Method and apparatus for performing uplink / downlink transmission in a wireless communication system.

Abstract

To provide a method and device for performing uplink / downlink transmission in a wireless communication system.SOLUTION: A method for receiving downlink transmission by a terminal comprises the steps of: performing uplink transmission to a base station, the uplink transmission related to channel occupancy shared between the base station and the terminal; and receiving, from the base station, downlink transmission performed after a gap from a time point at which the base station has received the uplink transmission, where the downlink transmission is performed on the basis of channel access performed by the base station, the channel access is performed on the basis of the gap, and information included in the downlink transmission and a resource through which the downlink transmission is performed are determined on the basis of whether the base station has configured, for the terminal, a threshold value of energy detection for the channel occupancy.SELECTED DRAWING: Figure 17

Description

[Technical Field] 【0001】 This specification relates to a wireless communication system, specifically to a method and apparatus for performing uplink / downlink transmission. [Background technology] 【0002】 Following the commercialization of 4G (4th generation) communication systems, efforts are being made to develop new 5G (5th generation) communication systems to meet the increasing demand for wireless data traffic. 5G communication systems are also referred to as "beyond 4G network" systems, "post-LTE" systems, or "NR (new radio)" systems. To achieve high data transmission rates, 5G communication systems include systems operating in ultra-high frequency (mmWave) bands above 6 GHz, as well as systems operating in frequency bands below 6 GHz to ensure coverage, with implementation at base stations and terminals being considered. 【0003】 The 3GPP (3rd Generation Partnership Project, registered trademark) NR system improves the efficiency of the network spectrum, enabling telecommunications carriers to provide more data and voice services with the given bandwidth. Therefore, the 3GPP (registered trademark, same below) NR system is designed to meet the demands for high-speed data and media transmission in addition to high-capacity voice support. The advantages of the NR system include high processing power, low latency, support for FDD (frequency division duplex) and TDD (time division duplex), an improved end-user environment, and low operating costs with a simple architecture, all on the same platform. 【0004】 For more efficient data processing, the NR system's dynamic TDD uses a method that varies the number of OFDM (orthogoal frequency division multiplexing) symbols available for uplink and downlink depending on the data traffic direction of the cell's users. For example, if a cell's downlink traffic is greater than its uplink traffic, the base station allocates a larger number of downlink OFDM symbols to a slot (or subframe). Information regarding the slot configuration should be transmitted to the terminal. 【0005】 To mitigate path loss in the ultra-high frequency band and increase the transmission distance of radio waves, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, hybrid beamforming (combining analog and digital beamforming), and large-scale antenna technologies are being discussed for 5G communication systems. Furthermore, in order to improve the system network, 5G communication systems are undergoing technological development related to advanced small cells, improved small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), vehicle-to-everything communication (V2X), wireless backhaul, non-terrestrial network communication (NTN), moving networks, cooperative communication, CoMP (coordinated multi-points), and interference cancellation.In addition, 5G systems have seen the development of advanced coding modulation (ACM) methods such as FQAM (hybrid FSK and QAM modulation) and SWSC (sliding window superposition coding), as well as advanced access technologies such as FBMC (filter bank multi-carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access). 【0006】 Meanwhile, the internet, a human-centered interconnected network where humans generate and consume information, is evolving into the Internet of Things (IoT) network, where distributed components such as objects exchange and process information. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technologies via connections to cloud servers and other systems, is also emerging. To realize IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, technologies such as sensor networks for connecting objects, machine-to-machine (M2M), and machine-type communication (MTC) are being researched. In an IoT environment, intelligent IT services are provided that collect and analyze data generated from connected objects to create new value in human life. IoT, through the integration and combination of conventional IT technologies and various industries, is being applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services. 【0007】 Therefore, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine-to-machine communication, and MTC are being realized through 5G communication technologies such as beamforming, MIMO, and array antennas. As mentioned above, the application of cloud radio access networks (cloud RAN) as a big data processing technology can also be considered an example of the fusion of 5G technology and IoT technology. In general, mobile communication systems were developed to provide voice services while ensuring user activity. 【0008】 However, mobile communication systems have gradually expanded their service scope to include not only voice but also data services, and have now developed to the point where they can provide high-speed data services. However, due to resource shortages and users' demand for high-speed services, there is a need for even more advanced mobile communication systems currently in service. 【0009】 Recently, with the proliferation of smart devices and the resulting explosion in mobile traffic, traditional licensed frequency spectrums, or licensed frequency bands alone, are struggling to cope with the increasing data usage required to provide cellular communication services. 【0010】 In this context, the use of unlicensed frequency spectrum or unlicensed frequency bands (e.g., 2.4 GHz band, 5 GHz band, etc.) to provide cellular communication services is being discussed as a solution to the spectrum shortage problem. 【0011】 Unlike licensed frequency bands, where telecommunications carriers secure exclusive frequency usage rights through procedures such as auctions, unlicensed frequency bands allow numerous communication devices to be used simultaneously without restriction, provided that only a certain level of adjacent band protection regulations are observed. Therefore, if unlicensed frequency bands are used for cellular communication services, it becomes difficult to guarantee the same level of communication quality as that provided with licensed frequency bands, and there is a risk of interference problems with wireless communication devices (e.g., wireless LAN devices) that previously used unlicensed frequency bands. 【0012】 In order to use LTE and NR technologies even in unlicensed bands, research on coexistence solutions with conventional unlicensed band devices and solutions for efficiently sharing radio channels with other radio channels should be carried out in advance. That is, in the unlicensed band, a robust coexistence mechanism (RCM) needs to be developed so that devices using LTE and NR technologies do not affect conventional unlicensed band devices. 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0013】 This specification aims to provide a method for performing uplink / downlink transmission by sharing channel occupancy started by a terminal in a wireless communication system. 【Means for Solving the Problems】 【0014】 This specification provides a method for receiving downlink transmission in a wireless communication system. 【0015】 Specifically, the method performed by the terminal includes: a step of performing uplink transmission related to channel occupancy shared between the base station and the terminal with the base station; and a step of receiving downlink transmission performed after a gap from the time when the base station receives the uplink transmission from the base station, wherein the downlink transmission is performed based on channel access performed by the base station, the channel access is performed based on the gap, and information included in the downlink transmission and resources for performing the downlink transmission are determined based on whether an energy detection threshold for channel occupancy has been configured for the terminal from the base station or not. 【0016】 The gap is characterized by being less than 16 us, 16 us, or 25 us. 【0017】 When the gap is less than 16us, the channel access is a channel access in which no channel sensing is performed; when the gap is 16us, the gap includes one sensing slot in the last 9us, and the channel access is configured to perform downlink transmission when the sensing slot is idle; and when the gap is 25us, the gap consists of a first section of 16us length including a first sensing slot of 9us length, and a second section of 9us length which is a second sensing slot, and the channel access is configured to perform downlink transmission when the first sensing slot and the second sensing slot are idle. 【0018】 When the base station configures an energy detection threshold for channel occupancy, the information included in the downlink transmission is characterized by including at least one of a unicast transmission and a non-unicast transmission for the terminal. 【0019】 If the base station has not configured an energy detection threshold for channel occupancy, the information included in the downlink transmission excludes unicast transmissions, and the maximum number of symbols for resources in which the downlink transmission is performed within the channel occupancy period is one of 2, 4, or 8. 【0020】 The characteristics of this system are that when the subcarrier spacing (SCS) is 15 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 2 symbols; when the SCS is 30 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 4 symbols; and when the SCS is 60 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 8 symbols. 【0021】 The uplink transmission is characterized by being a configured grant (CG)-physical uplink shared channel (PUSCH) performed on a resource already semi-statically configured by the base station. 【0022】 The CG-PUSCH further includes the step of configuring information for a table from the base station, which includes values ​​set for each of the one or more parameters for channel occupancy and one or more indices corresponding to the set values, wherein the CG-PUSCH includes CG-Uplink Control Information (UCI) which includes information indicating a first index among the one or more indices, and the downlink transmission is performed based on the values ​​set for each of the one or more parameters corresponding to the first index. 【0023】 The one or more parameters are characterized in that at least one of Channel Access Priority (CAPC), duration, and offset, wherein the CAPC is the CAPC used for channel occupancy, the duration is the number of slots in which the downlink transmission takes place, and the offset is the difference from the last slot in which the base station detected the CG-UCI to the slot in which the downlink transmission begins. 【0024】 The method further includes receiving an offset from the base station to indicate a resource available for the downlink transmission if the base station has not configured an energy detection threshold for channel occupancy, wherein the CG-PUSCH includes a CG-UCI containing information indicating that channel occupancy is possible, and the downlink transmission is performed on resources between resources located at a distance of the offset from the last resource in the slot where the base station detected the CG-UCI. 【0025】 The information included in the downlink transmission excludes unicast transmissions, and the maximum number of symbols for the resource in which the downlink transmission is performed within the channel occupied section is one of 2, 4, or 8. 【0026】 The characteristics of this system are that when the subcarrier spacing (SCS) is 15 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 2 symbols; when the SCS is 30 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 4 symbols; and when the SCS is 60 kHz, the resources transmitted via the downlink within the channel occupancy section are a maximum of 8 symbols. 【0027】 Furthermore, in this specification, a method for performing an uplink transmission in a wireless communication system, performed by a terminal, includes the steps of: a base station performing a first transmission, which is a configured grant (CG) uplink transmission, on a first resource; the CG uplink transmission being a transmission performed on a resource already semi-statically configured by the base station; and a base station performing a second transmission, which is a scheduled uplink transmission, on a second resource, wherein the first and second resources are contiguous in the time domain and, if one or more already configured conditions are met, the second transmission is performed on the second resource immediately after the last symbol of the first resource; and if the one or more already configured conditions are not met, the first transmission is dropped at the last symbol of the first resource. 【0028】 One of the one or more pre-set conditions is characterized in that the first transmission is performed based on channel access that performs random backoff using a variable-size contention window (CW). 【0029】 One of the one or more previously set conditions is characterized in that the resources allocated for the second transmission occupy all resource blocks (RB) in the same frequency domain as the resources allocated for the first transmission. 【0030】 One of the one or more previously set conditions is characterized in that, when the bandwidth part (BWP), which is a frequency domain resource allocated for the first transmission, consists of multiple LBT (Listen Before Talk) bandwidth subsets, the resources allocated for the second transmission occupy all resource blocks (RB) included in one or more of the LBT bandwidth subsets. 【0031】 The one or more of the previously set conditions is characterized in that the second transmission is performed based on a second CAPC value that is the same as or smaller than the first Channel Access Priority Class (CAPC) value used for channel access. 【0032】 One of the one or more previously set conditions is characterized in that the sum of the time domains of the first resource and the second resource does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value. 【0033】 Furthermore, in this specification, a terminal that performs a method of receiving a downlink transmission in a wireless communication system includes a communication module and a processor that controls the communication module, wherein the processor performs an uplink transmission to a base station associated with channel occupancy shared between the base station and the terminal, and receives a downlink transmission from the base station that is performed after a gap from the time the base station received the uplink transmission, the downlink transmission is performed based on channel access performed by the base station, the channel access is performed based on the gap, and the information included in the downlink transmission and the resources on which the downlink transmission is performed are determined based on whether or not an energy detection threshold for channel occupancy has been configured in the terminal from the base station. 【0034】 When an energy detection threshold for channel occupancy is configured from the base station, the information included in the downlink transmission includes at least one of a unicast transmission and a non-unicast transmission for the terminal; when an energy detection threshold for channel occupancy is not configured from the base station, unicast transmissions are excluded from the information included in the downlink transmission; and the maximum number of symbols for the resource in which the downlink transmission is performed within the channel occupancy section is one of 2, 4, or 8. [Effects of the Invention] 【0035】 This specification provides a method for performing a gap-based channel access procedure in order to perform downlink transmission when a dedicated channel initiated by a terminal is shared in a wireless communication system, thereby enabling efficient downlink transmission. 【0036】 This specification provides a method for performing uplink transmission when a dedicated channel initiated by a terminal is shared in a wireless communication system, thereby enabling efficient uplink transmission. [Brief explanation of the drawing] 【0037】 [Figure 1] This figure shows an example of a wireless frame structure used in wireless communication systems. [Figure 2] This figure shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. [Figure 3] This diagram illustrates the physical channels used in 3GPP systems and common signal transmission methods utilizing those physical channels. [Figure 4(a)] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 4(b)] This figure shows the SS / PBCH block for initial cell access in a 3GPP NR system. [Figure 5] This diagram shows the procedure for transmitting control information and control channels in a 3GPP NR system. [Figure 6] This diagram shows the CORESET (control resource set) through which the PDCCH (physical downlink control channel) is transmitted in a 3GPP NR system. [Figure 7] This diagram shows how to configure the PDCCH search space in a 3GPP NR system. [Figure 8] This is a conceptual diagram explaining career aggregation. [Figure 9] This is a diagram illustrating single-carrier and multiple-carrier communication. [Figure 10] This figure shows an example where the cross-carrier scheduling technique is applied. [Figure 11(a)] This figure shows the position of the OFDM symbol occupied by SSB within multiple slots of the licensed bandwidth in an NR system according to one embodiment of the present invention. [Figure 11(b)] This figure shows the position of the OFDM symbol occupied by SSB within multiple slots of the licensed bandwidth in an NR system according to one embodiment of the present invention. [Figure 12] This figure shows the position of the slots occupied by SSB within a half-wireless frame, i.e., 5ms, of the licensed bandwidth in an NR system according to one embodiment of the present invention. [Figure 13] This figure shows the position of the OFDM symbols occupied by the SSB within a slot containing 16 OFDM symbols according to one embodiment of the present invention. [Figure 14] This is a block diagram showing the configuration of a terminal and a base station according to one embodiment of the present invention. [Figure 15]This figure shows a downlink channel access procedure according to one embodiment of the present invention. [Figure 16] This figure shows a scheduled uplink transmission according to one embodiment of the present invention. [Figure 17] This flowchart shows a method for receiving a downlink transmission from a terminal according to one embodiment of the present invention. [Figure 18] This flowchart shows a method by which a terminal according to one embodiment of the present invention performs an uplink transmission. [Modes for carrying out the invention] 【0038】 The terminology used herein has been selected to be as widely used and general as possible, taking into account the function of the present invention; however, this may vary depending on the intentions, conventions, or emergence of new technologies of the articulate. In some cases, the applicant has arbitrarily selected certain terms, in which case their meaning will be described in the relevant section of the invention description. Therefore, it should be made clear that the terminology used herein should not be merely names of terms, but should be analyzed based on the substantive meaning of the terms and the overall content of this specification. 