Channel sensing method and apparatus for sidelink user equipment with half-duplex constraints in unlicensed band

Abstract

A method of operation of a first apparatus (100) in a wireless communication system is presented. The operation method may comprise the steps of: obtaining information on a first resource reserved by a second device based on decoding for SCI; obtaining information about the COT portion; selecting a second resource for transmitting information about the COT portion, the second resource being a resource of N time slots before the first resource; and transmitting information on the COT portion to the second device based on the second resource.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system. Background Art

[0002] A sidelink (SL) refers to a communication method in which a direct link is configured between user equipments (UEs), and voice or data is directly exchanged between the UEs without passing through a base station (BS). Considering SL as a solution to the burden on the BS caused by the rapid increase in data traffic. Vehicle-to-everything (V2X) refers to a communication technology that exchanges information with other vehicles, pedestrians, and objects equipped with infrastructure through wired / wireless communication. V2X can be classified 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 through a PC5 interface and / or a Uu interface.

[0003] In addition, since a wider range of communication devices requires a greater communication capacity, the demand for enhanced mobile broadband communication compared to existing radio access technologies (RAT) is increasing. Therefore, services and user equipments that are sensitive to reliability and latency have been discussed. In addition, next-generation radio access technologies based on enhanced mobile broadband communication, massive machine type communication (MTC), ultra-reliable low-latency communication (URLLC), etc. can be referred to as new radio access technologies (RAT) or new radio (NR). Summary of the Invention

[0004] Technical Solution

[0005] According to an embodiment of the present disclosure, a method for a first device to perform wireless communication may be provided. For example, the method may include the following steps: obtaining information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); obtaining information about a channel occupancy time (COT) duration; selecting a second resource for transmitting the information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmitting the information about the COT duration to the second device based on the second resource.

[0006] According to an embodiment of the present disclosure, a first device for performing wireless communication can be provided. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions, when executed by the at least one processor, causing the first device to perform operations. For example, the operations may include: obtaining information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); obtaining information about a channel occupancy time (COT) duration; selecting a second resource for transmitting the information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmitting the information about the COT duration to the second device based on the second resource.

[0007] According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) can be provided. For example, the device may include: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions, when executed by the at least one processor, causing the first UE to perform operations. For example, the operations may include: obtaining information about a first resource reserved by a second UE based on decoding of sidelink control information (SCI); obtaining information about a channel occupancy time (COT) duration; selecting a second resource for transmitting the information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmitting the information about the COT duration to the second UE based on the second resource.

[0008] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions can be provided. For example, the instructions, when executed, may cause a first device to: obtain information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); obtain information about a channel occupancy time (COT) duration; select a second resource for transmitting the information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmit the information about the COT duration to the second device based on the second resource.

[0009] According to an embodiment of the present disclosure, a method for a second device to perform wireless communication may be provided. For example, the method may include the following steps: transmitting sidelink control information (SCI) including information for a first resource; receiving, based on a second resource, information for a channel occupancy time (COT) duration from a first device; performing channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration; and performing physical sidelink shared channel (PSSCH) transmission using the first resource based on a result of the channel sensing being idle, where the second resource may be a resource of N time slots before the first resource.

[0010] According to an embodiment of the present disclosure, a second device for performing wireless communication may be provided. For example, the second device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations when executed by the at least one processor. For example, the operations may include: transmitting sidelink control information (SCI) including information for a first resource; receiving, based on a second resource, information for a channel occupancy time (COT) duration from a first device; performing channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration; and performing physical sidelink shared channel (PSSCH) transmission using the first resource based on a result of the channel sensing being idle, where the second resource may be a resource of N time slots before the first resource. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shows a communication structure that may be provided in a 6G system according to an embodiment of the present disclosure.

[0012] Figure 2 Shows an electromagnetic spectrum according to an embodiment of the present disclosure.

[0013] Figure 3 Shows the structure of an NR system according to an embodiment of the present disclosure.

[0014] Figure 4 Shows a radio protocol architecture according to an embodiment of the present disclosure.

[0015] Figure 5 Shows the structure of a radio frame of NR according to an embodiment of the present disclosure.

[0016] Figure 6 Shows the slot structure of an NR frame according to an embodiment of the present disclosure.

[0017] Figure 7 Shows an example of a BWP according to an embodiment of the present disclosure.

[0018] Figure 8 Shows the process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication according to a transmission mode.

[0019] Figure 9 Shows three broadcast types according to an embodiment of the present disclosure.

[0020] Figure 10 Shows an example of a wireless communication system supporting an unlicensed band based on an embodiment of the present disclosure.

[0021] Figure 11 Shows a method of occupying resources in an unlicensed band based on an embodiment of the present disclosure.

[0022] Figure 12 Shows a case where multiple LBT-SBs are included in an unlicensed band based on an embodiment of the present disclosure.

[0023] Figure 13 Shows the CAP operation performed by a base station to transmit a downlink signal through an unlicensed band based on an embodiment of the present disclosure.

[0024] Figure 14 Shows a type 1 CAP operation performed by a UE to transmit an uplink signal based on an embodiment of the present disclosure.

[0025] Figure 15 Shows resource sharing information for a COT duration including resources reserved by another UE according to an embodiment of the present disclosure.

[0026] Figure 16 Shows the process in which a first device performs wireless communication according to an embodiment of the present disclosure.

[0027] Figure 17 Shows the process in which a second device performs wireless communication according to an embodiment of the present disclosure.

[0028] Figure 18 Shows communication system 1 based on an embodiment of the present disclosure.

[0029] Figure 19 Shows a wireless device according to an embodiment of the present disclosure.

[0030] Figure 20 Shows a signal processing circuit for transmitting a signal according to an embodiment of the present disclosure.

[0031] Figure 21 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0032] Figure 22 A handheld device according to an embodiment of the present disclosure is shown.

[0033] Figure 23 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. Detailed Embodiments

[0034] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B, or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0035] In the present disclosure, the slash ( / ) or comma used may mean "and / or". For example, "A / B" may mean "A and / or B". Thus, "A / B" may mean "only A", "only B", or "both A and B". For example, "A, B, C" may mean "A, B, or C".

[0036] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". Additionally, in the present disclosure, the expression "at least one of A or B" or "at least one of A and / or B" may be interpreted as "at least one of A and B".

[0037] Furthermore, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". Additionally, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0038] Furthermore, the parentheses used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean presenting "PDCCH" as an example of "control information". In other words, the "control information" in the present disclosure is not limited to "PDCCH", and "PDDCH" may be presented as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean presenting "PDCCH" as an example of "control information".

[0039] In the following description, "when, if, or in the case of" may be replaced with "based on".

[0040] The technical features described separately in one of the accompanying drawings in the present disclosure can be implemented separately or can be implemented simultaneously.

[0041] In the present disclosure, the high-layer parameters can be parameters configured, pre-configured, or predefined for the UE. For example, the base station or the network can send the high-layer parameters to the UE. For example, the high-layer parameters can be sent via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0042] The technologies described below 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), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as universal terrestrial radio access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for IEEE 802.16e-based systems. UTRA is part of the universal mobile telecommunications system (UMTS). The 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of the evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. Long Term Evolution-Advanced (LTE-A) is an evolution of LTE.

[0043] 5G NR is a subsequent technology to LTE-A corresponding to a new and full-fledged mobile communication system with characteristics such as high performance, low latency, high availability, etc. 5G NR can use resources of all available spectrums including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequencies (millimeter waves) above 24 GHz.

[0044] The 6G (wireless communication) system aims to (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) lower energy consumption for battery-less IoT devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can be embodied in four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and pervasive connectivity, and the 6G system can meet the requirements as shown in Table 1 below. In other words, Table 1 is an example of the requirements of the 6G system.

[0045] [Table 1]

[0046] Peak data rate per device 1 Tbps E2E latency 1 ms Maximum spectral efficiency 100 bps / Hz Mobility support Up to 1000 km / hr Satellite integration Fully AI Fully Autonomous vehicles Fully XR Fully Tactile communication Fully

[0047] The 6G system can have key factors such as eMBB (enhanced mobile broadband), URLLC (ultra-reliable low-latency communication), 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.

[0048] Figure 1 A communication structure that can be provided in a 6G system according to an embodiment of the present disclosure is shown. Figure 1 Embodiments can be combined with various embodiments of the present disclosure.

[0049] It is expected that the 6G system will have 50 times higher simultaneous radio connectivity than the 5G radio system. URLLC (a key feature of 5G) will become a more dominant technology in 6G communication by providing an end-to-end latency of less than 1 ms. In the 6G system, instead of the area spectral efficiency often used today, the volume spectral efficiency will be better. The 6G system will be able to provide very long battery life and advanced battery technologies for energy harvesting, and thus, in the 6G system, mobile devices will not need to be charged separately. In 6G, new network characteristics can be as follows.

[0050] - Satellite-integrated network: To provide global mobile populations, 6G is expected to be integrated with satellites. Integrating terrestrial, satellite, and airborne networks into a single wireless communication system is important for 6G.

[0051] - Connected intelligence: Different from previous generations of wireless communication systems, 6G is revolutionary, and the wireless evolution will be updated from "connecting things" to "connecting intelligence". AI can be applied to every step of the communication process (or every step of signal processing, as will be described later).

[0052] - Seamless integration of wireless information and energy transfer: The 6G wireless network will deliver electricity to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0053] - Ubiquitous super 3D connectivity: Super 3D connectivity will generate access network and core network functions to drones and very low Earth orbit satellites from 6G ubiquity.

[0054] Given the above new network characteristics of 6G, some common requirements can be as follows

[0055] - Small cell networks: The concept of small cell networks has been introduced in cellular systems to improve the received signal quality due to increased processing throughput, energy efficiency, and spectral efficiency. Therefore, small cell networks are a fundamental feature of 5G and beyond 5G (5GB) communication systems. Thus, the 6G communication system will also adopt the characteristics of small cell networks.

[0056] - Ultra-dense heterogeneous networks: Ultra-dense heterogeneous networks will be another important feature of the 6G communication system. A multi-layer network composed of heterogeneous networks will improve the overall QoS and reduce costs.

[0057] - High-capacity backhaul: Backhaul connections are characterized by high-capacity backhaul networks to support a large amount of traffic. High-speed optical fibers and free space optical (FSO) systems can be possible solutions to this problem.

[0058] - Radar technology integrated with mobile technology: High-precision positioning (or location-based services) through communication is one of the characteristics of the 6G wireless communication system. Therefore, radar systems will be integrated with the 6G network.

[0059] - Softwareization and virtualization: Softwareization and virtualization are two important features essential for the design process in 5GB networks to ensure flexibility, reconfigurability, and programmability. Additionally, billions of devices can be shared on a shared physical infrastructure.

[0060] The core implementation technologies for 6G systems are described below.

[0061] - Artificial Intelligence: The most important and latest technology to be introduced in the 6G system is AI. The 4G system does not involve AI. The 5G system will support partial or very limited AI. However, the 6G system will fully enable AI for automation. In 6G, the advancement of machine learning will create more intelligent networks for real-time communication. The introduction of AI in telecommunications can simplify and improve real-time data transmission. AI can use many analyses to determine the way to perform complex target operations, which means AI can improve efficiency and reduce processing latency. Time-consuming tasks such as handover, network selection, and resource scheduling can be completed immediately by using AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine communications. Additionally, AI can become fast communication in the brain-computer interface (BCI). The AI-based communication system can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-sustaining wireless networks, and machine learning.

[0062] - THz Communication (Terahertz Communication): The data rate can be increased by increasing the bandwidth. This can be achieved by using sub-THz communication with a wide bandwidth and applying advanced massive MIMO technology. THz waves (also known as submillimeter radiation) refer to the frequency band between 0.1 THz and 10 THz, where the corresponding wavelength is usually in the range of 0.03 mm to 3 mm. The 100 GHz - 300 GHz frequency band range (sub-THz band) is considered the main part of the THz band for cellular communication. Adding the sub-THz band to the millimeter-wave band increases the capacity of 6G cellular communication. The 300 GHz - 3 THz in the defined THz band is in the far-infrared (IR) band. The 300 GHz - 3 THz band is part of the optical band, but it is on the boundary of the optical band, just behind the RF band. Therefore, the 300 GHz - 3 THz band exhibits similarities with RF. Figure 2 An electromagnetic spectrum according to an embodiment of the present disclosure is shown. Figure 2 Embodiments can be combined with various embodiments of the present disclosure. The key features of THz communication include (i) a widely available bandwidth that supports very high data rates, and (ii) high path loss at high frequencies (for which high-directional antennas are indispensable). The narrow beamwidth generated by high-directional antennas reduces interference. The small wavelength of THz signals allows a larger number of antenna elements to be integrated into devices and BSs operating in this band. This enables the use of advanced adaptive array technologies that can overcome range limitations.

