Apparatus and method for performing full duplex-based communication in unlicensed band in wireless communication system

Abstract

The purpose of the present disclosure is to perform full duplex-based communication in an unlicensed band in a wireless communication system. This operation method of a base station may comprise the steps of: transmitting system information including information related to a communication band; transmitting configuration information related to the division of the uplink resource and the downlink resource in the communication band; performing a first channel access procedure (CAP) for a first channel and a second channel included in the communication band based on the system information and / or the configuration information; transmitting a signal on the first channel based on success of the first CAP on the first channel; and performing a second CAP on the second channel while transmitting the signal on the first channel.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to an apparatus and method for performing full-duplex based communication in an unlicensed frequency band in a wireless communication system. Background Art

[0002] Wireless communication systems have been widely deployed to provide various types of communication services, such as voice or data. Generally speaking, wireless communication systems are multiple access systems that support communication for multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, and single carrier frequency division multiple access (SC-FDMA) systems.

[0003] In particular, since a large number of communication devices require a large communication capacity, an enhanced mobile broadband (eMBB) communication technology is being proposed compared to a conventional radio access technology (RAT). In addition, not only a large-scale machine type communication (massive MTC) that provides various services anytime and anywhere by connecting multiple devices and objects is being proposed, but also a communication system that takes into account services / user terminal devices (UEs) that are sensitive to reliability and latency is being proposed. Various technical configurations are proposed for this purpose. Summary of the invention

[0004] Technical issues

[0005] The present disclosure may provide an apparatus and method for efficiently performing full-duplex (FD) based communication in an unlicensed frequency band in a wireless communication system.

[0006] The present disclosure may provide an apparatus and method for performing a channel access procedure (CAP) operation in another channel during a transmission operation in any channel in an unlicensed frequency band in a wireless communication system.

[0007] The present disclosure may provide an apparatus and method for configuring a subband or bandwidth part (BWP) for FD-based communication in a wireless communication system.

[0008] The present disclosure may provide an apparatus and method for configuring a subband or BWP for FD-based communication by considering performing CAP in an unlicensed band in a wireless communication system.

[0009] The present disclosure may provide an apparatus and method for configuring a subband or BWP for FD-based communication in a channel unit of an unlicensed frequency band in a wireless communication system.

[0010] The present disclosure may provide an apparatus and method for determining a communication direction based on a CAP result in an unlicensed frequency band in a wireless communication system.

[0011] The present disclosure may provide an apparatus and method for adaptively adjusting an energy detection (ED) threshold for a CAP in an unlicensed band in a wireless communication system.

[0012] The present disclosure may provide an apparatus and method for differently determining an ED threshold for a CAP in an unlicensed band according to whether an FD operation is operated in a wireless communication system.

[0013] The present disclosure may provide an apparatus and method for defining an operation of each CAP type in an unlicensed band by considering an FD operation in a wireless communication system.

[0014] The present disclosure may provide an apparatus and method for determining a channel occupation time (COT) by considering a CAP success time of each channel for a multi-channel CAP setting in a wireless communication system.

[0015] The technical objectives to be achieved by the present disclosure are not limited to the contents mentioned above, and those skilled in the art to which the technical configuration of the present disclosure is applied can consider other technical objectives not mentioned therein from the embodiments of the present disclosure to be described below.

[0016] Technical Solution

[0017] As an example of the present disclosure, a method for operating a base station in a wireless communication system may include: sending system information including information related to a communication frequency band; sending configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; based on at least one of the system information or the configuration information, performing a first channel access procedure (CAP) for a first channel and a second channel included in the communication frequency band; based on the success of the first CAP in the first channel, sending a signal in the first channel; and performing a second CAP for the second channel during the transmission of the signal in the first channel. The configuration information may include information related to a first threshold of energy detection (ED) for the first CAP and a second threshold of ED for the second CAP.

[0018] As an example of the present disclosure, a base station in wireless communication may include a transceiver and a processor connected to the transceiver, and the processor may be configured to: send system information including information related to a communication frequency band; send configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; based on at least one of the system information or the configuration information, perform a first channel access procedure (CAP) for a first channel and a second channel included in the communication frequency band; based on the success of the first CAP in the first channel, send a signal in the first channel; and perform a second CAP for the second channel during the transmission of the signal in the first channel. The configuration information may include information related to a first threshold of energy detection (ED) for the first CAP and a second threshold of ED for the second CAP.

[0019] As an example of the present disclosure, a communication device may include at least one processor and at least one computer memory connected to the at least one processor and storing instructions, the instructions indicating operations when executed by the at least one processor, and the operations may include: sending system information including information related to a communication frequency band; sending configuration information related to distinguishing uplink resources and downlink resources in the communication frequency band; based on at least one of the system information or the configuration information, performing a first channel access procedure (CAP) for a first channel and a second channel included in the communication frequency band; based on the success of the first CAP in the first channel, sending a signal in the first channel; and performing a second CAP for the second channel during the transmission of the signal in the first channel. The configuration information may include information related to a first threshold of energy detection (ED) for the first CAP and a second threshold of ED for the second CAP.

[0020] As an example of the present disclosure, a non-transitory computer-readable medium storing at least one instruction may include at least one instruction executable by a processor, and the at least one instruction may control a device to: send system information including information related to a communication frequency band; send configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; based on at least one of the system information or the configuration information, perform a first channel access procedure (CAP) for a first channel and a second channel included in the communication frequency band; based on the success of the first CAP in the first channel, send a signal in the first channel; and perform a second CAP for the second channel during the transmission of the signal in the first channel. The configuration information may include information related to a first threshold of energy detection (ED) for the first CAP and a second threshold of ED for the second CAP.

[0021] The above-mentioned aspects of the present disclosure are only a part of exemplary embodiments of the present disclosure, and those skilled in the art can derive and understand various embodiments reflecting the technical features of the present disclosure based on the following detailed description of the present disclosure.

[0022] Beneficial Effects

[0023] As is apparent from the above description, the embodiments of the present disclosure have the following effects.

[0024] According to the present disclosure, full-duplex-based communication can be efficiently performed in a license-exempt band.

[0025] Those skilled in the art will appreciate that the effects that can be achieved by the embodiments of the present disclosure are not limited to the above effects, and other beneficial effects of the present disclosure will be more clearly understood from the following detailed description. That is, those skilled in the art can derive unexpected effects according to the embodiments of the present disclosure from the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are provided to help understand the present disclosure, and the embodiments of the present disclosure may be provided together with the detailed description. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. The reference numerals in each drawing may refer to structural elements.

[0027] Figure 1 An example of a structure of a wireless communication system to which the present disclosure can be applied is illustrated.

[0028] Figure 2 An example of a wireless device applicable to the present disclosure is illustrated.

[0029] Figure 3 The frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0030] Figure 4 An example of a resource grid in a wireless communication system to which the present disclosure can be applied is illustrated.

[0031] Figure 5 An example of a physical resource block in a wireless communication system to which the present disclosure can be applied is illustrated.

[0032] Figure 6 An example of a time slot structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0033] Figure 7 An example of a physical channel used in a wireless communication system to which the present disclosure can be applied and an example of a general signal transmission and reception method using the physical channel are illustrated.

[0034] Figure 8a and Figure 8b An example of a wireless communication system supporting a license-free band to which the present disclosure is applicable is illustrated.

[0035] Fig. 9 A flow chart illustrating a channel access procedure (CAP) operation for a base station to perform downlink signal transmission through an unlicensed frequency band.

[0036] Fig.10 A flow chart illustrating a Type 1 CAP operation in which a terminal performs uplink signal transmission.

[0037] Fig.11 An example of a single resource element group (REG) structure is illustrated.

[0038] Fig.12 An example of a non-interleaved CCE-REG mapping type is illustrated.

[0039] Fig.13 An example of an interleaved CCE-REG mapping type is illustrated.

[0040] Fig.14 An example of a block interleaver is illustrated.

[0041] Fig.15 An example of a network initial access and communication procedure to which the present disclosure is applicable is illustrated.

[0042] Fig.16 An example of full-duplex communication between carriers to which the present disclosure is applicable is illustrated.

[0043] Fig.17a and Fig.17b An example of coexistence of a time resource having a half-duplex (HD) operation and a time resource having a FD operation, to which the present disclosure is applicable, is illustrated.

[0044] Fig.18 An example of CAP operation for communication in a license-exempt band to which the present disclosure is applicable is illustrated.

[0045] Fig.19 Another example of CAP operation for communication in a license-exempt band to which the present disclosure is applicable is illustrated.

[0046] Fig. 20 An example of a process of applying an FD operation to an unlicensed band in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0047] Fig.21 An example of a process of transmitting a signal by using a license-exempt band in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0048] Fig. 22 An example of a process of determining a link direction of a channel in an unlicensed band in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0049] Fig.23 An example of a process of adaptively applying an ED threshold in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0050] Fig.24 An example of a process of determining availability of a channel in a license-exempt band in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0051] Fig.24 An example of adjusting a backoff counter value for a CAP in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0052] Fig.25 An example of a process of transmitting a signal according to CAP success in a part of an allocated channel in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0053] Fig.26 An example of another process of transmitting a signal according to CAP success in a portion of an allocated channel in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0054] Fig. 27 An example of a process of transmitting a signal according to a channel occupancy time in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0055] Fig.28 An example of another process of transmitting a signal according to a channel occupancy time in a wireless communication system according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0056] The embodiments of the present disclosure described below are combinations of elements and features of the present disclosure in a particular form. Unless otherwise mentioned, elements or features may be considered to be selective. Each element or feature may be put into practice without being combined with other elements or features. In addition, embodiments of the present disclosure may be constructed by combining some elements and / or features. The order of operations described in the embodiments of the present disclosure may be rearranged. Some structures or elements of any one embodiment may be included in another embodiment and may be replaced by the corresponding structures or features of another embodiment.

[0057] In the description of the drawings, processes or steps that render the scope of the present disclosure unnecessarily ambiguous will be omitted, and processes or steps that can be understood by those skilled in the art will be omitted.

[0058] Throughout the specification, when a part "includes" or "comprises" a component, this indicates that other components are not excluded and may further be included, unless otherwise specified. The terms "unit", "-or / er" and "module" described in this specification indicate a unit for processing at least one function or operation, which can be implemented by hardware, software or a combination thereof. In addition, "a" or "an", "one", "the", etc. in the context of the present disclosure (more specifically, in the context of the appended claims) may include singular and plural expressions, unless otherwise specified in the specification or unless the context clearly indicates otherwise.

[0059] In the embodiments of the present disclosure, the data transmission and reception relationship between the base station (BS) and the mobile station is mainly described. The BS refers to the terminal node of the network, which directly communicates with the mobile station. The specific operation described as being performed by the BS can be performed by the upper node of the BS.

[0060] That is, it is apparent that in a network composed of a plurality of network nodes including a BS, various operations performed for communication with a mobile station may be performed by the BS or network nodes other than the BS. The term "BS" may be replaced with a fixed station, a Node B, an evolved Node B (eNode B or eNB), an advanced base station (ABS), an access point, etc.

[0061] In an embodiment of the present disclosure, the term terminal may be replaced with UE, mobile station (MS), subscriber station (SS), mobile subscriber station (MSS), mobile terminal, advanced mobile station (AMS), etc.

[0062] The transmitter is a fixed and / or mobile node that provides data services or voice services, and the receiver is a fixed and / or mobile node that receives data services or voice services. Therefore, on the uplink (UL), the mobile station can act as a transmitter and the BS can act as a receiver. Similarly, on the downlink (DL), the mobile station can act as a receiver and the BS can act as a transmitter.

[0063] The embodiments of the present disclosure may be supported by at least one of the standard specifications disclosed for wireless access systems including the Institute of Electrical and Electronics Engineers (IEEE) 802.xx system, the 3rd Generation Partnership Project (3GPP) system, the 3GPP Long Term Evolution (LTE) system, the 3GPP Fifth Generation (5G) New Radio (NR) system, and the 3GPP2 system. Specifically, the embodiments of the present disclosure may be supported by the standard specifications 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS36.321, and 3GPP TS 36.331.

