Method and apparatus for implementing COT sharing in unlicensed spectrum

Abstract

A method for a first device to perform wireless communication and a device supporting the method are provided, which may include receiving first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH), acquiring a channel occupancy time (COT), selecting a second resource prior to the first resource based on a setting to share the COT for transmission on a first resource reserved by the resource assignment information, and transmitting information for sharing the COT on the second resource to the second device.

Description

[Technical Field]

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

[0002] Sidelink (SL) refers to 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 considered one solution to alleviate the burden on base stations due to the rapidly increasing data traffic. Vehicle-to-everything (V2X) refers to 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: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication can be provided via a PC5 interface and / or a 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] In one embodiment, a method for a first device to perform wireless communication is provided, which may include (comprise; configure; establish; configure; include; contain; have) the steps of receiving first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); acquiring a channel occupancy time (COT); selecting a second resource prior to the first resource based on a setting for sharing the COT for transmission on a first resource reserved by the resource assignment information; and transmitting information for sharing the COT on the second resource to the second device.

[0005] In one embodiment, a first device configured to perform wireless communication is provided, the first device including at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions, the instructions being executed by the at least one processor to cause the first device to: receive first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); acquire a channel occupancy time (COT); select a second resource prior to the first resource based on a configuration to share the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device.

[0006] In one embodiment, a processing device configured to control a first device is provided, the processing device including at least one processor and at least one memory coupled to the at least one processor and storing instructions, the instructions being executed by the at least one processor to cause the first device to: receive, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) from a second device, the first sidelink control information including resource assignment information; acquire a channel occupancy time (COT); select a second resource prior to the first resource based on a configuration to share the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device.

[0007] In one embodiment, a non-transitory computer-readable storage medium is provided having instructions recorded thereon that, when executed, can cause a first device to: receive first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); acquire a channel occupancy time (COT); select a second resource prior to the first resource based on a configuration for sharing the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device. [Brief explanation of the drawings]

[0008] [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 in 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 interlaced RB according to one embodiment of the present disclosure. [Figure 11] 1 illustrates an example of N transmission resources according to one embodiment of the present disclosure. [Figure 12] 1 illustrates an example of N transmission resources according to one embodiment of the present disclosure. [Figure 13] 1 illustrates an example in which transmission on a resource selected by a terminal blocks channel access by other terminals. [Figure 14] 1 illustrates an example in which a terminal prevents other terminals from blocking channel access through COT sharing, according to one embodiment of the present disclosure. [Figure 15] 1 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure. [Figure 16] 1 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure. [Figure 17] 1 illustrates a communication system 1 according to one embodiment of the present disclosure. [Figure 18] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a signal processing circuit for a transmit signal 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 mobile device according to one embodiment of the present disclosure. [Figure 22] 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] 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."

[0010] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Thus, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0011] 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."

[0012] 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."

[0013] 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."

[0014] In the following description, "when, if, in case of" may be replaced with "based on."

[0015] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] [Table 1]

[0021] 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.

[0022] 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.

[0023] 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:

[0024] - 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.

[0025] -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).

[0026] 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.

[0027] -Ubiquitous super 3D connectivity: Connecting drones and very low Earth orbit satellite networks to core network functions will create 6G ubiquitous super 3D connectivity.

[0028] Some common requirements for the characteristics of the new 6G network mentioned above are:

[0029] -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.

[0030] -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.

[0031] 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.

[0032] - 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.

[0033] 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.

[0034] The core implementation technologies of the 6G system are explained below.

[0035] 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.

[0036] 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.

[0037] -Large-scale MIMO technology

[0038] -Hologram beam forming (HBF)

[0039] -Optical wireless technology

[0040] -Free Space Optical Transmission Backhaul Network (FSO Backhaul Network)

[0041] -Non-Terrestrial Networks (NTN)

[0042] -Quantum Communication

[0043] -Cell-free Communication

[0044] -Integration of Wireless Information and Power Transmission

[0045] -Integration of Wireless Communication and Sensing

[0046] -Integrated Access and Backhaul Network

[0047] -Big data analysis

[0048] -Reconfigurable Intelligent Surface

[0049] -Metaverse

[0050] -Blockchain

[0051] 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.

[0052] -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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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 three lower 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 information transfer services using physical channels, 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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).

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 downlink multicast or broadcast services 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.

[0069] 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).

[0070] 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.

[0071] 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).

[0072] 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).

[0073] 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.

[0074] [Table 2]

[0075] 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, and thus 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 can be set to be different between the merged cells.

[0076] 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.

[0077] 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).

[0078] [Table 3]

[0079] 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).

[0080] [Table 4]

[0081] 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.

[0082] 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.

[0083] 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.

[0084] Below, we will explain about BWP (Bandwidth Part) and carrier.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] V2X or SL communication will be explained below.

[0092] 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.

[0093] 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).

[0094] 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.

[0095] 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.

[0096] For example, (a) of Figure 8 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Or, for example, (a) of Figure 8 illustrates terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to general SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] An example of SCI format 1-A will be described below.

[0104] SCI format 1-A is for PSSCH and 2 on PSSCH. nd Used for scheduling -stage SCI.

[0105] The following information is transmitted using SCI Format 1-A.

[0106] - Priority - 3 bits

[0107] - Frequency resource allocation - If the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, 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, the ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0108] - 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

[0109] -Resource reservation cycle -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

[0110] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns set by the upper layer parameter sl-PSSCH-DMRS-TimePatternList

[0111] -2 nd -stage SCI format - 2 bits as defined in Table 5

[0112] Beta_Offsets indicator - 2 bits as provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0113] Number of DMRS ports - 1 bit as defined in Table 6

[0114] -Modulation and coding method - 5 bits

[0115] Additional MCS table indicator - 1 bit if one MCS table is set by the upper layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the upper layer parameter sl-Additional-MCS-Table; 0 bit otherwise.

[0116] PSFCH overhead indicator - 1 bit if upper layer parameter sl-PSFCH-Period=2 or 4; 0 bit otherwise

[0117] Reserved Bits - The number of bits determined by the upper layer parameter sl-NumReservedBits, which is set to 0.

[0118] [Table 5]

[0119] [Table 6]

[0120] An example of SCI format 2-A will be described below.

[0121] 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 for decoding the PSSCH.

[0122] The following information is transmitted via SCI Format 2-A:

[0123] - HARQ process number - 4 bits

[0124] -New Data Indicator - 1 bit

[0125] -redundancy version - 2 bits

[0126] - Source ID - 8 bits

[0127] -Destination ID - 16 bits

[0128] HARQ feedback activation / deactivation indicator - 1 bit

[0129] Cast Type Indicator - 2 bits as defined in Table 7

[0130] -CSI Request - 1 bit

[0131] [Table 7]

[0132] An example of SCI format 2-B will be described below.

[0133] In HARQ operation, if the HARQ-ACK information includes only NACK or there is no feedback of HARQ-ACK information, SCI format 2-B is used for decoding the PSSCH.

[0134] The following information is transmitted via SCI Format 2-B:

[0135] - HARQ process number - 4 bits

[0136] -New Data Indicator - 1 bit

[0137] -redundancy version - 2 bits

[0138] - Source ID - 8 bits

[0139] -Destination ID - 16 bits

[0140] HARQ feedback activation / deactivation indicator - 1 bit

[0141] - Zone ID - 12 bits

[0142] - Communication Range Requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0143] 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.

[0144] 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.

[0145] FIG. 9 illustrates three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 9 illustrates broadcast-type SL communication, (b) of FIG. 9 illustrates unicast-type SL communication, and (c) of FIG. 9 illustrates 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 with SL multicast communication, SL one-to-many communication, etc.

[0146] The Hybrid Automatic Repeat Request (HARQ) procedure will now be described.

[0147] For example, SL HARQ feedback may be enabled for unicast. For example, SL HARQ feedback may be enabled for groupcast. For example, two HARQ feedback options may be supported for groupcast.

[0148] (1) Groupcast Option 1: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal can transmit a NACK (negative acknowledgment) to the transmitting terminal via a PSFCH. On the other hand, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal may not transmit an ACK (positive acknowledgment) to the transmitting terminal.

[0149] (2) Groupcast Option 2: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal can transmit a NACK to the transmitting terminal via a PSFCH. If the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal can transmit an ACK to the transmitting terminal via a PSFCH.

[0150] The UE procedure for reporting HARQ-ACK in the sidelink will now be described.

[0151] The UE uses N to transmit a PSFCH containing HARQ-ACK information in response to the PSSCH reception. PSSCH subch The scheduling of PSSCH reception on one or more subchannels from the subchannels may be indicated by the SCI format. The UE provides HARQ-ACK information including ACK or NACK, or only NACK.

[0152] The UE can be provided with the number of slots in the resource pool for PSFCH transmission occasion resources by sl-PSFCH-Period-r16. If the number is 0, PSFCH transmission from the UE is disabled in the resource pool. The UE can be provided with k mod N PSFCH PSSCH = 0, slot t′ k SL (0≦k <T′ max ) where t' k SL is a slot that belongs to the resource pool, and T′ max is the number of slots belonging to the resource pool within 10240 msec, and N PSFCH PSSCH is provided by sl-PSFCH-Period-r16. The UE can be instructed by higher layers not to transmit a PSFCH in response to PSSCH reception. If the UE receives a PSSCH in a resource pool and the HARQ feedback enabled / disabled indicator field included in the associated SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information via a PSFCH transmission in the resource pool. The UE transmits the PSFCH in the first slot, which is the slot after the minimum number of slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool including the PSFCH resource and after the last slot of PSSCH reception.

[0153] The UE determines a set M of PRBs in the resource pool for PSFCH transmission on PRBs of the resource pool. PSFCH PRB、set The number of subchannels for the resource pool provided by sl-NumSubchannel is N. subch and N PSFCH PSSCHFor a smaller or the same number of PSSCH slots associated with a PSFCH slot, the UE PRB、set PSFCH Among the PRBs, [(i+j·N PSFCH PSSCH )·M PSFCH subch、slot , (i+1+j·N PSFCH PSSCH )·M PSFCH subch、slot -1] PRB is allocated to slot i and subchannel j of the PSSCH slot linked to the PSFCH slot. PSFCH subch、slot =M PSFCH PRB、set / (N subch N PSFCH PSSCH ), 0≦i <N PSFCH PSSCH , 0≦j <N subch and the allocation starts with increasing i and continues with increasing j. PSFCH PRB、set N subch N PSFCH PSSCH We expect it to be a multiple of .

[0154] The UE determines the number of PSFCH resources available for multiplexing HARQ-ACK information included in the PSFCH transmission as R PSFCH PRB、CS =N PSFCH type M PSFCH subch、slot N PSFCH CS Here, N PSFCH CS is the number of cyclic shift pairs for the resource pool, and based on instructions from the upper hierarchy,

[0155] -N PSFCH type = 1 and M PSFCH subch、slot The PRB is associated with the starting subchannel of the corresponding PSSCH.

[0156] -N PSFCHtype =N PSSCH subch and N PSSCH subch M PSFCH subch、slot PRB is the N of the corresponding PSSCH. PSSCH subch Associated with one or more of the sub-channels.