【0039】 Throughout the specification, when one configuration is said to be “connected” to another, this includes not only cases where they are “directly connected,” but also cases where they are “electrically connected” through other intermediate components. Furthermore, when a configuration is said to “include” a particular component, this means, unless otherwise stated, that it includes other components rather than excluding them. In addition, the limitations of “greater than” or “less than” a particular critical point may be appropriately replaced by “greater than” or “less than” depending on the embodiment. 【0040】 The following technologies are used in a variety of wireless connectivity systems, including CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA is implemented using radio technology such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA is implemented using radio technology such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA is implemented using radio technology such as IEEE802.11 (Wi-Fi), IEEE802.16 (WiMAX), IEEE802-20, and E-UTRA (Evolved UTRA). UTRA is part of UMTS (Universal Mobile Telecommunication System). 3GPP LTE (Long term evolution) is part of E-UMTS (Evolved UMTS) which uses E-UTRA, and LTE-A (Advanced) is an advanced version of 3GPP LTE. 3GPP NR is a system designed separately from LTE / LTE-A, and is intended to support eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communication), and mMTC (massive Machine Type Communication) services, which are requirements of IMT-2020. While this explanation will focus on 3GPP NR for clarity, the technical concept of this invention is not limited to this. 【0041】 Unless otherwise specified herein, a base station may include a gNB (next generation node B) as defined in 3GPP NR. Also, unless otherwise specified, a terminal may include a UE (user equipment). To facilitate understanding of the description below, each concept will be described separately in examples, but these examples can be combined and used in conjunction with each other. Terminal configuration in this disclosure may represent configuration by the base station. Specifically, the base station may transmit channels or signals to the terminal to configure the operation of the terminal or the values ​​of parameters used in the wireless communication system. 【0042】 Figure 1 shows an example of a wireless frame structure used in a wireless communication system. 【0043】 Referring to Figure 1, a radio frame (or radio frame) used in a 3GPP NR system has a length of 10 ms (ΔfmaxNf / 100) * Tc). A radio frame consists of 10 subframes (SF) of equal size, where Δfmax = 480 * 10³ Hz, Nf = 4096, Tc = 1 / (Δfref * Nf,ref), Δfref = 15 * 10³ Hz, and Nf,ref = 2048. Each of the 10 subframes within a single frame is assigned a number from 0 to 9. Each subframe has a length of 1 ms and consists of one or more slots determined by the subcarrier spacing. More specifically, the subcarrier spacing usable in a 3GPP NR system is 15 * 2 μkHz, where μ is the subcarrier spacing configuration, with values ​​from 0 to 4. In other words, 15kHz, 30kHz, 60kHz, 120kHz, or 240kHz are used as subcarrier intervals. A 1ms subframe consists of 2μm slots, each with a length of 2-μms. The 2μm slots within a subframe are each assigned numbers from 0 to 2μ-1. Similarly, the slots within a radio frame are each assigned numbers from 0 to 10*2μ-1. Time resources are divided by at least one of the following: radio frame number (also called radio frame index), subframe number (also called subframe index), or slot number (or slot index). 【0044】 Figure 2 shows an example of a downlink (DL) / uplink (UL) slot structure in a wireless communication system. In particular, Figure 2 shows the resource grid structure of a 3GPP NR system. 【0045】 Specifically, Figure 2 shows the structure of the resource grid in a 3GPP NR system. There is one resource grid per antenna port. Referring to Figure 2, a slot contains multiple orthogonal frequency division multiplexing (OFDM) symbols in the time domain and multiple resource blocks (RBs) in the frequency domain. An OFDM symbol also means a single symbol section. Unless otherwise specified, an OFDM symbol is sometimes simply called a symbol. One RB contains 12 consecutive subcarriers in the frequency domain. Referring to Figure 2, a signal transmitted from each slot may be represented by a resource grid containing Nsize,μgrid,x*NRBsc subcarriers and Nslotsymb OFDM symbols, where x=DL when the signal is a DL signal and x=UL when the signal is a UL signal. Nsize,μgrid,x represents the number of resource blocks (RBs) according to the subcarrier spacing of μ (where x is DL or UL), and Nslotsymb represents the number of OFDM symbols in the slot. NRBsc is the number of subcarriers that make up one RB, with NRBsc = 12. OFDM symbols are sometimes called cyclic shift OFDM (CP-OFDM) symbols or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols, depending on the multiple access scheme. 【0046】 The number of OFDM symbols included in one slot may vary according to the length of the cyclic prefix (CP). For example, in the case of normal CP, one slot contains 14 OFDM symbols, while in the case of extended CP, one slot may contain 12 OFDM symbols. In certain embodiments, the extended CP may only be used at a 60 kHz subcarrier spacing. In FIG. 2, for the sake of explanation, one slot is configured using, as an example, 14 OFDM symbols, but embodiments of the present disclosure may equally apply to slots having different numbers of OFDM symbols. Referring to FIG. 2, each OFDM symbol includes N size,μ grid,x *N RB sc subcarriers of this book. The types of subcarriers can be divided into data subcarriers for data transmission, reference signal subcarriers for transmitting reference signals, and guard bands. The carrier frequency is also called the center frequency (fc). 【0047】 One RB can be defined by N RB sc (e.g., 12) consecutive subcarriers in the frequency domain. For reference, a resource composed of one OFDM symbol and one subcarrier may be called a resource element (RE) or a tone. Thus, one RB can be composed of N slot symb *N RB sc resource elements. Each resource element in the resource grid can be uniquely defined by a pair of indices (k, l) within one slot. k can be an index assigned from 0 to N size,μ grid,x *N RB sc -1 in the frequency domain, and l can be an index assigned from 0 to N slot symb -1 in the time domain. 【0048】 For a UE to receive signals from or transmit signals to a base station, the UE's time / frequency may be synchronized with the base station's time / frequency. This is because, when the base station and UE are synchronized, the UE can determine the time and frequency parameters necessary to demodulate the DL signal and transmit the UL signal at the appropriate time. 【0049】 Each symbol in a radio frame used in time-division duplexing (TDD), i.e., in an unpaired spectrum, may consist of at least one of DL symbols, UL symbols, and flexible symbols. A radio frame used as a DL carrier in frequency-division duplexing (FDD), i.e., in a paired spectrum, may consist of DL symbols or flexible symbols, and a radio frame used as a UL carrier may consist of UL symbols or flexible symbols. DL symbols allow for DL ​​transmission but not UL transmission. UL symbols allow for UL transmission but not DL transmission. Flexible symbols may be determined to be used as DL or UL depending on the signal. 【0050】 Information about the type of each symbol, i.e., information representing any one of DL symbols, UL symbols, and flexible symbols, may be configured using cell-specific or common radio resource control (RRC) signals. Additionally, information about the type of each symbol may be configured additionally using UE-specific or dedicated RRC signals. The base station notifies i) the period of the cell-specific slot configuration, ii) the number of slots accompanied by only DL symbols from the beginning of the period of the cell-specific slot configuration, iii) the number of DL symbols from the first symbol of the slot immediately following the slot accompanied by only DL symbols, iv) the number of slots accompanied by only UL symbols from the end of the period of the cell-specific slot configuration, and v) the number of UL symbols from the last symbol of the slot immediately preceding the slot accompanied by only UL symbols, by using the cell-specific RRC signal. Here, a symbol that is not configured using either UL symbols or DL symbols is a flexible symbol. 【0051】 When information about symbol types is configured using UE-specific RRC signals, the base station may signal in the cell-specific RRC signal whether the flexible symbol is a DL symbol or a UL symbol. In this case, the UE-specific RRC signal cannot change a DL symbol or a UL symbol configured using the cell-specific RRC signal to another symbol type. The UE-specific RRC signal may signal the number of DL symbols among the Nslotsymb symbols of the corresponding slot for each slot, and the number of UL symbols among the Nslotsymb symbols of the corresponding slot. In this case, the DL symbols of the slot may be continuously configured using the first symbol to the i-th symbol of the slot. Additionally, the UL symbols of the slot may be continuously configured using the j-th symbol to the last symbol of the slot (where i < j). Among the slots, a symbol that is not configured using either UL symbols or DL symbols is a flexible symbol. 【0052】 The type of symbol consisting of the RRC signals described above is called a semi-static DL / UL configuration. In the semi-static DL / UL configuration consisting of the RRC signals described above, the flexible symbol is indicated as a downlink symbol, uplink symbol, or flexible symbol via dynamic SFI (slot format information) transmitted over the physical downlink control channel (PDCCH). In this case, the downlink symbol or uplink symbol consisting of the RRC signals is not changed to another symbol type. Table 1 shows an example of dynamic SFI that a base station instructs a terminal. 【0053】 [Table 1] 【0054】 In Table 1, D represents the downlink symbol, U represents the uplink symbol, and X represents the flexible symbol. As shown in Table 1, a maximum of two DL / UL switching operations are permitted in a single slot. 【0055】 Figure 3 illustrates the physical channels used in 3GPP systems (e.g., NR) and a typical signal transmission method utilizing these physical channels. 【0056】 When the UE is powered on or camp-on to a new cell, the UE performs an initial cell discovery (S101). Specifically, the UE may synchronize with the base station during the initial cell discovery. To this end, the UE may receive primary synchronization signals (PSS) and secondary synchronization signals (SSS) from the base station to synchronize with the base station and obtain information such as the cell ID. Subsequently, the UE may receive physical broadcast channels from the base station and obtain broadcast information in the cell. 【0057】 Upon completion of the initial cell discovery, the UE receives the physical downlink control channel (PDCCH) and the physical downlink shared channel (PDSCH) according to the information in the PDCCH. As a result, the UE can obtain more specific system information than the system information obtained through the initial cell discovery (S102). Here, the system information obtained by the UE is the cell-common system information necessary for the UE to operate correctly at the physical layer in the Radio Resource Control (RRC), and is also called remaining system information or system information block (SIB) 1. 【0058】 When a UE first accesses a base station or does not have radio resources for signal transmission, the UE may perform a random access procedure to the base station (operations S103-S106). First, the UE can transmit a preamble through a physical random access channel (PRACH) (S103), and can receive a response message for the preamble from the base station through the PDCCH and the corresponding PDSCH (S104). Once the UE receives a valid random access response message, the UE transmits data, including the UE's identifier, to the base station through a physical uplink shared channel (PUSCH), indicated by a UL authorization transmitted from the base station via the PDCCH (S105). Next, the UE waits to receive the PDCCH as an indication from the base station for collision resolution. If the UE successfully receives the PDCCH with the UE's identifier (S106), the random access process is terminated. During the random access process, the UE can obtain UE-specific system information at the RRC layer that is necessary for the UE to operate correctly at the physical layer. When the UE obtains UE-specific system information at the RRC layer, the UE enters RRC_CONNECTED mode. 【0059】 The RRC layer is used for message generation and management for control between terminals and the Radio Access Network (RAN). More specifically, base stations and terminals can use the RRC layer to broadcast cell system information necessary for all terminals in a cell, manage the transmission of paging messages, manage mobility and handover, report and control terminal measurements, and manage storage including terminal capability management and equipment management. In general, the update of signals transmitted in the RRC layer (hereinafter referred to as RRC signals) is longer than the transmission time interval (TTI) in the physical layer, so RRC signals can be maintained unchanged over long periods. 【0060】 After the procedure described above, the UE receives the PDCCH / PDSCH (S107) and transmits the physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) as a general UL / DL signal transmission procedure (S108). Specifically, the UE may receive downlink control information (DCI) through the PDCCH. The DCI may include control information such as resource allocation information for the UE. The format of the DCI may also vary depending on the intended use. The uplink control information (UCI) that the UE transmits to the base station through the UL includes DL / UL ACK / NACK signals, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI), etc. Here, the CQI, PMI, and RI may be included in the channel state information (CSI). In a 3GPP NR system, the UE may transmit control information such as the HARQ-ACK and CSI described above via PUSCH and / or PUCCH. 【0061】 Figure 4 shows the SS / PBCH block for initial cell access in a 3GPP NR system. 【0062】 When powered on or when a new cell is desired, the UE can obtain time and frequency synchronization with the cell and perform the initial cell discovery procedure. During the cell discovery procedure, the UE can discover the cell's physical cell identification information, NcellID. To this end, the UE can receive synchronization signals from the base station, such as a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), and synchronize with the base station. In this case, the UE can obtain information such as the cell identification information (ID). 【0063】 The synchronization signal (SS) is described in more detail with reference to Figure 4a. Synchronization signals can be classified into PSS and SSS. PSS can be used to obtain time-domain and / or frequency-domain synchronization, such as OFDM symbol synchronization and slot synchronization. SSS can be used to obtain frame synchronization and cell group ID. Referring to Figure 4a and Table 1, an SS / PBCH block can be constructed using 20 consecutive RBs (=240 subcarriers) in the frequency axis and 4 consecutive OFDM symbols in the time axis. In this case, within the SS / PBCH block, the PSS is transmitted in the first OFDM symbol, and the SSS is transmitted in the third OFDM symbol through subcarriers 56 to 182. Here, the smallest subcarrier index in the SS / PBCH block is numbered from 0. In the first OFDM symbol in which PSS is transmitted, the base station does not transmit signals through the remaining subcarriers, namely subcarriers 0-55 and 183-239. In addition, in the third OFDM symbol in which SSS is transmitted, the base station does not transmit signals through subcarriers 48-55 and 183-191. The base station transmits the physical broadcast channel (PBCH) through the remaining REs in the SS / PBCH block, excluding the signals mentioned above. 【0064】 [Table 2] 【0065】 The SS allows a total of 1008 unique physical layer cell IDs to be grouped into 336 physical layer cell identifier groups, each group containing three unique identifiers through a combination of three PSSs and SSSs such that each physical layer cell ID is part of only one physical layer cell identifier group. Thus, a physical layer cell ID NcellID = 3N(1)ID + N(2)ID can be uniquely defined by an index N(1)ID ranging from 0 to 335, representing a physical layer cell identifier group, and an index N(2)ID ranging from 0 to 2, representing a physical layer identifier within a physical layer cell identifier group. The UE can discover the PSS and identify one of the three unique physical layer identifiers. In addition, the UE can discover the SSS and identify one of the 336 physical layer cell IDs associated with a physical layer identifier. In this case, the PSS sequence dPSS(n) is as follows: 【number】 【0066】 Here, 【number】 And, 【number】 It is given as follows. 【0067】 Furthermore, the SSS sequence dSSS(n) is as follows: 【number】 【0068】 Here, 【number】 And, 【number】 It is given as follows. 【0069】 A radio frame with a length of 10 ms can be divided into two half-frames with a length of 5 ms. Referring to Figure 4b, the slot in which the SS / PBCH block is transmitted within each half-frame is described. The slot in which the SS / PBCH block is transmitted may be any one of cases A, B, C, D, and E. In case A, the subcarrier spacing is 15 kHz, and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at carrier frequencies above 3 GHz and below 6 GHz. In case B, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is {4,8,16,20}+28*n. In this case, n=0 at carrier frequencies below 3 GHz. In addition, n may be 0 or 1 at carrier frequencies above 3 GHz and below 6 GHz. In Example C, the subcarrier spacing is 30 kHz, and the start of the SS / PBCH block is the ({2,8}+14*n)th symbol. In this case, n=0 or 1 at carrier frequencies below 3 GHz. In addition, n may be 0, 1, 2, or 3 at carrier frequencies above 3 GHz and below 6 GHz. In Example D, the subcarrier spacing is 120 kHz, and the start of the SS / PBCH block is the ({4,8,16,20}+28*n)th symbol. In this case, n is 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, or 18 at carrier frequencies above 6 GHz. In Example E, the subcarrier spacing is 240 kHz, and the start of the SS / PBCH block is the ({8,12,16,20,32,36,40,44}+56*n)th symbol. In this case, for carrier frequencies above 6 GHz, n = 0, 1, 2, 3, 5, 6, 7, 8. 【0070】 Figure 5 shows the procedure for transmitting control information and control channels in a 3GPP NR system. Referring to Figure 5a, a base station may add a cyclic redundancy check (CRC) masked (e.g., by XOR operation) using a radio network temporary identifier (RNTI) to the control information (e.g., downlink control information (DCI)) (S202). The base station may scramble the CRC using an RNTI value determined according to the purpose / target of each piece of control information. A common RNTI used by one or more UEs may include at least one of the following: system information RNTI (SI-RNTI), paging RNTI (P-RNTI), random access RNTI (RA-RNTI), and transmit power control RNTI (TPC-RNTI). In addition, UE-specific RNTIs may include at least one of the following: cell temporary RNTI (C-RNTI) and CS-RNTI. Subsequently, the base station may perform channel coding (e.g., polar coding) (S204) and then perform rate matching according to the amount of resources used for PDCCH transmission (S206). The base station may then multiplex the DCI based on a control channel element (CCE)-based PDCCH structure (S208). In addition, the base station may apply additional processes such as scrambling, modulation (e.g., QPSK), and interleaving to the multiplexed DCI (S210), and then map the DCI to the resources to be transmitted. A CCE is the basic resource unit for a PDCCH, and one CCE may contain multiple (e.g., six) resource element groups (REGs). One REG may consist of multiple (e.g., twelve) REs. The number of CCEs used for one PDCCH may be defined as the aggregation level.In 3GPP NR systems, aggregation levels 1, 2, 4, 8, or 16 may be used. Figure 5b is a diagram relating CCE aggregation levels and PDCCH multiplexing, showing the type of CCE aggregation level used for a single PDCCH and the CCE transmitted within the control area accordingly. 