[0064] In addition, the embodiments of the present disclosure are applicable to other radio access systems and are not limited to the above-mentioned systems. For example, the embodiments of the present disclosure are applicable to systems applied after the 3GPP 5G NR system and are not limited to a specific system.

[0065] That is, steps or parts that are not described to clarify the technical features of the present disclosure may be supported by those documents. In addition, all terms as proposed herein may be interpreted by standard documents.

[0066] Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The detailed description given below with reference to the accompanying drawings is intended to explain exemplary embodiments of the present disclosure, rather than to show the only embodiments that can be implemented according to the present disclosure.

[0067] The following detailed description includes specific terms in order to provide a thorough understanding of the present disclosure. However, it is obvious to those skilled in the art that other terms may be used to replace specific terms without departing from the technical spirit and scope of the present disclosure.

[0068] The embodiments of the present disclosure can be applied to various radio access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc.

[0069] Hereinafter, in order to clarify the following description, the description is based on the 3GPP communication system (e.g., LTE, NR, etc.), but the technical spirit of the present disclosure is not limited thereto. LTE may refer to the technology after 3GPP TS 36.xxx version 8. Specifically, the LTE technology after 3GPP TS 36.xxx version 10 may be referred to as LTE-A, and the LTE technology after 3GPP TS 36.xxx version 13 may be referred to as pre-LTE-A. 3GPP NR may refer to the technology after TS 38.xxx version 15. 3GPP 6G may refer to the technology after TS version 17 and / or version 18. "xxx" may refer to the detailed number of the standard document. LTE / NR / 6G may be collectively referred to as the 3GPP system.

[0070] 3GPP 6G may refer to post-3GPP NR technology based on the 3GPP system. 3GPP 6G may not be limited to a version or a specific TS document, and its name may have a different form from 3GPP 6G. That is, 3GPP 6G may refer to a technology introduced after 3GPP NR, and is not limited to a specific form.

[0071] The following description will mainly focus on the 3GPP NR system, but is not limited thereto, and can be applied to 3GPP 6G. In addition, the content described below may be partially modified to be used in consideration of the 3GPP 6G system, and is not limited to a specific form. However, in the following, for ease of explanation, the 3GPP NR system will be mainly described. For the background technology, terms, abbreviations, etc. used in this disclosure, please refer to the matters described in the standard documents published before this disclosure. For example, standard documents 36.xxx and 38.xxx may be referenced.

[0072] Overall system

[0073] As more and more communication devices require greater communication capacity, the demand for mobile broadband communications that are more enhanced than existing radio access technologies (RATs) is rising. In addition, large-scale machine type communications (MTC) that provide various services anytime and anywhere by connecting multiple devices and things is also one of the main issues worth considering in next-generation communications. In addition, the design of communication systems that consider services / terminals that are sensitive to reliability and latency is also under discussion. Therefore, the introduction of next-generation RATs that consider enhanced mobile broadband communications (eMBB), massive MTC (mMTC), ultra-reliable low-latency communications (URLLC), etc. is under discussion, and for convenience, the corresponding technology is referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0074] The new RAT system including NR uses an OFDM transmission method or a similar transmission method. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the parameter set of the existing LTE / LTE-A as is, but support a wider system bandwidth (e.g., 100MHz). Alternatively, a cell may support multiple parameter sets. In other words, terminals operating according to different parameter sets may coexist in one cell.

[0075] A parameter set corresponds to one subcarrier spacing in the frequency domain. Because the reference subcarrier spacing is scaled by an integer N, different parameter sets can be defined.

[0076] In addition, new RAT systems including 6G may be considered as next generation RATs. New RAT systems including 6G may consider i) very high data speeds per device, ii) a large number of connected devices, iii) global connectivity, iv) very low latency, v) reduced energy consumption of battery-free IoT devices, vi) ultra-high reliability connectivity, and vii) connectivity intelligence with machine learning capabilities, but are not limited thereto. In view of the above, new RAT systems including 6G may consider using the terahertz (THz) band, i.e., a frequency higher than the NR system, for wider bandwidth and higher transmission speeds. RAT systems including 6G may overcome existing limitations by applying artificial intelligence / machine learning (AI / ML), but may not be limited thereto.

[0077] Figure 1 The structure of a wireless communication system to which the present disclosure can be applied is illustrated. Figure 1 , NG-RAN consists of gNBs that provide control plane (RRC) protocol terminations for the NG-Radio Access (NG-RA) user plane (i.e., new access stratum (AS) sublayer / packet data convergence protocol (PDCP) / radio link control (RLC) / MAC / PHY) and UE. The gNBs are interconnected through the Xn interface. In addition, the gNBs are connected to the new generation core (NGC) through the N2 interface. More specifically, the gNB is connected to the access and mobility management function (AMF) through the N2 interface and to the user plane function (UPF) through the N3 interface. Figure 1 It can be based on the structure of the NR system. Figure 1 The structure can be used in the 6G system as it is or by being partially modified, and is not limited to a specific form.

[0078] Figure 2 An example of a wireless device applicable to the present disclosure is illustrated.

[0079] Reference Figure 2The wireless device 200 may send / receive radio signals via various wireless access technologies (e.g., LTE, LTE-A, pre-LTE-A, NR, 5G, 5G-A, 6G). The wireless device 200 may include at least one processor 202 and at least one memory 204, and may further include at least one transceiver 206 and / or at least one antenna 208.

[0080] The processor 202 may be configured to control the memory 204 and / or the transceiver 206 and implement the description, function, process, proposal, method and / or operation flow chart disclosed in this document. For example, the processor 202 may generate a first information / signal by processing the information in the memory 204, and then send a radio signal including the first information / signal through the transceiver 206. In addition, the processor 202 may receive a radio signal including a second information / signal through the transceiver 206, and then store information obtained from the signal processing of the second information / signal in the memory 204. The memory 204 may be connected to the processor 202 and store various information associated with the operation of the processor 202. For example, the memory 204 may store software code including instructions for implementing part or all of the processes controlled by the processor 202 or for implementing the description, function, process, proposal, method and / or operation flow chart disclosed in this document. Here, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement wireless communication technology. The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through at least one antenna 208. The transceiver 206 may be a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may refer to a communication modem / circuit / chip.

[0081] Hereinafter, the hardware elements of the wireless device 200 will be described in further detail. Although not limited thereto, at least one processor 202 may implement at least one protocol layer (e.g., functional layers such as physical (PHY), medium access control (MAC), radio link control (RLC), packet data convergence protocol (PDCP), radio resource control (RRC), and service data adaptation protocol (SDAP)). At least one processor 202 may generate at least one protocol data unit (PDU) and / or at least one service data unit (SDU) according to the description, function, process, proposal, method, and / or operation flow chart disclosed in this document. At least one processor 202 may generate a message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow chart disclosed in this document. At least one processor 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the function, process, proposal, and / or method disclosed in this document, and provide the signal to at least one transceiver 206. At least one processor 202 can receive a signal (e.g., a baseband signal) from at least one transceiver 206 and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document.

[0082] At least one processor 202 may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. At least one processor 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, at least one application specific integrated circuit (ASIC), at least one digital signal processor (DSP), at least one digital signal processing device (DSPD), at least one programmable logic device (PLD), or at least one field programmable gate array (FPGA) may be included in at least one processor 202. The description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, processes, or functions. Firmware or software configured to execute the description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be included in at least one processor 202, or may be stored in at least one memory 204 and executed by at least one processor 202. The description, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, instructions, and / or instruction sets.

[0083] At least one memory 204 may be connected to at least one processor 202 and store various forms of data, signals, messages, information, programs, codes, instructions, and / or instructions. At least one memory 204 may be configured as a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), a flash memory, a hard disk, a register, a cache memory, a computer-readable storage medium, and / or a combination thereof. At least one memory 204 may be located inside and / or outside of at least one processor 202. In addition, at least one memory 204 may be connected to at least one processor 202 via various technologies such as a wired or wireless connection.

[0084] At least one transceiver 206 can send user data, control information, and wireless signals / channels mentioned in the method and / or operation flow chart of this document to at least one other device. At least one transceiver 206 can receive user data, control information, and wireless signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow chart disclosed in this document from at least one other device. For example, at least one transceiver 206 can be connected to at least one processor 202 and send and receive radio signals. For example, at least one processor 202 can control at least one transceiver 206 to send user data, control information, or radio signals to at least one other device. In addition, at least one processor 202 can control at least one transceiver 206 to receive user data, control information, or radio signals from at least one other device. In addition, at least one transceiver 206 can be connected to at least one antenna 208, and at least one transceiver 206 can be configured to send and receive user data, control information, and radio signals / channels mentioned in the description, function, process, proposal, method, and / or operation flow chart disclosed in this document through at least one antenna 208. In this document, at least one antenna may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). At least one transceiver 206 may convert received radio signals / channels from RF band signals to baseband signals in order to facilitate processing of received user data, control information, and radio signals / channels using at least one processor 202. At least one transceiver 206 may convert user data, control information, and radio signals / channels processed using at least one processor 202 from baseband signals to RF band signals. To this end, at least one transceiver 206 may include an (analog) oscillator and / or a filter.

[0085] Reference Figure 2The components of the described wireless device may be referred to by other terms from the functional aspect. For example, the processor 202 may be referred to as a control unit, the transceiver 206 may be referred to as a communication unit, and the memory 204 may be referred to as a storage unit. In some cases, the communication unit may be used to mean at least a part of the processor 202 and the transceiver 206.

[0086] Reference Figure 2 The structure of the wireless device described may be understood as the structure of at least a portion of various devices. As an example, the structure may be at least a portion of various devices (e.g., a robot, a vehicle, an XR device, a handheld device, a home appliance, an IoT device, an AI device / server, etc.). In addition, according to various embodiments, in addition to Figure 2 In addition to the components illustrated in the figure, the device may further include other components.

[0087] For example, the device may be a handheld device such as a smart phone, a smart tablet, a wearable device (e.g., a smart watch, smart glasses), and a handheld computer (e.g., a laptop computer, etc.). In this case, the device may further include at least one of: a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; an interface unit that includes at least one port for connecting to another device (e.g., an audio input / output port, a video input / output port); and an input / output unit for inputting and outputting video information / signals, audio information / signals, data, and / or information input from a user.

[0088] For example, the device may be a mobile device such as a mobile robot, a vehicle, a train, a manned / unmanned aerial vehicle (AV), and a ship. In this case, the device may further include at least one of the following: a drive unit including at least one of an engine, a motor, a power train, wheels, brakes, and a steering device of the device; a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; an automatic driving unit that performs functions such as route maintenance, speed control, and destination setting; and a position measurement unit that obtains mobile object position information through a global positioning system (GPS) and various sensors.

[0089] For example, the device may be an XR device such as an HMD, a head-up display (HUD) provided in a vehicle, a TV, a smartphone, a wearable device, a home appliance device, a digital signage, a vehicle, and a robot. In this case, the device may further include at least one of: a power supply unit that supplies power and includes a wired / wireless charging circuit, a battery, etc.; an input / output unit that obtains control information and data from the outside and outputs a generated XR object; and a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device.

[0090] For example, the device may be a robot, which may be classified according to the purpose or field of use as industrial use, medical use, home use, military use, etc. In this case, the device may further include at least one of: a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; and a drive unit that moves robot joints and performs various other physical operations.

[0091] For example, the device may be an AI device such as a TV, a projector, a smartphone, a PC, a laptop, a digital broadcast terminal, a tablet, a wearable device, a set-top box (STB), a radio, a washing machine, a refrigerator, a digital signage, a robot, and a vehicle. In this case, the device may further include at least one of: an input unit that obtains various types of data from the outside; an output unit that generates an output associated with vision, hearing, or touch; a sensor unit that senses state information, environmental information, and user information of the device or the surroundings of the device; and a training unit that uses learning data to learn a model composed of an artificial neural network. Figure 2 The structure of the wireless device illustrated in the example can be understood as a part of a RAN node (eg, a base station, a DU, a RU, a RRH, etc.). That is, Figure 2 The device illustrated in the example may be a RAN node. In this case, the device may further include a wired transceiver for fronthaul and / or backhaul communication. However, in the case where the fronthaul and / or backhaul communication is based on wireless communication, Figure 2 The at least one transceiver 206 illustrated in FIG. 2 may be used for fronthaul and / or backhaul communications and may not include a wired transceiver.