[0063] - Massive MIMO

[0064] - HBF, Holographic Beamforming

[0065] - Optical Wireless Technology

[0066] - FSO Backhaul Network

[0067] - Non-Terrestrial Network, NTN

[0068] - Quantum Communication

[0069] - Cell-Free Communication

[0070] - Integration of Wireless Information and Power Transfer

[0071] - Integration of Wireless Communication and Sensing

[0072] - Integrated Access and Backhaul Network

[0073] - Big Data Analytics

[0074] - Reconfigurable Intelligent Surface

[0075] - Metaverse

[0076] - Blockchain

[0077] - UAV, Drone: Unmanned Aerial Vehicles (UAVs) or drones will be an important part of 6G wireless communication. In most cases, UAV technology is used to provide high-speed wireless data connections. The BS entity is installed on the UAV to provide cellular connectivity. UAVs have specific characteristics not found in fixed BS infrastructures (e.g., easy deployment, strong line-of-sight links, and freedom of controlled mobility). During emergencies such as natural disasters, the deployment of ground communication infrastructure is economically unfeasible and sometimes cannot provide services in volatile environments. UAVs can easily handle these situations. UAVs will be a new paradigm in wireless communication. This technology contributes to the three basic requirements of wireless networks: eMBB, URLLC, and mMTC. UAVs can also support many other purposes such as enhanced network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, accident monitoring, etc. Therefore, UAV technology is considered one of the most important technologies for 6G communication.

[0078] -Autonomous driving: For perfect autonomous driving, vehicles must communicate with each other to notify each other of dangerous situations, or communicate with infrastructure such as parking lots and traffic lights to check information such as location and signal change time of parking information. Vehicle-to-Everything (V2X), a key element in building the autonomous driving infrastructure, is a technology that allows vehicles to communicate with various elements on the road and share information to perform autonomous driving (e.g., vehicle-to-vehicle (V2V) wireless communication and vehicle-to-infrastructure (V2I) wireless communication). To maximize the performance of autonomous driving and ensure high safety, fast transmission speed and low latency technology are necessary. Additionally, in the future, autonomous driving will go beyond delivering warning or guidance messages to the driver to actively intervene in vehicle operation and directly control the vehicle in dangerous situations, so the amount of information to be sent and received will be large, and 6G is expected to maximize autonomous driving with a faster transmission speed and lower latency than 5G.

[0079] For clarity, the description focuses on 5G NR, but the technical concept of one embodiment of the present disclosure is not limited thereto. Various embodiments of the present disclosure can also be applied to 6G communication systems.

[0080] Figure 3 The structure of an NR system based on an embodiment of the present disclosure is shown. Figure 3 Embodiments of can be combined with various embodiments of the present disclosure.

[0081] Referring to Figure 3 , the next-generation radio access network (NG-RAN) may include a BS20 that provides user plane and control plane protocol termination to the UE 10. For example, the BS20 may include a next-generation node B (gNB) and / or an evolved node B (eNB). For example, the UE 10 may be fixed or mobile and may be referred to by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to by other terms such as base transceiver system (BTS), access point (AP), etc.

[0082] Figure 3 Embodiments of illustrate only the case including a gNB. The BS20s may be interconnected via the Xn interface. The BS20s may be interconnected via the fifth-generation (5G) core network (5GC) and the NG interface. More specifically, the BS20 may be connected to the access and mobility management function (AMF) 30 via the NG-C interface and may be connected to the user plane function (UPF) 30 via the NG-U interface.

[0083] The radio interface protocol layers between the UE and the network can be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the well-known Open System Interconnection (OSI) model in a communication system. Among them, the physical (PHY) layer belonging to the first layer provides an information transmission service using physical channels, and the radio resource control (RRC) layer located in the third layer controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0084] Figure 4 Shows a radio protocol architecture according to an embodiment of the present disclosure. Figure 4 Embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) in shows a radio protocol stack for the user plane of Uu communication, and Figure 4 (b) in shows a radio protocol stack for the control plane of Uu communication. Figure 4 (c) in shows a radio protocol stack for the user plane of SL communication, and Figure 4 (d) in shows a radio protocol stack for the control plane of SL communication.

[0085] Referring to Figure 4 , the physical layer provides an information transfer service to the upper layer through physical channels. The physical layer is connected to the medium access control (MAC) layer, which is the upper layer of the physical layer, through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how data is transmitted through the radio interface and what characteristics of the data are transmitted.

[0086] Data is transferred through physical channels between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver). The physical channel can be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and the physical channel uses time and frequency as radio resources.

[0087] The MAC layer provides services to the radio link control (RLC) layer via a logical channel, which is the upper layer of the MAC layer. The MAC layer provides the function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides the function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides a data transmission service through logical channels.

[0088] The RLC layer performs concatenation, segmentation, and reassembly of radio link control service data units (RLC SDUs). To ensure different quality of service (QoS) required by radio bearers (RBs), the RLC layer provides three types of operation modes, namely, transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0089] The radio resource control (RRC) layer is defined only in the control plane. The RRC layer is used to control the logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of RBs. An RB is a logical path provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, RLC layer, packet data convergence protocol (PDCP) layer, and service data adaptation protocol (SDAP) layer) for data transfer between the UE and the network.

[0090] The functions of the packet data convergence protocol (PDCP) in the user plane include the transmission of user data, header compression, and encryption. The functions of the packet data convergence protocol (PDCP) in the control plane include the transmission of control plane data and encryption / integrity protection.

[0091] The service data adaptation protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs the mapping between quality of service (QoS) flows and data radio bearers (DRBs) and the QoS flow ID (QFI) marking in both DL packets and UL packets.

[0092] The configuration of an RB refers to the process of specifying radio protocol layer and channel attributes to provide a specific service and determining the corresponding detailed parameters and operation methods. An RB can then be classified into two types, namely, signaling radio bearer (SRB) and data radio bearer (DRB). An SRB is used as a path for sending RRC messages in the control plane, and a DRB is used as a path for sending user data in the user plane.

[0093] When an RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state; otherwise, the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTRIVE) state is additionally defined, and a UE in the RRC_INACTRIVE state can maintain its connection with the core network while releasing its connection with the BS.

[0094] The downlink transport channels for sending (or transmitting) data from the network to the UE include the broadcast channel (BCH) for sending system information and the downlink shared channel (SCH) for sending other user services or control messages. The services or control messages for downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transport channels for sending (or transmitting) data from the UE to the network include the random access channel (RACH) for sending initial control messages and the uplink shared channel (SCH) for sending other user services or control messages.

[0095] Examples of logical channels that belong to the higher layer of the transport channel and are mapped to the transport channel can include the broadcast control channel (BCCH), the paging control channel (PCCH), the common control channel (CCCH), the multicast control channel (MCCH), the multicast traffic channel (MTCH), etc.

[0096] Figure 5 The structure of the radio frame of NR according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of can be combined with various embodiments of the present disclosure.

[0097] Referring to Figure 5 , in NR, the radio frame can be used to perform uplink and downlink transmissions. The length of the radio frame is 10 ms and can be defined as being composed of two half-frames (HF). A half-frame can include five 1-ms sub-frames (SF). A sub-frame (SF) can be divided into one or more time slots, and the number of time slots within a sub-frame can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM(A) symbols according to the cyclic prefix (CP).

[0098] In the case of using normal CP, each time slot can include 14 symbols. In the case of using extended CP, each time slot can include 12 symbols. Herein, the symbols can include OFDM symbols (or CP-OFDM symbols) and single-carrier FDMA (SC-FDMA) symbols (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols).

[0099] Table 2 below shows the number of symbols per time slot (N slot symb ), the number of time slots per frame (N frame,μ slot ), and the number of time slots per sub-frame (N subframe,μ slot ) according to the SCS configuration (u) when using normal CP or extended CP.

[0100] [Table 2]

[0101]

[0102] In the NR system, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) among multiple cells integrated into a UE can be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., subframe, slot, or TTI) (collectively referred to as a time unit (TU) for simplicity) composed of the same number of symbols can be configured differently in the integrated cells.

[0103] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, in the case of an SCS of 15 kHz, a wide range of traditional cellular bands can be supported, and in the case of an SCS of 30 kHz / 60 kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. In the case of an SCS of 60 kHz or higher, a bandwidth greater than 24.25 GHz can be used to overcome phase noise.

[0104] NR bands can be defined as two different types of frequency ranges. The two different types of frequency ranges can be FR1 and FR2. The values of the frequency ranges can change (or vary), for example, the two different types of frequency ranges can be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean "the range below 6 GHz", and FR2 can mean "the range above 6 GHz", and can also be referred to as millimeter wave (mmW).

[0105] [Table 3]

[0106] Frequency range designation Corresponding frequency range Subcarrier spacing (SCS) FR1 450 MHz – 6000 MHz 15, 30, 60 kHz FR2 24250 MHz – 52600 MHz 60, 120, 240 kHz

[0107] As described above, the values of the frequency ranges in the NR system can change (or vary). For example, as shown in Table 4 below, FR1 can include bandwidths in the range of 410 MHz to 7125 MHz. More specifically, FR1 can include bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 can include unlicensed bands. The unlicensed bands can be used for various purposes, for example, the unlicensed bands are used for vehicle-specific communications (e.g., autonomous driving).

[0108] [Table 4]

[0109] Frequency range designation Corresponding frequency range Subcarrier spacing (SCS) FR1 410 MHz – 7125 MHz 15, 30, 60 kHz FR2 24250 MHz – 52600 MHz 60, 120, 240 kHz

[0110] Figure 6 The structure of a slot of an NR frame according to an embodiment of the present disclosure is shown. Figure 6The embodiments may be combined with various embodiments of the present disclosure.

[0111] Referring to Figure 6 , a time slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. However, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols. A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) may be defined as a plurality of consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) may be defined as a plurality of consecutive (physical) resource blocks ((P)RB) in the frequency domain, and the BWP may correspond to a parameter set (e.g., SCS, CP length, etc.).

[0112] A carrier may include up to N BWPs (e.g., 5 BWPs). Data communication may be performed via an active BWP. Each element may be referred to as a resource element (RE) in a resource grid, and one complex symbol may be mapped to each element.

[0113] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0114] The BWP may be a continuous set of physical resource blocks (PRB) within a given parameter set. The PRB may be selected from a continuous subset of common resource blocks (CRB) for a given parameter set on a given carrier.

[0115] For example, the BWP can be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the 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 physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an inactive DL BWP. For example, the UE may not transmit a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) outside the active UL BWP. For example, in the case of the downlink, the initial BWP can be given as a set of consecutive resource blocks (RBs) for the remaining minimum system information (RMSI) control resource set (CORESET) (configured by the physical broadcast channel (PBCH)). For example, in the case of the uplink, the initial BWP can be given by a system information block (SIB) for the random access procedure. For example, the default BWP can be configured by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP. For energy saving, if the UE cannot detect downlink control information (DCI) during a specified period, the UE can switch the active BWP of the UE to the default BWP.

[0116] In addition, a BWP can be defined for sidelink (SL). The same SL BWP can be used for transmission and reception. For example, a transmitting UE can transmit an SL channel or an SL signal on a specific BWP, and a receiving UE can receive an SL channel or an SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, the UE can receive the configuration for the SL BWP from the BS / network. For example, the UE can receive the configuration for the Uu BWP from the BS / network. The SL BWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For a UE in the RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0117] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of can be combined with various embodiments of the present disclosure. Assume that in Figure 7 the embodiment of, the number of BWPs is 3.

[0118] Referring to Figure 7, a Common Resource Block (CRB) can be a carrier resource block numbered from one end of a carrier frequency band to the other end. Additionally, a PRB can be a resource block numbered within each BWP. Point A can indicate a common reference point of the resource block grid.

[0119] A BWP can be configured by Point A, an offset (N start BWP ) relative to Point A, and a bandwidth (N size BWP ). For example, Point A can be an external reference point of the PRBs of a carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) is aligned at Point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and Point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0120] V2X or SL communication will be described hereinafter.

[0121] A Sidelink Synchronization Signal (SLSS) can include a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS) as SL-specific sequences. The PSSS can be referred to as the Sidelink Primary Synchronization Signal (S-PSS), and the SSSS can be referred to as the Sidelink Secondary Synchronization Signal (S-SSS). For example, an M sequence of length 127 can be used for the S-PSS, and a Gold sequence of length 127 can be used for the S-SSS. For example, a UE can use the S-PSS for initial signal detection and synchronization acquisition. For example, a UE can use the S-PSS and S-SSS for detailed synchronization acquisition and for the detection of synchronization signal IDs.

[0122] The Physical Sidelink Broadcast Channel (PSBCH) can be a (broadcast) channel for transmitting default (system) information that a UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to a resource pool, and the type of application related to SLSS, subframe offset, broadcast information, etc. For example, to evaluate the PSBCH performance, in NR V2X, the payload size of the PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0123] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL Synchronization Signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) in the carrier, and the transmission bandwidth may be within the preconfigured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SB). For example, the PSBCH may span 11 RBs. Additionally, the frequency position of the S-SSB may be preconfigured. Thus, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0124] Figure 8 A process of a UE performing V2X or SL communication based on a transmission mode according to an embodiment of the present disclosure is shown. Figure 8 Embodiments of may 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 ease of explanation, in LTE, the transmission mode may be referred to as the LTE transmission mode. In NR, the transmission mode may be referred to as the NR resource allocation mode.

[0125] For example, Figure 8 (a) in shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) in shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to conventional SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0126] For example, Figure 8 (b) in shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) in shows UE operations related to NR resource allocation mode 2.

[0127] Referring to Figure 8 (a) of, in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station may schedule sidelink resources to be used by the UE for sidelink transmission. For example, in step S600, the base station may send information related to the sidelink resources and / or information related to the UL resources to the first UE. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting sidelink HARQ feedback to the base station.

[0128] For example, the first UE may receive information related to dynamic grant (DG) resources and / or information related to configured grant (CG) resources from a base station. For example, the CG resources may include CG type 1 resources or CG type 2 resources. In the present disclosure, the DG resources may be resources configured / assigned by the base station to the first UE via downlink control information (DCI). In the present disclosure, the CG resources may be (periodic) resources configured / assigned by the base station to the first UE via DCI and / or RRC messages. 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 UE. 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 UE, and the base station may send DCI related to the activation or release of the CG resources to the first UE.

