Channel sensing method and apparatus for sidelink transmission in unlicensed band

Abstract

An operation method for a first device (100) in a wireless communication system is presented, the method may comprise the steps of: receiving information about COT from a second device (200); a plurality of PSSCHs are received; and determining to use the COT in order to transmit a plurality of PSFCHs related to the plurality of PSSCHs on the basis of transmitting a first PSFCH related to a first PSSCH from among the plurality of PSSCHs from a first resource within a first RB set related to the COT to the second device (200).

Description

Technical Field

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

[0002] Sidelink (SL) communication is a communication scheme in which a direct link is established between user equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is being considered as a solution to the eNB overhead caused by the rapid growth of data traffic. V2X (Vehicle to Everything) refers to a communication technology used by vehicles to exchange information with other vehicles, pedestrians, entities in which infrastructure (or, foundation) is established, and the like. V2X can be extended to four types such as V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), V2N (Vehicle to Network), and V2P (Vehicle to Pedestrian). V2X communication can be provided through a PC5 interface and / or a Uu interface.

[0003] At the same time, as a wider range of communication devices require greater communication capacity, the demand for mobile broadband communications that are more enhanced than existing radio access technologies (RATs) is rising. Therefore, services and user equipment (UE) that are sensitive to reliability and latency are discussed. And, the next generation of radio access technologies based on enhanced mobile broadband communications, massive machine type communications (MTC), ultra-reliable low latency communications (URLLC), etc. can be called new radio access technologies (RATs) or new radios (NRs). Summary of the invention

[0004] Technical Solution

[0005] According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the method may include: receiving information of a channel occupancy time (COT) from a second device; receiving multiple physical sidelink shared channels (PSSCHs); and determining to use the COT to send multiple PSFCHs associated with the multiple PSSCHs based on a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs being sent to the second device on a first resource within a first resource block (RB) set associated with the COT.

[0006] According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. 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 operably connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations based on being executed by the at least one processor. For example, the operations may include: receiving information about a channel occupancy time (COT) from a second device; receiving a plurality of physical sidelink shared channels (PSSCHs); and based on a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the plurality of PSSCHs being sent to the second device on a first resource within a first resource block (RB) set associated with the COT, determining that the COT is to be used to send a plurality of PSFCHs associated with the plurality of PSSCHs.

[0007] According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) may be proposed. For example, the device may include: at least one processor; and at least one memory, the at least one memory being operably connected to the at least one processor and storing instructions, the instructions causing the first UE to perform operations based on being executed by the at least one processor. For example, the operations may include: receiving information about a channel occupancy time (COT) from a second UE; receiving a plurality of physical sidelink shared channels (PSSCHs); and based on a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the plurality of PSSCHs being sent to the second UE on a first resource within a first resource block (RB) set associated with the COT, determining that the COT is to be used to send a plurality of PSFCHs associated with the plurality of PSSCHs.

[0008] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions may be executed to enable a first device to: receive information about a channel occupancy time (COT) from a second device; receive multiple physical sidelink shared channels (PSSCHs); and determine to use the COT to send multiple PSFCHs associated with the multiple PSSCHs based on a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs being sent to the second device on a first resource within a first resource block (RB) set associated with the COT.

[0009] According to an embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the method may include: sending information of a channel occupancy time (COT) to a first device; sending a first physical sidelink shared channel (PSSCH) to the first device; based on the COT, receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH from the first device, wherein the first PSFCH among the multiple PSFCHs to be sent by the first device will be sent to the second device, and the COT may be used for the transmission of multiple PSFCHs.

[0010] According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. 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 operably connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations based on being executed by the at least one processor. For example, the operations may include: sending information about channel occupancy time (COT) to a first device; sending a first physical sidelink shared channel (PSSCH) to the first device; based on the COT, receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH from the first device, wherein the first PSFCH of the multiple PSFCHs to be sent by the first device will be sent to the second device, and the COT may be used for the transmission of multiple PSFCHs.

[0011] Technical Effects

[0012] A user equipment (UE) may efficiently perform SL communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A communication structure that may be provided in a 6G system according to an embodiment of the present disclosure is shown.

[0014] Figure 2 The electromagnetic spectrum is shown according to one embodiment of the present disclosure.

[0015] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown.

[0016] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0017] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown.

[0018] Figure 6The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown.

[0019] Figure 7 An example of a BWP based on an embodiment of the present disclosure is shown.

[0020] Figure 8 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown.

[0021] Fig. 9 Three broadcasts based on embodiments of the present disclosure are shown.

[0022] Fig.10 An example of a wireless communication system supporting an unlicensed band according to an embodiment of the present disclosure is shown.

[0023] Fig.11 A method of occupying resources in an unlicensed band according to an embodiment of the present disclosure is shown.

[0024] Fig.12 A case where a plurality of LBT-SBs are included in an unlicensed band according to an embodiment of the present disclosure is shown.

[0025] Fig.13 A CAP operation performed by a base station to transmit a downlink signal through an unlicensed band according to an embodiment of the present disclosure is illustrated.

[0026] Fig.14 A Type 1 CAP operation for transmitting an uplink signal performed by a UE according to an embodiment of the present disclosure is illustrated.

[0027] Fig.15 A process in which a first device performs transmission on multiple PSFCHs using COT according to an embodiment of the present disclosure is shown.

[0028] Fig.16 An example is shown in which a PSFCH transmitting UE that has received a shared COT performs PSFCH transmission based on the COT according to an embodiment of the present disclosure.

[0029] Fig.17 A process for a first device to perform wireless communication according to an embodiment of the present disclosure is shown.

