CP extension method and apparatus for NR sidelink transmission over unlicensed spectrum

Abstract

A method for operating a first device 100 in a wireless communication system is proposed, the method including the steps of: performing channel sensing for CAP on a first resource on a shared spectrum; and performing SL transmission based on the channel sensing result being idle and on the first resource, where a CP extension is applied to the first resource and based on an SCS associated with the SL transmission being 60 kHz, a maximum number of symbols used for the CP extension is 2.

Description

[Technical Field]

[0001] The present disclosure relates to wireless communication systems. [Background technology]

[0002] Sidelink (SL) is a communication method that establishes a direct link between terminals (User Equipment, UE) and directly exchanges voice or data between terminals without going through a base station (BS). SL is being considered as a solution to alleviate the burden on base stations due to the rapidly increasing data traffic. V2X (vehicle-to-everything) is a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-based objects, etc. via wired or wireless communication. V2X can be divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication can be provided via the PC5 interface and / or Uu interface.

[0003] Meanwhile, as more and more communication devices require larger communication capacities, there is an emerging need for improved mobile broadband communication compared to existing radio access technologies (RATs). As a result, communication systems that take into account reliability- and latency-sensitive services or terminals are being discussed, and next-generation wireless access technologies that take into account improved mobile broadband communication, massive machine-type communication (MTC), ultra-reliable and low latency communication (URLLC), etc. can be called new radio access technology (RAT) or new radio (NR). Summary of the Invention [Means for solving the problem]

[0004] According to an embodiment of the present disclosure, there is provided a method for a first device to perform wireless communication, which may include the steps of: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle and the first resource, wherein a cyclic prefix (CP) extension is applied to the first resource, a subcarrier spacing (SCS) associated with the SL transmission is 60 kHz, and a maximum number of symbols used for the CP extension is 2.

[0005] According to one embodiment of the present disclosure, there is provided a first device for wireless communication. For example, the first device may include at least one transceiver; at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions causing the first device to perform operations based on the instructions being executed by the at least one processor. For example, the operations may include: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, wherein a cyclic prefix (CP) extension is applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission is 60 kHz, and the maximum number of symbols used for the CP extension is 2.

[0006] According to an embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal. For example, the apparatus may include at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions causing the first terminal to perform an operation based on the instructions being executed by the at least one processor. For example, the operation may include: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, where a cyclic prefix (CP) extension is applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission is 60 kHz, and the maximum number of symbols used for the CP extension is 2.

[0007] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions, for example, the instructions, when executed, cause a first device to: perform channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and perform a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, where a cyclic prefix (CP) extension is applied to the first resource and based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, a maximum number of symbols used for the CP extension may be 2.

[0008] According to an embodiment of the present disclosure, there is provided a method for a second device to perform wireless communication, for example, the method includes: receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum, the SL transmission being performed on the first resource based on a result of channel sensing for a channel access procedure (CAP) being idle, a cyclic prefix (CP) extension being applied to the first resource, and a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, whereby a maximum number of symbols used for the CP extension may be 2.

[0009] According to an embodiment of the present disclosure, there is provided a second device for wireless communication. For example, the second device may include at least one transceiver; at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform operations. For example, the operations may include: receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum, the SL transmission being performed on the first resource; performing the SL transmission based on a result of channel sensing for a channel access procedure (CAP) being idle; applying a cyclic prefix (CP) extension to the first resource; and based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, the maximum number of symbols used for the CP extension may be 2. [Brief explanation of the drawings]

[0010] [Figure 1] 1 illustrates a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure. [Figure 2] 1 illustrates the electromagnetic spectrum, according to one embodiment of the present disclosure. [Figure 3] 1 illustrates the structure of an NR system according to one embodiment of the present disclosure. [Figure 4] 1 illustrates a radio protocol architecture according to one embodiment of the present disclosure. [Figure 5] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure. [Figure 6] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. [Figure 7] 1 illustrates an example of a BWP according to an embodiment of the present disclosure. [Figure 8]According to one embodiment of the present disclosure, a procedure for a terminal to perform V2X or SL communication depending on a transmission mode is shown. [Figure 9] 1 illustrates three cast types according to one embodiment of the present disclosure. [Figure 10] 1 illustrates an example wireless communication system that supports unlicensed spectrum, according to an example embodiment of the present disclosure. [Figure 11] 1 illustrates a method for occupying resources in an unlicensed spectrum according to one embodiment of the present disclosure. [Figure 12] According to one embodiment of the present disclosure, a case where multiple LBT-SBs are included in the unlicensed band is shown. [Figure 13] 1 illustrates a CAP operation for a base station transmitting a downlink signal over an unlicensed spectrum, according to one embodiment of the present disclosure. [Figure 14] 1 illustrates a Type 1 CAP operation of a terminal for uplink signal transmission, according to one embodiment of the present disclosure. [Figure 15] 1 illustrates how CP extensions are applied, according to one embodiment of the present disclosure. [Figure 16] According to one embodiment of the present disclosure, a maximum value of the CP extension length determined depending on the SCS used for SL transmission is shown. [Figure 17] 1 illustrates a procedure for a first device to perform wireless communication according to one embodiment of the present disclosure. [Figure 18] 10 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a communication system 1 according to one embodiment of the present disclosure. [Figure 20] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 21] 1 illustrates a signal processing circuit for a transmit signal according to one embodiment of the present disclosure. [Figure 22] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 23] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 24] 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] As used herein, "A or B" can mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B or C" can mean "only A," "only B," "only C," or "any combination of A, B, and C."

[0012] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Therefore, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0013] As used herein, "at least one of A and B" can mean "only A," "only B," or "both A and B." Additionally, as used herein, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B."

[0014] Furthermore, in this specification, "at least one of A, B, and C" can mean "only A," "only B," "only C," or "any combination of A, B, and C." Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" can mean "at least one of A, B, and C."

[0015] Furthermore, parentheses used herein may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." Furthermore, "control information" in this specification is not limited to "PDCCH," and "PDCCH" is proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0016] In the following description, "when, if, in case of" may be replaced with "based on."

[0017] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0018] In this specification, a higher layer parameter may be a parameter that is configured for a terminal, configured in advance, or predefined. For example, a base station or a network may transmit the higher layer parameter to the terminal. For example, the higher layer parameter may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0019] The following technologies can be used in various wireless communication systems, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA can be implemented in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless technologies such as global system for mobile communications (GSM), general packet radio service (GPRS), and enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (3rd generation partnership project: registered trademark; the same applies hereinafter) LTE (long term evolution) is part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA), and employs OFDMA in the downlink and SC-FDMA in the uplink.LTE-A (advanced) is an evolution of 3GPP LTE.

[0020] 5G NR is a successor technology to LTE-A and is a new clean-slate mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low-frequency bands below 1 GHz, intermediate-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0021] The goals of the 6G (wireless communication) system include (i) extremely high data speeds per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption for battery-free IoT devices, (vi) ultra-reliable connections, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system is based on four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can satisfy the requirements shown in Table 1 below. In other words, Table 1 is a table showing an example of the requirements for a 6G system.

[0022] [Table 1]

[0023] The 6G system has key elements such as eMBB (Enhanced mobile broadband), URLLC (Ultra-reliable low latency communications), mMTC (massive machine-type communication), AI integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0024] 1 illustrates a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure. The embodiment of FIG. 1 can be combined with various embodiments of the present disclosure.

[0025] 6G systems are expected to have 50 times higher simultaneous wireless communication connectivity than 5G wireless communication systems. URLLC, a key feature of 5G, could become a key technology in 6G communications by providing end-to-end delays of less than 1 ms. 6G systems may have much better volumetric spectral efficiency than the commonly used area spectral efficiency. 6G systems can offer advanced battery technology for extremely long battery life and energy harvesting, eliminating the need for separate charging for mobile devices in 6G systems. The new network characteristics of 6G are as follows:

[0026] - Satellite integrated network: 6G is expected to be integrated with satellites to provide a global mobile network. The integration of terrestrial, satellite and public networks into one wireless communication system is crucial for 6G.

[0027] -Connected intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, evolving wirelessly from "connected things" to "connected intelligence." AI can be applied to each step of the communication process (or each step of signal processing, as described below).

[0028] Seamless integration of wireless information and energy transfer: 6G wireless networks will transmit power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transmission (WIET) can be integrated.

[0029] -Ubiquitous super 3D connectivity: Connecting drones and very low Earth orbit satellite networks to core network functions will create 6G ubiquitous super 3D connectivity.

[0030] Some common requirements for the characteristics of the new 6G network mentioned above are:

[0031] -Small cell networks: The idea of ​​small cell networks was introduced in cellular systems to improve the quality of received signals, resulting in increased throughput, energy efficiency, and spectral efficiency. As a result, small cell networks are an essential feature of 5G and beyond 5G (5G) communication systems. Therefore, 6G communication systems also adopt the features of small cell networks.

[0032] -Ultra-dense heterogeneous network: Ultra-dense heterogeneous networks are likely to become another key feature of 6G communication systems. Multi-layer networks composed of heterogeneous networks will improve overall QoS and reduce costs.

[0033] High-capacity backhaul: The backhaul connection is characterized as a high-capacity backhaul network to support large volumes of traffic. High-speed optical fiber and free-space optical communication (FSO) systems can be a possible solution to the problem.

[0034] - Radar technology integrated with mobile technology: High-precision localization (or location-based services) via communication is one of the functions of 6G wireless communication systems. Therefore, radar systems may be integrated with 6G networks.

[0035] Softwarization and virtualization: Softwarization and virtualization are two key features that underpin the design process for 5GB networks to ensure flexibility, reconfigurability and programmability, and the ability for billions of devices to share a shared physical infrastructure.

[0036] The core implementation technologies of the 6G system are explained below.

[0037] Artificial Intelligence: The most important and newly introduced technology for the 6G system is AI. 4G systems did not involve AI. 5G systems partially or very limitedly support AI. However, 6G systems will fully support AI for automation. Advances in machine learning will create a more intelligent network for real-time communication in 6G. The introduction of AI into communications will simplify and improve real-time data transmission. AI can use numerous analyses to determine how complex target operations are executed. In other words, AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handover, network selection, and resource scheduling can be performed instantly using AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine communications. AI will also enable rapid communication in BCI (Brain-Computer Interface). AI-based communication systems are supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent radios, self-sustaining wireless networks, and machine learning.

[0038] Terahertz Communication: Data transmission rates can be increased by increasing bandwidth. This can be achieved by using sub-THz communication over a wide bandwidth and applying advanced massively multiple input / output (MIMO) technology. Also known as submillimeter radiation, THz waves typically refer to the frequency band between 0.1 THz and 10 THz, with wavelengths ranging from 0.03 mm to 3 mm. The 100 GHz-300 GHz band range (sub-THz band) is considered the primary portion of the THz band for cellular communications. Adding the sub-THz band to the mmWave band will increase 6G cellular communication capacity. Of the defined THz bands, 300 GHz-3 THz is in the far-infrared (IR) frequency band. While the 300 GHz-3 THz band is part of a broadband, it is at the boundary of the broadband and immediately behind the RF band. Therefore, the 300 GHz-3 THz band is similar to RF. Figure 2 illustrates an electromagnetic spectrum according to one embodiment of the present disclosure. The example of Figure 2 can be combined with various embodiments of the present disclosure. Key characteristics of THz communications include (i) a wide usable bandwidth to support very high data rates, and (ii) high path loss at high frequencies (highly directional antennas are essential). The narrow beamwidth produced by highly directional antennas reduces interference. The small wavelength of THz signals allows a greater number of antenna elements to be integrated into devices and base stations operating in this band. This allows for the use of advanced adaptive array techniques that can overcome range limitations.

[0039] -Large-scale MIMO technology

[0040] -Hologram beam forming (HBF)

[0041] -Optical wireless technology

[0042] -Free Space Optical Transmission Backhaul Network (FSO Backhaul Network)

[0043] -Non-Terrestrial Networks (NTN)

[0044] -Quantum Communication

[0045] -Cell-free Communication

[0046] -Integration of Wireless Information and Power Transmission

[0047] -Integration of Wireless Communication and Sensing

[0048] -Integrated Access and Backhaul Network

[0049] -Big data analysis

[0050] -Reconfigurable Intelligent Surface

[0051] -Metaverse

[0052] -Blockchain

[0053] Unmanned Aerial Vehicles (UAVs): UAVs (Unmanned Aerial Vehicles), or drones, have the potential to become a key element in 6G wireless communications. In most cases, high-speed data wireless connections are provided using UAV technology. BS entities are installed on UAVs to provide cellular connectivity. UAVs possess certain features not found in fixed BS infrastructure, such as easy deployment, strong line-of-sight links, and freedom of controlled mobility. During emergency situations such as natural disasters, deploying terrestrial communication infrastructure is economically unfeasible and sometimes unable to provide services in volatile environments. UAVs can easily handle such situations. UAVs have the potential to become a new paradigm in the field of wireless communications. This technology facilitates the three fundamental requirements of wireless networks: eMBB, URLLC, and mMTC. UAVs can also support various purposes such as improved network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, and accident monitoring. Therefore, UAV technology is recognized as one of the most important technologies for 6G communications.