[0129] In step S810, the first UE may send a PSCCH (e.g., sidelink control information (SCI) or first-level SCI) to the second UE based on resource scheduling. In step S820, the first UE may send a PSSCH (e.g., second-level SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE via the PSFCH. In step S840, the first UE may send / report the HARQ feedback information to the base station via PUCCH or PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on the HARQ feedback information received from the second UE. For example, the HARQ feedback information reported to the base station may be information generated by the first UE based on pre-configured rules. 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.

[0130] Referring to Figure 8In (b) below, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE may determine the SL transmission resources within the 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 resource pools. For example, the UE may autonomously select or schedule the resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting the resources within the configured resource pool. For example, the UE may autonomously select the resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing may be performed on a sub-channel basis. For example, in step S810, the first UE that has already selected resources from the resource pool may send a PSCCH (e.g., sidelink control information (SCI) or first-level SCI) to the second UE by using the resources. In step S820, the first UE may send a PSSCH (e.g., second-level SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0131] Referring to Figure 8 In (a) or (b) below, for example, the first UE may send the SCI to the second UE via the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., 2-level SCI) to the second UE via the PSCCH and / or PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., 2-level SCI) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first SCI, the first-level SCI, or the first-level SCI format, and the SCI sent via the PSSCH may be referred to as the second SCI, the second SCI, the second-level SCI, or the second-level SCI format. For example, the first-level SCI format may include SCI format 1-A, and the second-level SCI format may include SCI format 2-A and / or SCI format 2-B.

[0132] Hereinafter, an example of SCI format 1-A will be described.

[0133] SCI format 1-A is used for the scheduling of the second-level SCI on the PSSCH and PSSCH.

[0134] The following information is sent by means of SCI format 1-A:

[0135] - Priority - 3 bits

[0136] - Frequency resource assignment - When the value of the higher-layer parameter sl-MaxNumPerReserve is configured to 2, for ceiling(log2 (N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, it is ceiling log 2 (N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0137] - Time resource assignment - When the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2, it is 5 bits; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, it is 9 bits

[0138] - Resource reservation period - If the higher layer parameter sl-MultiReserveResource is configured, it is ceiling(log 2 N rsv_period ) bits, where N rsv_period is the number of entries in the higher layer parameter sl-MultiReserveResource; otherwise, it is 0 bits

[0139] - DMRS mode - ceiling(log 2 N pattern ) bits, where N pattern is the number of DMRS modes configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0140] - Second-level SCI format - 2 bits as defined in Table 5

[0141] - Beta_offset indicator – 2 bits as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0142] - Number of DMRS ports - 1 bit as defined in Table 6

[0143] - Modulation and coding scheme - 5 bits

[0144] - Additional MCS table indicator - If one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table, it is 1 bit; if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table, it is 2 bits; otherwise, it is 0 bits

[0145] -PSFCH Overhead Indicator - 1 bit if the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bits

[0146] - Reserved – Number of bits as determined by the higher layer parameter sl-NumReservedBits, which is set to zero.

[0147] [Table 5]

[0148] Value of the second-level SCI format field Second-level SCI format 00 SCI format 2-A 01 SCI format 2-B 10 Reserved 11 Reserved

[0149] [Table 6]

[0150] Value of the DMRS port number field Antenna port 0 1000 1 1000 and 1001

[0151] In the following, an example of SCI format 2-A will be described.

[0152] SCI format 2-A is used to decode the PSSCH with HARQ operations when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0153] The following information is sent by means of SCI format 2-A:

[0154] - HARQ Process Number - 4 bits

[0155] - New Data Indicator - 1 bit

[0156] - Redundancy Version - 2 bits

[0157] - Source ID - 8 bits

[0158] - Destination ID - 16 bits

[0159] - HARQ Feedback Enable / Disable Indicator - 1 bit

[0160] - Broadcast Type Indicator - 2 bits as defined in Table 5

[0161] - CSI Request - 1 bit

[0162] [Table 7]

[0163] Value of the broadcast type indicator Broadcast type 00 Broadcast 01 Multicast when the HARQ-ACK information includes ACK or NACK 10 Unicast 11 Multicast when the HARQ-ACK information only includes NACK

[0164] In the following, an example of SCI format 2-B will be described.

[0165] When the HARQ-ACK information only includes NACK or when there is no HARQ-ACK information feedback, SCI format 2-B is used to decode the PSSCH using HARQ operations.

[0166] The following information is sent by means of SCI format 2-B:

[0167] - HARQ process number - 4 bits

[0168] - New data indicator - 1 bit

[0169] - Redundancy version - 2 bits

[0170] - Source ID - 8 bits

[0171] - Destination ID - 16 bits

[0172] - HARQ feedback enable / disable indicator - 1 bit

[0173] - Zone ID - 12 bits

[0174] - Communication range requirement - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0175] Refer to Figure 8 In (a) or (b) of, in step S830, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resource, and the second UE uses the PSFCH resource to send HARQ feedback to the first UE.

[0176] Refer to Figure 8 In (a) of, in step S840, the first UE may send SL HARQ feedback to the base station via the PUCCH and / or PUSCH.

[0177] Figure 9 Shows three broadcast types according to an embodiment of the present disclosure. Figure 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 9 In (a) of, shows broadcast-type SL communication, Figure 9 In (b) of, shows unicast-type SL communication, and Figure 9 In (c) of, shows multicast-type SL communication. In the case of unicast-type SL communication, the UE may perform one-to-one communication for another UE. In the case of multicast-type SL transmission, the UE may perform SL communication for one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communication may be replaced by SL multiple-cast communication, SL one-to-many communication, etc.

[0178] In the following text, a UE procedure for determining a subset of resources to be reported to the higher layer in PSSCH resource selection in sidelink resource allocation mode 2 will be described.

[0179] In resource allocation mode 2, the higher layer may request the UE to determine a subset of resources from which the higher layer will select resources for PSSCH / PSCCH transmission. To trigger this procedure, in slot n, the higher layer provides the following parameters for this PSSCH / PSCCH transmission.

[0180] - The resource pool for which resources are to be reported;

[0181] - L1 priority prio TX ;

[0182] - The remaining packet delay budget;

[0183] - The number of subchannels L for PSSCH / PSCCH transmission in the slot subCH ;

[0184] - Optionally, the resource reservation interval P rsvpTX , in milliseconds.

[0185] - If the higher layer requests the UE to determine a subset of resources from which the higher layer will select resources for PSSCH / PSCCH transmission as part of a re-evaluation or pre-emption procedure, the higher layer provides the set of resources (r 0 , r 1 , r 2 ,...) that may be subject to re-evaluation and the set of resources (r′ 0 , r′ 1 , r′ 2 ,...) that may be subject to pre-emption.

[0186] - Whether the subset of resources requested by the higher layer is determined before or after slot r i ″ - T 3 depends on the UE implementation, where r i ″ is the slot with the smallest slot index among (r 0 , r 1 , r 2 ,...) and (r′ 0 , r′ 1 , r′ 2 ,...), and T 3 is equal to T SL proc，1 , where T SL proc，1 is defined per slot, and where μ SL is the SCS configuration of the SLBWP,

[0187] The following high-layer parameters affect this process:

[0188] -sl-SelectionWindowList: For a given value of prio TX the internal parameter T 2min is set to the corresponding value from the high-layer parameter sl-SelectionWindowList.

[0189] -sl-Thres-RSRP-List: This high-layer parameter provides an RSRP threshold for each combination (p i , p j ), where p i is the value of the priority field in the received SCI format 1-A, and p j is the priority of the transmission of the UE that selects the resource; for a given invocation of this process, p j = prio TX .

[0190] -sl-RS-ForSensing selects whether the UE uses PSSCH-RSRP measurement or PSCCH-RSRP measurement.

[0191] -sl-ResourceReservePeriodList

[0192] -sl-SensingWindow: The internal parameter T 0 is defined as the number of time slots corresponding to sl-SensingWindow milliseconds

[0193] -sl-TxPercentageList: For a given prio TX the internal parameter X is defined as sl-TxPercentageListprio TX

[0194] -sl-PreemptionEnable: If sl-PreemptionEnable is set and if it is not equal to "enabled", then the internal parameter prio pre is set to the parameter sl-PreemptionEnable provided by the high layer.

[0195] The resource reservation interval P rsvp_TX (if provided) is converted from milliseconds to logical time slot units, resulting in P' rsvp_TX .

[0196] Notation:

[0197] (t′ SL 0 ,t′ SL 1 ,t′ SL 2 (, t′,...) can represent a set of time slots belonging to a sidelink resource pool.

[0198] For example, the UE can select a set of candidate resources (Sa) based on Table 8. For example, when resource selection (reselection) is triggered, the UE can select a set of candidate resources (Sa) based on Table 8. For example, when re-evaluation or preemption is triggered, the UE can select a set of candidate resources (Sa) based on Table 8.

[0199] [Table 8]

[0200]

[0201]

[0202] In addition, partial sensing can be supported for power saving of the UE. For example, in LTE SL or LTE V2X, the UE can perform partial sensing based on Table 9 and Table 10.

[0203] [Table 9]

[0204]

[0205] [Table 10]

[0206]

[0207] In addition, in the conventional unlicensed spectrum (NR-U), a communication method between the UE and the base station is supported in the unlicensed band. In addition, a mechanism for supporting communication in the unlicensed band between sidelink UEs is planned to be supported in Rel-18.

[0208] In the present disclosure, a channel can refer to a set of frequency-domain resources that perform listen-before-talk (LBT). In NR-U, a channel can refer to an LBT bandwidth of 20 MHz and can have the same meaning as a set of RBs. For example, a set of RBs can be defined in Section 7 of 3GPP TS38.214 V17.0.0.

[0209] In the present disclosure, channel occupancy (CO) can refer to the time-domain / frequency-domain resources obtained by the base station or the UE after successful LBT.

[0210] In the present disclosure, the Channel Occupancy Time (COT) may refer to the time-domain resource obtained by a base station or a UE after successful LBT. The base station (or UE) that obtains the CO may share the Channel Occupancy Time (COT) with a UE (or a base station), and this may be referred to as COT sharing. Depending on the initiating device, this may be referred to as gNB-initiated COT or UE-initiated COT.

[0211] In the following, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0212] Figure 10 An example of a wireless communication system supporting an unlicensed band based on an embodiment of the present disclosure is shown. For example, Figure 13 it may include an unlicensed spectrum (NR-U) wireless communication system. Figure 10 Embodiments of [the system] may be combined with various embodiments of the present disclosure.

[0213] In the following description, a cell operating in an authorized band (hereinafter, the L band) may be defined as an L cell, and the carrier of the L cell may be defined as a (DL / UL / SL) LCC. Additionally, a cell operating in an unlicensed band (hereinafter, the U band) may be defined as a U cell, and the carrier of the U cell may be defined as a (DL / UL / SL) UCC. The carrier / carrier frequency of a cell may refer to the operating frequency (e.g., the center frequency) of the cell. A cell / carrier (e.g., a CC) is generally referred to as a cell.

[0214] As Figure 10 shown in (a) of [the figure], when a base station and a UE transmit and receive signals on the LCC and UCC of carrier aggregation, the LCC and UCC may be respectively configured as a Primary CC (PCC) and a Secondary CC (SCC). As Figure 10 shown in (b) of [the figure], a base station and a UE may transmit and receive signals on one UCC or on multiple carrier-aggregated UCCs. In other words, a base station and a UE may transmit and receive signals only on the UCC without using any LCC. For independent operation, PRACH transmission, PUCCH transmission, PUSCH transmission, SRS transmission, etc. may be supported on a U cell.

[0215] In Figure 10 an embodiment of [the system], a base station may be replaced by a UE. In this case, for example, PSCCH transmission, PSSCH transmission, PSFCH transmission, S-SSB transmission, etc. may be supported on a U cell.

[0216] Unless otherwise specified, the following definitions apply to the following terms used in the present disclosure.

[0217] - Channel: A carrier or a part of a carrier consisting of a continuous set of RBs that perform a channel access procedure in a shared spectrum.

[0218] - Channel Access Procedure (CAP): A process that evaluates channel availability based on sensing before signal transmission to determine whether other communication nodes are using the channel. The basic sensing unit is a sensing time slot, where the duration T sl = 9 us. The base station or UE senses the channel during the sensing time slot duration. If the power detected within at least 4 us during the sensing time slot duration is less than the energy detection threshold X thresh , then the sensing time slot duration T sl is considered idle. Otherwise, the sensing time slot duration T sl = 9 us is considered busy. CAP can also be referred to as Listen Before Talk (LBT). For example, the Channel Access Procedure (CAP) can include LBT, and channel sensing can be performed to monitor the power of the channel during a specific time interval (channel sensing interval) of CAP.

[0219] - Channel Occupancy: The transmission of the base station / UE on the channel after the channel access procedure.

[0220] - Channel Occupancy Time (COT): The total time that the base station / UE sharing the channel occupancy and any base station / UE can perform transmission on the channel after the base station / UE executes the channel access procedure. In the case of determining COT, if the transmission gap is less than or equal to 25 us, the gap duration can be counted in COT. COT can be shared for transmission between the base station and the corresponding UE.

[0221] - DL Transmission Burst: A set of transmissions from the base station without any gap greater than 16 us. Transmissions from the base station separated by a gap of more than 16 us are considered separate DL transmission bursts. The base station can perform transmission after the gap without sensing channel availability within the DL transmission burst.