[0030] Fig.18 A process for a second device to perform wireless communication according to an embodiment of the present disclosure is shown.

[0031] Fig.19 A communication system 1 according to an embodiment of the present disclosure is shown.

[0032] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown.

[0033] Fig.21 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0034] Fig. 22 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0035] Fig.23 A handheld device according to an embodiment of the present disclosure is shown.

[0036] Fig.24 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0037] 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, C".

[0038] A slash ( / ) or a comma used in the present disclosure 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".

[0039] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". In addition, 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".

[0040] In addition, 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". In addition, "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".

[0041] In addition, brackets used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean proposing "PDCCH" as an example of "control information". In other words, the "control information" of the present disclosure is not limited to "PDCCH", and "PDCCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (ie, PDCCH)", this may also mean proposing "PDCCH" as an example of "control information".

[0042] In the following description, "when, if or in the case of" can be replaced by "based on".

[0043] The technical features described separately in one drawing in the present disclosure may be implemented separately or simultaneously.

[0044] In the present disclosure, the higher layer parameter may be a parameter configured, preconfigured or predefined for the UE. For example, the base station or the network may send the higher layer parameter to the UE. For example, the higher layer parameter may be sent via radio resource control (RRC) signaling or media access control (MAC) signaling.

[0045] The techniques described below may 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 may be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA may 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 may 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 systems based on IEEE 802.16e. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0046] 5GNR is a subsequent technology of LTE-A corresponding to a new mobile communication system with high performance, low latency, high availability, etc. 5GNR can use all available spectrum resources including low frequency bands less than 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequency (millimeter wave) above 24 GHz.

[0047] The goals of 6G (wireless communication) systems are (i) very high data rates per device, (ii) very large numbers of connected devices, (iii) global connectivity, (iv) very low latency, (v) lower energy consumption for battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) interconnected intelligence with machine learning capabilities. The vision of 6G systems can be four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and 6G systems can meet the requirements shown in Table 1 below. In other words, Table 1 is an example of the requirements of 6G systems.

[0048] [Table 1]

[0049]

[0050] The 6G system may have key factors such as eMBB (enhanced mobile broadband), URLLC (ultra-reliable low-latency communications), mMTC (massive machine-type communications), AI-converged communications, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0051] Figure 1 A communication structure that may be provided in a 6G system according to an embodiment of the present disclosure is shown. Figure 1 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0052] 6G systems are expected to have 50 times more simultaneous radio connection capabilities than 5G radio systems. URLLC, a key feature of 5G, will become a more dominant technology in 6G communications by providing end-to-end latency of less than 1 millisecond. In 6G systems, volume spectrum efficiency will be much better than the currently commonly used area spectrum efficiency. 6G systems will be able to provide very long battery life and advanced battery technology for energy harvesting, so mobile devices do not need to be charged separately in 6G systems. In 6G, new network characteristics may be as follows.

[0053] - Satellite converged networking: To provide global mobile population, 6G is expected to be integrated with satellite. Integrating terrestrial, satellite, and airborne networks into a single wireless communication system is very important for 6G.

[0054] -Connected Intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, and wireless evolution will be updated from "Internet of Things" to "Intelligent Connection". AI can be applied to every step of the communication process (or every step of signal processing, as described later).

[0055] - Seamless integration of wireless information and energy transfer: 6G wireless networks will provide power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0056] -Ubiquitous Ultra-3D Connectivity: Ultra-3D connectivity will arise from ubiquitous 6G to access networks and core network functions on drones and very low Earth orbit satellites.

[0057] Given the above new 6G network features, some common requirements may be as follows:

[0058] -Small Cell Network: The concept of small cell network is introduced into cellular system to improve the quality of received signal by improving processing throughput, energy efficiency and spectrum efficiency. Therefore, small cell network is an essential feature of communication system used in 5G and beyond 5G (5GB). Therefore, 6G communication system will also adopt the characteristics of small cell network.

[0059] -Ultra-dense heterogeneous network: Ultra-dense heterogeneous network will be another important feature of 6G communication system. Multi-layer network composed of heterogeneous networks will improve the overall service quality and reduce costs.

[0060] - High Capacity Backhaul: Backhaul connectivity is characterized by a high capacity backhaul network supporting a large volume of traffic. High-speed fiber and free space optics (FSO) systems could be a possible solution to this problem.

[0061] - Radar technology integrated with mobile technology: High-precision positioning (or location-based services) through communication is one of the characteristics of 6G wireless communication systems. Therefore, radar systems will be integrated with 6G networks.

[0062] -Software and virtualization: Software and virtualization are two important features that are fundamental to the design process in 5Gb networks to ensure flexibility, reconfigurability, and programmability. In addition, there are potentially billions of devices sharing on a shared physical infrastructure.

[0063] The core implementation technologies for 6G systems are described below.

[0064] -Artificial Intelligence: The most important new technology that will be introduced in 6G systems is artificial intelligence (AI). 4G systems do not involve artificial intelligence. 5G systems will support partial or very limited artificial intelligence. However, 6G systems will fully support artificial intelligence for automation. Advances in machine learning will create a more intelligent network for real-time communications in 6G. The introduction of artificial intelligence in the telecommunications sector can simplify and improve real-time data transmission. AI can use a large number of analyses to determine the way to perform complex target operations, which means that AI can improve efficiency and reduce processing delays. Time-consuming tasks such as handover, network selection, and resource scheduling can be completed instantly by using artificial intelligence. AI may also play an important role in M2M, machine-to-human, and human-to-machine communications. In addition, AI may become a fast communication method in brain-computer interfaces (BCI). AI-based communication systems can be supported by metamaterials, smart structures, smart networks, smart devices, smart cognitive radios, self-sustaining wireless networks, and machine learning.