[0054] -Autonomous Driving (Self-driving): Perfect autonomous driving requires vehicle-to-vehicle communication to notify each other of dangerous situations, or vehicle-to-vehicle communication with infrastructure such as parking lots and traffic lights to confirm information such as parking location and traffic light change times. V2X (Vehicle-to-Everything), a key element in building autonomous driving infrastructure, is a technology that allows vehicles to communicate and share information with various elements on the road for autonomous driving, including wireless communication between vehicles (V2V, Vehicle-to-Vehicle) and between vehicles and infrastructure (V2I, Vehicle-to-Infrastructure). High-speed transmission and low-latency technology are essential to maximize autonomous driving performance and ensure high safety. Furthermore, autonomous driving will go beyond simply providing warnings and guidance messages to drivers and actively intervene in vehicle operation, directly controlling the vehicle in dangerous situations. This will require a huge amount of information to be transmitted and received, and 6G is expected to maximize autonomous driving with faster transmission speeds and lower latency than 5G.

[0055] For clarity of explanation, the description focuses on 5G NR, but the technical idea according to an embodiment of the present disclosure is not limited thereto, and various embodiments of the present disclosure may also be applied to 6G communication systems.

[0056] 3 illustrates an NR system architecture according to one embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure.

[0057] Referring to FIG. 3, a Next Generation Radio Access Network (NG-RAN) may include a base station 20 that provides user plane and control plane protocol termination for a terminal 10. For example, the base station 20 may include a next generation NodeB (gNB) and / or an evolved NodeB (eNB). For example, the terminal 10 may be fixed or mobile, and may be referred to as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, or other terms. For example, a base station is a fixed station that communicates with the terminal 10, and may be referred to as a base transceiver system (BTS), an access point, or other terms.

[0058] The embodiment of Figure 3 illustrates a case where only gNBs are included. Base stations 20 may be connected to each other via an Xn interface. Base stations 20 may be connected to a 5G Core Network (5GC) via an NG interface. More specifically, base stations 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface and to a user plane function (UPF) 30 via an NG-U interface.

[0059] The radio interface protocol layers between a terminal and a network can be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based on the bottom three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. Among these, the physical layer, which belongs to Layer 1, provides an information transfer service using a physical channel, and the Radio Resource Control (RRC) layer, which is located in Layer 3, controls radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0060] Figure 4 illustrates a radio protocol architecture according to one embodiment of the present disclosure. The embodiment of Figure 4 can be combined with various embodiments of the present disclosure. Specifically, Figure 4(a) illustrates a user plane radio protocol stack for Uu communications, and Figure 4(b) illustrates a control plane radio protocol stack for Uu communications. Figure 4(c) illustrates a user plane radio protocol stack for SL communications, and Figure 4(d) illustrates a control plane radio protocol stack for SL communications.

[0061] Referring to Figure 4, the physical layer provides information transfer services to higher layers using physical channels. The physical layer is connected to the higher layer, the Medium Access Control (MAC) layer, via transport channels. Data moves between the MAC layer and the physical layer via the transport channels. Transport channels are classified according to how and what characteristics data is transmitted over the radio interface.

[0062] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which can be modulated using Orthogonal Frequency Division Multiplexing (OFDM) and utilizes time and frequency as radio resources.

[0063] The MAC layer provides services to the higher-level radio link control (RLC) layer via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transfer services on the logical channels.

[0064] The RLC layer performs concatenation, segmentation, and reassembly of RLC Service Data Units (SDUs). To guarantee various Quality of Service (QoS) requirements for Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0065] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between the terminal and the network.

[0066] The functions of the PDCP layer in the user plane include user data transmission, header compression, and ciphering, and the functions of the PDCP layer in the control plane include control plane data transmission and encryption / integrity protection.

[0067] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between QoS flows and data radio bearers, QoS flow identifier (ID) marking in downlink and uplink packets, etc.

[0068] RB configuration refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service and setting their specific parameters and operation methods. RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). SRB is used as a path to transmit RRC messages in the control plane, and DRB is used as a path to transmit user data in the user plane.

[0069] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal is in an RRC_CONNECTED state; otherwise, it is in an RRC_IDLE state. In the case of NR, an RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state maintains a connection with the core network and can release the connection with the base station.

[0070] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Downlink Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of a downlink multicast or broadcast service can be transmitted via the Downlink SCH or via a separate Multicast Channel (MCH). Meanwhile, uplink transport channels for transmitting data from a terminal to a network include a Random Access Channel (RACH) for transmitting initial control messages and an Uplink Shared Channel (SCH) for transmitting user traffic and control messages.

[0071] Above the transport channels, logical channels that are mapped to the transport channels include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0072] 5 illustrates a radio frame structure for NR according to one embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0073] Referring to Figure 5, in NR, radio frames can be used for uplink and downlink transmission. A radio frame has a length of 10 ms and can be defined as two 5 ms half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots in a subframe can be determined by the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP).

[0074] When a normal CP is used, each slot can contain 14 symbols. When an extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols) or Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0075] Table 2 below shows the number of symbols per slot (N) depending on the SCS setting (u) when a normal CP or an extended CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0076] [Table 2]

[0077] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, thereby allowing the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols to be set to be different between the merged cells.

[0078] In NR, multiple numerologies or SCSs can be supported to support various 5G services. For example, if the SCS is 15 kHz, wide areas in traditional cellular bands can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban areas, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0079] The NR frequency band can be defined as two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed. For example, the two types of frequency ranges are shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range" and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0080] [Table 3]

[0081] As mentioned above, the numerical values ​​of the frequency range of the NR system may be changed. For example, FR1 may include the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include unlicensed bands. Unlicensed bands may be used for various purposes, such as communications for vehicles (e.g., autonomous driving).

[0082] [Table 4]

[0083] 6 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure.

[0084] 6, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot may include 14 symbols, and in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot may include 7 symbols, and in the case of an extended CP, one slot may include 6 symbols.

[0085] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined as multiple (P)RBs (Physical Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed via activated BWPs. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0086] Below, we will explain about BWP (Bandwidth Part) and carrier.

[0087] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. PRBs can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0088] For example, the BWP may be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor downlink radio link quality in DL BWPs other than the active DL BWP on the primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE may not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside the active UL BWP. For example, in the downlink, the initial BWP is given as a contiguous RB set for the remaining minimum system information (RMSI) control resource set (CORESET) (set by the physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for the random access procedure. For example, the default BWP is configured by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. To save energy, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0089] Meanwhile, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive an SL channel or an SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a terminal can receive a configuration for the SL BWP from a base station / network. For example, a terminal can receive a configuration for the Uu BWP from a base station / network. An SL BWP can be configured (pre-configured) for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For a terminal in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0090] 7 illustrates an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 7, it is assumed that there are three BWPs.

[0091] Referring to Figure 7, CRBs (common resource blocks) are carrier resource blocks numbered from one end of a carrier band to the other end, and PRBs are resource blocks numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0092] BWP is point A, offset from point A (N start BWP ) and bandwidth (N size BWP) For example, point A is the external reference point of the PRB of the carrier to which subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on the carrier) is aligned. For example, the offset is the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0093] Below, we will explain V2X or SL communication.

[0094] The Sidelink Synchronization Signal (SLSS) is a SL-specific sequence and may include a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The PSSS may be referred to as a Sidelink Primary Synchronization Signal (S-PSS), and the SSSS may be referred to as a Sidelink Secondary Synchronization Signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 Gold sequences may be used for the S-SSS. For example, a terminal may perform initial signal detection and acquire synchronization using the S-PSS. For example, a terminal may acquire detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0095] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal must know first before transmitting or receiving an SL signal. For example, the basic information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool-related information, type of application related to SLSS, subframe offset, broadcast information, etc. For example, for evaluating PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits, including a 24-bit CRC (Cyclic Redundancy Check).

[0096] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an S-SS (Synchronization Signal) / PSBCH block, hereinafter referred to as an S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured S-BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. The frequency location of the S-SSB can be (pre-) configured. Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0097] 8 illustrates a procedure in which a terminal performs V2X or SL communication according to a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 can be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for convenience of description, in LTE, the transmission mode may be referred to as an LTE transmission mode, and in NR, the transmission mode may be referred to as an NR resource allocation mode.

[0098] For example, (a) of Figure 8 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) of Figure 8 illustrates terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to general SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0099] For example, (b) of FIG. 8 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 8 illustrates terminal operation associated with NR resource allocation mode 2.

[0100] 8(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station may schedule SL resources to be used by a terminal for SL transmission. For example, in step S800, the base station may transmit information related to SL resources and / or information related to UL resources to a first terminal. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0101] For example, the first terminal may receive information related to dynamic grant (DG) resources and / or information related to configured grant (CG) resources from the base station. For example, the CG resources may include CG type 1 resources or CG type 2 resources. In this specification, the DG resources may be resources configured / assigned to the first terminal by the base station via downlink control information (DCI). In this specification, the CG resources may be (periodic) resources configured / assigned to the first terminal by the base station via DCI and / or an RRC message. For example, in the case of CG type 1 resources, the base station may send an RRC message including information related to the CG resources to the first terminal. For example, in the case of CG type 2 resources, the base station may send an RRC message including information related to the CG resources to the first terminal, and the base station may send a DCI related to the activation or release of the CG resources to the first terminal.

[0102] In step S810, the first terminal may transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to a second terminal based on the resource scheduling. In step S820, the first terminal may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) associated with the PSCCH to a second terminal. In step S830, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from a second terminal. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second terminal via the PSFCH. In step S840, the first terminal may transmit / report HARQ feedback information to a base station via a PUCCH or a PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on the HARQ feedback information received from the second terminal. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on a preset rule. For example, the DCI may be DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0103] Referring to (b) of FIG. 8, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine SL transmission resources within SL resources configured by the base station / network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources may be a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can self-select resources within a configured resource pool to perform SL communication. For example, the terminal can perform sensing and resource (re)selection procedures and self-select resources within a selection window. For example, the sensing can be performed in units of subchannels. For example, in step S810, the first terminal that self-selected resources within the resource pool may use the resources to transmit PSCCH (e.g., SCI (Sidelink Control Information) or 1 st In step S820, the first terminal transmits a PSSCH (e.g., a 2-stage SCI) associated with the PSCCH to the second terminal. nd In step S830, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0104] Referring to (a) or (b) of FIG. 8, for example, the first terminal can transmit an SCI to the second terminal on the PSCCH. Alternatively, for example, the first terminal can transmit two consecutive SCIs (e.g., 2-stage SCIs) to the second terminal on the PSCCH and / or PSSCH. In this case, the second terminal can decode the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the first terminal. In this specification, the SCI transmitted on the PSCCH is referred to as a 1 st SCI, 1st SCI, 1 st -stage SCI or 1 st The SCI transmitted on the PSSCH can be referred to as a 2-stage SCI format. nd SCI, 2nd SCI, 2nd -stage SCI or 2 nd -stage SCI format. For example, st -stage SCI formats can include SCI format 1-A, 2 nd -stage SCI formats may include SCI format 2-A and / or SCI format 2-B.

[0105] An example of SCI format 1-A will be described below.

[0106] SCI format 1-A is used for scheduling of the PSSCH and the 2nd-stage SCI on the PSSCH.

[0107] The following information is transmitted using SCI Format 1-A.

[0108] - Priority - 3 bits

[0109] - Frequency resource allocation - When the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, the ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3, then ceilinglog2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0110] - Time resource allocation - 5 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 2; otherwise, 9 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3

[0111] -Resource reservation period-ceiling(log2N rsv_period ) bits, where N rsv_period is the number of entries in the upper layer parameter sl-ResourceReservePeriodList if the upper layer parameter sl-MultiReserveResource is set; otherwise, a 0 bit

[0112] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0113] - 2nd-stage SCI format - 2 bits as defined in Table 5

[0114] - Better_Offsets Indicator - 2 bits as provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0115] Number of DMRS ports - 1 bit as defined in Table 6

[0116] -Modulation and coding method - 5 bits

[0117] - Additional MCS table indicator - 1 bit if one MCS table is set by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the higher layer parameter sl-Additional-MCS-Table; 0 bit otherwise

[0118] PSFCH overhead indicator - 1 bit if the upper layer parameter sl-PSFCH-Period=2 or 4; otherwise 0 bit

[0119] Reserved Bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to 0.

[0120] [Table 5]

[0121] [Table 6]

[0122] An example of SCI format 2-A will be described below.

[0123] In HARQ operation, if the HARQ-ACK information includes an ACK or a NACK, or if the HARQ-ACK information includes only a NACK, or if there is no feedback of the HARQ-ACK information, SCI format 2-A is used to decode the PSSCH.

[0124] The following information is transmitted via SCI Format 2-A.

[0125] - HARQ process number - 4 bits

[0126] -New Data Indicator - 1 bit

[0127] -redundancy version - 2 bits

[0128] - Source ID - 8 bits

[0129] -Destination ID - 16 bits

[0130] HARQ feedback activation / deactivation indicator - 1 bit

[0131] Cast Type Indicator - 2 bits as defined in Table 7

[0132] - CSI Request - 1 bit

[0133] [Table 7]

[0134] An example of SCI format 2-B will be described below.

[0135] SCI format 2-B is used for decoding the PSSCH and is used with HARQ operation when the HARQ-ACK information includes only NACK or there is no feedback of HARQ-ACK information.

[0136] The following information is transmitted via SCI Format 2-B.

