010 may determine the pair of one CLI-RS measuring UE 1020 and one CLI-RS transmitting UE 1030 or 1040 with the smallest interference value based on the CLI value between the CLI-RS measuring UE 1020 and at least one CLI-RS transmitting UE 1030 and 1040. To determine this, the base station 1010 may use CLI-RS measurements between one CLI-RS measuring UE 1020 and multiple CLI-RS transmitting UEs 1030 and 1040, respectively. Alternatively, but not limited to this, the base station 1010 may use CLI-RS measurements between one CLI-RS transmitting UE and multiple CLI-RS measuring UEs, respectively.

[0141] Fig.11a and Fig.11b An example of single beam determination for interference measurement according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.11a and Fig.11b , showing an example in which a CLI-RS measurement UE and a CLI-RS transmission UE respectively determine a CLI-RS reception beam and a CLI-RS transmission beam as a single beam based on resource allocation from a base station.

[0142] According to various embodiments of the present disclosure, the base station may allocate resources for reception and transmission to the CLI-RS measurement UE and the CLI-RS transmission UE, respectively. According to an embodiment, the information about the resources allocated by the base station may include information about the CLI-RS ID (or index) mapped or grouped for each resource. According to an embodiment, the resources allocated by the base station to each UE may be mapped or grouped to one beam.

[0143] According to an embodiment of the present disclosure, the resources allocated to each UE by the base station may be mapped (or grouped) to one beam. According to an embodiment, one resource allocated to each UE by the base station may include information about a CLI-RS beam mapped to one resource (e.g., resource ID and resource position). The CLI-RS beam mapped to one resource allocated by the base station may include a coordinated beam. The coordinated beam may include: a PDSCH beam or a PUSCH beam corresponding to the position (e.g., time slot or symbol) of the resource allocated to each UE by the base station, a beam used when each UE receives a synchronization signal block (SSB), or a beam used when each UE receives a channel state information (CSI)-RS. That is, the base station may transmit at least one of the CLI-RS transmission resource ID, information about the coordinated beam, or information about the CLI-RS resource position (e.g., position within a time slot, position within a symbol, resource block (RB) position, or resource element (RE) position) to the CLI-RS transmitting UE. The base station may transmit at least one of a CLI-RS reception resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to a CLI-RS measurement UE.

[0144] According to the embodiment, reference Fig.11a, when the base station allocates resources including symbol #8 of time slot #2 to the CLI-RS transmitting UE and the CLI-RS measuring UE, information including the CLI-RS transmit / receive resource ID and information about the coordinated beam can be configured together for each UE. Each UE that has received the resource and coordinated beam information from the base station can perform CLI-RS beam coordination 1115 based on the received resource and coordinated beam information. For example, the CLI-RS transmitting UE can receive resource allocation and coordinated beam information from the base station, and the coordinated beam information can include information about the beam at the PUSCH transmit position (symbol) associated with the CLI-RS resource position (symbol) (for example, information about the PUSCH transmit beam on another symbol in the same time slot). Therefore, the CLI-RS transmitting UE can determine beam #0 as the CLI-RS transmit beam based on the received information. For example, the CLI-RS measurement UE may receive resource allocation and coordinated beam information from the base station, and the coordinated beam information may include information about the beam at the PDSCH reception position (time slot) associated with the CLI-RS resource position (time slot) (e.g., information about the PDSCH reception beam in the previous time slot). Therefore, the CLI-RS measurement UE may determine that B-#1 is the CLI-RS reception beam based on the received information. According to various embodiments of the present disclosure, the CLI-RS measurement UE and the CLI-RS transmission UE may perform CLI-RS transmission and reception based on the determined beam.

[0145] According to an embodiment of the present disclosure, the resources allocated to each UE by the base station may be mapped (or include grouping) to one beam. According to an embodiment, when at least one resource allocated to each UE by the base station does not include information about the CLI-RS beam mapped to the at least one resource, each UE may determine the CLI-RS beam by self-determination (e.g., best effort). According to an embodiment, the CLI-RS beam determined by each UE based on the resources allocated from the base station may be a single beam. According to an embodiment, the UE may determine the CLI-RS beam by itself based on the resource region allocated from the base station. According to various embodiments, in order to determine the CLI-RS beam by itself, the UE may determine the CLI-RS beam based on at least one of the PDSCH beam or PUSCH beam associated with the CLI-RS resource position, the beam used when receiving the SSB, the beam used when receiving the CSI-RS, or the beam used when transmitting the SRS. According to an embodiment, the PDSCH beam or PUSCH beam associated with the CLI-RS resource position may include a PDSCH beam or PUSCH beam in the time slot (or previous time slot) of the allocated CLI-RS resource. According to an embodiment, the UE may randomly determine the CLI-RS beam based on the allocated CLI-RS resource. The above-mentioned scheme and standard for the UE to determine the CLI-RS beam by itself are not limited thereto, and may be predefined or preconfigured by the base station according to various embodiments of the present disclosure.

[0146] According to the embodiment, reference Fig.11b , when the base station allocates resources including symbol #8 of time slot #2 to the CLI-RS transmitting UE and the CLI-RS measuring UE, a CLI-RS transmit / receive resource ID (e.g., including a CLI-RS resource position) may be configured for each UE. Each UE that has received the CLI-RS resource position from the base station may determine (1125) a CLI-RS beam based on the received resource information. For example, the CLI-RS transmitting UE may receive information about resource allocation from the base station, and may determine beam #0 as a CLI-RS transmitting beam based on the aforementioned UE self-determination. For example, the CLI-RS measuring UE may receive information about resource allocation from the base station, and may determine B-#1 as a CLI-RS receiving beam based on the aforementioned UE self-determination. According to various embodiments of the present disclosure, the CLI-RS measuring UE and the CLI-RS transmitting UE may perform CLI-RS transmission and reception based on the determined beam.

[0147] Fig.12 The UE operation flow of interference measurement and reporting based on a single beam according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.12, shows the operation flow of a CLI-RS measuring UE or a CLI-RS transmitting UE determining a CLI-RS beam based on resources allocated from a base station. In addition, the UEs hereinafter may include a CLI-RS transmitting UE that determines a CLI-RS transmitting beam to transmit a CLI-RS and a CLI-RS receiving UE that determines a CLI-RS receiving beam to receive a CLI-RS.

[0148] In step 1205, the UE may receive an allocation of resources for CLI-RS transmission and reception from the base station. Specifically, if the UE is a CLI-RS transmitting UE, the UE may receive an allocation of resources for signal transmission from the base station, or if the UE is a CLI-RS measuring (e.g., receiving) UE, the UE may receive an allocation of resources for signal reception from the base station. According to an embodiment, the resource information allocated by the base station may include information about a CLI-RS ID mapped or grouped for each resource. According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped to one or more beams. According to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station to the CLI-RS measuring or transmitting UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate a CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE.

[0149] In step 1205, the UE may determine whether a beam for CLI-RS transmission is explicitly specified in the resources allocated from the base station. Fig.12 Not shown, but Fig. 9 Step 915 may be performed before or after step 1215. For example, the UE may identify at least one CLI-RS transmit / receive beam among a plurality of available beams based on resources for transmission and reception allocated from the base station before CLI-RS beam determination.

[0150] According to an embodiment of the present disclosure, in step 1215, if a CLI-RS beam is explicitly specified from the resources allocated to the UE by the base station, step 1225 is performed. According to an embodiment, the resources allocated to each UE by the base station may be mapped (or grouped) to one beam. According to an embodiment, one resource allocated to each UE by the base station may include information about a CLI-RS beam mapped to one resource (e.g., resource ID and resource position). The CLI-RS beam mapped to one resource allocated by the base station may include a coordinated beam. The coordinated beam may include a PDSCH beam or a PUSCH beam corresponding to the position (e.g., time slot or symbol) of the resource allocated to each UE by the base station, a beam used when each UE receives a synchronization signal block (SSB), or a beam used when each UE receives a channel state information (CSI)-RS. That is, the base station may transmit at least one of a CLI-RS transmission resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to the CLI-RS transmitting UE. The base station may transmit at least one of a CLI-RS reception resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to the CLI-RS measurement UE. According to an embodiment, each UE that has received the resource and coordinated beam information from the base station may determine the CLI-RS beam based on the received resource and coordinated beam information.

[0151] In step 1225, the CLI-RS measurement UE and the CLI-RS transmission UE may perform CLI-RS transmission and reception based on the determined beam. Fig.12 Although not shown in the figure, in step 1225, the CLI-RS transmitting UE may transmit a CLI-RS to the CLI-RS measuring UE based on the determined transmit beam. In step 1225, the CLI-RS measuring UE may receive the CLI-RS from the CLI-RS transmitting UE and measure the CLI based on the received CLI-RS.