[0157] The PSFCH resources are first PSFCH type M PSFCH subch、slot PRBs are indexed in ascending order of PRB index, and then N PSFCH CS The cyclic shift pairs are indexed in ascending order of their cyclic shift pair indexes.

[0158] The UE receives the index of the PSFCH resource for PSFCH transmission (P ID +M ID ) mod R PSFCH PRB、CS Here, P ID is the physical layer source ID provided by the SCI format 2-A or 2-B that schedules PSSCH reception, and M ID is the ID of the UE that receives the PSSCH indicated by the higher layer if the UE detects SCI format 2-A with the cast type indicator field value '01', otherwise, M ID is 0.

[0159] The UE uses Table 8 to determine N PSFCH CS and determine the m0 value for calculating the cyclic shift α value from the cyclic shift pair index corresponding to the PSFCH resource index.

[0160] [Table 8]

[0161] If the UE detects SCI format 2-A with a cast type indicator field value of '01' or '10', as shown in Table 9, or if the UE detects SCI format 2-B or SCI format 2-A with a cast type indicator field value of '11', as shown in Table 10, the UE shall use the value m for calculating the cyclic shift α value. cs The UE applies one cyclic shift of the cyclic shift pair to the sequence used for PSFCH transmission.

[0162] [Table 9]

[0163] [Table 10]

[0164] Alternatively, a UE may be assigned a set of non-contiguous RBs (equally spaced apart) in frequency. Such a set of non-contiguous RBs can be called interlaced RBs. This is useful in spectrum (e.g., shared spectrum) where constraints such as occupied channel bandwidth (OCB) and power spectral density (PSD) apply.

[0165] 10 illustrates an interlaced RB according to one embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0166] Referring to Figure 10, multiple interlaces of RBs are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M can represent the number of interlaced RBs given by Table 11.

[0167] [Table 11]

[0168] A communication device (e.g., a device proposed through various embodiments of the present disclosure, a UE, a vehicle, a drone, etc.) can transmit a signal / channel using one or more interlaced RBs.

[0169] On the other hand, in the next-generation system, a terminal can perform sidelink transmission and / or reception operations in an unlicensed band. Meanwhile, when operating in an unlicensed band, band-specific regulations or requirements may require a channel sensing operation (e.g., energy detection / measurement) on the channel to be used before the terminal performs transmission. Only when the channel sensing result determines that the channel or RB set to be used is idle (e.g., when the measured energy is below or equal to a specific threshold), the terminal can transmit in the unlicensed band. When the channel sensing result determines that the channel or RB set to be used is busy (e.g., when the measured energy is above or exceeds a specific threshold), the terminal can cancel all or part of the transmission in the unlicensed band. Meanwhile, when operating in an unlicensed band, the terminal can omit or simplify the channel sensing operation (make the channel sensing interval relatively small) within a certain time period after transmission in a specific time interval. Meanwhile, after a certain time period has elapsed after transmission, the terminal can determine whether to transmit after performing a normal channel sensing operation. On the other hand, in the case of transmission in an unlicensed band, depending on regulations or requirements, the time duration and / or frequency occupation area size and / or power spectral density (PSD) of a signal / channel transmitted by a terminal may be at or above a certain level. On the other hand, in an unlicensed band, in order to simplify channel sensing, the content that a channel secured through initial normal channel sensing is to be occupied for a certain time is notified through COT (channel occupancy time) interval information, and the maximum length of the COT interval can be set differently depending on the priority value or channel access priority class (CAPC) of a service or data packet.

[0170] On the other hand, the base station can share the COT interval it has secured through channel sensing via DCI transmission, and the terminal can perform a specific (instructed) channel sensing type and / or CP extension within the COT interval based on the DCI information received from the base station. On the other hand, the terminal can 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 the UL via configured grant-uplink control information (CG-UCI). In this situation, the base station can perform simplified channel sensing within the COT interval shared by the terminal. Meanwhile, in the case of sidelink communication, there are situations in which the terminal receives instructions on resources to be used for sidelink transmission from the base station via DCI or RRC signaling, such as Mode 1 resource allocation (RA) operation, and there are also situations in which the terminal performs sidelink transmission and reception via UE-to-UE sensing without the assistance of the base station, such as Mode 2 RA operation.

[0171] On the other hand, in the case of channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, DL transmission is performed according to the procedures shown in Tables 12 and 13.

[0172] [Table 12]

[0173] [Table 13]

[0174] On the other hand, in the case of channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, UL transmission is performed according to the procedures shown in Tables 14 and 15.

[0175] [Table 14]

[0176] [Table 15]

[0177] Meanwhile, the simplified channel access type 2 is used before transmission within the channel occupancy time (COT), and DL transmission is performed according to the procedure shown in Table 16.

[0178] [Table 16]

[0179] Meanwhile, simplified channel access type 2 is used within the channel occupancy time (COT) before transmission, and UL transmission is performed according to the procedure shown in Table 17.

[0180] [Table 17]

[0181] In an embodiment of the present disclosure, TYPE 2 ASL channel access can be a method similar to TYPE 2 ADL and / or UL channel access. For example, TYPE 2 ASL channel access is performed in a sensing interval of T_short_sl=25 us, which consists of a duration of T_f=16 us followed by one sensing slot, where T_f can include the sensing slot at its beginning. The basic IDLE determination in TYPE 2 ASL channel access can also borrow the IDLE determination in DL or UL channel access.

[0182] In an embodiment of the present disclosure, TYPE 2 BSL channel access can be a method similar to TYPE 2 BDL and / or UL channel access. For example, in the case of TYPE 2 BSL channel access, a terminal can perform transmission immediately after sensing a channel in an idle state within a duration of T_f=16 us. T_f can include sensing slots occurring within the last 9 us of T_f. In TYPE 2 BSL channel access, the basic IDLE determination can also borrow from the IDLE determination in DL or UL channel access.

[0183] In an embodiment of the present disclosure, TYPE 2 CSL channel access may be a method similar to TYPE 2 CDL and / or UL channel access. For example, in the case of TYPE 2 CSL channel access, the terminal does not perform channel sensing. Instead, the time interval for SL transmission may be up to 584 us.

[0184] In an embodiment of the present disclosure, TYPE 1 SL channel access may be a method similar to TYPE 1 DL and / or UL channel access. For example, the UE may randomly derive an integer value N based on a contention window size corresponding to a priority class. If the channel sensing result for a T_d-sized defer duration corresponding to the priority class is idle, the UE may decrement the N-1 counter value in units of T_sl if idle. If the counter value is 0, the UE may occupy the RB set or channel targeted for channel sensing. If a portion of the channel sensing result for the T_sl duration is determined to be busy, the UE may maintain the counter value as it is until the channel sensing result for the T_d-sized defer duration is again idle, and the UE may continue to perform channel sensing. In the above, the defer duration of T_d length is composed of m_p consecutive T_sl periods after T_f=16us, where m_p is a value determined by the priority class (p), and T_sl=9us may be the time period during which channel sensing is performed.

[0185] CAPC (Channel Access Priority Class) will be explained below.

[0186] MACCE and CAPC of radio bearers can be fixed or configurable to operate in FR1:

[0187] - Padding BSR (Buffer Status Report) and recommended bit rate MACCE are fixed to the lowest priority;

[0188] -Fixed to highest priority for SRB0, SRB1, SRB3 and 6MACCE;

[0189] Configured by the base station for SRB2 and DRB.

[0190] When selecting a CAPC for a DRB, the base station takes into account the 5QI of all QoS flows multiplexed into the DRB, while also considering fairness between other traffic types and transmissions. Table 18 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC to be used for a given QoS flow. For standardized 5QI, CAPC is defined as shown in the table below, and for non-standardized 5QI, the CAPC with the most suitable QoS characteristics should be used.

[0191] [Table 18]

[0192] Table 19 shows the m by channel connection priority class in DL. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different examples.

[0193] [Table 19]

[0194] Refer to Table 19 to define 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.

[0195] Table 20 shows the channel access priority classes in the UL.p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different examples.

[0196] [Table 20]

[0197] Refer to Table 20 to define 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.

[0198] In an embodiment of the present disclosure, when a terminal occupies a channel through TYPE 1 SL channel access, the terminal may not be ready to transmit a sidelink transmission. In this case, the terminal may configure a defer duration of T_d length and a sensing interval of T_sl length immediately before the sidelink transmission it is ready to transmit. If both are busy, the terminal may immediately perform the sidelink transmission. If either one is busy, the terminal may perform TYPE 1 SL channel access again. For example, if sidelink transmission is difficult when channel sensing ends (e.g., if channel sensing ends after the start of sidelink transmission), the terminal may reselect the sidelink transmission resource. For example, the reselected resource may be selected taking into account the end time of channel sensing and / or the length of the remaining sensing interval. For example, the remaining sensing interval may be a value derived assuming that all channel sensing is busy.

[0199] The following describes the UE procedure for determining a subset of resources to be reported to higher layers in PSSCH resource selection in sidelink resource allocation mode 2.

[0200] In resource allocation mode 2, higher layers may request the UE to determine a subset of resources from which the higher layers select resources for PSSCH / PSCCH transmission. To trigger this procedure, in slot n, the higher layers provide the following parameters for the PSSCH / PSCCH transmission:

[0201] -The resource pool to which the resource is reported;

[0202] -L1 priority, prio TX ;

[0203] - remaining PDB (packet delay budget);

[0204] - the number L of subchannels used for PSSCH / PSCCH transmission within a slot subCH ;

[0205] Optionally, the resource reservation interval P in msec rsvpTX

[0206] If the higher layer requests the UE to determine a subset of resources to select for PSSCH / PSCCH transmission as part of a re-evaluation or pre-emption procedure, the higher layer provides the resource set (r0, r1, r2, ...) that can be re-evaluated and the resource set (r'0, r'1, r'2, ...) that can be pre-empted.

[0207] -Slot r i Before or after T3, it is up to the UE implementation to determine the subset of resources requested by higher layers, where r i'' is the slot with the smallest slot index among (r0, r1, r2, ...) and (r'0, r'1, r'2, ...), and T3 is T SL proc,1 Here, T SL proc,1 is defined as the number of slots determined based on the SCS configuration of the SL BWP, where μ SL This is the SCS configuration for SL BWP.

[0208] The following higher layer parameters affect this procedure:

[0209] -sl-SelectionWindowList:Internal parameter T 2min is a given prior TX For each value, the corresponding value from the upper layer parameter sl-SelectionWindowList is set.

[0210] -sl-Thres-RSRP-List: This upper layer parameter is i , p j ) provides the RSRP threshold for the combination, where p i is the priority field value contained in the received SCI format 1-A, and p j is the priority of transmission on the resource selected by the UE; in this procedure, p j =prio TX is.

[0211] -sl-RS-ForSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurements.

[0212] -sl-ResourceReservePeriodList

[0213] -sl-SensingWindow: The internal parameter T0 is defined as the number of slots corresponding to sl-SensingWindow msec.

[0214] -sl-TxPercentageList: given prio TX The internal parameter X for the sl-TxPercentageList(prio TX )

[0215] -sl-PreemptionEnable: If sl-PreemptionEnable is provided and is not equal to "enabled", the internal parameter prio pre is set to the parameter sl-PreemptionEnable provided by higher layers.

