Method and apparatus for performing sidelink communication in wireless communication system

Abstract

A method and apparatus for performing sidelink communication in a wireless communication system are disclosed. A method for a first terminal to perform sidelink communication according to one embodiment of the present disclosure comprises: receiving from a base station configuration information related to an SL resource pool containing first information related to at least one subchannel; and transmitting to a second terminal sidelink control information indicating an index of a specific subchannel among the at least one subchannel, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information may include the number of the at least one RB-interlace and an index of a starting interlace.

Description

Technology Field

[0001] The present disclosure relates to a wireless communication system, and more specifically, to a method and apparatus for performing sidelink communication in a wireless communication system. Background Technology

[0002] Mobile communication systems were developed to provide voice services while ensuring user mobility. However, mobile communication systems have expanded their scope to include data services as well as voice. Currently, due to the explosive increase in traffic leading to resource shortages and users demanding higher-speed services, more advanced mobile communication systems are required.

[0003] The requirements for next-generation mobile communication systems largely include the ability to accommodate explosive data traffic, a dramatic increase in transmission rates per user, a significantly increased number of connected devices, very low end-to-end latency, and high energy efficiency. To achieve this, various technologies are being researched, such as dual connectivity, massive multiple input multiple output (MMIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] A mobile communication system can support direct terminal-to-terminal communication (i.e., sidelink communication) performed using a sidelink resource allocation mode, physical-layer signals / channels, and physical layer procedures. The resource allocation modes supported in sidelink communication are divided into Mode 1, where sidelink resource allocation is provided by the network, and Mode 2, where the terminal determines sidelink transmission resources from a resource pool.

[0005] Meanwhile, an interlaced uplink channel structure has been introduced in the unlicensed band, taking into account regulatory requirements such as occupied channel bandwidth and power spectral density. However, a frequency domain resource allocation method has not yet been introduced when sidelink communication is supported in the unlicensed band. The problem to be solved

[0006] The technical problem of the present disclosure is to provide a method and apparatus for performing sidelink communication in a wireless communication system.

[0007] The technical problem of the present disclosure is to provide a method and apparatus for setting up resources in the frequency domain for sidelink transmission in an unlicensed band.

[0008] The technical problem of the present disclosure is to provide a method and apparatus for configuring a subchannel based on information related to a resource block-interlace.

[0009] The technical problems to be solved in this disclosure are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this disclosure belongs from the description below. means of solving the problem

[0010] In one embodiment of the present disclosure, a method for a first terminal to perform sidelink communication in a wireless communication system comprises: receiving from a base station configuration information related to an SL resource pool containing first information related to at least one subchannel; and transmitting sidelink control information (SCI) indicating an index of a specific subchannel among the at least one subchannel to a second terminal, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information may include the number of the at least one RB-interlace and an index of a starting interlace.

[0011] In another embodiment of the present disclosure, a method for a second terminal to perform sidelink communication in a wireless communication system comprises: receiving sidelink control information (SCI) from a first terminal indicating an index of a specific subchannel among at least one subchannel; and receiving sidelink data from the first terminal based on the SCI, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the at least one subchannel may be configured based on configuration information related to an SL resource pool. Effects of the invention

[0012] In one embodiment of the present disclosure, a method and apparatus for performing sidelink communication in a wireless communication system may be provided.

[0013] In one embodiment of the present disclosure, a method and apparatus for efficiently setting resources in the frequency domain for sidelink transmission in an unlicensed band may be provided.

[0014] In one embodiment of the present disclosure, a method and apparatus for configuring one subchannel based on information related to RB-interlacing may be provided.

[0015] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below. Brief explanation of the drawing

[0016] The accompanying drawings, which are included as part of the detailed description to aid in understanding the present disclosure, provide embodiments of the present disclosure and explain the technical features of the present disclosure together with the detailed description. FIG. 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied. FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure may be applied. FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure may be applied. FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied. FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure may be applied. FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure may be applied, and a general method of transmitting and receiving signals using these channels. FIG. 7 illustrates a wireless protocol structure for SL communication to which the present disclosure can be applied. FIGS. 8 and 9 illustrate a procedure in which a terminal and / or a base station perform V2X (Vehicle-to-X; Vehicle-to-Everything) or SL communication in a wireless communication system to which the present disclosure may be applied. FIG. 10 is a diagram illustrating resource units and measurement operations for measuring channel busy ratio (CBR) to which the present disclosure can be applied. FIG. 11 is a diagram illustrating the process of a first terminal performing side-link communication according to one embodiment of the present disclosure. FIG. 12 is a diagram illustrating the process of a second terminal performing side-link communication according to one embodiment of the present disclosure. FIG. 13 is a diagram illustrating a signaling procedure of a base station, a first terminal, and a second terminal according to one embodiment of the present disclosure. FIG. 14 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure. Specific details for implementing the invention

[0017] Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present disclosure and is not intended to represent the only embodiment in which the present disclosure may be practiced. The following detailed description includes specific details to provide a complete understanding of the present disclosure. However, those skilled in the art will know that the present disclosure may be practiced without such specific details.

[0018] In some cases, to avoid obscuring the concept of the present disclosure, known structures and devices may be omitted or illustrated in the form of a block diagram focusing on the core functions of each structure and device.

[0019] In the present disclosure, when a component is described as being “connected,” “combined,” or “joined” with another component, this may include not only a direct connection but also an indirect connection in which another component exists between them. Furthermore, in the present disclosure, the terms “comprising” or “having” specify the presence of the mentioned features, steps, actions, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, actions, elements, components, and / or groups thereof.

[0020] In the present disclosure, terms such as "first," "second," etc. are used solely for the purpose of distinguishing one component from another and are not used to limit the components, nor do they limit the order or importance of the components unless specifically stated otherwise. Accordingly, within the scope of the present disclosure, a first component in one embodiment may be referred to as a second component in another embodiment, and likewise, a second component in one embodiment may be referred to as a first component in another embodiment.

[0021] The terms used in this disclosure are for the description of specific embodiments and are not intended to limit the claims. As used in the description of embodiments and in the appended claims, the singular form is intended to include the plural form unless the context clearly indicates otherwise. The term "and / or" as used in this disclosure may refer to any one of the related enumerated items, or refers to and includes any and all possible combinations of two or more of them. Additionally, the " / " between words in this disclosure has the same meaning as "and / or" unless otherwise noted.

[0022] The present disclosure describes a wireless communication network or a wireless communication system, and operations performed in the wireless communication network may be performed in the process of controlling the network and transmitting or receiving signals by a device (e.g., a base station) governing the wireless communication network, or in the process of transmitting or receiving signals with or between the network and terminals by a terminal connected to the wireless network.

[0023] In the present disclosure, transmitting or receiving a channel includes the meaning of transmitting or receiving information or a signal through said channel. For example, transmitting a control channel means transmitting control information or a signal through the control channel. Similarly, transmitting a data channel means transmitting data information or a signal through the data channel.

[0024] In the following, the downlink (DL) refers to communication from a base station to a terminal, and the uplink (UL) refers to communication from a terminal to a base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The base station may be referred to as the first communication device, and the terminal as the second communication device.

[0025] Base Station (BS) can be replaced by terms such as fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), Access Point (AP), network (5G network), Artificial Intelligence (AI) system / module, Roadside Unit (RSU), robot, Unmanned Aerial Vehicle (UAV), Augmented Reality (AR) device, and Virtual Reality (VR) device. In addition, the terminal may be fixed or mobile and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, RSU (road side unit), robot, AI (Artificial Intelligence) module, drone (UAV: Unmanned Aerial Vehicle), AR (Augmented Reality) device, VR (Virtual Reality) device.

[0026] The following technologies can be used in various wireless access systems such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile Communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is part of the UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is part of E-UMTS (Evolved UMTS) using E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0027] For clarity of explanation, the description is based on 3GPP communication systems (e.g., LTE-A, NR), but the technical scope of this disclosure is not limited thereto. LTE refers to technology from 3GPP Technical Specification (TS) 36.xxx Release 8 onwards. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onwards is referred to as LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onwards is referred to as LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onwards. LTE / NR may be referred to as a 3GPP system. "xxx" indicates a specific standard document number. LTE / NR may be collectively referred to as a 3GPP system. Regarding background technology, terms, abbreviations, etc. used in the description of this disclosure, reference may be made to matters described in standard documents published prior to this disclosure. For example, the following documents may be referenced.

[0028] For 3GPP LTE, refer to TS 36.211 (Physical channels and modulation), TS 36.212 (Multiplexing and channel coding), TS 36.213 (Physical layer procedures), TS 36.300 (General description), and TS 36.331 (Radio resource control).

[0029] For 3GPP NR, you may refer to TS 38.211 (Physical Channels and Modulation), TS 38.212 (Multiplexing and Channel Coding), TS 38.213 (Physical Layer Procedures for Control), TS 38.214 (Physical Layer Procedures for Data), TS 38.300 (General Description of NR and NG-RAN (New Generation-Radio Access Network)), and TS 38.331 (Radio Resource Control Protocol Specification).

[0030] Abbreviations of terms that may be used in this disclosure are defined as follows.

[0031] - BM: Beam management

[0032] - CQI: Channel quality indicator

[0033] - CRI: Channel State Information - Reference Signal Resource Indicator

[0034] - CSI: Channel state information

[0035] - CSI-IM: Channel state information - interference measurement

[0036] - CSI-RS: Channel state information - reference signal

[0037] - DMRS: demodulation reference signal

[0038] - FDM: Frequency Division Multiplexing

[0039] - FFT: Fast Fourier Transform

[0040] - IFDMA: Interleaved frequency division multiple access

[0041] - IFFT: Inverse Fast Fourier Transform

[0042] - L1-RSRP: Layer 1 reference signal received power

[0043] - L1-RSRQ: Layer 1 reference signal received quality

[0044] - MAC: Medium Access Control

[0045] - NZP: Non-zero power

[0046] - OFDM: Orthogonal Frequency Division Multiplexing

[0047] - PDCCH: Physical downlink control channel

[0048] - PDSCH: Physical downlink shared channel

[0049] - PMI: Precoding Matrix Indicator

[0050] - RE: resource element

[0051] - RI: Rank indicator

[0052] - RRC: Radio Resource Control

[0053] - RSSI: Received signal strength indicator

[0054] - Rx: Reception

[0055] - QCL: quasi co-location

[0056] - SINR: Signal to interference and noise ratio

[0057] - SSB (or SS / PBCH block): Synchronization signal block (including primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH))

[0058] - TDM: Time Division Multiplexing

[0059] - TRP: transmission and reception point

[0060] - TRS: Tracking Reference Signal

[0061] - Tx: transmission

[0062] - UE: User equipment

[0063] - ZP: Zero Power

[0064] General System

[0065] As more communication devices require larger communication capacities, the need for enhanced mobile broadband communication compared to existing radio access technology (RAT) is emerging. In addition, massive machine-type communications (MTC), which connects multiple devices and objects to provide various services anytime and anywhere, is also one of the major issues to be considered in next-generation communication. Furthermore, communication system designs that take into account services and terminals sensitive to reliability and latency are being discussed. As such, the introduction of next-generation RAT considering eMBB (enhanced mobile broadband communication), Mmtc (massive MTC), and URLLC (ultra-reliable and low latency communication) is being discussed, and for convenience, this technology is referred to as NR in this disclosure. NR is an expression representing an example of 5G RAT.

[0066] A new RAT system including NR uses an OFDM transmission method or a similar transmission method. The new RAT system may follow OFDM parameters different from those of LTE. Alternatively, the new RAT system may follow the existing LTE / LTE-A numerology but support a larger system bandwidth (e.g., 100 MHz). Or, a single cell may support multiple numerologies. That is, terminals operating with different numerologies can coexist within a single cell.

[0067] Numerology corresponds to a single subcarrier spacing in the frequency domain. Different numerologies can be defined by scaling the reference subcarrier spacing to an integer N.