[0152] According to an embodiment of the present disclosure, in step 1215, if the CLI-RS beam is not explicitly included in the resources allocated to the UE from the base station, step 1235 is performed. According to an embodiment, the resources allocated to each UE by the base station may be mapped (or grouped) to one beam. According to an embodiment, when at least one resource allocated to each UE by the base station does not include information about the CLI-RS beam mapped to the at least one resource, each UE may determine the CLI-RS beam by self-determination (e.g., best effort). According to an embodiment, the CLI-RS beam determined by each UE based on the resources allocated from the base station may be a single beam. According to an embodiment, the UE may determine the CLI-RS beam by itself based on the resource region allocated from the base station. According to various embodiments, in order to determine the CLI-RS beam by itself, the UE may determine the CLI-RS beam based on at least one of the PDSCH beam or PUSCH beam associated with the CLI-RS resource position, the beam used when receiving the SSB, the beam used when receiving the CSI-RS, or the beam used when transmitting the SRS. According to an embodiment, the PDSCH beam or PUSCH beam associated with the CLI-RS resource position may include a PDSCH beam or PUSCH beam in the time slot (or previous time slot) of the allocated CLI-RS resource. According to an embodiment, the UE may randomly determine the CLI-RS beam based on the allocated CLI-RS resource. The above-mentioned scheme and standard for the UE to determine the CLI-RS beam by itself are not limited to this, and may be predefined or preconfigured by the base station according to various embodiments of the present disclosure. According to an embodiment, each UE that has received the CLI-RS resource position from the base station may determine the CLI-RS beam based on the received resource information. When the UE determines the CLI-RS beam in step 1235, step 1225 is performed.

[0153] In step 1225, according to various embodiments of the present disclosure, the CLI-RS measuring UE and the CLI-RS transmitting UE may perform CLI-RS transmission and reception based on the determined beam. Fig.12 Although not shown in the figure, in step 1225, the CLI-RS transmitting UE may transmit a CLI-RS to the CLI-RS measuring UE based on the determined transmit beam. In step 1225, the CLI-RS measuring UE may receive the CLI-RS from the CLI-RS transmitting UE and measure the CLI based on the received CLI-RS.

[0154] Although Fig.12 Although not shown in the figure, the CLI-RS measurement UE can perform CLI-RS measurement based on CLI-RS transmission and reception, and report CLI-RS measurement information to the base station. The CLI-RS measurement information reported by the UE can follow Figure 7 The method of step 725.

[0155] In the following, Figures 13 to 16 Operations related to CLI-RS measurements and reporting through transmission and reception of multiple CLI-RS beams are shown. Figures 13 to 16 The series of processes described in can be Figure 7 The specific details of the series of processes (steps 705 to 725) in the steps described in Figures 13 to 16 The described processes can be referred to as independent processes, or at least one of the processes can be referred to as Figure 7 One step among all the steps is mentioned.

[0156] Fig.13 The signal flow for multi-beam based interference measurement and reporting according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.13 , shows a signal flow for CLI-RS measurement and reporting between a base station 1310 and at least one UE (including a CLI-RS measuring UE 1320 and at least one CLI-RS transmitting UE 1330).

[0157] In step 1305, the base station 1310 may configure CLI measurement for the CLI-RS measurement UE 1320 and the CLI-RS transmission UE 1330. Specifically, the base station 1310 may allocate resources for reception or transmission to the CLI-RS measurement UE 1320 and the CLI-RS transmission UE 1330, respectively. According to an embodiment, the resource information allocated by the base station 1310 may include information about the CLI-RS ID mapped or grouped for each resource. According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped into one beam. According to an embodiment, the beam information may be explicitly specified in the resources allocated to each UE by the base station 1310. That is, a single beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station 1310 to the CLI-RS measurement UE 1320 or the CLI-RS transmission UE 1330. According to an embodiment, the beam information may not be specified in the resources allocated to each UE by the base station 1310. That is, the base station may only indicate the CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE. For example, if the beam is not explicitly indicated in each resource region, each UE may determine the beam corresponding to the allocated resources and the CLI-RS ID contained in the resources via self-determination or various methods even without explicit indication of the base station.

[0158] Prior to step 1315 and step 1325, the CLI-RS measurement UE 1320 and the CLI-RS transmission UE 1330 may determine a plurality of CLI-RS reception beams and a plurality of CLI-RS transmission beams, respectively. According to an embodiment, when a plurality of CLI-RS transmission and reception beams are determined, the CLI-RS transmission UE and the CLI-RS reception UE may perform beam scanning during the CLI-RS transmission and reception process. According to an embodiment, the beam scanning may include reception side beam coordination or transmission side beam coordination. According to an embodiment, the CLI-RS reception UE may receive information about a CLI-RS transmission beam (e.g., a fixed beam) from the CLI-RS transmission UE, and may identify at least one CLI-RS reception beam based on the received information. The CLI-RS reception UE may transmit information about the identified CLI-RS reception beam to the CLI-RS transmission UE. The CLI-RS reception UE may receive the CLI-RS based on the information about the CLI-RS transmission beam and the identified CLI-RS reception beam. According to an embodiment, a CLI-RS transmitting UE may receive information about a CLI-RS receiving beam (e.g., a fixed beam) from a CLI-RS receiving UE, and may identify at least one CLI-RS transmitting beam based on the received information. The CLI-RS transmitting UE may transmit information about the identified CLI-RS transmitting beam to the CLI-RS receiving UE. The CLI-RS transmitting UE may transmit the CLI-RS based on the information about the CLI-RS receiving beam and the identified CLI-RS transmitting beam. For example, during receiving side beam coordination (or scanning), the transmitting beam may be fixed, and the receiving UE may perform measurements by sequentially applying the receiving beam. Conversely, during transmitting side beam coordination, the receiving beam may be fixed, and measurements may be performed by sequentially applying the transmitting beam. In the above description, the transmitting side UE and the receiving side UE may provide each other with beam information for beam scanning (e.g., a fixed beam or a sequentially applied beam) in order to perform beam scanning. For example, for transmit side fixed, the CLI-RS transmitting UE can transmit information about the fixed beam to the CLI-RS receiving UE, and the CLI-RS receiving UE can transmit information about the sequentially changed and applied CLI-RS reception beam to the CLI-RS transmitting UE.

[0159] In step 1315, the CLI-RS transmitting UE 1330 may transmit the CLI-RS to the CLI-RS measuring UE 1320 via the CLI-RS transmission beam determined based on the resources allocated for CLI-RS transmission. According to an embodiment, the CLI-RS transmission beam determined by the CLI-RS transmitting UE 1330 or the CLI-RS reception beam determined by the CLI-RS measuring UE 1320 may include one of a plurality of beams. According to an embodiment, the CLI-RS transmission beam determined by the CLI-RS transmitting UE 1330 or the CLI-RS reception beam determined by the CLI-RS measuring UE 1320 may each include a beam indicated by the base station 1310. According to an embodiment, the CLI-RS transmission beam determined by the CLI-RS transmitting UE 1330 or the CLI-RS reception beam determined by the CLI-RS measuring UE 1320 may each include a beam determined by UE self-determination (e.g., best effort) or the like.

[0160] The CLI-RS measurement UE 1330 may transmit the CLI-RS to the CLI-RS measurement UE 1320 via one of the CLI-RS transmission beams determined based on the resources allocated for CLI-RS transmission (e.g., CLI-RS transmission beam #0 or beam #X). The CLI-RS measurement UE 1330 may provide information about the determined one beam to the CLI-RS measurement UE 1320. The CLI-RS measurement UE 1320 may receive the CLI-RS from the CLI-RS transmission UE 1330 by sequentially applying the CLI-RS reception beams (e.g., CLI-RS reception beam #0 and beam #X) determined based on the resources allocated for CLI-RS reception. The CLI-RS measurement UE 1330 may provide information about the sequentially applied reception beams to the CLI-RS transmission UE 1330. According to an embodiment, a CLI-RS transmitting UE may transmit a CLI-RS via each determined CLI-RS transmit beam, and a CLI-RS receiving UE may receive a CLI-RS transmitted by each CLI-RS transmit beam via a determined CLI-RS receive beam.