[0092] Figure 3 The frame structure in a wireless communication system to which the present disclosure can be applied is illustrated.

[0093] The NR system may support multiple parameter sets. Here, the parameter set may be defined by a subcarrier spacing and a cyclic prefix (CP) overhead. Here, multiple subcarrier spacings may be derived by scaling the default (reference) subcarrier spacing by an integer N (or μ). In addition, although it is assumed that very low subcarrier spacing is not used in very high carrier frequencies, the parameter set used herein may be selected independently of the frequency band. In addition, various frame structures according to multiple parameter sets may be supported in the NR system.

[0094] In the following, OFDM parameter sets and frame structures that can be considered in the NR system will be described. The various OFDM parameter sets supported in the NR system can be defined as shown in Table 1 below.

[0095] [Table 1]

[0096] μ <![CDATA[Δf=2 μ ·15[kHz]]]> CP 0 15 normal 1 30 normal 2 60 Normal, Extended 3 120 normal 4 240 normal

[0097] NR supports multiple parameter sets (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15kHz, a wide area of ​​the traditional cellular band is supported, and when the SCS is 30kHz / 60kHz, dense urban areas, lower latency and wider carrier bandwidth are supported, and when the SCS is 60kHz or higher, bandwidths greater than 24.25GHz are supported to overcome phase noise. The NR band is defined as two types of frequency ranges (FR1, FR2). FR1 and FR2 can be configured according to Table 2 below. In addition, FR2 can mean millimeter wave (mmW).

[0098] [Table 2]

[0099] Frequency range specification Corresponding frequency range Subcarrier spacing FR1 410MHz-7125MHz 15, 30, 60kHz FR2 24250MHz-52600MHz 60, 120, 240kHz

[0100] Regarding the frame structure in the NR system, the sizes of various fields in the time domain are expressed in T c =1 / (Δf max ·N f ) is expressed in multiples of the time unit. Here, Δf max 480·10 3 Hz, and N f is 4096. Downlink and uplink transmissions are configured (organized) with T f =1 / (Δf max ·N f / 100)T c =10ms duration radio frame. Here, the radio frames are respectively configured with T sf =(Δf max ·Nf / 1000)T c=10 subframes of duration of 1ms. In this case, there is one set of frames for uplink and one set of subframes for downlink. In addition, the transmission in uplink frame number i from the terminal should start T earlier than the corresponding downlink frame in the corresponding terminal. TA =(N TA +N TA,offset )T c For the subcarrier spacing configuration μ, the time slots in the subframe are The time slots in a radio frame are numbered in ascending order of A time slot is configured with A continuous OFDM symbol configuration is determined based on the CP Time slot in subframe The start time is the same as the OFDM symbol in the same subframe It is impossible for all terminals to perform transmission and reception at the same time, which means that not all OFDM symbols of a downlink time slot or an uplink time slot are available.

[0101] Table 3 shows the number of OFDM symbols per time slot in a normal CP Number of time slots per radio frame and the number of time slots per subframe And Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in the extended CP.

[0102] [Table 3]

[0103]

[0104] [Table 4]

[0105]

[0106] Figure 3 This is an example about μ=2 (SCS is 60 kHz), and referring to Table 3, 1 subframe may include 4 slots. Figure 3 1 subframe = {1, 2, 4} slots shown in is an example, and the number of slots that may be included in 1 subframe is as defined in Table 3 or Table 4. In addition, a mini-slot may include 2, 4, or 7 symbols or more or less.

[0107] Regarding the physical resources in the NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc. can be considered. Hereinafter, the physical resources that can be considered in the NR system will be described in detail.

[0108] First, with respect to antenna ports, the antenna ports are defined so that the channel carrying the symbol in the antenna port can be inferred from the channel carrying another symbol in the same antenna port. When the large-scale characteristics of the channel carrying the symbol in one antenna port can be inferred from the channel carrying the symbol in another antenna port, the two antenna ports can be said to be in a quasi-co-location or quasi-co-location (QC / QCL) relationship. In this case, the large-scale characteristics include one or more of delay spread, Doppler spread, frequency offset, average received power, and receive timing.

[0109] In the 6G system, communication can be performed at the above-mentioned THz frequency band higher than the millimeter wave (mmW) frequency, and the same Figure 3 The same frame structure as shown, or a separate frame structure for the 6G system may be used, but is not limited to a specific form.

[0110] Figure 4 A resource grid in a wireless communication system to which the present disclosure can be applied is illustrated.

[0111] Reference Figure 4 , as an illustrative description, the resource grid is configured in the frequency domain with subcarriers, and one subframe is configured with 14·2 μ OFDM symbols, but the resource grid and subframe are not limited to this. In the NR system, the transmitted signal consists of OFDM symbols and One or more resource grids for each subcarrier. Here, represents the maximum transmission bandwidth, which may differ between uplink and downlink and between parameter sets. In this case, one resource grid can be configured for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is called a resource element and is uniquely identified by an index pair (k, l'). Here, is an index in the frequency domain, and l'=0,..., refers to the position of a symbol in a subframe. When referring to a resource element in a slot, an index pair (k, l) is used. Here, The resource element (k, l') for μ and antenna port p corresponds to the complex value When there is no risk of confusion or no specific antenna port or parameter set is specified, the indices p and μ can be discarded and the complex value can be or a k，l′ In addition, a resource block (RB) is defined as consecutive subcarriers.

[0112] Point A plays the role of a common reference point for the resource block grid and is obtained as follows.

[0113] -OffsetToPointA for the primary cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block overlapping with the SS / PBCH block used by the terminal for initial cell selection. It is expressed in resource blocks, assuming that the subcarrier spacing for FR1 is 15kHz and the subcarrier spacing for FR2 is 60kHz.

[0114] -absoluteFrequencyPointA represents the frequency location of point A, as expressed in absolute radio frequency channel number (ARFCN).

[0115] For subcarrier spacing configuration μ, the common resource blocks are numbered from 0 upwards in the frequency domain. The center of subcarrier 0 of common resource block 0 for subcarrier spacing configuration μ is the same as "point A". Number of common resource blocks for subcarrier spacing configuration μ in the frequency domain The relationship between and resource element (k, l) is given by the following formula 1.

[0116] [Formula 1]

[0117]

[0118] In equation 1, k is defined relative to point A, so that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks are spaced from 0 to 1 in a bandwidth part (BWP). where i is the number of the BWP. Physical resource block n in BWP i PRB and public resource block n CRB The relationship between is given by the following formula 2.

[0119] [Formula 2]

[0120]

[0121] is the common resource block where the BWP starts relative to common resource block 0.

[0122] Figure 5 The physical resource blocks in the wireless communication system to which the present disclosure can be applied are illustrated. Figure 6 The following illustrates a time slot structure in a wireless communication system to which the present disclosure can be applied.

[0123] Reference Figure 5 and Figure 6 , a slot includes a plurality of symbols in the time domain. For example, for a normal CP, a slot includes 7 symbols, but for an extended CP, a slot includes 6 symbols.

[0124] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as multiple consecutive (physical) resource blocks in the frequency domain and may correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication may be performed through an activated BWP, and only one BWP may be activated for one terminal. In a resource grid, each element is called a resource element (RE) and may map a complex symbol.

[0125] In the NR system, each component carrier (CC) can support up to 400MHz. If the terminal working in such a wideband CC always operates with the radio frequency (FR) chip for the entire CC turned on, the terminal battery consumption may increase. Alternatively, when considering several application scenarios operating in a wideband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different parameter sets (e.g., subcarrier spacing, etc.) can be supported in each frequency band in the corresponding CC. Alternatively, each terminal may have a different maximum bandwidth capability. In this regard, the base station may instruct the terminal to operate only in part of the bandwidth instead of the total bandwidth of the wideband CC, and for convenience, the corresponding part of the bandwidth is defined as a bandwidth part (BWP). BWP can be configured with continuous RBs on the frequency axis and may correspond to a parameter set (e.g., subcarrier spacing, CP length, slot / microslot duration).

[0126] At the same time, even in one CC configured for the terminal, the base station can configure multiple BWPs. For example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring time slot, and the PDSCH indicated by the PDCCH can be scheduled in a larger BWP. Alternatively, when the UE is congested in a specific BWP, some terminals can be configured with another BWP for load balancing. Alternatively, considering the frequency domain inter-cell interference elimination between adjacent cells, etc., some middle spectrums of the entire bandwidth can be excluded, and BWPs on two edges can be configured in the same time slot. In other words, the base station can configure at least one DL / UL BWP for a terminal associated with a broadband CC. The base station can activate at least one DL / UL BWP in the configured DL / UL BWP at a specific time (through L1 signaling or MAC control unit (CE) or RRC signaling, etc.). In addition, the base station can indicate switching to another configured DL / UL BWP (through L1 signaling or MAC CE or RRC signaling, etc.). Alternatively, based on a timer, when the timer value expires, it can switch to the determined DL / UL BWP. Here, the activated DL / UL BWP is defined as the active DL / UL BWP. However, when the terminal performs the initial access process or has not yet established an RRC connection, the configuration of the DL / UL BWP may not be received, so the DL / UL BWP assumed by the terminal in this case is defined as the initial active DL / UL BWP.

[0127] Figure 7 Physical channels used in a wireless communication system to which the present disclosure can be applied and a general signal transmission and reception method using the physical channels are illustrated.

[0128] In a wireless communication system, a terminal receives information from a base station via a downlink, and a terminal sends information to a base station via an uplink. The information sent and received by the base station and the terminal includes data and various control information, and there are various physical channels according to the type / purpose of the information they send and receive.

[0129] When the terminal is turned on or newly enters a cell, the terminal performs an initial cell search, which includes synchronization with a base station (S701). To this end, the terminal can synchronize with the base station by receiving a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) from the base station, and obtain information such as a cell identifier (ID). Next, the terminal can obtain broadcast information in the cell by receiving a physical broadcast channel (PBCH) from the base station. At the same time, the terminal can check the downlink channel state by receiving a downlink reference signal (DL RS) in the initial cell search step.

[0130] The terminal that has completed the initial cell search can obtain more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to information carried in the PDCCH (S702).

[0131] Meanwhile, if the terminal accesses the base station for the first time or does not have radio resources for signal transmission, the terminal may perform a random access procedure (RACH) on the base station (S703 to S706). To this end, the terminal may send a specific sequence as a preamble through a physical random access channel (PRACH) (S703 and S705), and receive a response message to the preamble through a PDCCH and a corresponding PDSCH (S704 and S706). In the case of a contention-based RACH, a contention resolution process may be additionally performed.

[0132] The terminal that has performed the above process may then perform PDCCH / PDSCH reception (S707) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S708) as a general uplink / downlink signal transmission process. Specifically, the terminal receives downlink control information (DCI) through PDCCH. Here, DCI includes control information such as resource allocation information for the terminal, and has different formats depending on its purpose of use.

[0133] At the same time, the control information sent by the terminal to the base station through the uplink or received by the terminal from the base station includes downlink / uplink confirmation / non-confirmation (ACK / NACK) signal, channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. For the 3GPP LTE system, the terminal can send the above-mentioned CQI / PMI / RI and other control information through PUSCH and / or PUCCH.

[0134] Wireless communication system supporting unlicensed frequency bands

[0135] Figure 8a and Figure 8b An example of a wireless communication system supporting an unlicensed band to which the present disclosure can be applied is illustrated. In the following description, a cell operating in a licensed band (hereinafter referred to as L band) is defined as an L cell, and a carrier of the L cell is defined as (DL / UL) LCC. In addition, a cell operating in an unlicensed band (hereinafter referred to as U band) is defined as a U cell, and a carrier of the U cell is defined as (DL / UL) UCC. The carrier / carrier frequency of a cell may refer to an operating frequency (e.g., center frequency) of the cell. Cells / carriers (e.g., CCs) are collectively referred to as cells.