[0137] - HARQ process number - 4 bits

[0138] -New Data Indicator - 1 bit

[0139] -redundancy version - 2 bits

[0140] - Source ID - 8 bits

[0141] -Destination ID - 16 bits

[0142] HARQ feedback activation / deactivation indicator - 1 bit

[0143] - Zone ID - 12 bits

[0144] - Range requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0145] 8(a) or 8(b), in step S830, the first terminal may receive a PSFCH. For example, the first terminal and the second terminal may determine a PSFCH resource, and the second terminal may use the PSFCH resource to transmit HARQ feedback to the first terminal.

[0146] Referring to (a) of FIG. 8, in step S840, the first terminal can transmit SL HARQ feedback to the base station via the PUCCH and / or PUSCH.

[0147] Figure 9 shows three cast types according to one embodiment of the present disclosure. The embodiment of Figure 9 can be combined with various embodiments of the present disclosure.

[0148] Specifically, (a) of FIG. 9 shows broadcast type SL communication, (b) of FIG. 9 shows unicast type SL communication, and (c) of FIG. 9 shows groupcast type SL communication. In the case of unicast type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0149] On the other hand, the conventional NR-U (unlicensed spectrum) supports communication between terminals and base stations in unlicensed spectrum, and Rel-18 is scheduled to support a mechanism that can support communication between sidelink terminals in unlicensed spectrum.

[0150] In this disclosure, a channel can refer to a frequency axis resource set for performing Listen-Before-Talk (LBT). In NR-U, a channel refers to a 20 MHz LBT bandwidth and has the same meaning as an RB set. For example, an RB set is defined in Section 7 of 3GPP TS38.214V17.0.0.

[0151] In this disclosure, CO (channel occupancy) refers to the time / frequency axis resources acquired by a base station or a terminal after successful LBT.

[0152] In this disclosure, COT (channel occupancy time) refers to the time axis resource acquired by a base station or a terminal after successful LBT. It is shared between the base station (or terminal) that acquired CO and the terminal (or base station), which can be called COT sharing. Depending on the initiating device, this can be called gNB-initiated COT or UE-initiated COT.

[0153] A wireless communication system that supports unlicensed bands (shared spectrum) will be described below.

[0154] 10 illustrates an example of a wireless communication system supporting unlicensed spectrum according to an embodiment of the present disclosure. For example, the example of FIG. 10 may include an NR-U (unlicensed spectrum) wireless communication system. The example of FIG. 10 may be combined with various examples of the present disclosure.

[0155] In the following description, a cell operating in a licensed band (hereinafter, L-band) may be defined as an LCell, and a carrier of an LCell may be defined as a (DL / UL / SL)LCC. Also, a cell operating in an unlicensed band (hereinafter, U-band) may be defined as a UCell, and a carrier of a UCell may be defined as a (DL / UL / SL)UCC. A cell's carrier / carrier-frequency refers to the operating frequency (e.g., center frequency) of the cell. A cell / carrier (e.g., CC) is commonly referred to as a cell.

[0156] As shown in (a) of Figure 10, when a terminal and a base station transmit and receive signals via carrier-coupled LCC and UCC, the LCC is set as a PCC (Primary CC) and the UCC is set as an SCC (Secondary CC). As shown in (b) of Figure 10, the terminal and the base station can transmit and receive signals via one UCC or multiple carrier-coupled UCCs. That is, the terminal and the base station can transmit and receive signals via only UCC(s) without an LCC. For standalone operation, PRACH, PUCCH, PUSCH, SRS transmission, etc. are supported in the UCell.

[0157] In the embodiment of Figure 10, the base station can be replaced by a terminal, in which case, for example, PSCCH, PSSCH, PSFCH, S-SSB transmission, etc. are supported in the UCell.

[0158] Unless otherwise specified, the following definitions apply to terms used in this specification. For example, in this disclosure, unlicensed spectrum and shared spectrum can be interchangeable / substituted. For example, in this disclosure, channel sensing (on a shared spectrum) refers to channel sensing for CAP (channel access procedure).

[0159] Channel: Consists of consecutive RBs in which a channel access procedure is performed in a shared spectrum, and can also be called a carrier or a part of a carrier.

[0160] -Channel access procedure (CAP): This refers to a procedure for evaluating channel availability based on sensing to determine whether other communication nodes can use the channel before transmitting a signal. The basic unit for sensing is T sl The sensing slot has a duration of 9 us. The base station or the terminal senses the channel during the sensing slot, and the power detected for at least 4 us within the sensing slot is equal to or exceeds the energy detection threshold X Thresh If it is smaller, the sensing slot period T sl is considered to be inactive. Otherwise, the sensing slot period T sl = 9us is considered a busy state. CAP can be called LBT (Listen-Before-Talk). For example, CAP (channel access procedure) can include LBT, and for CAP, channel sensing is performed to monitor the power of the channel during a specific time interval (channel sensing interval).

[0161] Channel occupancy: refers to the corresponding transmission(s) on the channel(s) by the base station / terminal after performing the channel access procedure.

[0162] Channel occupancy time (COT): After a base station / terminal performs a channel access procedure, this refers to the total time that the base station / terminal and any base station / terminal(s) sharing the channel occupancy can transmit on the channel. When determining COT, if the transmission gap is 25us or less, the gap period is also counted in COT. COT can be shared for transmission between the base station and corresponding terminal(s).

[0163] DL transmission burst: Defined as a set of transmissions from a base station with no gaps exceeding 16 us. Transmissions from a base station separated by gaps exceeding 16 us are considered separate DL transmission bursts. The base station can perform transmissions after the gaps without sensing channel availability within the DL transmission burst.

[0164] UL or SL transmission burst: Defined as a set of transmissions from a terminal without a gap exceeding 16 us. Transmissions from a terminal separated by a gap exceeding 16 us are considered separate UL or SL transmission bursts. The terminal can perform transmission after the gap without sensing channel availability within the UL or SL transmission burst.

[0165] Discovery burst: refers to a DL transmission burst containing a set of signal(s) and / or channel(s) bounded within a (time) window and associated duty cycle. In an LTE-based system, a discovery burst includes PSS, SSS, and CRS (cell-specific RS) as transmission(s) initiated by the base station, and may further include non-zero power CSI-RS. In an NR-based system, a discovery burst includes at least SS / PBCH blocks as transmission(s) initiated by the base station, and may further include a CORESET for a PDCCH scheduling a PDSCH with SIB1, a PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0166] 11 illustrates a method for occupying resources in an unlicensed spectrum according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0167] Referring to FIG. 11, a communication node (e.g., a base station, a terminal) in an unlicensed band needs to determine whether other communication nodes can use the channel before transmitting a signal. To this end, the communication node in the unlicensed band can perform a channel access procedure (CAP) to connect to a channel on which transmissions are to be performed. The channel access procedure is performed based on sensing. For example, a communication node can first perform carrier sensing (CS) before transmitting a signal to check whether other communication nodes are transmitting signals. A case where it is determined that other communication nodes are not transmitting signals is defined as a clear channel assessment (CCA) check. A CCA threshold (e.g., X) that is previously defined or set by an upper layer (e.g., RRC) is used to determine whether other communication nodes are transmitting signals. Thresh ), if a communication node detects energy higher than the CCA threshold in the channel, the communication node can determine the channel state as busy, otherwise determine the channel state as idle. If the channel state is determined to be idle, the communication node can start signal transmission in the unlicensed band. CAP can be substituted for LBT. For example, CAP (channel access procedure) can include LBT, and for CAP, channel sensing is performed to monitor the power of the channel during a specific time period (channel sensing period).

[0168] Table 8 illustrates the channel access procedures (CAP) supported in NR-U.

[0169] [Table 8]

[0170] Referring to Table 8, LBT types or CAPs for DL / UL / SL transmission are defined. However, Table 8 is merely an example, and new types or CAPs are defined in a similar manner. For example, Type 1 (also referred to as Cat-4 LBT) may be a random back-off based channel access procedure. For example, in the case of Cat-4, the contention window may change. For example, Type 2 can be performed in case of COT sharing within COT acquired by a base station or terminal.

[0171] The LBT-SB (Subband) (or RB set) will be described below.

[0172] In a wireless communication system supporting unlicensed bands, a cell (or carrier (e.g., CC)) or BWP configured in a terminal is configured with a wideband having a larger BW (Band Width) than that of existing LTE. However, the BW required for CCA based on independent LBT operation is limited due to regulations, etc. If a sub-band (SB) on which an individual LBT is performed is defined as an LBT-SB, multiple LBT-SBs are included in one wideband cell / BWP. The RB set constituting the LBT-SB is configured via higher layer (e.g., RRC) signaling. Therefore, one cell / BWP includes one or more LBT-SBs based on (i) the BW of the cell / BWP and (ii) RB set allocation information.

[0173] 12 illustrates a case where multiple LBT-SBs are included in an unlicensed band according to one embodiment of the present disclosure. The example of FIG. 12 can be combined with various other examples of the present disclosure.

[0174] Referring to FIG. 12, the BWP of a cell (or carrier) includes multiple LBT-SBs. The LBT-SB has, for example, a 20 MHz bandwidth. The LBT-SB is composed of multiple consecutive (P)RBs in the frequency domain and can be called a (P)RB set. Although not shown, guard bands (GBs) are included between the LBT-SBs. Therefore, the BWP is composed of the following format: {LBT-SB#0(RBset#0)+GB#0+LBT-SB#1(RBset#1+GB#1)+...+LBT-SB#(K-1)(RBset(#K-1))}. For convenience, the LBT-SB / RB index is set / defined to start from a lower frequency band and increase as it moves to a higher frequency band.

[0175] CAPC (Channel Access Priority Class) will be explained below.

[0176] The CAPC of the MAC CE and radio bearer is fixed or configurable to operate in FR1:

[0177] - Padding BSR (Buffer Status Report) and recommended bit rate are fixed as the lowest priority for MAC CE;

[0178] -Fixed as the highest priority for SRB0, SRB1, SRB3 and other MAC CEs;

[0179] Configured by the base station for SRB2 and DRB.

[0180] When selecting a CAPC for a DRB, the base station considers the 5QI of all QoS flows multiplexed into that DRB and considers fairness between other traffic types and transmissions. Table 9 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC to use for a given QoS flow. For standardized 5QI, the CAPC is defined as shown in the table below, and for non-standardized 5QI, the CAPC that best matches the QoS characteristics should be used.

[0181] [Table 9]

[0182] A method for transmitting a downlink signal via an unlicensed band will be described below. For example, the method for transmitting a downlink signal via an unlicensed band can be applied to a method for transmitting a sidelink signal via an unlicensed band.

[0183] A base station may perform one of the following channel access procedures (CAP) for downlink signal transmission in the unlicensed spectrum:

[0184] (1) Type 1 Downlink (DL) CAP Method

[0185] In Type 1 DL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is random. Type 1 DL CAP can be applied to the following transmissions:

[0186] - a base station initiated transmission(s) including (i) a unicast PDSCH with user plane data, or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0187] - Base station initiated transmission(s) having (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0188] 13 illustrates a CAP operation for a base station transmitting a downlink signal over an unlicensed spectrum, according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0189] Referring to FIG. 13, the base station first sets a defer duration T d The channel is sensed to be idle during the sensing slot period, and if the counter N then becomes 0, transmission can be performed (S134). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the following procedure:

[0190] Step 1) (S120) N=N init where N init is 0 to CW p is a random value evenly distributed between . Then go to step 4.

[0191] Step 2) (S140) If N>0 and the base station chooses to decrement the counter, set N=N-1.

[0192] Step 3) (S150) Sense the channel during the additional sensing slot period. If the additional sensing slot period is a pause (Y), proceed to step 4. If not (N), proceed to step 5.

[0193] Step 4) (S130) If N=0 (Y), then end the CAP procedure (S132). Otherwise (N), go to step 2.

[0194] Step 5) (S160) Additional delay period T dIf a busy sensing slot is detected within the additional delay period T d The channel is sensed until all sensing slots in are detected as idle.

[0195] Step 6) (S170) Additional delay period T d If the channel is sensed as idle during all sensing slot periods (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0196] Table 10 shows the m applied to CAP by channel connection priority class. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are shown to vary.

[0197] [Table 10]

[0198] Refer to Table 10, which defines the CWS (contention window size) and maximum COT value for each CAPC. For example, T d =T f +m p *T sl It could be.

[0199] Delay period T d is interval T f (16us)+m p T consecutive sensing slot intervals sl (9us) in that order. T f is the sensing slot period T at the start of the 16us period. sl Includes:

[0200] CW min、p <=CW p <=CW max、pCW p is CW p =CW min、p and is updated before step 1 (CW size update) based on HARQ-ACK feedback (e.g., ACK or NACK ratio) for the previous DL burst (e.g., PDSCH). p is determined based on the HARQ-ACK feedback for the previous DL burst. min、p It can be initialized to , increased to the next highest allowed value, or the existing value can be kept as is.

[0201] (2) Type 2 Downlink (DL) CAP Method

[0202] In Type 2 DL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is deterministic. Type 2 DL CAP is divided into Type 2A / 2B / 2C DL CAP.

[0203] Type 2A DL CAP is applicable to the following transmissions: In Type 2A DL CAP, the base station transmits the data for at least the sensing period T short_dl A transmission can be sent immediately after the channel is sensed as idle for T = 25us. short_dl is interval T f (=16us) and one sensing slot section immediately following it. f includes a sensing slot at the beginning of the interval.