【0071】 Figure 6 shows the control resource set (core set) that a physical downlink control channel (PDCCH) can transmit within in a 3GPP NR system. 【0072】 A coreset is a time-frequency resource in which PDCCHs, i.e., control signals for the UE, are transmitted. In addition, a search space, which will be described later, may be mapped to a coreset. Thus, a UE may monitor a time-frequency domain designated as a coreset, rather than monitoring all frequency bands for PDCCH reception, and can decode the PDCCH mapped to the coreset. A base station may configure one or more coresets per cell for the UE. A coreset may be configured using up to three consecutive symbols on the time axis. In addition, a coreset may be configured in units of six consecutive PRBs on the frequency axis. In the embodiment of Figure 6, coreset #1 is configured using consecutive PRBs, and coresets #2 and #3 are configured using non-contiguous PRBs. A coreset may be placed in any symbol within a slot. For example, in the embodiment of Figure 6, coreset #1 starts at the first symbol of the slot, coreset #2 starts at the fifth symbol of the slot, and coreset #9 starts at the ninth symbol of the slot. 【0073】 Figure 7 shows a method for setting up the PUCCH search space in the 3GPP NR system. 【0074】 To transmit a PDCCH to a UE, each core set may have at least one search space. In embodiments of this disclosure, the search space is a set of all time-frequency resources through which a UE's PDCCH can be transmitted (hereinafter, PDCCH candidates). The search space may include a common search space that all UEs of 3GPP NR are required to search in common, and terminal-specific or UE-specific search spaces that a particular UE is required to search. In the common search space, a UE may monitor a PDCCH that is set up to be searched in common by all UEs in a cell belonging to the same base station. In addition, UE-specific search spaces may be set up per UE so that a UE monitors a PDCCH allocated to each UE at different search space locations according to the UE. In the case of UE-specific search spaces, the search spaces between UEs may partially overlap or be allocated due to the limited control area through which a PDCCH is allocated. Monitoring a PDCCH involves blind decoding to find PDCCH candidates in the search space. When blind decoding is successful, it may be expressed that the PDCCH has been (successfully) detected / received, and when blind decoding fails, it may be expressed that the PDCCH has not been detected / received, or has not been successfully detected / received. 【0075】 For the sake of explanation, a PDCCH scrambled using a group-common (GC) RNTI previously known to one or more UEs to send DL control information to one or more UEs is called a group-common (GC) PDCCH or common PDCCH. In addition, a PDCCH scrambled using a terminal-specific RNTI already known to a particular UE to send UL scheduling information or DL ​​scheduling information to a particular UE is called a UE-specific PDCCH. Common PDCCHs may be contained within a common search space, and UE-specific PDCCHs may be contained within a common search space or within a UE-specific PDCCH. 【0076】 A base station may signal to each UE or UE group via the PDCCH about information relating to resource allocation for the transmission channels, namely the paging channel (PCH) and the downlink-shared channel (DL-SCH) (i.e., DL permission), or information relating to resource allocation for the uplink-shared channel (UL-SCH) and Hybrid Automatic Retransmission Request (HARQ) (i.e., UL permission). The base station may transmit PCH transport blocks and DL-SCH transport blocks via the PDSCH. The base station may transmit data, excluding certain control information or certain service data, via the PDSCH. In addition, UEs may receive data, excluding certain control information or certain service data, via the PDSCH. 【0077】 A base station may include information in a PDCCH about where the UE(s) PDSCH data will be transmitted to and how the corresponding UE will receive and decode the PDSCH data, and may transmit such a PDCCH. For example, suppose a DCI transmitted on a particular PDCCH is CRC masked using an RNTI named "A", and the DCI indicates that the PDSCH is allocated to a radio resource (e.g., frequency location) named "B", and indicates transmission format information (e.g., transport block size, modulation scheme, coding information, etc.) named "C". A UE monitors the PDCCH using the RNTI information it possesses. In this case, if there is a UE performing blind decoding of the PDCCH using the RNTI of "A", that UE will receive the PDCCH and, through the received PDCCH information, receive the PDSCH indicated by "B" and "C". 【0078】 Table 3 shows one embodiment of a physical uplink control channel (PUCCH) used in a wireless communication system. [Table 3] 【0079】 PUCCH can be used to transmit the following UL control information (UCI): 【0080】 - Scheduling Request (SR): Information used to request UL-SCH resources. 【0081】 - HARQ-ACK: A response to the PDCCH (indicating DL SPS release) and / or to the DL transport block (TB) on the PDSCH. HARQ-ACK indicates whether information transmitted on the PDCCH or PDSCH has been received. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (hereinafter, NACK), discontinuous transmission (DTX), or NACK / DTX. Here, the term HARQ-ACK is used in conjunction with HARQ-ACK / NACK and ACK / NACK. Generally, ACK may be represented by a bit value of 1, and NACK may be represented by a bit value of 0. 【0082】 - Channel Status Information (CSI): Feedback information on the DL channel. The UE generates it based on the CSI reference signal (RS) transmitted by the base station. Multi-input multiple-output (MIMO) related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI). The CSI can be divided into CSI part 1 and CSI part 2 according to the information indicated by the CSI. 【0083】 The 3GPP NR system may use five PUCCH formats to support various service scenarios, channel environments, and frame structures. 【0084】 PUCCH format 0 is a format capable of transmitting 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 0 can be transmitted through one or two OFDM symbols on the time axis and one RB on the frequency axis. When PUCCH format 0 is transmitted through two OFDM symbols, the same sequence on the two symbols may be transmitted through different RBs. In this case, the sequence may be a sequence that has been cyclically shifted (CS) from the base sequence used in PUCCH format 0. Through this, the UE can obtain frequency diversity gain. Specifically, the terminal can determine the cyclic shift (CS) value mcs by the Mbit bit UCI (Mbit=1 or 2). Alternatively, a base sequence of length 12 can be cyclically shifted based on a defined CS value mcs and transmitted by mapping the resulting sequence to 12 REs (Resonance Sequences) consisting of one OFDM symbol and one RB. If the terminal has 12 available cyclic shifts and Mbit=1, then 1-bit UCI 0 and 1 can be mapped to two cyclic shifted sequences, each with a cyclic shift value difference of 6. If Mbit=2, then 2-bit UCI 00, 01, 11, and 10 can be mapped to four cyclic shifted sequences, each with a cyclic shift value difference of 3. 【0085】 PUCCH format 1 transmits 1-bit or 2-bit HARQ-ACK information or SR. PUCCH format 1 is transmitted via a continuous sequence of OFDM symbols on the time axis and a single PRB on the frequency axis. Here, the number of OFDM symbols occupied by PUCCH format 1 is one between 4 and 14. More specifically, a UCI with Mbit=1 is modulated with BPSK. The terminal modulates a UCI with Mbit=2 with QPSK (quadrature phase shift keying). A signal is obtained by multiplying the modulated complex valued symbol d(0) by a sequence of length 12. The terminal transmits the obtained signal by spreading it with a time-axis OCC (orthogonal cover code) to the even-numbered OFDM symbols assigned to PUCCH format 1. The maximum number of different terminals that can be multiplexed on the same RB in PUCCH format 1 is determined by the length of the OCC used. For odd-numbered OFDM symbols in PUCCH format 1, the DMRS (demodulation reference signal) is spread across the OCC and mapped to them. 【0086】 PUCCH format 2 can deliver UCIs of more than 2 bits. PUCCH format 2 can be transmitted through one or two OFDM symbols on the time axis and one or more RBs on the frequency axis. When PUCCH format 2 is transmitted through two OFDM symbols, the sequences transmitted through the two OFDM symbols in different RBs may be the same as each other. Here, the sequence is a plurality of modulated complex value symbols d(0),...,d(M symbol -1) is acceptable. Here, M symbol is M bit It may be / 2. Through this, the UE can obtain frequency diversity gain. More specifically, M bit Bit UCI(M bit>2) is bit-level scrambled, QPSK modulated, and mapped to one or two OFDM symbols, where the number of RBs can be one between 1 and 16. 【0087】 PUCCH format 3 or PUCCH format 4 can deliver UCIs of more than 2 bits. PUCCH format 3 or PUCCH format 4 can be transmitted through a sequence of OFDM symbols on the time axis and one PRB on the frequency axis. The number of OFDM symbols occupied by PUCCH format 3 or PUCCH format 4 may be one of 4 to 14. Specifically, the UE uses π / 2-2 phase shift keying (BPSK) or QPSK for M bit Modulate the bit UCI (Mbit>2) to obtain the complex value symbol d(0)~d(M symb -1) is generated. Here, when using π / 2-BPSK, M symb =M bit And when using QPSK, M symb =M bit The value is / 2. The UE does not have to apply block-based spread to PUCCH format 3. However, the UE may apply block-based spread to one RB (i.e., 12 subcarriers) using a PreDFT-OCC of length 12 such that PUCCH format 4 may have a multiplexing capacity of 2 or 4. The UE performs transmit precoding (or DFT precoding) on ​​the spread signal and maps it to each RE to transmit the spread signal. 【0088】 In this case, the number of RBs occupied by PUCCH format 2, PUCCH format 3, or PUCCH format 4 may be determined according to the length and maximum code rate of the UCI transmitted by the UE. When the UE uses PUCCH format 2, the UE may transmit HARQ-ACK information and CSI information together through PUCCH. If the number of RBs that the UE can transmit is greater than the maximum number of RBs that PUCCH format 2, PUCCH format 3, or PUCCH format 4 can use, the UE may transmit only the remaining UCI information without transmitting some of the UCI information, according to the priority of the UCI information. 【0089】 PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured through an RRC signal to indicate frequency hopping within a slot. When frequency hopping is configured, the index of the RB to be frequency-hopped may be configured using the RRC signal. When PUCCH format 1, PUCCH format 3, or PUCCH format 4 is transmitted through N OFDM symbols on the time axis, the first hop may have floor(N / 2) OFDM symbols, and the second hop may have ceil(N / 2) OFDM symbols. 【0090】 PUCCH format 1, PUCCH format 3, or PUCCH format 4 may be configured to be transmitted repeatedly in multiple slots. In this case, the number K of slots in which the PUCCH is transmitted repeatedly may be determined by the RRC signal. The repeatedly transmitted PUCCH must begin at a fixed position OFDM symbol in each slot and must be of a constant length. When one of the OFDM symbols in a slot in which the UE is to transmit the PUCCH is indicated as a DL symbol by the RRC signal, the UE does not have to transmit the PUCCH in the corresponding slot and may delay the transmission of the PUCCH until the next slot in which it is to be transmitted. 【0091】 On the other hand, in a 3GPP NR system, a terminal can transmit and receive using a bandwidth smaller than or equal to the carrier (or cell) bandwidth. To this end, a terminal may have a bandwidth part (BWP) consisting of a contiguous portion of the carrier bandwidth. A terminal operating by TDD or in an unpaired spectrum may have up to four DL / UL BWP pairs per carrier (or cell). A terminal can also activate one DL / UL BWP pair. A terminal operating by FDD or in a paired spectrum may have up to four DL BWPs per downlink carrier (or cell) and up to four UL BWPs per uplink carrier (or cell). A terminal can activate one DL BWP and one UL BWP for each carrier (or cell). A terminal does not need to receive or transmit using time-frequency resources other than the activated BWPs. Activated BWPs can be called active BWPs. 【0092】 A base station can indicate to a terminal which of the configured BWPs (bandwidth points) are activated using downlink control information (DCI). The BWP indicated in the DCI is activated, and the other configured BWPs are deactivated. In a carrier (or cell) operating in TDD mode, the base station may include a bandwidth part indicator (BPI) indicating the activated BWP in the DCI that schedules a PDSCH or PUSCH to change the terminal's DL / UL BWP pair. The terminal can receive the DCI that schedules the PDSCH or PUSCH and identify the activated DL / UL BWP pair based on the BPI. In a downlink carrier (or cell) operating in FDD mode, the base station may include a BPI indicating the activated BWP in the DCI that schedules a PDSCH to change the terminal's DL BWP. In an uplink carrier (or cell) operating in FDD mode, the base station may include a BPI indicating the activated BWP in the DCI that schedules a PUSCH to change the terminal's UL BWP. 【0093】 Figure 8 is a conceptual diagram illustrating career integration. 【0094】 Carrier aggregation is a method by which a wireless communication system uses a wider frequency band by allowing a UE (Unified Element) to use multiple frequency blocks or cells (in a logical sense) composed of UL resources (or component carriers) and / or DL ​​resources (or component carriers) as one large logical frequency band. A single component carrier may also be referred to as a primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, for the sake of explanation, the term "component carrier" will be used below. 【0095】 Referring to Figure 8, as an example of a 3GPP NR system, the overall system bandwidth may include up to 16 component carriers, each component carrier may have a bandwidth of up to 400 MHz. A component carrier may include one or more physically continuous subcarriers. Although Figure 8 shows that each component carrier has the same bandwidth, this is just an example, and each component carrier may have a different bandwidth. Also, although each component carrier is shown as adjacent to each other on the frequency axis, the diagram is shown in a logical concept, and each component carrier may be physically adjacent to each other or separated from each other. 【0096】 A different center frequency may be used for each component carrier. Alternatively, a single common center frequency may be used for physically adjacent component carriers. In the embodiment shown in Figure 8, assuming that all component carriers are physically adjacent, center frequency A may be used for all component carriers. Furthermore, assuming that the component carriers are not physically adjacent to each other, center frequencies A and B may be used for each component carrier. 【0097】 When the entire system bandwidth is extended by carrier aggregation, the frequency bandwidth used for communication with each UE can be defined in units of component carriers. UE A may use the entire system bandwidth of 100 MHz and communicate using all five component carriers. UEs B1-B5 may use only 20 MHz bandwidth and communicate using one component carrier. UEs C1 and C2 may use 40 MHz bandwidth and communicate using two component carriers each. The embodiment in Figure 8 shows that UEC1 uses two non-adjacent component carriers and UEC2 uses two adjacent component carriers. 【0098】 Figure 9 illustrates single-carrier and multi-carrier communication. Specifically, Figure 9(a) shows a single-carrier subframe structure, and Figure 9(b) shows a multi-carrier subframe structure. 【0099】 Referring to Figure 9(a), in FDD mode, a typical wireless communication system may perform data transmission or data reception through one DL band and one UL band, corresponding to these. In another specific embodiment, in TDD mode, the wireless communication system may divide a radio frame in the time domain into UL time units and DL time units, and perform data transmission or data reception through the UL / DL time units. Referring to Figure 9(b), three 20 MHz component carriers (CCs) may be aggregated into UL and DL, respectively, so that a 60 MHz bandwidth can be supported. Each CC may or may not be adjacent to each other in the frequency domain. Figure 9(b) shows an example where the bandwidths of the UL CC and DL CC are the same and symmetric, but the bandwidth of each CC may be determined independently. In addition, asymmetric carrier aggregation with different numbers of UL CCs and DL CCs is possible. DL / UL CCs allocated / configured to a particular UE through RRC are sometimes called the serving DL / UL CCs of that particular UE. 【0100】 A base station may communicate with a UE by activating some or all of the UE's serving CCs, or by deactivating some of the CCs. The base station may change which CCs are to be activated / deactivated, and may change the number of CCs to be activated / deactivated. If the base station allocates CCs available to a UE as cell-specific or UE-specific, at least one of the allocated CCs may be deactivated unless the CC allocation to the UE is completely reconfigured or the UE is handed over. The CC that is not deactivated by the UE is called the Primary CC (PCC) or Primary Cell (PCell), and the CC that the base station can freely activate / deactivate is called the Secondary CC (SCC) or Secondary Cell (SCell). 【0101】 On the other hand, 3GPP NR uses the concept that a cell manages radio resources. A cell is defined as a combination of DL resources and UL resources, i.e., a combination of DL CC and UL CC. A cell may consist of DL resources only, or a combination of DL resources and UL resources. When carrier aggregation is supported, the coordination between the carrier frequencies of DL resources (i.e., DL CC) and UL resources (i.e., UL CC) may be indicated by system information. The carrier frequency refers to the center frequency of each cell or CC. A cell corresponding to a PCC is called a PCell, and a cell corresponding to an SCC is called a SCell. The carrier corresponding to a PCell in DL is a DL PCC, and the carrier corresponding to a PCell in UL is a UL PCC. Similarly, the carrier corresponding to a SCell in DL is a DL SCC, and the carrier corresponding to a SCell in UL is a UL SCC. Depending on the UE capability, a serving cell may consist of one PCell and zero or more SCells. If a UE is in the RRC_CONNECTED state but is not configured for or does not support carrier aggregation, it will have only one serving cell configured using only PCells. 【0102】 As described above, the term "cell" as used in carrier aggregation is distinct from the term "cell" which refers to several geographical areas where communication services are provided by a single base station or antenna group. That is, a single component carrier may also be called a scheduling cell, scheduled cell, primary cell (PCell), secondary cell (SCell), or primary SCell (PScell). However, in order to distinguish between cells referring to several geographical areas and cells in carrier aggregation, in this disclosure, cells in carrier aggregation are referred to as CCs, and cells in geographical areas are referred to as cells. 