[0161] For example, in step 1315, the CLI-RS transmitting UE 1330 may transmit the CLI-RS via one of the CLI-RS transmit beams (e.g., CLI-RS transmit beam #0), and the CLI-RS measuring UE 1320 may receive the CLI-RS via at least one of the CLI-RS receive beams (e.g., CLI-RS receive beam #0 to beam #X). In addition, in step 1325, the CLI-RS transmitting UE 1330 may transmit the CLI-RS via one of the CLI-RS transmit beams (e.g., CLI-RS transmit beam #X), and the CLI-RS measuring UE 1320 may receive the CLI-RS via at least one of the CLI-RS receive beams (e.g., CLI-RS receive beam #0 to beam #X). The above steps 1315 to 1325 may be operated similarly to beam scanning according to transmit beam fixing, but are not limited thereto, and according to various embodiments of the present disclosure, beam scanning may be performed according to receive beam fixing. According to an embodiment, the CLI-RS measurement UE 1320 may perform CLI measurement based on the CLI-RS received from the CLI-RS transmitting UE 1330.

[0162] In step 1335, the CLI-RS measurement UE 1320 may report the measured CLI information to the base station 1310. According to various embodiments of the present disclosure, the CLI-RS measurement UE 1320 may report the CLI-RS measurement information to the base station 1310 through various methods. According to an embodiment, the CLI-RS measurement UE 1320 may report the CLI-RS measurement information to the base station 1310 by using a CLI-RS reporting resource allocated from the base station 3010. Hereinafter, a reporting method that the CLI-RS measurement UE 1320 may determine is described.

[0163] Method 1) Full CLI Report: CLI-RS Measurement The UE 1320 may report to the base station 1310 all information about at least one beam pair used for CLI-RS transmission and reception.

[0164] Method 2) Minimum CLI reporting: The CLI-RS measurement UE 1020 may report to the base station 1310 a CLI-RS index indicating at least one beam pair having the smallest interference value among the measured CLI values. The index of at least one beam pair having the smallest interference value reported by the CLI-RS measurement UE 1320 may be an index of at least one beam pair based on a CLI-RS received from at least one CLI-RS transmitting UE. According to an embodiment, the information reported by the CLI-RS measurement UE 1320 may be an index of at least one beam pair including a beam pair having the Nth lowest interference value and an index for the beam pair having the lowest interference value. According to an embodiment, the N value may be pre-configured by the base station.

[0165] Method 3) CLI average value reporting: CLI-RS measurement The UE 1320 may calculate an average value of interference values ​​of all at least one beam pair used for CLI-RS transmission and reception, and report information about the average value to the base station 1310 .

[0166] Method 4) CLI report by threshold comparison: The CLI-RS measurement UE 1320 may report the interference value of at least one beam pair for CLI-RS transmission and reception to the base station 1310 based on the threshold. Specifically, according to an embodiment, the CLI-RS measurement UE 1320 may report information about one or more beam pairs whose interference values ​​are equal to or less than the threshold and their index information to the base station 1310. According to an embodiment, the threshold may be pre-configured by the base station 1310 or may be pre-defined in the UE itself.

[0167] Method 5) Blacklist report: The CLI-RS measurement UE 1320 may determine the index of a portion of at least one beam pair used for CLI-RS transmission and reception as a blacklist, and report the blacklist. Specifically, the CLI-RS measurement UE 1320 may determine the blacklist as one or more beam pairs with higher interference values, and report the blacklist to the base station 1310, and the base station 1310 may schedule the transmission and reception of data channels other than the one or more beam pairs included in the blacklist. According to an embodiment, the CLI-RS measurement UE 1320 may determine the blacklist as one or more beam pairs with interference values ​​equal to or greater than the reference interference value based on a specific reference interference value, and the reference interference value may be configured by the base station or may be predefined in the UE itself. However, the method of determining the blacklist according to various embodiments of the present disclosure is not limited thereto, and may include various methods, such as determining the blacklist as one or more beam pairs for which a specific event has occurred.

[0168] As described above, the CLI-RS measurement UE 1320 may determine at least one of methods 1) to 5) based on various reasons such as feedback overhead, and may report CLI-RS measurement information to the base station 1310 via the determined method. However, according to various embodiments of the present disclosure, the CLI-RS measurement information is not limited to being reported according to a separate method, and the CLI-RS measurement UE 1320 may report the CLI-RS measurement information to the base station 1310 via at least one of methods 1) to 5) or a combination thereof.

[0169] Fig.14a and Fig.14b An example of determining a multi-beam for interference measurement according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.14a and Fig.14b , showing an example in which a CLI-RS measurement UE and a CLI-RS transmission UE respectively determine a CLI-RS reception beam and a CLI-RS transmission beam as a single beam based on resource allocation from a base station.

[0170] According to various embodiments of the present disclosure, the base station may allocate resources for reception and transmission to the CLI-RS measurement UE and the CLI-RS transmission UE, respectively. According to an embodiment, the resource information allocated by the base station may include information about the CLI-RS ID mapped or grouped for each resource. According to an embodiment, the resources allocated by the base station to each UE may be mapped or grouped to one beam.

[0171] According to an embodiment of the present disclosure, a plurality of resources allocated by a base station to each UE may be mapped (or grouped) to a plurality of beams, respectively. According to an embodiment, a plurality of resources allocated by a base station to each UE may include information about a CLI-RS beam mapped to a plurality of resources (e.g., a resource ID and a resource position). A CLI-RS beam mapped to a plurality of resources allocated by a base station may include a coordination beam. A coordination beam may include a PDSCH beam or a PUSCH beam corresponding to a position (e.g., a time slot or a symbol) of a resource allocated by a base station to each UE, a beam used when each UE receives a synchronization signal block (SSB), or a beam used when each UE receives a channel state information (CSI)-RS. That is, the base station may transmit a CLI-RS transmission resource ID, information about a coordination beam, or at least one of information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to a CLI-RS transmitting UE. The base station may transmit at least one of a CLI-RS reception resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to a CLI-RS measurement UE.

[0172] According to the embodiment, reference Fig.14a, when the base station allocates resources including symbol #7 of time slot #2 and resources including symbol #9 of time slot #2 to the CLI-RS transmitting UE and the CLI-RS measuring UE, information including the CLI-RS transmit / receive resource ID and information about the coordinated beam can be configured together for each UE. According to an embodiment, the information about the coordinated beam configured by the base station can be mapped to each resource separately. Each UE that has received the resource including symbol #7 of time slot #2 and the information about the coordinated beam mapped thereto from the base station can coordinate (1415 and 1417) the CLI-RS beam based on the received resources and the coordinated beam information. In addition, each UE that has received the resource including symbol #9 of time slot #2 and the information about the coordinated beam mapped thereto from the base station can coordinate (1417) the CLI-RS beam based on the received resources and the coordinated beam information. For example, a CLI-RS transmitting UE may receive resource allocation and information about a coordinated beam mapped thereto from a base station, and the coordinated beam information may include information about a beam at a PUSCH transmit position (symbol) associated with a CLI-RS resource position (symbol) (e.g., information about a PUSCH transmit beam on another symbol in the same time slot). For example, a CLI-RS measuring UE may receive resource allocation and coordinated beam information from a base station, and the coordinated beam information may include information about a beam at a PDSCH receive position (time slot) associated with a CLI-RS resource position (time slot) (e.g., information about a PDSCH receive beam in a previous time slot). According to an embodiment, the CLI-RS transmitting UE may determine (1415) based on the received information that the CLI-RS transmit beam is beam #0 mapped to resources including symbol #7 of time slot #2. According to an embodiment, the CLI-RS measuring UE may determine (1415) based on the received information that the CLI-RS receive beam is B-#1 mapped to resources including symbol #7 of time slot #2. In addition, according to an embodiment, the CLI-RS transmitting UE may determine (1417) based on the received information that the CLI-RS transmission beam is beam #1 mapped to the resource including symbol #9 of time slot #2. According to an embodiment, the CLI-RS measuring UE may determine (1417) based on the received information that the CLI-RS reception beam is B-#0 mapped to the resource including symbol #9 of time slot #2. According to various embodiments of the present disclosure, the CLI-RS measuring UE and the CLI-RS transmitting UE may perform CLI-RS transmission and reception based on the determined beam.

[0173] According to an embodiment of the present disclosure, resources allocated to each UE by a base station may be mapped (or grouped) to one beam. According to an embodiment, when a plurality of resources allocated to each UE by a base station does not include information about a CLI-RS beam mapped to a plurality of resources, each UE may determine a CLI-RS beam by self-determination (e.g., best effort). According to an embodiment, a CLI-RS beam determined by each UE based on a plurality of resources allocated from a base station may be one beam for each resource.