[0216] If the resource reservation interval P rsvp_TX is provided, the resource reservation interval is the logical slot unit P′ in msec. rsvp_TX Convert to.

[0217] Notation:

[0218] (t′ SL 0,t′ SL 1,t′ SL 2,...) denotes the set of slots that belong to the sidelink resource pool.

[0219] For example, the UE may select a set of candidate resources (S A For example, when resource (re)selection is triggered, the UE may select a set of candidate resources (S A For example, when re-evaluation or pre-emption is triggered, the UE may select a set of candidate resources (S A ) can be selected.

[0220] [Table 21]

[0221] On the other hand, as part of reducing the overhead due to channel access operations, the transmitting node may perform consecutive transmissions such that the gap between transmissions is below a certain level, and the transmitting node may omit channel sensing operations in between transmissions for the same transmission burst (the consecutive transmissions).

[0222] 11 illustrates an example of N transmission resources according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0223] Referring to FIG. 11, as part of reducing overhead due to channel access operations, a transmitting node may perform consecutive transmissions using N transmission resources, and the transmitting node may omit channel sensing operations between transmissions for the same transmission burst (the consecutive transmissions).

[0224] 12 illustrates an example of N transmission resources according to one embodiment of the present disclosure. The embodiment of FIG. 12 can be combined with various embodiments of the present disclosure.

[0225] Referring to FIG. 12, as part of reducing overhead due to channel access operations, a transmitting node can perform consecutive transmissions using N transmission resources so that the gap between transmissions is below a certain level, and the transmitting node can omit channel sensing operations between transmissions for the same transmission burst (the consecutive transmissions).

[0226] On the other hand, when a terminal transmits in a section where a channel access procedure by another terminal is being performed, the channel access procedure by the other terminal may fail due to the transmission. For example, resources selected / reserved for the terminal's transmission may block channel access by other terminals, which may lead to problems such as inefficient use of resources in unlicensed bands and communication delays in unlicensed bands.

[0227] 13 illustrates an example in which transmission on resources selected by a terminal blocks channel access by other terminals. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0228] Referring to FIG. 13, another terminal may reserve resource B, and the terminal may know through sensing (e.g., SCI monitoring) that resource B has been reserved by the other terminal. In this case, the terminal may select a transmission resource from among the remaining candidate resources excluding resource B. In the embodiment of FIG. 13, it is assumed that the terminal selects / reserves resource A and transmits on resource A. In this case, channel access performed by the other terminal may fail for transmission on resource A, and the other terminal may not be able to transmit on resource B due to the channel access failure. In particular, in the case of channel access type 1, the time required for channel access is relatively long, so the above-mentioned problem may occur frequently.

[0229] Various embodiments of the present disclosure provide methods for performing COT sharing and devices that support the same.

[0230] For example, when a terminal reserves resources for the same TB, it may restrict the selected resources for the PSSCH to be within one or more consecutive (sidelink) slots and / or the same RB set(s).

[0231] For example, when the terminal performs a single resource (re)selection process for periodic resource reservation, it may restrict the selected resources for the PSSCH to be in one or more consecutive (sidelink) slots and / or the same RB set(s).

[0232] Meanwhile, a candidate single-slot resource, which is a basic unit of available resources and selected resources in a resource (re)selection process, may represent the lowest subchannel and single slot in the frequency domain for PSSCH transmission resources consisting of one or more subchannels. For example, when a terminal performs a resource (re)selection process, it may use a candidate multi-slot resource, which is expanded to a plurality of N slots, as a basic unit of available resources and / or selected resources. The candidate multi-slot resource may represent the lowest subchannel in the frequency domain for PSSCH transmission resources consisting of one or more subchannels and a specific slot group consisting of the N slots. For example, when a terminal performs a resource (re)selection process, a plurality of slots constituting a resource selection window may be partitioned into the N slots and / or divided into slot groups consisting of up to N slots. For example, a group consisting of N slots is formed from the start of the resource selection window. For example, a group consisting of N slots is formed from the first sidelink slot belonging to a resource pool within SFN 0, DFN 0, or a 10240 msec period. For example, the candidate multi-slot resource may represent each slot group. For example, the value of N may vary and / or be (pre)configured for each resource pool and / or for each transmission SL priority value for PSSCH transmission and / or for each CAPC value for PSSCH transmission and / or for each CAPC table for PSSCH transmission and / or for each congestion control level and / or for each QoS parameter and / or for each (remaining) packet delay budget (PDB) for PSSCH transmission and / or for each (remaining) length of the COT interval.

[0233] For example, when performing a resource (re)selection process in units of candidate multi-slot resources, if a PSSCH transmission group resource corresponding to the candidate multi-slot resource overlaps with a reserved resource of another terminal and / or if the RSRP measurement value for the reserved resource exceeds or is equal to or greater than an RSRP threshold, the terminal may exclude the candidate multi-slot resource from the available resource set. For example, if the ratio of exceptional overlap with other reserved resources on the time axis and / or frequency axis is below a certain level and / or if the average RSRP measurement value for the PSSCH transmission resource group corresponding to the candidate multi-slot resource is below a certain level, the terminal may include the candidate multi-slot resource in the available resource set. For example, when performing a resource (re)selection process in units of candidate multi-slot resources, if a PSSCH transmission group resource corresponding to the candidate multi-slot resource overlaps with an excluded resource derived from a non-monitored slot of the terminal, the terminal may exclude the candidate multi-slot resource from the available resource set. For example, when a terminal performs a resource (re)selection process in units of candidate multi-slot resources, it can limit the size of the resource selection window and / or the minimum and / or maximum values ​​for the resource selection window size (T_2,min) to be multiples of N.

[0234] For example, when sidelink resources are allocated in units of candidate multi-slot resources in the Mode 1 resource selection process, the slot offset indicating the time position of the first sidelink resource can be extended to an offset indicating the number of slot groups.

[0235] For example, when the basic unit for the PSSCH transmission resource is a candidate multi-slot resource, the (maximum) number of transmissions for a single TB may be extended to the number of PSSCH transmission groups. For example, if some of the PSSCH transmission groups are dropped in the above, the PSSCH transmission groups may not be included in the number of transmissions for a single TB. For example, if some of the PSSCH transmission groups are dropped and / or if a single PSSCH transmission group is divided into multiple PSSCH transmission groups in the above, each PSSCH transmission subgroup may be included in the number of transmissions for a single TB. For example, when the basic unit for the PSSCH transmission resource is a candidate multi-slot resource, the maximum number of transmissions for a single TB may be less than or equal to 32 multiplied by N. For example, when the basic unit for the PSSCH transmission resource is a candidate multi-slot resource, the maximum number of transmissions for a single TB may be N multiplied by the (pre-)set maximum number of transmissions based on the candidate multi-slot resource. For example, if the UE is unable to perform PSCCH / PSSCH transmission due to an LBT failure, the dropped PSSCH transmission may not be included in the number of transmissions for a single TB. The reason for this is to ensure TB performance since transmission for the actual TB could not be performed. For example, if the UE is unable to perform PSCCH / PSSCH transmission due to an LBT failure, the dropped PSSCH transmission may be included in the number of transmissions for a single TB. The advantage of this is that it can reduce power consumption due to frequent transmission attempts for the same TB even if the UE misses a transmission opportunity due to an LBT. For example, when the UE performs the resource (re)selection process on a per-candidate multi-slot resource basis, it may determine whether to perform RSRP threshold boosting and the available resource set to report to a higher layer based on the ratio of the number of candidate multi-slot resources in the available resource set to the number of all candidate multi-slot resources belonging to the resource selection window.For example, when the terminal performs the resource (re)selection process on a per candidate multi-slot resource basis, the terminal may still check the amount of available resources on a per candidate single-slot resource basis.

[0236] For example, a candidate single-slot resource, which is the basic unit for available resources and selected resources in the resource (re)selection process, may be composed of a single or multiple subchannels and may represent the lowest frequency subchannel and the first or last slot in a PSSCH transmission group for PSSCH transmission group resources transmitted over a single or multiple consecutive slots (e.g., the N slots). For example, if a PSSCH transmission group resource corresponding to a candidate single-slot resource overlaps with a reserved resource of another terminal and / or if the RSRP measurement value for the reserved resource exceeds or is equal to or greater than an RSRP threshold, the terminal may exclude the candidate single-slot resource from the available resource set. For example, when performing the resource (re)selection process in units of candidate single-slot resources, if a PSSCH transmission group resource corresponding to a candidate single-slot resource overlaps with an excluded resource derived from a non-monitored slot of the terminal, the terminal may exclude the candidate single-slot resource from the available resource set. For example, if the ratio of overlap with other reserved resources on the time axis and / or frequency axis is below a certain level and / or the average RSRP measurement value for the PSSCH transmission resource group corresponding to the candidate single-slot resource is below a certain level, the terminal can include the candidate single-slot resource in the available resource set.

[0237] In embodiments of the present disclosure, different PSSCH transmission group candidates may overlap with each other in time and / or frequency. In embodiments of the present disclosure, different PSSCH transmission group candidates may not be allowed to overlap with each other in time.

[0238] For example, the terminal may perform resource (re)selection on a candidate single-slot resource basis. In this case, the terminal may determine whether the candidate single-slot resources in the available resource set are present in at least the N consecutive slots over time and / or whether the consecutive candidate single-slot resources are present in the same RB set(s) over time at a certain level or above. For example, the certain level may be (pre)set for each N value and / or each resource pool and / or each SL transmission priority value and / or each CAPC table and / or CAPC value for PSCCH / PSSCH transmission. For example, the condition may be whether the ratio of the number of candidate single-slot resource groups satisfying the condition to the total number of candidate single-slot resources within the resource selection window is equal to or above a (pre)set threshold for each group size and / or each N value and / or each resource pool. For example, available resources for consecutive slots may be limited to those that actually exist in consecutive physical slots in the physical slot domain. For example, the terminal may boost the RSRP threshold to obtain an available resource set in which available resources for consecutive slots exist at a certain level or above. For example, the RSRP threshold may be managed / determined differently for each group size and / or for each value of N. For example, the initial value of the RSRP threshold may be (pre-) set for each group size and / or for each value of N.

[0239] In an embodiment of the present disclosure, for resources for N consecutive slots corresponding to available resources, multiple values ​​of N are permitted for PSCCH / PSSCH transmission. For example, PSSCH resource sets derived using different values ​​of N may have a mutually surrounding structure. More specifically, time axis boundaries between PSSCH resource sets using different values ​​of N may be aligned as much as possible. For example, for candidate values ​​for N, a terminal may perform a resource selection process based on an initial N_init value when determining the value of N for PSCCH / PSSCH transmission, and may abort the N_init value-based resource selection process in a specific situation and then perform a resource selection process based on a smaller or larger value of N. For example, the specific situation may be when the RSRP threshold boosting count is equal to or greater than a certain level (e.g., a value (pre-set) for each resource pool and / or each N value) and / or when the RSRP threshold is equal to or greater than a certain level (e.g., a value (pre-set) for each resource pool and / or each N value).