[0068] FIG. 1 illustrates the structure of a wireless communication system to which the present disclosure can be applied.

[0069] Referring to FIG. 1, the NG-RAN consists of gNBs that provide NG-RA (NG-Radio Access) user plane (i.e., new AS (access stratum) sublayer / PDCP (packet data convergence protocol) / RLC (radio link control) / MAC / PHY) and control plane (RRC) protocol endpoints for the UE. The gNBs are interconnected via Xn interfaces. The gNBs are also connected to the NGC (New Generation Core) via NG interfaces. More specifically, the gNBs are connected to the AMF (Access and Mobility Management Function) via N2 interfaces and to the UPF (User Plane Function) via N3 interfaces.

[0070] FIG. 2 illustrates a frame structure in a wireless communication system to which the present disclosure may be applied.

[0071] An NR system can support multiple numerologies. Here, the numerology can be defined by subcarrier spacing and cyclic prefix (CP) overhead. In this case, multiple subcarrier spacings can be derived by scaling the base (reference) subcarrier spacing by an integer N (or μ). Furthermore, the numerology used can be selected independently of the frequency band, even if it is assumed that very low subcarrier spacings are not used at very high carrier frequencies. Additionally, various frame structures based on multiple numerologies can be supported in an NR system.

[0072] Below, we examine the OFDM numerologies and frame structures that can be considered in NR systems. Many OFDM numerologies supported in NR systems can be defined as shown in Table 1 below.

[0073] μ Δf=2 μ ·15 [kHz] CP 0 15 Normal 1 30 common 2 60 General, Extended 3 120 common 4 240 common

[0074] NR supports multiple numerologies (or subcarrier spacing, SCS) to support various 5G services. For example, if the SCS is 15 kHz, it supports a wide area in traditional cellular bands; if the SCS is 30 kHz / 60 kHz, it supports dense-urban environments, lower latency, and wider carrier bandwidth; and if the SCS is 60 kHz or higher, it supports a bandwidth greater than 24.25 GHz to overcome phase noise. NR frequency bands are defined by two types of frequency ranges (FR1 and FR2). FR1 and FR2 can be configured as shown in Table 2 below. Additionally, FR2 may refer to millimeter wave (mmW).

[0075] Frequency Range Designation Corresponding frequency range Subcarrier Spacing FR1 410MHz - 7125MHz 15, 30, 60kHz FR2 24250MHz - 52600MHz 60, 120, 240kHz

[0076] Regarding the frame structure in an NR system, the size of various fields in the time domain is T c =1 / (Δf max ·N f It is expressed as a multiple of the time unit of ). Here, Δf max =480·10 3 It is Hz, and N f = 4096. Downlink and uplink transmission is T f =1 / (Δf max N f / 100)·T c It is organized into radio frames having an interval of =10ms. Here, each radio frame is T sf =(Δf max N f / 1000)·T cIt consists of 10 subframes with an interval of = 1ms. In this case, there may be one set of frames for the uplink and one set of frames for the downlink. Additionally, the transmission at uplink frame number i from the terminal occurs T before the start of the corresponding downlink frame at the terminal. TA =(N TA +N TA,offset )T c Must start previously. For a subcarrier spacing configuration μ, the slots are n within the subframe. s μ ∈{0,..., N slot subframe,μ Numbered in increasing order of {-1}, and n within the wireless frame s,f μ ∈{0,..., N slot frame,μ Numbers are assigned in increasing order of {-1}. One slot is N symb slot It consists of consecutive OFDM symbols of, and N symb slot is determined by CP. Slot n in the subframe s μ The start is OFDM symbol n in the same subframe. s μ N symb slot It is aligned temporally with the start of. Not all terminals can transmit and receive simultaneously, which means that not all OFDM symbols in the downlink slot or uplink slot can be utilized. Table 3 shows the number of OFDM symbols per slot (N) in a standard CP. symb slot ), number of slots per wireless frame (N slot frame,μ ), number of slots per subframe (N slot subframe,μTable 4 shows the number of OFDM symbols per slot, the number of slots per wireless frame, and the number of slots per subframe in the extended CP.

[0077] μ N symb slot N slot frame,μ N slot subframe,μ 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0078] μ N symb slot N slot frame,μ N slot subframe,μ 2 12 40 4

[0079] Figure 2 is an example of the case where μ=2 (SCS is 60kHz). Referring to Table 3, one subframe can contain four slots. The slots in Figure 2, 1 subframe={1,2,4}, are examples, and the number of slot(s) that can be included in one subframe is defined as in Table 3 or Table 4. Additionally, a mini-slot can contain 2, 4, or 7 symbols, or more or fewer symbols. Regarding physical resources in an NR system, antenna ports, resource grids, resource elements, resource blocks, carrier parts, etc., may be considered. Below, the physical resources that can be considered in an NR system will be examined in detail. First, regarding antenna ports, an antenna port is defined such that the channel carrying a symbol on the antenna port can be inferred from the channel carrying another symbol on the same antenna port. If the large-scale property of the channel carrying a symbol on one antenna port can be inferred from the channel carrying a symbol on another antenna port, the two antenna ports can be said to be in a QC / QCL (quasi-co-located or quasi-co-location) relationship. Here, the large-scale property includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

[0080] FIG. 3 illustrates a resource grid in a wireless communication system to which the present disclosure may be applied. Referring to FIG. 3, the resource grid is N in the frequency domain. RB μ N sc RB It consists of subcarriers, and one subframe is 14.2 μ It is described by way of example as being composed of OFDM symbols, but is not limited thereto. In an NR system, the transmitted signal is N RB μ N sc RB One or more resource grids composed of subcarriers and 2 μ N symb (μ) It is described by the OFDM symbols of. Here, N RB μ ≤N RB max,μ It is. The above N RB max,μ represents the maximum transmission bandwidth, which can vary between uplink and downlink as well as numerologies.

[0081] In this case, a single resource grid can be established for each μ and antenna port p. Each element of the resource grid for μ and antenna port p is referred to as a resource element and is uniquely identified by an index pair (k,l'). Here, k=0,...,N RB μ N sc RB -1 is an index in the frequency domain, and l'=0,...,2 μ N symb (μ) -1 refers to the location of a symbol within a subframe. When referring to a resource element in a slot, an index pair (k,l) is used.

[0082] Here, l=0,...,Nsymb μ It is -1. The resource factor (k,l') for μ and antenna port p is the complex value a k,l' (p,μ) It corresponds to. If there is no risk of confusion or if a specific antenna port or numerology is not specified, the indices p and μ may be dropped, and the resulting complex value is a k,l' (p) or a k,l' This can be. In addition, the resource block (RB) is N in the frequency domain. sc RB =12 is defined by consecutive subcarriers. Point A serves as the common reference point of the resource block grid and is obtained as follows.

[0083] - OffsetToPointA for the Primary Cell (PCell) downlink represents the frequency offset between point A and the lowest subcarrier of the lowest resource block that overlaps with the SS / PBCH block used by the terminal for initial cell selection. It is expressed in resource block units assuming a 15 kHz subcarrier interval for FR1 and a 60 kHz subcarrier interval for FR2.

[0084] - absoluteFrequencyPointA represents the frequency-location of point A as expressed in ARFCN (absolute radio-frequency channel number).

[0085] Common resource blocks are numbered from 0 upward in the frequency domain for a subcarrier spacing setting μ. The center of subcarrier 0 of common resource block 0 for a subcarrier spacing setting μ coincides with 'point A'. Common resource block number n in the frequency domain CRB μ The relationship between the resource element (k,l) and the subcarrier spacing setting μ is given as Equation 1 below.

[0086]

[0087] In Equation 1, k is defined relative to point A such that k=0 corresponds to a subcarrier centered at point A. Physical resource blocks range from 0 to N within the bandwidth part (BWP). BWP,i size,μ Numbers are assigned up to -1, and i is the BWP number. Physical resource block n in BWP i. PRB and common resource block n CRB The relationship between them is given by the following mathematical formula 2.

[0088]

[0089] N BWP,i start,μ is a common resource block where BWP starts relative to common resource block 0.

[0090] FIG. 4 illustrates a physical resource block in a wireless communication system to which the present disclosure may be applied. FIG. 5 illustrates a slot structure in a wireless communication system to which the present disclosure may be applied.

[0091] Referring to FIGS. 4 and 5, a slot contains multiple symbols in the time domain. For example, in the case of a standard CP, one slot contains 7 symbols, but in the case of an extended CP, one slot contains 6 symbols.

[0092] A carrier includes multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive (physical) resource blocks in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication is performed through the active BWPs, and only one BWP can be active for a single terminal. In the resource grid, each element is referred to as a Resource Element (RE) and can be mapped to a single complex symbol.

[0093] NR systems can support up to 400 MHz per component carrier (CC). If a terminal operating in such wideband CC always keeps the radio frequency (RF) chip for the entire CC turned on, the terminal's battery consumption may increase.

[0094] Alternatively, when considering various use cases operating within a single broadband CC (e.g., eMBB, URLLC, Mmtc, V2X, etc.), different numerologies (e.g., subcarrier spacing, etc.) may be supported for each frequency band within the CC.

[0095] Alternatively, the capability for maximum bandwidth may vary by terminal. Considering this, the base station may instruct the terminal to operate only in a portion of the bandwidth rather than the entire bandwidth of the broadband CC, and for convenience, this portion of the bandwidth is defined as the bandwidth part (BWP). The BWP may consist of consecutive RBs on the frequency axis and may correspond to a single numerology (e.g., subcarrier spacing, CP length, slot / mini-slot interval).

[0096] Meanwhile, the base station can configure multiple BWPs within a single CC configured for the terminal. For example, a BWP occupying a relatively small frequency domain can be configured in the PDCCH monitoring slot, and the PDSCH indicated by the PDCCH can be scheduled on a larger BWP. Alternatively, if UEs are concentrated on a specific BWP, some terminals can be configured to a different BWP for load balancing. Or, considering frequency domain inter-cell interference cancellation between neighboring cells, a portion of the spectrum in the middle of the total bandwidth can be excluded, and both BWPs can be configured within the same slot.

[0097] That is, the base station can set at least one DL / UL BWP for a terminal associated with the broadband CC. The base station can activate at least one of the DL / UL BWP(s) set at a specific time (by L1 signaling, MAC CE (Control Element), RRC signaling, etc.). Additionally, the base station can instruct a switching to another set DL / UL BWP (by L1 signaling, MAC CE, RRC signaling, etc.). Alternatively, a switching to a predetermined DL / UL BWP may occur based on a timer when the timer value expires. In this case, the activated DL / UL BWP is defined as the active DL / UL BWP. However, since the terminal may not receive the setting for the DL / UL BWP in situations such as when the terminal is performing the initial access process or before the RRC connection is set up, the DL / UL BWP assumed by the terminal in such situations is defined as the initial active DL / UL BWP.

[0098] FIG. 6 illustrates physical channels used in a wireless communication system to which the present disclosure may be applied, and a general method of transmitting and receiving signals using these channels.

[0099] In a wireless communication system, a terminal receives information from a base station via the downlink and transmits information to the base station via the uplink. The information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0100] When the terminal is powered on or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station (S601). To do this, the terminal receives a primary synchronization signal (PSS) and a secondary synchronization signal (PSS) from the base station to synchronize with the base station and obtain information such as a cell identifier (ID). After that, the terminal receives a physical broadcast channel (PBCH) from the base station to obtain broadcast information within the cell. Meanwhile, during the initial cell search phase, the terminal receives a downlink reference signal (DL RS) to check the downlink channel status.

[0101] A terminal that has completed initial cell search can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink sharing channel (PDSCH) according to the information carried on the PDCCH (S602).

[0102] Meanwhile, when connecting to a base station for the first time or when there are no wireless resources for signal transmission, the terminal may perform a random access procedure (RACH) with respect to the base station (steps S603 to S606). To do this, the terminal transmits a specific sequence as a preamble through a physical random access channel (PRACH) (S603 and S605), and may receive a response message for the preamble through a PDCCH and a corresponding PDSCH (S604 and S606). In the case of a contention-based RACH, a contention resolution procedure may additionally be performed.