[0174] According to an embodiment, the UE may determine the CLI-RS beam by itself based on the resource region allocated from the base station. According to various embodiments, in order to determine the CLI-RS beam by itself, the UE may determine the CLI-RS beam based on at least one of the PDSCH beam or PUSCH beam associated with the CLI-RS resource position, the beam used when receiving SSB, the beam used when receiving CSI-RS, or the beam used when transmitting SRS. According to an embodiment, the PDSCH beam or PUSCH beam associated with the CLI-RS resource position may include a PDSCH beam or PUSCH beam in the time slot (or the previous time slot) of the allocated CLI-RS resource. According to an embodiment, the UE may randomly determine the CLI-RS beam based on the allocated CLI-RS resource. The above-mentioned scheme and standard for the UE to determine the CLI-RS beam by itself are not limited thereto, and may be predefined or preconfigured by the base station according to various embodiments of the present disclosure.

[0175] According to the embodiment, reference Fig.11b , when the base station allocates resources including symbol #7 of time slot #2 and resources including symbol #9 of time slot #2 to the CLI-RS transmitting UE and the CLI-RS measuring UE, a CLI-RS transmit / receive resource ID (e.g., including a CLI-RS resource position) may be configured for each UE. Each UE that has received the CLI-RS resource position from the base station may determine (1425 and 1427) a CLI-RS beam based on the received resource information. According to an embodiment, the CLI-RS transmitting UE may receive information about resource allocation including symbol #7 of time slot #2 from the base station, and may determine (1425) beam #0 as a CLI-RS transmit beam based on the above-mentioned UE self-determination.

[0176] According to an embodiment, the CLI-RS measurement UE may receive information about resource allocation including symbol #7 of time slot #2 from a base station, and may determine 1425B-#1 as a CLI-RS receive beam based on the above UE self-determination. In addition, according to an embodiment, the CLI-RS transmitting UE may receive information about resource allocation including symbol #9 of time slot #2 from a base station, and may determine (1427) beam #2 as a CLI-RS transmit beam based on the above UE self-determination. According to an embodiment, the CLI-RS measurement UE may receive information about resource allocation including symbol #9 of time slot #2 from a base station, and may determine 1427B-#0 as a CLI-RS receive beam based on the above UE self-determination. According to an embodiment, a beam determined based on resource allocation including symbol #9 of time slot #2 may be determined in a direction different from a beam determined based on resource allocation including symbol #9 of time slot #2. According to various embodiments of the present disclosure, the CLI-RS measurement UE and the CLI-RS transmitting UE may perform CLI-RS transmission and reception based on the determined beam.

[0177] According to various embodiments of the present disclosure, although Fig.14a and Fig.14b An example of allocating resources including symbol #7 of slot #2 and resources including symbol #9 of slot #2 is shown, but the present disclosure is not limited thereto. The number of resource regions and resources allocated by the base station may be plural, and therefore it is obvious that the number of CLI-RS beams selected by the UE may also be plural.

[0178] Fig.15 An example of measuring interference via beam scanning based on multi-beams according to various embodiments of the present disclosure is shown. Specifically, referring to Fig.15 , showing various examples of CLI-RS transmission and measurement between a CLI-RS transmitting UE and a CLI-RS measuring UE.

[0179] According to an embodiment, the base station may allocate multiple resources for transmission and reception to the CLI-RS transmitting UE and the CLI-RS measuring UE. According to an embodiment, the multiple resources for transmission and reception allocated to each UE may include information about the mapped CLI-RS beam. Fig.14a The operation of the UE determining the mapped CLI-RS beam is specifically shown in FIG. According to an embodiment, each UE may determine the CLI-RS beam mapped to each beam by itself based on a plurality of resources allocated for transmission and reception. Fig.14a The operation of the UE determining the CLI-RS beam by itself is specifically shown in FIG. 15. For example, the base station may allocate (1510) resources of symbols #7 and #9 of time slot #2 and resources of symbols #7 and #9 of time slot #4 to each UE.

[0180] According to an embodiment, each UE allocated with a plurality of resources may determine a CLI-RS beam based on the allocated resources. According to an embodiment, each UE may determine a CLI-RS beam based on information about a CLI-RS beam mapped to a plurality of resources. According to an embodiment, each UE may determine a CLI-RS transmit beam and a CLI-RS receive beam mapped to corresponding beams based on the allocated plurality of resources for transmission and reception.

[0181] According to an embodiment, each UE may perform CLI-RS transmission and reception via beam scanning based on the determined CLI-RS transmission beam and CLI-RS reception beam 1520. According to an embodiment, transmission and reception in which the CLI-RS transmission beam is fixed and the CLI-RS reception beam is scanned may be performed (1521). According to an embodiment, transmission and reception in which the CLI-RS reception beam is fixed and the CLI-RS transmission beam is scanned may be performed (1523). However, this is merely an example, and the present disclosure is not limited thereto. Each UE may perform CLI-RS beam transmission and reception via various methods (for example, transmission and reception via any CLI-RS beam). The above-mentioned beam scanning may be performed with Figure 7 Step 715 is basically the same.

[0182] According to an embodiment, the CLI-RS transmitting UE and the CLI-RS measuring UE may determine beam #0 as the CLI-RS transmitting beam and determine B-#0, B-#1, B-#2, and B-#3 as CLI-RS receiving beams based on resource 1533 of symbol #7 of time slot #2, resource 1534 of symbol #7 of time slot #4, resource 1535 of symbol #9 of time slot #2, and resource 1536 of symbol #9 of time slot #4, respectively. That is, by determining that the number of CLI-RS receiving beams available for one CLI-RS transmitting beam is four, CLI-RS transmission and reception may be performed for each beam pair according to CLI-RS transmitting beam fixing and CLI-RS receiving beam scanning. According to an embodiment, as described above, the CLI-RS transmitting and receiving beams of each UE may be determined based on beams explicitly specified by the base station or based on UE self-determination.

[0183] According to an embodiment, the CLI-RS transmitting UE and the CLI-RS measuring UE may determine beam #0, beam #1, beam #2, and beam #3 as CLI-RS transmit beams and determine B-#0 as a CLI-RS receive beam based on resource 1543 of symbol #7 of time slot #2, resource 1544 of symbol #7 of time slot #4, resource 1545 of symbol #9 of time slot #2, and resource 1546 of symbol #9 of time slot #4, respectively. That is, by determining that the number of CLI-RS transmit beams available for one CLI-RS receive beam is four, CLI-RS transmission and reception may be performed for each beam pair according to CLI-RS receive beam fixing and CLI-RS transmit beam scanning. According to an embodiment, as described above, the CLI-RS transmit and receive beams of each UE may be determined based on beams explicitly specified by the base station or based on UE self-determination.

[0184] According to an embodiment, a CLI-RS receiving UE may receive information about a CLI-RS transmit beam (e.g., a fixed beam) from a CLI-RS transmitting UE, and may identify at least one CLI-RS receiving beam based on the received information. The CLI-RS receiving UE may transmit information about the identified CLI-RS receiving beam to the CLI-RS transmitting UE. The CLI-RS receiving UE may receive the CLI-RS based on the information about the CLI-RS transmitting beam and the identified CLI-RS receiving beam. According to an embodiment, a CLI-RS transmitting UE may receive information about a CLI-RS receiving beam (e.g., a fixed beam) from a CLI-RS receiving UE, and may identify at least one CLI-RS transmitting beam based on the received information. The CLI-RS transmitting UE may transmit information about the identified CLI-RS transmitting beam to the CLI-RS receiving UE. The CLI-RS transmitting UE may transmit the CLI-RS based on the information about the CLI-RS receiving beam and the identified CLI-RS transmitting beam.

[0185] Fig.16 The UE operation flow of multi-beam based interference measurement and reporting according to various embodiments of the present disclosure is shown. Specifically, refer to Fig.16 , shows the operation flow of a CLI-RS measuring UE or a CLI-RS transmitting UE determining a CLI-RS beam based on resources allocated from a base station. In addition, the UEs hereinafter may include a CLI-RS transmitting UE that determines a CLI-RS transmitting beam to transmit a CLI-RS and a CLI-RS receiving UE that determines a CLI-RS receiving beam to receive a CLI-RS.