[0222] - UL or SL Transmission Burst: A set of transmissions from the UE without any gap greater than 16 us. Transmissions from the UE separated by a gap of more than 16 us are considered separate UL or SL transmission bursts. The UE can perform transmission after the gap without sensing channel availability within the UL or SL transmission burst.

[0223] - Discovery Burst: A DL transmission burst includes a set of signals and / or channels that are restricted within a window and associated with a duty cycle. In an LTE-based system, a discovery burst can be a transmission initiated by a base station, which includes PSS, SSS, and cell-specific RS (CRS), and also includes non-zero power CSI-RS. In an NR-based system, a discovery burst can be a transmission initiated by a base station, which at least includes an SS / PBCH block, and also includes a CORESET for scheduling a PDSCH carrying SIB1, the PDSCH carrying SIB1, and / or a PDCCH for the non-zero power CSI-RS.

[0224] Figure 11 Fig. shows a method of occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure. Figure 11 Embodiments of can be combined with various embodiments of the present disclosure.

[0225] Referring to Figure 11 , a communication node (e.g., a base station, a UE) in an unlicensed frequency band should determine whether other communication nodes are using the channel before signal transmission. To this end, a communication node in an unlicensed frequency band can perform a channel access procedure (CAP) to access the channel for transmission. The channel access procedure can be performed based on sensing. For example, a communication node can perform carrier sensing (CS) before transmitting a signal to check whether other communication nodes are performing signal transmission. When other communication nodes are not performing signal transmission, a clear channel assessment (CCA) is confirmed. If the CCA threshold (e.g., X Thresh ) is predefined or configured by a higher layer (e.g., RRC), the communication node can determine that the channel is busy when the detected channel energy is higher than the CCA threshold. Otherwise, the communication node can determine that the channel is idle. If it is determined that the channel is idle, the communication node can start signal transmission in the unlicensed frequency band. CAP can be replaced by LBT. For example, the channel access procedure (CAP) can include LBT, and channel sensing can be performed to monitor the power of the channel during a specific time interval (channel sensing interval) of the CAP.

[0226] Table 11 shows an example of a channel access procedure (CAP) supported in NR-U.

[0227] [Table 11]

[0228]

[0229] Referring to Table 11, the LBT types or CAPs for DL / UL / SL transmissions can be defined. However, Table 11 is only an example, and new types or CAPs can be defined in a similar manner. For example, Type 1 (also known as Cat-4 LBT) can be a channel access procedure based on random backoff. For example, in the case of Cat-4, the contention window can be changed. For example, Type 2 can be performed in the case of COT sharing within the COT obtained by the base station (gNB) or UE.

[0230] Hereinafter, the LBT-subband (SB) (or set of RBs) will be described.

[0231] In a wireless communication system supporting an unlicensed band, a cell (or carrier (e.g., CC)) or BWP configured for a UE can have a wideband that has a larger bandwidth (BW) than that in conventional LTE. However, the BW for which CCA based on independent LBT operation is required may be restricted according to regulations. A subband (SB) that performs LBT individually is defined as an LBT-SB. Then, a wideband cell / BWP can include multiple LBT-SBs. The set of RBs included in the LBT-SB can be configured by higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one or more LBT-SBs can be included in a cell / BWP.

[0232] Figure 12 A case where multiple LBT-SBs are included in an unlicensed band based on an embodiment of the present disclosure is shown. Figure 12 Embodiments of can be combined with various embodiments of the present disclosure.

[0233] Referring to Figure 12 , multiple LBT-SBs can be included in the BWP of a cell (or carrier). The LBT-SB can have, for example, a 20 MHz band. The LBT-SB can include multiple consecutive (P) RBs in the frequency domain and thus can be referred to as a set of (P) RBs. Although not shown, a guard band (GB) can be inserted between the LBT-SBs. Therefore, the BWP can be configured in the form of {LBT-SB#0 (RB set#0) + GB#0 + LBT-SB#1 (RB set#1 + GB#1) + ··· + LBT-SB#(K - 1) (RB set (#K - 1))}. For convenience, the LBT-SB / RB index can be configured / defined in ascending order from the lowest frequency to the highest frequency.

[0234] Hereinafter, the channel access priority class (CAPC) will be described.

[0235] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0236] - For the padding buffer status report (BSR) and the recommended bitrate MAC CE, fixed to the lowest priority;

[0237] - For SRB0, SRB1, SRB3, and other MAC CE, fixed to the highest priority;

[0238] - For SRB2 and DRB, configured by the base station.

[0239] When selecting the CAPC of the DRB, the base station considers the fairness between other traffic types and transmissions while taking into account the 5QI of all QoS flows multiplexed to the corresponding DRB. Table 12 shows which CAPC should be used for the standardized 5QI (i.e., the CAPC to be used for a given QoS flow). For the standardized 5QI, the CAPC is defined as shown in the following table, and for non-standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0240] [Table 12]

[0241]

[0242] Hereinafter, a method for transmitting a downlink signal through an unlicensed band will be described. For example, the method for transmitting a downlink signal through an unlicensed band can be applied to the method for transmitting a sidelink signal through an unlicensed band.

[0243] The base station can perform one of the following channel access procedures (e.g., CAP) for downlink signal transmission in the unlicensed band.

[0244] (1) Type 1 downlink (DL) CAP method

[0245] In Type 1 DL CAP, the length of the duration spanned by the sensed time slots sensed as idle before transmission can be random. Type 1 DL CAP can be applied to the following transmissions:

[0246] - Transmissions initiated by the base station include (i) a unicast PDSCH with user plane data or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0247] - Transmissions initiated by the base station include (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0248] Figure 13 Shows the CAP operation performed by the base station based on an embodiment of the present disclosure to transmit a downlink signal through an unlicensed band.Figure 13 The implementation manners can be combined with various implementation manners of the present disclosure.

[0249] Referring to Figure 13 , the base station can sense whether the channel is idle for a sensing delay duration T d of the time slot duration. Then, if the counter N is zero, the base station can perform transmission (S134). In this case, the base station can adjust the counter N by sensing the channel within an additional sensing time slot duration according to the following steps:

[0250] Step 1) (S120) The base station sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, proceed to step 4.

[0251] Step 2) (S140) If N > 0 and the base station determines to decrease the counter, the base station sets N to N - 1 (N = N - 1).

[0252] Step 3) (S150) The base station senses the channel within the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0253] Step 4) (S130) If N = 0 (Y), the base station terminates the CAP (S132). Otherwise (N), proceed to step 2.

[0254] Step 5) (S160) The base station senses the channel until a busy sensing time slot is detected within the additional delay duration T d or all time slots of the additional delay duration T d are detected as idle.

[0255] Step 6) (S170) If the channel is sensed as idle (Y) within all time slot durations of the additional delay duration T d , proceed to step 4. Otherwise (N), proceed to step 5.

[0256] Table 13 shows that m p , the minimum contention window (CW), the maximum CW, the maximum channel occupancy time (MCOT), and the allowed CW size applied to the CAP vary according to the channel access priority class.

[0257] [Table 13]

[0258]

[0259] Referring to Table 13, the contention window size (CWS), maximum COT value, etc. can be defined for each CAPC. For example, T d can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0260] The delay duration T d is configured in the following order: the duration T f (16 us)+m p the continuous sensing time slot duration T sl (9 us). T f includes the sensing time slot duration T sl .

[0261] Satisfies the following relationship: CW min,p <=CW p <=CW max,p . CW p can be configured by CW p =CW min,p and updated (CW size update) based on the HARQ-ACK feedback (e.g., the ratio of ACK or NACK) for the previous DL burst (e.g., PDSCH) before step 1. For example, CW p can be initialized to CW min,p . Alternatively, CW p can be increased to the next higher allowed value or remain unchanged.

[0262] (2) Type 2 downlink (DL) CAP method

[0263] In type 2 DL CAP, the length of the duration spanned by the sensing time slots sensed as idle before transmission can be determined. Type 2 DL CAP is classified as type 2A / 2B / 2C DL CAP.

[0264] Type 2A DL CAP can be applied to the following transmissions. In type 2A DL CAP, the base station can perform transmission immediately after the channel has been sensed as idle for at least the sensing duration T short_dl =25 us. Here, T short_dl includes the duration T f (=16 us) and one sensing time slot duration immediately following the duration T f where the duration Tf Includes a sensing time slot at its start.

[0265] - Transmissions initiated by the base station, including (i) discovery bursts only or (ii) discovery bursts multiplexed with non - unicast information, or

[0266] - Transmissions from the base station after a 25 - us gap from the UE's transmission within shared channel occupancy.

[0267] Type 2B DL CAP applies to transmissions performed by the base station after a 16 - us gap from the UE's transmission within shared channel occupancy time. In Type 2B DL CAP, the base station can perform a transmission immediately after the channel is sensed idle within T f = 16 us. T f Includes a sensing time slot within 9 us from the end of the duration. Type 2C DL CAP applies to transmissions performed by the base station after up to 16 us from the UE's transmission within shared channel occupancy time. In Type 2C DL CAP, the base station does not perform channel sensing before performing a transmission.

[0268] Hereinafter, a method for transmitting an uplink signal through an unlicensed band will be described. For example, the method for transmitting an uplink signal through an unlicensed band can be applied to the method for transmitting a sidelink signal through an unlicensed band.

[0269] The UE can perform Type 1 CAP or Type 2 CAP for UL signal transmission in the unlicensed band. Generally, the UE can perform the CAP (e.g., Type 1 or Type 2) configured by the base station for UL signal transmission. For example, UL grants (e.g., DCI format 0_0 and DCI format 0_1) scheduling PUSCH transmissions can include CAP type indication information for the UE.

[0270] (1) Type 1 uplink (UL) CAP method

[0271] In Type 1 UL CAP, the length of the duration spanned by the sensing time slot sensed idle before transmission is random. Type 1 UL CAP can be applied to the following transmissions.

[0272] - PUSCH / SRS transmissions scheduled and / or configured by the base station

[0273] - PUCCH transmissions scheduled and / or configured by the base station

[0274] - Transmissions related to the random access process (RAP)

[0275] Figure 14 Shows a Type 1 CAP operation performed by a UE based on an embodiment of the present disclosure to transmit an uplink signal.Figure 14 The implementation manners can be combined with various implementation manners of the present disclosure.

[0276] Referring to Figure 14 , the UE can sense whether the channel is idle within the sensing time slot duration of the delay duration T d . Then, if the counter N is zero, the UE can perform transmission (S234). In this case, the UE can adjust the counter N by sensing the channel within an additional sensing time slot duration according to the following steps:

[0277] Step 1) (S220) The UE sets N to N init (N = N init ), where N init is a random number uniformly distributed between 0 and CW p . Then, proceed to step 4.

[0278] Step 2) (S240) If N > 0 and the UE determines to decrease the counter, the UE sets N to N - 1 (N = N - 1).

[0279] Step 3) (S250) The UE senses the channel within the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0280] Step 4) (S230) If N = 0 (Y), the UE terminates the CAP (S132). Otherwise (N), proceed to step 2.

[0281] Step 5) (S260) The UE senses the channel until a busy sensing time slot is detected within the additional delay duration T d or all time slots of the additional delay duration T d are detected as idle.

[0282] Step 6) (S270) If the channel is sensed as idle (Y) within all time slot durations of the additional delay duration T d , proceed to step 4. Otherwise (N), proceed to step 5.

[0283] Table 14 shows that m p , the minimum CW, the maximum CW, the maximum channel occupancy time (MCOT), and the allowed CW size applied to the CAP vary according to the channel access priority class.

[0284] [Table 14]

[0285]

[0286] Referring to Table 14, the contention window size (CWS), maximum COT value, etc. can be defined for each CAPC. For example, T d can be equal to T f +m p *T sl (T d = T f +m p *T sl ).

[0287] The delay duration T d is configured in the following order: the duration T f (16 us) + m p The continuous sensing time slot duration T sl (9 us). T f includes the sensing time slot duration T sl .

[0288] Satisfies the following relationship: CW min,p <= CW p <= CW max,p . CW p can be configured by CW p = CW min,p and updated (CW size update) based on the explicit / implicit reception response for the previous UL burst (e.g., PUSCH) before step 1. For example, CW p can be initialized to CW min,p . Alternatively, CW p can be increased to the next higher allowed value or remain unchanged.

[0289] (2) Type 2 Uplink (UL) CAP Method

[0290] In Type 2 UL CAP, the length of the duration spanned by the sensing time slots sensed as idle before transmission can be determined. Type 2 UL CAP is classified into Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the UE can perform transmission immediately after the channel has been sensed as idle for at least the sensing duration T short_dl = 25 us. Here, T short_dl includes the duration T f (= 16 us) and one sensing time slot duration immediately following the duration T f . In Type 2A UL CAP, T f includes a sensing time slot at its start. In Type 2B UL CAP, the UE can perform transmission when the channel has been sensed as idle for the sensing duration T fPerform transmission immediately after being sensed as idle within 16 μs. In Type 2B UL CAP, T f includes a sensing time slot within 9 μs from the end of the duration. In Type 2C UL CAP, the UE does not perform channel sensing before performing transmission.