[0065] -THz communication (THz communication): Data rates can be increased by increasing bandwidth. This can be achieved by using wide-bandwidth THz communication and applying advanced massive MIMO technology. Terahertz waves, also known as submillimeter radiation, refer to the frequency band between 0.1 and 10 THz, and the corresponding wavelengths generally range from 0.03 mm to 3 mm. The 100GHz-300GHz frequency band range (THz band) is considered to be the main part of the THz band for cellular communications. Adding the THz band to the millimeter wave band can increase the capacity of 6G cellular communications. 300GHz-3THz in the defined THz band belongs to the far infrared (IR) band. The 300GHz-3THz band is part of the optical band, but it is located on the boundary of the optical band and is located after the RF band. Therefore, the 300GHz-3THz band shows similarities with RF. Figure 2 The electromagnetic spectrum is shown according to one embodiment of the present disclosure. Figure 2 The embodiments of can be combined with various embodiments of the present disclosure. Key characteristics of terahertz communications include (i) widely available bandwidth to support very high data rates, and (ii) high path loss at high frequencies (for which highly directional antennas are essential). The narrow beamwidth produced by highly directional antennas can reduce interference. The small wavelength of terahertz signals allows a greater number of antenna elements to be integrated into devices and base stations operating in this frequency band. This enables the use of advanced adaptive array techniques that can overcome range limitations.

[0066] - Massive MIMO

[0067] -HBF, Holographic Beamforming

[0068] -Optical wireless technology

[0069] -FSO backhaul network

[0070] - Non-Terrestrial Network, NTN

[0071] -Quantum communication

[0072] - No cellular communication

[0073] -Integration of wireless information and power transmission

[0074] -Integration of wireless communication and sensing

[0075] - Integrated access and backhaul network

[0076] -Big Data Analysis

[0077] - Reconfigurable smart surface

[0078] -Metaverse

[0079] -Blockchain

[0080] -UAV, Unmanned Aerial Vehicle: Unmanned aerial vehicles (UAV) or drones will be an important part of 6G wireless communications. In most cases, high-speed data wireless connectivity is provided using drone technology. The BS entity is installed on the drone to provide cellular connectivity. Drones have specific features that fixed base station infrastructure does not have, such as easy deployment, strong line-of-sight links, and freedom of controlled movement. In emergency situations such as natural disasters, it is not economically feasible to deploy ground communication infrastructure and sometimes it is impossible to provide services in unstable environments. Drones can easily handle these situations. Drones will become a new paradigm in wireless communications. The technology meets the three basic requirements of wireless networks: eMBB, URLLC, and mMTC. Drones can also support many other uses, such as enhanced network connectivity, fire detection, disaster emergency services, security and monitoring, pollution monitoring, parking monitoring, accident monitoring, etc. Therefore, drone technology is recognized as one of the most important technologies for 6G communications.

[0081] -Autonomous driving, self-driving: For perfect autonomous driving, vehicles must communicate with each other to inform each other of dangerous situations, or vehicles must communicate with infrastructure such as parking lots and traffic lights to check information such as parking location information and signal change time. Vehicle-to-everything (V2X), a key element in building autonomous driving infrastructure, is a technology that allows vehicles to communicate and share information with various elements on the road in order to perform autonomous driving (for example, vehicle-to-vehicle (V2V) wireless communication and vehicle-to-infrastructure (V2I) wireless communication). In order to maximize the performance of autonomous driving and ensure high safety, fast transmission speeds and low-latency technologies are essential. In addition, in the future, autonomous driving will not only issue warnings or guidance information to the driver, but will actively intervene in vehicle operation and directly control the vehicle in dangerous situations, so the amount of information that needs to be sent and received will be huge, and 6G is expected to maximize autonomous driving with faster transmission speeds and lower latency than 5G.

[0082] For the sake of clarity, the description focuses on 5G NR, but the technical idea of ​​one embodiment of the present disclosure is not limited thereto. Various embodiments of the present disclosure may also be applicable to 6G communication systems.

[0083] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown. Figure 3 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0084] refer to Figure 3 , the next generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol terminations to the UE 10. For example, the BS 20 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 as other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, etc. For example, a BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to as other terms such as a base transceiver system (BTS), an access point (AP), etc.

[0085] Figure 3 The embodiment of illustrates the case where only gNB is included. BS20 can be connected to each other via Xn interface. BS20 can be connected to each other via the fifth generation (5G) core network (5GC) and NG interface. More specifically, BS20 can be connected to access and mobility management function (AMF) 30 via NG-C interface, and can be connected to user plane function (UPF) 30 via NG-U interface.

[0086] The radio interface protocol layer between the UE and the network can be classified into the first layer (L1), the second layer (L2), and the third layer (L3) based on the lower three layers of the open system interconnection (OSI) model known in the communication system. Among them, the physical (PHY) layer belonging to the first layer provides an information transfer service using a physical channel, and the radio resource control (RRC) layer located at 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.

[0087] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows the radio protocol stack for the user plane of Uu communication, and Figure 4 (b) in FIG. 5 shows the radio protocol stack of the control plane for Uu communication. Figure 4 (c) shows the radio protocol stack of the user plane for SL communication, and Figure 4 (d) in the figure shows the radio protocol stack of the control plane for SL communication.

[0088] refer to Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the media access control (MAC) layer, which is the upper layer of the physical layer, through the 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 the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0089] Between different physical layers (ie, the PHY layer of the transmitter and the PHY layer of the receiver), data is transferred through a physical channel. The physical channel may be modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and the physical channel uses time and frequency as radio resources.