[0136] When carrier aggregation is supported, a terminal can perform signal transmission / reception with a base station through multiple aggregated cells / carriers. When multiple CCs are configured in a single terminal, one CC can be set as a primary CC (PCC) and the remaining CCs can be set as secondary CCs (SCCs). Specific control information / channels (e.g., CSS PDCCH, PUCCH) can be configured to be sent and received through the PCC. Data can be sent and received through the PCC / SCC. Figure 8a As shown in FIG. 1 , when a terminal and a base station send and receive signals through LCC and UCC (non-independent (NSA) mode) of carrier aggregation, the LCC may be set as the PCC and the UCC may be set as the SCC. In the case where multiple LCCs are configured in the terminal, a specific LCC may be set as the PCC and the remaining LCCs may be set as the SCCs. Figure 8b As shown, the terminal and the base station can send and receive signals through a single UCC or a UCC of multiple carrier aggregation. That is, the terminal and the base station can send and receive signals only through the UCC (SA mode) without the LCC. At this time, one of the UCCs can be set as the PCC, and the remaining UCCs can be set as the SCC. In the unlicensed band of the 3GPP system, both the NSA mode and the SA mode can be supported.

[0137] Hereinafter, (unless otherwise specified) in the present disclosure, the above-mentioned signal transmission / reception operation in the unlicensed frequency band may be performed in all the above-mentioned arrangement scenarios.

[0138] Hereinafter, in the present disclosure, the above-mentioned carrier may also be described by being replaced with a channel.

[0139] Downlink signal transmission method via unlicensed frequency band

[0140] The base station may perform one of the following unlicensed band access procedures (eg, channel access procedure (CAP)) to transmit a downlink signal in the unlicensed band.

[0141] (1) First Downlink CAP Method

[0142] Fig. 9 A flow chart illustrating a channel access procedure (CAP) operation for a base station to perform downlink signal transmission through an unlicensed band. For downlink signal transmission (e.g., signal transmission including PDSCH / PDCCH) through an unlicensed band, the base station may start CAP (S910). The base station may randomly select a backoff counter N within a contention window (CW) according to step 1. Here, the value of N is set to an initial value N init (S920). init is selected as 0 to CW pany value between. Next, according to step 4, if the backoff counter value N is 0 (Y of S930), the base station terminates the CAP (S932). Next, the base station may perform Tx burst transmission including PDSCH / PDCCH (S934). On the other hand, if the backoff counter value is not 0 (N of S930), the base station decrements the backoff counter value by 1 according to step 2 (S940). Next, the base station checks whether the channel of the U cell is idle (S950), and if it is idle (Y of S950), the base station checks whether the backoff counter value is 0 (S930). On the other hand, in step S950, if the channel is not idle, that is, if the channel is busy (N of S950), the base station checks whether the channel is in a delay duration T longer than the slot time (e.g., 9 microseconds). d (longer than 25 microseconds) (S960). If the channel is idle within the delay duration (Y of S970), the base station may restart the CAP. Here, the delay duration may be composed of a 16 microsecond interval and the m immediately following it. p On the other hand, if the channel is busy during the delay duration (N of S970), the base station performs step S960 again and checks again whether the channel of the U cell is idle during the new delay duration.

[0143] Table 5 shows an example of m applied to CAP according to the channel access priority level. p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and changes in allowed CW sizes.

[0144] [Table 5]

[0145]

[0146] The contention window size applied to the first downlink CAP can be determined based on various methods. As an example, the contention window size can be adjusted based on the probability that the HARQ-ACK value corresponding to the PDSCH transmission is determined as NACK within a predetermined time interval (e.g., a reference TU). In the case where the base station performs downlink signal transmission including a PDSCH associated with a channel access priority level p in a carrier, if the probability that the HARQ-ACK value corresponding to the PDSCH transmission is determined as NACK within a reference time interval / opportunity k (or reference time slot k) is at least Z=80%, the base station increases the CW value set for each priority level to each next allowed higher priority. Alternatively, the base station maintains the CW value set for each priority level at an initial value. The reference time interval / opportunity (or reference time slot) can be defined as the starting time interval / opportunity (or starting time slot) for performing the latest signal transmission in a carrier where at least part of the HARQ-ACK feedback is available.

[0147] (2) Second Downlink CAP Method

[0148] Based on the second downlink CAP method described below, the base station may perform downlink signal transmission (eg, signal transmission including discovery signal transmission but not including PDSCH) through the unlicensed band.

[0149] When the length of the base station signal transmission interval is equal to or less than 1 ms, the base station is in the channel at least for the sensing interval T drs = 25 μs, a downlink signal (eg, a signal including discovery signal transmission but not including PDSCH) may be immediately sent through the unlicensed band. Here, T drs A time slot interval T sl = 9μs and the interval T f (=16μs) composition.

[0150] (3) The third downlink CAP method

[0151] The base station may perform the following CAP for downlink signal transmission through multiple carriers in the unlicensed frequency band.

[0152] 1) Type A: The base station performs CAP on multiple carriers based on a counter N defined according to each carrier (counter N considered in CAP), and performs downlink signal transmission based on the CAP.

[0153] - Type A1: The counter N of each carrier is independently determined, and downlink signal transmission through each carrier is performed based on the counter N of each carrier.

[0154] - Type A2: The counter N of each carrier is determined as the N value of the carrier having the largest contention window size, and downlink signal transmission through each carrier is performed based on the counter N of the carrier.

[0155] 2) Type B: The base station performs CAP based on the counter N only for a specific carrier among multiple carriers, and performs downlink signal transmission by determining whether channels of the remaining carriers are idle before signal transmission in the specific carrier.

[0156] - Type B1: A single contention window size is defined for multiple carriers, and the base station uses the single contention window size when performing CAP based on the counter N for a specific carrier.

[0157] - Type B2: Define a contention window size for each carrier and use the maximum contention window size among the contention window sizes to determine N for a specific carrier. init value.

[0158] Uplink signal transmission method through unlicensed frequency band

[0159] The terminal performs contention-based CAP in the unlicensed band for uplink signal transmission. The terminal performs type 1 or type 2 CAP in the unlicensed band for uplink signal transmission. Generally, the terminal can perform CAP (e.g., type 1 or type 2) configured by the base station for uplink signal transmission.

[0160] (1) Type 1 Uplink CAP Method

[0161] Fig.10 The flowchart of the type 1 CAP operation of the terminal for uplink signal transmission is illustrated. The terminal may start a channel access procedure (CAP) for signal transmission through an unlicensed band (S1010). The terminal may randomly select a backoff counter N within a contention window (CW) according to step 1. Here, the value of N is set to an initial value N init (S1020). init is selected as 0 to CW p any value between. Next, according to step 4, if the backoff counter value N is 0 (Y of S1030), the terminal terminates the CAP (S1032). Next, the terminal may perform Tx burst transmission including PDSCH / PDCCH (S1034). On the other hand, if the backoff counter value is not 0 (N of S1030), the terminal decrements the backoff counter value by 1 according to step 2 (S1040). Next, the terminal checks whether the channel of the U cell is idle (S1050), and if it is idle (Y of S1050), the terminal checks whether the backoff counter value is 0 (S1030). On the other hand, in step S1050, if the channel is not idle, that is, if the channel is busy (N of S1050), the terminal checks whether the channel is in a delay duration T longer than the slot time (e.g., 9 microseconds). d (longer than 25 microseconds) idle (S1060). If the channel is idle during the delay duration (Y of S1070), the terminal can restart the CAP. Here, the delay duration can be composed of a 16 microsecond interval and the m immediately following it. p On the other hand, if the channel is busy during the delay duration (N of S1070), the terminal performs step S1060 again and checks again whether the channel is idle during the new delay duration.

[0162] Table 6 shows an example of m applied to CAP according to the channel access priority level. p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and changes in allowed CW sizes.

[0163] [Table 6]

[0164]

[0165] The contention window size applied to the type 1 uplink CAP can be determined based on various methods. For example, the contention window size can be adjusted based on whether the new data indicator (NDI) value of at least one HARQ process associated with HARQ_ID_ref (i.e., the HARQ process ID of UL-SCH) is switched within a predetermined time interval (e.g., a reference TU). In the case where the terminal performs signal transmission in the carrier by using a type 1 channel access procedure associated with a channel access priority level p, if the NDI value of at least one HARQ process associated with HARQ_ID_ref is switched, the terminal sets the CW for each priority level p∈{1,2,3,4} p =CW min,p , otherwise, the terminal increases the CWp of each priority level p∈{1,2,3,4} to the next allowed higher value.

[0166] Reference time interval / opportunity n ref (or reference time slot n ref ) is determined as follows.

[0167] At the terminal in time interval / opportunity (or time slot) n g Receive UL authorization in time interval / opportunity (or time slot) n 0 , n 1 ,…,n w Internal time interval / opportunity (or time slot) n 0 In the case where the transmission including the UL-SCH is performed from start to finish without any gap, (here, the time interval / opportunity (or time slot) n w is the time interval / opportunity (or time slot) n g -3 before, the latest time interval / opportunity (or time slot) at which the terminal sends UL-SCH based on type 1 CAP), reference time interval / opportunity (or time slot) n ref is the time interval / opportunity (or time slot) n 0 .

[0168] (2) Type 2 Uplink CAP Method

[0169] In the case where the terminal uses the type 2 CAP to transmit an uplink signal (eg, a signal including a PUSCH) through an unlicensed band, the terminal may sense that the channel is at least within the sensing interval T. short_ul = 25 μs after the idle period, an uplink signal (eg, a signal including a PUSCH) is immediately transmitted through the unlicensed band. short_ul A time slot interval T sl = 9μs and the interval Tf (=16μs). T f Included in T f The idle time slot interval T at the starting point sl .

[0170] Downlink channel structure

[0171] The base station transmits a related signal to the terminal through a downlink channel described below, and the terminal receives a related signal from the base station through a downlink channel described below.

[0172] (1) Physical Downlink Shared Channel (PDSCH)

[0173] PDSCH carries downlink data (e.g., DL shared channel transport block (DL-SCH TB)) and applies modulation methods such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM. Codewords are generated by encoding TBs. PDSCH can carry up to 2 codewords. Scrambling and modulation mapping are performed on each codeword, and the modulation symbols generated from each codeword are mapped to one or more layers (layer mapping). Each layer is mapped to a resource together with a demodulation reference signal (DMRS) to generate an OFDM symbol signal and is sent through a corresponding antenna port.

[0174] (2) Physical Downlink Control Channel (PDCCH)

[0175] PDCCH carries downlink control information (DCI) and applies QPSK modulation method. One PDCCH consists of 1, 2, 4, 8 or 16 control channel elements (CCE) according to the aggregation level (AL). One CCE consists of 6 resource element groups (REGs). One REG is defined by one OFDM symbol and one (P)RB. Fig.11 An example of a single REG structure is shown. Fig.11 In , D represents the resource element to which DCI is mapped, and R represents the RE to which DMRS is mapped. DMRS is a frequency domain direction within a symbol and is mapped to the 1st, 5th, and 9th REs.

[0176] PDCCH is sent through a control resource set (CORESET). A CORESET is defined as a set of REGs with a given parameter set (e.g., SCS, CP length, etc.). Multiple OCRESETs of a terminal can overlap each other in the time / frequency domain. CORESET can be configured through system information (e.g., MIB) or terminal-specific (UE-specific) high-level (e.g., radio resource control (RRC)) signaling. Specifically, the number of RBs and the number of symbols (up to 3) that constitute a CORESET can be configured through high-level signaling.

[0177] For each CORESET, the precoder granularity in the frequency domain is configured via higher layer signaling as one of the following:

[0178] -sameAsREG-bundle: same as REG bundle size in frequency domain

[0179] -allContiguousRBs: Same number of contiguous RBs in the frequency domain as in CORESET

[0180] The REGs in a CORESET are numbered based on a time-first mapping scheme, i.e., the REGs are numbered sequentially starting from 0, starting from the first OFDM symbol in the lowest numbered resource block in the CORESET.