[0291] For example, according to Type 1 LBT-based NR-U operation, a UE having uplink data to send can select a CAPC for the 5QI mapped to the data, and the UE can perform NR-U operation by applying the parameters of the corresponding CAPC (e.g., minimum contention window size, maximum contention window size, m p etc.). For example, the UE can select a backoff counter (BC) after selecting a random value between the minimum CW and the maximum CW mapped to the CAPC. In this case, for example, the BC can be a positive integer less than or equal to the random value. If the channel is idle, the UE sensing the channel decrements the BC by 1. If the BC becomes zero and the UE detects that the channel is idle at time T d (T d = T f + m p * T sl ), then the UE can attempt to send data by occupying the channel. For example, T sl (= 9 microseconds) is a basic sensing unit or sensing time slot, and can include a measurement duration of at least 4 microseconds. For example, the first 9 microseconds of T f (= 16 microseconds) can be configured as T sl .

[0292] For example, according to Type 2 LBT-based NR-U operation, the UE can send data by performing Type 2 LBT (e.g., Type 2A LBT, Type 2B LBT, or Type 2C LBT) within the COT.

[0293] For example, Type 2A (also known as Cat-2 LBT (one shot LBT) or single shot LBT) can be a 25-microsecond one shot LBT. In this case, transmission can be started immediately after idle sensing for at least a 25-microsecond gap. Type 2A can be used to initiate the transmission of SSB and non-unicast DL information. That is, the UE can sense the channel within the COT for 25 microseconds, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0294] For example, Type 2B can be LBT once every 16 microseconds. In this case, transmission can start immediately after the idle sensing reaches a 16-microsecond gap. That is to say, the UE can sense the channel within the COT for 16 microseconds, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0295] For example, in the case of Type 2C (also known as Cat-1 LBT or No LBT), LBT may not be performed. In this case, transmission can start immediately after a gap of up to 16 microseconds, and the channel may not be sensed before transmission. The duration of the transmission can be up to 584 microseconds. The UE can attempt to transmit after 16 microseconds without sensing, and the UE can perform the transmission for up to 584 microseconds.

[0296] In the sidelink unlicensed band, the UE can perform channel access operations based on Listen Before Talk (LBT). Before the UE accesses the channel in the unlicensed band, the UE should check whether the channel to be accessed is idle (for example, the state where the UE does not occupy the channel, the state where the UE can access the corresponding channel and send data) or busy (for example, the state where the channel is occupied and data transmission / reception is performed on the corresponding channel, and the UE attempting to access the channel cannot send data when the channel is busy). That is to say, the operation for the UE to check whether the channel is idle or busy can be referred to as Clear Channel Assessment (CCA), and the UE can check whether the channel is idle or busy within the CCA duration.

[0297] In addition, in future systems, the UE can perform sidelink transmission and / or reception operations in the unlicensed band. For operations in the unlicensed band, according to band-specific regulations or requirements, before the UE's transmission, there can be a channel sensing operation (such as energy detection / measurement) for the channel to be used. As a result of the channel sensing, only when it is determined that the channel or set of RBs to be used is idle (for example, if the measured energy is less than or equal to or greater than a specific threshold), the UE can perform transmission in the unlicensed band, and if it is determined that the channel or set of RBs to be used is busy according to the result of the channel sensing (for example, if the measured energy is greater than or equal to or greater than a specific threshold), the UE can cancel all or part of the transmission in the unlicensed band.

[0298] In addition, in the operation of the unlicensed band, the UE can omit or simplify the channel sensing operation (i.e., make the channel sensing interval relatively small) within a specific time interval after transmission within a specific period, or in contrast, after a specific time interval after transmission, the UE can decide whether to send after performing the normal channel sensing operation.

[0299] On the other hand, in the transmission in the unlicensed band, according to regulations or requirements, the time interval and / or the size of the frequency occupancy area and / or the power spectral density (PSD) of the signal / channel transmitted by the UE can be respectively greater than or equal to a specific level.

[0300] On the other hand, in the unlicensed band, to simplify channel sensing, it can be notified that it occupies the channel obtained through initial general channel sensing within a specific time period through channel occupancy time (COT) interval information, and the length of the COT duration can be configured to have different maximum values according to the priority of the service or data packet or the channel access priority class (CAPC).

[0301] On the one hand, the base station can share the obtained COT duration through the channel sensing in the form of DCI transmission, and the UE can perform a specific (indicated) channel sensing type and / or CP extension within the COT duration based on the DCI information received from the base station. On the other hand, the UE can share the COT duration it ensures through channel sensing with the base station that is the destination of the UE's UL transmission, and can provide relevant information through UL via CG-UCI. In the above cases, the base station can perform simplified channel sensing within the COT duration shared by the UE.

[0302] In the case of SL communication, there is a case where the base station indicates to the UE to use resources for SL transmission through DCI or RRC signaling (for example, mode 1 RA operation), and there is a case where the UE performs SL transmission and reception through the sensing operation between UEs without the assistance of the base station (for example, mode 2 RA operation).

[0303] On the other hand, for channel access type 1 that can be used independently of the channel occupancy time (COT) configuration, the procedures for DL transmission shown in Tables 15 and 16 and the procedures for UL transmission shown in Tables 17 and 18 are performed.

[0304] In the present disclosure, channel access can be mutually replaced / substituted by channel sensing.

[0305] [Table 15]

[0306]

[0307] [Table 16]

[0308]

[0309] [Table 17]

[0310]

[0311]

[0312] [Table 18]

[0313]

[0314] On the other hand, within the Channel Occupancy Time (COT), a simplified Channel Access Type 2 can be used before transmission, and the procedures for DL transmission as shown in Table 19 and the procedures for UL transmission as shown in Table 20 are executed.

[0315] [Table 19]

[0316]

[0317] [Table 20]

[0318]

[0319] According to an embodiment of the present disclosure, Type 2A SL channel access can be performed in the same manner as Type 2A DL and / or UL channel access, with a sensing interval of T_short_sl = 25 us and a T_f = 16 us interval immediately following the sensing interval consisting of one sensing time slot, where T_f includes the sensing time slot at the beginning. For basic idle determination, the DL or UL scheme can also be used.

[0320] According to an embodiment of the present disclosure, Type 2B SL channel access can be performed in the same manner as Type 2B DL and / or UL channel access, where the sensing interval T_f = 16 us, and T_f includes the sensing time slot at the end of the 9 us interval. For basic idle determination, the DL or UL scheme can also be used.

[0321] According to an embodiment of the present disclosure, Type 2C SL channel access can be performed in the same manner as Type 2C DL and / or UL channel access so that channel sensing is not performed. Instead, the time interval for SL transmission can be up to 584 us.

[0322] According to an embodiment of the present disclosure, Type 1 SL channel access is performed in the same manner as Type 1 DL and / or UL channel access, where: i) a random integer value N is derived based on the contention window size corresponding to the priority class, ii) if the channel sensing result within the delay duration of T_d corresponding to the priority class is idle, the counter value is decremented to N - 1 in units of T_sl when idle; and iii) if the counter value is zero, the UE can occupy the set of RBs or channels subject to channel sensing.

[0323] However, if some of the channel sensing results for the above T_sl interval are determined to be idle, the counter value can be maintained and channel sensing can continue until the channel sensing result in units of a delay duration of size T_d becomes idle again. Above, the delay duration of length T_d can be in the form of m_p consecutive T_sl after T_f = 16 us, where m_p is a value determined according to the priority class p and can be the time interval for performing channel sensing with T_sl = 9 us.

[0324] According to one embodiment of the present disclosure, when the UE has accessed and occupied a channel via a type 1 SL channel and the UE is not ready to send a sidelink transmission, the UE can immediately configure a delay duration of length T_d and a sensing interval of length T_sl before preparing to send the sidelink transmission, and if both are idle, the UE can immediately perform the sidelink transmission. Here, if any of them is busy, the UE can perform type 1 SL channel access again.

[0325] For example, if it is difficult to perform a sidelink transmission at the end of channel sensing (e.g., if the channel sensing ends after the start of the sidelink transmission), the UE can reselect the sidelink transmission resource. For example, the reselected resource can be selected considering the end time of the channel sensing and / or the length of the remaining sensing interval. For example, the remaining sensing interval can be a value derived by assuming that the channel sensing is all idle.

[0326] On the other hand, the sidelink UE may not be able to perform both the receiving operation and the sending operation simultaneously. For example, during the time interval when the UE is performing a sidelink transmission and / or during the transmit / receive switching interval, the UE may not be able to perform the channel sensing operation.

[0327] For example, the UE can expect that the channel sensing interval does not overlap with the time region restricted for reception (due to the UE's transmission). For example, the UE can (re)adjust or (re)select the counter value for the channel sensing operation to avoid the overlap between the reception-restricted time region and the channel sensing interval.

[0328] For example, when the channel sensing interval overlaps with the time region restricted for reception (due to the UE's transmission), the UE can extend the channel sensing interval. For example, the UE can extend the channel sensing interval by the amount of time during which the UE cannot perform channel sensing in the channel sensing interval.

[0329] For example, the UE may maintain a counter value during a time interval when the UE is unable to perform channel sensing in a channel sensing interval. For example, the UE may determine that the channel sensing result for the time interval when the UE is unable to perform channel sensing in the channel sensing interval is idle, and / or may determine and / or perform channel sensing within a sensing time slot interval after the time interval when the UE is unable to perform channel sensing in the channel sensing interval according to the counter value. For example, the UE may determine that the channel sensing result for the time interval when the UE is unable to perform channel sensing in the channel sensing interval is idle, and may decrement the counter value by a channel sensing time slot interval during the time interval when the UE is unable to perform channel sensing in the channel sensing interval.

[0330] For example, the UE may determine the channel sensing result as idle for the time interval when the UE is unable to perform channel sensing in the channel sensing interval, and may perform a process of determining whether the channel is busy or idle during an additional delay duration (DEFER DURATION) after the time interval when the UE is unable to perform channel sensing. For example, if the channel is determined to be busy during the delay duration, additional channel sensing may be performed during the delay duration, and / or if the channel is determined to be idle, channel sensing may be performed again for the sensing time slot period according to the counter value.

[0331] For example, if the channel sensing interval overlaps with a time interval in which reception is restricted (due to UE transmission), the UE may (re)start the channel sensing operation after the time interval when the UE is unable to perform channel sensing. For example, as described above, the UE may reset the counter value for the channel sensing operation back to the (previously selected) initial value. For example, as described above, the UE may (randomly) select the counter value for the channel sensing operation again. For example, the counter value may be configured to be greater than and / or equal to the counter value previously selected by the UE. For example, the (restart) counter value may be configured to be less than and / or equal to the counter value previously selected by the UE. For example, the (restart) counter value may be randomly selected between a value between the previously selected counter value and zero. For example, this may reduce the time interval during which channel sensing can be performed, thereby increasing the probability of channel access.

[0332] According to one embodiment of the present disclosure, the situation where the UE is unable to perform a reception operation may include, for example, when the UE is performing UL transmission, and / or when the UE is performing SL transmission, and / or when the reception performance is less than or equal to a specific level due to interference, etc.

[0333] In addition, the UE may transmit PSCCH / PSSCH and / or PSFCH in the same time slot, where the PSCCH / PSSCH and PSFCH may have different CAPC values and / or SL priority values and / or target receiving UEs. In the above cases, depending on the success or failure of LBT for the previous PSCCH / PSSCH, there may not be enough channel sensing time for subsequent PSFCH transmission.

[0334] For example, if the UE attempts to transmit PSCCH / PSSCH and / or PSFCH in a single time slot, and / or if the CAPC values and / or SL priority values for the PSCCH / PSSCH and PSFCH are different, and / or if the channel sensing result for PSCCH / PSSCH transmission is busy, and / or if the CAPC value for PSFCH is equal to or less than the CAPC value for PSCCH / PSSCH, the UE may determine whether to start channel sensing for the CAPC of the PSFCH and / or whether to maintain the channel sensing process in the operation for the CAPC of the PSCCH / PSSCH and / or whether to continue the channel sensing process in the operation for the PSCCH / PSSCH, where the CAPC value is converted to that of the PSFCH in the middle. For example, selecting at least one of the above operations may be determined by the implementation of the UE and / or may be determined based on the probability that the channel sensing result is determined to be idle and / or may be performed based on the (remaining) channel sensing interval length (e.g., such that a shorter channel sensing interval length is selected) (when it is determined to be idle only within the sensing time slot and / or delay duration).

[0335] For example, if the UE attempts to transmit PSCCH / PSSCH and / or PSFCH in a single time slot, and / or if the CAPC values and / or SL priority values for the PSCCH / PSSCH and PSFCH are different, and / or if the channel sensing result for PSCCH / PSSCH transmission is busy, and / or if the CAPC value for PSFCH is greater than the CAPC value for PSCCH / PSSCH, the UE may stop the channel sensing process in the operation for the PSCCH / PSSCH and / or start channel sensing for the CAPC of the PSFCH.

[0336] For example, if the UE attempts to transmit PSCCH / PSSCH and / or PSFCH in a single time slot, and / or if the CAPC value and / or SL priority value for PSCCH / PSSCH and PSFCH are different, and / or if the channel sensing result for PSCCH / PSSCH transmission is idle, and / or if the CAPC value for PSFCH is greater than the CAPC value for PSCCH / PSSCH, and / or if the time interval between PSCCH / PSSCH and PSFCH is equal to or greater than or exceeds a specific level (e.g., 16 us), and / or if a type 1 channel access procedure is configured or indicated for PSFCH, the UE may omit PSCCH / PSSCH transmission (for PSFCH transmission attempt) and / or omit PSFCH transmission.