[0204] - a base station initiated transmission(s) having (i) only a discovery burst, or (ii) a discovery burst multiplexed with non-unicast information, or

[0205] - Transmission by a base station after a 25us gap from a transmission by a terminal within a shared channel occupancy.

[0206] Type 2B DL ​​CAP is applicable to transmission(s) performed by the base station after a 16 us gap from transmission(s) by the terminal during the shared channel occupancy time. In Type 2B DL ​​CAP, the base station f A transmission can be sent immediately after the channel is sensed as idle for T = 16us. f The Type 2C DL CAP includes a sensing slot within the last 9 us of the interval. Type 2C DL CAP is applicable to transmission(s) performed by the base station after a maximum 16 us gap from the transmission(s) by the terminal within the shared channel occupancy time. In Type 2C DL CAP, the base station does not sense the channel before performing a transmission.

[0207] In the following, a method for transmitting an uplink signal via an unlicensed band will be described, which can be applied to a method for transmitting a sidelink signal via an unlicensed band.

[0208] A terminal performs Type 1 or Type 2 CAP for uplink signal transmission in an unlicensed band. Typically, a terminal can perform a CAP (e.g., Type 1 or Type 2) set by a base station for uplink signal transmission. For example, an UL grant (e.g., DCI format 0_0, 0_1) for scheduling PUSCH transmission includes CAP type indication information for the terminal.

[0209] (1) Type 1 Uplink (UL) CAP Method

[0210] In Type 1 UL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is random. Type 1 UL CAP can be applied to the next transmission.

[0211] -Scheduled and / or configured PUSCH / SRS transmission(s) from the base station

[0212] - PUCCH transmission(s) scheduled and / or configured from the base station

[0213] -RAP (Random Access Procedure) related transmissions

[0214] 14 illustrates a Type 1 CAP operation of a terminal for uplink signal transmission according to one embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0215] Referring to FIG. 14, the terminal first receives a delay period T d The channel is sensed to be idle during the sensing slot period, and if the counter N then becomes 0, transmission can be performed (S234). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the following procedure:

[0216] Step 1) (S220) N=N init where N init is 0 to CW p is a random value evenly distributed between . Then go to step 4.

[0217] Step 2) (S240) If N>0 and the terminal selects to decrement the counter, set N=N-1.

[0218] Step 3) (S250) Sense the channel during the additional sensing slot period. If the additional sensing slot period is a pause (Y), proceed to step 4. If not (N), proceed to step 5.

[0219] Step 4) (S230) If N=0 (Y), end the CAP procedure (S232). Otherwise (N), go to step 2.

[0220] Step 5) (S260) Additional delay period T d If a busy sensing slot is detected within the additional delay period T d Senses the channel until all sensing slots in are detected as idle.

[0221] Step 6) (S270) Additional delay period T d If the channel is sensed to be idle during all sensing slot periods (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0222] Table 11 shows the m applied to CAP by channel connection priority class. p , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes vary.

[0223] [Table 11]

[0224] Refer to Table 11, which defines the CWS (contention window size) and maximum COT value for each CAPC. For example, T d =T f +m p *T sl It could be.

[0225] Delay period T d is interval T f (16us)+m p T consecutive sensing slot intervals sl (9us) in that order. T f is the sensing slot period T at the start of the 16us period. sl Includes:

[0226] CW min、p <=CW p<=CW max、p CW p is CW p =CW min、p and is updated before step 1 (CW size update) based on explicit / implicit acknowledgement to previous UL bursts (e.g., PUSCH). p CW based on explicit / implicit acknowledgement of previous UL bursts. min、p It can be initialized to , increased to the next highest allowed value, or the existing value can be kept as is.

[0227] (2) Type 2 Uplink (UL) CAP Method

[0228] In Type 2 UL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is deterministic. Type 2 UL CAP is classified into Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the UE must sense the time interval T short_dl A transmission can be sent immediately after the channel is sensed as idle for T = 25us. short_dl is interval T f (=16us) and one sensing slot section immediately following it. f The sensing slot is included at the beginning of the period. In Type 2B UL CAP, the terminal starts the sensing period T f A transmission can be sent immediately after the channel is sensed as idle for 16us. In Type 2B UL CAP, T f includes a sensing slot within the last 9 us of the interval. In Type 2C UL CAP, the terminal does not sense the channel before transmitting.

[0229] For example, according to Type 1 LBT-based NR-U operation, a terminal with uplink data to transmit can select a CACP that is mapped to the 5QI of the data, and the terminal can set the parameters of the CACP (e.g., minimum contention window size, maximum contention window size, m p For example, the UE can select a random value between the minimum CW and the maximum CW mapped to CAPC and then select a back-off counter (BC). In this case, for example, BC can be a positive integer less than or equal to the random value. A UE that senses a channel decreases BC by 1 if the channel is idle. When BC becomes zero and the UE enters T d (T d =T f +m p *T sl If a terminal detects that the channel is idle for a period of time, it can occupy the channel and attempt to transmit data. For example, if a terminal detects that the channel is idle for a period of time, it can occupy the channel and attempt to transmit data. sl (=9 usec) is a basic sensing unit or sensing slot, and includes a measurement duration of at least 4 usec. For example, T f (=16usec) 9usec in front is T sl It consists of:

[0230] For example, according to Type 2 LBT-based NR-U operation, a terminal can perform Type 2 LBT (e.g., Type 2A LBT, Type 2B LBT, Type 2C LBT) within the COT to perform data transmission.

[0231] For example, Type 2A (also called Cat-2 LBT (oneshot LBT) or one-shot LBT) can be a 25-usec one-shot LBT. In this case, transmission can begin immediately after idle sensing for at least a 27-usec gap. Type 2A is used to initiate SSB and non-unicast DL information transmission. That is, the terminal can sense the channel for 25 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0232] For example, Type 2B can be a 16-usec one-shot LBT. In this case, transmission can start immediately after idle sensing for a 16-usec gap. That is, the terminal can sense the channel for 16 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0233] For example, in the case of Type 2C (also called Cat-1 LBT or No LBT), LTB may not be performed. In this case, transmission may start immediately after a gap of up to 16 usec without sensing the channel before the transmission. The duration of the transmission may be up to 584 usec. The terminal may attempt transmission after 16 usec without sensing, and the terminal may perform transmission for up to 584 usec.

[0234] In a sidelink unlicensed band, a terminal can perform a channel access operation based on Listen Before Talk (LBT). Before connecting to a channel in an unlicensed band, the terminal needs to check whether the access channel is idle (e.g., a state in which the terminal does not occupy the channel, a state in which the terminal is connected to the channel and can transmit data) or busy (e.g., a state in which the channel is occupied and a data transmission / reception operation is performed on the channel, a terminal attempting to access the channel cannot transmit data when the channel is busy). That is, the operation in which the terminal checks whether the channel is idle or busy can be called Clear Channel Assessment (CCA), and the terminal can check whether the channel is idle or busy during the CCA duration.

[0235] On the other hand, in the next-generation system, a terminal can perform SL transmission and / or reception operations in an unlicensed band. Meanwhile, operation in an unlicensed band is preceded by a channel sensing operation (e.g., energy detection / measurement) for a channel to be used before the terminal performs transmission according to band-specific regulations or requirements. The terminal can perform transmission to the unlicensed band only if the channel or RB set to be used is determined to be idle (e.g., if the measured energy is equal to or less than a specific threshold) based on the result of the channel sensing. On the other hand, if the channel or RB set to be used is determined to be busy (e.g., if the measured energy is equal to or greater than a specific threshold) based on the result of the channel sensing, the terminal can cancel all or part of the transmission to the unlicensed band.

[0236] On the other hand, when operating in an unlicensed band, after a terminal transmits for a specific time period, the channel sensing operation is omitted or simplified (the channel sensing period is made relatively small) within a certain period of time, while after a certain period of time has passed after transmission, a general channel sensing operation is performed to determine whether or not transmission is possible.

[0237] On the other hand, in transmission in unlicensed bands, depending on regulations or requirements, the time duration and / or frequency occupation area size and / or power spectral density (PSD) of the signal / channel transmitted by the terminal may be above a certain level.

[0238] On the other hand, in the unlicensed band, in order to simplify channel sensing, the content that a channel secured through initial general channel sensing is occupied for a certain period of time may be notified through COT (channel occupancy time) interval information, and the maximum length of the COT interval is set differently depending on the priority of the service or data packet or the channel access priority class (CAPC, channel access priority class).

[0239] On the other hand, the base station can share the COT interval it has secured through channel sensing in the form of DCI transmission, and the terminal can perform a specific (instructed) channel sensing type and / or CP extension within the COT interval according to the DCI information received from the base station. On the other hand, the terminal can again share the COT interval it has secured through channel sensing with the base station that is the receiver of the terminal's UL transmission, and related information is provided via UL via CG-UCI. In this situation, the base station can perform simplified channel sensing within the COT interval shared from the terminal.

[0240] On the other hand, in the case of SL communication, there are situations such as Mode 1 RA operation where the terminal is instructed by the base station via DCI or RRC signaling which resources to use for SL transmission, and there are also operations such as Mode 2 RA operation where SL transmission and reception are performed via terminal-to-terminal sensing operation without the help of the base station.

[0241] On the other hand, in the case of channel access type 1, which can be used regardless of the COT (channel occupancy time) setting, the procedures shown in Tables 12 and 13 are performed for DL ​​transmission, and the procedures shown in Tables 14 and 15 are performed for UL transmission.

[0242] In the present disclosure, channel access can alternate / replace with channel sensing.

[0243] [Table 12]

[0244] [Table 13]

[0245] [Table 14]

[0246] [Table 15]

[0247] Meanwhile, simplified channel access type 2 within COT (channel occupancy time) was used before transmission, and the procedure shown in Table 16 was performed in the case of DL transmission, and the procedure shown in Table 17 was performed in the case of UL transmission.

[0248] [Table 16]

[0249] [Table 17]

[0250] According to an embodiment of the present disclosure, type 2 ASL channel access is a method similar to type 2 ADL and / or UL channel access, where a sensing period of T_short_sl=25 us and a T_f=16 us period directly connected to the sensing period are configured with one sensing slot, and T_f may include the sensing slot at its beginning. Basic idle determination also uses a DL or UL method.

[0251] According to one embodiment of the present disclosure, Type 2 BSL channel access can be a method similar to Type 2 BDL and / or UL channel access, with a sensing period of T_f=16 us, where T_f includes a sensing slot in the last 9 us period. Basic idle determination can also be performed using the DL or UL method.

[0252] According to one embodiment of the present disclosure, Type 2 CSL channel access may be performed without channel sensing, as in Type 2 CDL and / or UL channel access, and instead, the time duration of SL transmission may be up to 584 us.

[0253] According to one embodiment of the present disclosure, Type 1 SL channel access is a method similar to Type 1 DL and / or UL channel access, in which: i) an integer value N is randomly derived based on the size of a contention window corresponding to a priority class; ii) if the channel sensing result for a defer duration of size T_d corresponding to the priority class is idle, the counter value is decremented to N-1 in units of T_sl if the result is idle; and iii) if the counter value is 0, the terminal can occupy the RB set or channel that is the target of channel sensing.

[0254] However, if a portion of the channel sensing results for the T_sl interval is determined to be busy, the counter value is maintained as it is and channel sensing continues until the channel sensing result for the T_d-long deferral interval unit becomes idle again. In the above, the T_d-long deferral interval is configured as m_p consecutive T_sl intervals starting from T_f=16us, where m_p is a value determined by priority class p and may be the time interval in which channel sensing is performed at T_sl=9us.

[0255] According to an embodiment of the present disclosure, when a terminal occupies a channel via Type 1 SL channel access and is not ready to transmit a sidelink transmission, the terminal may configure a T_d long deferral interval and a T_sl long sensing interval immediately before the sidelink transmission it is ready to transmit, and if both are idle, the terminal may immediately perform the sidelink transmission. Here, if either of the two is busy, the terminal may perform Type 1 SL channel access again.

[0256] For example, if sidelink transmission is difficult when channel sensing ends (e.g., when channel sensing ends after the start of sidelink transmission), the terminal may reselect the sidelink transmission resource.

[0257] On the other hand, for two transmissions (from two terminals) that start transmitting at the same time, a collision may occur if the two terminals do not recognize each other's transmissions and the channel sensing results are all determined to be idle.

[0258] On the other hand, if the start time is adjusted randomly through CP extension and / or single or multiple start symbol puncturing, the channel sensing results for each transmission may be determined to be partly busy, which may result in a problem where FDM between different resources within the same RB set is not supported.

[0259] On the other hand, in the case of sidelink mode 2 resource (re)selection, the problem of overlapping transmission resources for different transmissions is avoided or mitigated via reserved resource information indicated in previous transmissions.

[0260] For example, the terminal may adjust the transmission start position of the actual sidelink channel / signal so that the CP extension is applied from the first symbol during sidelink transmission (e.g., PSCCH / PSSCH transmission, PSFCH transmission, and / or S-SSB transmission), and the length of the CP extension may be selected from among candidates (pre-) set and / or pre-defined candidates for each CAPC and / or SL priority value.

[0261] Figure 15 illustrates how the CP extension is applied according to one embodiment of the present disclosure. The embodiment of Figure 15 can be combined with various embodiments of the present disclosure.