[0181] The CCE-to-REG mapping type is configured as one of a non-interleaved CCE-REG mapping type or an interleaved CCE-REG mapping type. Fig.12 illustrates an example of a non-interleaved CCE-REG mapping type, Fig.13 An example of an interleaved CCE-REG mapping type is illustrated.

[0182] - Non-interleaved CCE-REG mapping type (or centralized mapping type): 6 REGs of a given CCE constitute one REG bundle, and all REGs of a given CCE are continuous. One REG bundle corresponds to one CCE.

[0183] - Interleaved CCE-REG mapping type (or distributed mapping type): 2, 3, or 6 REGs of a given CCE constitute a REG bundle, and the REG bundle is interleaved in the CORESET. A REG bundle in a CORESET consisting of 1 OFDM symbol or 2 OFDM symbols consists of 2 or 6 REGs, and a REG bundle in a CORESET consisting of 3 OFDM symbols consists of 3 or 6 REGs. The size of the REG bundle is configured per CORESET.

[0184] Fig.14 An example of a block interleaver is illustrated. The number of rows (A) of the (block) interleaver used for the above interleaving operation is set to one of 2, 3 and 6. Given that the number of interleaving units of a CORESET is P, the number of columns of the block interleaver is equal to P / A. Fig.14 As shown, the write operation of the block interleaver is performed in a row-first direction and the read operation is performed in a column-first direction. A cyclic shift (CS) of the interleaving unit is applied based on an ID that can be configured independently of the ID configured for the DMRS.

[0185] The terminal performs decoding (i.e., blind decoding) on ​​a set of PDCCH candidates to obtain the DCI sent through the PDCCH. The set of PDCCH candidates decoded by the terminal is defined as a PDCCH search space. The search space set can be a common search space or a UE-specific search space. The terminal can obtain DCI by monitoring the PDCCH candidates in one or more search space sets configured by MIB or high-level signaling. Each CORESET configuration is associated with one or more search space sets, and each search space set is associated with a CORESET configuration. A search space set is determined based on the following parameters.

[0186] -controlResourceSetId: Indicates the control resource set associated with the search space set.

[0187] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity slot (slot unit) and the PDCCH monitoring slot offset (slot unit).

[0188] - monitoringSymbolsWithinSlot: indicates the PDCCH monitoring pattern within the slot used for PDCCH monitoring (eg, the first symbol of the control resource set).

[0189] -nrofCandidates: indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6 and 8) of AL={1, 2, 4, 8, 16}, respectively.

[0190] Table 7 illustrates characteristics according to each search space type.

[0191] [Table 7]

[0192]

[0193] Table 8 illustrates a DCI format transmitted through the PDCCH.

[0194] [Table 8]

[0195]

[0196] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (DL authorization DCI). DCI format 0_0 / 0_1 can be called UL authorization DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be called DL authorization DCI or DL ​​scheduling information. DCI format 2_0 is used to convey dynamic time slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to convey downlink preemption information to the terminal. DCI format 2_0 and / or DCI format 2_1 can be delivered to terminals within a single group via a group common PDCCH (i.e., a PDCCH delivered to the terminal defined as the group).

[0197] Uplink channel structure

[0198] The terminal transmits a related signal to the base station through an uplink channel described below, and the base station receives a related signal from the terminal through an uplink channel described below.

[0199] (1) Physical Uplink Shared Channel (PUSCH)

[0200] The PUSCH carries uplink data (e.g., UL shared channel transport block (UL-SCH TB)) and / or uplink control information (UCI), and is transmitted based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. In the case where the PUSCH is transmitted based on the DFT-s-OFDM waveform, the terminal transmits the PUSCH by applying transform precoding. As an example, if transform precoding is not possible (e.g., transform precoding is disabled), the terminal may transmit the PUSCH based on the CP-OFDM waveform, and if transform precoding is possible (e.g., transform precoding is enabled), the terminal may transform the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduled by UL grant in DCI or semi-statically scheduled (configured grant) based on higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmission may be performed based on a codebook or based on a non-codebook.

[0201] (2) Physical Uplink Control Channel (PUCCH)

[0202] The PUCCH carries uplink control information, HARQ-ACK and / or a scheduling request (SR), and is classified into a short PUCCH and a long PUCCH according to a PUCCH transmission length. Table 9 illustrates a PUCCH format.

[0203] [Table 9]

[0204]

[0205] PUCCH format 0 carries UCI with a maximum size of 2 bits and is sent through sequence-based mapping. Specifically, the terminal sends a specific UCI to the base station by sending one of multiple sequences through PUCCH of PUCCH format 0. Only when a positive SR is sent, the terminal sends PUCCH of PUCCH format 0 in the PUCCH resources configured for the corresponding SR.

[0206] PUCCH format 1 carries UCI of a maximum size of 2 bits, and modulation symbols are spread in the time domain by an orthogonal cover code (OCC) (configured differently depending on whether frequency hopping occurs). DMRS is transmitted in symbols where modulation symbols are not transmitted (ie, transmitted by time division multiplexing (TDM)).

[0207] PUCCH format 2 carries UCI with a bit size greater than 2 bits, and the modulation symbols are sent by frequency division multiplexing (FDM) with DMRS. DM-RS are located in symbol indexes #1, #4, #7, and 10 within a given resource block at a density of 1 / 3. Pseudo-noise (PN) sequences are used for DM_RS sequences. For 2-symbol PUCCH format 2, frequency hopping can be activated.

[0208] PUCCH format 3 does not support terminal multiplexing within the same physical resource block and carries UCI with a bit size greater than 2 bits. In other words, the PUCCH resources of PUCCH format 3 do not include any orthogonal cover codes. The modulation symbols are sent by time division multiplexing with DMRS.

[0209] PUCCH format 4 supports multiplexing of up to 4 terminals in the same physical resource block and carries UCI with a bit size greater than 2 bits. In other words, the PUCCH resources of PUCCH format 3 include orthogonal cover codes. Modulation symbols are sent through DMRS and TDM.

[0210] Network access and communication process

[0211] The terminal may perform a network access process. For example, when performing network (e.g., base station) access, the terminal may receive system information and configuration information required to perform the process and / or method described / proposed below, and store the information in a memory. The configuration information required for the present disclosure may be received via high-level (e.g., RRC layer, media access control (MAC) layer, etc.) signaling.

[0212] Fig.15 An example of network initial access and communication procedures applicable to the present disclosure is illustrated. In NR, physical channels and reference signals can be sent by using beamforming. In the case of supporting beamforming-based signal transmission, there may be a beam management process for aligning the beam between the base station and the terminal. In addition, the signal proposed in the present disclosure can be sent / received by using beamforming. In radio resource control (RRC) idle (IDLE) mode, beam alignment can be performed based on SSB. On the other hand, in RRC-CONNECTED mode, beam alignment can be performed based on CSI-RS (in DL) and SRS (in UL). At the same time, in the case where beamforming-based signal transmission is not supported, the beam-related operations described below can be skipped.

[0213] Reference Fig.15 , a base station (eg, BS) may periodically transmit SSB (S1502). Here, SSB includes PSS / SSS / PBCH. SSB may be transmitted by using beam scanning (refer to Fig.14 ). Next, the base station may send remaining minimum system information (RMSI) and other system information (OSI) (S1504). RMSI may include information required for the terminal to initially access the base station (e.g., PRACH configuration information). At the same time, after performing SSB detection, the terminal identifies the best SSB. Next, the terminal may send a RACH preamble (message 1 (Msg1)) to the base station by using a PRACH resource associated / corresponding to the index (i.e., beam) of the best SSB (S1506). The beam direction of the RACH preamble is associated with the PRACH resource. The association between the PRACH resource (and / or RACH preamble) and the SSB (index) may be configured by system information (e.g., RMSI). Next, as part of the RACH process, the base station may send a random access response (Msg2) as a response to the RACH preamble (S1508), the terminal may send Msg3 (e.g., RRC connection request) by using the UL grant in the RAR (S1510), and the base station may send a contention resolution message (Msg4) (S1512). Msg4 may include RRC connection setup.

[0214] When the RRC connection between the base station and the terminal is configured through the RACH process, subsequent beam alignment can be performed based on SSB / CSI-RS (in DL) and SRS (in UL). For example, the terminal can receive SSB / CSI-RS (S1514). SSB / CSI-RS can be used for the terminal to generate a beam / CSI report. At the same time, the base station can request a beam / CSI report from the terminal through DCI (S1516). In this case, the terminal can generate a beam / CSI report based on SSB / CSI-RS and send the generated beam / CSI report to the base station through PUSCH / PUCCH (S1515). The beam / CSI report may include beam measurement results, information about preferred beams, etc. The base station and the terminal can switch beams based on the beam / CSI report (S1520a and S1520b).

[0215] Next, the terminal and the base station may perform the process and / or method described below. For example, based on the configuration information obtained from the network access process (e.g., the system information acquisition process, the RRC connection process through the RACH, etc.), the terminal and the base station may process the information present in the memory (as proposed in the present disclosure), and send a radio signal or process and store a received radio signal. Here, the radio signal may include at least one of the PDCCH, PDSCH, and reference signal (RS) in the downlink, and at least one of the PUCCH, PUSCH, and SRS in the uplink.

[0216] Specific embodiments of the present disclosure

[0217] The present disclosure relates to full-duplex (FD)-based communications in an unlicensed frequency band in a wireless communication system, and in particular, to a technique for performing CAP operations during signal transmission using full-duplex communication. The present disclosure will describe various embodiments regarding signal transmission and CAP operations of a base station. However, the embodiments described below will also be applied to signal transmission and CAP operations of a terminal in the same manner or after slight modifications. In the present disclosure, an unlicensed frequency band refers to a frequency band used non-exclusively, and may also be referred to as other terms such as a shared spectrum or other terms with equivalent technical meanings. In addition, access to an unlicensed frequency band may be referred to as shared spectrum channel access.

[0218] FD operation for NR

[0219] In 5G, new service types are emerging, such as extended reality (XR), AI-based services, and self-driving cars, which have dynamic traffic in both DL and UL directions and require low-latency packet transmission. While supporting these diverse new use cases, the traffic load of 5G services will surge.

[0220] On the other hand, existing semi-static or dynamic TDD UL / DL configurations are limited by transmission time delay and interference between operators. Existing FDD schemes have limitations in efficient use of frequency resources in DL / UL directions. Therefore, in order to reduce latency and efficiently utilize resources in NR, the introduction of full-duplex (FD) operation in a single carrier is being discussed.

[0221] For examples of applying intra-carrier FD, subband-by-subband full-duplex (SB-FD) and spectrum-shared full-duplex (SS-FD) can be considered, such as Fig.16 shown. Fig.16 An example of full-duplex communication between carriers applicable to the present disclosure is illustrated. In SB-FD, DL and UL transmissions are performed in different frequency resources within the same carrier. That is, for the same time resources, DL and UL occupy different frequency resources. In SS-FD, DL and UL transmissions are performed in the same frequency resources or overlapping frequency resources within the same carrier. That is, for the same time resources, DL and UL can occupy the same frequency resources or overlapping frequency resources.

[0222] This FD operation can be used in combination with the existing half-duplex (HD) operation. For example, in HD-based TDD operation, only some time resources can be used for FD operation. In the time resources for performing FD operation, SB-FD or SS-FD operation can be performed.

[0223] Fig.17a and Fig.17b An example of coexistence of time resources with half-duplex (HD) operation and time resources with FD operation applicable to the present disclosure is illustrated. Fig.17a In , some time resources are operated as SB-FD, and the remaining time resources are operated as HD. Fig.17b In the example, some time resources are operated as SS-FD and the remaining time resources are operated as HD. Here, for example, the unit of the time resource may be a time slot or a symbol.

[0224] In the time resources operated as SB-FD, some frequency resources are used as DL resources and some frequency resources are used as UL resources. Between the DL and UL frequency resources, there may be a guard band, a guard frequency resource, or a guard subcarrier that is neither used as DL nor as UL but is cleared. In the time resources operated as SB-FD, all frequency resources can be used for both DL and UL. Alternatively, in order to reduce the impact from another adjacent carrier (e.g., adjacent carrier interference (ACI)), some frequency resources at one or both ends of the carrier may not be used for DL ​​and / or UL. That is, one or both ends of the carrier can be used as a guard band that is neither used for DL ​​nor for UL. Alternatively, in order to reduce the ACI that affects UL reception, one or both ends of the carrier can be used only for DL ​​transmission.