[0090] The MAC layer provides services to the Radio Link Control (RLC) layer, which is a higher layer of the MAC layer, via logical channels. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transfer services through logical channels.

[0091] The RLC layer performs concatenation, segmentation, and reassembly of radio link control service data units (RLC SDUs). In order 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 through automatic repeat request (ARQ).

[0092] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is used to control logical channels, transport channels, and physical channels associated with the configuration, reconfiguration, and release of RBs. RBs are logical paths for data delivery between UEs and the network provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, the RLC layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer).

[0093] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include delivery, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include delivery and encryption / integrity protection of control plane data.

[0094] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and QoS Flow ID (QFI) marking in both DL and UL packets.

[0095] Configuration of RB means a process for specifying radio protocol layers and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. RBs can then be classified into two types, namely, signaling radio bearers (SRBs) and data radio bearers (DRBs). SRBs are used as a path for sending RRC messages in the control plane. DRBs are used as a path for sending user data in the user plane.

[0096] 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 may be in the RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state may maintain the connection with the core network and release its connection with the BS.

[0097] Data is sent from the network to the UE through a downlink transport channel. Examples of downlink transport channels include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services may be sent on a downlink SCH or may be sent on an additional downlink multicast channel (MCH). In addition, data is sent from the UE to the network through an uplink transport channel. Examples of uplink transport channels include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending user traffic or control messages.

[0098] Examples of logical channels belonging to a higher layer of a transport channel and mapped to the transport channel may include a broadcast channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

[0099] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown. Figure 5 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0100] refer to Figure 5 In NR, a radio frame can be used to perform uplink and downlink transmissions. The length of a radio frame is 10ms and can be defined as consisting of two half frames (HF). A half frame can include five 1ms subframes (SF). A subframe (SF) can be extended into one or more slots, and the number of slots within a subframe can be determined according to the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM (A) symbols depending on the cyclic prefix (CP).

[0101] When a normal CP is used, each time slot may include 14 symbols. When an extended CP is used, each time slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or a CP-OFDM symbol) and a single carrier-FDMA (SC-FDMA) symbol (or a discrete Fourier transform spread OFDM (DFT-s-OFDM) symbol).

[0102] Table 2 below shows the number of symbols per slot (N) according to SCS configuration (u) when normal CP or extended CP is used. slot symb ), the number of time slots per frame (N frame,u slot ) and the number of time slots per subframe (N subframe,u slot ).

[0103] [Table 2]

[0104]

[0105] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) may be configured differently between multiple cells integrated into one UE. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., subframe, time slot, or TTI) (collectively referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently in the integrated cells.

[0106] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, with an SCS of 15kHz, a wide range of traditional cellular bands can be supported, and with an SCS of 30kHz / 60kHz, dense cities, lower latency, and wider carrier bandwidths can be supported. With an SCS of 60kHz or higher, bandwidths greater than 24.25GHz can be used to overcome phase noise.

[0107] The NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values ​​of the frequency ranges may be changed (or varied), for example, the two different types of frequency ranges may be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 may mean "a range below 6 GHz", and FR2 may mean "a range above 6 GHz", and may also be referred to as millimeter wave (mmW).

[0108] [Table 3]

[0109]

[0110] As described above, the value of the frequency range in the NR system may be changed (or varied). For example, as shown in Table 4 below, FR1 may include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 may include frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands of 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 may include unlicensed bands. Unlicensed bands may be used for various purposes, for example, unlicensed bands are used for vehicle-specific communications (e.g., autonomous driving).

[0111] [Table 4]

[0112]

[0113] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown. Figure 6 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0114] refer to Figure 6 , a slot includes multiple symbols in the time domain. For example, in the case of normal CP, one slot may include 14 symbols. For example, in the case of extended CP, one slot may include 12 symbols. Alternatively, in the case of normal CP, one slot may include 7 symbols. However, in the case of extended CP, one slot may include 6 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP may correspond to a parameter set (e.g., SCS, CP length, etc.).

[0115] A carrier may include a maximum of N BWPs (eg, 5 BWPs). Data communication may be performed via the activated BWPs. 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.

[0116] Hereinafter, a bandwidth part (BWP) and a carrier will be described in detail.

[0117] A BWP may be a contiguous set of physical resource blocks (PRBs) within a given parameter set. A PRB may be selected from a contiguous set of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0118] For example, the BWP may 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 a DLBWP other than an activated DLBWP on a primary cell (PCell). For example, the UE may not receive a PDCCH, a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) other than an activated DLBWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DLBWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated ULBWP. For example, in the case of a downlink, the initial BWP may be given as a set of contiguous RBs for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by a physical broadcast channel (PBCH)). For example, in the case of an uplink, the initial BWP may be given by a system information block (SIB) for a random access procedure. For example, a default BWP may be configured by a higher layer. For example, the initial value of the default BWP may be an initial DLBWP.To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the UE's active BWP to the default BWP.

[0119] In addition, a BWP may be defined for SL. The same SLBWP may be used in transmission and reception. For example, a transmitting UE may send a SL channel or SL signal on a specific BWP, and a receiving UE may receive a SL channel or SL signal on a specific BWP. In a licensed carrier, the SLBWP may be defined separately from the UuBWP, and the SLBWP may have configuration signaling separate from the UuBWP. For example, the UE may receive a configuration for the SLBWP from the BS / network. For example, the UE may receive a configuration for the UuBWP from the BS / network. The SLBWP is (pre-)configured in the carrier for out-of-coverage NRV2XUEs and RRC_IDLEUEs. For a UE in RRC_CONNECTED mode, at least one SLBWP may be activated in the carrier.