[0262] Referring to Figure 15, a first resource including at least one slot is shown. It is assumed that CP extension is applied to the first resource. For example, one slot may consist of 12 or 14 symbols, and an extended CP may be used when one slot consists of 12 symbols. For example, an extended CP can only be used when the SCS is 60 kHz. When an extended CP is used, the time length of one symbol may be relatively longer than when a normal CP is used.

[0263] For example, when a CP extension is applied to a first resource, the first resource-based transmission starts at an extended symbol time that is at least one symbol ahead in time from the first symbol of the first slot of the first resource. Specifically, depending on the index associated with the CP extension, the first resource-based transmission starts Δi after the extended symbol interval (i.e., the start of the symbol Ci ahead of the first slot of the resource) based on Ci and Δi associated with each index. Here, for example, the maximum value of the number of at least one symbol (Ci) is set for each SCS used for SL transmission.

[0264] For example, application of CP extension has the effect of reducing inter-symbol interference (ISI). For example, the signal transmitted in the extended symbol interval may be a dummy signal generated based on SL transmission performed based on the first resource. The length of CP extension described or exemplified below refers to Ci in FIG. 15.

[0265] For example, from among the candidates for the CP extension length, the terminal may select a CP extension length as implemented by the terminal. For example, from the candidate values ​​for the CP extension length, the terminal may randomly select a CP extension length. For example, from among the candidates for the CP extension length, the terminal may select the shortest and / or longest CP extension length as the CP extension length. For example, from among the candidates for the CP extension length, the terminal may select the CP extension length indicated or configured for the reserved resources of another terminal in the slot in which SL transmission is performed as the CP extension length. For example, the CP extension length for the reserved resources of the other terminal may be a value indicated via the SCI and / or PSCCH / PSSCH, and / or may be a CP extension length linked to the parameters derived by the terminal from the SL priority value and / or CAPC value.

[0266] On the other hand, the terminal can (pre)configure candidate values ​​for multiple CP extension lengths and use a default CP extension value in specific situations. For example, the specific situation may include a case where the terminal is (pre)configured for each resource pool, transmission SL priority, and / or transmission CAPC to be allowed to use the default CP extension. For example, the specific situation may include a case where all terminals use all PRBs in an RB set for PSCCH / PSSCH transmission for a resource pool and / or a case where the terminal uses all PRBs in an RB set when transmitting an SL channel. For example, the specific situation may include a case where terminals share a COT, a case where a Type 2 series channel access procedure is used, and / or a case where channel sensing is omitted. For example, the specific situation may be the CP extension length used by the terminal for reserved resources of other terminals.

[0267] For example, the default CP extension length may be a value corresponding to a specific index value (e.g., index 0) among (pre)configured candidate values ​​for the CP extension. For example, the default CP extension length may be a CP extension length configured or indicated for resources reserved by other terminals in a slot in which the terminal performs SL transmission. For example, even if candidate values ​​for the CP extension length differ depending on the CAPC and / or SL priority value, the default CP extension length value may be the same (regardless of the CAPC and / or SL priority value).

[0268] On the other hand, for additional resources for S-SSB transmission, overlap with the time region of a particular resource pool is permitted for the additional resources. For example, for (additional) S-SSB time resources that overlap in time with the time region of a particular resource pool, a terminal may want to expect the S-SSB transmission and / or reception resources to be FDM'd within the same RB set as the PSCCH / PSSCH and / or PSFCH resources. For example, for (additional) S-SSB time resources that overlap in time with the time region of a particular resource pool, a terminal may expect the S-SSB transmission and / or reception resources not to be FDM'd within the same RB set as the PSCCH / PSSCH and / or PSFCH resources.

[0269] For example, when the UE (re)selects Mode 2 resources, it may exclude frequency resources in the slot and / or RB set to which the S-SSB resource belongs from the available resource candidate set. For example, the UE may expect that a slot including a PSFCH resource and a slot including an S-SSB resource overlap. For example, the UE may expect that a slot including a PSFCH resource and a slot including an S-SSB resource do not overlap. For example, among slots including S-SSB resources, a slot including a PSFCH resource may be replaced with another slot that does not include a PSFCH resource. That is, in this case, the UE may expect / perform PSCCH / PSSCH transmission and / or reception in the PSFCH time resource. This is because an additional AGC period is required in the middle if the UE receives an S-SSB in the PSFCH time domain.

[0270] For example, if multiple CP extension lengths are configured for a PSCCH / PSSCH transmission and / or the PSCCH / PSSCH transmission is performed on (additional) S-SSB time resources, the CP extension length value for the PSCCH / PSSCH transmission of the terminal may be the same as the CP extension length value for the S-SSB transmission. For example, if multiple CP extension lengths are configured for a PSCCH / PSSCH transmission and / or the PSCCH / PSSCH transmission is performed on (additional) S-SSB time resources, the terminal may determine the CP extension length value for the PSCCH / PSSCH transmission of the terminal to be the same as the CP extension length value for the S-SSB transmission. For example, the terminal may use a default CP extension length value and / or the CP extension length value for the S-SSB transmission when performing a PSCCH / PSSCH transmission on S-SSB time resources.

[0271] For example, if multiple CP extension lengths are configured for a PSCCH / PSSCH transmission and / or the PSCCH / PSSCH transmission is performed on (additional) S-SSB time resources, the terminal may select a CP extension length value for the PSCCH / PSSCH transmission that is shorter than the CP extension length for the S-SSB transmission. For example, if multiple CP extension lengths are configured for a PSCCH / PSSCH transmission and / or the PSCCH / PSSCH transmission is performed on (additional) S-SSB time resources, the terminal may select a CP extension length value for the PSCCH / PSSCH transmission that is shorter than the CP extension length for the S-SSB transmission.

[0272] For example, if the S-SSB transmission occurs in additional S-SSB resources and / or in an area that overlaps in time with a particular resource pool, the terminal may use the default CP extension length for the PSCCH / PSSCH when transmitting the S-SSB.

[0273] For example, when S-SSB transmission occurs in additional S-SSB resources, when S-SSB transmission occurs in an area that overlaps in time with a specific resource pool, the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission can commonly use the minimum value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0274] For example, when S-SSB transmission occurs in additional S-SSB resources, when S-SSB transmission occurs in an area that overlaps in time with a specific resource pool, the maximum value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission.

[0275] For example, when S-SSB transmission occurs in additional S-SSB resources, when S-SSB transmission occurs in an area that overlaps in time with a specific resource pool, the CP extension length for the PSCCH / PSSCH transmission and / or S-SSB transmission can be the CP extension length of the channel with the higher priority value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0276] For example, when S-SSB transmission occurs in additional S-SSB resources, when S-SSB transmission occurs in an area that overlaps in time with a specific resource pool, the CP extension length for the PSCCH / PSSCH transmission and / or S-SSB transmission can be the CP extension length of the channel with the lower priority value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0277] For example, if multiple CP extension lengths are set for PSCCH / PSSCH transmission, the smallest CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission.

[0278] For example, if multiple CP extension lengths are set for PSCCH / PSSCH transmission, the maximum value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission.

[0279] For example, when multiple CP extension lengths are set for PSCCH / PSSCH transmission, the CP extension length for the channel with the highest priority value can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0280] For example, when multiple CP extension lengths are set for PSCCH / PSSCH transmission, the CP extension length for a channel with a lower priority value can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0281] For example, when PSCCH / PSSCH transmission is performed in (additional) S-SSB time resources, the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission can be the minimum of the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0282] For example, when PSCCH / PSSCH transmission is performed in (additional) S-SSB time resources, the maximum value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission can be commonly used as the CP extension length for PSCCH / PSSCH transmission and / or S-SSB transmission.

[0283] For example, when PSCCH / PSSCH transmission is performed in (additional) S-SSB time resources, the CP extension length for the PSCCH / PSSCH transmission and / or S-SSB transmission can be the CP extension length of the channel with the higher priority value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0284] For example, when PSCCH / PSSCH transmission is performed in (additional) S-SSB time resources, the CP extension length for the PSCCH / PSSCH transmission and / or S-SSB transmission can be the CP extension length of the channel with the lower priority value among the CP extension length for PSCCH / PSSCH transmission, the CP extension length for S-SSB transmission, and the default CP extension length for PSCCH / PSSCH transmission.

[0285] According to embodiments of the present disclosure, the combinations may differ depending on whether S-SSB and PSCCH / PSSCH transmissions are in the same RB set and / or whether a guard band exists within an SL BWP (between RB sets). For example, the method is limited to be used when there is no guard band within an SL BWP (between RB sets). For example, the method is limited to be used when there is a guard band within an SL BWP (between RB sets). For example, the method is limited to be used when S-SSB and PSCCH / PSSCH transmissions are in the same RB set.

[0286] On the other hand, for example, for a specific SCS (e.g., 30 kHz, 60 kHz, etc.), the possible length of the CP extension may exceed the length of a single symbol and include values ​​within multiple symbol intervals. For example, whether or not to permit a CP extension length greater than the length of a single symbol is determined (or set) through (pre)configuration. For example, whether or not to permit a CP extension length greater than the length of a single symbol can be set to activated / deactivated. For example, the permission of a CP extension length greater than the length of a single symbol may be such that a specific candidate value is permitted to have a value greater than the length of a single symbol depending on the configuration of candidate CP extension lengths.

[0287] For example, when a terminal (re)selects resources for PSCCH / PSSCH transmission where the length of the CP extension is greater than the length of a single symbol, the terminal can exclude from the available candidate resource set the entire resources in the slot immediately following the resource slot reserved by another terminal.

[0288] Or, for example, when a terminal (re)selects resources for PSCCH / PSSCH transmission where the length of the CP extension is greater than the length of a single symbol, it can exclude some resources in the slot immediately following the resource slot reserved by another terminal from the available candidate resource set.

[0289] Or, for example, when a terminal (re)selects resources for PSCCH / PSSCH transmission where the length of the CP extension is greater than the length of a single symbol, the terminal can exclude resources in an RB set to which resources reserved by other terminals belong from the available candidate resource set.

[0290] For example, the resource exclusion operation may be limited to being performed when the RSRP measurement value for the reserved resource is equal to or exceeds the RSRP threshold, or for example, the resource exclusion operation may be limited to being performed for candidate resources that overlap in frequency domain with the reserved resource, or for example, the resource exclusion operation may be limited to being performed for candidate resources in the same RB set as the reserved resource.

[0291] For example, if its reserved resources overlap in the frequency domain with the slot immediately following the reserved resource slot of another terminal, the terminal can limit the candidate values ​​of the CP extension length for the PSCCH / PSSCH to within a single symbol. For example, if its reserved resources overlap in the frequency domain with resources in the same RB set as the reserved resources of another terminal, the terminal can limit the candidate values ​​of the CP extension length for the PSCCH / PSSCH to within a single symbol. For example, if its reserved resources overlap in the frequency domain with the reserved resources of another terminal, the terminal can limit the candidate values ​​of the CP extension length for the PSCCH / PSSCH to within a single symbol.

[0292] For example, if there are no or no confirmed reserved resources for other terminals before the PSCCH / PSSCH transmission resources of the terminal (in the same RB set and / or in overlapping frequency), the length of the CP extension for the PSCCH / PSSCH may be greater than the length of a single symbol. Alternatively, for example, if the time required for channel sensing is secured, the length of the CP extension for the PSCCH / PSSCH may be greater than the length of a single symbol. For example, if the spacing between SL resources belonging to a resource pool is greater than the length of a single symbol and / or is greater than the length of a single slot, the length of the CP extension for the PSCCH / PSSCH may be greater than the length of a single symbol.

[0293] For example, among the candidate values ​​for when the length of the CP extension is within the length of a single symbol and the candidate values ​​for when the length of the CP extension is greater than (exceeds) the length of a single symbol, there may be candidate values ​​that have the same (partial) CP extension value or SL channel start position for CP extension application associated with each candidate value.

[0294] For example, the candidate values ​​for the case where the CP extension length is within the length of a single symbol may be a subset of the candidate values ​​for the case where the CP extension length is equal to or greater than the length of a single symbol. For example, the candidate values ​​for the case where the CP extension length is equal to or greater than the length of a single symbol may include values ​​for a time point 16 us or later, based on a time point a certain symbol before the start of the SL channel.

[0295] For example, when determining candidate values ​​for cases where the CP extension length is greater than (exceeds) the length of a single symbol based on 60 kHz SCS, a point 16 us or later based on a point 4 symbols prior to the start of the SL channel and / or a point (multiple points) 9 us or later from the point are determined, and actual CP extension candidate values ​​may be all or part of the CP extension length or point existing at a point 2 symbols prior to the start of the SL channel or later.

[0296] For example, when candidate values ​​are determined for the case where the CP extension length is equal to or greater than the length of a single symbol based on a 60 kHz SCS, a time point 16 us or later based on a time point two symbols prior to the start of the SL channel and / or a time point (or multiple times) 9 us or later from that time point are determined. For example, candidate values ​​for the case where the CP extension length is equal to or greater than the length of a single symbol based on a 60 kHz SCS and candidate values ​​for the case where the CP extension length is equal to or greater than the length of a single symbol based on a 30 kHz SCS may be the same or may overlap. For example, candidate values ​​for CP extension lengths that are equal to or greater than the length of a single symbol for a 30 kHz SCS and / or a 60 kHz SCS may partially overlap and / or include candidate values ​​for CP extension lengths that are equal to or less than the length of a single symbol for a 15 kHz SCS.