[0225] In the present disclosure, a time slot resource used as an HD operation is referred to as an HD time slot, a time slot resource used as an SB-FD operation and a time slot resource used as an SS-FD operation are referred to as an SB-FD time slot and an SS-FD time slot, respectively. In addition, an SS-FD time slot and an SS-FD time slot may be collectively referred to as an FD time slot. In the present disclosure, among all frequency resources used as time resources for FD operation, a frequency resource used for DL ​​operation is referred to as a DL subband, and a frequency resource used for UL operation is referred to as a UL subband. Fig.17a and Fig.17b As shown, the frequency resource used for DL ​​and UL operations is called an XL subband.

[0226] In the case of the above-mentioned FD operation, both the gNB and / or the terminal can perform the FD operation. That is, both the gNB and the terminal can simultaneously perform DL and UL operations in the same time resource by using the same frequency resource or different frequency resources. As another example, the gNB can perform the FD operation alone, while the terminal can perform the HD. The gNB can simultaneously perform DL transmission and UL reception in the same time resource by using the same frequency resource or different frequency resources, but the terminal can only perform DL reception or UL transmission in a specific time resource. In this case, the gNB can perform the FD operation by performing DL transmission and UL reception with different terminals at the same time.

[0227] The following description shows an example in which the gNB performs an FD operation and the terminal performs an HD operation. However, various embodiments of the present disclosure may be applied to a case in which both the gNB and the terminal perform an FD operation, or a case in which the gNB performs an HD operation and the terminal performs an FD operation.

[0228] As more and more communication devices require greater communication capacity, efficient use of limited frequency bands has become an important requirement for future wireless communication systems. Cellular communication systems such as LTE / NR systems are also considering traffic offloading methods using the 2.4GHz unlicensed frequency band, which is mainly used in existing WiFi systems or newly prominent unlicensed frequency bands such as 5 / 6GHz and 60GHz.

[0229] Basically, since the unlicensed band assumes that wireless transmission and reception are performed through competition between each communication node, each communication node is required to perform channel sensing before sending a signal, and no other communication node performs signal transmission. This sensing-after-sending operation is called LBT (Listen Before Talk) or CAP (Channel Access Procedure), and in particular, the operation of checking whether another communication node performs signal transmission is called carrier sensing (CS), and when it is determined that another communication node does not perform signal transmission, a clear channel assessment (CCA) has been identified. In the following description, LBT can be replaced by CAP.

[0230] The eNB / gNB or UE of the LTE / NR system should perform LBT to send signals in the unlicensed band (hereinafter referred to as "U band"). When the eNB / gNB or UE of the LTE / NR system sends signals, other communication nodes (such as the Wireless Gigabit Alliance (WiGig) or 802.11ad / ay of Wi-Fi) should perform LBT to prevent interference. For example, the Wi-Fi standard (e.g., 802.11ac) specifies the CCA thresholds for non-Wi-Fi signals and Wi-Fi signals as -62dBm and -82dBm, respectively. According to these restrictions, the STA or AP will not send a signal when it receives a non-Wi-Fi signal at a power higher than -62dBm so as not to cause interference.

[0231] The present disclosure proposes a CAP for a base station and / or terminal capable of operating in an FD mode in an unlicensed frequency band. When a base station / terminal capable of operating in an FD mode performs transmission in a specific frequency band, the base station / terminal can perform CAP by receiving in a frequency band adjacent to the specific frequency band, and start transmitting after the CAP is successful, thereby making efficient use of radio resources.

[0232] In the NR standard, the basic unit for performing CAP may correspond to approximately 20 MHz bandwidth, which is defined as a channel in TS 37.213 or an RB set in TS 38.214. The present disclosure may describe a channel or an RB set as LBTBW, which may be understood to have the same meaning.

[0233] Fig.18An example of CAP operation for communication in an unlicensed band applicable to the present disclosure is illustrated. In the case of CAP operation of a base station that cannot perform FD operation, such as Fig.18 As shown, when multi-channel CAP is performed for RB set #1 and RB set #2, if CAP is successful only for RB set #1 (for example, if the backoff counter value becomes 0 immediately before sending in time slot n), and CAP fails in RB set #2 (for example, if the backoff counter value does not reach 0 immediately before sending in time slot n due to busy channel), the base station can perform DL transmission in RB set #1.

[0234] On the other hand, the CAP operation of the base station capable of the FD operation is as follows. Fig.19 Another CAP operation example for communication in an unlicensed band applicable to the present disclosure is illustrated. Fig.19 As shown, the base station can keep performing CAP by receiving signals in RB set #2 while transmitting signals in RB set #1. Specifically, if the backoff counter value corresponding to RB set #2 is 2 immediately before the transmission in time slot n, the base station can perform CAP for RB set #2 simultaneously with the transmission in RB set #1 in time slot n. In addition, if the backoff counter value corresponding to RB set #2 reaches 0 immediately before the transmission in time slot n+1 due to channel idleness, the base station can also start transmitting signals in RB set #2.

[0235] The present disclosure proposes various embodiments regarding the relationship between RB sets and subbands (e.g., DL / UL / XL subbands) of SB-FD or SS-FD, a method for determining an energy detection (ED) threshold, a method for determining the start / end of COT, and a multi-channel CAP method.

[0236] Fig. 20 An example of a process of applying an FD operation to an unlicensed band in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig. 20 Signal exchange between the terminal 2010 and the base station 2020 is illustrated. Fig. 20 The terminal 2010 in the embodiment has FD capability and can be connected to the FD network by Fig. 20 The illustrated process receives configuration information about at least one FD operation time slot from the base station 2020 .

[0237] Reference Fig. 20In step S2001, the base station 2020 sends FD time slot configuration information to the terminal 2010. The FD time slot configuration information may indicate at least one of the time, frequency axis position and size of the time slot supporting SB-FD operation and the link direction (e.g., DL, UL, DL+UL). According to an embodiment, for a set of RBs belonging to one BWP, the base station 2020 may configure the DL / UL of each RB set by using the configuration information. Specifically, the base station 2020 may configure / indicate link information such as DL, UL, or DL+UL for each RB set.

[0238] In step S2003, the terminal 2010 performs CAP for the RB set configured as UL or DL+UL. Fig. 20 Not shown in the figure, when the CAP is completed, the terminal 2010 can perform UL transmission through the corresponding RB set. Fig. 20 Only the CAP operation of the terminal 2010 is shown, but according to another embodiment, the base station 2020 may also perform the CAP operation for DL ​​transmission.

[0239] Fig.21 An example of a process of transmitting a signal by using a license-exempt band in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.21 A method of operating a terminal is illustrated.

[0240] Reference Fig.21 , in step S2101, the terminal sends control information related to the communication frequency band and the link direction. Here, the control information includes at least one of system information, configuration information of the high layer, and control information of the physical layer. Specifically, the terminal may send system information including information related to the communication frequency band, send configuration information related to distinguishing UL resources and DL resources within the communication frequency band, or send information indicating the link direction applied within a specific time interval (e.g., time slot). For example, the control information may include information related to the link direction of a channel belonging to an unlicensed frequency band. In this case, according to an embodiment, the control information may indicate information related to the link direction according to each channel or each channel group, for example, whether FD operation is allowed according to each channel or each channel group. Here, a channel is a frequency axis unit for performing a CAP operation or an LBT operation, and may also be referred to as an RB set.

[0241] In step S2103, the terminal performs a CAP operation for the first channel and the second channel. For example, the terminal may perform a CAP operation based on the control information received in step S2101. The control information includes information about the link directions of multiple channels including the first channel and the second channel, and indicates the link direction of each of the first channel and the second channel as DL or DL+UL. Therefore, the terminal determines the first channel and the second channel as candidate channels for performing DL transmission and performs a CAP operation. Here, since the first channel and the second channel are unit resources for different CAP operations, the terminal performs a CAP operation independently in each of the first channel and the second channel. In other words, the terminal can determine the backoff counter values ​​of the first channel and the second channel and determine the availability of the channel (e.g., whether busy / idle).

[0242] In step S2105, the terminal transmits a signal in the first channel according to the CAP success. In other words, the terminal performs a CAP operation on the first channel and determines that the CAP is successful when determining that the channel is idle. Therefore, the terminal can occupy the first channel and transmit a signal during a predetermined time interval. Fig.21 In the embodiment of the present invention, the CAP for the second channel fails. That is, the terminal determines that only the CAP for the first channel is successful, and determines that the second channel is busy because it is occupied by other devices. Therefore, the terminal does not perform DL transmission in the second channel.

[0243] In step S2107, the terminal performs a CAP operation in the second channel. In other words, while the terminal is sending a signal in the first channel, it can receive a signal in the second channel and continue to perform the CAP operation by using the received signal. Since the terminal supports the FD operation and the frequency band including the first channel and the second signal band is configured to allow the FD operation, the terminal can send a signal in the first channel and receive a signal in the second channel.

[0244] [Implementation #1] In a certain FD time slot, a DL or UL or XL subband may be determined based on an RB set unit granularity. That is, a DL or UL or XL subband in a certain FD time slot may be configured as a single RB set or multiple RB sets.

[0245] For a certain time slot or all or some OFDDM symbols within a time slot, the base station can notify the link direction applied to a part of the frequency resources belonging to the carrier / BWP bandwidth through high-layer signaling (e.g., cell-specific or group-common or UE-specific RRC signaling) and / or L1 signaling (e.g., UE-specific DCI or UE group-common DCI) is DL or UL or DL+UL (e.g., SS-FD). Here, the minimum unit of resources indicated by the corresponding signaling can be an RB set, and the DL or UL or DL+UL area belonging to the bandwidth can be signaled in the RB set. For example, for a BWP consisting of 4 RB sets, RB set #1 and RB set #2 can be signaled as DL subbands, and RB set #3 and RB set #4 can be signaled as UL subbands.

[0246] According to the above-mentioned embodiments, control information related to the communication band and the link direction can be sent, and communication in the unlicensed band can be performed based on the control information. Here, the control information can be understood as for configuring the FD time slot. The FD time slot may include at least one subband. Here, according to various embodiments, for the subband in the FD time slot, the length value in the RB set unit (i.e., how many RB sets are included) can be set as the bandwidth. For example, if the subband size in the FD time slot is indicated as k, it means that the subband contains k RB sets. Alternatively, the subband in the FD time slot can be configured by using a bitmap of RB sets. Each bit in the bitmap corresponds to an RB set, and the RB set corresponding to the bit set to a positive value (e.g., 1) in the bitmap represents the RB set in the corresponding subband. Alternatively, a constraint can be added so that only a continuous RB set of k RB sets can be configured as an UL and / or DL ​​subband. With this in mind, a starting RB set index in the k RB sets and the number of RB sets starting from the starting RB set can be set / indicated. Specifically, corresponding combinations (of starting RB set index and number of RB sets) may be indexed, and one of the indexes may be set / indicated in a manner similar to the resource indication value (RIV) method of frequency domain resource allocation (FDRA) type 1.

[0247] According to an embodiment, the DL or UL or DL+UL of each RB set can be determined according to the CAP result of the base station and / or the terminal. For example, for a BWP including 4 RB sets, when the CAP of the base station is successful and occupies the channels of RB set #1 and RB set #2, RB set #1 and RB set #2 can be DL subbands. In addition, when the CAP of the terminal is successful and occupies the channels of RB set #3 and RB set #4, RB set #3 and RB set #4 can be UL subbands. According to the CAP result of each RB set, each RB set group or each BWP / carrier, it can be separately signaled whether the DL or UL or DL+UL can be determined. For example, for a specific RB set, if the signaling indicates that "DL or UL or DL+UL can be determined according to the CAP result", the DL or UL or DL+UL of the RB set may be different depending on whether the node where the CAP is successful is the base station and / or the terminal. On the other hand, for a specific RB set, if a signal is sent indicating that "DL or UL or DL+UL cannot be determined based on the CAP result", the DL or UL or DL+UL of the RB set can be predetermined / defined / configured / indicated, and the terminal (e.g., in the case of UL or DL+UL) or the base station (e.g., in the case of DL or DL+UL) can occupy the channel accordingly after the CAP. Therefore, the link direction determination for each RB set can be as follows Fig. 22 Execute as shown.