[0186] In step 1605, the UE may receive an allocation of resources for CLI-RS transmission and reception from the base station. Specifically, if the UE is a CLI-RS transmitting UE, the UE may receive an allocation of resources for signal transmission from the base station, or if the UE is a CLI-RS measuring (e.g., receiving) UE, the UE may receive an allocation of resources for signal reception from the base station. According to an embodiment, the resource information allocated by the base station may include information about a CLI-RS ID mapped or grouped for each resource. According to an embodiment, the resources allocated to each UE by the base station may be mapped or grouped to one or more beams. According to an embodiment, beam information may be explicitly specified in the resources allocated to each UE by the base station. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station to the CLI-RS measuring or transmitting UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate a CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE.

[0187] In step 1615, the UE may determine whether a beam for CLI-RS transmission is explicitly specified in the resources allocated from the base station. Fig.16 Not shown, but Fig. 9 Step 915 may be performed before or after step 1615. For example, the UE may identify at least one CLI-RS transmit / receive beam among a plurality of available beams based on resources for transmission and reception allocated from the base station before CLI-RS beam determination.

[0188] According to an embodiment of the present disclosure, in step 1615, if a CLI-RS beam is explicitly specified from a plurality of resources allocated to the UE by the base station, step 1625 is performed. According to an embodiment, the resources allocated to each UE by the base station may be mapped (or grouped) to one beam. According to an embodiment, the plurality of resources allocated to each UE by the base station may include information about the CLI-RS beam mapped to the plurality of resources (e.g., resource ID and resource position). The CLI-RS beam mapped to the plurality of resources allocated by the base station may include a coordinated beam. The coordinated beam may include a PDSCH beam or a PUSCH beam corresponding to the position (e.g., time slot or symbol) of the resources allocated to each UE by the base station, a beam used when each UE receives a synchronization signal block (SSB), or a beam used when each UE receives a channel state information (CSI)-RS. That is, the base station may transmit at least one of a CLI-RS transmission resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to a CLI-RS transmitting UE. The base station may transmit at least one of a CLI-RS reception resource ID, information about a coordinated beam, or information about a CLI-RS resource position (e.g., a position within a time slot, a position within a symbol, a resource block (RB) position, or a resource element (RE) position) to a CLI-RS measurement UE. According to an embodiment, each UE that has received a plurality of resources and coordinated beam information from the base station may determine a plurality of CLI-RS beams based on the received plurality of resources and coordinated beam information.

[0189] In step 1625, the CLI-RS measurement UE and the CLI-RS transmission UE may perform CLI-RS transmission and reception based on the determined multiple beams. According to an embodiment, each UE may perform CLI-RS transmission and reception via the determined CLI-RS beam. According to an embodiment, transmission and reception in which the CLI-RS transmission beam is fixed and the CLI-RS reception beam is scanned may be performed. According to an embodiment, transmission and reception in which the CLI-RS reception beam is fixed and the CLI-RS transmission beam is scanned may be performed. However, this is merely an example, and the present disclosure is not limited thereto. Each UE may perform CLI-RS beam transmission and reception via various methods (for example, transmission and reception via any CLI-RS beam). Figure 7 , Fig.14a and Fig.14b Detailedly illustrated in FIG. 1 is CLI-RS transmission and reception and CLI-RS measurement via multiple CLI-RS transmission beams or CLI-RS reception beams.

[0190] According to an embodiment of the present disclosure, in step 1615, if the CLI-RS beam is not explicitly included in the resources allocated to the UE from the base station, step 1635 is performed. According to an embodiment, the resources allocated to each UE by the base station may be mapped (or grouped) to one beam. According to an embodiment, when the multiple resources allocated to each UE by the base station do not include information about the CLI-RS beam mapped to the multiple resources, each UE may determine the CLI-RS beam by self-determination (e.g., best effort). According to an embodiment, the UE may determine the CLI-RS beam by itself based on the resource region allocated from the base station. According to various embodiments, in order to determine the CLI-RS beam by itself, the UE may determine the CLI-RS beam based on at least one of the PDSCH beam or PUSCH beam associated with the CLI-RS resource position, the beam used when receiving the SSB, the beam used when receiving the CSI-RS, or the beam used when transmitting the SRS. According to an embodiment, the PDSCH beam or PUSCH beam associated with the CLI-RS resource position may include a PDSCH beam or PUSCH beam in the time slot (or previous time slot) of the allocated CLI-RS resource. According to an embodiment, the UE may randomly determine the CLI-RS beam based on the allocated CLI-RS resource. The above-mentioned scheme and standard for the UE to determine the CLI-RS beam by itself are not limited to this, and may be predefined or preconfigured by the base station according to various embodiments of the present disclosure. According to an embodiment, each UE that has received the CLI-RS resource position from the base station may determine the CLI-RS beam based on the received resource information. When the UE determines the CLI-RS beam in step 1635, step 1625 is performed.

[0191] In step 1625, according to various embodiments of the present disclosure, the CLI-RS measurement UE and the CLI-RS transmission UE may perform CLI-RS transmission and reception based on the determined multiple beams. According to an embodiment, each UE may perform CLI-RS transmission and reception via the determined CLI-RS beam. According to an embodiment, transmission and reception in which the CLI-RS transmission beam is fixed and the CLI-RS reception beam is scanned may be performed. According to an embodiment, transmission and reception in which the CLI-RS reception beam is fixed and the CLI-RS transmission beam is scanned may be performed. However, this is merely an example, and the present disclosure is not limited thereto. Each UE may perform CLI-RS beam transmission and reception via various methods (for example, transmission and reception via any CLI-RS beam). Figure 7 , Fig.14a and Fig.14b Detailedly illustrated in FIG. 1 is CLI-RS transmission and reception and CLI-RS measurement via multiple CLI-RS transmission beams or CLI-RS reception beams.

[0192] In step 1645, the CLI-RS measurement UE may perform CLI-RS measurement on each CLI-RS beam pair based on the CLI-RS received from the CLI-RS transmitting UE, and may report the CLI-RS measurement information to the base station. The CLI-RS measurement information reported by the UE may follow Figure 7 The method of step 725.

[0193] In the following, Fig.17 and Fig.18 Data channel scheduling and data channel transmission and reception based on CLI-RS measurements and reports are shown. Fig.17 and Fig.18 The series of processes described in can be Figure 7 The specific details of the series of processes (steps 735 to 755) in the steps described in Fig.17 and Fig.18 The described processes can be referred to as independent processes, or at least one of the processes can be referred to as Figure 7 One step among all the steps is mentioned.

[0194] Fig.17 Signal flows for scheduling data channel transmission and reception based on interference measurements according to various embodiments of the present disclosure are shown.

[0195] In step 1705, the base station 1710 may determine a beam for downlink reception and a beam for uplink transmission based on a measurement result or a channel quality indicator (CQI) value reported from a CLI-RS measurement UE. The base station 1710 may provide coordinated scheduling information to a DL UE 1720 or a UL UE 1730 based on information about the determined beam. According to an embodiment, the base station 1710 may schedule a PDUSCH or a PUSCH to the DL UE or the UL UE at the same time. According to an embodiment, the base station 1710 may coordinately schedule the DL UE 1720 or the UL UE 1730 to use a beam used by a CLI-RS transmitting UE and a CLI-RS receiving UE during CLI-RS transmission and reception. Specifically, the base station 1710 may coordinately schedule the DL UE 1720 or the UL UE 1730 by using a CLI-RS index. The CLI-RS index used by the base station 1710 may indicate a reception beam for PDSCH reception or a transmission beam for PUSCH transmission. Fig.17 , the present disclosure describes PDSCH and PUSCH, but the present disclosure is not limited thereto and may include various downlink or uplink signals. According to an embodiment, the DL UE 1720 may include a CLI-RS measurement UE or a CLI-RS transmission UE, and the UL UE 1730 may also include a CLI-RS measurement UE or a CLI-RS transmission UE.

[0196] Specifically, in step 1705, the base station 1710 may schedule the UE 1720 for DL ​​reception or the UE 1730 for UL transmission based on the CLI-RS measurement information. According to an embodiment, in addition to the CLI-RS measurement information reported from the CLI-RS measurement UE, the base station 1710 may also perform scheduling based on a channel quality indicator (CQI) reported from at least one UE. Specifically, the base station 1710 may instruct the UE to use the beam used during the CLI-RS measurement for DL ​​or UL. For example, the base station 1710 may determine the best beam pair based on the reported CLI-RS measurement information, and may configure or schedule the beam direction so that the UE may transmit and receive a data channel, etc. via the determined best beam pair. The base station 1710 may use the CLI-RS index to indicate the transmit and receive beams used during DL / UL signal transmission and reception. According to an embodiment, the base station 1710 may schedule UL transmission (e.g., PUSCH) for a CLI-RS transmitting UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS transmitting beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS transmitting UE for CSI-RS transmission. Alternatively, the base station 1710 may schedule DL transmission (e.g., PDSCH) for a CLI-RS measuring UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS receiving beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS measuring UE for CSI-RS reception. According to an embodiment, the base station 1710 may estimate UE-to-UE CLI based on the reported CLI-RS measurement information, and may perform FD cooperative scheduling between UEs with low CLI values. According to an embodiment, the base station 1710 may estimate the CLI between the beam pairs of the UE based on the reported CLI-RS measurement information, and may perform FD co-scheduling for the beam pairs having low CLI values.