[0240] For example, for a PSCCH / PSSCH transmission resource group mapped to N consecutive slots, a UE can perform actual transmissions only in K (e.g., K is smaller than and / or equal to N) PSCCH / PSSCH transmission resource groups after successfully accessing the PSCCH / PSSCH transmission group. For example, the value of K may vary per SL priority, per resource pool, per CAPC value, per HARQ-ACK state for the PSCCH / PSSCH, per QoS parameter, and / or per congestion control level. For example, the value of K may be (pre)set per SL priority, per resource pool, per CAPC value, per HARQ-ACK state for the PSCCH / PSSCH, per QoS parameter, and / or per congestion control level. For example, the value of K may be determined as the number of PSCCH / PSSCH transmission resources from the time the UE successfully accesses the channel to the time the UE receives HARQ-ACK for the PSCCH / PSSCH transmitted by the UE. The value of K may be determined as the number of PSCCH / PSSCH transmission resources from when the terminal has successfully accessed the channel until when the terminal receives or determines an ACK for the PSCCH / PSSCH transmitted by the terminal.

[0241] In an embodiment of the present disclosure, when a terminal selects selection resources for PSCCH / PSSCH transmission, if there is a constraint that the time gap between different selection resources must be equal to or greater than a certain level (e.g., HARQ RTT (round trip time)), the constraint on the time gap can be extended to include a constraint on the time gap between the last point in time for a PSSCH transmission resource group and the start point in time for the next PSSCH transmission resource group.

[0242] In an embodiment of the present disclosure, time-frequency resources corresponding to candidate multi-slot resources or candidate single-slot resources may actually exist in consecutive physical slots in the physical resource domain. For example, depending on the configuration of logical slots configured in a resource pool, single or multiple slot gaps may exist between different candidate multi-slot resources or different candidate single-slot resources. For example, depending on the configuration of logical slots configured in a resource pool, the number of constituent slots or group size may differ for different candidate multi-slot resources or different candidate single-slot resources. For example, a terminal may generate multiple slot groups for a physical slot according to the value N, and for each slot group, the terminal may derive (to be the same) resources (in the time domain) corresponding to candidate multi-slot resources or candidate single-slot resources by limiting the logical slots belonging to the resource pool.

[0243] In the embodiments of the present disclosure, the available resource set S_A consisting of candidate single-slot resources or candidate multi-slot resources has been described as corresponding to the same TB or the same grant (periodic resource reservation). However, the available resource set S_A can be extended to cover multiple TBs or multiple grants (multiple periodic reservations and / or aperiodic reservations). On the other hand, when the available resource set S_A corresponds to multiple TBs or grants, the transmission priority value, remaining PDB value, resource selection window size, resource selection window position, sensing window position or size, number of subchannels corresponding to candidate resources, transmission resource reservation period, and / or CAPC value may differ for each of the multiple TBs or grants. In such cases, it is necessary to determine which resource set corresponds to which candidate single-slot resource and / or candidate multi-slot resource based on which parameters in the resource selection procedure. For example, when an available resource set S_A is generated for multiple TBs or grants, a representative value among the parameters for the multiple TBs or grants may be selected based on the transmission priority value and / or the remaining PDB value and / or the resource selection window size and / or the resource selection window position and / or the position or size of the sensing window and / or the number of subchannels corresponding to the candidate resources and / or the transmission resource reservation period that configure or are used to configure S_A. For example, the parameter set corresponding to the S_A may correspond to a specific TB or grant. For example, the specific TB or grant corresponding to the parameter set for S_A may be determined based on the transmission priority value and / or the remaining PDB value and / or the resource selection window size and / or the resource selection window position and / or the position or size of the sensing window and / or the number of subchannels corresponding to the candidate resources and / or the transmission resource reservation period and / or the CAPC value and / or the time when the TB or grant is available or generated.For example, a specific TB or grant corresponding to the parameter set for S_A may have the lowest transmission priority value. For example, a specific TB or grant corresponding to the parameter set for S_A may have the highest transmission priority value. For example, a specific TB or grant corresponding to the parameter set for S_A may have the highest CAPC value. For example, a specific TB or grant corresponding to the parameter set for S_A may have the lowest CAPC value. For example, a specific TB or grant corresponding to the parameter set for S_A may have the same CAPC value as the CAPC value for SL burst transmission. For example, a specific TB or grant corresponding to the parameter set for S_A may have the earliest generation time. For example, a specific TB or grant corresponding to the parameter set for S_A may have the latest generation time.

[0244] For example, when an available resource set S_A is generated for multiple TBs or grants, the representative transmission priority value used to configure or configure S_A may be selected as the maximum value among the transmission priority values ​​for the multiple TBs or grants. In this case, when a PSCCH / PSSCH resource selection is performed from S_A in an upper layer of the terminal, a situation in which a low-priority PSCCH / PSSCH causes high interference to a high-priority PSCCH / PSSCH of another terminal, regardless of transmission priority, can be minimized. For example, when an available resource set S_A is generated for multiple TBs or grants, the representative transmission priority value used to configure or configure S_A may be selected as the minimum value among the transmission priority values ​​for the multiple TBs or grants. In this case, it is advantageous to secure available resources with a low interference level for a high-priority PSCCH / PSSCH or to secure a large amount of available resources.

[0245] For example, when an available resource set S_A is generated for multiple TBs or grants, the representative remaining PDB value used to configure or to configure S_A may be selected to be the smallest remaining PDB value among the remaining PDB values ​​for the multiple TBs or grants. For example, when an available resource set S_A is generated for multiple TBs or grants, the resource selection window size and / or resource selection window position used to configure or to configure S_A may be set based on the start of the latest resource selection window and / or the end of the earliest resource selection window among the resource selection windows for the multiple TBs or grants. In this case, a separate procedure may not be required when selecting selection resources at the upper end of the terminal because the selection window is aligned based on tight transmission requirements. For example, when an available resource set S_A is generated for multiple TBs or grants, the representative remaining PDB value used to configure or to configure S_A may be selected to be the largest remaining PDB value among the remaining PDB values ​​for the multiple TBs or grants. For example, when generating an available resource set S_A for multiple TBs or grants, the resource selection window size and / or resource selection window position used to configure S_A may be set based on the start of the earliest resource selection window and / or the end of the latest resource selection window among the resource selection windows for the multiple TBs or grants. This may be advantageous in that it can ensure a sufficient amount of available resources for various data or TBs and / or ensure resources with a low interference level as candidate resources. For example, in this case, when selecting PSCCH / PSSCH resources for multiple TBs or grants from S_A, the terminal may select suitable resources based on the remaining PDB and / or resource selection window for each TB or grant. For example, even if S_A is determined based on a relatively large remaining PDB, the terminal may select resources within the remaining PDB for the PSCCH / PSSCH when actually selecting PSCCH / PSSCH resources.

[0246] For example, when an available resource set S_A is generated for multiple TBs or grants, the number of representative subchannels corresponding to candidate resources constituting or used to constitute S_A may be selected as the maximum number of subchannels for the multiple TBs or grants. In this case, if the number of actual transmission subchannels is small, using S_A does not pose a problem in terms of interference level. For example, when an available resource set S_A is generated for multiple TBs or grants, the number of representative subchannels corresponding to candidate resources constituting or used to constitute S_A may be selected as the minimum number of subchannels for the multiple TBs or grants or 1. In this case, there is an advantage that a larger amount of available resources can be secured when the number of actual transmission subchannels is small. For example, in this case, when a terminal selects PSCCH / PSSCH resources for multiple TBs or grants from S_A, the terminal may select suitable resources based on the number of transmission subchannels for each TB or grant. For example, in the above, if the number of representative transmission subchannels for S_A is M and the number of transmission subchannels for actual PSCCH / PSSCH transmission is N (>M), and if there are N-M+1 consecutive candidate resources on the frequency side in S_A, the resource with the lowest frequency side among the N-M+1 candidate resources can be considered as the actual valid candidate resource.

[0247] For example, when an available resource set S_A is generated for multiple TBs or grants, the sensing window size and / or sensing window position used to configure or configure S_A can be set based on the start of the earliest sensing window and / or the end of the latest sensing window among the sensing windows for the multiple TBs or grants. For example, when an available resource set S_A is generated for multiple TBs or grants, the potential available slots used to configure or configure S_A can be the sum of the potential available slots for the multiple TBs or grants. The rationale for this is to maximize the amount of available resources. For example, when an available resource set S_A is generated for multiple TBs or grants, the potential available slots used to configure or configure S_A can be the intersection of the potential available slots for the multiple TBs or grants. The benefit of this is to minimize power consumption during sensing operations.

[0248] For example, when an available resource set S_A is generated for multiple TBs or grants, the transmission resource reservation period used to configure or configure S_A may be set to the minimum value among the transmission resource reservation periods for the multiple TBs or grants. For example, the minimum value among the resource reservation period values ​​may be the minimum value equal to or greater than a specific value (e.g., 100 ms). In this case, resource exclusion may be performed more tightly. Therefore, even if the actual transmission resource reservation period value is large, there may be fewer problems with resource collisions and interference levels by using the available resource set as is. For example, when an available resource set S_A is generated for multiple TBs or grants, the transmission resource reservation period used to configure or configure S_A may be set to the maximum value among the transmission resource reservation periods for the multiple TBs or grants. The rationale for this is to maximize the amount of available resources.

[0249] For example, multiple TBs or grants corresponding to the same S_A may be determined based on the transmission priority value and / or the remaining PDB value and / or the resource selection window size and / or the resource selection window position and / or the sensing window position or size and / or the number of subchannels corresponding to the candidate resources and / or the transmission resource reservation period and / or the CAPC value. For example, multiple TBs or grants corresponding to the same S_A may have the same transmission priority value and / or be within a (pre-defined) set or defined priority value range. For example, multiple TBs or grants corresponding to the same S_A may have the same CAPC value and / or be within a (pre-defined) set or defined CAPC value range or have a CAPC value equal to or less than a representative CAPC value. For example, multiple TBs or grants corresponding to the same S_A may have the same transmission resource reservation period and / or the transmission resource reservation period for multiple TBs or grants may be a multiple of the transmission resource reservation period for a specific TB or grant.

[0250] For example, when an available resource set S_A is generated for multiple TBs or grants, the transmission priority value and / or the remaining PDB value and / or the resource selection window size and / or the resource selection window position and / or the sensing window position or size and / or the number of subchannels corresponding to the candidate resources and / or the transmission resource reservation period may be (pre)configured to configure or be used for configuring S_A. For example, whether or not to use the (pre)configured values ​​may be selected or (pre)configured in the implementation of the terminal.