[0103] A terminal that has performed the procedure described above may subsequently perform PDCCH / PDSCH reception (S607) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) transmission (S608) as a general uplink / downlink signal transmission procedure. In particular, the terminal receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and its format varies depending on its purpose of use.

[0104] Meanwhile, control information transmitted by the terminal to the base station via the uplink or received by the terminal from the base station includes downlink / uplink ACK / NACK (Acknowledgement / Non-Acknowledgement) signals, CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indicator), etc. In the case of a 3GPP LTE system, the terminal may transmit the aforementioned control information, such as CQI / PMI / RI, via PUSCH and / or PUCCH.

[0105] Table 5 shows an example of the DCI format in an NR system.

[0106] DCI format conjugation 0_0 Scheduling of PUSCH within a single cell 0_1 Scheduling of one or multiple PUSCHs within a single cell, or instruction to the UE regarding cell group (CG) downlink feedback information 0_2 Scheduling of PUSCH within a single cell 1_0 Scheduling of PDSCH within a single DL cell 1_1 Scheduling of PDSCH within a single cell 1_2 Scheduling of PDSCH within a single cell

[0107] Referring to Table 5, DCI formats 0_0, 0_1, and 0_2 may include resource information related to PUSCH scheduling (e.g., UL / SUL (Supplementary UL), frequency resource allocation, time resource allocation, frequency hopping, etc.), transport block (TB) related information (e.g., MCS (Modulation Coding and Scheme), NDI (New Data Indicator), RV (Redundancy Version), etc.), HARQ (Hybrid - Automatic Repeat and request) related information (e.g., process number, DAI (Downlink Assignment Index), PDSCH-HARQ feedback timing, etc.), multi-antenna related information (e.g., DMRS sequence initialization information, antenna port, CSI request, etc.), and power control information (e.g., PUSCH power control, etc.), and the control information included in each DCI format may be predefined. DCI format 0_0 is used for PUSCH scheduling in a single cell. The information contained in DCI format 0_0 is transmitted after being scrambled with a cyclic redundancy check (CRC) by a cell radio network temporary identifier (Cell RNTI), a configured scheduling RNTI (CS-RNTI), or a modulation coding scheme cell RNTI (MCS-C-RNTI). DCI format 0_1 ​​is used to instruct a terminal on the scheduling of one or more PUSCHs in a cell, or on configured grant (CG) downlink feedback information. The information contained in DCI format 0_1 ​​is transmitted after being scrambled with a CRC by a cell radio network temporary identifier (Cell RNTI), a CS-RNTI, a semi-persistent CSI RNTI (SP-CSI-RNTI), or an MCS-C-RNTI.

[0108] DCI format 0_2 is used for scheduling PUSCH in a single cell. The information contained in DCI format 0_2 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, or MCS-C-RNTI.

[0109] Next, DCI formats 1_0, 1_1, and 1_2 may include resource information related to PDSCH scheduling (e.g., frequency resource allocation, time resource allocation, VRB (virtual resource block)-PRB (physical resource block) mapping, etc.), transmission block (TB) related information (e.g., MCS, NDI, RV, etc.), HARQ related information (e.g., process number, DAI, PDSCH-HARQ feedback timing, etc.), multiple antenna related information (e.g., antenna port, TCI (transmission configuration indicator), SRS (sounding reference signal) request, etc.), PUCCH related information (e.g., PUCCH power control, PUCCH resource indicator, etc.), and the control information included in each DCI format may be predefined.

[0110] DCI format 1_0 is used for scheduling PDSCH in a single DL cell. The information contained in DCI format 1_0 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0111] DCI format 1_1 is used for scheduling PDSCH in a single cell. The information contained in DCI format 1_1 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0112] DCI format 1_2 is used for PDSCH scheduling in a single cell. The information contained in DCI format 1_2 is transmitted after being CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI.

[0113] V2X (Vehicle-to-X; Vehicle-to-Everything) communication

[0114] V2X communication refers to a communication method that exchanges or shares information, such as traffic conditions, while communicating with road infrastructure and other vehicles while driving. V2X may include V2V (vehicle-to-vehicle), which refers to LTE (Long Term Evolution) / NR-based communication between vehicles; V2P (vehicle-to-pedestrian), which refers to LTE / NR-based communication between a vehicle and a terminal carried by a person; and V2I / N (vehicle-to-infrastructure / network), which refers to LTE / NR-based communication between a vehicle and a roadside unit (RSU) / network.

[0115] Here, the RSU may be a transportation infrastructure entity implemented by a base station or a fixed terminal, for example, an entity that transmits a speed notification to a vehicle. Additionally, V2X communication may include a method using a PC5 link (or sidelink, SL) which is a terminal-to-terminal (D2D) communication interface, a method using a Uu link (or uplink and downlink) which is a communication interface between a base station and a terminal, or a method using both a PC5 link and a Uu link.

[0116] FIG. 7 illustrates a radio protocol architecture for SL communication. An embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. Specifically, FIG. 7 (a) illustrates a user plane protocol stack, and FIG. 7 (b) illustrates a control plane protocol stack.

[0117] Sidelink (SL) synchronization signal transmission and reception method

[0118] The following describes the configuration and transmission / reception methods of the Sidelink Synchronization Signal (SLSS).

[0119] SLSS is a specific sequence in SL and may include PSSS (Primary Sidelink Synchronization Signal) and SSSS (Secondary Sidelink Synchronization Signal).

[0120] PSSS can be referred to as S-PSS (Sidelink Primary Synchronization Signal), and SSSS can be referred to as S-SSS (Sidelink Secondary Synchronization Signal).

[0121] For example, length-127 M-sequences can be used for S-PSS, and length-127 Gold sequences can be used for S-SSS.

[0122] For example, the terminal can detect the initial signal and acquire synchronization using S-PSS. For example, the terminal can acquire detailed synchronization and detect the synchronization signal ID using S-PSS and S-SSS.

[0123] PSBCH (Physical Sidelink Broadcast Channel) may be a (broadcast) channel that carries basic (system) information that the terminal needs to know first before transmitting or receiving SL signals.

[0124] For example, basic (system) information may include information related to SLSS, duplex mode (DM), TDD UL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool information, types of applications related to SLSS, subframe offset, broadcast information, etc. For example, to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH may be 56 bits (including a 24-bit CRC).

[0125] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL SS (Synchronization Signal) / PSBCH block, hereinafter S-SSB (Sidelink-Synchronization Signal Block)).

[0126] The above S-SSB may have the same numerology (i.e., SCS and CP lengths) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) within the carrier, and the transmission bandwidth may be within the (pre-)set SL BWP (Sidelink BWP).

[0127] For example, the bandwidth of the S-SSB can be 11 RB (Resource Block). For example, the PSBCH can span across 11 RB. Also, the frequency position of the S-SSB can be (pre)set. Therefore, the terminal may not need to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0128] For example, the terminal can generate an S-SS / PSBCH block (i.e., S-SSB) and transmit the generated S-SS / PSBCH block (i.e., S-SSB) by mapping it onto a physical resource.

[0129] SL signal transmission and reception method

[0130] FIG. 8 is a flowchart illustrating a procedure for performing V2X communication or SL communication according to a transmission mode (or allocation mode) according to one embodiment of the present disclosure. The embodiment illustrated in FIG. 8 may be combined with various embodiments of the present disclosure.

[0131] For the convenience of explanation, the transmission mode in LTE will be referred to as the LTE transmission mode, and the transmission mode in NR will be referred to as the NR resource allocation mode.

[0132] For example, FIG. 8(a) illustrates terminal operations related to LTE transmission mode 1, LTE transmission mode 3, and / or NR resource allocation mode 1. Here, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication. As another example, FIG. 7(b) illustrates terminal operations related to LTE transmission mode 2, LTE transmission mode 4, and / or NR resource allocation mode 2.

[0133] Referring to FIG. 8(a), in LTE transmission mode 1, LTE transmission mode 3, or / and NR resource allocation mode 1, the base station can schedule SL resources to be used for SL transmission by the terminal.

[0134] For example, in step S8000, the base station may transmit information related to SL resources and / or information related to UL resources to the first terminal. Here, the UL resources may include PUCCH resources, PUSCH resources, and / or resources for reporting SL HARQ feedback to the base station.

[0135] For example, the first terminal may receive information related to a dynamic grant (DG) resource and / or a configured grant (CG) resource from the base station. For example, the CG resource may include a CG type 1 resource or a CG type 2 resource. Here, the DG resource refers to a resource that the base station sets / assigns to the first terminal via DCI, and the CG resource may be a (periodic) resource that the base station sets / assigns to the first terminal via DCI and / or RRC messages.

[0136] For example, a base station may transmit an RRC message containing information related to a CG type 1 resource to a first terminal. As another example, in the case of a CG type 2 resource, the base station may transmit an RRC message containing information related to the CG type 2 resource to the first terminal, and the base station may transmit a DCI related to the activation or release of the CG resource to the first terminal.

[0137] For example, the DCI transmitted by the base station to the first terminal may be a DCI for scheduling the SL. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0138] Specifically, DCI format 3_0 can be used for scheduling NR PSCCH and NR PSSCH in a single cell. DCI format 3_0, CRC scrambled by SL-RNTI or SL-CS-RNTI, may include resource pool indices, time gaps, SCI format 1-A (e.g., frequency / time resource allocation), PSFCH-to-HARQ feedback timing indicators, PUCCH resource indicators, set indices, etc.

[0139] DCI format 3_1 can be used for scheduling LTE PSCCH and LTE PSSCH in a single cell. DCI format 3_1, CRC scrambled by SL-L-CS-RNTI, may include a timing offset, a carrier indicator, the location of frequency resources for the initial transmission and retransmission, an SL index, an SL SPS setting index, etc.

[0140] In step S8010, the first terminal may transmit a Physical Sidelink Control Channel (PSCCH) to the second terminal based on resource scheduling by the base station. Here, the PSCCH may indicate the resources and other transmission parameters used by the terminal for the PSSCH. The PSCCH transmission may be associated with DM-RS, sidelink control information (SCI), or the first stage (1 st stage) SCI can be transmitted to the second terminal.

[0141] In step S8020, the first terminal may transmit a PSSCH associated with the PSCCH (e.g., second stage SCI, MAC PDU, data, etc.) to the second terminal. The PSSCH may include the TB of data itself and may include control information for HARQ procedures and CSI feedback triggers, etc. At least 6 OFDM symbols within the slot may be used for the transmission of the PSSCH.

[0142] In step S8030, the first terminal may receive a PSFCH associated with a PSCCH / PSSCH from the second terminal. The PSFCH may carry HARQ feedback (e.g., ACK / NACK information) via a sidelink from the terminal that performed the transmission to the terminal that is the intended recipient of the PSSCH transmission. The PSFCH sequence may be transmitted in a single PRB that is repeated over two OFDM symbols near the end of the sidelink resource in one slot.

[0143] In step S8040, the first terminal may transmit / report HARQ feedback information to the base station via PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on HARQ feedback information received from the second terminal. As another example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on a preset rule.

[0144] Referring to FIG. 8(b), in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine an SL transmission resource within an SL resource set by the base station / network or a preset SL resource.

[0145] For example, SL resources configured by a base station / network or pre-configured SL resources may be a resource pool. For example, a terminal may autonomously select or schedule resources for SL transmission. The terminal may perform SL communication by selecting a resource itself from within the configured resource pool.

[0146] As another example, the terminal can select a resource itself within a selection window by performing a sensing and resource (re)selection procedure, and the sensing can be performed at the subchannel level.