[0337] For example, the above cases may be applied differently according to the SL priority for PSFCH and / or the priority for PSCCH / PSSCH and / or the CAPC value for PSFCH and / or the channel sensing interval length for PSFCH. For example, if the SL priority value for PSFCH is less than and / or equal to the SL priority value for PSCCH / PSSCH, and / or if the SL priority value for PSFCH is less than a (pre)-configured threshold, and / or if the CAPC value for PSFCH is greater than or equal to a specific level, the PSCCH / PSSCH transmission may be omitted for the PSFCH transmission attempt.

[0338] For example, if the UE attempts to transmit PSCCH / PSSCH and / or PSFCH in a single time slot, and / or if the CAPC value and / or SL priority value for PSCCH / PSSCH and PSFCH are different, and / or if the channel sensing result for PSCCH / PSSCH transmission is idle, and / or if the CAPC value for PSFCH is greater than the CAPC value for PSCCH / PSSCH, and / or if the time interval between PSCCH / PSSCH and PSFCH is equal to or less than or below a specific level (e.g., 16 microseconds), and / or if a type 1 channel access procedure is configured or indicated for PSFCH, the UE may perform PSFCH transmission without a channel sensing operation and / or according to a type 2 series of channel access procedures.

[0339] For example, if the UE attempts to transmit PSCCH / PSSCH and / or PSFCH in a single time slot, and / or the COT sharing condition is not satisfied for PSCCH / PSSCH transmission (e.g., in terms of the CAPC value and / or the target receiving UE), and / or the COT sharing condition is satisfied for PSFCH transmission, and / or the UE has successfully transmitted PSCCH / PSSCH based on the type 1 channel access procedure, and / or the time interval between PSCCH / PSSCH and PSFCH is equal to or less than or lower than a specific level (e.g., 16 microseconds), and / or the CAPC value of PSFCH is equal to or less than the CAPC value of PSCCH / PSSCH, then the UE may omit the channel sensing for PSFCH transmission, or may attempt to transmit based on the type 2 series of channel access procedures.

[0340] For example, the type 2 series of channel access procedures may be type 2A, or may be determined based on the time gap between the (different) SL channels received by the UE from the COT initiation UE and PSFCH. For example, even when the type 1 channel access procedure is configured / determined or indicated for PSFCH transmission, the procedure may include using the type 2 series or omitting the channel sensing.

[0341] For example, when the COT is shared by the UE with another UE, if there are PSCCH / PSSCH and / or PSFCH targeted at the COT initiation UE before and / or after the PSCCH / PSSCH targeted at the UE that is not the COT initiation UE for PSCCH / PSSCH and / or PSFCH transmission, and / or if an actual transmission has occurred, and / or if the time interval between the PSCCH / PSSCH transmission targeted at a UE other than the COT initiation UE and the SL channel targeted at the COT initiation UE is equal to or less than a specific level (e.g., 16 microseconds), then COT sharing may be allowed and / or a transmission attempt may be performed based on the type 2 series of channel access procedures and / or the channel sensing operation may be omitted.

[0342] For example, the above-described embodiments may be extended for application regardless of the SL channel type, that is, even between PSCCH / PSSCH transmissions, if some of the transmissions can share the COT and some transmissions cannot share the COT, the above-described embodiments may be extended and applied. For example, the above-described embodiments may be extended and applied between S-SSB / PSFCH transmissions and / or between PSCCH / PSSCH / S-SSB.

[0343] For example, when (re)selecting transmission resources, the UE can (additionally) avoid resources within a specific interval before the (already selected) transmission reserved resources of the UE and / or transmission resources that are the reserved resources and / or reserved resources of another UE derived from the received SCI within the same RB set and / or resources within a specific interval after the reserved resources and / or reserved resources within the same RB set.

[0344] For example, the specific time interval before the reserved resources can be a value, expected value, or actual value related to the channel sensing interval for the reserved resources. For example, the specific time interval after the reserved resources can be a value, expected value, or actual value related to the channel sensing interval for the transmission of the UE.

[0345] For example, the specific time interval before the reserved resources can be configured individually (pre-) for each CAPC value and / or SL priority value and / or congestion control level and / or resource pool for the reserved resources and / or RB set to which the reserved resources belong and / or (current or maximum or minimum) CWS for the reserved resources or transmission resources. For example, the specific time interval can be different and / or configured individually (pre-) according to whether the reserved resources are the reserved resources of the UE that (re)selects the resources or the reserved resources of another UE. For example, the specific time interval can be determined by the UE implementation method.

[0346] For example, the specific time interval after the reserved resources can be configured individually (pre-) for each CAPC value and / or SL priority value and / or congestion control level and / or resource pool for the transmission of the UE and / or RB set to which the transmission resources belong and / or (current or maximum or minimum) CWS for the transmission resources. For example, the specific time interval can be different and / or configured individually (pre-) according to whether the reserved resources are the reserved resources of the UE that (re)selects the resources or the reserved resources of another UE. For example, the specific time interval can be determined by the UE implementation method.

[0347] For example, the specific time interval before the reserved resources can be a value derived based on the maximum value and / or minimum value and / or average value of the contention window size according to the CAPC for the reserved resources and / or sidelink priority value and / or based on the current value of the UE.

[0348] For example, the specific time interval after the reserved resources can be based on the maximum value and / or minimum value and / or average value of the contention window size according to the CAPC for the transmission resources of the UE and / or sidelink priority value and / or based on the current value of the UE.

[0349] On the other hand, during the resource (re)selection process, the UE may exclude from the unmonitored time slots the resource candidates that overlap with the potential reserved resources derived from all or some of the (pre)configured resource reservation period values in the resource pool, where SCI monitoring has not been performed by the UE's transmission within the sensing window of the available resource set in the unmonitored time slots. For example, the UE may generate the available resource set and / or select the transmission resources so as to further avoid the potential reserved resources derived from the unmonitored time slots and the reference channel sensing interval for the reserved resources (e.g., values (pre)configured and / or selected by the UE implementation), i.e., when the UE selects the transmission resources before the potential reserved resources, there may be an additional time gap.

[0350] For example, the UE may generate the available resource set and / or select the transmission resources so that when the UE selects the transmission resources for a later time point from the potential reserved resources derived from the above unmonitored time slots, the reference channel sensing interval is safe for the UE's transmission, i.e., when the UE selects the transmission resources after the potential reserved resources, there may be an additional time gap.

[0351] According to one embodiment of the present disclosure, if the size of the available resource set is less than or equal to or less than a specific level (the ratio of the number of candidate resources in the available resource set to the total number of candidate resources in the resource selection window is less than or equal to or less than the (pre)configured threshold), the UE may cancel the resource exclusion based on the reference channel sensing interval before the detected reserved resources and / or the reference channel sensing interval for the UE's transmission after the detected reserved resources and / or the reference channel sensing interval before the potential reserved resources for the unmonitored time slots and / or the reference channel sensing interval for the UE's transmission after the potential reserved resources for the unmonitored time slots. For example, the resource exclusion cancellation may be performed sequentially according to the amount of the available resource set, and / or in the above case, the UE may preferentially cancel the resource exclusion by the reference channel sensing interval corresponding to the unmonitored time slots.

[0352] According to one embodiment of the present disclosure, for S-SSB transmission, the UE may use the COT of another UE independent of its own destination UE. For example, when the UE (re)selects the transmission resources for S-SSB transmission, when selecting the earlier transmission resources before the S-SSB transmission, the UE may preferentially use the resources in the time slot (or the earlier N time slots) immediately before the S-SSB transmission resources.

[0353] According to one embodiment of the present disclosure, in the case of COT sharing information, a specific amount of time may be required before the COT responds to the UE's use of the COT sharing information. Considering this, the following embodiments are possible.

[0354] For example, the selection of a resource immediately before a reserved resource or an S-SSB resource (or N time slots before it) as a transmission resource can be limited to the case where the UE selects a resource including N consecutive previous time slots including the immediately preceding time slot as the transmission resource.

[0355] Alternatively, for example, the selection of a resource immediately before a reserved resource or an S-SSB resource (or a resource N time slots before it) as a transmission resource can be limited to the case where the UE selects the immediately preceding time slot as the transmission resource.

[0356] Alternatively, for example, the selection of a resource immediately before a reserved resource or an S-SSB resource (or a resource N time slots before it) as a transmission resource can be limited to the case where the UE selects a resource N time slots before it as the transmission resource.

[0357] For example, the value of N can be a value determined based on the start time point of the shared COT for the UE to share the COT for the reserved resource or S-SSB transmission, and / or can be determined as the processing time for completing the decoding of the COT sharing information. In other words, if the UE cannot send / provide the COT sharing information to the reserved resource UE or S-SSB from a time point N time slots before the reserved resource or S-SSB resource, the sidelink transmission from the resource in the time slot immediately before the reserved resource or S-SSB resource (or the resource N time slots before) can be omitted and / or resource reselection for the time slot immediately before the reserved resource (or the resource N time slots before) can be performed.

[0358] Figure 15 Resource sharing information for a COT duration including a resource reserved by another UE according to an embodiment of the present disclosure is shown. Figure 15 The embodiments can be combined with various embodiments of the present disclosure.

[0359] Referring to Figure 15 , in step S1510, the first device can reserve a first resource that it will use for transmission via an SCI (regardless of the COT). For example, the transmission target of the SCI can be the second device or another device. In step S1520, the second device can decode the SCI to obtain information about the first resource. Here, the second device can generate (or be configured with or obtain) a COT including the first resource so that the first resource can be used based on channel sensing for type 2 CAP. To this end, in step S1530, the second device can send information about the COT duration to the first device via a second resource.

[0360] Here, for example, the second resource may be a resource that is at least N time slots earlier than the first resource. This is because due to performing channel sensing for type 1 CAP (or due to processing time) for the transmission based on the first resource, the first device may not be able to receive the COT information shared from the second resource. That is, for example, considering the channel sensing interval of the first device, N can be determined to be longer than the channel sensing interval of the first device. In step S1540, since the first device has successfully received information within the COT duration, it can perform the first resource-based transmission based on the COT duration using channel sensing for type 2 CAP.

[0361] For example, if the UE cannot obtain a specific time interval (e.g., N time slots) between sidelink resources, the UE may reselect the preselected resources and / or transmission resources. For example, if the UE cannot obtain a specific time interval between sidelink resources, the UE may discard the preselected resources and / or transmission resources. For example, the resources to be reselected or discarded among the preselected resources and transmission resources may be determined based on the SL priority value and / or the CAPC value, and / or it may be a resource with a larger SL priority value and / or a resource with a larger CAPC and / or a resource with a smaller CAPC.

[0362] For example, if the CAPC value is small, the expected channel sensing window is shorter, which may have the advantage of ensuring more transmission opportunities. For example, if the CAPC value is large, it may have the effect of increasing the transmission opportunities for more important transmissions. For example, the resources to be reselected or discarded among the above preselected resources and transmission resources may be determined based on the time ordering of the resources, and / or it may be a resource that is later in time, and / or the UE may determine the resources to be reselected (with more margin) based on the packet delay budget (PDB) corresponding to each resource.

[0363] For example, if or when the UE determines that the channel sensing interval length is not safe within the time gap of the transmission resources after the reserved resources, the UE may perform resource reselection for the transmission resources. In other words, it can be pre-determined whether there is enough time for the channel sensing operation before the value of the counter in the channel sensing operation reaches the maximum value, so that resource reselection can be performed in advance.

[0364] For example, if the sidelink resources are indicated / configured by the base station, the base station can limit the CAPC value(s) and / or the maximum CAPC value that the sidelink resources can use through DCI and / or RRC configuration.

[0365] According to one embodiment of the present disclosure, when a resource is (re)-selected, operations for further avoiding the actual or expected value of the channel sensing interval length may vary according to the priority value and / or CAPC value of the transmission resource for the UE and / or the priority value and / or CAPC value of the pre-selected reserved resource for the UE and / or the priority value and / or CAPC value of the reserved resource detected (of another UE) for the UE. For example, the operation may be restricted to be performed when the priority value of the resource (re)-selection for the UE is less than or equal to or lower than a (pre)-configured threshold and / or the priority value of the reserved resource is less than or equal to or lower than a (pre)-configured threshold.

[0366] For example, if the priority value of the resource (re)-selection of the UE is greater than or equal to or greater than the priority value of the reserved resource, and / or the CAPC value of the resource (re)-selection of the UE is less than the CAPC value of the reserved resource, an operation for avoiding resources within a specific interval (within the same RB set) before the reserved resource may be performed.

[0367] For example, if the priority value of the resource (re)-selection of the UE is less than or equal to or less than the priority value of the reserved resource, and / or the CAPC value of the resource (re)-selection of the UE is greater than the CAPC value of the reserved resource, an operation for avoiding resources within a specific interval (within the same RB set) before the reserved resource may be performed.

[0368] According to one embodiment of the present disclosure, the reserved resource may be a transmission resource for the same TB or different TBs of the UE and / or a reserved resource of another UE obtained from the received PSCCH / PSSCH. In addition, the reserved resource may have been transmitted or may still be before actual transmission.

[0369] The various methods described in the present disclosure may be applied differently according to the channel access type.

[0370] The various methods described in the present disclosure may be applied differently according to how the channel sensing interval overlaps with the time region where the reception of the UE is restricted (e.g., early, middle, or late in the channel sensing interval).

[0371] According to one embodiment of the present disclosure, the reference duration may be the interval from the start of the channel occupancy on the COT ensured by the UE (for sidelink communication) and / or the COT ensured by the base station (for sidelink communication) until the end of the first time slot (in the first time slot, actual specific sidelink transmission is performed for all allocated resources for sidelink transmission) or until the end of the first transmission burst (the first transmission burst includes actual specific sidelink transmission for all allocated resources for sidelink transmission) or until the earlier time point among the above end time points.