[0197] However, the above examples are only examples, and the present disclosure is not limited thereto. For example, there may be a situation where channel reciprocity is satisfied, for example, there may be a situation where the condition is satisfied, wherein even if the downlink transmit / receive beam pair of the base station and the UE is used as an uplink transmit / receive beam pair, the channel quality is generally not significantly affected. According to an embodiment, in various situations including a situation where channel reciprocity is satisfied, the base station 1710 may schedule UL transmission (e.g., PUSCH) for a CLI-RS measurement UE, and schedule DL reception (e.g., PDSCH) for a CLI-RS transmission UE, differently from the above scheduling, by indicating an index for a CLI-RS receive beam, by indicating an index for a CLI-RS transmit beam.

[0198] According to an embodiment, for data transmission and reception via a single link between the base station 1710 and each UE, beam indication signaling for indicating the best beam pair may be performed separately. For example, the base station and the UE may use a reference signal to determine an appropriate transmit / receive beam pair via beam management, beam scanning, etc. Referring to the 5G NR standard specification, the base station may transmit a transmission configuration indication (TCI) state including a beam indication via downlink control information (DCI) to inform the UE that the downlink signal is being transmitted on the same beam as the configured RS. Therefore, according to various embodiments of the present disclosure, the beam indication signaling used for the above-mentioned single link communication may need to be distinguished from the CLI-RS-based beam indication signaling. According to various embodiments of the present disclosure, as in an FD base station environment, in an asymmetric full-duplex system in which DL or UL is collaboratively scheduled for at least one UE, additional L1 signaling or radio resource control (RRC) signaling may be used separately from the existing beam indication signaling to perform beam indication scheduling that minimizes interference between the links of the corresponding UE. According to an embodiment, the base station 1710 may configure a beam for a data channel by using an additional individual bit of the DCI to schedule data channel transmission and reception of each UE by using a CLI-RS index. According to an embodiment, during scheduling data channel transmission and reception of each UE without using an additional individual bit, the base station 1710 may configure a beam for a data channel by a method of separately configuring a bandwidth part (BWP).

[0199] In step 1715, the DL UE 1720 that has been scheduled for PDSCH by the base station 1710 can determine the beam (on which the UE should operate) configured according to the CLI-RS ID for a specific time point based on the received beam index (e.g., CLI-RS resource number) for CLI-RS reception, and can determine the determined beam as a receiving beam for data channel reception. The UL UE 1730 that has been scheduled for PUSCH by the base station 1710 can determine the beam (on which the UE should operate) configured according to the CLI-RS ID for a specific time point based on the received beam index (e.g., CLI-RS resource number) for CLI-RS transmission, and can determine the determined beam as a transmitting beam for data channel transmission. However, according to various embodiments of the present disclosure (but not limited thereto), when channel reciprocity can be considered as above, the DL UE 1720 can be a CLI-RS transmitting UE, and the UL UE 1730 can be a CLI-RS measuring UE. Although Fig.17 Not shown, but according to an embodiment, each UE can not only receive a CLI-RS beam index, but also receive a beam indication indicating a beam pair via a single link, and the base station can individually configure one of multiple beam indications, which will be used to determine the data channel transmit / receive beam.

[0200] In step 1725, each UE may transmit or receive a data channel signal by using a configured transmit beam or receive beam. According to an embodiment, the DL UE 1720 may receive a PDSCH transmitted from a base station in a configured receive beam direction, or the UL UE 1730 may transmit a PUSCH to a base station in a configured transmit beam direction. However, but not limited thereto, according to an embodiment, when channel reciprocity may be considered, the DL UE 1720 may be a CLI-RS transmitting UE, and the UL UE 1730 may be a CLI-RS measuring UE. According to various embodiments of the present disclosure, a signal transmitted and received by each UE will be referred to as FD PUSCH or FD PDSCH, but not limited thereto, and the signal may include various signals (sounding reference signal (SRS), physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), and demodulation reference signal (DMRS)) in addition to a data channel.

[0201] Fig.18 The operation flow of a base station for receiving an interference measurement report from a UE and performing scheduling in an FD system according to various embodiments of the present disclosure is shown.

[0202] In step 1805, the base station may configure CLI measurement for the CLI-RS measurement UE and at least one CLI-RS transmitting UE. Specifically, the base station may allocate at least one resource for CLI-RS reception or transmission to the CLI-RS measurement UE and at least one CLI-RS transmitting UE, respectively. According to an embodiment, the information about the resources allocated by the base station may include information about a CLI-RS ID (or index) mapped or grouped for each resource. According to an embodiment, the resources allocated by the base station to each UE may be mapped or grouped to one or more beams. Each UE may identify the number of resources allocated to each UE by the base station, and the process thereof may be similar to Fig. 9 The operations specifically described in . According to an embodiment, beam information may be explicitly specified in the resources allocated by the base station to each UE. That is, at least one beam may be mapped or grouped in the resources for CLI-RS reception or transmission allocated by the base station to the CLI-RS measurement UE or at least one CLI-RS transmission UE, but the present disclosure is not limited thereto. According to various embodiments of the present disclosure, the base station may only indicate a CLI-RS resource identifier (ID) for allocating resources, and at least one beam to be mapped or grouped may be determined by the UE. The above process may be similar to Fig.12 or Fig.16 The operations are described in detail in .

[0203] In step 1815, the base station may receive measured CLI information from the CLI-RS measurement UE. According to an embodiment, the CLI-RS measurement UE may report the CLI-RS measurement information to the base station by using a CLI-RS reporting resource allocated from the base station. According to various embodiments of the present disclosure, the base station may receive a report of the CLI-RS measurement information from the CLI-RS measurement UE by various methods. The method for the base station to receive the CLI-RS measurement information from the CLI-RS measurement UE may include: Figure 7 At least one of the methods 1) to 5) described in step 725 or a combination thereof. According to various embodiments of the present disclosure, the CLI-RS measurement information reported to the base station may include: Figures 9 to 16 Information measured by various methods or combinations thereof for CLI-RS transmission and reception and CLI-RS measurement described in.

[0204] In step 1825, the base station may determine a beam for DL ​​reception and a beam for UL transmission based on the CLI-RS measurement information. The base station may provide coordinated scheduling information to the UE for DL ​​and the UE for UL based on the information about the determined beam for DL ​​reception and the beam for UL reception. According to an embodiment, in addition to the CLI-RS measurement information reported from the CLI-RS measurement UE, the base station may also perform scheduling based on a channel quality indicator (CQI) reported from at least one UE. Specifically, the base station may instruct the UE to use the beam used during the CLI-RS measurement for DL ​​or UL. For example, the base station may determine the best beam pair based on the reported CLI-RS measurement information, and may configure or schedule the beam direction so that the UE can transmit and receive data channels, etc. via the determined best beam pair. The base station may use the CLI-RS index to indicate the transmit and receive beams used during DL / UL signal transmission and reception. According to an embodiment, the base station may schedule UL transmission (e.g., PUSCH) for a CLI-RS transmitting UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS transmitting beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS transmitting UE for CSI-RS transmission. Alternatively, the base station may schedule DL transmission (e.g., PDSCH) for a CLI-RS measuring UE by indicating an index (e.g., CLI-RS resource number) for a CLI-RS receiving beam including a beam pair determined to be capable of minimizing interference in at least one beam used by the CLI-RS measuring UE for CSI-RS reception. According to an embodiment, the base station may estimate UE-to-UE CLI based on the reported CLI-RS measurement information, and may perform FD coordinated scheduling between UEs with low CLI values. According to an embodiment, the base station may estimate CLI between beam pairs of UEs based on the reported CLI-RS measurement information, and may perform FD coordinated scheduling for beam pairs with low CLI values.