[0147] For example, at step S8010, a first terminal that selects a resource itself within a resource pool can use the selected resource to transmit a PSCCH (e.g., SCI or 1st-stage SCI) to a second terminal. At step S8020, the first terminal can transmit a PSSCH associated with the PSCCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) to the second terminal. At step S8030, the first terminal can receive a PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0148] Referring to FIG. 8 (a) or (b), the first terminal may transmit an SCI to the second terminal over the PSCCH. Alternatively, for example, the first terminal may transmit two consecutive SCIs (e.g., 2nd-stage SCIs) to the second terminal over the PSCCH and / or PSSCH. In this case, the second terminal may decode the two consecutive SCIs (e.g., 2nd-stage SCIs) to receive the PSSCH from the first terminal.

[0149] In the present disclosure, an SCI transmitted over a PSCCH may be referred to as a 1st SCI, a first SCI, a 1st-stage SCI, or a 1st-stage SCI format, and an SCI transmitted over a PSSCH may be referred to as a 2nd SCI, a second SCI, a 2nd-stage SCI, or a 2nd-stage SCI format. For example, a 1st-stage SCI format may include SCI format 1-A, and a 2nd-stage SCI format may include SCI format 2-A and / or SCI format 2-B.

[0150] SCI format 1-A can be used for scheduling PSSCH and 2nd-stage SCI on PSSCH. SCI format 1-A may include a frequency / time resource allocation field for scheduling, a resource reservation period field, a DMRS pattern field, a 2nd-stage SCI format field, an MCS field, an additional MCS table indicator field, a PSFCH overhead indicator field, a DMRS port number field, etc.

[0151] Table 6 below shows examples of 2nd-stage SCI format fields.

[0152] Value of a 2nd-stage SCI format field 2nd-stage SCI format 00 SCI format 2-A 01 SCI format 2-B 10 reserved 11 Reserved

[0153] SCI format 2-A is used for decoding PSSCH and can be used with HARQ operations when HARQ-ACK information contains ACK or NACK, when HARQ-ACK information contains only NACK, or when there is no feedback of HARQ-ACK information. SCI format 2-A may include a HARQ process number field, an NDI (new data indicator) field, an RV (redundancy version) field, a source ID field, a cast type indicator field, a CSI request field, etc.

[0154] Table 7 below shows examples of 2nd-stage SCI format fields.

[0155] Cast type specifier value Cast type 00 Broadcast 01 If HARQ-ACK information includes ACK or NACK, group cast 10 Unicast 11 If HARQ-ACK information contains only NACK, group cast

[0156] SCI format 2-B is used for decoding PSSCH and is used with HARQ operations when HARQ-ACK information contains only NACK or there is no feedback of HARQ-ACK information. SCI format 2-B may include a HARQ process number field, an NDI (new data indicator) field, an RV (redundancy version) field, a source ID field, a HARQ feedback enable / disabled field, etc.

[0157] Cast types for SL communication can be classified as shown in FIG. 9. Specifically, FIG. 9 (a) represents broadcast type SL communication, FIG. 9 (b) represents unicast type SL communication, and FIG. 9 (c) represents group cast type SL communication.

[0158] In the case of unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of group cast type SL communication, a terminal can perform SL communication with one or more terminals within the group to which it belongs. In various embodiments of the present disclosure, SL group cast communication may be replaced with SL multicast communication, SL one-to-many communication, etc.

[0159] SL HARQ Feedback Procedure

[0160] For example, the SL HARQ feedback procedure can be applied / enabled for unicast type SL communication. In this case, during a non-CBG (code block group) operation, if the receiving terminal decodes a PSCCH targeting the receiving terminal and the receiving terminal successfully decodes a transmission block associated with the PSCCH, the receiving terminal can generate a HARQ-ACK. Then, the receiving terminal can transmit the HARQ-ACK to the transmitting terminal.

[0161] On the other hand, if the receiving terminal fails to successfully decode the transmission block associated with the PSCCH after decoding the PSCCH targeting the receiving terminal, the receiving terminal may generate a HARQ-NACK. Then, the receiving terminal may transmit the HARQ-NACK to the transmitting terminal.

[0162] As another example, SL HARQ feedback can be applied / enabled for group cast type SL communication. For example, in non-CBG operation, the following two HARQ feedback options may be supported for group cast type SL communication.

[0163] (1) Group Cast Option 1: After the receiving terminal has decoded the PSCCH targeting the receiving terminal, if the receiving terminal fails to decode the transmission block associated with the PSCCH, the receiving terminal can send a HARQ-NACK to the transmitting terminal via the PSFCH.

[0164] On the other hand, if the receiving terminal decodes the PSCCH targeting the receiving terminal and the receiving terminal successfully decodes the transmission block associated with the PSCCH, the receiving terminal may not send a HARQ-ACK to the transmitting terminal.

[0165] (2) Group Cast Option 2: After the receiving terminal has decoded the PSCCH targeting the receiving terminal, if the receiving terminal fails to decode the transmission block associated with the PSCCH, the receiving terminal may send a HARQ-NACK to the transmitting terminal via PSFCH. Then, if the receiving terminal has decoded the PSCCH targeting the receiving terminal and the receiving terminal successfully decoded the transmission block associated with the PSCCH, the receiving terminal may send a HARQ-ACK to the transmitting terminal via PSFCH.

[0166] For example, if groupcast option 1 is used for SL HARQ feedback, all terminals performing groupcast communication can share PSFCH resources. For example, terminals belonging to the same group can transmit HARQ feedback using the same PSFCH resources.

[0167] For example, if groupcast option 2 is used for SL HARQ feedback, each terminal performing groupcast communication may use different PSFCH resources to transmit HARQ feedback. For example, terminals belonging to the same group may transmit HARQ feedback using different PSFCH resources.

[0168] Below, SL measurement and reporting will be explained.

[0169] For purposes such as QoS prediction, initial transmission parameter setting, link adaptation, link management, and admission control, SL measurement and reporting between terminals (e.g., RSRP, RSRQ) may be considered in SL.

[0170] For example, a receiving terminal can receive a reference signal from a transmitting terminal, and the receiving terminal can measure the channel status for the transmitting terminal based on the reference signal. Then, the receiving terminal can report the CSI to the transmitting terminal.

[0171] SL-related measurements and reporting may include the measurement and reporting of the channel busy ratio (CBR) and the reporting of location information. Examples of CSI for V2X may include CQI, PMI, RI, RSRP, RSRQ, path gain / path loss, SRI, CRI, interference condition, vehicle motion, etc. CSI reporting may be enabled or disabled depending on the settings.

[0172] For example, a transmitting terminal may transmit a CSI-RS to a receiving terminal, and the receiving terminal may use the CSI-RS to measure CQI or RI. For example, the CSI-RS may be referred to as SL CSI-RS. For example, the CSI-RS may be confined within a PSSCH transmission. For example, the transmitting terminal may include the CSI-RS on a PSSCH resource and transmit it to the receiving terminal.

[0173] The following describes sidelink congestion control.

[0174] For example, a terminal can determine whether the energy measured in a unit time / frequency resource is above a certain level, and can adjust the amount and frequency of its transmission resources according to the ratio of unit time / frequency resources in which energy above the certain level is observed. In the present disclosure, the ratio of time / frequency resources in which energy above the certain level is observed may be defined as the Channel Busy Ratio (CBR). The terminal can measure the CBR for a channel / frequency. Additionally, the terminal can transmit the measured CBR to a network / base station.

[0175] FIG. 10 illustrates a resource unit for measuring CBR according to one embodiment of the present disclosure. Referring to FIG. 10, when a terminal measures RSSI in subchannel units during a specific interval (e.g., 100ms), CBR may refer to the number of subchannels in which the measurement result value of RSSI has a value greater than or equal to a preset threshold.

[0176] Additionally, CBR may refer to the ratio of subchannels having a value greater than or equal to a preset threshold among subchannels during a specific interval. For example, in the embodiment of FIG. 10, assuming that the shaded subchannel is a subchannel having a value greater than or equal to a preset threshold, CBR may refer to the ratio of the shaded subchannel during a 100ms interval. Additionally, the terminal may report the CBR to the base station.

[0177] For example, when PSCCH and PSSCH are multiplexed in the frequency domain, the terminal can perform a single CBR measurement for a single resource pool. Here, if the PSFCH resource is configured or pre-configured, the PSFCH resource may be excluded from the CBR measurement.

[0178] Furthermore, congestion control considering the priority of traffic (e.g., packets) may be necessary. To this end, for example, a terminal can measure the Channel Occupancy Ratio (CR). Specifically, the terminal measures the CBR, and the terminal can determine the maximum value (CRlimitk) of the Channel Occupancy Ratio (Channel occupancy Ratio k, CRk) that traffic corresponding to each priority (e.g., k) can occupy according to the CBR.

[0179] For example, the terminal can derive a maximum channel occupancy value (CRlimitk) for each traffic priority based on a predefined table of CBR measurements. For example, for traffic with relatively high priority, the terminal can derive a relatively large maximum channel occupancy value.

[0180] Subsequently, the terminal can perform congestion control by limiting the total channel occupancy of traffic with priority k lower than i to a value below a certain threshold. According to this method, stronger channel occupancy limits can be applied to traffic with relatively lower priority.

[0181] In addition, the terminal can perform SL congestion control by using methods such as adjusting the size of the transmission power, dropping packets, determining whether to retransmit, and adjusting the size of the transmission RB (MCS adjustment).

[0182] Sidelink transmission and / or reception operations in the unlicensed band

[0183] In a wireless communication system, a terminal can perform sidelink transmission and / or reception operations in an unlicensed band (or, shared spectrum).

[0184] In operation within an unlicensed band, channel sensing operations (e.g., energy detection / measurement) for the channel to be used may be performed prior to the terminal's transmission, depending on band-specific regulations or requirements.

[0185] For example, if the channel or RB set to be used is determined to be idle based on the result of channel sensing (e.g., if the measured energy is below or less than a certain threshold), the terminal may perform transmission based on that channel or RB set in the unlicensed band. If the channel or RB set to be used is determined to be busy based on the result of channel sensing (e.g., if the measured energy is above or greater than a certain threshold), the terminal may cancel all or part of the transmission operation based on that channel or RB set in the unlicensed band.

[0186] In the present disclosure, an RB set may mean a set or channel composed of one or more RBs (i.e., a carrier or part of a carrier composed of a continuous set of resource blocks (RBs) on which channel access procedures are performed in a shared spectrum). As another example, an RB set may typically have a bandwidth of 20 MHz as a frequency axis unit on which channel sensing operations are performed.

[0187] In an unlicensed band, the terminal may perform a transmission operation during a specific time interval and then omit or simplify the channel sensing operation within a certain period (i.e., control the channel sensing interval to be relatively small). As another example, the terminal may determine whether to transmit by performing a general channel sensing operation after a certain period has elapsed following the transmission operation.

[0188] In addition, the time interval and / or frequency occupancy area and / or power spectral density (PSD) of the signal / channel transmitted by the terminal in the unlicensed band may each be above a certain level (depending on regulations or requirements).

[0189] In addition, to simplify channel sensing in the unlicensed band, the terminal can indicate that it occupies the channel secured through initial general channel sensing for a certain period of time through COT (channel occupancy time) information. The maximum value of the COT period length may be set differently depending on the priority value of the service or data packet.

[0190] Meanwhile, the base station can share the COT segment it acquired through channel sensing with the terminal via DCI, and the terminal can perform a specific (instructed) channel sensing type and / or CP extension within the COT segment based on the DCI information received from the base station.

[0191] The terminal can share the COT segment it has acquired through channel sensing with the base station, and the relevant information can be transmitted to the base station via CG-UCI. The base station can perform simplified channel sensing within the COT segment shared from the terminal.

[0192] In the case of SL communication, (as in Mode 1 RA (random access) operation) the terminal can be instructed by the base station via DCI or RRC signaling to use resources for SL transmission. Additionally, (as in Mode 2 RA operation) the terminal can perform SL transmission and reception operations through sensing operations between terminals without the assistance of the base station.