【0103】 Figure 10 shows an example where the cross-carrier scheduling technique is applied. When cross-carrier scheduling is set up, a control channel transmitted through the first CC can schedule a data channel transmitted through the first or second CC using a carrier indicator field (CIF). The CIF is included in the DCI. In other words, a scheduling cell is set up, and DL / UL permissions transmitted within the PDCCH area of ​​the scheduling cell schedule the PDSCH / PUSCH of the scheduled cell. That is, a search area for multiple component carriers exists within the PDCCH area of ​​the scheduling cell. A PCell can essentially be a scheduling cell, and a particular SCell may be designated as a scheduling cell by a higher layer. 【0104】 In the embodiment shown in Figure 10, it is assumed that three DL CCs are merged. Here, it is assumed that DL component carrier #0 is a DL PCC (or PCell), and DL component carriers #1 and #2 are DL SCCs (or SCells). In addition, it is assumed that the DL PCC is configured as a PDCCH that monitors CCs. When cross-carrier scheduling is not configured by UE-specific (or UE group-specific or cell-specific) upper-layer signaling, CIF is disabled, and each DL CC can send only a PDCCH to schedule its PDSCH without using CIF, according to the NR PDCCH rule (non-cross-carrier scheduling, self-carrier scheduling). On the other hand, when cross-carrier scheduling is configured by UE-specific (or UE group-specific or cell-specific) upper-layer signaling, CIF is enabled, and a particular CC (e.g., DL PCC) may send not only a PDCCH to schedule the PDSCH of DL CC A using CIF, but also a PDCCH to schedule the PDSCH of another CC (cross-carrier scheduling). On the other hand, PDCCH is not transmitted within another DL CC. Therefore, depending on whether cross-carrier scheduling is configured for the UE, the UE will either monitor a PDCCH without a CIF to receive a self-carrier scheduled PDSCH, or monitor a PDCCH with a CIF to receive a cross-carrier scheduled PDSCH. 【0105】 On the other hand, Figures 9 and 10 show the subframe structure of a 3GPP LTE-A system, and the same or a similar configuration may be applied to a 3GPP NR system. However, in a 3GPP NR system, the subframes in Figures 9 and 10 may be replaced with slots. 【0106】 Since most communications in conventional unlicensed bandwidths operate on an LBT (Low-Band Test) basis, channel access in NR-U systems also utilizes LBT to coexist with conventional equipment. Specifically, channel access methods on unlicensed bandwidths in NR are categorized into the following four categories depending on the presence / absence and application method of LBT. 【0107】 ●Category 1: No LBT 【0108】 -Tx entities do not perform LBT procedures for transmission. 【0109】 ●Category 2: LBT without random backoff 【0110】 -The Tx entity senses whether the channel is idle during the first interval without random backoff in order to perform a transmission. That is, immediately after the Tx entity senses that the channel is idle during the first interval, it performs a transmission through that channel. The first interval is a preset interval of length immediately before the Tx entity performs a transmission. In one embodiment, the first interval may be an interval of length 25us, but the present invention is not limited thereto. 【0111】 ●Category 3: LBT that uses a fixed-size CW to perform random backoff 【0112】 - The Tx entity obtains a random number within a fixed-size CW and sets it as the initial value of the backoff counter (or backoff timer) N, and uses the set backoff counter N to perform backoff. In other words, in the backoff procedure, the Tx entity decrements the backoff counter by 1 each time the channel is sensed to be idle during a preset slot period. Here, the preset slot period may be 9us, but the present invention is not limited to this. The backoff counter N is decremented by 1 from its initial value, and when the value of the backoff counter N reaches 0, the Tx entity transmits. On the other hand, in order to perform backoff, the Tx entity uses a second interval (i.e., a differ period T) d The Tx entity first senses whether the channel is idle during the second interval. According to an embodiment of the present invention, the Tx entity senses (or determines) whether the channel is idle during the second interval, depending on whether the channel is idle during at least a portion of the second interval (e.g., one slot period). The second interval is set based on the channel access priority class of the Tx entity and consists of a period of 16us and m consecutive slot periods, where m is a value set by the channel access priority class. If the Tx entity senses that the channel is idle during the second interval, it performs channel sensing to decrement the backoff counter. On the other hand, if the channel is sensed to be occupied during the backoff procedure, the backoff procedure is interrupted. After interrupting the backoff procedure, the Tx entity resumes backoff if the channel is sensed to be idle during an additional second interval. In this way, the Tx entity transmits if the channel is idle during the second interval plus the slot periods of the backoff counter N. In this case, the initial value of the backoff counter N is obtained within a fixed-size CW (Continuous Wave) transmission. 【0113】 ●Category 4: LBT that uses variable-size CW to perform random backoff 【0114】 - The Tx entity acquires a random number within a variable-size CW and sets it as the initial value of the backoff counter (or backoff timer) N, and then uses the set backoff counter N to perform backoff. More specifically, the Tx entity adjusts the size of the CW based on HARQ-ACK information for previous transmissions, but the initial value of the backoff counter N is acquired within the adjusted-size CW. The detailed process by which the Tx entity performs backoff is as described in Category 3. The Tx entity transmits if the channel is idle for the second interval plus the slot period of the backoff counter N. In this case, the initial value of the backoff counter N is acquired within a variable-size CW. 【0115】 In categories 1 to 4, the Tx entity is a base station or a terminal. In embodiments of the present invention, the first type of channel access refers to a category 4 channel access, and the second type of channel access refers to a category 2 channel access. 【0116】 Figure 11 shows the position of the OFDM symbol occupied by SSB within multiple slots of the licensed bandwidth in an NR system according to an embodiment of the present invention. 【0117】 SSB can contain four OFDM symbols and 20 RBs. Specifically, PSS occupies one OFDM symbol, SSS occupies one OFDM symbol, and PBCH can occupy two OFDM symbols and one OFDM symbol multiplexed with SSS and FDM. The position of the OFDM symbols within the slot occupied by SSB may change depending on the subcarrier spacing (SCS). Figure 11(a) shows the SSB pattern when the subcarrier spacing for SSB transmission is 15 kHz and 30 kHz, respectively. Figure 11(b) shows the SSB pattern when the subcarrier spacing for SSB transmission is 120 kHz and 240 kHz, respectively. When the subcarrier spacing is 30 kHz, either the SSB pattern for eMBB transmission or the SSB pattern considering URLLC may be used. In Figure 11, the hatched OFDM symbols indicate the position of the OFDM symbols within the slot occupied by SSB. Furthermore, different hatching patterns indicate that they correspond to different SSB indices. 【0118】 Figure 12 shows the location of slots occupied by SSB within a half-wireless frame, i.e., 5ms, of the licensed bandwidth in an NR system according to an embodiment of the present invention. In Figure 12, hatched slots indicate the location of slots containing SSB within a half-wireless frame. One slot can contain two SSBs. Two SSBs within a single slot may have different SSB indices. Also, SSBs located in different slots may have different SSB indices. SSB indices will be discussed further later. In Figure 12, L indicates the maximum number of SSBs that a base station can transmit in a half-wireless frame. 【0119】 The NR system specifies that one subcarrier spacing should be defined for each frequency band, reducing the complexity for terminals to search for SSB for initial cell access. Specifically, if a frequency band below 6 GHz is used, the NR system specifies that either a 15 kHz or 30 kHz subcarrier spacing should be used for SSB. If a frequency band above 6 GHz is used, the NR system specifies that either a 120 kHz or 240 kHz subcarrier spacing should be used for SSB. 【0120】 In unlicensed bands, the LBT procedure is used when a radio communication device accesses a channel. Therefore, if the channel is not idle, the radio communication device may fail to access the channel. Similarly, when a base station accesses a channel to transmit SSB, it may fail to access the channel, meaning that SSB transmission may not occur at the location set by the base station. Ultimately, even if the base station configures the terminal to assume the location where SSB is transmitted, the terminal may still not receive the SSB. Since SSB is transmitted periodically, even if the terminal fails to receive the SSB at any given time, it can receive it one cycle later. However, if the terminal receives the SSB in this way, a delay occurs in RRM measurement and measurement to neighboring cells. Ultimately, this increases latency across the entire system. 【0121】 Furthermore, SSB is used for beamlink configuration and beam operation. Specifically, the base station transmits multiple SSBs corresponding to different SSB indices in different time domains. The terminal uses multiple SSBs to configure multiple beamlinks. The base station performs beam sweeping. The terminal configures the beamlinks depending on whether it received SSBs transmitted in different time domains and on different beams. If the base station fails to access the channel and cannot transmit the SSB, a problem occurs where the beamlink cannot be configured. Ultimately, the latency for beamlinks increases due to the failure of channel access. Therefore, a method is needed to reduce SSB transmission failures and increase the opportunities for SSB transmission. 【0122】 If an NR system is used in an unlicensed band, 60kHz subcarrier spacing is used to transmit SSB in order to increase channel access opportunities. In licensed bands below 6GHz, 15kHz or 30kHz subcarrier spacing is used to transmit SSB. Also in licensed bands below 6GHz, 15kHz, 30kHz, or 60kHz subcarrier spacing is used to transmit data. In licensed bands above 6GHz, 120kHz or 240kHz subcarrier spacing is used to transmit SSB. Also in licensed bands above 6GHz, 60kHz or 120kHz subcarrier spacing is used to transmit data. If an NR system is used in an unlicensed band below 7GHz (e.g., below 7.125GHz), 15kHz or 30kHz subcarrier spacing may be considered, similar to the subcarrier spacing used in licensed bands below 6GHz. However, if 60kHz subcarrier spacing is used to transmit SSB in an unlicensed band, the spacing between OFDM symbols is reduced to one-quarter of that when 15kHz subcarrier spacing is used. Therefore, if 60kHz subcarrier spacing is used in an NR system in an unlicensed band, the transmission opportunities at the symbol level after channel access can be increased for SSB and data channels. If 15kHz and 30kHz subcarrier spacing are used, when a base station successfully accesses a channel within a single OFDM symbol, the time required to transmit the reservation signal is reduced when using 60kHz subcarrier spacing to allow time for transmission of the reservation signal. The following describes SSB transmission methods usable in an unlicensed band, particularly when 60kHz subcarrier spacing is used. 【0123】 NR-U DRS (or DRS) configuration 【0124】 In the unlicensed band of an NR system, a base station may transmit a signal that includes at least one SSB or at least one SSB burst set transmission. An SSB burst set is a series of SSB transmissions within a given time interval. In this case, the signal may be a discovery signal burst (DRS burst). A base station may transmit a DRS burst in accordance with the following principles: A base station may transmit a DRS burst in such a way that there is no gap in the time interval during which the DRS burst is transmitted within the beam. A base station may transmit a DRS burst in such a way that it satisfies the occupied channel bandwidth (OCB) requirement. However, in some cases, a base station may transmit a DRS burst in such a way that it does not satisfy the occupied channel bandwidth requirement. Furthermore, a base station may consider ways to minimize the channel occupancy time of the DRS burst and to enable rapid channel access. For convenience of explanation, a DRS burst is referred to as DRS. 【0125】 DRS transmitted in an unlicensed band may include a PDSCH containing RMSI (remaining system information), i.e., SIB1 (System Information Block 1), related to SSB. Furthermore, the DRS may include an RMSI-CORESET, which is the time and frequency resource area for control channel transmissions to transmit scheduling information for RMSI. That is, it may include a CORESET, which is the time and frequency resource area for transmitting a PDCCH that schedules the PDSCH containing SIB1. Furthermore, the DRS may include CSI-RS. Furthermore, the DRS may include other types of signals. Specifically, the DRS may include other system information (OSI) or paging. Therefore, when a base station transmits DRS in an unlicensed band, the base station can multiplex the DRS with physical channels or signals. At this point, the method by which the base station accesses the channels becomes important. In particular, the method by which the base station uses one of the various channel access methods described above and sets the parameters used for channel access becomes important. Furthermore, the DRS may include SSB or SSB burst set transmissions. 【0126】 In one embodiment of the present invention, when a base station multiplexes DRS with unicast data, the base station can perform channel access using a variable-size CW for the transmission of the multiplexed DRS and unicast data, where the size of the CW is determined by the channel access priority class. In this case, the terminal can perform channel access according to the channel access priority class of the unicast data being multiplexed. Specifically, the channel access method may be the first type of channel access described above. 【0127】 These embodiments describe cases where a base station multiplexes DRS with signals or information other than unicast data. Non-unicast data signals or information may represent signals or channels that are not data traffic and cannot establish a channel access priority class. Non-unicast data signals or information may include control messages related to initial connection, random access, mobility, or paging. Furthermore, non-unicast data signals or information may include transmissions containing only reference signals. Furthermore, non-unicast data signals or information may include transmissions containing only PDCCHs. A transmission containing only PDCCHs may include at least one of the following under the random access procedure: RACH message-4, handover command, group common PDCCH, short paging message, OSI (other system information), paging, and RAR (random access response). Non-unicast data signals or information may also be transmitted via PDCCHs and PDSCHs. For convenience of explanation, non-unicast data signals or information are referred to as non-unicast data. Furthermore, the multiplexing of DRS and non-unicast data as described herein can be interpreted as indicating that the corresponding transmission does not contain unicast data. In certain embodiments, when a base station multiplexes DRS with non-unicast data, the base station can perform channel access where only single-time interval (LBT) based LBT is performed for the transmission of the DRS and non-unicast data multiplexed together. Channel access where only single-time interval based LBT is performed may be the second type of channel access described above. In this case, the duration of the single-time interval may be 25us or 34us. 【0128】 In yet another specific embodiment, when a base station multiplexes DRS with non-unicast data, the base station can perform random backoff using a variable-size CW for the multiplexed transmission of DRS and non-unicast data, and perform channel access where the size of the CW is determined by the channel access priority class. Such embodiments take into account that single-time interval-based LBT can be performed only if the total duration of the transmission containing only DRS is 1 ms or less and the duty cycle of the DRS transmission is 1 / 20 or less. In such embodiments, the base station can use the channel access priority class with the highest priority (e.g., channel access priority class #1). This allows the base station to assign a higher priority to non-unicast data than to channel access compared to unicast data. Furthermore, while using the channel access priority class with the highest priority, the base station can use the smallest size of CW among the sizes of CW allowed in the corresponding channel access priority class. In yet another specific embodiment, the base station can use the largest size of CW among the sizes of CW allowed in the corresponding channel access priority class while using the channel access priority class with the highest priority. 【0129】 In yet another specific embodiment, when a base station multiplexes DRS with non-unicast data, the base station may perform channel access using a fixed-size CW to perform random backoff for the multiplexed transmission of DRS and non-unicast data. In this case, the channel access method may be a Category 3 channel access as described above. In such an embodiment, the base station may use the channel access priority class with the highest priority (e.g., channel access priority class #1). This allows the base station to assign a higher priority to non-unicast data than to channel access compared to unicast data. Furthermore, while using the channel access priority class with the highest priority, the base station may use the smallest CW size among the CW sizes allowed in the corresponding channel access priority class. In yet another specific embodiment, the base station may use the largest CW size among the CW sizes allowed in the corresponding channel access priority class while using the channel access priority class with the highest priority. 【0130】 When a base station transmits non-unicast data that is not multiplexed with the DRS, the base station can use the channel access method used when multiplexing non-unicast data with the DRS to access the channel for transmitting the non-unicast data. Specifically, when a base station transmits non-unicast data that is not multiplexed with the DRS, the base station can use the channel access type and channel access parameters used when multiplexing non-unicast data with the DRS. 【0131】 In yet another specific embodiment, when a base station transmits non-unicast data that is not multiplexed with DRS, the base station can perform channel access for the transmission of non-unicast data using a variable-size CW with random backoff, where the CW size is determined by the channel access priority class. Specifically, the channel access method may be the first type channel access described above. In such an embodiment, the base station can use the channel access priority class with the highest priority (e.g., channel access priority class #1). This allows the base station to give non-unicast data a higher priority than channel access compared to unicast data. Furthermore, while using the channel access priority class with the highest priority, the base station can use the smallest CW size among the CW sizes allowed in that channel access priority class. In yet another specific embodiment, while using the channel access priority class with the highest priority, the base station can use the largest CW size among the CW sizes allowed in that channel access priority class. 