[0248] Fig. 22 An example of a process of determining a link direction of a channel in an unlicensed band in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig. 22 A method of operating a terminal is illustrated.

[0249] Reference Fig. 22 In step S2201, the terminal receives configuration information related to the link direction of each RB set. The configuration information related to the link direction of each RB set may be received as part of the configuration information related to the FD time slot or as separate control information. According to various embodiments, the configuration information related to the link direction of each RB set may indicate whether the link direction applied to each RB set depends on the CAP result, in other words, whether the link direction is variable according to the CAP result. For example, the configuration information related to the link direction of each RB set may indicate whether the link direction can be determined as DL or UL or DL+UL according to the CAP result.

[0250] In step S2203, the terminal identifies whether to apply a variable link direction to each RB set. Based on the configuration information received in step S2201, the terminal can identify whether to apply a variable link direction to each RB set. However, according to other embodiments, whether to apply a variable link direction can be indicated and identified not only in units of RB sets, but also in units of RB set groups or BWPs.

[0251] In step S2205, the terminal performs CAP for the RB set to which the variable link direction is applied. That is, if the variable link direction is applied, the link direction applied to the corresponding RB set is not fixed, so the terminal can perform CAP for the RB set. Fig. 22 Not shown in the figure, when the channel is successfully occupied by the CAP, the terminal can perform DL transmission in the RB set.

[0252] In step S2207, the terminal performs CAP on the RB set used for UL transmission among the RB sets to which the fixed link direction is applied. Here, the RB set used for UL transmission includes the RB set whose link direction is set to UL or DL+UL. In the case of the RB set used for DL ​​transmission, UL transmission is not allowed, so the terminal does not need to perform CAP on the RB set, and performs CAP on the remaining RB sets. In addition, although Fig. 22 Not shown in the figure, when the channel is successfully occupied by the CAP, the terminal can perform UL transmission in the RB set used for UL transmission.

[0253] As shown in Table 10 below, an intra-cell guard band can be configured between adjacent RB sets. The size of the intra-cell guard band is expressed in terms of the number of RBs, and a value of the number of RBs greater than or equal to 0 can be set as the size of the intra-cell guard band. In order to support SB-FD or SS-FD operation in an FD time slot, a guard band for adjusting the amount of self-interference may need to be configured between adjacent subbands. Here, SB-FD or SS-FD operation for the corresponding BWP / carrier may be allowed only when an intra-cell guard band greater than a predetermined size (e.g., X RBs) is configured. X can be predefined (e.g., X=0), or a default value of X can be predefined in the specification. Alternatively, the value of X can also be set by high-level signaling. In this case, the terminal can identify the size of the guard band by receiving control information or configuration information related to the size of X from the base station. In addition, based on the control information or configuration information related to the size of X, the terminal can determine whether FD operation is allowed between two RB sets with guard bands. In other words, for BWP / carriers that set the number of RBs less than or equal to X as intra-cell guard bands, specific time slots may be restricted to operate only as HD time slots. The following Table 10 is extracted from TS 38.214 V17.2.0 and describes procedures related to intra-cell guard bands.

[0254] [Table 10]

[0255]

[0256] [Implementation #2] If the ED threshold or its maximum value applied by the terminal before CAP success is denoted as TH#1, and while performing transmission after CAP success for channel #1, the ED threshold or its maximum value applied during CAP for another channel #2 is denoted as TH#2, then taking into account the self-interference of the transmission already performed in channel #1, the value of TH#2 can be defined as a relaxed value, that is, a value higher than the value of TH#1.

[0257] For example, in Fig.19 In the case shown, when the ED threshold or its maximum size applied when the terminal performs CAP for RB set #1 and RB set #2 before sending in time slot n is called TH#1, and the ED threshold or its maximum size applied when the terminal performs CAP for RB set #2 before sending in time slot n+1 is called TH#2, then the size of TH#2 may be greater than the size of TH#1. This is because the energy received and / or measured in RB set #2 may be increased by the interference leakage or self-interference of the UL signal sent by the terminal in time slot n. For example, when the value of {TH#2-TH#1} is defined as Y (>0 or ≥0), the size of Y can be predefined or set by high-level signaling. Here, the Y value or TH#2 value set by the base station or the Y value or TH#2 value determined by the rule may be different according to the UE capability reported by the terminal. The UE capability that depends on the Y value or TH#2 value may be the ability of the terminal to remove self-interference. Specifically, since the better the self-interference removal capability, the more self-interference can be removed, the CCA can be performed, so the Y value can be set to or defined as a lower value.

[0258] Fig.23 An example of a process of adaptively applying an ED threshold in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.23 Signal exchange between terminal 2310 and base station 2320 is illustrated.

[0259] Reference Fig.23 In step S2301, the terminal 2310 sends a report message to the base station 2320 to notify that the FD operation can be performed. For example, the terminal 2310 can report to the base station 2320 that the FD operation can be performed through UE capability report signaling.

[0260] In step S2303, the base station 2320 transmits configuration information related to the ED threshold applied while performing CAP during UL transmission to the terminal 2310. In other words, the base station 2320 can set the ED threshold applied when performing CAP on another channel while performing UL transmission in some channels.

[0261] In step S2305, if the terminal 2310 performs CAP during UL transmission, the terminal can apply the ED threshold according to the configuration information. For example, the terminal 2310 can perform CAP for channel #2 while performing UL transmission in channel #1, and in this case, the set relaxed ED threshold can be applied.

[0262] Fig.24 An example of a process of determining availability of a channel in a license-exempt band in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.24 A method of operating a terminal is illustrated.

[0263] Reference Fig.24 In step S2401, the terminal performs measurement to determine channel availability. Specifically, the terminal sets a backoff counter value and measures the energy value of a signal received from outside the corresponding RB set to determine whether to reduce the backoff counter value.

[0264] In step S2403, the terminal checks whether UL transmission is performed during the measurement. In other words, the terminal checks whether the measurement of step S2401 is performed by using the FD operation, specifically, whether a signal is received from the outside while performing UL transmission.

[0265] If UL transmission is performed during the measurement, the terminal determines whether the channel is busy / idle by using the first threshold value in step S2405. In other words, when determining whether the channel is occupied by another device based on the energy value as the measurement result of step S2401, the terminal uses the first threshold value (e.g., TH#1) as a threshold value to be compared with the measured energy value. Here, considering the influence of DL transmission, the first threshold value may be defined as a value greater than the second threshold value used below.

[0266] If DL transmission is not performed during the measurement, the terminal determines whether the channel is busy / idle by using the second threshold value in step S2407. In other words, when determining whether the channel is occupied by another device based on the energy value as the measurement result of step S2401, the terminal uses the second threshold value (e.g., TH#2) as a threshold value to be compared with the measured energy value.

[0267] Here, the difference Y between the first threshold and the second threshold can be set differently according to the degree of proximity between RB set #1 and RB set #2 or the transmit power value of the terminal. For example, since the larger the spacing between RB sets, the smaller the interference impact may be, a larger Y value may be applied when the spacing between RB set #1 and RB set #2 is small, and a smaller Y value may be applied when the spacing between RB set #1 and RB set #2 is large. As another example, since the amount of interference affecting neighbor frequency axis resources may increase as the base station power value increases, a larger Y value may be applied when the power value is large, and a smaller Y value may be applied when the power value is small.

[0268] [Implementation #3] In the case where a terminal capable of performing FD operation performs multi-channel CAP, even if CAP succeeds for some channels or RB sets in the scheduled or configured UL transmission resources, transmission for these channels or RB sets may be allowed.

[0269] In the current specification, in the case where the terminal holds UL resources for multiple channels scheduled (e.g., PUSCH indicated by a UL grant) or configured (e.g., Configuration Grant (CG)-PUSCH), if the CAP for any one channel is unsuccessful, the transmission in the UL resources shall be handled as described in the following Table 11. Table 11 is extracted from TS 37.213v17.2.0 and describes the CAP for UL multi-channel transmission.

[0270] [Table 11]

[0271]

[0272] As described in Table 11, in existing UL operations, when a terminal holds UL resources scheduled (e.g., PUSCH indicated by a UL grant) or configured (e.g., configuration grant (CG)-PUSCH) for multiple channels, if the CAP for any one channel is unsuccessful, transmission in the entire UL resources is not allowed. However, for terminals capable of FD, the following rule may be defined: even if the CAP for some channels is successful, UL transmission is allowed in these channels. This is because the terminal is capable of performing FD operations, and even when transmission is started in some channels, CAP operations may be performed on other channels at the same time. That is, this is because it may be more advantageous to start transmission after the channel for which CAP is successful is occupied. In this case, since transmission is initiated for some channels, channel access failure may not be reported to the upper layer. The corresponding operations of the terminal are as follows. Fig.25 described.

[0273] Fig.25An example of a process of transmitting a signal according to CAP success in a portion of allocated channels in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.25 A method of operating a terminal is illustrated.

[0274] Reference Fig.25 In step S2501, the terminal obtains UL resources including multiple channels. The UL resources can be obtained by dynamic scheduling or by allocation in a fixed manner (e.g., configuration grant (CG)). In other words, the terminal can receive control information for dynamically scheduling UL resources or receive information related to allocating UL resources in a fixed manner.

[0275] In step S2503, the CAP of the terminal in a part of the channels is successful. For example, specifically, the terminal determines a backoff counter value for each of the multiple channels, measures the energy of the received signal according to each channel, and adjusts each backoff counter value according to the energy measurement result. Here, the backoff counter value reaches 0 in a part of the channels included in the allocated UL resources.

[0276] In step S2505, the terminal performs UL transmission in some channels. That is, the terminal may transmit signals in some channels where CAP succeeds among multiple channels, but not transmit signals in some other channels (ie, in at least one channel where CAP fails).

[0277] although Fig.25 As not shown in the figure, the terminal may continue to perform the CAP operation in at least one channel where the CAP failed. As an example, in the case where a CG-PUSCH or PUSCH including RB set #1 and RB set #2 is configured or scheduled during time slot n or time slot n+1, even if CAP is successful only in RB set #1 at the beginning of time slot n, the terminal may start to transmit in RB set #1 and perform CAP for RB set #2. If CAP for RB set #2 is successful at the beginning of time slot n+1, the terminal may start to transmit CG-PUSCH or PUSCH for RB set #1 and RB set #2 from time slot n+1.

[0278] However, in this case, the RB set combination included in the transmitted CG-PUSCH or PUSCH may be different for each time slot / symbol. Therefore, in the case where the RB set combination constituting the CG-PUSCH or PUSCH is different for each time slot / symbol, in order to assist the base station in receiving, the terminal may include information about the RB set combination according to each time slot / symbol in the CG-PUSCH, PUSCH or DM-RS. In other words, by using at least a portion of the UL signal, the terminal can send information indicating some channels used for UL transmission based on CAP success in the current transmission opportunity.

[0279] In addition, in the case where the time interval for sending only a part of the RB set of configuration / indication resources is equal to or longer than a predetermined time (e.g., one time slot or a predefined or preset time), the following rule can be defined: the corresponding CG-PUSCH or PUSCH transmission should be stopped. Therefore, the UL resources wasted due to repeated CAP failures can be reduced. The corresponding operation of the terminal is as follows Fig.26 described.

[0280] Fig.26 An example of another process of transmitting a signal according to CAP success in a portion of allocated channels in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.26 A method of operating a terminal is illustrated.

[0281] Reference Fig.26 In step S2601, the terminal succeeds in CAP in a portion of the allocated channels. Specifically, the terminal determines a backoff counter value for each allocated channel, measures the energy of the received signal according to each channel, and adjusts each backoff counter value according to the energy measurement result. Here, the backoff counter value reaches 0 in a portion of the channels included in the allocated UL resources.