[0193] For channel access type 1, it can be used regardless of COT settings, and for channel access type 2, a simplified channel access type 2 can be used within the COT before transmission.

[0194] In this disclosure, Type 2A SL channel access is like Type 2A DL and / or 2A UL channel access, such as 'T short_sl It has a sensing interval of =25us', and the above sensing interval is 'T fIt can be configured with '=16us DURATION' and one sensing slot. 'T f ' can be configured to include a sensing slot at the beginning.

[0195] Specifically, if the terminal is instructed to perform a Type 2A UL channel access procedure, the terminal may perform a Type 2A UL channel access procedure for UL transmission. The terminal has at least a sensing interval Transmission can be performed immediately after sensing that the channel is idle. T_ short_ul is duration T f It consists of a single sensing slot immediately following =16us, and T f is T f A sensing slot can be included at the beginning of. T_ short_ul If both sensing slots of are detected as idle, the channel is T_ short_ul It can be considered idle during this time.

[0196] And, the base station has at least a sensing interval T_ short_dl A DL transmission can be performed immediately after sensing a channel that has been idle for 25us. T_ short_dl is duration T f It consists of a single sensing slot immediately after =16us and T f is T f Includes a sensing slot at the beginning of. T_ short_dl If both sensing slots of are detected as idle, the channel is T_ short_dl It can be considered idle during this time.

[0197] In this disclosure, Type 2B SL channel access is like Type 2B DL ​​and / or 2C UL channel access, such as 'T short_sl It has a sensing interval of =25us', and the above sensing interval is 'T f It can be configured with '=16us DURATION' and one or more sensing slots. T f It may be in the form of including a sensing slot at the beginning.

[0198] Specifically, when the terminal is instructed to perform a Type 2B UL channel access procedure, the terminal may perform the Type 2B UL channel access procedure for UL transmission. Immediately after detecting that the channel is idle, T f Transmission can be performed within a period of =16us. T f is T f It may include sensing slots occurring within the last 9us. If a channel is sensed to be idle for a total of at least 5us, with at least 4us of sensing occurring in the sensing slots, the channel is for period T f It can be considered to be in an idle state within.

[0199] And, the base station is T f A DL transmission can be performed immediately after sensing that the channel is idle within a period of 16us. f is T f It may include sensing slots occurring within the last 9us. If the channel is detected to be idle for a total of at least 5us, with at least 4us of sensing occurring in the sensing slots, the channel [is idle] during period T f It can be considered to be in an idle state within.

[0200] In the present disclosure, Type 2C SL channel access may be configured in a form that does not perform channel sensing, such as Type 2C DL and / or 2C UL channel access, and the time interval of SL transmission may be up to 584 µs.

[0201] Specifically, if the terminal is instructed to perform a Type 2C UL channel access procedure for UL transmission, the terminal may not detect the channel before transmission. In this case, the duration of the UL transmission may be up to 584 µs.

[0202] In addition, when the base station performs a Type 2C DL channel access procedure for the transmission of a DL transmission, the base station may not sense the channel before the transmission of the DL transmission. In this case, the duration of the DL transmission may be up to 584us.

[0203] Resource configuration method for performing SL communication

[0204] In NR SL communication, a resource pool is established, and each terminal can perform SL data transmission and reception within the resource pool. Information related to the resource pool can be configured for the terminal through RRC parameters (e.g., 'SL-ResourcePool'). 'SL-ResourcePool' may include one or more RRC parameters as shown in Table 8 below.

[0205] SL-ResourcePool information elementSL-ResourcePool-r16 ::= SEQUENCE {sl-PSCCH-Config-r16 SetupRelease { SL-PSCCH-Config-r16} OPTIONAL, -- Need Msl-PSSCH-Config-r16 SetupRelease { SL-PSSCH-Config-r16} OPTIONAL, -- Need Msl-PSFCH-Config-r16 SetupRelease { SL-PSFCH-Config-r16} OPTIONAL, -- Need Msl-SyncAllowed-r16 SL-SyncAllowed-r16 OPTIONAL, -- Need Msl-SubchannelSize-r16 ENUMERATED {n10, n12, n15, n20, n25, n50, n75, n100} OPTIONAL, -- Need Mdummy INTEGER (10..160) OPTIONAL, -- Need Msl-StartRB-Subchannel-r16 INTEGER (0..265) OPTIONAL, -- Need Msl-NumSubchannel-r16 INTEGER (1..27) OPTIONAL, -- Need Msl-Additional-MCS-Table-r16 ENUMERATED {qam256, qam64LowSE, qam256-qam64LowSE} OPTIONAL, -- Need Msl-ThreshS-RSSI-CBR-r16 INTEGER (0..45) OPTIONAL, -- Need Msl-TimeWindowSizeCBR-r16 ENUMERATED {ms100, slot100} OPTIONAL, -- Need Msl-TimeWindowSizeCR-r16 ENUMERATED {ms1000, slot1000} OPTIONAL, -- Need Msl-PTRS-Config-r16 SL-PTRS-Config-r16 OPTIONAL, -- Need Msl-UE-SelectedConfigRP-r16 SL-UE-SelectedConfigRP-r16 OPTIONAL, -- Need Msl-RxParametersNcell-r16 SEQUENCE {sl-TDD-Configuration-r16 TDD-UL-DL-ConfigCommon OPTIONAL, -- Need Msl-SyncConfigIndex-r16 INTEGER (0..15)} OPTIONAL, -- Need Msl-ZoneConfigMCR-List-r16 SEQUENCE (SIZE (16)) OF SL-ZoneConfigMCR-r16 OPTIONAL, -- Need Msl-FilterCoefficient-r16 FilterCoefficient OPTIONAL, -- Need Msl-RB-Number-r16 INTEGER (10..275) OPTIONAL, -- Need Msl-PreemptionEnable-r16 ENUMERATED {enabled, pl1, pl2, pl3, pl4, pl5, pl6, pl7, pl8} OPTIONAL, -- Need Rsl-PriorityThreshold-UL-URLLC-r16 INTEGER (1..9) OPTIONAL, -- Need Msl-PriorityThreshold-r16 INTEGER (1..9) OPTIONAL, -- Need Msl-X-Overhead-r16 ENUMERATED {n0,n3, n6, n9} OPTIONAL, -- Need Ssl-PowerControl-r16 SL-PowerControl-r16 OPTIONAL, -- Need Msl-TxPercentageList-r16 SL-TxPercentageList-r16 OPTIONAL, -- Need Msl-MinMaxMCS-List-r16 SL-MinMaxMCS-List-r16 OPTIONAL, -- Need M ..., [[ sl-TimeResource-r16 BIT STRING (SIZE (10..160)) OPTIONAL -- Need M ]], [[ sl-PBPS-CPS-Config-r17 SetupRelease { SL-PBPS-CPS-Config-r17} OPTIONAL, -- Need M sl-InterUE-CoordinationConfig-r17 SetupRelease { SL-InterUE-CoordinationConfig-r17} ...}.

[0206] Here, 'sl-NumSubchannel' represents the number of subchannels in the corresponding resource pool consisting only of consecutive PRBs. 'sl-RB-Number' represents the number of PRBs in the corresponding resource pool consisting only of adjacent PRBs, and the remaining RBs cannot be used. 'sl-StartRB-Subchannel SL BWP' represents the lowest RB index of the subchannel having the lowest index in the resource pool relative to the lowest RB index of SL BWP. 'sl-SubchannelSize' represents the minimum granularity of the frequency domain for sensing PSSCH resource selection in PRB units. 'sl-TimeResource' may represent the bitmap of a resource pool defined by periodically repeating the bitmap during an SFN or DFN period. Below, we will describe the method for configuring / setting resource pools and / or subchannels for sidelink communication based on the RB set, which is the basic frequency unit, in performing channel access procedures in an unlicensed band. In addition, the operation of the terminal when the channel access procedure is successful in only some of the RB sets among the sidelink resource areas composed of multiple RB sets will be described.

[0207] FIG. 11 is a diagram illustrating the operation of performing SL communication of a first terminal in a wireless communication system to which the present disclosure may be applied.

[0208] In describing the present disclosure, an RB-interlace (or an RB-unit interlace) comprises RB groups spaced apart at equal intervals within a frequency band, and each RB group may comprise one or more (consecutive) RBs.

[0209] For example, based on the interval M (where M is a natural number greater than or equal to 1) of the RBs constituting the RB-interlace, the m-th RB-interlace can be composed of {m, M+m, 2M+m, ... (k-1)M+m, kM+m} RBs. That is, the m-th RB-interlace can be composed of RBs of the {m, M+m, 2M+m, ... (k-1)M+m, kM+m}-th index (i.e., unit RB group), where m is one of {0, 1, ... , M-1} and k can be a natural number greater than or equal to 1.

[0210] The first terminal (or, transmitting terminal) can receive configuration information (e.g., 'SL-ResourcePool') related to an SL resource pool containing first information related to at least one subchannel from the base station (S1110).

[0211] For example, the first information may include at least one of the number of at least one subchannel of the corresponding resource pool, the lowest RB index of the subchannel having the lowest index in the resource pool for the lowest RB index of the SL BWP, or at least one of the minimum granularity in the frequency domain for sensing PSSCH resource selection in PRB units.

[0212] Here, at least one subchannel may be configured based on at least one resource block (RB)-interlace. That is, the unit constituting the unit subchannel may be an RB-interlace. And, at least one subchannel may be configured on an unlicensed band for sidelink communication.

[0213] In addition, the above configuration information may include the number of at least one RB-interlace and the index of the starting interlace. The size of each of at least one subchannel may be determined based on the number of at least one RB-interlace.

[0214] As another example, configuration information including the number of at least one RB-interlace and the index of a starting interlace, separate from the first information, may be transmitted from the base station to the first terminal.

[0215] In one example of the present disclosure, each index of at least one subchannel may correspond to each index of at least one RB-interlace. That is, one subchannel index may correspond to each index of an RB-interlace composed of a plurality of RB sets.

[0216] In another example of the present disclosure, the index of each of at least one subchannel may correspond to each of at least one RB belonging to a specific RB set among a plurality of RB sets included in at least one RB-interlace.

[0217] For example, some of the indices of at least one subchannel may correspond to each of at least one RB belonging to the first set of RBs among the plurality of RBs included in each of at least one RB-interlace, and the remaining indices of at least one subchannel may correspond to each of at least one RB belonging to the second set of RBs among the plurality of RBs included in each of at least one RB-interlace.

[0218] As another example, the index of the first subchannel among at least one subchannel corresponds to at least one RB belonging to the first set of RBs among a plurality of RBs included in the first RB-interlace, and the index of the second subchannel among at least one subchannel corresponds to at least one RB belonging to the second set of RBs among a plurality of RBs included in the second RB-interlace.

[0219] The first terminal can transmit sidelink control information (SCI) indicating the index of a specific subchannel among at least one subchannel to the second terminal (S1120).

[0220] Here, a specific subchannel may be indicated through a frequency resource assignment field included in the SCI. The first terminal may transmit sidelink data to the second terminal (or receiving terminal) based on the SCI (via the specific subchannel).

[0221] At this time, the sidelink data may include SL signals / channels such as a physical sidelink shared channel (PSSCH).

[0222] In one example of the present disclosure, if the channel access procedure for a third RB set among at least one RB set corresponding to a specific subchannel is unsuccessful, the first terminal may not transmit sidelink data to the second terminal through the specific subchannel. That is, if the channel access procedure for even some of the at least one RB set corresponding to a specific subchannel is unsuccessful, the first terminal may drop the sidelink data.

[0223] Successful channel access procedure for an RB set may imply that transmission is permitted within that RB set as a result of channel sensing. Here, the channel access procedure refers to a sensing-based procedure that evaluates the availability of a channel for performing transmission. The basic unit of sensing is a duration T sl It is a sensing slot with a value of 9us.