[0251] In an embodiment of the present disclosure, whether the terminal configures the available resource set S_A with candidate multi-slot resources and / or candidate single-slot resources (contiguous and / or discontinuous) may differ depending on whether it is inside or outside the COT interval. For example, the terminal may report the available resource set S_A based on candidate multi-slot resources and / or the available resource set S_A based on contiguous candidate single-slot resources and / or the available resource set S_A based on contiguous or discontinuous candidate single-slot resources to a higher layer. For example, the higher layer may mix the available resource sets for PSCCH / PSSCH resource selection depending on the maximum COT interval. For example, when a terminal starts an SL burst transmission through a Type 1 channel access procedure, a candidate multi-slot resource-based available resource set S_A and / or a contiguous candidate single-slot resource-based available resource set S_A may be generated and reported to a higher layer for candidate resources up to a maximum COT interval corresponding to a representative CAPC value for the SL burst transmission, and a contiguous or discontinuous candidate single-slot resource-based available resource set S_A may be generated and reported to a higher layer for candidate resources after the maximum COT interval. For example, when a terminal starts an SL burst transmission within a shared COT interval, a candidate multi-slot resource-based available resource set S_A and / or a contiguous candidate single-slot resource-based available resource set S_A may be generated and reported to a higher layer for candidate resources up to a maximum COT interval corresponding to a representative CAPC value for the shared COT or up to the end of the shared COT, and a contiguous or discontinuous candidate single-slot resource-based available resource set S_A may be generated and reported to a higher layer for candidate resources after the maximum COT interval. For example, when a terminal (re)selects resources for SL burst transmission, it can be assumed that the terminal performs channel sensing based on the Type 1 channel access procedure for SL burst transmission.For example, when a terminal (re)selects resources for SL burst transmission, the assumption for the maximum COT interval for the SL burst transmission may be the maximum, minimum, or average value of the representative CAPC value for the SL burst transmission and / or the maximum COT interval value corresponding to a value less than or equal to the representative CAPC value. For example, the type of candidate resource to be reported / used for each time interval may be determined based on the length of the representative maximum COT interval.

[0252] In the embodiment of the present disclosure, S_A is described as being separate depending on the basic unit of available resources, but different basic units of available resources may be permitted within a single S_A. For example, in the above case, the process of determining the amount of available resources may be performed for each basic unit of available resources.

[0253] For example, the terminal may not select candidate multi-slot resources and / or consecutive candidate single-slot resources in the available resource set S_A that are outside the COT interval as PSCCH / PSSCH resources, and / or may perform resource (re)selection or resource dropping if selected as PSCCH / PSSCH resources.

[0254] On the other hand, when time and / or frequency resources between multiple S_As overlap, the amount of candidate resources for each TB or SL grant may be insufficient when the UE selects PSCCH / PSSCH resources for multiple TB or SL grants. For example, the UE may derive a threshold for the amount of available candidate resources for each S_A by multiplying a (pre-)set ratio value by the amount of candidate resources within the resource selection window for S_A or the amount of remaining candidate resources excluding candidate resources that overlap (fully or partially) in time and / or frequency with available candidate resources belonging to other S_As (previously determined or specific S_As selected by an SL priority value or CAPC value). For example, the method for deriving the threshold for the amount of S_A may be applied differently when determining an S_A, depending on the presence or absence of a previously determined S_A and / or the priority value and / or CAPC value corresponding to the S_A. For example, when a terminal performs resource selection by simultaneously considering multiple S_As, the ratio value used to derive a threshold for the S_A amount can be set differently or separately (pre-set) from the ratio value for when resource selection is performed based on a single S_A.

[0255] For example, when S_A corresponds to multiple TBs or multiple SL grants, the threshold for the amount of S_A can be derived as a (pre)set ratio value and / or the product of the total number of candidate resources in the resource selection window and / or the amount of TB or SL grant corresponding to S_A. For example, the ratio value can be (pre)set differently or separately from when S_A corresponds to a single TB or SL grant. For example, the amount of TB or SL grant corresponding to S_A can be a value selected by the terminal and / or a (pre)set value.

[0256] On the other hand, after the UE generates and reports one or more available resource sets S_A to a higher layer, when the UE (re)selects resources for multiple TBs or grants from one or more available resource sets S_A(s), the UE needs to determine the procedure for selecting PSCCH / PSSCH resources. For example, the UE can (re)select PSCCH / PSSCH resources in units of TBs or grants from one or more available resource sets S_A. For example, the TB or grant procedure for PSCCH / PSSCH resource (re)selection can be performed in ascending order from a lower transmission priority value. For example, the TB or grant procedure for PSCCH / PSSCH resource (re)selection can be performed in descending order from a higher transmission priority value. For example, the TB or grant procedure for PSCCH / PSSCH resource (re)selection can be performed in ascending order from a lower remaining PDB value. This method allows the UE to preferentially use earlier resources for PSCCH / PSSCH transmission with a smaller remaining PDB. For example, in the above, the TB or grant procedure for PSCCH / PSSCH resource (re)selection may be performed in descending order starting from the largest remaining PDB value. For example, in the above, the TB or grant procedure for PSCCH / PSSCH resource (re)selection may be performed in order starting from the earliest arrival time and / or available time point and / or resource (re)selection trigger time. For example, in the above, the TB or grant procedure for PSCCH / PSSCH resource (re)selection may be performed in reverse order starting from the latest arrival time and / or available time point and / or resource (re)selection trigger time. For example, in the above, when PSCCH / PSSCH resources are (re)selected, the amount of minimum guaranteed resources for the subsequent TB or grant may be (pre)set, and / or PSCCH / PSSCH transmission resource selection for the preceding TB or grant may be performed to guarantee the amount of minimum guaranteed resources.

[0257] For example, the number of (consecutive) slots corresponding to a candidate multi-slot resource or candidate resource and / or the (initial or maximum) value for the number of slots of consecutive candidate single-slot resources and / or the candidate value for the value may be determined based on the implementation of the terminal and / or the length of the (maximum or remaining) COT interval according to the representative CAPC value for the SL transmission burst and / or the representative CAPC value for the SL transmission burst and / or the representative SL priority value for the SL transmission burst and / or the (maximum) number of transmissions for each grant and / or the number of grants available to the terminal and / or the congestion control level and / or the QoS parameters and / or the CBR (channel busy ratio) / CR (channel occupancy ratio) level, etc.

[0258] Table 22 shows an example of SL CBR (channel busy ratio) and SL RSSI (received signal strength indicator).

[0259] [Table 22]

[0260] Referring to Table 22, the slot index is based on the physical slot index.

[0261] Table 23 shows an example of SL CR (channel occupancy ratio).

[0262] [Table 23]

[0263] Here, a is a positive integer and b is 0 or a positive integer. Depending on the upper layer parameter sl-TimeWindowSizeCR, a and b are a+b+1=1000 or 1000 2 uThe SL CR is determined by the UE implementation using slots, b<(a+b+1) / 2, and n+b does not exceed the last transmission opportunity of the grant for the current transmission. The SL CR is evaluated for each (re)transmission. When evaluating the SL CR, the UE must assume that the transmission parameters used in slot n can be reused by the existing grant(s) in slot [n+1, n+b] without packet drops. The slot index is based on the physical slot index. The SL CR can be calculated per priority level. A resource is considered granted if it is a member of the selected sidelink grant.

[0264] For example, when reserving resources for different TBs, the terminal may restrict the selected resources for the PSSCH to be in one or more consecutive (sidelink) slots and / or the same RB set(s).

[0265] For example, when a terminal performs multiple different resource (re)selection processes, it may restrict the selected resources for the PSSCH derived from each resource (re)selection process to be within a single or multiple consecutive (sidelink) slots and / or the same RB sets.

[0266] For example, when a terminal performs a resource (re)selection process, the terminal may consider / include the time and / or frequency and location of the selected resources for the first PSSCH derived in another resource (re)selection process of the terminal, and restrict the selected resources for the second PSSCH to be within one or more consecutive (sidelink) slots and / or the same RB set(s).

[0267] For example, when a terminal performs a first resource (re)selection process for a specific TB and / or specific periodic traffic, it may prioritize selecting, as PSSCH transmission resources, at least all or some of the frequency resources of slots (immediately preceding and / or following) all or some of the PSSCH transmission resource slots derived in a second resource (re)selection process for another TB and / or another periodic traffic. For example, for each slot for which resource selection is prioritized, the partial frequency resources may be frequency resources in all or some of the RB sets including the PSSCH transmission resources derived in the second resource (re)selection process corresponding to the prioritized slot. For example, the resource reservation period value for the second resource (re)selection process may be smaller than or equal to the resource reservation period value for the first resource (re)selection process. For example, the PSSCH transmission resource slots in a specific period derived in the second resource (re)selection process may include adjacent slots before and / or after all or some of the PSSCH transmission resource slots in a single period and / or multiple periods derived in the first resource (re)selection process. For example, the resource reservation periodicity value for the second resource (re)selection process may be greater than or equal to the resource reservation periodicity value for the first resource (re)selection process, and in this case, depending on the periodicity for the second resource (re)selection process, the PSSCH transmission slots derived from the first and second resource (re)selection processes may or may not be adjacent to each other.

[0268] In an embodiment of the present disclosure, the resource (re)selection process can accommodate aperiodic traffic, in which case the resource reservation period value can be 0.

[0269] In an embodiment of the present disclosure, the (preceding) relationship between the PSSCH transmission resource slot derived in the first resource (re)selection process and the PSSCH transmission resource slot derived in the second resource (re)selection process may differ depending on the relationship between the CAPC value for the first resource (re)selection process and the CAPC value for the second resource (re)selection process. For example, if the CAPC value for the first resource (re)selection process is greater than or equal to the CAPC value for the second resource (re)selection process, the PSSCH transmission slot derived in the first resource (re)selection process may include all or part of the preceding slot adjacent to the PSSCH transmission slot derived in the second resource (re)selection process. For example, if the CAPC value for the first resource (re)selection process is less than or equal to the CAPC value for the second resource (re)selection process, the PSSCH transmission slot derived in the first resource (re)selection process may include all or part of the following slot adjacent to the PSSCH transmission slot derived in the second resource (re)selection process.

[0270] For example, the CAPC value for the first resource (re)selection process may be restricted to be greater than or equal to the CAPC value for the second resource (re)selection process, in which case the terminal can perform channel access for transmission on the PSSCH transmission resources derived in the first and second resource (re)selection processes based on the (latest) CAPC value for the later first resource (re)selection process.

[0271] For example, the CAPC value for the first resource (re)selection process may be limited to be less than or equal to the CAPC value for the second resource (re)selection process, in which case the terminal can perform channel access to the PSSCH transmission resource derived in the preceding second resource (re)selection process, and can transmit in the unlicensed band using the PSSCH transmission resource derived in the subsequent first resource (re)selection process without performing a separate Type 1 channel access.

[0272] For example, the CAPC value for a first resource (re)selection process can be restricted to always be the same as the CAPC value for a second resource (re)selection process.

[0273] In the embodiment of the present disclosure, a method for generating an SL transmission burst using two resource (re)selection processes has been described, but the concept of the present disclosure can also be extended to generate an SL transmission burst shape between PSSCH transmission resources derived by three or more resource (re)selection processes.

[0274] On the other hand, for time- and / or frequency-adjacent sidelink transmission groups (SL transmission bursts) derived from single and / or multiple resource (re)selection processes, the UE may release retransmission resources after ACKing the transmission if resource reselection or transmission omission / drop occurs for a specific resource of the transmission group. In such cases, the SL transmission burst is interrupted midway, and the UE may not be able to omit further channel sensing operations.

[0275] For example, when the UE omits a specific sidelink transmission in an SL transmission burst and / or performs resource reselection, the UE may also perform transmission omission and / or resource reselection for all or part of the remaining transmission resources in the SL transmission burst after the sidelink transmission resource. For example, when the UE omits a specific sidelink transmission in an SL transmission burst and / or performs resource reselection, the UE may omit transmission and / or perform resource reselection for only part of the remaining transmission resources after the sidelink transmission resource, for which channel sensing can be performed for the remaining transmission in the SL transmission burst. For example, when the UE performs resource reselection for transmission resources in the SL transmission burst, target transmission resources may be adjacent to each other even in the reselected resources. For example, when the UE performs resource reselection for transmission resources in the SL transmission burst, the UE may perform resource reselection independently for each target transmission resource.