[0297] 16 illustrates a maximum value of the CP extension length determined depending on the SCS used for SL transmission according to one embodiment of the present disclosure. The embodiment of FIG. 16 can be combined with various embodiments of the present disclosure.

[0298] 16 shows a first resource, a second resource, and a third resource based on which SL transmission is performed with SCSs of 15 kHz, 30 kHz, and 60 kHz, respectively. It is assumed that an extended CP is applied to the first resource, the second resource, and the third resource. It is assumed that an extended CP is used for the third resource because the SCS used for the third resource-based SL transmission is 60 kHz.

[0299] For example, the maximum length of the CP extension applied to the first resource may be 1 symbol. Also, the maximum length of the CP extension applied to the second resource may be 2 symbols. Here, the maximum length of the CP extension applicable to the first resource (1 symbol) may be the same as the maximum length of the CP extension applicable to the second resource (2 symbols). This is because the SCS between the first resource-based transmission and the second resource-based transmission is twice as different, and therefore the time length for one symbol is half that of the first resource.

[0300] For example, in the CP extension applied to the third resource, the maximum length of the CP extension may be 2 symbols. Even though the SCS between the second resource-based transmission and the third resource-based transmission is twice as large, the duration of two symbols associated with the third resource may be longer than the duration of one symbol associated with the second resource because an extended CP is used on the third resource. Therefore, similar to the relationship between the first and second resources, if the maximum length of the CP extension associated with the third resource is defined to be twice the maximum length of the CP extension associated with the second resource, a problem may occur in which excessive preemption opportunities are given to the third resource-based transmission in the shared spectrum.

[0301] Therefore, the embodiment of FIG. 16 proposes an embodiment in which the maximum length of the CP extension is limited to 2 symbols in SL transmission in which a 60 kHz SCS is used.

[0302] For example, when the CP extension length is greater than or equal to the length of a single symbol based on 30 kHz SCS and / or 60 kHz SCS, candidate values ​​for the CP extension length may include a point 16 us or later based on a point one symbol prior to the start of the SL channel and / or a point(s) 9 us later than the 16 us point and / or all or part of a point(s) 9 us earlier than the 16 us point and / or a point one symbol prior to the start of the SL channel.

[0303] In the various embodiments of the present disclosure, 16 us and 9 us are merely one embodiment, and the concept of the present disclosure can be extended and applied to other combinations of values ​​or combinations having the same value.

[0304] For example, even when the UE uses candidate values ​​for when the CP extension length is equal to or greater than the length of a single symbol based on the 30 kHz SCS and / or 60 kHz SCS, a default CP extension value or at least one candidate value can be determined / selected from candidate values ​​for when the CP extension length is equal to or less than the length of a single symbol. For example, the default CP extension value is determined as a value within a certain symbol from the start of SL transmission. For example, for a specific SCS (e.g., 30 kHz or 60 kHz), whether the maximum CP extension value is within one symbol or longer than the length of one symbol can be (pre)set for each resource pool, COT inside, COT outside, priority value, and / or CAPC value. Or, for example, the length for the maximum CP extension value can be (pre)set for each resource pool, COT inside, COT outside, priority value, and / or CAPC value.

[0305] For example, when a terminal attempts transmission for a single PSCCH / PSSCH, the CP extension value that the terminal can use may be greater than the length of one symbol interval. For example, if the PSCCH / PSSCH transmission satisfies the COT condition within the COT interval and utilizes the COT, the CP extension value that the terminal can use may be greater than the length of one symbol interval. For example, if the PSCCH / PSSCH transmission is outside the COT or is a transmission for COT initialization, the CP extension value that the terminal can use may be greater than the length of one symbol interval. For example, if the PSCCH / PSSCH transmission is the first transmission of an MCSt and / or the first transmission of an SL transmission burst, the CP extension value that the terminal can use may be greater than the length of one symbol interval. For example, this operation is performed when the SCS is 30 kHz and / or 60 kHz and / or when the CP extension length greater than one symbol is activated via (pre)configuration.

[0306] For example, if the PSCCH / PSSCH transmission is an intermediate transmission of an MCSt and / or an intermediate transmission of an SL transmission burst, the CP extension value that the UE can use may be greater than the length of one symbol interval. For example, the intermediate transmission of an MCSt or an SL transmission burst may include a case where there is an SL channel in which actual transmission was performed before the current time point. For example, this operation is performed when the SCS is 30 kHz and / or 60 kHz and / or when the case where the CP extension length is greater than one symbol is activated via (pre)configuration.

[0307] On the other hand, for a single PSCCH / PSSCH transmission, some frequency regions may be within the COT and some frequency regions may be outside the COT (or such a case may be supported). For example, the terminal may not expect such a situation. For example, the terminal may perform resource (re)selection according to the COT information in such a situation, and may ensure that all allocated resources for the single PSCCH / PSSCH transmission are within the COT in the time and / or frequency domain or outside the COT in the time and / or frequency domain. For example, in such a situation, the CP extension length for the single PSCCH / PSSCH transmission may be the same value in all RB sets of allocated resources. For example, the terminal may determine (or configure) that the CP extension length for the single PSCCH / PSSCH transmission is the same value in all RB sets of allocated resources in such a situation.

[0308] For example, the UE may determine a channel access type for each RB set, for example, the UE may use a type 2 series channel access procedure for transmission resources within the COT and / or a type 1 and / or multi-channel access procedure for transmission resources outside the COT.

[0309] For example, if a terminal can perform a Type 2 sequence for at least one of the RB sets allocated for a single PSCCH / PSSCH transmission (if at least one of the allocated RB sets is within the COT in the time and / or frequency domain and / or if the COT usage conditions are met), the terminal can use the Type 2 sequence channel access procedure for all allocated RB sets.

[0310] For example, if a terminal performs a Type 1 sequence for at least one of the assigned RB sets for a single PSCCH / PSSCH transmission, the terminal may use the Type 1 sequence of channel access procedures and / or multiple channel access procedures for all assigned RB sets (and / or RB sets included within the COT in the time and / or frequency domain).

[0311] For example, if a terminal uses a Type 2 channel access procedure for all RB sets allocated for a single PSCCH / PSSCH transmission, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol. For example, if all RB sets allocated for a single PSCCH / PSSCH transmission are within the COT in the time and / or frequency domain, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol. For example, if the COT usage condition is satisfied for all RB sets allocated for a single PSCCH / PSSCH transmission, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol.

[0312] For example, when a terminal uses a Type 2 channel access procedure for at least one RB set allocated for a single PSCCH / PSSCH transmission, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol. For example, if at least one RB set allocated for a single PSCCH / PSSCH transmission is within the COT in the time and / or frequency domain, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol. For example, if a COT usage condition is satisfied for at least one RB set allocated for a single PSCCH / PSSCH transmission, the length of the maximum CP extension for the PSCCH / PSSCH transmission is limited to within the length of one symbol.

[0313] On the other hand, the set of candidate values ​​for the starting position of the CP extension may differ depending on whether the SL transmission is inside or outside the COT. Also, the method for selecting the starting position of the CP extension may differ depending on the MCS and / or the transmission recognition at the beginning, middle, and / or end of the SL transmission burst.

[0314] For example, if at least one allocated RB set for a single PSCCH / PSSCH transmission exists within the COT resource region, the starting position value of the CP extension is determined based on a candidate set of starting positions of the CP extension relative to the inside of the COT.

[0315] For example, if at least one allocated RB set for a single PSCCH / PSSCH transmission exists outside the COT resource region, the start position value of the CP extension is determined based on a candidate set of start positions of the CP extension for outside the COT.

[0316] For example, if some RB sets allocated for a single PSCCH / PSSCH transmission are located within the COT resource region and some RB sets of the other RB sets are located outside the COT resource region, the UE may select the start position of a CP extension for each RB set group (at least a plurality of RB sets within the COT and a plurality of RB sets outside the COT), and then select the earliest or latest value in time among the start positions of the CP extension for each allocated RB set. For example, selecting the earliest value in time may be advantageous in further ensuring transmission opportunities for the PSSCH transmission. For example, selecting the latest value in time may be advantageous in ensuring fairness (in terms of channel occupancy on a shared spectrum) for resources that are FDM-multiplexed before, after, and / or at the same time as the PSSCH transmission.

[0317] For example, if some RB sets allocated for a single PSCCH / PSSCH transmission are located within the COT resource region and some of the other RB sets are located outside the COT resource region, and if the starting position of the default CP extension is used for at least one RB set, the terminal can apply the starting position of the default CP extension to all allocated RB sets for the PSCCH / PSSCH transmission.

[0318] For example, when some RB sets allocated for a single PSCCH / PSSCH transmission are located within the COT resource region and some of the other RB sets are located outside the COT resource region, if the PSCCH / PSSCH transmission in at least one RB set is an intermediate transmission of an MCSt and / or an intermediate transmission of an SL transmission burst, the starting position of the CP extension for the intermediate transmission is also applied to the other RB sets.

[0319] On the other hand, the time required for a terminal to switch from transmit to receive operation (transmit-receive switch time) and the time required for a terminal to switch from receive to transmit operation (receive-transmit switch time) are values ​​conforming to the FR (frequency range) of 1 to 13 us, and the switch times may not be guaranteed depending on the CP extension and / or LBT operation.

[0320] For example, the terminal may consider the transmit-receive switch time, the receive-transmit switch time, the length of the CP extension, and / or the length of the reference LBT interval when (re)selecting resources.

[0321] For example, when (re)selecting a transmission resource, if the terminal needs to perform SL transmission (including CP extension) within a time interval that is smaller than the receive-transmit switch time from the last time the terminal received the SL channel, the terminal can exclude the corresponding candidate resource from the available resource set.

[0322] For example, when (re)selecting a transmission resource, if the terminal needs to perform SL transmission within a time interval that is less than the transmit-receive switch time from the start of the terminal's SL channel reception (with or without CP extension), the terminal can exclude the corresponding candidate resource from the available resource set.

[0323] For example, the length of the CP extension may be the length of the CP extension that the terminal actually intends to use, a (pre)set reference value, a value determined by the terminal through implementation, and / or the minimum, maximum or average value of candidate CP extension lengths.

[0324] For example, the terminal may omit all or part of the SL channel transmission in the transmission resource selected depending on the transmit-receive switch time, receive-transmit switch time, CP extension length, and / or reference LBT interval length, and / or may report and / or reselect the resource for the transmission to a higher layer.

[0325] For example, if a terminal needs to perform SL transmission (including CP extension) within a time interval that is shorter than the receive-transmit switch time from the last point in time after the terminal's SL channel reception, the terminal can omit the SL channel transmission and / or reselect resources. For example, if a terminal needs to perform SL transmission within a time interval that is shorter than the transmit-receive switch time from the start point in time before the terminal's SL channel reception (with or without CP extension), the terminal can omit the SL channel transmission and / or reselect resources. For example, the terminal can omit a scheduled or configured CP extension operation when transmitting the SL channel in the above situation.

[0326] For example, the terminal may omit all or part of the SL channel reception depending on the transmit-receive switch time, the receive-transmit switch time, the length of the CP extension, and / or the length of the reference LBT interval.

[0327] For example, if the terminal needs to perform SL transmission (including CP extension) within a time interval that is less than the receive-transmit switch time from the last time point of the terminal's SL channel reception, the terminal may omit reception of the entire or a part of the SL channel. For example, the part of the area may be an area that ensures at least the missing receive-transmit switch time from the last time point of the SL channel reception.

[0328] For example, if the terminal needs to perform SL transmission within a time interval that is less than the transmit-receive switch time from the start of the terminal's SL channel reception (with or without the CP extension), the terminal may omit reception of the entire or a portion of the SL channel. For example, the portion of the area may be the entire or a portion of the CP extension area for SL channel reception.

[0329] For example, the length of the CP extension may differ between the first, intermediate, and / or final transmissions of an MCSt, and the first, intermediate, and / or final transmissions may be separated based on the actual transmission of the terminal. That is, for example, if the terminal is unable to perform the actual transmission in the first transmission of a scheduled MCSt due to an LBT failure and / or resource (re)selection, the CP extension selection procedure and value for the existing first transmission may be used for the transmission following the transmission that was unable to be performed in the MCSt.

[0330] For example, when performing a resource (re)selection operation, if there are no resources for MCSt transmission in the available resource set after excluding avoided resources corresponding to non-monitored slots in the initial available resource set (candidate resources that overlap with resources in slots derived from candidate values ​​of the resource pool and / or (pre)configured resource reservation period from slots in which sensing could not be performed for terminal transmission within the sensing window), the terminal can cancel the process of excluding avoided resources corresponding to non-monitored slots in the initial available resource set.

[0331] For example, when performing a resource (re)selection operation, if the number of resources for MCSt transmission in the available resource set after excluding avoided resources corresponding to non-monitored slots in the initial available resource set is below or equal to a certain level (e.g., a (pre)set value), the terminal can cancel the process of excluding avoided resources corresponding to non-monitored slots in the initial available resource set.

[0332] For example, when performing a resource (re)selection operation, if, after excluding avoided resources corresponding to non-monitored slots in the initial available resource set, the ratio of the number of available resources for MCSt transmission to the total resources within the resource selection window or the number of MCSt resources (before the elimination of the avoided resources) is below or equal to a certain level (e.g., a (pre)set value), the terminal can cancel the process of excluding avoided resources corresponding to non-monitored slots in the initial available resource set.