[0120] 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 Figure 7 In the embodiment, the number of BWPs is 3.

[0121] refer to Figure 7, a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier frequency band to the other end thereof. Additionally, a PRB may be a resource block numbered within each BWP. Point A may indicate a common reference point of the resource block grid.

[0122] The BWP may be configured by point A, an offset relative to point A (NstartBWP), and a bandwidth (NsizeBWP). For example, point A may 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) are aligned in point A. For example, the offset may be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth may be the number of PRBs within a given parameter set.

[0123] Hereinafter, V2X or SL communication will be described.

[0124] The side link synchronization signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0125] The physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for sending default (system) information that the UE must first know before SL signal transmission / reception. For example, the default information may be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to resource pools, types of applications related to SLSS, subframe offsets, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NRV2X, the payload size of PSBCH may be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0126] S-PSS, S-SSS, and PSBCH can 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 can 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 can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0127] Figure 8 A process of performing V2X or SL communication by a UE based on a transmission mode according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of the present disclosure 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 an LTE transmission mode. In NR, the transmission mode may be referred to as an NR resource allocation mode.

[0128] For example, Figure 8 (a) shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 (a) in FIG. 1 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.

[0129] For example, Figure 8 (b) shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) shows UE operation associated with NR resource allocation mode 2.

[0130] refer to Figure 8 (a), in LTE transmission mode 1, LTE transmission mode 3 or NR resource allocation mode 1, the base station may schedule SL resources to be used by the UE for SL transmission. For example, in step S800, the base station may send information related to SL resources and / or information related to 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 used to report SL HARQ feedback to the base station.

[0131] For example, the first UE may receive information related to dynamic grant (DG) resources and / or information related to configuration grant (CG) resources from the 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 that the base station configures / allocates to the first UE through downlink control information (DCI). In the present disclosure, the CG resources may be (periodic) resources that the base station configures / allocates to the first UE through 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 a DCI related to the activation or release of the CG resources to the first UE.

[0132] In step S810, the first UE may send a PSCCH (e.g., sidelink control information (SCI) or first-stage SCI) to the second UE based on resource scheduling. In step S820, the first UE may send a PSSCH related to the PSCCH to the second UE (e.g., second-stage SCI, MAC PDU, data, etc.). 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 HARQ feedback information to the base station via the 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 a preconfigured rule. For example, the DCI may be a DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0133] refer to Figure 8(b), 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 the preconfigured SL resources. For example, the configured SL resources or the preconfigured SL resources may be a resource pool. For example, the UE may autonomously select or schedule resources for SL transmission. For example, the UE may perform SL communication by autonomously selecting resources within the configured resource pool. For example, the UE may autonomously select resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing may be performed in units of subchannels. For example, in step S810, the first UE that has selected resources from the resource pool by itself may send a PSCCH (e.g., sidelink control information (SCI) or a first stage SCI) to the second UE by using the resources. In step S820, the first UE may send a PSSCH (e.g., a second stage SCI, a 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.

[0134] refer to Figure 8 (a) or (b), for example, the first UE may send SCI to the second UE via PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., two-stage SCI) to the second UE via PSCCH and / or PSSCH. In this case, the second UE may decode two consecutive SCIs (e.g., two-stage SCI) to receive PSSCH from the first UE. In the present disclosure, the SCI sent via PSCCH may be referred to as the 1st SCI, the first SCI, the first-stage SCI, or the first-stage SCI format, and the SCI sent via PSSCH may be referred to as the 2nd SCI, the second SCI, the second-stage SCI, or the second-stage SCI format. For example, the first-stage SCI format may include SCI format 1-A, and the second-stage SCI format may include SCI format 2-A and / or SCI format 2-B.

[0135] refer to Figure 8 (a) or (b), in step S830, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resources, and the second UE may send HARQ feedback to the first UE using the PSFCH resources.

[0136] refer to Figure 8 (a), in step S840, the first UE may send SL HARQ feedback to the base station via the PUCCH and / or the PUSCH.

[0137] The following describes the terminal process of reporting HARQ-ACK on the side link.

[0138] The UE may be instructed to send a PSFCH including HARQ-ACK information in response to receiving a PSSCH by means of an SCI format, wherein the SCI format schedules the transmission of a PSFCH from N to N on one or more subchannels. PSSCH subch Receive PSSCH. The UE provides HARQ-ACK information including ACK or NACK or only NACK.

[0139] The number of slots in the resource pool used for PSFCH transmission opportunity resources may be provided to the UE via sl-PSFCH-Period-r16. If this number is zero, PSFCH transmission from the UE is disabled in the resource pool. PSFCH PSSCH = 0, the UE expects to be in time slot t' k SL (0≤k <T' max ) has a PSFCH transmission opportunity, where t' k SL is the time slot in the resource pool, and T' max is the number of time slots in the resource pool within 10240 ms, and N is provided in sl-PSFCH-Period-r16 PSFCH PSSCH . The UE may be instructed by upper layers not to send PSFCH in response to reception of PSSCH. If the UE receives PSSCH in a resource pool and the value of the HARQ feedback enable / disable indicator field included in the associated SCI format 2-A or SCI format 2-B is 1, the UE provides HARQ-ACK information via a PSFCH transmission from the resource pool. The UE sends PSFCH in a first time slot, where the first time slot is a time slot that includes PSFCH resources and is after the minimum number of time slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool after the last time slot of PSSCH reception.