【0132】 In yet another specific embodiment, when a base station transmits non-unicast data that is not multiplexed with DRS, the base station can perform channel access with random backoff using a fixed-size CW for transmitting the non-unicast data. In this case, the channel access method may be the Category 3 channel access described above. In such an embodiment, the base station can use the channel access priority class with the highest priority (e.g., channel access priority class #1). This allows the base station to give non-unicast data a higher priority than channel access compared to unicast data. Furthermore, while using the channel access priority class with the highest priority, the base station can use the smallest CW size among the CW sizes allowed in that channel access priority class. In yet another specific embodiment, while using the channel access priority class with the highest priority, the base station can use the largest CW size among the CW sizes allowed in that channel access priority class. 【0133】 In the embodiment described above, the base station determined the channel access method for a transmission multiplexed with DRS and non-unicast data or unicast data, regardless of the duration of the transmission multiplexed with DRS and non-unicast data or unicast data, and the duty cycle of the DRS transmission. When the base station determines the channel access method, it can treat a transmission containing only DRS and a transmission multiplexed with DRS and non-unicast data the same. Specifically, the base station can determine the channel access method for a transmission multiplexed with DRS and non-unicast data or unicast data based on the duration of the transmission multiplexed with DRS and non-unicast data or unicast data and the duty cycle of the DRS transmission. The base station can determine the channel access method for a transmission multiplexed with DRS and non-unicast data or unicast data based on whether the duration of the transmission multiplexed with DRS and non-unicast data or unicast data is 1 ms or less, and whether the duty cycle of the DRS transmission is 1 / 20 or less. 【0134】 When a base station performs a multiplexed transmission of DRS and non-unicast data, the base station can select one of two channel access types depending on whether it satisfies both of the following two conditions: the duration of the multiplexed transmission of DRS and non-unicast data is 1 ms or less, and the duty cycle of the DRS transmission is 1 / 20 or less. In this case, one of the two channel access types is a channel access in which only single-time-interval-based LBT is performed, and the other is a channel access in which random backoff is performed using variable-size CW, and the size of the CW is determined by the channel access priority class. In a specific embodiment, if the duration of the multiplexed transmission of DRS and non-unicast data is 1 ms or less, and the duty cycle of the DRS transmission is 1 / 20 or less, the base station can perform a channel access in which only single-time-interval-based LBT is performed for the multiplexed transmission of DRS and non-unicast data. In this case, the duration of the single-time-interval may be 25 u. Furthermore, the single-time-interval-based LBT may be the second type of channel access described above. Furthermore, if the duration of a transmission with multiplexed DRS and non-unicast data is greater than 1 ms, or if the duty cycle of the DRS transmission is greater than 1 / 20, the base station can perform channel access for the multiplexed DRS and non-unicast data transmission using variable-size CW with random backoff, where the CW size is determined by the channel access priority class. The base station can also select any channel access priority class. In this case, the base station can arbitrarily select one of the channel access priority classes that satisfies the MCOT length condition based on the duration of the multiplexed DRS and non-unicast data transmission. The base station can use the selected channel access priority class for channel access for the multiplexed DRS and non-unicast data transmission.In other words, a base station can use the size of the CW (Continuous Wave) for channel access based on the selected channel access priority class. For example, a base station can use the channel access priority class with the highest priority (e.g., channel access priority class #1). This allows the base station to give non-unicast data a higher priority than channel access compared to unicast data. Furthermore, while using the channel access priority class with the highest priority, the base station can use the smallest CW size among the CW sizes allowed in that channel access priority class. In yet another specific embodiment, while using the channel access priority class with the highest priority, the base station can use the largest CW size among the CW sizes allowed in that channel access priority class. 【0135】 In such embodiments, if the base station can determine whether a terminal has received non-unicast data and whether the reception was successful, the base station can adjust the size of the CW based on the ratio of ACK to NACK. Specifically, the base station can convert feedback information for non-unicast data received by the terminal into ACK and NACK, and adjust the size of the CW based on the ratio of ACK to NACK. A channel access method in which random backoff is performed using a variable-size CW and the size of the CW is determined by the channel access priority class may be a first-type channel access. 【0136】 As mentioned above, base stations and terminals can adjust the size of the CW based on HARQ feedback when accessing channels using CW. However, base stations and terminals may not be able to expect HARQ feedback for all or part of the non-unicast data. Furthermore, base stations and terminals may not be able to determine whether they have received all or part of the non-unicast data, respectively. In addition, when base stations and terminals perform an initial connection procedure, they may not be able to determine HARQ-ACK feedback for some of the downlink signals and channels and uplink signals and channels used during the initial connection procedure. Furthermore, base stations and terminals may not transmit to a specific channel access priority class and may not be able to determine the HARQ-ACK feedback corresponding to the transmission to that channel access priority class. In such cases, a method for determining the CW to use in channel access when base stations and terminals transmit channels and signals that include all or part of the non-unicast data for which HARQ feedback cannot be expected will be described. For the sake of explanation, the explanation will mainly focus on the base station, but the following embodiments may also be applied to terminals. 【0137】 When a base station cannot determine the HARQ-ACK feedback for a transmission associated with a channel access priority class that determines the size of the CW, the base station may perform channel access with random backoff within the CW corresponding to the channel access priority class. In this case, the base station can use the smallest CW size among the CW sizes allowed in that channel access priority class. In yet another specific embodiment, the base station may use the channel access priority class with the highest priority while using the largest CW size among the CW sizes allowed in that channel access priority class. 【0138】 Furthermore, if the base station cannot determine whether the terminal has received all or part of the non-unicast data for which HARQ feedback cannot be expected, the base station may perform channel access with random backoff within a fixed CW size for transmission in which the non-unicast data and DRS are multiplexed. Specifically, the base station may use CW corresponding to any one of the channel access priority classes in the first type channel access described above. In a specific embodiment, the base station may use any one of the channel access priority classes that satisfy the MCOT length condition, depending on the duration of the transmission in which the non-unicast data and DRS are multiplexed in the first type channel access. The base station may use the channel access priority class with the highest priority. In a specific embodiment, the base station may use the channel access priority class with the highest priority among the channel access priority classes that satisfy the MCOT length condition, depending on the duration of the transmission in which the non-unicast data and DRS are multiplexed in the first type channel access. In addition, the base station may use the smallest CW size among the CW sizes allowed in the channel access priority class while using the channel access priority class with the highest priority. In yet another specific embodiment, the base station may use the channel access priority class with the highest priority, and use the largest CW size among the CW sizes allowed in that channel access priority class. 【0139】 In further specific embodiments, if a base station cannot determine whether a terminal has received all or part of non-unicast data for which HARQ feedback cannot be expected, the base station may perform the aforementioned Category 3 channel access for a transmission in which the non-unicast data and DRS are multiplexed. The base station may use the channel access priority class with the highest priority. Depending on the duration of the transmission in which the non-unicast data and DRS are multiplexed, the base station may use the channel access priority class with the highest priority that satisfies the MCOT length requirements. Furthermore, while using the channel access priority class with the highest priority, the base station may use the smallest CW size among the CW sizes allowed in that channel access priority class. In yet another specific embodiment, while using the channel access priority class with the highest priority, the base station may use the largest CW size among the CW sizes allowed in that channel access priority class. 【0140】 A base station may be unable to transmit an SSB due to a failure in the channel access procedure (e.g., LBT). An SSB transmit window may be defined so that if the base station cannot transmit an SSB at a configured location, it can transmit it at another location. The SSB transmit window is a time interval in which the base station can transmit an SSB, and includes multiple candidate SSB transmit locations. If the base station is unable to initiate an SSB transmit at any one candidate SSB transmit location, it can attempt to transmit an SSB at a later SSB transmit location within the SSB transmit window. An SSB transmit location is a point in time when the base station can initiate an SSB transmit. If a terminal is unable to receive an SSB at any one candidate SSB transmit location within the SSB transmit window, the terminal can receive an SSB at a later SSB transmit location within the SSB transmit window. At this point, the terminal can determine whether the base station was unable to initiate an SSB transmit at the candidate SSB transmit location or whether the base station failed to transmit the SSB. In a specific embodiment, if a terminal fails to receive an SSB at any of the SSB transmission candidate positions within the SSB transmission window, the terminal may attempt to receive an SSB at the next SSB transmission candidate position within the same SSB transmission window. After the terminal starts and completes SSB reception at any of the SSB transmission candidate positions, the terminal does not need to expect to receive any further SSBs within that SSB transmission window. Specifically, after the terminal starts and completes SSB reception at any of the SSB transmission candidate positions, the terminal does not need to attempt to receive any further SSBs within that SSB transmission window. 【0141】 In further specific embodiments, if a terminal fails to receive a specific SSB at any of the SSB transmission candidate positions within the SSB transmission window, the terminal may attempt to receive the specific SSB at the next SSB transmission candidate position within that SSB transmission window. After the terminal starts receiving a specific SSB at any of the SSB transmission candidate positions and completes the reception of the specific SSB, the terminal does not need to attempt to receive the specific SSB again within that SSB transmission window. Specifically, after the terminal receives a specific SSB at any of the SSB transmission candidate positions, the terminal does not need to attempt to receive the specific SSB again within that SSB transmission window. 【0142】 In yet another specific embodiment, even after a terminal has completed receiving a specific SSB at any of the SSB transmission candidate locations, the terminal can attempt to receive the specific SSB within that SSB transmission window. This is because the terminal can receive the specific SSB again and obtain a combining gain from the further received SSB. Such embodiments may apply not only when multiple SSBs corresponding to different beam indices are transmitted for beam operation, but also when an omni-TX transmission method is used. Specifically, it may also apply when the same SSB is transmitted repeatedly. 【0143】 DRS LBT method 【0144】 Figure 13 shows the position of the OFDM symbols occupied by the SSB according to an embodiment of the present invention within a slot containing 14 OFDM symbols. 【0145】 The following describes a channel access method for a DRS containing one or more SSBs, with reference to Figure 13. Specifically, it describes a channel access method that a base station performs before transmitting a DRS, depending on the number of SSBs included in the DRS transmitted by the base station, and how to configure it so that different LBTs can be performed. 【0146】 Figure 13 shows the position of OFDM symbols occupied by SSBs within a slot composed of 14 OFDM symbols. SSB pattern A is identical to the position of OFDM symbols occupied by SSBs in NR systems as defined in 3GPP Rel.15. In SSB pattern B, the OFDM symbols occupied by SSBs in the second half slot within a single slot are positioned one symbol later than in SSB pattern A. Therefore, in SSB pattern B, the positions of OFDM symbols occupied by SSBs within a single slot are set to be symmetrical on a half-slot basis. 【0147】 A base station can perform multiple transmissions and determine a channel access method for each of the multiple DRS transmissions if the total duration of the transmissions, including DRS, is 1 ms or more. 【0148】 When an unlicensed band in the 5GHz or 6GHz range is used, the base station can transmit up to n SSBs to the DRS. In this case, the value of n may be 2, 4, or 8. The subcarrier spacing used for DRS transmission may be 15KHz or 30KHz. When the subcarrier spacing is 15KHz, the duration of one slot is 1ms, and the number of SSBs that can be included in a 1ms interval may be 2. When the subcarrier spacing is 30KHz, the duration of one slot is 0.5ms, and the number of SSBs that can be included in a 1ms interval may be 4. Depending on the DRS transmission period setting, the total duration of DRS transmission with a duty cycle of 1 / 20 may change. 【0149】 As mentioned above, the total duration of a transmission including DRS may be 1 ms or less, and the duty cycle of the DRS transmission may be 1 / 20 or less. In this case, when the base station performs a transmission including only DRS, or a transmission with DRS and non-unicast data multiplexed together, the base station may perform channel access where only single-time interval-based LBT is performed for the transmission. Channel access where only single-time interval-based LBT is performed may be the second type channel access described above. The total duration of a transmission including DRS may be greater than 1 ms, or the duty cycle of the DRS transmission may be greater than 1 / 20. In this case, when the base station performs a transmission including only DRS, or a transmission with DRS and non-unicast data multiplexed together, the base station may perform channel access where random backoff is performed using a variable-size CW, and the size of the CW is determined by the channel access priority class. In this case, the channel access method in which random backoff is performed using a variable-size CW, and the size of the CW is determined by the channel access priority class, may be the first type channel access. 【0150】 In one embodiment of the present invention, a method may be used in which the base station performs single-time interval-based LBT, taking into account the characteristics of the transmission including DRS. When the total duration of the transmission including DRS is greater than 1 ms, the base station can determine the channel access method in 1 ms duration units. Specifically, when the total duration of the transmission including DRS is greater than 1 ms, the base station can perform multiple transmissions, each with a duration of 1 ms or less, and perform channel access including only single-time interval-based LBT for each of the multiple transmissions. The base station can apply this embodiment only when the duty cycle of the DRS transmission is 1 / 20 or less. This is because there is an ETSI provision that in the case of transmissions without LBT, the short control signal must not exceed 5% of the transmission. With this embodiment, the base station and the terminal can quickly perform initial connection and RRM measurement using the SSB included in the DRS transmitted from the base station. For example, if the DRS transmission period is set to 40ms or more, and the base station transmits DRS within a 5ms DRS transmission window set at a minimum of 40ms period units, the total duration of transmissions including DRS that satisfy the condition of a duty cycle of 1 / 20 or less may be 2ms or less. The base station can perform multiple DRS transmissions, each with a duration of 1ms or less, under the constraint of a total transmission duration of 2ms or less including DRS. In this case, the base station can perform a second-type channel access before performing each of the multiple transmissions. With such an embodiment, the base station can quickly transmit DRS to the terminal. Also, if the DRS transmission period is set to 80ms or more, and the base station transmits DRS within a 5ms DRS transmission window set at a minimum of 80ms period units, the total duration of transmissions including DRS that satisfy the condition of a duty cycle of 1 / 20 or less including DRS may be 4ms or less. The base station can perform multiple DRS transmissions, each with a duration of 1ms or less, under the constraint of a total transmission duration of 4ms or less including DRS.In this case, the base station can perform a second-type channel access before each of the multiple transmissions. 【0151】 Furthermore, if the total duration of the transmission including DRS is greater than 1 ms and the duty cycle of the DRS transmission is greater than 1 / 20, the base station may perform channel access for the transmission including DRS using variable-size CW with random backoff, where the size of the CW is determined by the channel access priority class. In this case, the channel access method may be a first-type channel access. 