[0276] For example, if the UE omits a particular sidelink transmission within an SL transmission burst and / or performs resource reselection, the UE may perform resource reselection for all or some of the remaining transmission resources in a manner that refills or occupies the omitted sidelink transmission resources for the remaining transmissions in the SL transmission burst after the sidelink transmission resource and / or maintains the SL transmission burst again. For example, if the UE releases resource usage for some resources in an SL transmission burst to determine ACK, and / or if the RB sets for the remaining resources in the SL transmission burst belong to the RB sets for the released resources, and / or if the assigned PRBs for the remaining resources in the SL transmission burst belong to the PRBs for the released resources, and / or if the SL priority value for the remaining resources in the SL transmission burst is equal to and / or greater than the SL priority value for the released resources, and / or if the CAPC value for the remaining resources in the SL transmission burst is equal to and / or less than the CAPC value for the released resources, the UE may omit the RSRP measurement and / or resource eviction operation during the resource reselection.

[0277] In an embodiment of the present disclosure, when a terminal omits transmission and / or reselects resources for a specific sidelink transmission resource within an SL transmission burst, whether to continue transmission or omit transmission and / or reselect resources for the remaining transmission resources within the SL transmission burst may be determined differently depending on the number of remaining transmission resources within the SL transmission burst and / or whether the (remaining) PDB for the sidelink transmission and / or the length of the channel sensing interval for the remaining transmission are sufficient.

[0278] On the other hand, a PSFCH transmission may occur at the beginning and / or middle of an SL transmission burst, and the CAPC value for the PSFCH and the CAPC value for the PSSCH transmission may differ. For example, the UE may apply / assume the CAPC value for the PSFCH in the SL transmission burst instead of the CAPC value for a specific PSSCH in the SL transmission burst. For example, the CAPC value for the specific PSSCH may be the CAPC value assumed / used when performing channel access for the SL transmission burst. For example, the CAPC value assumed / used when performing channel access for the SL transmission burst may be the CAPC value for the PSSCH and / or the CAPC value for the PSFCH in the SL transmission burst and / or the maximum value for the combination and / or the minimum value for the combination. For example, if the CAPC value for the PSFCH in the SL transmission burst is larger than the CAPC value used when accessing the channel for the SL transmission burst, the UE may perform channel sensing for the PSFCH transmission using the type 1 channel access procedure using the CAPC value for the PSFCH. For example, if the CAPC value for the PSFCH in an SL transmission burst is greater than the CAPC value used during channel access for the SL transmission burst, the UE may omit the PSFCH transmission. For example, the UE may omit the PSFCH RX operation in the SL transmission burst and perform sidelink transmission in the PSFCH occasion.

[0279] On the other hand, when the terminal performs a resource (re)selection process, if it determines to select transmission resources while avoiding resources reserved for other terminals (based on RSRP measurement values, transmission priority values, and / or reception priority values, etc.), the terminal may need to exclude resources (within the same RB set) within the (reference) channel sensing interval for the reserved resources and / or resources (within the same RB set) within the (reference) channel sensing interval when the terminal uses the transmission resources. On the other hand, if the reserved resources for other terminals and the terminal's transmission resources are configured using multi-consecutive slots transmission (MCSt), the terminal may conversely select transmission resources adjacent to the reserved resources of other terminals. On the other hand, when the terminal performs a resource (re)selection process, the terminal may select transmission resources while avoiding already selected resources for other SL grants or TBs of the terminal, and / or the terminal may need to exclude resources (within the same RB set) within the (reference) channel sensing interval for the already selected resources and / or resources (within the same RB set) within the (reference) channel sensing interval when the terminal's current transmission resources are used.

[0280] For example, if the CAPC value of the terminal's already selected resource is greater than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the reference power during maximum transmission power and / or channel sensing operation for the transmission resource pool to which the terminal's already selected resource belongs is greater than and / or equal to the reference power during maximum transmission power and / or channel sensing for the transmission resource pool for resource (re)selection, the terminal can configure the MCSt in a way that selects a resource at a later time point or the same time point in time as the already selected resource (without considering additional gaps).

[0281] For example, if the CAPC value of the already selected resource of the terminal is greater than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the reference power during maximum transmit power and / or channel sensing operation for the transmission resource pool to which the already selected resource of the terminal belongs is greater than and / or equal to the reference power during maximum transmit power and / or channel sensing for the transmission resource pool for resource (re)selection, the terminal may select a transmission resource in a time ahead of the already selected resource while avoiding only the already selected resource and / or resources in the reference channel sensing interval for the already selected resource. That is, in the above situation, whether or not an additional time gap outside the already selected resource is considered when selecting a resource may differ depending on whether the terminal's transmission resource selection is before and / or after the already selected resource.

[0282] For example, the length of the reference channel sensing interval may be (pre)set for each resource pool and / or for each CAPC value and / or for each SL priority value and / or for each SL channel type, and / or may be determined based on the length of the channel sensing interval for the Type 1 channel access procedure. For example, the length of the reference channel sensing interval may be the length of the channel sensing interval for the Type 1 channel access procedure calculated based on the maximum CWS according to the CAPC value (assuming that the result of the defer duration and / or sensing slot is a holiday). For example, the length of the reference channel sensing interval may be the defer duration value according to the CAPC value. For example, the length of the reference channel sensing interval may be the length of the actual channel sensing interval.

[0283] For example, if the CAPC value of the terminal's already selected resource is smaller and / or equal to the transmission CAPC value for resource (re)selection, and / or if the reference power during maximum transmission power and / or channel sensing operation for the transmission resource pool to which the terminal's already selected resource belongs is smaller and / or equal to the reference power during maximum transmission power and / or channel sensing operation for the transmission resource pool for resource (re)selection, the terminal can configure the MCSt in a way that selects a resource at an earlier point in time (or the same point in time) of the already selected resource (without considering additional gaps).

[0284] For example, if the CAPC value of the already selected resource of the UE is less than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the reference power during maximum transmit power and / or channel sensing operation for the transmission resource pool to which the already selected resource of the UE belongs is less than and / or equal to the reference power during maximum transmit power and / or channel sensing operation for the transmission resource pool for resource (re)selection, the UE may select a transmission resource from a resource that is later in time than the already selected resource while avoiding resources of only the reference channel sensing interval of the already selected resource and / or transmission resource for resource (re)selection. For example, the length of the reference channel sensing interval may be determined based on the UE's transmit CAPC value for resource (re)selection. For example, when the UE performs transmission using the transmission resource via COT sharing and / or uses a type 2 series channel access procedure, avoiding resources of only the reference channel sensing interval of the transmission resource may be omitted.

[0285] For example, if the CAPC value of an already reserved resource (of another terminal) is greater than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the terminal's transmission and / or transmission burst includes a terminal using the already reserved resource as a recipient, and / or if the terminal is initialized from an already reserved resource or satisfies the COT sharing conditions of a terminal using the already reserved resource, the terminal can configure the MCSt in a way that selects a resource at a later point in time or (at the same point in time) as the already reserved resource (without considering additional gaps).

[0286] For example, if the CAPC value of an already reserved resource (of another terminal) is greater than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the terminal's transmission and / or transmission burst does not include the terminal using the already reserved resource as a recipient, and / or if the terminal is initialized from the already reserved resource or cannot satisfy the COT sharing conditions of the terminal using the already reserved resource, the terminal can select a transmission resource at a later point in time from the already reserved resource in a manner avoiding only the resources of the reference channel sensing interval of the already reserved resource and / or the transmission resource for resource (re)selection.

[0287] For example, if the CAPC value of an already reserved resource (of another terminal) is greater than and / or equal to the transmission CAPC value for resource (re)selection, and / or if the terminal's transmission and / or transmission burst includes a terminal using the already reserved resource as a recipient, and / or if the terminal is initialized from an already reserved resource or satisfies the COT sharing conditions of a terminal using the already reserved resource, the terminal can select a transmission resource at an earlier point in time for the already reserved resource in a manner avoiding the already reserved resource and / or resources of only the reference channel sensing interval for the already reserved resource.

[0288] That is, in the above situation, depending on whether the terminal selects a transmission resource before and / or after the already reserved resource, whether or not additional time gaps outside the already selected resource are taken into consideration when selecting resources may differ.

[0289] For example, if the CAPC value of an already reserved resource (of another terminal) is smaller and / or equal to the transmission CAPC value for resource (re)selection, and / or if a transmission or transmission burst using already reserved resources includes at least the terminal (re)selecting the resource as a recipient, and / or if the transmitting terminal intends / decides COT sharing for a transmission using already reserved resources, the terminal may configure the MCSt in a manner that selects resources at an earlier point in time (or the same point in time) as the already reserved resources (without considering additional gaps). For example, in the above cases, the terminal may include COT sharing information in PSCCH / PSSCH transmission via the transmission resources.

[0290] For example, if a transmitting terminal intends / decides to share COT for a transmission using a previously reserved resource, the terminal may preferentially select a resource from an earlier point in time than the previously reserved resource. For example, in this case, the terminal may include COT sharing information in a PSCCH / PSSCH transmission via a transmission resource.

[0291] 14 illustrates an example in which a terminal prevents other terminals from blocking channel access through COT sharing according to one embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0292] 14, another terminal can reserve resource B, and the terminal can learn that resource B has been reserved by the other terminal through sensing (e.g., SCI monitoring). In this case, the terminal cannot determine whether its own resource reservation and transmission will block channel access by the other terminal because it does not know the type and / or time of channel access performed by the other terminal. To solve this problem, when the terminal intends / decides to share COT for a transmission using an already reserved resource (i.e., a transmission using resource B), the terminal can preferentially select a resource (i.e., resource A) at an earlier time point in time than the already reserved resource, and the terminal can include COT sharing information in PSCCH / PSSCH transmission via the transmission resource.

[0293] In the above case, other terminals that receive the COT sharing information can perform a channel access procedure based on channel access type 2, which has a relatively short channel access time, so that the resource selection and transmission by the terminal may not interfere with the channel access of other terminals.

[0294] For example, if the CAPC value of an already reserved resource (of another terminal) is smaller than and / or equal to the transmission CAPC value for resource (re)selection, and / or if a transmission or transmission burst using an already reserved resource does not include at least the terminal (re)selecting the resource as a recipient, and / or if the transmitting terminal does not intend / decide COT sharing for a transmission using an already reserved resource, the terminal may select a transmission resource at an earlier point in time for the already reserved resource in a manner that avoids the already reserved resource and / or resources of only the reference channel sensing interval for the already reserved resource.

[0295] For example, if the CAPC value of an already reserved resource (of another terminal) is smaller and / or equal to the transmission CAPC value for resource (re)selection, and / or if a transmission or transmission burst using an already reserved resource includes at least the terminal (re)selecting the resource as a recipient, and / or if the transmitting terminal intends / decides COT sharing for a transmission using an already reserved resource, the terminal can select a transmission resource at a later point in time for the already reserved resource in a manner that avoids only the resources of the reference channel sensing interval of the already reserved resource and / or the transmission resource for resource (re)selection.