[0140] sl-PSFCH-RB-Set-r16 provides the UE with the number of PRBs in the resource pool. PSFCH PRB,set , used for PSFCH transmission on PRBs in the resource pool. subch The number of PSSCH time slots associated with the PSFCH time slot and N PSFCH PSSCH(the number of subchannels used in the resource pool provided by sl-NumSubchannel), the UE allocates M for slot i and subchannel j in the PSSCH slot associated with the PSFCH slot PRB,set PSFCH PRB[(i+jN PSFCH PSSCH )-M PSFCH subch,slot ,(i+1+jN PSFCH PSSCH )-M PSFCH subch,slot -1]. Here, M PSFCH subch,slot =M PSFCH PRB,set / (N subch - NPSFCH PSSCH ), 0≤i <N PSFCH PSSCH , 0≤j <N subch , and the allocation starts in ascending order for i and continues in ascending order for j. The UE expects M PSFCH PRB,set N subch ·N PSFCH PSSCH multiples of.

[0141] The UE determines the number of available PSFCH resources for multiplexing the HARQ-ACK information included in the PSFCH transmission as R PSFCH PRB,CS =N PSFCH type ·M PSFCH subch,slot ·N PSFCH CS Here, N PSFCH CS It can be the number of cyclic shift pairs in the resource pool and is based on the indication of higher layers.

[0142] -N PSFCH type =1, and M PSFCH subch,slot The PRB may be associated with the starting subchannel of the corresponding PSSCH.

[0143] -N PSFCH type =N PSSCH subch And N PSSCH subch ·M PSFCH subch,slot N of PRB and corresponding PSSCHPSSCH subch One or more of the sub-channels are correlated.

[0144] PSFCH resources are firstly PSFCH type ·M PSFCH subch,slot The PRBs in the PRB are indexed in ascending order of the PRB index, and then, it is indexed in N PSFCH CS The cyclic shift pairs are indexed in ascending order of cyclic shift pair indices.

[0145] In response to PSSCH reception, the UE determines the index of the PSFCH resource used for PSFCH transmission as (P ID +M ID )modR PSFCH PRB,CS Here, P ID is the physical layer source ID provided by SCI format 2-A or 2-B for scheduling PSSCH reception, M ID Is the ID of the UE receiving the PSSCH. When the UE detects SCI format 2-A with a broadcast type indicator field value of "01", it is indicated from a higher layer. Otherwise, M ID is 0.

[0146] UE uses Table 5 from N PSFCH CS The cyclic shift pair index corresponding to the PSFCH resource index determines the m0 value used to calculate the cyclic shift α value.

[0147] [Table 5]

[0148]

[0149] As shown in Table 6, when the UE detects SCI format 2-A with a broadcast type indicator field value of "01" or "10", or as shown in Table 7, when the UE detects SCI format 2-B or SCI format 2-A with a broadcast type indicator field value of "11", the UE determines the value m used to calculate the cyclic shift α value. cs The UE applies one of the cyclic shifts to the sequence used in the PSFCH transmission.

[0150] [Table 6]

[0151]

[0152] [Table 7]

[0153]

[0154] Fig. 9Three broadcast types are shown in accordance with embodiments of the present disclosure. Fig. 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig. 9 (a) shows a broadcast type SL communication, Fig. 9 (b) shows unicast type SL communication, and Fig. 9 (c) shows a multicast type SL communication. In the case of a unicast type SL communication, the UE can perform a one-to-one communication with another UE. In the case of a multicast type SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, and the like.

[0155] Meanwhile, in the conventional unlicensed spectrum (NR-U), a communication method between a UE and a base station is supported in an unlicensed band. In addition, it is planned to support a mechanism for supporting communication in an unlicensed band between sidelink UEs in Rel-18.

[0156] In the present disclosure, a channel may refer to a set of frequency domain resources in which listen-before-talk (LBT) is performed. In NR-U, a channel may refer to a LBT bandwidth of 20 MHz and may have the same meaning as an RB set. For example, an RB set may be defined in Section 7 of 3GPP TS 38.214 V17.0.0.

[0157] In the present disclosure, channel occupancy (CO) may refer to time domain / frequency domain resources acquired by a base station or a UE after LBT is successful.

[0158] In this disclosure, channel occupation time (COT) may refer to the time domain resources acquired by the base station or UE after LBT is successful. It may be shared between the base station (or UE) and the UE (or base station) that acquires the CO, which 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.

[0159] Hereinafter, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0160] Fig.10 An example of a wireless communication system supporting an unlicensed band based on an embodiment of the present disclosure is shown. For example, Fig.10 Unlicensed spectrum (NR-U) wireless communication systems may be included. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0161] In the following description, a cell operating in a licensed band (hereinafter, L band) may be defined as an L cell, and a carrier of the L cell may be defined as (DL / UL / SL) LCC. In addition, a cell operating in an unlicensed band (hereinafter, U band) may be defined as a U cell, and a carrier of the U cell may be defined as (DL / UL / SL) UCC. A carrier / carrier frequency of a cell may refer to an operating frequency (eg, center frequency) of the cell. A cell / carrier (eg, CC) is generally referred to as a cell.

[0162] When the base station and UE Fig.10 When sending and receiving signals on LCC and UCC of carrier aggregation as shown in (a), LCC and UCC can be configured as primary CC (PCC) and secondary CC (SCC) respectively. The base station and UE can send and receive signals on one UCC or on multiple carrier aggregation UCCs, such as Fig.10 As shown in (b) of . In other words, the base station and the UE can send and receive signals only on the UCC without using any LCC. For independent operation, PRACH transmission, PUCCH transmission, PUSCH transmission, SRS transmission, etc. can be supported on the UCell.

[0163] exist Fig.10 In the embodiment of the present invention, the 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 the UCell.