【0152】 In other specific embodiments, a portion of a transmission including DRS may have a transmission duty cycle of 1 / 20 or less. In this case, the base station can perform channel access with only single-time-interval-based LBT for a portion of the transmission portion of the transmission including DRS that has a duty cycle of 1 / 20 or less. In such embodiments, the base station can perform multiple transmissions, each with a duration of 1 ms or less, and perform channel access with only single-time-interval-based LBT for each of the multiple transmissions. In this case, channel access with only single-time-interval-based LBT may be a second-type channel access. Furthermore, the base station can perform channel access with random backoff using variable-size CW for the remaining transmission portion of the transmission including DRS, where the size of the CW is determined by the channel access priority class. In this case, channel access with random backoff using variable-size CW and where the size of the CW is determined by the channel access priority class may be a first-type channel access. For example, the period of the DRS transmission may be a multiple of 20 ms. Specifically, when the DRS transmission period is 20ms, the duration of the transmission section where the DRS transmission duty cycle is 1 / 20 or less is 1ms. When the DRS transmission period is 40ms, the duration of the transmission section where the DRS transmission duty cycle is 1 / 20 or less is 2ms. When the DRS transmission period is 60ms, the duration of the transmission section where the DRS transmission duty cycle is 1 / 20 or less is 3ms. When the DRS transmission period is 80ms, the duration of the transmission section where the DRS transmission duty cycle is 1 / 20 or less is 4ms. In this case, the base station can perform Type 2 channel access for a portion of the transmission section of the transmission containing DRS with a duty cycle of 1 / 20, and Type 1 channel access for the remaining transmission section of the transmission containing DRS. 【0153】 The maximum number of SSBs that can be included in a DRS may be 8. In the following explanation, we will assume that the number of SSBs included in the DRS is 8. When the period of DRS transmission is 20ms, the duration of a transmission section in which the duty cycle of the DRS transmission is 1 / 20 or less is 1ms. Therefore, when the subcarrier spacing is 15KHz, a transmission section in which the duty cycle of the DRS transmission is 1 / 20 or less may contain 2 SSBs. In this case, the base station can perform a second-type channel access before the first transmission, and if the channel access is successful, it can transmit 2 SSBs. Also, the base station can perform a first-type channel access before the second transmission, and if the channel access is successful, it can transmit 6 SSBs. Furthermore, when the period of DRS transmission is 20ms, the duration of a transmission section in which the duty cycle of the DRS transmission is 1 / 20 or less is 1ms. Therefore, when the subcarrier spacing is 30KHz, a transmission section in which the duty cycle of the DRS transmission is 1 / 20 or less may contain 4 SSBs. In this case, the base station can perform a Type 2 channel access before the first transmission, and if the channel access is successful, it can transmit four SSBs. Furthermore, the base station can perform a Type 1 channel access before the second transmission, and if the channel access is successful, it can transmit four SSBs. 【0154】 When the DRS transmission period is 40ms, the duration of a transmission segment where the DRS transmission duty cycle is 1 / 20 or less is 2ms. Therefore, when the subcarrier spacing is 15KHz, a transmission segment where the DRS transmission duty cycle is 1 / 20 or less may contain 4 SSBs. In this case, the base station can perform two transmissions with a duration of 1ms, transmitting 2 SSBs with each transmission. The base station can perform a Type 2 channel access before the first transmission, and if the channel access is successful, transmit 2 SSBs. Furthermore, the base station can perform a Type 2 channel access before the second transmission, and if the channel access is successful, transmit 2 SSBs. Finally, the base station can perform a Type 1 channel access before the third transmission, and if the channel access is successful, transmit the remaining 4 SSBs. Furthermore, when the DRS transmission period is 40ms, the duration of a transmission section where the DRS transmission duty cycle is 1 / 20 or less is 2ms. Therefore, when the subcarrier spacing is 30KHz, a transmission section where the DRS transmission duty cycle is 1 / 20 or less may contain 8 SSBs. In this case, the base station can perform a second-type channel access before the first transmission, and if the channel access is successful, it can transmit 4 SSBs. Also, the base station can perform a second-type channel access before the second transmission, and if the channel access is successful, it can transmit 4 SSBs. 【0155】 In further specific embodiments, a portion of the transmission including DRS may have a duration of 1 ms or less, and the DRS transmission duty cycle may be 1 / 20 or less. In this case, the base station can perform channel access where only single-time-interval-based LBT is performed for a portion of the transmission including DRS having a duty cycle of 1 / 20 or less and a duration of 1 ms or less. In this case, channel access where only single-time-interval-based LBT is performed may be a second-type channel access. The base station can also perform channel access where random backoff is performed using variable-size CW for the remaining transmission portion, and the size of the CW is determined by the channel access priority class. In this case, channel access where random backoff is performed using variable-size CW and the size of the CW is determined by the channel access priority class may be a first-type channel access. 【0156】 The maximum number of SSBs that can be included in a DRS may be 8. The following explanation assumes that the number of SSBs included in the DRS is 8. 【0157】 When the DRS transmission period is 20ms, the duration of a transmission segment where the DRS transmission duty cycle is 1 / 20 or less is 1ms. Therefore, when the subcarrier spacing is 15KHz, a transmission segment where the DRS transmission duty cycle is 1 / 20 or less may contain 2 SSBs. In this case, the base station can perform a Type 2 channel access before the first transmission, and if the channel access is successful, it can transmit 2 SSBs. Also, the base station can perform a Type 1 channel access before the second transmission, and if the channel access is successful, it can transmit 6 SSBs. Furthermore, when the DRS transmission period is 20ms, the duration of a transmission segment where the DRS transmission duty cycle is 1 / 20 or less is 1ms. Therefore, when the subcarrier spacing is 30KHz, a transmission segment where the DRS transmission duty cycle is 1 / 20 or less may contain 4 SSBs. In this case, the base station can perform a Type 2 channel access before the first transmission, and if the channel access is successful, it can transmit 4 SSBs. Furthermore, the base station can perform a first-type channel access before the second transmission, and if the channel access is successful, it can transmit four SSBs. 【0158】 When the DRS transmission period is 40ms, the duration of a transmission segment where the DRS transmission duty cycle is 1 / 20 or less is 2ms. When the subcarrier spacing is 15KHz, a transmission segment with a duration of 1ms and a DRS transmission duty cycle of 1 / 20 or less may contain 2 SSBs. The base station can perform a second-type channel access before the first transmission, and if the channel access is successful, it can transmit 2 SSBs. The base station can also perform a first-type channel access before the second transmission, and if the channel access is successful, it can transmit the remaining 6 SSBs. Furthermore, when the DRS transmission period is 40ms, the duration of a transmission segment where the DRS transmission duty cycle is 1 / 20 or less is 2ms. When the subcarrier spacing is 30KHz, a transmission segment with a duration of 1ms and a DRS transmission duty cycle of 1 / 20 or less may contain 4 SSBs. In this case, the base station can perform a Type 2 channel access before the first transmission, and if the channel access is successful, it can transmit four SSBs. Furthermore, the base station can perform a Type 1 channel access before the second transmission, and if the channel access is successful, it can transmit four SSBs. 【0159】 Also, the DRS transmission window duration is T msIt may be set as follows. In this case, T may be a natural number greater than or equal to 1. T may be 5 or 6. Alternatively, T may be set to a multiple of the smallest time interval in which the maximum possible number of SSBs included in the DRS can be included. When the duration of the DRS transmission window is 1 ms or more, the base station may perform channel access with only single-time interval-based LBT in the last 1 ms of the DRS transmission window. In this case, when the DRS transmission duty cycle in the last 1 ms of the DRS transmission window is 1 / 20 or less, the base station may perform channel access with only single-time interval-based LBT in the last 1 ms of the DRS transmission window. Channel access with only single-time interval-based LBT may be the second type channel access described above. In addition, the base station may perform first-type channel access or second-type channel access in the last 1 ms of the DRS transmission window. With such an embodiment, the terminal can quickly perform initial connection and RRM measurement. 【0160】 The following describes the LBT procedure used when a wireless communication device according to an embodiment of the present invention performs channel access in an unlicensed band. In particular, the wireless communication device may be configured to perform channel access based on the results of channel sensing within a predetermined time interval. In this case, the operation method of the wireless communication device will be described when the wireless communication device fails to perform channel access. The predetermined duration may be 16us. 【0161】 For the sake of explanation, a radio communication device that initiates channel occupancy is referred to as the initiating node. A radio communication device that communicates with the initiating node is referred to as the responding node. The initiating node may be a base station and the responding node a terminal. Alternatively, the initiating node may be a terminal and the responding node a base station. When the initiating node attempts to transmit data, it can access the channel according to a channel access priority class determined by the data type. The parameters used for channel access may be determined by the data type. These parameters include the minimum CW value, the maximum CW value, the maximum occupancy time (MCOT), which is the maximum duration for which the channel can be occupied in a single channel occupancy, and the number of sensing slots (m p ) may include at least one of the following. Specifically, the starting node can perform the aforementioned Category 4 LBT by channel access priority class determined by the data type. 【0162】 Table 4 below shows an example of the parameter values ​​used for channel access depending on the channel access priority class. Specifically, Table 4 shows the parameter values ​​used for channel access for downlink transmission in the LTE LAA system, categorized by channel access priority class. 【0163】 When a downlink channel transmitted by a wireless communication device contains data traffic, the defer duration may be set by the channel access priority class of the traffic contained in the downlink channel. The defer duration is also set by the initial interval (T f ) one or more (m p ) slot section (T sl ) can include the slot interval (T slThe duration of ) may be 9us. The initial interval is one idle slot interval (T sl ) is included. Also, the number of slot intervals included in the defer period (m p ) may be set by the channel access priority class as described above. Specifically, the number of slot intervals included in the defer period (m p The values ​​may be set as shown in Table 4. 【0164】 [Table 4] 【0165】 Furthermore, the wireless communication device can set the range of CW values ​​according to the channel access priority class. Specifically, the wireless communication device can set the range of CW min,p <=CW<=CW max,p The CW value can be set to satisfy the following conditions. In this case, the minimum value of CW (CW min,p ) and maximum value (CW max,p ) may be determined by the channel access priority class. Specifically, the minimum value for CW (CW min,p ) and maximum value (CW max,p The minimum value of CW (CW) may be determined as shown in Table 4. The radio communication device sets the minimum value of CW in the counter value setting procedure. min,p ) and maximum value (CW max,p ) can be set. When the radio communication device accesses a channel, the radio communication device can adjust the CW value. In addition, the radio communication device can set MCOT(T) in the unlicensed band. mcot,p) may be determined by the channel access priority of the data included in the transmission, as mentioned above. Specifically, MCOT may be determined as shown in Table 4. As a result, radio communication devices may not be permitted to transmit continuously for a time exceeding MCOT in the unlicensed band. The unlicensed band is a frequency band used by various radio communication devices according to certain rules. In Table 4, if the channel access priority class value is p=3 or p=4, and there are no radio communication devices using the unlicensed band for a long term according to the regulations and using other technology, then the radio communication device T mcot,p It can be set to =10ms. Otherwise, the wireless communication device will T mcot,p It can be set to =8ms. 【0166】 Figure 14 is a block diagram showing the configurations of a terminal and a base station according to one embodiment of the present invention. 【0167】 In one embodiment of the present invention, the terminal is embodied in various types of wireless communication devices or computing devices that ensure portability and mobility. The terminal is referred to as UE, STA (Station), MS (Mobile Subscriber), etc. In another embodiment of the present invention, the base station controls and manages the cells (e.g., macrocells, femtocells, picocells, etc.) in the service area and performs functions such as signal transmission, channel assignment, channel monitoring, self-diagnosis, and relaying. The base station is referred to as gNB (next Generation NodeB) or AP (Access Point), etc. 【0168】 As shown in the figure, a terminal 100 according to one embodiment of the present invention includes a processor 110, a communication module 120, a memory 130, a user interface unit 140, and a display unit 150. 【0169】 First, the processor 110 executes various instructions or programs to process data inside the terminal 100. The processor 110 also controls the overall operation of the terminal 100, including each unit, and controls the transmission and reception of data between units. Here, the processor 110 is configured to perform the operations described in the embodiment of the present invention. For example, the processor 110 may receive slot configuration information, determine the slot configuration based on that information, and perform communication according to the determined slot configuration. 【0170】 Next, the communication module 120 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 120 incorporates multiple network interface cards (NICs), such as cellular communication interface cards 121 and 122 and an unlicensed band communication interface card 123, either internally or externally. In the drawing, the communication module 120 is shown as an integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawing. 【0171】 The cellular communication interface card 121 transmits and receives radio signals to and from at least one of the base station 200, an external device, and a server via a mobile communication network, and provides cellular communication services in a first frequency band based on instructions from the processor 110. According to one embodiment, the cellular communication interface card 121 includes at least one NIC module that utilizes a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 121 independently performs cellular communication with at least one of the base station 200, an external device, and a server, depending on the cellular communication standard or protocol of the sub-6 GHz frequency band supported by the NIC module. 【0172】 The cellular communication interface card 122 uses a mobile communication network to send and receive radio signals with at least one of the base station 200, an external device, or a server, and provides cellular communication services in the second frequency band based on instructions from the processor 110. In one embodiment, the cellular communication interface card 122 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 122 independently performs cellular communication with at least one of the base station 200, an external device, or a server, according to the cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the NIC module. 【0173】 The unlicensed band communication interface card 123 transmits and receives radio signals to and from at least one of the base station 200, an external device, or a server via the third frequency band, which is an unlicensed band, and provides communication services in the unlicensed band based on instructions from the processor 110. The unlicensed band communication interface card 123 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be a band of 2.4GHz, 5GHz, 6GHz, 7GHz, or 52.6GHz or higher. At least one NIC module of the unlicensed band communication interface card 123 independently or dependently performs cellular communication with at least one of the base station 200, an external device, or a server, depending on the unlicensed band communication standard or protocol of the frequency band supported by the NIC module. 【0174】 Next, the memory 130 stores control programs used by the terminal 100 and various data associated with them. Such control programs include predetermined programs necessary for the terminal 100 to communicate wirelessly with at least one of the following: a base station 200, an external device, or a server. 【0175】 Next, the user interface 140 includes various forms of input / output means provided in the terminal 100. In other words, the user interface unit 140 receives user input using various input means, and the processor 110 controls the terminal 100 based on the received user input. The user interface 140 also outputs based on instructions from the processor 110 using various output means. 【0176】 Next, the display unit 150 outputs various images to the display screen. The display unit 150 outputs various display objects, such as content generated by the processor 110 or user interfaces based on control instructions from the processor 110. 【0177】 Furthermore, the base station 200 according to the embodiment of the present invention includes a processor 210, a communication module 220, and a memory 230. 【0178】 First, the processor 210 executes various instructions or programs to process data within the base station 200. The processor 210 also controls the overall operation of the base station 200, including each unit, and controls the transmission and reception of data between units. Here, the processor 210 is configured to perform the operations described in the embodiment of the present invention. For example, the processor 210 may signal slot configuration information and perform communication according to the signaled slot configuration. 【0179】 Next, the communication module 220 is an integrated module that performs wireless communication using a wireless communication network and wireless LAN access using a wireless LAN. To this end, the communication module 220 incorporates multiple network interface cards, such as cellular communication interface cards 221 and 222, and an unlicensed band communication interface card 223, either internally or externally. In the drawings, the communication module 220 is shown as an integrated module, but each network interface card may be arranged independently depending on the circuit configuration or application, contrary to the drawings. 