[0282] In step S2603, the terminal performs UL transmission in a part of the channels. That is, the terminal may transmit signals in a part of the channels where CAP succeeds among the multiple channels, and not transmit signals in another part of the channels (that is, in at least one channel where CAP fails). Fig.26 Not shown in the figure, the terminal may continue to perform the CAP operation in at least one channel where the CAP fails.

[0283] In step S2605, the terminal determines whether the transmission in a part of the channels lasts for a threshold time or longer. Here, the threshold time can be predefined or set by the base station. For example, before or during this process, the terminal can receive information related to the threshold time from the base station. If the time for performing transmission in a part of the channels does not reach the threshold time, the terminal can continue to perform transmission in a part of the channels in step S2603.

[0284] If the transmission in a part of the channels lasts for a threshold time or longer, the terminal suspends the transmission in all channels in step S2607. For example, if the allocated resource is CG-PUSCH, the terminal can stop the transmission in a part of the channels and request the base station to release CG-PUSCH.

[0285] According to the above embodiment, in the case where CAP is successful in a part of the channels, the terminal may continue to perform the CAP operation in at least one remaining channel. That is, the terminal may attempt to perform UL transmission again in at least one remaining channel. However, according to another embodiment, the terminal may not attempt to perform UL transmission in at least one remaining channel, but wait for DL ​​reception. That is, the terminal may perform UL transmission in a part of the channels and wait for DL ​​reception in the remaining channels.

[0286] [Implementation #4] Through the CAP application of the above implementation #3, when the terminal is capable of performing FD operation, the channel occupation start time may be different for each channel. Here, the start time of COT can be defined as follows.

[0287] (1) Implementation #4-1: In the case where the channel set in which the terminal performs a multi-channel CAP operation is called a "set_CH" or a "channel set", if any channel in the set_CH starts to be occupied, the time when the channel occupation starts can be defined as the start time of the COT. In other words, one COT can be defined at a time according to each set_CH. As described in Table 6, the length of the maximum COT (MCOT) is defined according to the channel access priority level (CAPC) value, the start time of the COT is defined according to each _CH, and the MCOT length can be applied starting from the defined start time. For example, Fig.19 As shown, even if the channel occupation start time is different according to each RB set or channel, the start time of COT can be defined as time slot n, and the channel occupation of the terminal is allowed only for the duration within MCOT starting from time slot n.

[0288] Fig. 27 An example of a process of transmitting a signal according to a channel occupancy time in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig. 27 A method of operating a terminal is illustrated.

[0289] Reference Fig. 27 In step S2701, the CAP of the terminal for the first channel in the first time slot is successful. Therefore, the terminal can configure MCOT in the first time slot and then allow the signal to be sent within the MCOT. Here, MCOT can be determined according to the priority level of the terminal for the first channel.

[0290] In step S2703, the terminal succeeds in the CAP for the second channel in the second time slot. Here, the terminal can successfully perform the CAP for the second channel while performing the transmission in the first time slot. In other words, the terminal successfully performs the CAP for the second channel before the COT of the first channel expires. That is, the terminal can receive a signal in the second channel while sending a signal in the first channel, and recognize that the second channel is in an idle state based on the received signal. Therefore, the terminal can configure the MCOT in the second time slot and then allow the signal to be sent within the MCOT. Here, according to an embodiment, the MCOT can be determined based on the COT end time in the first channel.

[0291] In step S2705, the terminal performs transmission in the first channel and the second channel based on the MCOT that expires at the same time. That is, the terminal can configure the same MCOT expiration time for the first channel and the second channel, and perform UL transmission. That is, when it is determined that the CAP for multiple channels is successful, even if the CAP success determination time is different for each channel, the terminal can terminate the MCOT at the same time. Therefore, when the terminal continuously transmits signals within the interval allowed by each channel, the signal transmission in the first channel and the second channel is all terminated at the same time. However, if the transmission of all signals is completed during an interval shorter than the MCOT, the transmission can be terminated in any one of the first channel or the second channel.

[0292] (2) Implementation #4-2: The start time of COT may be defined independently for each channel or each channel group belonging to set_CH. If two channels with different channel occupation start times due to different CAP success times have different CAPCs or carry independent UL signals, each channel may preferably be considered to have started COT independently of each other, and different MCOT limits may be applied. For example, Fig.19 As shown, in the case where the channel occupation start time is different according to each RB set or channel, the COT start time on RB set #1 can be defined as time slot n, and the channel occupation of the terminal is allowed only for the duration within the MCOT starting from time slot n. On the other hand, the COT start time on RB set #2 can be defined as time slot n+1, and the channel occupation of the terminal is allowed only for the duration within the MCOT starting from time slot n+1.

[0293] Fig.28 An example of another process of transmitting a signal according to a channel occupancy time in a wireless communication system according to an embodiment of the present disclosure is illustrated. Fig.28 A method of operating a terminal is illustrated.

[0294] Reference Fig.28In step S2801, the CAP of the terminal for the first channel in the first time slot is successful. Therefore, the terminal can configure the COT in the first time slot and then send a signal within the COT. Here, the COT can be determined based on the priority level of the terminal for the first channel.

[0295] In step S2803, the terminal succeeds in the CAP for the second channel in the second time slot. Here, the terminal can successfully perform the CAP for the second channel while performing the transmission in the first time slot. In other words, the terminal succeeds in the CAP for the second channel before the COT of the first channel expires. That is, the terminal can receive a signal in the second channel while sending a signal in the first channel, and recognize that the second channel is in an idle state based on the received signal. Therefore, the terminal can configure the COT in the second time slot and then send a signal within the COT. Here, according to an embodiment, the COT can be determined based on the priority level of the terminal for the second channel.

[0296] In step S2805, the terminal performs transmission in the first channel and the second channel based on the independently expired MCOT. That is, the terminal can independently configure the MCOT end time of the first channel and the MCOT end time of the second channel based on the CAP success time in each channel and perform UL transmission.

[0297] like Fig.28 As shown in the embodiment described, in the case where the CAP operation for multiple channels is performed based on the FD operation, the MCOT configuration according to the CAP success of each channel can be performed independently. However, according to another embodiment, the following rule can be defined so that among the channels belonging to set_CH, only for channels that do not belong to the same carrier / BWP, the COT start time is allowed to be managed independently as in embodiment #4-1, and for channels belonging to the same carrier / BWP, the COT start time can be configured in the same manner as in embodiment #4-2.

[0298] According to the above-mentioned various embodiments, when a base station and / or terminal capable of operating in FD mode performs transmission in a specific frequency band, CAP can be simultaneously performed by receiving in a frequency band adjacent to the frequency band, and transmission can be started after CAP is successful, thereby efficiently utilizing radio resources.

[0299] The example of the above-mentioned proposed method may be included as one of the implementation methods of the present disclosure, and thus may be regarded as a type of the proposed method. In addition, the above-mentioned proposed method may be implemented independently, or some of the proposed methods may be combined (or merged). The rule may be defined so that the base station notifies the UE of information on whether to apply the proposed method (or information about the rule of the proposed method) through a predefined signal (e.g., a physical layer signal or a higher layer signal).

[0300] Those skilled in the art will appreciate that the present disclosure can be implemented in other specific ways than those described herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above exemplary embodiments should be interpreted in all respects as illustrative and not restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, rather than by the above description, and it is intended that all changes that come within the meaning and equivalent range of the appended claims are covered therein. In addition, it will be apparent that some claims that refer to specific claims can be combined with another claim that refers to other claims other than the specific claims to constitute an embodiment, or new claims can be added by amendment after the application is submitted.

[0301] Industrial Applicability

[0302] Embodiments of the present disclosure are applicable to various radio access systems. Examples of various radio access systems include the 3rd Generation Partnership Project (3GPP) or 3GPP2 system.

[0303] The embodiments of the present disclosure are applicable not only to various radio access systems but also to all technical fields to which various radio access systems are applied. In addition, the proposed method is applicable to millimeter wave and terahertz wave communication systems using ultra-high frequency bands.

[0304] Additionally, embodiments of the present disclosure are applicable to a variety of applications, such as autonomous vehicles, drones, and the like.

Claims

1. A method for operating a terminal in a wireless communication system, the method comprising: receiving system information including information related to a communication frequency band; receiving configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; Based on at least one of the system information or the configuration information, performing a first channel access procedure CAP for a first channel and a second channel included in the communication frequency band; Based on the first CAP in the first channel being successful, sending a signal in the first channel; as well as performing a second CAP on the second channel during the transmission of the signal in the first channel, The configuration information includes information related to a first threshold of energy detection ED for the first CAP and a second threshold of ED for the second CAP.

2. The method according to claim 1, wherein: The configuration information indicates that sub-band-by-sub-band SB-FD operation is allowed in a frequency band including the first channel and the second channel.

3. The method according to claim 1, wherein: The configuration information indicates that a link direction of at least one of the first channel and the second channel is determined based on a result of the first CAP or the second CAP.

4. The method according to claim 1, wherein: Performing the second CAP on the second channel during the transmission of the signal in the first channel includes: performing the second CAP on the second channel based on configuring a guard band including RBs equal to or greater than a threshold number between the first channel and the second channel.

5. The method according to claim 1, further comprising: Information related to a threshold of a guard band between the first channel and the second channel is received to determine whether the second CAP for the second channel is allowed during transmission of the signal in the first channel.

6. The method according to claim 1, wherein: The second threshold is configured to be greater than the first threshold.

7. The method according to claim 1, wherein: The difference between the first threshold and the second threshold is determined according to the self-interference capability of the terminal.

8. The method according to claim 1, wherein: The information related to the first threshold and the second threshold includes a value indicating a difference between the first threshold and the second threshold.

9. The method according to claim 1, wherein: The first channel and the second channel are included in uplink resources that are dynamically scheduled or allocated in a configuration authorization CG method, and Wherein, based on the signal transmission in the first channel excluding the second channel continuing for a threshold time or longer, the transmission for the entire uplink resource is suspended.

10. The method according to claim 1, wherein: Based on the success of the second CAP for the second channel, an end time of a maximum channel occupancy time MCOT of the first channel and the end time of the MCOT of the second channel are configured to be identical to each other.

11. The method according to claim 1, wherein: Based on the second CAP success for the second channel, an end time of a maximum channel occupancy time MCOT of the first channel and the end time of the MCOT of the second channel are configured to be independent of each other.

12. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as a processor coupled to the transceiver, Wherein, the processor is configured to: sending system information including information related to a communication frequency band; sending configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; Based on at least one of the system information or the configuration information, performing a first channel access procedure CAP for the first channel and the second channel included in the communication frequency band; Based on the first CAP in the first channel being successful, sending a signal in the first channel; and During the transmission of the signal in the first channel, performing a second CAP for the second channel, and The configuration information includes information related to a first threshold of energy detection ED for the first CAP and a second threshold of ED for the second CAP.

13. A communication device, comprising: at least one processor; as well as at least one computer memory coupled to the at least one processor and storing instructions that, when executed by the at least one processor, indicate operations, The operations include: sending system information including information related to a communication frequency band; sending configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; Based on at least one of the system information or the configuration information, performing a first channel access procedure CAP for the first channel and the second channel included in the communication frequency band; Based on the first CAP in the first channel being successful, sending a signal in the first channel; and During the transmission of the signal in the first channel, performing a second CAP for the second channel, and The configuration information includes information related to a first threshold of energy detection ED for the first CAP and a second threshold of ED for the second CAP.

14. A non-transitory computer-readable medium storing at least one instruction, the non-transitory computer-readable medium including the at least one instruction executable by a processor, in, The at least one instruction controls the device to: sending system information including information related to a communication frequency band; sending configuration information related to distinguishing uplink resources from downlink resources in the communication frequency band; Based on at least one of the system information or the configuration information, performing a first channel access procedure CAP for the first channel and the second channel included in the communication frequency band; Based on the first CAP in the first channel being successful, sending a signal in the first channel; as well as During the transmission of the signal in the first channel, performing a second CAP for the second channel, and The configuration information includes information related to a first threshold of energy detection ED for the first CAP and a second threshold of ED for the second CAP.

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