[0224] Specifically, if a base station / terminal (e.g., a first terminal / a second terminal) senses a channel during a sensing slot period and determines that the power detected for at least 4us within the sensing slot period is less than an energy detection threshold, the sensing slot period T slIt may be considered idle. Otherwise (i.e., if the base station / terminal determines that the power detected for at least 4us within the sensing slot period is above the energy detection threshold), the sensing slot period T_{sl} may be considered busy.

[0225] As another example, if the channel access procedure for the third RB set among at least one RB set corresponding to a specific subchannel is successful, the first terminal can transmit sidelink data to the second terminal through the third RB set. At this time, the entire information regarding the sidelink data can be mapped to the third RB set.

[0226] As another example, information regarding the same sidelink data can be mapped to the entire set of at least one RB corresponding to a specific subchannel. That is, even if the channel access procedure is not successful for some of the at least one set of RBs, the first terminal can transmit sidelink data to the second terminal based on the set of RBs for which the channel access procedure was successful.

[0227] FIG. 12 is a diagram illustrating the operation of performing SL communication of a second terminal in a wireless communication system to which the present disclosure may be applied.

[0228] The second terminal can receive sidelink control information (SCI) from the first terminal that indicates the index of a specific subchannel among at least one subchannel (S1210). At this time, the SCI can be transmitted from the first terminal to the second terminal via PSCCH.

[0229] At least one subchannel may be configured based on the index of at least one RB-interlace. At least one subchannel may be configured based on configuration information related to an SL resource pool received from a base station. The configuration information may include the number of at least one RB-interlace and the index of a starting interlace.

[0230] The second terminal can receive sidelink data from the first terminal based on SCI (S1220).

[0231] The operation of transmitting a side link from the first terminal to the second terminal has been explained with reference to FIG. 11, so a redundant explanation will be omitted.

[0232] In the following, regarding the execution of the channel access procedure in an unlicensed band, i) a method for configuring / setting a resource pool and / or subchannel of sidelink communication based on RB sets and ii) the operation of the terminal when the channel access procedure is successful only in a specific set of RB sets will be described in detail.

[0233] Example 1

[0234] Example 1 relates to a method for setting up a resource pool and / or subchannel based on RB sets. By reusing the settings from basic SL communication as much as possible, a frequency range of the resource pool that is not limited to RB sets can be set up. That is, the frequency range of the resource pool may be allowed to overlap with multiple RB sets.

[0235] For example, a resource pool consisting of 100 RBs can be configured within an SL BWP in an unlicensed band with a 30 kHz SCS configured, and the 100 RBs can overlap with two sets of RBs.

[0236] A resource pool configuration method that is not limited to RB sets, as described above, may not be desirable when considering unlicensed band operations where independent channel sensing is performed for each RB set. This is because even if a resource pool that overlaps with two RB sets is configured, the idle / busy status of the channels for each RB set may differ, and thus the transmission capability for each RB set may differ.

[0237] Therefore, frequency domain resources of a resource pool set in an unlicensed band may be set within one set of RBs. For example, if 51 sets of RBs are set within an SL BWP in an unlicensed band where a 30 kHz SCS is set, a rule may be established that the SL resource pool set in the BWP consists of 51 RBs or fewer.

[0238] Additionally or alternatively, a rule may be established that frequency domain resources of a resource pool set in an unlicensed band are set to be identical to one set of RBs.

[0239] As another example, if the RB set within an SL BWP in an unlicensed band with a 30 kHz SCS is set to 51 RBs, a rule can be established that the SL resource pool set in that BWP consists only of 51 RBs.

[0240] Example 1-1

[0241] In relation to unlicensed bands, there may be regulations regarding restrictions on the size of the frequency occupied area / occupied channel bandwidth (OCB) and / or power spectral density (PSD) depending on the region.

[0242] For example, there may be constraints that at least 80% of the frequency range of the operating frequency bandwidth must be occupied in relation to the unlicensed band, or / and that the PSD per 1 MHz must be kept below a certain value. Taking this into consideration, an interlace-based frequency axis resource allocation method may be applied to NR-U link communication over the unlicensed band.

[0243] Specifically, multiple interlacs of RBs can be defined. An interlac m∈{0, 1, ... M-1} can be composed of common resource blocks {m, M+m, 2M+m, 3M+m, ...}, where M represents the interval between RBs constituting the RB-interlac given by Table 9.

[0244] μ M 0 10 1 5

[0245] Interlaced resource blocks of BWP i and interlaced m ( ) and common resource blocks( The relationship between ) can be given as in mathematical equation 3.

[0246]

[0247] represents a common resource block where the bandwidth portion starts based on common resource block 0. If there is no risk of confusion, index μ may be dropped. The terminal can expect the number of common resource blocks in the interlaced BWP i to be 10 or more.

[0248] When the interlaced structure described above is also applied to unlicensed band sidelink communication, the subchannel can be configured in RB-interlaced units (within one RB set).

[0249] For example, when an unlicensed band SL BWP set to 30 kHz SCS is set to 51 RBs (i.e., 1 set of RBs) (or when the frequency axis resource SL resource pool is set to 51 RBs), one RB-interlace can be composed of 10 or 11 RBs as intervals of 5 RBs (i.e., the M value in Table 8) are applied.

[0250] For example, an RB-interlace consisting of 11 RBs can be configured as {RB INDEX #0, RB INDEX #5, RB INDEX #10, ..., RB INDEX #50}, and an RB-interlace consisting of 10 RBs can be configured as {RB INDEX#1, RB INDEX#6, RB INDEX #11, ..., RB INDEX #46}.

[0251] Examples 1-2

[0252] As a specific method for configuring subchannels, the subchannel size is determined through the number of RB-interlaces, and a starting RB-interlace index can be additionally set.

[0253] For example, a resource of a subchannel frequency domain (or axis) in which the Starting RB-interlace index is set to 0 and the number of RB-interlaces is set to 2 may be the union of a frequency domain (or axis) resource corresponding to RB-interlace INDEX #0 and a frequency domain (or axis) resource corresponding to RB-interlace INDEX #1.

[0254] As another example, when a resource pool (or SL BWP) composed of multiple RB sets is configured, the following two options may be considered.

[0255] Option 1: A single subchannel index can be configured to correspond to each RB-interlace index composed of multiple sets of RBs (such as the RB-interlace structure in an NR-Uu link in an unlicensed band).

[0256] Option 2: A single subchannel index can be configured to correspond separately to RBs confined within one set of RBs in a specific RB-interlace.

[0257] For Option 2, depending on the indexing method between RB-interlace and subchannels, it can be divided into the following three options.

[0258] Option 2-1: After completing indexing between RB-interlace and subchannels for RBs restricted to a specific set of RBs among the RBs belonging to RB-interlace, indexing between RB-interlace and subchannels can be performed for RBs restricted to the next set of RBs.

[0259] For example, assume that five RB-interlaces (e.g., RB-interlace indices #0 / #1 / #2 / #3 / #4) are configured. Among the RB-interlace indices #0 / #1 / #2 / #3 / #4, each RB belonging to RB set index #0 can be mapped to each subchannel index #0 / #1 / #2 / #3 / #4. Additionally, among the RB-interlace indices #0 / #1 / #2 / #3 / #4, each RB belonging to RB set index #1 can be mapped to each subchannel index #5 / #6 / #7 / #8 / #9 for indexing.

[0260] Option 2-2: RB-interlaces can be indexed by hopping RB sets.

[0261] For example, assume that three sets of RBs are configured and five RB-interlaces are configured in each set of RBs. Among the RBs belonging to RB-interlace index #0, the RBs belonging to RB set index #0 can first be mapped to subchannel index #0. Then, among the RBs belonging to RB-interlace index #0, the RBs belonging to RB set index #1 can be indexed by mapping them to subchannel index #1.

[0262] Option 2-3: Indexing between RB-interlace and subchannels is performed on RBs limited to one set of RBs among the RBs belonging to RB-interlace, and individual subchannel indexing can be performed for each set of RBs.

[0263] For example, assume that five RB-interlaces are configured. Among the RB-interlace indices #0 / #1 / #2 / #3 / #4, subchannel indices #0 / #1 / #2 / #3 / #4 can be mapped to each RB belonging to RB set index #0. And, among the RB-interlace indices #0 / #1 / #2 / #3 / #4, subchannel indices #0 / #1 / #2 / #3 / #4 can be mapped to each RB belonging to RB set index #1.

[0264] For Option 1 or / and Option 2-3, the subchannel index and / or RB set index may be indicated through the frequency resource assignment field of SCI format 1-A. Additionally or alternatively, a consecutive RB set index may be indicated in a RIV manner, and an RB set index may be indicated in a bitmap manner.

[0265] For Option 2-1 or / and Option 2-2, the subchannel index may be indicated via the frequency resource allocation field of SCI format 1-A. Additionally or alternatively, the subchannel indexes may be indicated via RIV or bitmap methods.

[0266] Examples 1-3

[0267] Subchannels can be configured in units of RB sets. As a method for configuring subchannels, the subchannel size is determined based on the number of RB sets, and a starting RB set index can be additionally configured.

[0268] For example, the frequency domain resources of a subchannel in which the starting RB set index is set to 1 and the number of RB sets is set to 2 may be the union of the frequency axis resources corresponding to RB set INDEX #1 and the frequency axis resources corresponding to RB set INDEX #2 (and / or RBs corresponding to the intra-cell guard band between the consecutive RB sets).

[0269] Additionally or alternatively, if the subchannel size is set to the number of RBs, the maximum subchannel size and / or the allocation location of the subchannel may be determined according to the size of the RB set per SCS. For example, if the size of the frequency axis region of the resource pool is limited to within a single RB set, the maximum subchannel size may be defined differently according to the SCS.

[0270] For example, assume that for a 15 kHz SCS, up to 100 RBs can be set within one RB set, and for a 30 kHz SCS, up to 50 RBs can be set within one RB set. In this case, the maximum number of RBs in the resource pool size that can be set is 100 RBs for the 15 kHz SCS and 50 RBs for the 30 kHz SCS.

[0271] As another example, when the maximum subchannel size can be set equally regardless of the SCS, the subchannel (having the maximum size or each) can be restricted to overlap with the minimum set of RBs.

[0272] For example, if a 30 kHz SCS SL BWP with an 80 MHz bandwidth is configured and a subchannel with 75 RB sizes is configured, the subchannel may be configured to overlap up to 3 sets of RBs. If a constraint is defined to minimize the number of overlapping sets of RBs (considering that channel sensing is performed per set of RBs), the constraint may be defined to configure the subchannel to overlap with 2 sets of RBs.

[0273] That is, when 75 RB-sized subchannels are configured for a 30 kHz SCS SL BWP, the terminal can expect that the subchannels are configured to overlap with 2 sets of RBs. And, the terminal can assume that any subchannels not configured as described above (e.g., subchannels configured to overlap with 3 sets of RBs) are invalid.

[0274] Example 2

[0275] Example 2 relates to the operation of a terminal considering the success or failure of a channel access procedure for each RB set.

[0276] SL signals / channels, such as PSSCH / PSCCH transmitted by the terminal, may be set / scheduled across multiple RB sets. In this case, if the channel access procedure is successful only in some RB sets, transmission may be allowed only in those RB set(s). The following describes the operation of the terminal when the channel access procedure is successful only in some RB sets.

[0277] Example 2-1

[0278] It is assumed that at the time of transmission of an SL signal / channel (e.g., PSSCH, PSCCH, SL CSI-RS, SL DM-RS, etc.) that overlaps multiple RB sets, the channel access procedure is not successful in at any of the RB sets. In this case, to simplify / reduce the implementation complexity of the terminal, a rule may be defined to drop the entire SL signal / channel and not transmit it.

[0279] Additionally or alternatively, if at least some of the RB sets succeed in the channel access procedure during the SL signal / channel transmission time when multiple RB sets overlap, transmission to the SL signal / channel may be allowed even at the RB set (or some of the RB sets) that succeeded in the channel access procedure.