【0180】 The cellular communication interface card 221 transmits and receives wireless signals to and from at least one of the terminal 100, external devices, and servers described above using a mobile communication network, and provides cellular communication services in the first frequency band based on instructions from the processor 210. According to one embodiment, the cellular communication interface card 221 includes at least one NIC module that utilizes a frequency band of less than 6 GHz. At least one NIC module of the cellular communication interface card 221 independently performs cellular communication with at least one of the terminal 100, external devices, and servers, according to the cellular communication standard or protocol of the frequency band of less than 6 GHz supported by the NIC module. 【0181】 The cellular communication interface card 222 uses a mobile communication network to send and receive wireless signals to and from at least one of the terminal 100, an external device, and a server, and provides cellular communication services in the second frequency band based on instructions from the processor 210. In one embodiment, the cellular communication interface card 222 includes at least one NIC module that utilizes a frequency band of 6 GHz or higher. At least one NIC module of the cellular communication interface card 222 independently performs cellular communication with at least one of the terminal 100, an external device, and a server, according to the cellular communication standard or protocol of the 6 GHz or higher frequency band supported by the NIC module. 【0182】 The unlicensed band communication interface card 223 uses the third frequency band, which is an unlicensed band, to send and receive wireless signals with at least one of the terminal 100, an external device, or a server, and provides communication services in the unlicensed band based on instructions from the processor 210. The unlicensed band communication interface card 223 includes at least one NIC module that utilizes the unlicensed band. For example, the unlicensed band may be 2.4GHz, 5GHz, 6GHz, 7GHz, or a band of 52.6GHz or higher. At least one NIC module of the unlicensed band communication interface card 223 independently or dependently performs cellular communication with at least one of the terminal 100, an external device, or a server, depending on the unlicensed band communication standard or protocol of the frequency band supported by the NIC module. 【0183】 The terminal 100 and base station 200 shown in Figure 14 are block diagrams according to one embodiment of the present invention, and the separately shown blocks logically distinguish the elements of the device. Therefore, the above-mentioned elements of the device are mounted on one or more chips depending on the device design. In addition, some components of the terminal 100, such as the user interface unit 150 and the display unit 150, may be selectively provided in the terminal 100. Furthermore, the user interface 140 and the display unit 150, etc., may be additionally provided in the base station 200 as needed. 【0184】 Figure 15 shows a downlink channel access procedure according to one embodiment of the present invention. 【0185】 Figure 15 shows the downlink channel access procedure used when a terminal initiates Channel Occupancy Time (COT) sharing (UE-initiated COT sharing). Figure 15(a) shows an example of the downlink channel access procedure when the gap is less than 16us, Figure 15(b) shows an example of the downlink channel access procedure when the gap is 16us, and Figure 15(c) shows an example of the downlink channel access procedure when the gap is 25us. 【0186】 To perform an uplink (e.g., push) transmission on a scheduled or configured resource, a terminal can use a Category 4 channel access procedure to obtain its own initiated channel occupancy. The terminal can then share the channel occupancy with the base station for base station transmission. 【0187】 If information regarding the Energy Detection (ED) threshold is set 【0188】 The terminal can receive an Energy Detection (ED) threshold applied when acquiring channel access from the base station. For example, the base station can configure the ED threshold by sending the terminal 'ULtoDL-CO-SharingED-Threshold-r16' as an RRC parameter for the ED threshold. When the terminal shares channel access with the base station, the base station can transmit a specific channel or a specific signal. In this case, the uplink transmission may be a configured grant (CG)-PUSCH or a scheduled uplink transmission (e.g., a scheduled grant-PUSCH). The base station may perform a downlink transmission after the terminal's uplink transmission. In this specification, a CG uplink transmission (e.g., CG-PUSCH) may be an uplink transmission (e.g., CG-PUSCH) performed by the terminal on a semi-statically configured resource for uplink transmission provided by the base station. 【0189】 When an uplink transmission performed by a terminal is CG-PUSCH, the terminal can receive a table from the base station for sharing channel occupancy. Specifically, the terminal may receive a table from the base station for sharing information related to channel occupancy between the base station and the terminal (e.g., channel occupancy time (COT)), which may be configured by the RRC parameter 'COT-SharingList-r16'. The terminal can also receive channel occupancy information corresponding to each row of the table from the base station. For example, the channel occupancy information corresponding to each row of the table may be provided by the RRC parameter 'cg-COT-Sharing-r16'. In this case, one of the rows of the table may be configured to indicate that channel occupancy is not shared. When a terminal shares its initiated channel occupancy with the base station in order to perform a CG-PUSCH transmission, the terminal can indicate a row index corresponding to a single row in a table set up by the base station using the 'COT sharing information' included in the CG-UCI (Uplink control information) of the CG-PUSCH. That is, when the terminal indicates an index corresponding to a single row providing channel occupancy information, the base station can perform a downlink transmission by assuming one or more values ​​corresponding to the channel occupancy information indicated by the row in the table indicated by the index. Specifically, the channel occupancy information may include duration, offset, CAPC, etc. Duration can mean the number of slots available (assumed) for downlink transmission within the channel occupancy time initiated by the terminal. Offset means the time interval (difference) from the end of the slot in which the base station detected the CG-UCI to the slot in which the base station's downlink transmission begins. CAPC means the CAPC assumed when the terminal shares its initiated channel occupancy with the base station. 【0190】 If information regarding the Energy Detection (ED) threshold is not set. 【0191】 There may be cases where the base station does not set the ED threshold for the terminal. In other words, there may be cases where the terminal does not receive the ED threshold from the base station. That is, the base station does not need to configure the terminal to set the ED threshold by not configuring 'ULtoDL-CO-SharingED-Threshold-r16' as an RRC parameter for the ED threshold. In this case, if the uplink transmission performed by the terminal is CG-PUSCH, the CG-UCI of CG-PUSCH may include 'COT sharing information' indicating whether or not channel occupancy is shared. If the terminal indicates that channel occupancy is shared using the CG-UCI (for example, if the value of COT sharing information is 1), the terminal may accept X symbols set by the base station as for the downlink transmission performed by the base station. Specifically, the terminal may receive the RRC parameter 'cg-COT-SharingOffset-r16' from the base station indicating X symbols for downlink transmission, and the base station may accept X symbols as shared channel occupancy initiated by the terminal for downlink transmission. In this case, X symbols represent the last X symbols of slot n (slot #n) where the base station detected the CG-UCI. 【0192】 In this case, the base station may transmit downlink after the terminal's uplink, but the length of the downlink transmission may be limited to a maximum of 2 symbols, 4 symbols, or 8 symbols, depending on the subcarrier interval. For example, if the subcarrier interval is 15 kHz, the downlink transmission may be limited to a maximum of 2 symbols; if the subcarrier interval is 30 kHz, the downlink transmission may be limited to a maximum of 4 symbols; and if the subcarrier interval is 60 kHz, the downlink transmission may be limited to a maximum of 8 symbols. 【0193】 The following describes the downlink transmission performed by the base station after the uplink transmission by the terminal. In this case, the downlink transmission performed by the base station may be applicable whether or not the base station has transmitted (configured) RRC parameters for the ED threshold to the terminal. 【0194】 i) When the base station configures the ED threshold on a terminal by configuring 'ULtoDL-CO-SharingED-Threshold-r16' as the RRC parameter for the ED threshold, the base station may perform a downlink transmission consisting only of DRS after the terminal has performed an uplink transmission (e.g., PUSCH) on a scheduled or configured resource. The DRS in this specification may include at least one SSB comprising a PSS (Primary synchronization signal), an SSS (Secondary synchronization signal), a PBCH (Physical broadcast channel), and a DM-RS for the PBCH. The DRS may also include a CORESET for a PDSCH that transmits a SIB1 (System information block 1) and a PDCCH that schedules it. The DRS may also include non-zero power CSI reference signals. 【0195】 On the other hand, if the base station does not configure 'ULtoDL-CO-SharingED-Threshold-r16' as an RRC parameter for the ED threshold on the terminal, and therefore the ED threshold is not configured, downlink transmission including only DRS may be performed only if the subcarrier spacing is 30 kHz or more. This is because the minimum number of symbols occupied by SSB included in DRS is 4. 【0196】 ii) After a terminal has made an uplink transmission (e.g., a push) on a scheduled or configured resource, the base station may make a downlink transmission including a DRS. In this case, the base station's downlink transmission may be multiplexed with non-unicast transmissions for any terminal. 【0197】 iii) After a terminal has made an uplink (e.g., push) transmission on a scheduled or configured resource, the base station may make a downlink transmission. The downlink transmission made by the base station may include a reference signal for the terminal that initiated channel occupancy (e.g., CSI-RS, Tracking RS, etc.) and a non-unicast transmission for any terminal. 【0198】 iv) After a terminal has made an uplink (e.g., push) transmission on a scheduled or configured resource, the base station may make a downlink transmission. In this case, the downlink transmission made by the base station may not include user plane data for the terminal that initiated channel occupancy, but may include a unicast transmission containing control plane data (e.g., data for RRC configuration) and a non-unicast transmission for any terminal. 【0199】 When the channel occupancy initiated by the terminal is shared with the base station, after the terminal's uplink transmission, the base station can perform channel access using a gap smaller than or based on a specific gap, and then perform the downlink transmissions described in i) to iv) above. The base station's channel access procedure is described below. 【0200】 If the gap is less than 16us, the base station can perform a Type 2C downlink channel access procedure before transmitting downlink. The Type 2C downlink channel access procedure means that the base station transmits downlink without performing channel sensing beforehand. The duration for downlink transmission may be limited to a maximum of 584us. (See 3GPP TS 37.213) 【0201】 [Table 5] 【0202】 If the gap is 16us, the base station can perform a Type 2B downlink channel access procedure before performing a downlink transmit. The Type 2B downlink channel access procedure means that the base station senses whether the channel is idle within a 16us (T_f) interval before immediately performing a downlink transmit. The 16us (T_f) interval may include one sensing slot within the last 9us. If the channel is sensed to be idle during the entire interval (e.g., at least 5us) including the interval in which sensing takes place in the sensing slot (e.g., at least 4us), the channel may be considered idle. (See 3GPP TS 37.213) 【0203】 [Table 6] 【0204】 If the gap is 25us, the base station can perform a Type 2A downlink channel access procedure before performing a downlink transmit. The Type 2A downlink channel access procedure means that the base station senses whether the channel is idle during a 25us (T_short_dl) sensing interval before immediately performing a downlink transmit. The 25us (T_short_dl) sensing interval may consist of a 16us (T_f) interval and one sensing slot (9us) immediately following the 16us (T_f) interval. The 16us (T_f) interval may contain one sensing slot (9us). If the 25us (T_short_dl) sensing interval (i.e., all sensing slots) is sensed to be idle, the channel may be considered idle during the 25us (T_short_dl) interval. (See 3GPP TS 37.213) 【0205】 [Table 7] 【0206】 Figure 16 shows a scheduling uplink transmission according to one embodiment of the present invention. 【0207】 Specifically, Figure 16 illustrates the scheduled uplink transmission performed by a terminal when it is scheduled to perform consecutive, gap-free uplink transmissions after a resource configured for autonomous transmission or CG-PUSCH from the base station. 【0208】 When a terminal is configured to perform the scheduled uplink transmission, the terminal may perform the scheduled uplink transmission without channel access if the following conditions are met: Uplink transmissions on resources configured for autonomous transmission or CG-PUSCH may be dropped at the last symbol of a slot prior to the start of the scheduled uplink transmission slot (e.g., the nth slot) (e.g., the (n-1)th slot). 【0209】 The following describes the conditions under which a terminal can perform scheduled uplink transmissions without channel access. 【0210】 a) The terminal must perform Category 4 channel access (e.g., Type 1 uplink channel access) for uplink transmission on a resource configured for autonomous transmission or CG-PUSCH. The terminal must perform uplink transmission on a resource configured for autonomous transmission or CG-PUSCH before the start of the scheduled uplink transmission slot. 【0211】 b) The frequency domain resources for scheduled uplink transmission must be scheduled to occupy all resource blocks (RBs) of the LBT bandwidth (e.g., 20 MHz) that the first scheduled slot can occupy from the time domain resources set up for scheduled uplink transmission. Alternatively, all RBs of the uplink bandwidth part (BWP) set up on the terminal must be scheduled. In this case, the start symbol index of the first scheduled slot from the time domain resources set up for CG-PUSCH may be 0. Alternatively, there may be multiple LBT bandwidths within a single BWP. In this case, if resources for autonomous transmission or resources set up for CG-PUSCH are allocated to one or more LBT bandwidths within a single BWP, the frequency domain resources for scheduled uplink transmission may occupy all RBs of one subset of the one or more LBT bandwidths, or all RBs of all LBT bandwidths that include resources for autonomous transmission or resources set up for CG-PUSCH. 【0212】 c) When a terminal makes Category 4 channel access (e.g., Type 1 uplink channel access) for uplink transmission on a resource configured for autonomous transmission or CG-PUSCH, the CAPC used must be greater than or equal to the CAPC instructed by the base station for scheduled uplink transmission. 【0213】 d) The sum of the length of uplink transmissions on resources configured for autonomous transmission or CG-PUSCH and the length of scheduled uplink transmissions shall not exceed the Maximum Channel Occupancy Time (MCOT). In this case, the MCOT is the MCOT set when the terminal performs Category 4 channel access (e.g., Type 1 uplink channel access) for uplink transmissions on resources configured for autonomous transmission or CG-PUSCH. 【0214】 If all of the above conditions a) to d) are not met, the terminal may interrupt an uplink transmission on a resource configured for autonomous transmission or CG-PUSCH at the last symbol of a slot prior to the start of a scheduled uplink transmission slot (e.g., the nth slot) (e.g., the (n-1)th slot). Alternatively, the terminal may interrupt an uplink transmission on a resource configured for autonomous transmission or CG-PUSCH at least one slot prior to the start of a scheduled uplink transmission slot (e.g., the nth slot) (e.g., the (n-1)th slot). On the other hand, if the time during which uplink transmission can be interrupted (the time during which cancellation is guaranteed) has not elapsed, the terminal may interrupt an uplink transmission on a resource configured for autonomous transmission or CG-PUSCH at least one slot prior to the start of a scheduled uplink transmission slot (e.g., the nth slot) (e.g., the (n-1)th slot). However, if the time limit for interrupting uplink transmission has elapsed, the terminal may perform the scheduled uplink transmission in the next slot (e.g., the (n+1)th slot) after the start of the scheduled uplink transmission slot (e.g., the nth slot). In this case, the channel access procedure for performing the scheduled uplink transmission in the next slot (e.g., the (n+1)th slot) may be a Category 4 channel access (e.g., a Type 1 uplink channel access). Alternatively, if the resources for the scheduled uplink transmission are included in the MCOT configured when the terminal performs a Category 4 channel access (e.g., a Type 1 uplink channel access) for an uplink transmission using resources configured for autonomous transmission or CG-PUSCH, the terminal may perform the scheduled uplink transmission based on a Category 2 channel access (e.g., a Type 2A uplink channel access) procedure. 【0215】 When an uplink transmission is scheduled from the base station without a gap following a resource configured for autonomous transmission or CG-PUSCH on the terminal, the terminal can perform the scheduled uplink transmission without channel access, depending on the type of scheduled uplink transmission. Possible types of scheduled uplink transmissions include PUSCH with UL-SCH (uplink-shared channel), PUSCH without UL-SCH, PUCCH which transmits uplink control information, uplink transmission associated with random access procedures (e.g., PRACH preamble, Msg3), and SRS (Sounding reference signal). In this case, PUCCH may include HARQ-ACK, SR (Scheduling Request), BFR (Beam-failure recovery request), or Channel State Information (CSI). 【0216】 If the conditions a) to d) described above are met, the terminal can perform scheduled uplink transmissions without channel access (e.g., LBT), regardless of the type of scheduled uplink transmission. 【0217】 If the scheduled uplink transmission is an uplink transmission other than a PUSCH transmission and satisfies the conditions a), c), and d) described above, the terminal can perform the scheduled uplink transmission without channel access. 【0218】 If the scheduled uplink transmission is an uplink transmission other than PUSCH, including UL-SCH, and satisfies the conditions a), c), and d) described above, the terminal can perform the scheduled uplink transmission without channel access. 