[0164] Unless otherwise indicated, the following definitions apply to the following terms used in this disclosure.

[0165] - Channel: A carrier or a part of a carrier consisting of a set of consecutive RBs, where the channel access procedure is performed in a shared spectrum.

[0166] - Channel Access Procedure (CAP): A process for evaluating channel availability based on sensing before signal transmission in order to determine whether other communication nodes are using the channel. The basic sensing unit is a sensing slot with a duration of Tsl=9us. The base station or UE senses the channel during the sensing slot duration. If the power detected for at least 4us within the sensing slot duration is less than the energy detection threshold Xthresh, the sensing slot duration Tsl is considered to be idle. Otherwise, the sensing slot duration Tsl=9us is considered to be busy. CAP may also be referred to as Listen Before Talk (LBT).

[0167] - Channel occupancy: Transmission of the base station / UE on the channel after the channel access procedure.

[0168] - Channel Occupancy Time (COT): The total time that a base station / UE and any base stations / UEs sharing the channel occupation can perform transmissions on a channel after the base station / UE performs a channel access procedure. In the case of determining the COT, if a transmission gap is less than or equal to 25us, the gap duration can be counted into the COT. The COT can be shared for transmissions between a base station and the corresponding UE.

[0169] -DL transmission burst: A group of transmissions from a base station without any gaps greater than 16us. Transmissions from a base station separated by gaps greater than 16us are considered separate DL transmission bursts. The base station may perform transmissions after a gap without sensing channel availability within a DL transmission burst.

[0170] -UL or SL transmission burst: A group of transmissions from a UE without any gaps greater than 16us. Transmissions from a UE separated by gaps greater than 16us are considered as separate UL or SL transmission bursts. The UE may perform transmissions after a gap without sensing channel availability within the UL or SL transmission burst.

[0171] - Discovery Burst: A DL transmission burst that includes a set of signals and / or channels confined within a window and associated with a duty cycle. In LTE-based systems, a discovery burst may be a base station-initiated transmission that includes PSS, SSS, and cell-specific RS (CRS), and also includes non-zero power CSI-RS. In NR-based systems, a discovery burst may be a base station-initiated transmission that includes at least SS / PBCH blocks, and also includes a CORESET for scheduling a PDCCH carrying a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0172] Fig.11 A method of occupying resources in an unlicensed band according to an embodiment of the present disclosure is shown. Fig.11 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0173] refer to Fig.11, a communication node (e.g., base station, UE) within an unlicensed band should determine whether other communication nodes are using the channel before signal transmission. To this end, a communication node within an unlicensed band may perform a channel access procedure (CAP) to access the channel on which transmission is performed. The channel access procedure may be performed based on sensing. For example, a communication node may perform carrier sensing (CS) before sending a signal in order to check whether other communication nodes perform signal transmission. When other communication nodes do not perform signal transmission, a clear channel assessment (CCA) is confirmed. If a CCA threshold (e.g., XThresh) is predefined or configured by a higher layer (e.g., RRC), the communication node may determine that the channel is busy if the detected channel energy is higher than the CCA threshold. Otherwise, the communication node may determine that the channel is idle. If it is determined that the channel is idle, the communication node may initiate signal transmission in the unlicensed band. CAP may be replaced by LBT.

[0174] Table 8 shows an example of the channel access procedure (CAP) supported in NR-U.

[0175] [Table 8]

[0176]

[0177] Referring to Table 8, LBT types or CAPs for DL / UL / SL transmission may be defined. However, Table 8 is only an example, and new types or CAPs may be defined in a similar manner. For example, Type 1 (also known as Cat-4 LBT) may be a channel access procedure based on random backoff. For example, in the case of Cat-4, the contention window may vary. For example, Type 2 may be performed in the case of sharing the COT within the COT acquired by the base station (gNB) or UE.

[0178] Hereinafter, an LBT subband (SB) (or RB set) will be described.

[0179] In a wireless communication system supporting an unlicensed band, one cell (or carrier (e.g., CC)) or BWP configured for a UE may have a broadband having a larger bandwidth (BW) than in conventional LTE. However, the BW requiring CCA based on independent LBT operation may be restricted according to regulations. A subband (SB) in which LBT is performed independently is defined as an LBT-SB. Then, multiple LBT-SBs may be included in one broadband cell / BWP. A set of RBs included in the LBT-SB may be configured through higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) RB set allocation information, one or more LBT-SBs may be included in one cell / BWP.

[0180] Fig.12A case where a plurality of LBT-SBs are included in an unlicensed band according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0181] refer to Fig.12 , multiple LBT-SBs may be included in the BWP of a cell (or carrier). The LBT-SB may have, for example, a 20MHz frequency band. The LBT-SB may include multiple consecutive (P)RBs in the frequency domain, and may therefore be referred to as a (P)RB set. Although not shown, a guard band (GB) may be inserted between the LBT-SBs. Therefore, the BWP may 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 may be configured / defined in increasing order from the lowest frequency to the highest frequency.

[0182] Hereinafter, a channel access priority class (CAPC) will be described.

[0183] The CAPC of the MACCE and radio bearers can be fixed or configured to operate in FR1:

[0184] - Fixed as the lowest priority for filling Buffer Status Report (BSR) and Recommended Bit Rate MACCE;

[0185] -Fixed as the highest priority for SRB0, SRB1, SRB3 and other MACCEs;

[0186] -Configured by the base station for SRB2 and DRB.

[0187] When selecting the CAPC for a DRB, the base station considers fairness between other service types and transmissions while considering the 5QIs of all QoS flows multiplexed to the corresponding DRB. Table 9 shows which CAPC should be used for standardized 5QI, i.e., the CAPC for a given QoS flow. For 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.