[0296] For example, if a guard band is configured for an SL BWP and / or an SL resource pool and / or an RB set, in an embodiment of the present disclosure, the resource avoidance target resources for the reference channel sensing interval may be limited to resources within the RB set to which the resource corresponding to the reference channel sensing belongs.

[0297] For example, if a guard band is not configured for an SL BWP and / or an SL resource pool and / or an RB set, in an embodiment of the present disclosure, the resource(s) to be avoided for the reference channel sensing interval may be extended to resources in other RB sets in addition to resources in the RB set to which the resource corresponding to the reference channel sensing belongs. For example, if a guard band is not configured for an SL BWP and / or an SL resource pool and / or an RB set, in an embodiment of the present disclosure, the resource(s) to be avoided for the reference channel sensing interval may be all resources in the corresponding slot. For example, the other RB set may belong to the resource pool to which the resource corresponding to the reference channel sensing belongs.

[0298] For example, when the terminal selects transmission resources before the S-SSB resource slot, the terminal may select transmission resources by avoiding all or part of the resources corresponding to the reference channel sensing interval for S-SSB transmission. For example, in the above example, if the terminal determines that the S-SSB resource configuration uses a channel access type of Type 2, the avoidance procedure for the reference channel sensing interval may be omitted.

[0299] For example, when the terminal selects a transmission resource after the time of the S-SSB resource slot, the terminal can select the transmission resource in a manner that avoids all or part of the resource corresponding to the reference channel sensing interval for the transmission resource.

[0300] For example, in the case of S-SSB transmission and reception, since S-SSB transmission and reception may be of higher importance than other SL channel types, the terminal may prioritize and avoid all or part of the S-SSB resources and / or resources corresponding to the reference channel sensing interval for S-SSB transmission when selecting transmission resources, regardless of the comparison between SL priorities and / or the comparison between CAPC values.

[0301] For example, when it is determined that a Type 2 series channel access procedure is to be used for an already reserved resource or a selected resource, the terminal may omit protection operations (excluding from available resource candidates and / or avoiding when selecting a transmission resource) for the time and frequency resources (within the RB set) prior to the already reserved resource or the selected resource. For example, this may be the case when a Type 2 series channel access procedure is indicated in the PSCCH / PSSCH in which information for the already reserved resource is received. For example, this may be the case when the already selected resource and / or the selected resource belongs to a burst transmission. For example, this may be the case when the transmitting terminal provides COT sharing information to the terminal using the already reserved resource and / or when the reserved resource exists within the COT interval and RB set. For example, this may be the case when the already selected resource exists within the time interval and RB set according to the COT sharing information received by the terminal for the already selected resource and / or when the transmission used for the selected resource satisfies the COT sharing requirements (CAPC restriction and / or receiver restriction).

[0302] For example, when selecting and / or reselecting resources, the resource collision criterion and / or resource reselection criterion may be different for the transmission resources of the first slot constituting the UE's MCSt and the remaining slots. For example, when selecting and / or reselecting resources, the resource collision criterion and / or resource reselection criterion may be different for the resources constituting the UE's MCSt in time, the early portion, the middle portion, and / or the last portion. For example, the early portion, the middle portion, and / or the last portion may be determined according to a predefined or (pre)set ratio with respect to the total number of slots constituting the MCSt. For example, the early portion, the middle portion, and / or the last portion may be determined according to a predefined or (pre)set threshold number of slots. For example, different resource collision criterion and / or resource reselection criterion for each resource (group) constituting the MCSt may be achieved by separately setting / managing / determining RSRP thresholds for each resource. For example, resource collision and / or resource reselection may not be indicated and / or the conditions for such indication may be relaxed for resources corresponding to the middle portion of the resources constituting the MCSt. The advantage of this is that it can prevent the length of the actual MCSt section from being shortened due to resource reselection during MCSt.

[0303] In an embodiment of the present disclosure, whether and how the terminal provides COT information and / or whether and how it indicates PSSCH time resources may vary depending on the CAPC value and / or CAPC table and / or length of the COT interval used for COT initialization.

[0304] In the embodiment of the present disclosure, the method of providing time domain resources is merely an example, and the concept of the present disclosure can be extended and applied to a method of providing time domain resources and / or frequency domain resources.

[0305] The methods described in the embodiments of the present disclosure can operate in different combinations depending on whether the transmitting terminal is transmitting within a COT initialized by the transmitting terminal, or transmitting within a shared COT acquired by the transmitting terminal from another transmitting node, or outside the COT.

[0306] According to various embodiments of the present disclosure, a terminal may determine candidate values ​​for the number of (consecutive) slots corresponding to a candidate multi-slot resource or candidate resource and / or the number of slots for consecutive candidate single-slot resources, and may select a (final) value from among the candidate values. This allows the terminal to adaptively select the number of slots for multi-consecutive slots transmission (MCSt) taking into account a CAPC value, priority, QoS requirements, channel conditions, etc., related to sidelink transmission, thereby ensuring reliability of sidelink communication in unlicensed bands. Furthermore, the resource (re)selection process can efficiently ensure MCSt-type transmission and reduce the possibility of MCSt-type disruption, thereby improving the transmission probability in unlicensed bands. Furthermore, the possibility of other RATs intruding into the COT interval can be reduced.

[0307] According to various embodiments of the present disclosure, when a terminal intends / determines COT sharing for transmission using already reserved resources, the terminal may preferentially select resources from an earlier time point in the already reserved resources, and the terminal may include COT sharing information in PSCCH / PSSCH transmission via the transmission resources. In this case, other terminals that receive the COT sharing information may perform a channel access procedure based on channel access type 2, which has a relatively short channel access time, so that resource selection and transmission by the terminal may not interfere with channel access of other terminals. Therefore, problems such as inefficient resource use in unlicensed bands and communication delays in unlicensed bands may be resolved.

[0308] 15 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0309] Referring to FIG. 15, in step S1510, a first device may receive first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH). In step S1520, the first device may acquire a channel occupancy time (COT). In step S1530, the first device may select a second resource prior to the first resource based on the first device being configured to share the COT for transmission on the first resource reserved by the resource assignment information. In step S1540, the first device may transmit information for sharing the COT on the second resource to the second device.

[0310] For example, the second resource before the first resource may be preferentially selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

[0311] For example, the COT is exposed by the first device.

[0312] For example, the COT may be initiated by the first device based on a channel access procedure in which the time interval across a sensing slot sensed as being idle prior to transmission is random.

[0313] For example, the second resource may be located earlier in time than the first resource.

[0314] For example, the information for sharing the COT is transmitted to the second device via a physical sidelink shared channel (PSSCH), for example, the information for sharing the COT is included in a second SCI on the PSSCH.

[0315] For example, the time domain of the first resource is within the COT.

[0316] For example, the channel access procedure performed by the second device within the COT may be a channel access procedure in which the time interval spanning the sensing slot sensed as being idle prior to transmission is deterministic, e.g., 25 microseconds, 16 microseconds, or zero.

[0317] For example, the second resource may be selected from a time region that is earlier than the first resource by a processing time associated with the information for sharing the COT.

[0318] For example, the second resource may be selected by the first device before the first resource based on a channel access priority class (CAPC) value associated with the first resource being less than or equal to a CAPC value associated with the second resource.

[0319] For example, the second resource before the first resource may be selected by the first device based on the fact that the target of the transmission on the first resource includes the first device.

[0320] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 106 to receive first sidelink control information (SCI) including resource assignment information from the second device via a physical sidelink control channel (PSCCH). Then, the processor 102 of the first device 100 can acquire a channel occupancy time (COT). Then, the processor 102 of the first device 100 can select a second resource before the first resource based on the resource assignment information being configured to share the COT for transmission on the first resource. Then, the processor 102 of the first device 100 can control the transceiver 106 to transmit information for sharing the COT on the second resource to the second device.

[0321] According to an embodiment of the present disclosure, there is provided a first device configured to perform wireless communication. For example, the first device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: receive first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); acquire a channel occupancy time (COT); select a second resource that is before the first resource based on a configuration to share the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device.

[0322] According to an embodiment of the present disclosure, there is provided a processing device configured to control a first device. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: receive, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) including resource assignment information from a second device; acquire a channel occupancy time (COT); select a second resource prior to the first resource based on a configuration for sharing the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device.

[0323] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions may be provided that, when executed, cause a first device to: receive, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) including resource assignment information from a second device; acquire a channel occupancy time (COT); select a second resource that is before the first resource based on a configuration for sharing the COT for transmission on a first resource reserved by the resource assignment information; and transmit information for sharing the COT on the second resource to the second device.

[0324] 16 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 16 can be combined with various embodiments of the present disclosure.

[0325] Referring to FIG. 16, in step S1610, a second device may select a first resource. In step S1620, the second device may transmit first sidelink control information (SCI) including resource assignment information related to the first resource to a first device via a physical sidelink control channel (PSCCH). In step S1630, the second device may receive information for sharing a channel occupancy time (COT) on a second resource from the first device. For example, the second resource before the first resource may be selected by the first device based on the setting to share the COT for transmission on the first resource reserved by the resource assignment information.

[0326] For example, the second resource before the first resource may be preferentially selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

[0327] For example, the COT is exposed by the first device.

[0328] For example, the COT may be initiated by the first device based on a channel access procedure in which the time interval across a sensing slot sensed as being idle prior to transmission is random.

[0329] For example, the second resource may be located earlier in time than the first resource.

[0330] For example, the information for sharing the COT is transmitted to the second device via a physical sidelink shared channel (PSSCH), for example, the information for sharing the COT is included in a second SCI on the PSSCH.

[0331] For example, the time domain of the first resource is within the COT.

[0332] For example, the channel access procedure performed by the second device within the COT may be a channel access procedure in which the time interval spanning the sensing slot sensed as being idle prior to transmission is deterministic, e.g., 25 microseconds, 16 microseconds, or zero.

[0333] For example, the second resource may be selected from a time region that is earlier than the first resource by a processing time associated with the information for sharing the COT.

[0334] For example, the second resource may be selected by the first device before the first resource based on a channel access priority class (CAPC) value associated with the first resource being less than or equal to a CAPC value associated with the second resource.

[0335] For example, the second resource before the first resource may be selected by the first device based on the fact that the target of the transmission on the first resource includes the first device.

[0336] The proposed method may be applied to devices according to various embodiments of the present disclosure. First, processor 202 of second device 200 may select a first resource. Then, processor 202 of second device 200 may control transceiver 206 to transmit, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) including resource assignment information related to the first resource to a first device. Then, processor 202 of second device 200 may control transceiver 206 to receive, from the first device, information for sharing a channel occupancy time (COT) on a second resource. For example, the second resource before the first resource may be selected by the first device based on the setting for sharing the COT for transmission on the first resource reserved by the resource assignment information.

[0337] According to one embodiment of the present disclosure, there is provided a second device configured to perform wireless communication. For example, the second device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: select a first resource; transmit first sidelink control information (SCI) including resource assignment information related to the first resource to a first device via a physical sidelink control channel (PSCCH); and receive information for sharing a channel occupancy time (COT) on a second resource from the first device. For example, the second resource prior to the first resource may be selected by the first device based on the configuration for sharing the COT for transmission on the first resource reserved by the resource assignment information.