[0333] For example, the process of excluding the avoided resources corresponding to the non-monitored slots may be limited to be executed when the terminal's selected resources are in the form of MCSt, or may be limited to be applied in the same way when the terminal's selected resources are in the form of single slot transmission, and / or the possibility of resource exclusion and definition execution may be determined independently from whether the terminal's selected resources are in the form of MCSt.

[0334] In various embodiments of the present disclosure, transmissions using Type 2 channel access may represent transmissions within the COT interval, and / or transmissions using Type 1 channel access may represent transmissions outside the COT or during COT initialization.

[0335] In various embodiments of the present disclosure, the method may be applied differently depending on the SCS, the RB set, the RB set size, and / or the presence or absence of guard bands in the SL carrier or SL BWP.

[0336] Various embodiments of the present disclosure may vary and / or be (pre)configured for each resource pool, transmission outside the resource pool, transmission inside the resource pool, QoS parameters, CAPC, SL priority, transmission procedure inside the COT (at COT initialization), outside the COT (at COT initialization), within the MCSt, SL channel type, RB set, SL BWP, SL carrier, congestion control level, transmission operation, reception operation, transmission power level, transmission start time, channel access procedure type for transmission, LBT failure rate, whether the terminal is a COT initiator terminal, whether the terminal is a COT responded terminal, whether the terminal is other terminal, cast type, whether SL HARQ-ACK feedback is activated, HARQ-ACK feedback option, and / or the number of transmission attempts for the same information or TB.

[0337] For example, in an embodiment of the present disclosure, (pre)setting is performed for each of the resource pool, transmission outside the resource pool, transmission inside the resource pool, QoS parameters, CAPC, SL priority, inside the COT (at COT initialization), outside the COT (at COT initialization), transmission procedure within the MCSt, SL channel type, RB set, SL BWP, SL carrier, congestion control level, transmission operation, reception operation, transmission power level, transmission start time, channel access procedure type for transmission, LBT failure rate, whether the terminal is a COT initiator terminal, whether the terminal is a COT responded terminal, whether the terminal is any other terminal, cast type, whether SL HARQ-ACK feedback is activated, HARQ-ACK feedback option, and / or the number of transmission attempts for the same information or TB.

[0338] According to one embodiment of the present disclosure, the starting position of OFDM symbol l for SCS setting u within a subframe can be determined based on Equation 1.

[0339]

number

[0340] where t^(u)_(start,l) indicates the start position of OFDM symbol l for SCS setting u within a subframe. T(u)_(symb,l-1) may indicate the time length of OFDM symbol l-1. For example, in the case of CP extension of the first OFDM symbol l allocated for PUSCH, SRS, PUCCH, PSCCH / PSSCH, PSFCH, or S-SS / PSBCH block transmission, Equation 2 is applied to the interval preceding the first symbol.

[0341]

number

[0342] The s^(p,u)_(ext) represents a signal function for a time interval preceding the first OFDM symbol l for transmission when CP extension is performed. The T_ext represents the length of time from when transmission starts to the first symbol due to CP extension. For example, in PSCCH and / or PSSCH, PSFCH, and S-SS / PSBCH block transmission, Equation 3 is applied.

[0343]

number

[0344] For example, the parameters in Table 18 can be used in Equation 3. For example, C_i means the number of symbols in time from symbol l that includes the symbol at which transmission starts when CP extension is performed. For example, Δ_i means the length of time from the start of a symbol included in the symbol at which transmission starts when CP extension is performed to the time at which transmission starts.

[0345] [Table 18]

[0346] For example, in Equation 1, Equation 2, and Equation 3, u denotes an SCS setting value for OFDM symbol (l), which is an element of {0, 1, N^(subframe, u)_(slot)*N^(slot)_(symbol)-1}, and p denotes an index of an antenna port.

[0347] According to one embodiment of the present disclosure, a terminal may apply a CP extension to the first symbol of an S-SS / PSBCH block and within the first one or two symbols before the first symbol, or may apply a CP extension to the first symbol of a PSFCH and within the first one or two symbols before the first symbol.

[0348] LBT operation is performed to secure transmission opportunities in unlicensed bands. Channel sensing is performed on the channel sensing window from a point in time preceding the channel sensing window length at the time of the transmission resource, and transmission is performed only if the result is idle. For example, CP extension is an operation performed to ensure the reception performance of the receiving end in FDM transmission, and in shared spectrum, channel preemption gains occur because some transmission resources may advance in time. In existing technology, there is no definition of CPE candidate values ​​when the length of the CPE interval is within a maximum of two symbols in 60 kHz SCS, and there are problems with the CAP type and CPE configuration method being ambiguous when only some RB sets for a single PSCCH / PSSCH transmission are within the shared COT.

[0349] For example, when transmission is performed based on a 60 kHz SCS in a shared spectrum, the maximum number of symbols associated with a CPE is limited to 2. This is because when a 60 kHz SCS is used, an extended CP is used, but if the CP extension is extended to the maximum number of symbols, up to 4, excessive preemption is permitted for a single terminal in channel sensing, and resources pre-empted via the CPE may be wasted because they are not used for data transmission.

[0350] For example, the CPE candidate value within a maximum of two symbols of the 60 kHz SCS can be set to the same as the CPE candidate value within a maximum of one symbol of the 30 kHz SCS. For example, if only a portion of the RB set for a single PSCCH / PSSCH transmission is within a shared COT, the type 1 CAP or multi-channel access procedure can be used for the entire RB set. For example, even if a reserved resource of another UE is detected for a portion of the RB set for a single PSCCH / PSSCH transmission, a default CPE can be used for the entire RB set.

[0351] 17 illustrates a procedure for a first device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 17 can be combined with various embodiments of the present disclosure.

[0352] 17, in step S1710, a first device may perform channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum. In step S1720, the first device may perform sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource. For example, based on a cyclic prefix (CP) extension being applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, the maximum number of symbols used for the CP extension may be 2.

[0353] For example, the SL transmission may include at least one of a sidelink synchronization signal block (S-SSB) transmission, a physical sidelink feedback channel (PSFCH) transmission, a physical sidelink control channel (PSCCH) transmission, or a physical sidelink shared channel (PSSCH) transmission.

[0354] For example, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension can be applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0355] For example, based on whether the SL transmission is a PSCCH transmission or a PSSCH transmission, the CP extension can be applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0356] For example, the first resource is included in a first resource block (RB) set and a second RB set.

[0357] For example, the CAP may be a Type 1 CAP based on the need to perform a Type 1 CAP on at least one of the first RB set and the second RB set.

[0358] For example, based on at least one of the first RB set and the second RB set being outside a COT (channel occupancy time) interval, the CP extension is performed based on the RB set outside the COT interval.

[0359] For example, the CP extension may be a default CP extension based on the need to apply a default CP extension to at least one of the first RB set and the second RB set.

[0360] For example, there may be a guard band between the first RB set and the second RB set.

[0361] For example, based on the SCS associated with the SL transmission being 30 KHz, the maximum number of symbols used for the CP extension may be two.

[0362] For example, the maximum number of symbols used for the CP extension may be 1 based on the SCS associated with the SL transmission being 15 KHz.

[0363] For example, the first resource may be a resource in a resource pool, an additional S-SSB resource may be configured, and an S-SSB transmission may not be FDM'd with the SL transmission during the time duration of the additional S-SSB resource.

[0364] For example, the resource pool and the additional S-SSB resource may overlap in the time domain, and the first resource may not be included in the time interval where the resource pool and the additional S-SSB resource overlap.

[0365] The above-described embodiment may be applied to various devices described below. For example, the processor 102 of the first device 100 may perform channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum. Then, the processor 102 of the first device 100 may control the transceiver 106 to perform sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource. For example, based on a cyclic prefix (CP) extension being applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, the maximum number of symbols used for the CP extension may be 2.

[0366] According to one embodiment of the present disclosure, there is provided a first device for wireless communication. For example, the first device may include at least one transceiver; at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions causing the first device to perform operations based on the instructions being executed by the at least one processor. For example, the operations may include: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, wherein a cyclic prefix (CP) extension is applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission is 60 kHz, and the maximum number of symbols used for the CP extension is 2.

[0367] For example, the SL transmission may include at least one of a sidelink synchronization signal block (S-SSB) transmission, a physical sidelink feedback channel (PSFCH) transmission, a physical sidelink control channel (PSCCH) transmission, or a physical sidelink shared channel (PSSCH) transmission.

[0368] For example, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension can be applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0369] For example, based on whether the SL transmission is a PSCCH transmission or a PSSCH transmission, the CP extension is applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0370] For example, the first resource is included in a first resource block (RB) set and a second RB set.

[0371] For example, the CAP may be a Type 1 CAP based on the need to perform a Type 1 CAP on at least one of the first RB set and the second RB set.

[0372] For example, based on at least one of the first RB set and the second RB set being outside a COT (channel occupancy time) interval, the CP extension is performed based on the RB set outside the COT interval.

[0373] For example, the CP extension may be a default CP extension based on the need to apply a default CP extension to at least one of the first RB set and the second RB set.

[0374] For example, there may be a guard band between the first RB set and the second RB set.

[0375] For example, based on the SCS associated with the SL transmission being 30 KHz, the maximum number of symbols used for the CP extension may be two.

[0376] For example, the maximum number of symbols used for the CP extension may be 1 based on the SCS associated with the SL transmission being 15 KHz.

[0377] For example, the first resource may be a resource in a resource pool, an additional S-SSB resource may be configured, and an S-SSB transmission may not be FDM'd with the SL transmission during the time duration of the additional S-SSB resource.

[0378] For example, the resource pool and the additional S-SSB resource may overlap in the time domain, and the first resource may not be included in the time interval where the resource pool and the additional S-SSB resource overlap.

[0379] According to an embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal. For example, the apparatus may include at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions causing the first terminal to perform an operation based on the instructions being executed by the at least one processor. For example, the operation may include: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, where a cyclic prefix (CP) extension is applied to the first resource and a subcarrier spacing (SCS) associated with the SL transmission is 60 kHz, and the maximum number of symbols used for the CP extension is 2.

[0380] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions, for example, the instructions, when executed, cause a first device to: perform channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and perform a sidelink (SL) transmission based on the channel sensing result being IDLE and the first resource, where a cyclic prefix (CP) extension is applied to the first resource and based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, a maximum number of symbols used for the CP extension may be 2.

[0381] 18 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 18 can be combined with various embodiments of the present disclosure.

[0382] 18 , in step S1810, a second device may receive a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum. For example, the SL transmission may be performed based on a result of channel sensing for a channel access procedure (CAP) performed on the first resource being idle, a cyclic prefix (CP) extension may be applied to the first resource, and a subcarrier spacing (SCS) associated with the SL transmission may be 60 kHz, so that the maximum number of symbols used for the CP extension may be 2.

[0383] For example, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension can be applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0384] The above-described embodiments may be applied to various devices described below. For example, the processor 202 of the second device 200 may control the transceiver 206 to receive a sidelink (SL) transmission from the first device 100 based on a first resource on a shared spectrum. For example, the SL transmission may be performed on the first resource based on a result of channel sensing for a channel access procedure (CAP) being idle, a cyclic prefix (CP) extension may be applied to the first resource, and a subcarrier spacing (SCS) associated with the SL transmission may be 60 kHz, based on which the maximum number of symbols used for the CP extension may be 2.

[0385] According to an embodiment of the present disclosure, there is provided a second device for wireless communication. For example, the second device may include at least one transceiver; at least one processor; and at least one memory executablely connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform operations. For example, the operations may include: receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum, the SL transmission being performed on the first resource; performing the SL transmission based on a result of channel sensing for a channel access procedure (CAP) being idle; applying a cyclic prefix (CP) extension to the first resource; and based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz, the maximum number of symbols used for the CP extension may be 2.

[0386] For example, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension can be applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

[0387] Various embodiments of the present disclosure may be intercombined.

[0388] An apparatus to which various embodiments of the present disclosure are applied will be described below.

[0389] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed in this document may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0390] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings and descriptions, unless otherwise specified, the same reference numerals in the drawings may represent the same or corresponding hardware blocks, software blocks, or functional blocks.

[0391] 19 illustrates a communication system 1 according to one embodiment of the present disclosure. The embodiment of FIG. 19 can be combined with various embodiments of the present disclosure.

[0392] 19, a communication system 1 to which various embodiments of the present disclosure are applied includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that perform communication using wireless connection technologies (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and are referred to as communication / wireless / 5G devices. Without being limited thereto, the wireless devices may include a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicles may include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of performing inter-vehicle communication, etc. Here, the vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and may be embodied in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. Mobile devices may include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebooks, etc.), etc. Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station or network may be embodied as a wireless device, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0393] Here, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NIT) for low-power communication. Here, for example, NB-IoT technology is an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Furthermore, or generally, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may perform communication based on LTE-M technology. Here, for example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced Machine Type Communication (eMTC). For example, LTE-M technology may be implemented by 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 above-mentioned names. Additionally, or generally, the wireless communication technology implemented in wireless devices 100a-100f herein may include at least one of ZigBee, Bluetooth (registered trademark), and Low Power Wide Area Network (LPWAN), which are considered low-power communications, but are not limited to the above names. As an example, ZigBee technology is based on various standards such as IEEE 802.15.4 and can create personal area networks (PANs) related to small / low-power digital communications, and is referred to by various names.