[0372] For example, in the above, a specific sidelink transmission may be a PSCCH / PSSCH transmission for unicast and / or multicast and / or a PSCCH / PSSCH enabling SL HARQ-ACK feedback. For example, when a COT is initiated, the length of the reference duration may be (pre)-configured per resource pool and / or per SL priority value and / or priority level of the SL transmission of each UE.

[0373] Depending on whether the COT duration is initiated by the UE or the base station, various schemes described in the present disclosure may be applied differently.

[0374] Depending on whether the COT duration is initiated by the transmitting UE or a third-party UE, various schemes described in the present disclosure may be applied differently.

[0375] Various schemes described in the present disclosure may be applied differently per unicast session (group) and / or per broadcast type and / or per transmission priority value and / or per SL transmission enabling / disabling SL HARQ-ACK feedback and / or per SL HARQ-ACK feedback option.

[0376] According to one embodiment of the present disclosure, the operation of resetting the value of CW_p to the corresponding minimum value may be replaced and applied as decrementing the value of CW_p to a previously allowable value.

[0377] According to one embodiment of the present disclosure, various schemes described in the present disclosure may be applied differently according to the channel access type indicated by another UE.

[0378] According to the transmission within or outside the channel occupancy time (COT), various embodiments of the present disclosure may be applied in any combination above. According to the form of the COT (e.g., semi-static or time-varying), various embodiments of the present disclosure may be applied in different combinations above. According to different carriers, with or without protection between RB sets, or according to regulations, various embodiments of the present disclosure may be applied differently in the form of the combinations above.

[0379] Various schemes described in the present disclosure may be applied differently per priority class or SL priority value.

[0380] Various schemes described in the present disclosure may be applied differently per SL channel. According to the type of information included in the SL channel, various methods described in the present disclosure may be applied differently.

[0381] The various embodiments of the present disclosure may be different and / or pre-configured as follows: per resource pool and / or per transmission and / or for each of outside and / or inside the resource pool and / or per QoS parameter and / or per CAPC and / or per SL priority and / or for each of inside or outside the COT (when initiating a COT) and / or the transmission order within the MCSt and / or per SL channel type and / or RB set and / or per SL BWP and / or per SL carrier and / or congestion control level and / or per transmit operation or receive operation and / or per transmission power level and / or transmission start time point and / or the type of channel access procedure for the transmission and / or LBT failure rate and / or whether it is a COT initiator UE or a COT responder UE or other UE and / or per broadcast type and / or whether SL HARQ-ACK feedback is enabled and / or per HARQ-ACK feedback option and / or per same information for the TB or transmission attempt count.

[0382] For example, according to an embodiment of the present disclosure, the pre-configuration may be performed as follows: per resource pool and / or per transmission and / or for each of outside and / or inside the resource pool and / or per QoS parameter and / or per CAPC and / or per SL priority and / or for each of inside or outside the COT (when initiating a COT) and / or the transmission order within the MCSt and / or per SL channel type and / or RB set and / or per SL BWP and / or per SL carrier and / or congestion control level and / or per transmit operation or receive operation and / or per transmission power level and / or transmission start time point and / or the type of channel access procedure for the transmission and / or LBT failure rate and / or whether it is a COT initiator UE or a COT responder UE or other UE and / or per broadcast type and / or whether SL HARQ-ACK feedback is enabled and / or per HARQ-ACK feedback option and / or per same information for the TB or transmission attempt count.

[0383] For example, the proposed method may be applied to the apparatus described below. First, the processor 202 of the receiving UE may configure at least one BWP. Then, the processor 202 of the receiving UE may control the transceiver 206 of the receiving UE to receive sidelink-related physical channels and / or sidelink-related reference signals from the transmitting UE on at least one BWP.

[0384] To ensure a transmission opportunity in the unlicensed band, an LBT operation may be performed. After performing channel sensing on a channel sensing window at a time point earlier than the length of the channel sensing window from the time point of the transmission resource, transmission may be performed only if the result is idle. For example, the LBT operation may be included in the channel sensing for type 1 (or type 2) CAP.

[0385] For example, if the interval between transmission resources is 16 microseconds or less, the LBT operation may not be performed, and it may be determined whether to perform transmission based on the LBT result of the immediately preceding resource, that is, in the case of burst transmission, only the LBT for the first resource is performed. The type 1 LBT operation may be performed during the COT duration, where relatively short channel sensing-based transmission is possible, and the UE may receive or generate the COT duration and share the COT duration with other UEs.

[0386] According to an embodiment of the present disclosure, when a UE detects a resource reserved by another UE, the resource it selects to share the COT information including the resource with the device may necessarily include a resource that is N time slots earlier than the resource. Alternatively, for example, in the above case, the UE may select a resource that is N time slots earlier. In this way, the UE receiving the COT sharing can have enough time to receive and process the COT to ensure that the COT sharing operation is smoothly performed.

[0387] Figure 16 A process of a first device performing wireless communication according to an embodiment of the present disclosure is shown. Figure 16 The embodiments of can be combined with various embodiments of the present disclosure.

[0388] Referring to Figure 16 , at step S1610, the first device may obtain information about a first resource reserved by a second device based on decoding of sidelink control information (SCI). At step S1620, the first device may obtain information about the channel occupancy time (COT) duration. At step S1630, the first device may select a second resource for transmitting the information about the COT duration. For example, the second resource may be a resource that is N time slots before the first resource. At step S1640, the first device may transmit the information about the COT duration to the second device based on the second resource.

[0389] For example, the N time slots may be physical time slots.

[0390] For example, the information about the COT duration may be obtained through configuration.

[0391] For example, the step of obtaining the information about the COT duration may include: generating the information about the COT duration.

[0392] For example, the transmission based on the first resource may be a transmission for the first device.

[0393] For example, additionally, the first device may determine N.

[0394] For example, N may be determined based on the decoding processing time of the information about the COT duration.

[0395] For example, N may be determined based on a priority value related to the first resource.

[0396] For example, the COT duration may be used by the second device.

[0397] For example, additionally, the first device may send sidelink control information (SCI) for scheduling the physical sidelink shared channel (PSSCH) based on a second resource via a physical sidelink control channel (PSCCH); and send a media access control (MAC) protocol data unit (PDU) via the PSSCH based on the second resource.

[0398] For example, obtaining information regarding the COT duration may be performed based on a priority value related to the MAC PDU being less than or equal to a threshold.

[0399] For example, transmission of information regarding the COT duration may be performed based on a priority value related to the MAC PDU being less than or equal to a threshold.

[0400] For example, the first resource may be a resource for the transmission of a sidelink synchronization signal block (S-SSB).

[0401] The above-described embodiments may be applied to various devices described below. First, the processor 102 of the first device 100 may obtain information regarding a first resource reserved by the second device 200 based on decoding of sidelink control information (SCI). And, the processor 102 of the first device 100 may obtain information regarding the channel occupancy time (COT) duration. And, the processor 102 of the first device 100 may select a second resource for sending information regarding the COT duration. For example, the second resource may be a resource N time slots before the first resource. And, the processor 102 of the first device 100 may send information regarding the COT duration to the second device 200 based on the second resource.

[0402] According to an embodiment of the present disclosure, a first device for performing wireless communication may be provided. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations when executed by the at least one processor. For example, the operations may include: obtaining information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); obtaining information about a channel occupancy time (COT) duration; selecting a second resource for transmitting the information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmitting the information about the COT duration to the second device based on the second resource.

[0403] For example, the N time slots may be physical time slots.

[0404] For example, the information about the COT duration may be obtained by configuration.

[0405] For example, the step of obtaining the information about the COT duration may include: generating the information about the COT duration.

[0406] For example, the transmission based on the first resource may be a transmission for the first device.

[0407] For example, additionally, the operations may further include: determining N.

[0408] For example, N may be determined based on the decoding processing time of the information about the COT duration.

[0409] For example, N may be determined based on a priority value associated with the first resource.

[0410] For example, the COT duration may be used by the second device.

[0411] For example, additionally, the operations may further include: transmitting sidelink control information (SCI) for scheduling a physical sidelink shared channel (PSSCH) based on the second resource through a physical sidelink control channel (PSCCH); and transmitting a media access control (MAC) protocol data unit (PDU) based on the second resource through the PSSCH.

[0412] For example, obtaining the information about the COT duration may be performed based on a priority value associated with the MAC PDU being less than or equal to a threshold.

[0413] For example, the transmission of the information about the COT duration may be performed based on a priority value associated with the MAC PDU being less than or equal to a threshold.

[0414] For example, the first resource may be a resource for the transmission of a sidelink synchronization signal block (S-SSB).

[0415] According to one embodiment of the present disclosure, an apparatus adapted to control a first user equipment (UE) may be provided. For example, the apparatus may include: at least one processor; and at least one memory operatively connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first UE to perform operations. For example, the operations may include: obtaining information about a first resource reserved by a second UE based on decoding of sidelink control information (SCI); obtaining information about a channel occupancy time (COT) duration; selecting a second resource for transmitting information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmitting information about the COT duration to the second UE based on the second resource.

[0416] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, when executed, may cause a first device to: obtain information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); obtain information about a channel occupancy time (COT) duration; select a second resource for transmitting information about the COT duration, where the second resource may be a resource N time slots before the first resource; and transmit information about the COT duration to the second device based on the second resource.

[0417] Figure 17 A process of a second device performing wireless communication according to one embodiment of the present disclosure is shown. Figure 17 Embodiments of may be combined with various embodiments of the present disclosure.

[0418] Referring to Figure 17 , in step S1710, the second device may transmit sidelink control information (SCI) including information about the first resource. In step S1720, the second device may receive information about a channel occupancy time (COT) duration from the first device based on the second resource. In step S1730, the second device may perform channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration. In step S1740, the second device may perform a physical sidelink shared channel (PSSCH) transmission for idle use of the first resource based on the result of the channel sensing. For example, the second resource may be a resource N time slots before the first resource.

[0419] For example, the PSSCH transmission may be a transmission for the first device.

[0420] The above-described embodiments can be applied to various devices described below. First, the processor 202 of the second device 200 can control the transceiver 206 to send sidelink control information (SCI) including information for a first resource. Also, the processor 202 of the second device 200 can control the transceiver 206 to receive information for a channel occupancy time (COT) duration from the first device 100 based on a second resource. Also, the processor 202 of the second device 200 can perform channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration. Also, the processor 202 of the second device 200 can control the transceiver 206 to perform a physical sidelink shared channel (PSSCH) transmission using the first resource based on the result of the channel sensing being idle. For example, the second resource can be the resource of the N time slots before the first resource.

[0421] According to an embodiment of the present disclosure, a second device for performing wireless communication can be proposed. For example, the second device can include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations when executed by the at least one processor. For example, the operations can include: sending sidelink control information (SCI) including information for a first resource; receiving information for a channel occupancy time (COT) duration from a first device based on a second resource; performing channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration; and performing a physical sidelink shared channel (PSSCH) transmission using the first resource based on the result of the channel sensing being idle, where the second resource can be the resource of the N time slots before the first resource.

[0422] For example, the PSSCH transmission can be a transmission to the first device.

[0423] Various embodiments of the present disclosure can be combined with each other.

[0424] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0425] Various descriptions, functions, processes, proposals, methods, and / or operation flows of the present disclosure described in this document can be applied to, but are not limited to, various fields that require wireless communication / connection (e.g., 5G) between devices.

[0426] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, unless otherwise described, the same reference numerals can represent the same or corresponding hardware blocks, software blocks, or functional blocks.

[0427] Figure 18Communication system 1 according to an embodiment of the present disclosure is shown. Figure 18 Embodiments of Figure 18 may be combined with various embodiments of the present disclosure.

[0428] Referring to Figure 18 , communication system 1 applying various embodiments of the present disclosure includes a wireless device, a base station (BS), and a network. Herein, the wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or Long Term Evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, without limitation, a robot 100a, vehicles (100b-1, 100b-2), an extended reality (XR) device (100c), a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Herein, the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a TV, a smart phone, a computer, a wearable device, a home appliance device, a digital sign, a vehicle, a robot, etc. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include sensors and smart meters. For example, the BS and the network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node with respect to other wireless devices.

[0429] Here, in addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may also include NarrowBand Internet of Things (NB-IoT) for low-power communication. In this case, for example, the NB-IoT technology may be an example of a Low-Power Wide-Area Network (LPWAN) technology and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN and may be referred to by various names including Enhanced Machine-Type Communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE Non-Bandwidth Limited (Non-BL), 5) LTE-MTC, 6) LTE Machine-Type Communication, and / or 7) LTE M, not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, Low-Power Wide-Area Network (LPWAN), and ZigBee considering low-power communication, not limited to the above names. As an example, the ZigBee technology may generate a Personal Area Network (PAN) related to small / low-power digital communication based on various standards including IEEE 802.15.4, etc., and may be referred to by various names.

[0430] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., Vehicle-to-Vehicle (V2V) / Vehicle-to-Everything (V2X) communication). IoT devices (e.g., sensors) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0431] Wireless communication / connection 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access and backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connections 150a and 150b. For example, the wireless communication / connections 150a and 150b can send / receive signals through various physical channels. To this end, at least a part of the various configuration information configuration processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for sending / receiving radio signals can be performed based on various proposals of the present disclosure.