[0280] At this time, a condition may be set / defined that the transmission RB set must contain specific channel / information. For example, if the channel access procedure for the RB set(s) containing PSCCH (or / and 2nd-stage SCI) is successful, transmission to the SL signal / channel may be allowed.

[0281] For example, assume a terminal performing channel sensing for a PSSCH / PSCCH transmission overlapping RB sets #0 / #1 / #2 that succeeded in the channel access procedure on RB sets #0 / #1 but failed on RB set #2 at the time of transmission. The terminal can perform a transmission for RB set #0 (or / and RB set #1 (without PSCCH)) where all RBs corresponding to PSCCH are restricted.

[0282] In this case, the terminal may transmit only PSCCH and not transmit other SL signals / channels. Additionally or alternatively, a rule may be defined (or performed by the terminal implementation) to transmit all SL signals / channels mapped to RB set #0 (or / and RB set #1) on which the terminal performs transmission (or / and all SL signals / channels mapped to RB set(s) on which transmission is not performed are dropped).

[0283] Example 2-2

[0284] It is assumed that the channel access procedure is successful in at least some of the RB sets during the SL signal / channel transmission time when multiple RB sets overlap.

[0285] If transmission to the SL signal / channel is allowed in the RB set (or some RB sets) that have succeeded in the channel access procedure, the same SL signal / channel may be set for each RB set to minimize the impact caused by the RB set that is not actually transmitted.

[0286] For example, a terminal performing channel sensing to perform PSCCH / PSSCH transmission over a subchannel overlapping RB sets #0 / #1 / #2 can map the same PSCCH information for each RB set. For example, the terminal can map the same PSCCH consisting of 20 RBs and 2 symbols for each RB set #0 / #1 / #2.

[0287] According to the method described above, if the channel access procedure is successful (in some RB sets) and an SL signal / channel (e.g., PSSCH) is transmitted in the RB sets, at least the SL signal channel (e.g., PSCCH) can be transmitted without loss.

[0288] As another example, a terminal performing channel sensing to perform PSCCH / PSSCH transmission through a subchannel overlapping RB sets #0 / #1 / #2 can map the same 2nd-stage SCI information for each RB set.

[0289] According to the method described above, even if any set of RBs is transmitted after the channel access procedure is successful (in some sets of RBs), at least the 2nd-stage SCI can be transmitted without loss.

[0290] As another example, a terminal performing channel sensing for PSCCH / PSSCH transmission through a subchannel overlapping RB sets #0 / #1 / #2 can map the same PSSCH information for each RB set (or / and map the RV differently even if the same TB information is carried for each RB set).

[0291] According to the method described above, even if some RB sets are transmitted after the channel access procedure (in some RB sets) is successful, at least PSSCH can be transmitted without loss.

[0292] As another example, a terminal performing channel sensing for PSCCH / PSSCH transmission through a subchannel overlapping RB sets #0 / #1 / #2 can map the same CSI feedback information for each RB set.

[0293] According to the method described above, even if some RB sets are transmitted after the channel access procedure is successful (in some RB sets), at least the CSI feedback information can be transmitted without loss.

[0294] FIG. 13 is a diagram illustrating a signaling procedure for a first terminal, a second terminal, and a network side according to one embodiment of the present disclosure.

[0295] FIG. 13 illustrates an example of signaling between a device and a terminal in an M-TRP situation to which the examples of the above-described disclosure (e.g., Example 1, Example 1-1, Example 1-2, Example 1-3, Example 2, Example 2-1, Example 2-2 or / and a combination of one or more of the detailed examples thereof) may be applied.

[0296] Here, the terminal / device is exemplary and can be replaced with various devices as described with reference to FIG. 14. FIG. 13 is for convenience of explanation and is not intended to limit the scope of the present disclosure. Also, some step(s) shown in FIG. 13 may be omitted depending on the situation and / or settings, etc. Additionally, in the operation of the device / terminal of FIG. 13, the aforementioned uplink transmission / reception operation, M-TRP related operation, etc. may be referenced or utilized.

[0297] Here, the network side may be a single base station including multiple TRPs, or a single cell including multiple TRPs. Alternatively, the network side may include multiple RRHs (remote radio heads) / RRUs (remote radio units).

[0298] For example, an ideal / non-ideal backhaul may be established between TRP 1 and TRP 2 that constitute the network side. Additionally, although the following description is based on multiple TRPs, it can be extended and applied equally to transmission through multiple panels / cells and to transmission through multiple RRH / RRUs, etc.

[0299] In addition, the following description is based on "TRP," but as described above, "TRP" can be replaced with expressions such as panel, antenna array, cell (e.g., macro cell / small cell / pico cell, etc.), TP (transmission point), base station (gNB, etc.). As described above, TRP can be distinguished according to information about the CORESET group (or CORESET pool) (e.g., CORESET index, ID).

[0300] For example, if a single terminal is configured to transmit and receive with multiple TRPs (or cells), this may mean that multiple CORESET groups (or CORESET pools) are configured for that single terminal. Configuration of such CORESET groups (or CORESET pools) can be performed through upper-layer signaling (e.g., RRC signaling).

[0301] In addition, the term "base station" may refer collectively to an object that performs data transmission and reception with a terminal. For example, the base station may be a concept that includes one or more Transmission Points (TPs), one or more Transmission and Reception Points (TRPs), etc. Additionally, the TPs and / or TRPs may include the base station's panels, transmission and reception units, etc.

[0302] The first terminal can receive configuration information from the network side (S105).

[0303] For example, the above configuration information may include information related to network-side configuration (i.e., TRP configuration), resource allocation information related to M-TRP-based transmission and reception, etc. The above configuration information may be transmitted through upper layers (e.g., RRC, MAC CE). The above configuration information may include information related to uplink transmission based on a configured grant (CG). Additionally, if the above configuration information is predefined or configured, the corresponding step may be omitted.

[0304] As another example, the above configuration information may include information related to the SL resource pool (e.g., 'SL-ResourcePool'). The information related to the SL resource pool may include information indicating the number of subchannels of the corresponding resource pool, information indicating the bitmap of the resource pool, information indicating the minimum granularity of the frequency domain for sensing PSSCH resource selection in PRB units, information indicating the number of PRBs of the corresponding resource pool, information indicating the starting RB, etc.

[0305] As another example, the above setting information may include information for setting an SL BWP. The terminal and / or device may transmit and receive an SL channel / signal on the SL BWP set by the above setting information.

[0306] As another example, the above configuration information may include information related to at least one subchannel configured based on RB interlacing. For example, the above configuration information may include information regarding the number of RB interlacings, the starting RB-interlacing index, etc.

[0307] Here, a frequency axis resource region for SL transmission may be established based on the examples of the present disclosure (e.g., Example 1, Example 1-1, Example 1-2, Example 1-3, Example 2, Example 2-1, Example 2-2 or / and a combination of one or more of the detailed examples thereof).

[0308] For example, the operation of the first terminal (100 or 200 in FIG. 14) of the above-described step S105 receiving the configuration information from the network side can be implemented by the device of FIG. 14 to be described below. For example, referring to FIG. 14, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104, etc. to receive the configuration information, and one or more transceivers 106 can receive the configuration information from the network side.

[0309] The first terminal can transmit sidelink control information (SCI) to the second terminal device (S110).

[0310] For example, SCI is 1 st -stage SCI and 2 nd It is classified as a -stage SCI, and the first terminal is (continuous) 1 st -stage SCI and / or 2 nd -stage SCI can be transmitted to the second terminal. 1 st -stage SCI can include SCI format 1-A, and 2 nd The -stage SCI format may include SCI format 2-A and / or SCI format 2-B. SCI format 1-A is used when scheduling PSSCH, and SCI format 2-A and SCI format 2-B may be used when decoding PSSCH.

[0311] As another example, the SCI may include information (e.g., a frequency resource allocation field) indicating a specific subchannel among at least one subchannel (set by configuration information). Additionally, if the SCI is predefined or configured, that step may be omitted.

[0312] For example, the operation of the first terminal (100 or 200 in FIG. 14) of the above-described step S110 transmitting the SCI to the second terminal (200 or 100 in FIG. 14) can be implemented by the device of FIG. 13, which will be described below. For example, referring to FIG. 14, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104, etc. to transmit the SCI, and one or more transceivers 106 can transmit the SCI to the second terminal.

[0313] The first terminal can transmit an SL signal / channel to the second terminal or receive it from the second terminal (S115).

[0314] The first terminal can transmit an SL signal / channel scheduled based on SCI to the second terminal or receive it from the second terminal. At this time, the first terminal can transmit / receive the SL signal / channel based on whether the channel access procedure was successful for each RB set.

[0315] For example, assume a case where an SL signal / channel, such as PSSCH / PSCCH, is scheduled across multiple sets of RBs. For example, if the channel access procedure is not successful in some of the multiple sets of RBs, the first terminal may drop the entire SL signal / channel. For another example, if the channel access procedure is successful in some of the multiple sets of RBs and the SL signal / channel is fully contained in those sets of RBs, the first terminal may transmit the SL signal / channel from those sets of RBs to the second terminal. For yet another example, the first terminal may map the same SL signal / channel information to the sets of RBs where the channel access procedure was successful.

[0316] For example, the operation of the first terminal (100 or 200 in FIG. 14) of the above-described step S115 transmitting an SL signal / channel to the second terminal (200 or 100 in FIG. 14) or receiving an SL signal / channel from the second terminal (200 or 100 in FIG. 14) can be implemented by the device of FIG. 14 to be described below.

[0317] For example, referring to FIG. 14, one or more processors 102 can control one or more transceivers 106 and / or one or more memories 104, etc. to transmit or receive an SL signal / channel, and one or more transceivers 106 can transmit an SL signal / channel to a second terminal or receive an SL signal / channel from the second terminal.

[0318] General devices to which the present disclosure may be applied

[0319] FIG. 14 illustrates a block diagram of a wireless communication device according to one embodiment of the present disclosure.

[0320] Referring to FIG. 14, the first device (100) and the second device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR).

[0321] The first device (100) includes one or more processors (102) and one or more memories (104), and may additionally include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memory (104) and / or transceivers (106) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or sequences of operation disclosed in this disclosure.

[0322] For example, the processor (102) can process information within the memory (104) to generate a first information / signal and then transmit a wireless signal containing the first information / signal through the transceiver (106). Additionally, the processor (102) can receive a wireless signal containing a second information / signal through the transceiver (106) and then store information obtained from the signal processing of the second information / signal in the memory (104).

[0323] The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may store software code containing instructions for performing some or all of the processes controlled by the processor (102) or for performing the descriptions, functions, procedures, proposals, methods, and / or sequences of operation disclosed in this disclosure. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals through one or more antennas (108). The transceiver (106) may include a transmitter and / or receiver. The transceiver (106) may be combined with an RF (Radio Frequency) unit. In the present disclosure, the device may refer to a communication modem / circuit / chip.

[0324] The second device (200) includes one or more processors (202) and one or more memories (204), and may additionally include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memory (204) and / or transceivers (206) and may be configured to implement the descriptions, functions, procedures, proposals, methods and / or sequences of operation disclosed in this disclosure. For example, the processor (202) may process information within the memory (204) to generate a third information / signal and then transmit a wireless signal containing the third information / signal through the transceiver (206). Additionally, the processor (202) may receive a wireless signal containing a fourth information / signal through the transceiver (206) and then store information obtained from the signal processing of the fourth information / signal in the memory (204). Memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, memory (204) may store software code including instructions for performing some or all of the processes controlled by the processor (202) or for performing the descriptions, functions, procedures, proposals, methods, and / or sequences of operation disclosed in this disclosure. Here, the processor (202) and memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). A transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals through one or more antennas (208). The transceiver (206) may include a transmitter and / or receiver. The transceiver (206) may be interchangeable with an RF unit. In this disclosure, the term "device" may refer to a communication modem / circuit / chip.