[0394] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. Artificial Intelligence (AI) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, or may communicate directly with each other (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly with each other (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). Furthermore, an IoT device (for example, a sensor) can directly communicate with another IoT device (for example, a sensor) or another wireless device 100a to 100f.

[0395] Wireless communication / connections 150a, 150b, and 150c can be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 200. Here, the wireless communication / connections may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)). Through the wireless communication / connections 150a, 150b, and 150c, wireless devices and base stations, and base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0396] 20 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 20 can be combined with various embodiments of the present disclosure.

[0397] 20, a first wireless device 100 and a second wireless device 200 may transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} may correspond to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0398] The first wireless 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 may be configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signal and then transmit a wireless signal including the first information / signal via the transceiver 106. The processor 102 may also receive a wireless signal including second information / signal via the transceiver 106 and then store information obtained from signal processing of the second information / signal in the memory 104. The memory 104 may be coupled 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 including instructions for executing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 are part of a communications modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be referred to as a radio frequency (RF) unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0399] The second wireless device 200 includes one or more processors 202, one or more memories 204, and may additionally include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signal and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including fourth information / signal via the transceiver 206 and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 are part of a communications modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver and may be referred to as an RF unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0400] The hardware elements of the wireless devices 100, 200 will be described in more detail below. Without limitation, 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, and SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein.

[0401] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using 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 the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software configured to be executed by one or more processors 102, 202, or stored in one or more memories 104, 204 and run by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions, and / or collections of instructions.

[0402] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may comprise ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. The one or more memories 104, 204 may also be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0403] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and configured to transmit and receive user data, control information, radio signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein via one or more antennas 108, 208. In this document, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, radio 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 an (analog) oscillator and / or a filter.

[0404] 21 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 21 can be combined with various embodiments of the present disclosure.

[0405] 21, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Without being limited thereto, the operations / functions of FIG. 21 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 20. The hardware elements of FIG. 21 may be implemented by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 20. For example, the blocks 1010 to 1060 may be implemented by the processors 102, 202 of FIG. 20. Furthermore, the blocks 1010 to 1050 may be implemented by the processors 102, 202 of FIG. 20, and the block 1060 may be implemented by the transceivers 106, 206 of FIG. 20.

[0406] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 21. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a UL-SCH transmission block, a DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., a PUSCH, a PDSCH).

[0407] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, which may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. Modulation schemes may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) on complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0408] The resource mapper 1050 can map modulation symbols for each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator 1060 generates wireless signals from the mapped modulation symbols, and the generated wireless signals can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an inverse fast fourier Transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, etc.

[0409] In a wireless device, the signal processing process for a received signal may be configured as the inverse of the signal processing processes 1010 to 1060 in FIG. 21. For example, a wireless device (e.g., 100 or 200 in FIG. 20) may receive a wireless signal from the outside through an antenna port / transceiver. The received wireless signal may be converted to a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a Fast Fourier Transform (FFT) module. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0410] 22 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 19). The embodiment of FIG. 22 may be combined with various embodiments of the present disclosure.

[0411] 22, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 20 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 20. For example, the transceiver(s) 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 20. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 140 and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or can store information received from an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0412] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Without being limited thereto, the wireless device may be embodied in the form of a robot (100a in FIG. 19), a vehicle (100b-1, 100b-2 in FIG. 19), an XR device (100c in FIG. 19), a mobile device (100d in FIG. 19), a home appliance (100e in FIG. 19), an IoT device (100f in FIG. 19), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a FinTech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 19), a base station (200 in FIG. 19), a network node, etc. The wireless device may be mobile or fixed depending on the use case / service.

[0413] 22, various elements, components, units / sections, and / or modules within the wireless devices 100 and 200 may be interconnected entirely via a wired interface, or at least some of them may be connected wirelessly via the communication unit 110. For example, within the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected via a wire, and the control unit 120 and a first unit (e.g., 130, 140) may be connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / section, and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured as a set of one or more processors. For example, the control unit 120 may be configured as a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a random access memory (RAM), a dynamic RAM (DRAM), a read only memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0414] The embodiment of FIG. 22 will be described in more detail below with reference to other drawings.

[0415] FIG. 23 illustrates a mobile device according to one embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). The embodiment of FIG. 23 may be combined with various embodiments of the present disclosure.

[0416] 23, portable device 100 may include antenna unit 108, communication unit 110, control unit 120, memory unit 130, power supply unit 140a, interface unit 140b, and input / output unit 140c. Antenna unit 108 may be configured as part of communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130 / 140 in FIG. 22, respectively.

[0417] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control the components of the portable device 100 and perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data, parameters, programs, codes, and instructions required to operate the portable device 100. The memory unit 130 can also store input / output data / information. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the portable device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive and output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0418] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals and transmit the converted wireless signals directly to another wireless device or to a base station. The communication unit 110 may also receive wireless signals from another wireless device or a base station and restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c.

[0419] 24 illustrates a vehicle or an autonomous vehicle according to one embodiment of the present disclosure. The vehicle or autonomous vehicle may be a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc. The embodiment of FIG. 24 may be combined with various embodiments of the present disclosure.

[0420] 24, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 22, respectively.

[0421] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 and perform various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to travel on the ground. The driving unit 140a can include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0422] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. During autonomous driving, the communication unit 110 may non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 may transmit information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0423] The claims described herein may be combined in various ways. For example, technical features of method claims herein may be combined and embodied in an apparatus, and technical features of apparatus claims herein may be combined and embodied in a method. Furthermore, technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in an apparatus, and technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in a method.

[0424] [Claims at the time of international application] [Claim 1] 1. A method for wireless communication by a first device, comprising: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and The method, wherein the maximum number of symbols used for the CP extension is 2 based on the subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 2] 2. The method of claim 1, wherein the SL transmission comprises at least one of a sidelink synchronization signal block (S-SSB) transmission, a physical sidelink feedback channel (PSFCH) transmission, a physical sidelink control channel (PSCCH) transmission, or a physical sidelink shared channel (PSSCH) transmission. [Claim 3] 2. The method of claim 1, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to the first symbol of the first resource, the symbol preceding the first symbol by one symbol (by), or the symbol preceding the first symbol by two symbols (by one). [Claim 4] 2. The method of claim 1, wherein, based on whether the SL transmission is a PSCCH transmission or a PSSCH transmission, the CP extension is applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol. [Claim 5] The method of claim 1 , wherein the first resource is included in a first resource block (RB) set and a second RB set. [Claim 6] The method of claim 5 , wherein the CAP is a Type 1 CAP based on a Type 1 CAP being performed on at least one of the first RB set and the second RB set. [Claim 7] The method of claim 5, wherein the CP extension is performed based on an RB set outside a channel occupancy time (COT) interval, based on at least one of the first RB set and the second RB set being outside the COT interval. [Claim 8] The method of claim 5, wherein the CP extension is a default CP extension based on a default CP extension being applied to at least one of the first RB set and the second RB set. [Claim 9] The method of claim 5 , wherein a guard band exists between the first set of RBs and the second set of RBs. [Claim 10] The method of claim 1 , wherein the maximum number of symbols used for the CP extension is 2 based on an SCS associated with the SL transmission being 30 KHz. [Claim 11] The method of claim 1 , wherein the maximum number of symbols used for the CP extension is 1 based on an SCS associated with the SL transmission being 15 KHz. [Claim 12] the first resource is a resource in a resource pool; Additional S-SSB resources are configured, and The method of claim 1 , wherein in the time interval of the additional S-SSB resource, S-SSB transmissions are not FDM'd with the SL transmissions. [Claim 13] The resource pool and the additional S-SSB resources overlap in the time domain; and The method of claim 12 , wherein the first resource is not included in a time interval where the resource pool and the additional S-SSB resource overlap. [Claim 14] a first device for wireless communication, At least one transmitter / receiver; at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory storing instructions that, when executed by the at least one processor, cause the first device to perform an operation; The operation is performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and A first apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on the subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 15] 1. An apparatus configured to control a first terminal, comprising: at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory storing instructions that, when executed by the at least one processor, cause the first terminal to perform an operation; The operation is performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and The apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 16] A non-transitory computer-readable storage medium having instructions recorded thereon, The instructions, when executed, cause the first device to: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and A non-transitory computer-readable storage medium, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 17] 1. A method for wireless communication by a second device, comprising: receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum; The SL transmission is performed based on a result of channel sensing for a channel access procedure (CAP) performed on the first resource being idle; A cyclic prefix (CP) extension is applied to the first resource; and The method, wherein the maximum number of symbols used for the CP extension is 2 based on the subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 18] 18. The method of claim 17, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to a first symbol of the first resource, a symbol one symbol before the first symbol, or a symbol two symbols before the first symbol. [Claim 19] a second device for wireless communication, At least one transmitter / receiver; at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory storing instructions that, when executed by the at least one processor, cause the second device to perform an operation; The operations include receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum; The SL transmission is performed based on a result of channel sensing for a channel access procedure (CAP) performed on the first resource being idle; A cyclic prefix (CP) extension is applied to the first resource; and A second apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on the subcarrier spacing (SCS) associated with the SL transmission being 60 kHz. [Claim 20] 20. The second apparatus of claim 19, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to a first symbol of the first resource, a symbol one symbol before the first symbol, or a symbol two symbols before the first symbol.

Claims

1. 1. A method for wireless communication in a first device, comprising: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and The method, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

2. 2. The method of claim 1, wherein the SL transmission comprises at least one of a sidelink synchronization signal block (S-SSB) transmission, a physical sidelink feedback channel (PSFCH) transmission, a physical sidelink control channel (PSCCH) transmission, or a physical sidelink shared channel (PSSCH) transmission.

3. 2. The method of claim 1, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

4. 2. The method of claim 1, wherein the CP extension is applied to a first symbol of the first resource, a symbol one symbol before the first symbol, or a symbol two symbols before the first symbol, based on whether the SL transmission is a PSCCH transmission or a PSSCH transmission.

5. The method of claim 1 , wherein the first resource is included in a first set of resource blocks (RBs) and a second set of RBs.

6. The method of claim 5 , wherein the CAP is a Type 1 CAP based on a Type 1 CAP being performed on at least one of the first set of RBs and the second set of RBs.

7. 6. The method of claim 5, wherein the CP extension is performed based on an RB set outside a channel occupancy time (COT) interval, based on at least one of the first RB set and the second RB set being outside the COT interval.

8. The method of claim 5 , wherein the CP extension is a default CP extension based on a default CP extension being applied to at least one of the first RB set and the second RB set.

9. The method of claim 5 , wherein a guard band exists between the first set of RBs and the second set of RBs.

10. 2. The method of claim 1, wherein the maximum number of symbols used for the CP extension is 2 based on an SCS associated with the SL transmission being 30 KHz.

11. 2. The method of claim 1, wherein the maximum number of symbols used for the CP extension is 1 based on an SCS associated with the SL transmission being 15 KHz.

12. the first resource is a resource in a resource pool; Additional S-SSB resources are configured, and The method of claim 1 , wherein during the time interval of the additional S-SSB resource, S-SSB transmissions are not frequency-multiplexed with the SL transmissions.

13. The resource pool and the additional S-SSB resources overlap in the time domain; and The method of claim 12 , wherein the first resource is not included in a time interval where the resource pool and the additional S-SSB resource overlap.

14. a first device for wireless communication, at least one transceiver; at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory storing instructions that, when executed by the at least one processor, cause the first device to perform an operation; The operation is performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and A first apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

15. 1. An apparatus configured to control a first terminal, comprising: at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory stores instructions that, when executed by the at least one processor, cause the first terminal to perform an operation; The operation is performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and The apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

16. A non-transitory computer-readable storage medium having instructions recorded thereon, The instructions, when executed, cause the first device to: performing channel sensing for a channel access procedure (CAP) on a first resource on a shared spectrum; and performing a sidelink (SL) transmission based on the channel sensing result being idle (IDLE) and the first resource; A cyclic prefix (CP) extension is applied to the first resource; and 10. The non-transitory computer-readable storage medium, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

17. 1. A method for wireless communication by a second device, comprising: receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum; The SL transmission is performed based on a result of channel sensing for a channel access procedure (CAP) performed on the first resource being idle; A cyclic prefix (CP) extension is applied to the first resource; and The method, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

18. 18. The method of claim 17, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to the first symbol of the first resource, the symbol one symbol before the first symbol, or the symbol two symbols before the first symbol.

19. a second device for wireless communication, at least one transceiver; at least one processor; and at least one memory executablely connected to said at least one processor; the at least one memory storing instructions that, when executed by the at least one processor, cause the second device to perform an operation; The operations include receiving a sidelink (SL) transmission from a first device based on a first resource on a shared spectrum; The SL transmission is performed based on a result of channel sensing for a channel access procedure (CAP) performed on the first resource being idle; A cyclic prefix (CP) extension is applied to the first resource; and A second apparatus, wherein the maximum number of symbols used for the CP extension is 2 based on a subcarrier spacing (SCS) associated with the SL transmission being 60 kHz.

20. 20. The second apparatus of claim 19, wherein, based on whether the SL transmission is an S-SSB transmission or a PSFCH transmission, the CP extension is applied to a first symbol of the first resource, a symbol one symbol before the first symbol, or a symbol two symbols before the first symbol.

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