[0205] However, the above examples are only examples, and the present disclosure is not limited thereto. For example, there may be a situation where channel reciprocity is satisfied, for example, there may be a situation where the condition is satisfied, wherein even if the downlink transmit / receive beam pair of the base station and the UE is used as an uplink transmit / receive beam pair, the channel quality is generally not significantly affected. According to an embodiment, in various situations including a situation where channel reciprocity is satisfied, the base station may schedule UL transmission (e.g., PUSCH) for the CLI-RS measurement UE 720 by indicating an index for the CLI-RS receive beam, and schedule DL reception (e.g., PDSCH) for the CLI-RS transmission UE by indicating an index for the CLI-RS transmit beam, which is different from the above scheduling.

[0206] According to an embodiment, for data transmission and reception via a single link between a base station and each UE, beam indication signaling for indicating the best beam pair may be performed separately. For example, the base station and the UE may use a reference signal to determine an appropriate transmit / receive beam pair via beam management, beam scanning, etc. Referring to the 5G NR standard specification, the base station may transmit a transmission configuration indication (TCI) state including a beam indication via downlink control information (DCI) to inform the UE that the downlink signal is being transmitted on the same beam as the configured RS. Therefore, according to various embodiments of the present disclosure, the beam indication signaling used for the above-mentioned single link communication may need to be distinguished from the CLI-RS-based beam indication signaling. According to various embodiments of the present disclosure, as in an FD base station environment, in an asymmetric full-duplex system in which DL or UL is collaboratively scheduled for at least one UE, additional L1 signaling or radio resource control (RRC) signaling may be used separately from the existing beam indication signaling to perform beam indication scheduling that minimizes interference between the links of the corresponding UEs. According to an embodiment, the base station may configure a beam for a data channel by using an additional individual bit of the DCI to schedule data channel transmission and reception of each UE by using a CLI-RS index. According to an embodiment, during scheduling data channel transmission and reception of each UE without using an additional individual bit, the base station may configure a beam for a data channel by a method of separately configuring a bandwidth part (BWP).

[0207] According to the embodiment, although Fig.18 Although not shown in the figure, the base station enables each UE to transmit or receive a data channel signal by using a transmit beam or a receive beam based on a scheduling configuration. According to an embodiment, a DL UE may receive a PDSCH transmitted from the base station in the configured receive beam direction, or a UL UE may transmit a PUSCH to the base station in the configured transmit beam direction. According to various embodiments of the present disclosure, the signal transmitted and received by each UE will be referred to as FD PUSCH or FDPDSCH, but is not limited thereto, and the signal may include various signals (sounding reference signal (SRS), physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), and demodulation reference signal (DMRS)) in addition to the data channel.

[0208] According to various embodiments of the present disclosure, a method performed by a UE supporting a full-duplex (FD) system in a wireless communication system may include: receiving an allocation of resources for receiving at least one cross-linked interference reference signal (CLI-RS) from a base station; determining at least one CLI-RS receiving beam from multiple available beams based on the allocated resources; receiving the CLI-RS from at least one other UE based on the at least one CLI-RS receiving beam; measuring interference with at least one other UE based on the received CLI-RS; transmitting measurement information generated based on the measurement result to the base station; receiving coordinated scheduling information from the base station according to the downlink receiving beam determined based on the measurement information; and receiving a downlink signal from the base station via the downlink receiving beam determined based on the coordinated scheduling information.

[0209] According to an embodiment, the method may further include: determining whether resources for multiple CLI-RS reception beams have been allocated based on the allocated resources, and when resources for multiple CLI-RS reception beams have been allocated, determining multiple CLI-RS reception beams based on the resources.

[0210] According to an embodiment, the method may further include: performing beam scanning to receive the CLI-RS based on the determined plurality of CLI-RS reception beams.

[0211] According to an embodiment, performing beam scanning to receive CLI-RS may also include: receiving CLI-RS transmit beam information from at least one other UE, identifying multiple CLI-RS receive beams based on the received transmit beam information, transmitting information about the identified CLI-RS receive beam to at least one other UE, and receiving CLI-RS via the CLI-RS transmit beam information and the identified multiple CLI-RS receive beams.

[0212] According to an embodiment, determining at least one CLI-RS receive beam among multiple available beams based on the allocated resources may also include: based on the allocated resources, when a predetermined CLI-RS beam can be identified, determining the indicated CLI-RS beam as the CLI-RS receive beam, and based on the allocated resources, when no predetermined CLI-RS beam can be identified, determining the CLI-RS receive beam based on the allocated resources and a specific criterion.

[0213] According to an embodiment, determining the indicated CLI-RS beam as the CLI-RS receive beam may include: receiving information about a coordinated beam mapped to allocated resources; and determining the CLI-RS receive beam based on the received information about the coordinated beam, wherein the coordinated beam includes at least one of a physical uplink shared channel (PUSCH) beam, a physical downlink shared channel (PDSCH) beam, a beam used when a synchronization signal block (SSB) is received, or a beam used when a channel state information reference signal (CSI-RS) is received, and the coordinated beam corresponds to the location of the allocated resources.

[0214] According to an embodiment, determining the CLI-RS reception beam based on the allocated resources and a specific criterion may include determining the CLI-RS reception beam based on a PDSCH beam or a PUSCH beam associated with a location of the allocated resources.

[0215] According to various embodiments of the present disclosure, a method performed by a base station supporting a full-duplex (FD) system in a wireless communication system may include: allocating resources for receiving at least one cross-linked interference reference signal (CLI-RS) to a first UE, and allocating resources for transmitting at least one CLI-RS to a second UE; receiving a CLI-RS measurement report from the first UE; determining a first beam for downlink reception of the first UE and a second beam for uplink transmission of the second UE based on the CLI-RS measurement report; providing coordinated scheduling information of the first UE and the second UE to the first UE and the second UE based on information about the determined first beam and second beam; and transmitting a downlink signal to the first UE and receiving an uplink signal from the second UE based on the coordinated scheduling information.

[0216] According to an embodiment, the CLI-RS measurement report may include at least one of a complete CLI report, a minimum CLI report, a CLI average report, a threshold-based CLI report, or a blacklist report.

[0217] According to an embodiment, the coordinated scheduling information may be used to transmit and receive signals to and from the first UE or the second UE in a half-duplex (HD) manner, and may be provided to the first UE or the second UE via higher layer signaling.

[0218] According to various embodiments of the present disclosure, a UE supporting a full-duplex (FD) system in a wireless communication system may include at least one transceiver and at least one processor functionally connected to the at least one transceiver, wherein the at least one processor is configured to: receive an allocation of resources for receiving at least one cross-linked interference reference signal (CLI-RS) from a base station; determine at least one CLI-RS receiving beam from multiple available beams based on the allocated resources; receive the CLI-RS from at least one other terminal based on the at least one CLI-RS receiving beam; measure interference with at least one other terminal based on the received CLI-RS; transmit measurement information generated based on the measurement result to the base station; receive coordinated scheduling information from the base station according to the downlink receiving beam determined based on the measurement information; and receive a downlink signal from the base station via the downlink receiving beam determined based on the coordinated scheduling information.

[0219] According to an embodiment, at least one processor may also be configured to determine whether resources for multiple CLI-RS receive beams have been allocated based on the allocated resources, and when resources for multiple CLI-RS receive beams have been allocated, determine multiple CLI-RS receive beams based on these resources.

[0220] According to an embodiment, the at least one processor may be further configured to perform beam scanning to receive the CLI-RS based on the determined plurality of CLI-RS reception beams.

[0221] According to an embodiment, in order to perform beam scanning to receive CLI-RS, at least one processor may also be configured to: receive CLI-RS transmit beam information from at least one other UE, identify multiple CLI-RS receive beams based on the received transmit beam information, transmit information about the identified CLI-RS receive beam to at least one other UE, and receive CLI-RS via the CLI-RS transmit beam information and the identified multiple CLI-RS receive beams.

[0222] According to an embodiment, in order to determine at least one CLI-RS receive beam among multiple available beams based on the allocated resources, at least one processor may also be configured to: based on the allocated resources, when a predetermined CLI-RS beam can be identified, determine the indicated CLI-RS beam as the CLI-RS receive beam, and based on the allocated resources, when no predetermined CLI-RS beam can be identified, determine the CLI-RS receive beam based on the allocated resources and a specific criterion.

[0223] According to an embodiment, in order to determine the indicated CLI-RS beam as a CLI-RS reception beam, at least one processor may be configured to: receive information about a coordination beam mapped to allocated resources; and determine the CLI-RS reception beam based on the received information about the coordination beam, wherein the coordination beam includes at least one of a physical uplink shared channel (PUSCH) beam, a physical downlink shared channel (PDSCH) beam, a beam used when a synchronization signal block (SSB) is received, or a beam used when a channel state information reference signal (CSI-RS) is received, and the coordination beam corresponds to the location of the allocated resources.