[0325] Hereinafter, hardware elements of the device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this disclosure. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this disclosure. One or more processors (102, 202) may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the functions, procedures, proposals, and / or methods disclosed in this disclosure and provide it to one or more transceivers (106, 206). One or more processors (102, 202) may receive a signal (e.g., a baseband signal) from one or more transceivers (106, 206) and may obtain a PDU, SDU, message, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this disclosure.

[0326] One or more processors (102, 202) may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or flowcharts disclosed in this disclosure may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this disclosure may be included in one or more processors (102, 202) or stored in one or more memories (104, 204) and driven by one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operation sequences disclosed in this disclosure may be implemented using firmware or software in the form of code, instructions, and / or sets of instructions.

[0327] One or more memories (104, 204) may be connected to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories (104, 204) may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer read storage media, and / or combinations thereof. One or more memories (104, 204) may be located inside and / or outside of one or more processors (102, 202). Additionally, one or more memories (104, 204) may be connected to one or more processors (102, 202) through various technologies such as wired or wireless connections.

[0328] One or more transceivers (106, 206) may transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or operation flowcharts, etc., of the present disclosure to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or operation flowcharts, etc., disclosed in the present disclosure from one or more other devices. For example, one or more transceivers (106, 206) may be connected to one or more processors (102, 202) and may transmit and receive wireless signals. For example, one or more processors (102, 202) may control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, proposals, methods, and / or flowcharts of operation disclosed in this disclosure through one or more antennas (108, 208). In this disclosure, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert the received wireless signal / channel, etc. from an RF band signal to a baseband signal in order to process the received user data, control information, wireless signal / channel, etc. using one or more processors (102, 202).One or more transceivers (106, 206) can convert user data, control information, wireless signals / channels, etc. processed using one or more processors (102, 202) from baseband signals to RF band signals. To this end, one or more transceivers (106, 206) may include (analog) oscillators and / or filters.

[0329] The embodiments described above are combinations of the components and features of the present disclosure in a specific form. Each component or feature should be considered optional unless otherwise explicitly stated. Each component or feature may be implemented in a form not combined with other components or features. Additionally, it is possible to construct embodiments of the present disclosure by combining some components and / or features. The order of operations described in the embodiments of the present disclosure may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that embodiments may be constructed by combining claims that are not explicitly related in the claims, or that they may be included as new claims by amendment after filing.

[0330] It is obvious to those skilled in the art that the present disclosure may be embodied in other specific forms without departing from the essential features of the present disclosure. Accordingly, the detailed description set forth above should not be interpreted restrictively in all respects and should be considered exemplary. The scope of the present disclosure shall be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present disclosure are included within the scope of the present disclosure.

[0331] The scope of the present disclosure includes software or machine-executable instructions (e.g., operating systems, applications, firmware, programs, etc.) that enable operations according to the methods of various embodiments to be executed on a device or computer, and a non-transitory computer-readable medium on which such software or instructions, etc. are stored and executable on a device or computer. Instructions that may be used to program a processing system to perform the features described in the present disclosure may be stored on or within a storage medium or a computer-readable storage medium, and the features described in the present disclosure may be implemented using a computer program product comprising such a storage medium. The storage medium may include, but is not limited to, high-speed random access memory such as DRAM, SRAM, DDR RAM, or other random access solid-state memory devices, and may include non-volatile memory such as one or more magnetic disk storage devices, optical disk storage devices, flash memory devices, or other non-volatile solid-state storage devices. The memory may optionally include one or more storage devices located remotely from the processor(s). Memory or alternatively, non-volatile memory device(s) within memory comprises a non-transient computer-readable storage medium. The features described in this disclosure may be stored in any one of the machine-readable media and integrated into software and / or firmware that can control the hardware of a processing system and allow the processing system to interact with other mechanisms utilizing results according to the embodiments of this disclosure. Such software or firmware may include, but is not limited to, application code, device drivers, operating systems, and execution environments / containers.

[0332] Here, the wireless communication technology implemented in the device (100, 200) of the present disclosure may include LTE, NR, and 6G, as well as Narrowband Internet of Things for low-power communication. In this case, for example, NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology and may be implemented according to standards such as LTE Cat NB1 and / or LTE Cat NB2, but is not limited to the names mentioned above. Additionally or generally, the wireless communication technology implemented in the device (100, 200) of the present disclosure may perform communication based on LTE-M technology. In this case, for example, LTE-M technology may be an example of LPWAN technology and may be referred to by various names such as eMTC (enhanced Machine Type Communication). For example, LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the names mentioned above. Additionally or generally, wireless communication technology implemented in the device (100, 200) of the present disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) for low-power communication, and is not limited to the names mentioned above. As an example, ZigBee technology may create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.

[0333] Although the method proposed in this disclosure has been described with an example applied to 3GPP LTE / LTE-A and 5G systems, it can be applied to various wireless communication systems in addition to 3GPP LTE / LTE-A and 5G systems.

Claims

Claim 1 A step of receiving configuration information related to an SL resource pool containing first information related to at least one subchannel from a base station by a first terminal; A method comprising the step of transmitting sidelink control information (SCI) indicating an index of a specific subchannel among at least one subchannel to a second terminal by the first terminal, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information includes the number of the at least one RB-interlace and an index of a starting interlace, wherein sidelink data is not transmitted to the second terminal through the specific subchannel based on the fact that a channel access procedure for a specific RB set among at least one RB set corresponding to the specific subchannel is unsuccessful, and sidelink data is transmitted to the second terminal through the specific RB set by the first terminal based on the fact that a channel access procedure for the specific RB set among at least one RB set corresponding to the specific subchannel is successful, and information regarding the sidelink data is mapped to the specific RB set. Claim 2 A method according to claim 1, wherein each index of the at least one subchannel corresponds to each index of the at least one RB-interlace. Claim 3 A method according to claim 1, wherein the index of each of the at least one subchannel corresponds to each of at least one RB belonging to a specific RB set among a plurality of RB sets included in the at least one RB-interlace. Claim 4 A method according to claim 1, wherein the index of some of the at least one subchannel corresponds to each of at least one RB belonging to a first set of RBs among a plurality of RBs included in each of the at least one RB-interlace, and the index of the remainder of the at least one subchannel corresponds to each of at least one RB belonging to a second set of RBs among a plurality of RBs included in each of the at least one RB-interlace. Claim 5 A method according to claim 1, wherein the index of the first subchannel among the at least one subchannel corresponds to at least one RB belonging to the first set of RBs among a plurality of RBs included in the first RB-interlace, and the index of the second subchannel among the at least one subchannel corresponds to at least one RB belonging to the second set of RBs among a plurality of RBs included in the second RB-interlace. Claim 6 A method according to claim 1, wherein the specific subchannel is indicated through a frequency resource assignment field included in the SCI, and sidelink data is transmitted from the first terminal to the second terminal through the specific subchannel. Claim 7 A method according to claim 1, wherein the size of each of the at least one subchannel is determined based on the number of the at least one RB-interlace. Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 A method according to claim 1, wherein the sidelink data transmitted by the first terminal to the second terminal based on the SCI comprises a physical sidelink shared channel (PSSCH). Claim 12 A method according to claim 1, wherein at least one subchannel is set on an unlicensed band for sidelink communication. Claim 13 A method according to claim 1, wherein, based on the spacing of the RBs constituting the at least one RB-interlace being M, the m-th RB-interlace is composed of {m, M+m, 2M+m, ... (k-1)M+m, kM+m} RBs, wherein m is one of {0, 1, ... , M-1} and k is a natural number greater than or equal to 1. Claim 14 In a first terminal, the first terminal comprises: one or more transceivers; and one or more processors connected to the one or more transceivers, wherein the one or more processors receive configuration information related to an SL resource pool containing first information related to at least one subchannel from a base station through the one or more transceivers; A terminal configured to transmit sidelink control information (SCI) indicating the index of a specific subchannel among the at least one subchannel to a second terminal through the one or more transceivers, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information includes the number of the at least one RB-interlace and the index of a starting interlace, wherein sidelink data is not transmitted to the second terminal through the specific subchannel based on the fact that a channel access procedure for a specific RB set among at least one RB set corresponding to the specific subchannel is unsuccessful, and sidelink data is transmitted to the second terminal by the first terminal through the specific RB set based on the fact that a channel access procedure for the specific RB set among at least one RB set corresponding to the specific subchannel is successful, and information regarding the sidelink data is mapped to the specific RB set. Claim 15 A step of receiving sidelink control information (SCI) indicating the index of a specific subchannel among at least one subchannel from a first terminal by a second terminal; A method comprising the step of receiving sidelink data from the first terminal by the second terminal based on the above SCI, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the at least one subchannel is configured based on configuration information related to an SL resource pool, wherein the configuration information includes the number of the at least one RB-interlace and the index of the starting interlace, and based on the fact that a channel access procedure for a specific RB set among at least one RB set corresponding to the specific subchannel is unsuccessful, the sidelink data is not transmitted to the second terminal through the specific subchannel, and based on the fact that a channel access procedure for the specific RB set among at least one RB set corresponding to the specific subchannel is successful, the sidelink data is transmitted to the second terminal by the first terminal through the specific RB set, and information regarding the sidelink data is mapped to the specific RB set. Claim 16 In a second terminal, the second terminal comprises: one or more transceivers; and one or more processors connected to the one or more transceivers, wherein the one or more processors receive sidelink control information (SCI) indicating the index of a specific subchannel among at least one subchannel from the first terminal through the one or more transceivers; A second terminal configured to receive sidelink data from the first terminal through the one or more transceivers based on the above SCI, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the at least one subchannel is configured based on configuration information related to an SL resource pool, wherein the configuration information includes the number of the at least one RB-interlace and the index of the starting interlace, and wherein, based on the fact that the channel access procedure for the specific RB set among the at least one RB set corresponding to the specific subchannel is unsuccessful, the sidelink data is not transmitted to the second terminal through the specific subchannel, and based on the fact that the channel access procedure for the specific RB set among the at least one RB set corresponding to the specific subchannel is successful, the sidelink data is transmitted to the second terminal by the first terminal through the specific RB set, and information regarding the sidelink data is mapped to the specific RB set. Claim 17 A processing device configured to control a first terminal, wherein the processing device comprises: one or more processors; and one or more computer memories operably connected to the one or more processors and storing instructions for performing operations based on execution by the one or more processors, wherein the operations include: receiving configuration information related to an SL resource pool containing first information related to at least one subchannel from a base station; A processing device comprising the operation of transmitting sidelink control information (SCI) indicating the index of a specific subchannel among the at least one subchannel to a second terminal, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information includes the number of the at least one RB-interlace and the index of a starting interlace, wherein sidelink data is not transmitted to the second terminal through the specific subchannel based on the fact that a channel access procedure for a specific RB set among at least one RB set corresponding to the specific subchannel is unsuccessful, and sidelink data is transmitted to the second terminal by the first terminal through the specific RB set based on the fact that a channel access procedure for the specific RB set among at least one RB set corresponding to the specific subchannel is successful, and information regarding the sidelink data is mapped to the specific RB set. Claim 18 One or more non-transitory computer-readable storage media storing one or more commands, wherein the one or more commands are executed by one or more processors, and the device: receives from a base station configuration information associated with an SL resource pool containing first information associated with at least one subchannel; A computer-readable storage medium that is controlled to transmit sidelink control information (SCI) indicating an index of a specific subchannel among the at least one subchannel to a second terminal, wherein the at least one subchannel is configured based on at least one resource block (RB)-interlace, and the configuration information includes the number of the at least one RB-interlace and an index of a starting interlace, wherein sidelink data is not transmitted to the second terminal through the specific subchannel based on the fact that a channel access procedure for a specific RB set among at least one RB set corresponding to the specific subchannel is unsuccessful, and sidelink data is transmitted to the second terminal through the specific RB set based on the fact that a channel access procedure for the specific RB set among at least one RB set corresponding to the specific subchannel is successful, and information regarding the sidelink data is mapped to the specific RB set.

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