[0432] Figure 19 A wireless device according to an embodiment of the present disclosure is shown. Figure 19 Embodiments of can be combined with various embodiments of the present disclosure.

[0433] Referring to Figure 19 , the first wireless device 100 and the second wireless device 200 can send radio signals through various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} can correspond to Figure 18 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in

[0434] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas (antenna units) 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then transmit radio signals including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive radio signals including second information / signals through the transceivers 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operations of the (one or more) processors 102. For example, the (one or more) memories 104 may store software codes including commands for executing part or all of the processes controlled by the (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. Here, the (one or more) processors 102 and the (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 106 may be connected to the (one or more) processors 102, and transmit and / or receive radio signals through the (one or more) antennas (antenna units) 108. Each transceiver 106 may include a transmitter and / or a receiver. The (one or more) transceivers 106 may be used interchangeably with the (one or more) radio frequency (RF) units. In this disclosure, a wireless device may represent a communication modem / circuit / chip.

[0435] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit radio signals including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive radio signals including fourth information / signals through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, the (one or more) memories 204 may store software codes including commands for executing a part or all of the processing controlled by the (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. Here, the (one or more) processors 202 and the (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 206 may be connected to the (one or more) processors 202, and transmit and / or receive radio signals through the (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The (one or more) transceivers 206 may be used interchangeably with the (one or more) RF units. In the present disclosure, the wireless device may represent a communication modem / circuit / chip.

[0436] Next, the hardware components of wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by one or more processors 102 and 202, but are not limited to this. For example, one or more processors 102 and 202 may implement one or more layers (such as functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document. One or more processors 102 and 202 may generate signals (such as baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (such as baseband signals) from one or more transceivers 106 and 206, and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document.

[0437] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field-programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. The firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204, and thus be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0438] One or more memories 104 and 204 may be connected to one or more processors 102 and 202, and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be constituted by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 through various techniques such as wired or wireless connections.

[0439] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the methods and / or operation procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may send and receive radio signals. For example, one or more processors 102 and 202 may execute controls such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute controls such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0440] Figure 20 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Figure 20 Embodiments of may be combined with various embodiments of the present disclosure.

[0441] Referring to Figure 20 , the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Operations / functions of may be performed, not limited to Figure 20 the processors (102, 202) and / or transceivers (106, 206) of Figure 19 It may be throughFigure 19 implemented by the processors (102, 202) and / or transceivers (106, 206) Figure 20 of the hardware components. For example, Figure 19 the processors (102, 202) can implement blocks 1010 to 1060. Alternatively, Figure 19 the processors (102, 202) can implement blocks 1010 to 1050, and Figure 19 the transceivers (106, 206) can implement block 1060.

[0442] It can convert the codeword into a radio signal via Figure 20 the signal processing circuit 1000. Here, the codeword is a coded bit sequence of an information block. The information block can include transport blocks (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal can be sent through various physical channels (e.g., PUSCH and PDSCH).

[0443] Specifically, the codeword can be converted by the scrambler 1010 into a scrambled bit sequence. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated by the modulator 1020 into a sequence of modulation symbols. The modulation scheme can include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex sequence of modulation symbols can be mapped by the layer mapper 1030 to one or more transmission layers. The modulation symbols of each transmission layer can be mapped (precoded) by the precoder 1040 to the corresponding antenna port(s). The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 by the N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. The precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) on the complex modulation symbols. Alternatively, the precoder 1040 can perform precoding without performing transform precoding.

[0444] The resource mapper 1050 can map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and multiple subcarriers in the frequency domain. The signal generator 1060 can generate a radio signal from the mapped modulation symbols, and the generated radio signal can be sent to other devices through each antenna. For this purpose, the signal generator 1060 can include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an upconverter.

[0445] The signal processing procedure for signals received in a wireless device can be configured in a manner opposite to that of Figure 20 the signal processing procedure (1010 - 1060). For example, a wireless device (e.g., Figure 19 100, 200) can receive radio signals from the outside through an antenna port / transceiver. The received radio signals can be converted into baseband signals by a signal restorer. To this end, the signal restorer can include a frequency down-converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signals can be restored into codewords through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codewords can be restored into the original information blocks through decoding. Therefore, the signal processing circuit (not illustrated) for receiving signals can include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0446] Figure 21 Another example of a wireless device according to an embodiment of the present disclosure is shown. The wireless device can be implemented in various forms according to use cases / services (refer to Figure 18 ). Figure 21 The embodiments of

[0447] can be combined with various embodiments of the present disclosure. Figure 21 Referring to Figure 19 , the wireless devices (100, 200) can correspond to the wireless devices (100, 200) of Figure 19 and can be configured by various elements, components, units / parts, and / or modules. For example, each of the wireless devices (100, 200) can include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit can include a communication circuit 112 and one or more transceivers 114. For example, the communication circuit 112 can include Figure 19One or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional component 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 programs / codes / commands / information stored in the memory unit 130. The control unit 120 can send the information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0448] The additional component 140 can be configured in various ways according to the type of the wireless device. For example, the additional component 140 can include at least one of a power unit / battery, an input / output (I / O) unit, a driving unit, and a computing unit. The wireless device can be implemented in forms including but not limited to: a robot ( Figure 18 of 100a), a vehicle ( Figure 18 of 100b-1 and 100b-2), an XR device ( Figure 18 of 100c), a handheld device ( Figure 18 of 100d), a household appliance ( Figure 18 of 100e), an IoT device ( Figure 18 of 100f), a digital broadcast terminal, a holographic device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device ( Figure 18 of 400), a BS ( Figure 18 of 200), a network node, etc. According to the use case / service, the wireless device can be used in a mobile or fixed place.

[0449] In Figure 21In this case, various elements, components, units / sections, and / or modules in the wireless devices (100, 200) can all be connected to each other through a wired interface, or at least some of them can be wirelessly connected through the communication unit 110. For example, in each of the wireless devices (100, 200), the control unit 120 and the communication unit 110 can be connected by a wired connection, and the control unit 120 and the first unit (e.g., 130, 140) can be wirelessly connected through the communication unit 110. Each element, component, unit / section, and / or module within the wireless devices (100, 200) can also include one or more elements. For example, the control unit 120 can be constructed by a set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory unit 130 can be constructed by 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.

[0450] Hereinafter, examples of implementing Figure 21 will be described in detail with reference to the accompanying drawings.

[0451] Figure 22 A handheld device according to an embodiment of the present disclosure is shown. The handheld device can include a smart phone, a smart tablet, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device can 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). Figure 22 Embodiments of

[0452] Referring to Figure 22 , the handheld device 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I / O unit 140c. The antenna unit 108 can be configured as part of the communication unit 110. Blocks 110 to 130 / 140a to 140c respectively correspond to Figure 21 blocks 110 to 130 / 140 of

[0453] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from other wireless devices or a BS. The control unit 120 can perform various operations by controlling the components of the handheld device 100. The control unit 120 can include an application processor (AP). The memory unit 130 can store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 can store input / output data / information. The power supply unit 140a can supply power to the handheld device 100 and includes a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support the connection of the handheld device 100 to other external devices. The interface unit 140b can include various ports for connecting to external devices (e.g., audio I / O ports and video I / O ports). The I / O unit 140c can input or output video information / signals, audio information / signals, data, and / or information input by the user. The I / O unit 140c can include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0454] For example, in the case of data communication, the I / O unit 140c can acquire information / signals input by the user (e.g., touch, text, voice, image, or video), and the acquired information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into a radio signal and directly send the converted radio signal to other wireless devices or to the BS. The communication unit 110 can receive a radio signal from other wireless devices or the BS and then restore the received radio signal to the original information / signals. The restored information / signals can be stored in the memory unit 130 and can be output through the I / O unit 140 as various types (e.g., text, voice, image, video, or haptic).

[0455] Figure 23 A vehicle or an autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or the autonomous vehicle can be implemented by a mobile robot, an automobile, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Figure 23 Embodiments of can be combined with various embodiments of the present disclosure.

[0456] Referring to Figure 23 , the vehicle or the autonomous vehicle 100 can include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 can be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to Figure 21 blocks 110 / 130 / 140 of

[0457] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or autonomous driving vehicle 100. The control unit 120 can include an electronic control unit (ECU). The driving unit 140a can cause the vehicle or autonomous driving vehicle 100 to travel on the road. The driving unit 140a can include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b can supply power to the vehicle or autonomous driving vehicle 100, and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can acquire vehicle state, external environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technologies for maintaining the lane in which the vehicle travels, for automatically adjusting speed (e.g., adaptive cruise control), for autonomously driving along a determined path, for driving by automatically setting a path when a destination is set, etc.

[0458] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 can control the driving unit 140a so that the vehicle or autonomous driving vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can acquire the latest traffic information data from the external server non-periodically / periodically, and acquire surrounding traffic information data from adjacent vehicles. During autonomous driving, the sensor unit 140c can acquire vehicle state and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and the driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, the autonomous driving path, and / or the driving plan to the external server. The external server can use AI technology, etc. to predict traffic information data based on the information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0459] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or executed in a device, and the technical features in the device claims can be combined to be implemented or executed in a method. Additionally, the technical features in the (one or more) method claims and the (one or more) device claims can be combined to be implemented or executed in a device. Additionally, the technical features in the (one or more) method claims and the (one or more) device claims can be combined to be implemented or executed in a method.

Claims

1. A method for a first device to perform wireless communication, the method comprises the following steps: Based on the decoding of sidelink control information SCI, obtain information about a first resource reserved by a second device; Obtain information about the channel occupancy time COT duration; Select a second resource for transmitting the information about the COT duration, wherein the second resource is the resource N time slots before the first resource; and Based on the second resource, transmit the information about the COT duration to the second device.

2. The method according to claim 1, wherein, the N time slots are physical time slots.

3. The method according to claim 1, wherein, the information about the COT duration is obtained through configuration.

4. The method according to claim 1, wherein, the step of obtaining the information about the COT duration comprises the following steps: Generate the information about the COT duration.

5. The method according to claim 1, wherein, the transmission based on the first resource is a transmission for the first device.

6. The method according to claim 1, the method further comprises the following steps: Determine the N.

7. The method according to claim 1, wherein, the N is determined based on the decoding processing time of the information about the COT duration.

8. The method according to claim 1, wherein, the N is determined based on a priority value associated with the first resource.

9. The method according to claim 1, wherein, the COT duration is used by the second device.

10. The method according to claim 1, the method further comprises the following steps: Based on the second resource, transmit sidelink control information SCI for scheduling the physical sidelink shared channel PSSCH through the physical sidelink control channel PSCCH; and Based on the second resource, transmit a media access control MAC protocol data unit PDU through the PSSCH.

11. The method according to claim 10, wherein, the step of obtaining the information about the COT duration is performed based on a priority value associated with the MAC PDU being less than or equal to a threshold.

12. The method according to claim 10, wherein, the transmission of the information about the COT duration is performed based on a priority value associated with the MAC PDU being less than or equal to a threshold.

13. The method according to claim 1, wherein, the first resource is a resource for transmitting the sidelink synchronization signal block S-SSB.

14. A first device for performing wireless communication, the first device comprises: At least one transceiver; At least one processor; and At least one memory, the at least one memory is operatively connected to the at least one processor and stores instructions, the instructions cause the first device to perform operations when executed by the at least one processor, wherein the operations include: Obtain information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); Obtain information about the duration of a channel occupancy time (COT); Select a second resource for transmitting the information about the COT duration, wherein the second resource is the resource N time slots before the first resource; and Transmit the information about the COT duration to the second device based on the second resource.

15. A device adapted to control a first user equipment (UE), the device comprises: at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the first UE to perform operations, wherein the operations include: Obtain information about a first resource reserved by a second UE based on decoding of sidelink control information (SCI); Obtain information about the duration of a channel occupancy time (COT); Select a second resource for transmitting the information about the COT duration, wherein the second resource is the resource N time slots before the first resource; and Transmit the information about the COT duration to the second UE based on the second resource.

16. A non-transitory computer-readable storage medium storing instructions which, when executed, cause a first device to perform the following operations: Obtain information about a first resource reserved by a second device based on decoding of sidelink control information (SCI); Obtain information about the duration of a channel occupancy time (COT); Select a second resource for transmitting the information about the COT duration, wherein the second resource is the resource N time slots before the first resource; and Transmit the information about the COT duration to the second device based on the second resource.

17. A method for a second device to perform wireless communication, the method comprises the following steps: Transmit sidelink control information (SCI) including information about a first resource; Receive information about the duration of a channel occupancy time (COT) from a first device based on a second resource; Perform channel sensing for a type 2 channel access procedure (CAP) on the first resource during the COT duration; and Perform physical sidelink shared channel (PSSCH) transmission using the first resource based on the result of the channel sensing being idle, wherein the second resource is the resource N time slots before the first resource.

18. The method according to claim 17, wherein the PSSCH transmission is for the first device.

19. A second device for performing wireless communication, the second device comprises: at least one transceiver; at least one processor; and at least one memory, the at least one memory being operatively connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the second device to perform operations, wherein the operations include: Transmit sidelink control information (SCI) including information for a first resource; Receive, based on a second resource, information on a channel occupancy time (COT) duration from a first device; Perform channel sensing for a type 2 channel access procedure (CAP) on the first resource within the COT duration; and Based on the result of the channel sensing being idle, perform physical sidelink shared channel (PSSCH) transmission using the first resource, wherein the second resource is the resource of N time slots before the first resource.

20. The second device according to claim 19, wherein, the PSSCH transmission is a transmission for the first device.

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