[0224] According to an embodiment, in order to determine a CLI-RS reception beam based on allocated resources and a specific criterion, at least one processor may be configured to determine a CLI-RS reception beam based on a PDSCH beam or a PUSCH beam associated with a location of allocated resources.

[0225] According to various embodiments of the present disclosure, a base station supporting a full-duplex (FD) system in a wireless communication system may include at least one transceiver and at least one processor functionally connected to the at least one transceiver, wherein the at least one processor is configured to: allocate resources for receiving at least one cross-linked interference reference signal (CLI-RS) to a first UE, and allocate resources for transmitting at least one CLI-RS to a second UE; receive a CLI-RS measurement report from the first UE; determine a first beam for downlink reception of the first UE and a second beam for uplink transmission of the second UE based on the CLI-RS measurement report; provide coordinated scheduling information of the first UE and the second UE to the first UE and the second UE based on information about the determined first beam and second beam; and transmit a downlink signal to the first UE and receive an uplink signal from the second UE based on the coordinated scheduling information.

[0226] According to an embodiment, the CLI-RS measurement report may include at least one of a complete CLI report, a minimum CLI report, a CLI average report, a threshold-based CLI report, or a blacklist report.

[0227] According to an embodiment, the coordinated scheduling information may be used to transmit and receive signals to and from the first UE or the second UE in a half-duplex (HD) manner, and may be provided to the first UE or the second UE via higher layer signaling.

[0228] The methods disclosed in the claims and / or the methods according to the embodiments described in the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0229] When the method is implemented by software, a computer-readable storage medium for storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. At least one program includes instructions that cause the electronic device to perform the method according to various embodiments of the present disclosure as defined by the attached claims and / or disclosed herein.

[0230] These programs (software modules or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage device, compact disc-ROM (CD-ROM), digital versatile disc (DVD) or other types of optical storage devices, or stored in magnetic tape cassettes. Alternatively, any combination of some or all of them can form a memory in which the program is stored. In addition, multiple such memories can be included in the electronic device.

[0231] In addition, the program can be stored in an attachable storage device that can access the electronic device through a communication network such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), and a storage area network (SAN), or a combination thereof. Such a storage device can access the electronic device via an external port. In addition, a separate storage device on a communication network can access the portable electronic device.

[0232] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiments presented. However, for ease of description, the singular form or plural form is appropriately selected for the presented situation, and the present disclosure is not limited to elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0233] Although specific embodiments have been described in the detailed description of the present disclosure, various modifications and changes may be made thereto without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be defined as being limited to the embodiments set forth herein, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a terminal supporting a full-duplex FD system in a wireless communication system, the method comprising: receiving, from a base station, an allocation of resources for receiving at least one cross-linked interference reference signal CLI-RS; Based on the allocated resources, determine at least one CLI-RS reception beam from among the plurality of available beams; receiving a CLI-RS from at least one other terminal based on the at least one CLI-RS receive beam; Based on the received CLI-RS, measuring interference with the at least one other terminal; transmitting measurement information generated based on the measurement result to the base station; receiving coordinated scheduling information from the base station according to the downlink receive beam determined based on the measurement information; as well as A downlink signal is received from the base station via a downlink reception beam determined based on the coordinated scheduling information.

2. The method of claim 1, further comprising: Based on the allocated resources, determining whether resources for a plurality of CLI-RS receive beams have been allocated, and In a case where the resources for the plurality of CLI-RS reception beams have been allocated, the plurality of CLI-RS reception beams are determined based on the resources.

3. The method of claim 2, further comprising: Based on the determined plurality of CLI-RS reception beams, beam scanning is performed to receive the CLI-RS.

4. The method of claim 3, wherein: The performing beam scanning to receive the CLI-RS further comprises: receiving CLI-RS transmit beam information from the at least one other terminal; identifying the plurality of CLI-RS receive beams based on the received transmit beam information; transmitting information related to the identified CLI-RS receive beam to the at least one other terminal; and The CLI-RS is received via the CLI-RS transmit beam information and the identified plurality of CLI-RS receive beams.

5. The method of claim 1, wherein: Determining, based on the allocated resources, the at least one CLI-RS receive beam among the multiple available beams further comprises: Based on the allocated resources, in case a predetermined CLI-RS beam can be identified, determining the indicated CLI-RS beam as the CLI-RS reception beam; and Based on the allocated resources, in the event that any predetermined CLI-RS beam cannot be identified, the CLI-RS reception beam is determined based on the allocated resources and a specific criterion.

6. The method of claim 5, wherein: Determining the indicated CLI-RS beam as the CLI-RS receive beam includes: receiving information about coordinated beams mapped to the allocated resources; and determining the CLI-RS receive beam based on the received information related to the coordinated beam, The coordinated beam includes at least one of a physical downlink shared channel PDSCH beam corresponding to the location of the allocated resources, a physical uplink shared channel PUSCH beam, a beam used when a synchronization signal block SSB is received, or a beam used when a channel state information reference signal CSI-RS is received.

7. The method of claim 5, wherein: Determining the CLI-RS reception beam based on the allocated resources and a specific criterion includes determining the CLI-RS reception beam based on a PDSCH beam or a PUSCH beam associated with a location of the allocated resources.

8. A method performed by a base station supporting a full-duplex FD system in a wireless communication system, the method comprising: Allocate resources for receiving at least one cross-linked interference reference signal CLI-RS to the first terminal, and allocate resources for transmitting at least one CLI-RS to the second terminal; receiving a CLI-RS measurement report from the first terminal; Determine, based on the CLI-RS measurement report, a first beam for downlink reception of the first terminal and a second beam for uplink transmission of the second terminal; Based on the determined information about the first beam and the second beam, providing the first terminal and the second terminal with coordinated scheduling information for the first terminal and the second terminal; as well as Based on the coordinated scheduling information, a downlink signal is transmitted to the first terminal and an uplink signal is received from the second terminal.

9. The method of claim 8, wherein: The CLI-RS measurement report includes at least one of a complete CLI report, a minimum CLI report, a CLI average report, a threshold-based CLI report, or a blacklist report.

10. The method of claim 8, wherein: The coordinated scheduling information is used to transmit a signal to the first terminal or the second terminal and receive a signal from the first terminal or the second terminal in a half-duplex HD mode, and is provided to the first terminal or the second terminal via high-layer signaling.

11. A terminal supporting a full-duplex FD system in a wireless communication system, the terminal comprising: at least one transceiver; as well as at least one processor functionally coupled to the at least one transceiver wherein the at least one processor is configured to: receiving, from a base station, an allocation of resources for receiving at least one cross-linked interference reference signal CLI-RS; Based on the allocated resources, determine at least one CLI-RS reception beam from among the plurality of available beams; receiving a CLI-RS from at least one other terminal based on the at least one CLI-RS receive beam; Based on the received CLI-RS, measuring interference with the at least one other terminal; transmitting measurement information generated based on the measurement result to the base station; receiving coordinated scheduling information from the base station according to the downlink receive beam determined based on the measurement information; as well as A downlink signal is received from the base station via a downlink reception beam determined based on the coordinated scheduling information.

12. The terminal according to claim 11, wherein: The at least one processor is further configured to: Based on the allocated resources, determining whether resources for a plurality of CLI-RS receive beams have been allocated, and In a case where the resources for the plurality of CLI-RS reception beams have been allocated, the plurality of CLI-RS reception beams are determined based on the resources.

13. The terminal according to claim 12, wherein: The at least one processor is further configured to perform beam scanning to receive the CLI-RS based on the determined plurality of CLI-RS reception beams.

14. The terminal according to claim 13, wherein: To perform the beam scanning to receive the CLI-RS, the at least one processor is further configured to: receiving CLI-RS transmit beam information from the at least one other terminal; identifying the plurality of CLI-RS receive beams based on the received transmit beam information; transmitting information related to the identified CLI-RS receive beam to the at least one other terminal; as well as The CLI-RS is received via the CLI-RS transmit beam information and the identified plurality of CLI-RS receive beams.

15. The terminal according to claim 11, wherein: To determine, based on the allocated resources, the at least one CLI-RS reception beam among the plurality of available beams, the at least one processor is further configured to: Based on the allocated resources, if a predetermined CLI-RS beam can be identified, determining the indicated CLI-RS beam as the CLI-RS receive beam; as well as Based on the allocated resources, in the event that any predetermined CLI-RS beam cannot be identified, the CLI-RS reception beam is determined based on the allocated resources and a specific criterion.

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