[0338] According to an embodiment of the present disclosure, there is provided a processing device configured to control a second device. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: select a first resource; transmit first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first SCI including resource assignment information related to the first resource; and receive, from the first device, information for sharing a channel occupancy time (COT) on a second resource. For example, the second resource prior to the first resource may be selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource assignment information.

[0339] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions may be provided. For example, the instructions, when executed, may cause a second device to: select a first resource; transmit first sidelink control information (SCI) including resource assignment information related to the first resource to a first device via a physical sidelink control channel (PSCCH); and receive information for sharing a channel occupancy time (COT) on a second resource from the first device. For example, the second resource prior to the first resource may be selected by the first device based on a configuration for sharing the COT for transmission on the first resource reserved by the resource assignment information.

[0340] Various embodiments of the present disclosure may be intercombined.

[0341] An apparatus to which various embodiments of the present disclosure are applied will be described below.

[0342] 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).

[0343] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the following drawings and description, unless otherwise specified, the same reference numerals in the same drawings may represent the same or corresponding hardware blocks, software blocks, or function blocks.

[0344] 17 illustrates a communication system 1 according to one embodiment of the present disclosure. The embodiment of FIG. 17 can be combined with various embodiments of the present disclosure.

[0345] 17 , 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.

[0346] 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.

[0347] 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, a 5G (e.g., NR) network, or the like. 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 other IoT devices (for example, sensors) or other wireless devices 100a to 100f.

[0348] 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.

[0349] 18 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 18 can be combined with various embodiments of the present disclosure.

[0350] 18, 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.

[0351] 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.

[0352] 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.

[0353] 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) according to 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 according to 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.

[0354] 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. As an 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 flow charts 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.

[0355] 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. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0356] 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.

[0357] 19 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 19 can be combined with various embodiments of the present disclosure.

[0358] 19, a 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. 19 may be performed by the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 18. The hardware elements of FIG. 19 may be embodied in the processors 102 and 202 and / or the transceivers 106 and 206 of FIG. 18. For example, blocks 1010 to 1060 may be embodied in the processors 102 and 202 of FIG. 18. Furthermore, blocks 1010 to 1050 may be embodied in the processors 102 and 202 of FIG. 18, and block 1060 may be embodied in the transceivers 106 and 206 of FIG. 18.

[0359] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 19. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a transmission block of an UL-SCH, a transmission block of a DL-SCH). The radio signal can be transmitted via various physical channels (e.g., a PUSCH, a PDSCH).

[0360] 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.

[0361] 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.

[0362] 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. 19. For example, a wireless device (e.g., 100 or 200 in FIG. 18) may receive a wireless signal from an external device via 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.

[0363] 20 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. 17). The embodiment of FIG. 20 may be combined with various embodiments of the present disclosure.

[0364] 20, wireless devices 100, 200 correspond to the wireless devices 100, 200 of FIG. 18 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100, 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, 202 and / or one or more memories 104, 204 of FIG. 17. For example, the transceiver(s) 114 may include one or more transceivers 106, 206 and / or one or more antennas 108, 208 of FIG. 18. 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. Furthermore, 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.

[0365] 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. 17), a vehicle (100b-1, 100b-2 in FIG. 17), an XR device (100c in FIG. 17), a mobile device (100d in FIG. 17), a home appliance (100e in FIG. 17), an IoT device (100f in FIG. 17), 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. 17), a base station (200 in FIG. 17), a network node, etc. The wireless device may be mobile or fixed depending on the use case / service.

[0366] 20, 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.

[0367] The embodiment of FIG. 20 will now be described in more detail with reference to other drawings.

[0368] FIG. 21 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. 21 may be combined with various embodiments of the present disclosure.

[0369] 21, 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. 20, respectively.

[0370] 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 or 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.

[0371] 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. Furthermore, the communication unit 110 may 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.

[0372] 22 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. 22 may be combined with various embodiments of the present disclosure.

[0373] 22, 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. 20, respectively.

[0374] 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.

[0375] 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., speed / direction adjustment) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. During the 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 the 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, the autonomous driving route, the 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.

[0376] The claims described herein may be combined in various ways. For example, the technical features of the method claims herein may be combined and embodied in an apparatus, and the technical features of the apparatus claims herein may be combined and embodied in a method. Furthermore, the technical features of the method claims herein and the technical features of the apparatus claims herein may be combined and embodied in an apparatus, and the technical features of the method claims herein and the technical features of the apparatus claims herein may be combined and embodied in a method.

[0377] [Claims at the time of international application] [Claim 1] 1. A method for a first device to perform wireless communication, comprising: receiving, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) including resource assignment information from a second device; Step to acquire COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and sending information to the second device for sharing the COT on the second resource. [Claim 2] 2. The method of claim 1, wherein the second resource before the first resource is preferentially selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information. [Claim 3] The method of claim 1 , wherein the COT is initiated by the first device. [Claim 4] The method of claim 1 , wherein the COT is disclosed by the first device based on a channel access procedure in which the time interval spanning a sensing slot sensed as being absent prior to transmission is random. [Claim 5] The method of claim 1 , wherein the second resource is located in time earlier than the first resource. [Claim 6] The method of claim 1 , wherein the information for sharing the COT is transmitted to the second device via a physical sidelink shared channel (PSSCH). [Claim 7] The method of claim 6, wherein the information for sharing the COT is included in a second SCI on the PSSCH. [Claim 8] The method of claim 1 , wherein the time domain of the first resource is within the COT. [Claim 9] The method of claim 1, wherein the channel access procedure performed by the second device within the COT is a channel access procedure in which the time interval spanning a sensing slot sensed as being idle prior to transmission is deterministic. [Claim 10] 10. The method of claim 9, wherein the time interval is 25 microseconds, 16 microseconds, or zero. [Claim 11] The method of claim 1 , wherein the second resource is selected from a time region that is at least a processing time ahead of the first resource and that is associated with information for sharing the COT. [Claim 12] 2. The method of claim 1, wherein the second resource before the first resource is selected by the first device based on a channel access priority class (CAPC) value associated with the first resource being less than or equal to a CAPC value associated with the second resource. [Claim 13] The method of claim 1 , wherein the second resource before the first resource is selected by the first device based on the fact that the target of the transmission on the first resource includes the first device. [Claim 14] a first device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is receiving first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); Earning COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and The first device transmits information to the second device for sharing the COT on the second resource. [Claim 15] a processing device configured to control a first device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is receiving first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); Earning COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and and transmitting information to the second device for sharing the COT on the second resource. [Claim 16] A non-transitory computer-readable storage medium having instructions recorded thereon, the instructions, upon being executed, cause the first device to perform an action; The operation is receiving first sidelink control information (SCI) including resource assignment information from a second device via a physical sidelink control channel (PSCCH); Earning COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and and transmitting information to the second device for sharing the COT on the second resource. [Claim 17] 1. A method for a second device to communicate wirelessly, comprising: selecting a first resource; transmitting, via a physical sidelink control channel (PSCCH), first sidelink control information (SCI) including resource assignment information related to the first resource to a first device; and receiving information for sharing a channel occupancy time (COT) from the first device on a second resource; The method, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information. [Claim 18] a second device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an action; The operation is Select the first resource; Sending first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information for sharing a channel occupancy time (COT) on a second resource from the first device; A second device, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information. [Claim 19] a processing device configured to control a second device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an action; The operation is Select the first resource; Sending first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information for sharing a channel occupancy time (COT) on a second resource from the first device; A processing device, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information. [Claim 20] A non-transitory computer-readable storage medium having instructions recorded thereon, the instructions, upon being executed, cause the second device to perform an action; The operation is Select the first resource; Sending first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information for sharing a channel occupancy time (COT) on a second resource from the first device; A non-transitory computer-readable storage medium, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

Claims

1. 1. A method for performing wireless communication in a first device, comprising: receiving, via a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) including resource assignment information from a second device; acquiring a channel occupancy time (COT); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and transmitting information to the second device to share the COT on the second resource.

2. 2. The method of claim 1, wherein the second resource before the first resource is preferentially selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

3. The method of claim 1 , wherein the COT is initiated by the first device.

4. The method of claim 1 , wherein the COT is disclosed by the first device based on a channel access procedure that is random in time interval across a sensing slot sensed as being idle prior to transmission.

5. The method of claim 1 , wherein the second resource is located in time before the first resource.

6. The method of claim 1 , wherein the information for sharing the COT is transmitted to the second device via a physical sidelink shared channel (PSSCH).

7. The method of claim 6 , wherein the information for sharing the COT is included in a second SCI on the PSSCH.

8. The method of claim 1 , wherein the time domain of the first resource is within the COT.

9. 2. The method of claim 1, wherein the channel access procedure performed by the second device within the COT is a channel access procedure in which the time interval spanning a sensing slot sensed as being idle prior to transmission is deterministic.

10. 10. The method of claim 9, wherein the time interval is 25 microseconds, 16 microseconds, or zero.

11. The method of claim 1 , wherein the second resource is selected from a time region that is at least a processing time ahead of the first resource and that is associated with information for sharing the COT.

12. 2. The method of claim 1, wherein the second resource is selected by the first device prior to the first resource based on a channel access priority class (CAPC) value associated with the first resource being less than or equal to a CAPC value associated with the second resource.

13. The method of claim 1 , wherein the second resource before the first resource is selected by the first device based on the fact that the target of the transmission on the first resource includes the first device.

14. a first device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is receiving a first sidelink control information (SCI) from a second device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information; Acquire COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and and transmitting information to the second device for sharing the COT on the second resource.

15. a processing device configured to control a first device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is receiving a first sidelink control information (SCI) from a second device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information; Acquire COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and and transmitting information to the second device for sharing the COT on the second resource.

16. A non-transitory computer-readable storage medium having instructions recorded thereon, the instructions, upon being executed, cause the first device to perform an action; The operation is receiving a first sidelink control information (SCI) from a second device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information; Acquire COT (channel occupancy time); selecting a second resource before the first resource based on the resource allocation information being configured to share the COT for transmission on the reserved first resource; and and transmitting to the second device information for sharing the COT on the second resource.

17. 1. A method for wireless communication by a second device, comprising: selecting a first resource; transmitting, via a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) including resource assignment information related to the first resource to a first device; and receiving information for sharing a channel occupancy time (COT) from the first device on a second resource; The method, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

18. a second device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an operation; The operation is Select the first resource; Sending a first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information from the first device for sharing channel occupancy time (COT) on a second resource; A second device, wherein the second resource preceding the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

19. a processing device configured to control a second device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an operation; The operation is Select the first resource; Sending a first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information from the first device for sharing channel occupancy time (COT) on a second resource; A processing device, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

20. A non-transitory computer-readable storage medium having instructions recorded thereon, the instructions, upon being executed, cause the second device to perform an action; The operation is Select the first resource; Sending a first sidelink control information (SCI) to a first device via a physical sidelink control channel (PSCCH), the first sidelink control information including resource assignment information related to the first resource; and receiving information from the first device for sharing channel occupancy time (COT) on a second resource; A non-transitory computer-readable storage medium, wherein the second resource before the first resource is selected by the first device based on being configured to share the COT for transmission on the first resource reserved by the resource allocation information.

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