【0219】 A scheduled uplink transmission may be a PUCCH containing at least one of HARQ-ACK, SR, or BFR. In this case, if the RRC configures interlaced-PUCCH transmission for PUCCH transmission and the PUCCH transmission is scheduled spread across the LBT bandwidth, and the conditions a), c), and d) described above are met, the terminal can perform the scheduled PUCCH transmission without channel access. A PUCCH containing at least one of HARQ-ACK, SR, or BFR is used to ensure transmission on the scheduled resource as much as possible, because failure of the channel access procedure can reduce the data transmission rate of uplink / downlink transmissions or significantly increase latency due to link failure. In addition, the CAPC used for PUCCH transmission may generally be set to 1. Therefore, the CAPC used for PUCCH transmission can always be smaller than or the same as the CAPC used when the terminal performs Category 4 channel access for uplink transmission on a resource configured for autonomous transmission or CG-PUSCH (e.g., Type 1 uplink channel access), thus satisfying condition c) above. 【0220】 If the scheduled uplink transmission is an SRS transmission without PUSCH, a PUCCH transmission without UL-SCH, and a transmission associated with a random access procedure (e.g., PRACH preamble, Msg3), then the terminal can perform the scheduled uplink transmission without performing a channel access procedure if the conditions a), c), and d) described above are met. In this case, a Category 4 channel access procedure (e.g., Type 1 uplink channel access) may be performed for an SRS transmission without PUSCH, a PUCCH transmission without UL-SCH, and a transmission associated with a random access procedure (e.g., PRACH preamble, Msg3), in which case CAPC may be set to 1. 【0221】 Figure 17 is a flowchart showing how a terminal according to one embodiment of the present invention receives a downlink transmission. 【0222】 Using Figure 17, we will explain how the aforementioned terminal receives the downlink transmission. 【0223】 First, the terminal transmits an uplink transmission to the base station that is associated with channel occupancy to be shared between the base station and the terminal (S1710). 【0224】 The terminal receives the downlink transmission that occurs after a gap from the time the base station receives the uplink transmission (S1720). 【0225】 The downlink transmission is performed based on channel access performed by the base station, and the channel access may be performed based on the gap. 【0226】 The information included in the downlink transmission and the resources on which the downlink transmission is performed may be determined based on whether or not an energy detection threshold for channel occupancy has been configured on the terminal by the base station. 【0227】 In this case, the gap may be less than 16us, 16us, or 25us. When the gap is less than 16us, the channel access may be a channel access that performs downlink transmission without channel sensing, i.e., the Type 2C downlink channel access described above. When the gap is 16us, the gap may include one sensing slot in the last 9us, and the channel access may perform downlink transmission when the sensing slot is idle, i.e., the Type 2B downlink channel access described above. When the gap is 25us, the gap may consist of a first section of 16us length including a first sensing slot of 9us length and a second section of 9us length which is a second sensing slot, and the channel access may be a channel access that performs downlink transmission when the first and second sensing slots are idle, i.e., the Type 2A downlink channel access described above. If the terminal is configured by the base station to set an energy detection threshold for channel occupancy, the information included in the downlink transmission may include at least one of the following: a unicast transmission for the terminal that initiated the channel occupancy and a non-unicast transmission for any terminal. On the other hand, if the terminal is not configured by the base station to set an energy detection threshold for channel occupancy, the information included in the downlink transmission excludes unicast transmissions, and the maximum number of symbols for the resources for which the downlink transmission is performed within the channel occupancy interval may be any one of 2, 4, or 8. When the subcarrier spacing (SCS) is 15 kHz, the resources for which the downlink transmission is performed within the channel occupancy interval may be a maximum of 2 symbols.When the SCS is 30 kHz, the resources for which the downlink transmission is performed within the channel occupied section may be a maximum of 4 symbols. When the SCS is 60 kHz, the resources for which the downlink transmission is performed within the channel occupied section may be a maximum of 8 symbols. 【0228】 The uplink transmission performed by the terminal may be a configured grant (CG)-physical uplink shared channel (PUSCH) performed on a resource already semi-statically configured by the base station. In this case, if the terminal has configured an energy detection threshold for channel occupancy from the base station, the terminal may have information about a table from the base station that includes values ​​set for each of the one or more parameters for channel occupancy and one or more indices corresponding to those set values. The CG-PUSCH may include CG-uplink control information (UCI) that indicates a first index among the one or more indices. The downlink transmission may be performed based on the values ​​set for each of the one or more parameters corresponding to the first index. The one or more parameters may be at least one of channel access priority (CAPC), duration, and offset. The CAPC is the CAPC used for channel occupancy initiated by the terminal, the duration is the number of slots available (or hypothetical) for downlink transmission within the channel occupancy time initiated by the terminal, and the offset can mean the difference from the last slot in which the base station detected the CG-UCI to the slot in which downlink transmission begins. On the other hand, if the terminal has not configured an energy detection threshold for channel occupancy from the base station, the terminal may receive an offset from the base station to indicate the resources (symbols) available (or acceptable for downlink transmission) for downlink transmission.The CG-PUSCH includes a CG-UCI containing information indicating that the channel can be occupied, and the downlink transmission may be performed on resources between resources located at an offset distance from the last resource in the slot where the base station detected the CG-UCI. In this case, unicast transmissions are excluded from the information included in the downlink transmission, and the maximum number of symbols of resources on which the downlink transmission is performed within the channel occupancy interval may be 2, 4, or 8. When the subcarrier spacing (SCS) is 15 kHz, the resources on which the downlink transmission is performed within the channel occupancy interval may be a maximum of 2 symbols. When the SCS is 30 kHz, the resources on which the downlink transmission is performed within the channel occupancy interval may be a maximum of 4 symbols. When the SCS is 60 kHz, the resources on which the downlink transmission is performed within the channel occupancy interval may be a maximum of 8 symbols. 【0229】 The terminal that performs the method of receiving downlink transmissions transmitted by a base station as described using Figure 17 may be the terminal described in Figure 14. Specifically, the terminal may be configured to include a communication module for transmitting and receiving radio signals and a processor for controlling the communication module. In this case, the method of receiving downlink transmissions as described in Figure 17 may be performed by the processor. Similarly, the base station may be the base station described in Figure 14. The base station may also be configured to include a communication module for transmitting and receiving radio signals and a processor for controlling the communication module. 【0230】 Figure 18 is a flowchart showing a method by which a terminal according to one embodiment of the present invention performs an uplink transmission. 【0231】 Using Figure 18, we will explain how the aforementioned terminal performs uplink transmission. 【0232】 The terminal performs a first transmission to the base station, which is a configured grant (CG) uplink transmission, on the first resource (S1810). 【0233】 In this case, the CG uplink transmission may be a transmission performed on a resource that has already been semi-statically configured by the base station. 【0234】 The terminal performs a second transmission, which is a scheduled uplink transmission, on the second resource to the base station (S1820). 【0235】 The first resource and the second resource may be contiguous with respect to each other in the time domain. 【0236】 If one or more previously set conditions are met, the second transmission may occur immediately after the last symbol of the first resource on the second resource. 【0237】 If one or more of the previously set conditions are not met, the first transmission may be interrupted (dropped) at the last symbol of the first resource. 【0238】 Any one of the one or more previously set conditions may be that the first transmission is performed based on channel access that performs random backoff using a variable-size contention window (CW), i.e., the Category 4 channel access described above. 【0239】 One of the one or more previously set conditions may be that the resources allocated for the second transmission occupy all resource blocks (RB) in the same frequency domain as the resources allocated for the first transmission. 【0240】 Any one of the one or more previously set conditions is that, when the bandwidth part (BWP), which is a frequency domain resource allocated for the first transmission, consists of multiple LBT (Listen Before Talk) bandwidth subsets, the resources allocated for the second transmission occupy all resource blocks (RB) included in one or more of the LBT bandwidth subsets. 【0241】 Any one of the one or more previously set conditions may be that the second transmission is performed based on a second CAPC value that is the same as or smaller than the first Channel Access Priority Class (CAPC) value used for the channel access. 【0242】 Any one of the one or more previously set conditions may be that the sum of the time domains of the first resource and the second resource does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value. 【0243】 The terminal performing the uplink transmission described using Figure 18 may be the terminal described in Figure 14. Specifically, the terminal may include a communication module for sending and receiving radio signals and a processor for controlling the communication module. In this case, the processor may perform the method for receiving the downlink transmission described in Figure 18. Similarly, the base station may be the base station described in Figure 14. The base station may also include a communication module for sending and receiving radio signals and a processor for controlling the communication module. 【0244】 Although the methods and systems of the present invention have been described in relation to specific embodiments, some or all of their components or operations may be embodied using a computing system having a general-purpose hardware architecture. 【0245】 The above description of the present invention is for illustrative purposes, and those with ordinary knowledge in the technical field to which the present invention pertains can understand that it can be easily transformed into other specific forms without changing the technical idea and essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented dispersedly, and similarly, components described as being dispersed may also be implemented in a combined form. 【0246】 The scope of the present invention is defined by the claims described below rather than the above detailed description, and any changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included within the scope of the present invention. 【Explanation of Reference Numerals】 【0247】 100 Terminal 110 Processor 120 Communication Module 130 Memory 140 User Interface Unit 150 Display Unit 200 Base Station 210 Processor 220 Communication Module 230 Memory

Claims

[Claim 1] A terminal for use in a wireless communication system, Communication module and The system includes a processor that controls the communication module, The aforementioned processor, This involves performing a configured grant (CG) uplink transmission on the first resource based on the channel access procedure, The aforementioned first resource is semi-statically composed of multiple LBT (Listen Before Talk) bandwidth sets within the Bandwidth Part (BWP), and the process is as follows: It is configured to perform scheduled uplink transmissions on a second resource within the BWP, If all conditions in the set of conditions are met, The scheduled uplink transmission is performed immediately after the last symbol of the CG uplink transmission on the second resource. If the set of conditions mentioned above is not met, The aforementioned CG uplink transmission is interrupted (dropped) before the start point of the second resource. The terminal is characterized in that the set of conditions includes a first condition which is satisfied when the second resource occupies all resource blocks (RBs) of a subset of the plurality of LBT bandwidth sets. [Claim 2] The terminal according to claim 1, characterized in that the processor is configured to perform the channel access procedure based on random backoff using a variable-size contention window (CW). [Claim 3] The terminal according to claim 2, wherein the set of conditions is further characterized by including a second condition which is satisfied when the first Channel Access Priority Class (CAPC) value of the channel access performed is greater than or equal to the second CAPC value corresponding to the scheduled uplink transmission. [Claim 4] The terminal according to claim 3, wherein the set of conditions is further characterized by including a third condition which is satisfied when the sum of the transmission duration of the first resource and the transmission duration of the second resource in the time domain does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value. [Claim 5] A method for use by a terminal in a wireless communication system, A step of performing a configured grant (CG) uplink transmission on a first resource based on a channel access procedure, The first resource is semi-statically composed of multiple LBT (Listen Before Talk) bandwidth sets within a Bandwidth Part (BWP), and the steps are as follows: The steps include performing a scheduled uplink transmission on a second resource within the BWP, If all conditions in the set of conditions are met, The scheduled uplink transmission is performed immediately after the last symbol of the CG uplink transmission on the second resource. If the set of conditions mentioned above is not met, The aforementioned CG uplink transmission is interrupted (dropped) before the start point of the second resource. The method is characterized in that the set of conditions includes a first condition which is satisfied when the second resource occupies all resource blocks (RBs) of a subset of the plurality of LBT bandwidth sets. [Claim 6] The method according to claim 5, characterized in that the channel access procedure is performed based on random backoff using a variable-size contention window (CW). [Claim 7] The method according to claim 6, wherein the set of conditions is further characterized by including a second condition which is satisfied when the first Channel Access Priority Class (CAPC) value of the channel access performed is greater than or equal to the second CAPC value corresponding to the scheduled uplink transmission. [Claim 8] The method according to claim 7, wherein the set of conditions further includes a third condition, which is satisfied when the sum of the transmission duration of the first resource and the transmission duration of the second resource in the time domain does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value. [Claim 9] A base station for use in a wireless communication system, Communication module and The system includes a processor that controls the communication module, The aforementioned processor, Receiving a configured grant (CG) uplink transmission sent on the first resource based on the channel access procedure, The aforementioned first resource is semi-statically composed of multiple LBT (Listen Before Talk) bandwidth sets within a Bandwidth Part (BWP), and is for receiving, It is configured to receive scheduled uplink transmissions sent on a second resource within the aforementioned BWP, If all conditions in the set of conditions are met, The scheduled uplink transmission is performed immediately after the last symbol of the CG uplink transmission on the second resource. If the set of conditions mentioned above is not met, The aforementioned CG uplink transmission is interrupted (dropped) before the start point of the second resource. The base station is characterized in that the set of conditions includes a first condition which is satisfied when the second resource occupies all resource blocks (RBs) of a subset of the plurality of LBT bandwidth sets. [Claim 10] The base station according to claim 9, characterized in that the channel access procedure is performed based on random backoff using a variable-size contention window (CW). [Claim 11] The base station according to claim 10, wherein the set of conditions is further characterized by including a second condition which is satisfied when the first Channel Access Priority Class (CAPC) value of the channel access performed is greater than or equal to the second CAPC value corresponding to the scheduled uplink transmission. [Claim 12] The base station according to claim 11, wherein the set of conditions is further characterized by including a third condition, which is satisfied when the sum of the transmit duration of the first resource and the transmit duration of the second resource in the time domain resource does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value. [Claim 13] A communication method for a base station in a wireless communication system, A step of receiving a configured grant (CG) uplink transmission sent on a first resource based on a channel access procedure, The first resource is semi-statically composed of multiple LBT (Listen Before Talk) bandwidth sets within a Bandwidth Part (BWP), and the steps are as follows: The step includes receiving a scheduled uplink transmission sent on a second resource within the BWP, If all conditions in the set of conditions are met, The scheduled uplink transmission is performed immediately after the last symbol of the CG uplink transmission on the second resource. If the set of conditions mentioned above is not met, The aforementioned CG uplink transmission is interrupted (dropped) before the start point of the second resource. A communication method characterized in that the set of conditions includes a first condition which is satisfied when the second resource occupies all resource blocks (RBs) of a subset of the plurality of LBT bandwidth sets. [Claim 14] The communication method according to claim 13, characterized in that the channel access procedure is performed based on random backoff using a variable-size contention window (CW). [Claim 15] The communication method according to claim 14, wherein the set of conditions is further characterized by including a second condition which is satisfied when the first Channel Access Priority Class (CAPC) value of the channel access performed is greater than or equal to the second CAPC value corresponding to the scheduled uplink transmission. [Claim 16] The communication method according to claim 15, wherein the set of conditions is further characterized by including a third condition that is satisfied when the sum of the transmission duration of the first resource and the transmission duration of the second resource in the time domain resource does not exceed the Maximum Channel Occupancy Time (MCOT) corresponding to the first CAPC value.

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