[0188] [Table 9]

[0189]

[0190] Hereinafter, a method of transmitting a downlink signal through an unlicensed band will be described. For example, the method of transmitting a downlink signal through an unlicensed band may be applied to a method of transmitting a sidelink signal through an unlicensed band.

[0191] The base station may perform one of the following channel access procedures (eg, CAP) for downlink signal transmission in the unlicensed band.

[0192] (1) Type 1 Downlink (DL) CAP method

[0193] In Type 1 DLCAP, the length of the duration spanned by the sensing slots sensed as idle before the transmission can be random. Type 1 DLCAP can be applied to the following transmissions:

[0194] - a transmission initiated by a base station, comprising (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

[0195] - A transmission initiated by a base station, comprising (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0196] Fig.13 A CAP operation performed by a base station to transmit a downlink signal through an unlicensed band according to an embodiment of the present disclosure is illustrated. Fig.13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0197] refer to Fig.13 , the base station may sense whether the channel is idle for the sensing time slot duration of the delay duration Td. Then, if the counter N is zero, the base station may perform transmission (S134). In this case, the base station may adjust the counter N by sensing the channel during the additional sensing time slot duration according to the following steps:

[0198] Step 1) (S120) The base station sets N to Ninit (N=Ninit), where Ninit is a random number uniformly distributed between 0 and CWp. Then, proceed to step 4.

[0199] 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).

[0200] Step 3) (S150) The base station senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (yes), proceed to step 4. Otherwise (no), proceed to step 5.

[0201] Step 4) (S130) If N=0 (Y), the base station terminates the CAP (S132). Otherwise (No), proceed to step 2.

[0202] Step 5) (S160) The base station senses the channel until a busy sensing time slot is detected within the additional delay duration Td or all time slots of the additional delay duration Td are detected to be idle.

[0203] Step 6) (S170) If it is sensed that the channel is idle for all time slot durations of the additional delay duration Td (Yes), proceed to Step 4. Otherwise (No), proceed to Step 5.

[0204] Table 10 shows that the mp, minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW size applied to CAP vary according to the channel access priority category.

[0205] [Table 10]

[0206]

[0207] Referring to Table 10, the contention window size (CWS), the maximum COT value, etc. of each CAPC may be defined. For example, Td may be equal to Tf+mp*Tsl (Td=Tf+mp*Tsl).

[0208] The delay duration Td is configured in the following order: duration Tf (16us) + mp consecutive sensing time slot durations Tsl (9us). Tf includes the sensing time slot duration Tsl at the beginning of the 16us duration.

[0209] The following relationship is satisfied: CWmin,p<=CWp<=CWmax,p. CWp may be configured by CWp=CWmin,p and updated (CW size update) based on HARQ-ACK feedback (e.g., ratio of ACK or NACK) of a previous DL burst (e.g., PDSCH) before step 1. For example, CWp may be initialized to CWmin,p based on HARQ-ACK feedback for a previous DL burst. Alternatively, CWp may be increased to the next higher allowed value or remain as is.

[0210] (2) Type 2 Downlink (DL) CAP method

[0211] In Type 2 DLCAP, the length of the duration spanned by a sensing slot sensed as idle before transmission may be determined. Type 2 DLCAP is divided into Type 2A / 2B / 2C DLCAP.

[0212] Type 2 ADLCAP can be applied to the following transmission. In Type 2 ADLCAP, the base station can perform transmission immediately after sensing that the channel is idle for at least the sensing duration Tshort_dl = 25us. Here, Tshort_dl includes the duration Tf (= 16us) and a sensing slot duration immediately after the duration Tf, wherein the duration Tf includes the sensing slot at its beginning.

[0213] - A transmission initiated by a base station, including (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information, or

[0214] - Transmission by the base station after a gap of 25us from the transmission by the UE within the shared channel occupation.

[0215] Type 2B DLCAP applies to transmissions performed by the base station after a gap of 16us from transmissions by the UE during the shared channel occupancy time. In Type 2B DLCAP, the base station can transmit immediately after sensing that the channel is idle Tf=16us. Tf includes a sensing time slot within 9us relative to the end of the duration. Type 2C DLCAP applies to transmissions performed by the base station after a maximum of 16us from transmissions by the UE during the shared channel occupancy time. In Type 2C DLCAP, the base station does not perform channel sensing before performing transmission.

[0216] Hereinafter, a method of transmitting an uplink signal through an unlicensed band will be described. For example, the method of transmitting an uplink signal through an unlicensed band may be applied to a method of transmitting a sidelink signal through an unlicensed band.

[0217] The UE may perform a Type 1 or Type 2 CAP for UL signal transmission in the unlicensed band. In general, the UE may perform a CAP (e.g., Type 1 or Type 2) configured by the base station for UL signal transmission. For example, a UL grant that schedules PUSCH transmission (e.g., DCI formats 0_0 and 0_1) may include CAP type indication information for the UE.

[0218] (1) Type 1 Uplink (UL) CAP method

[0219] In Type 1 ULCAP, the length of the duration spanned by the sensing slots sensed to be idle before transmission is random. Type 1 ULCAP may be applied to the following transmissions.

[0220] -PUSCH / SRS transmission scheduled and / or configured by the base station

[0221] - PUCCH transmissions scheduled and / or configured by the base station

[0222] - Transmissions related to the Random Access Procedure (RAP)

[0223] Fig.14 A Type 1 CAP operation for transmitting an uplink signal performed by a UE according to an embodiment of the present disclosure is illustrated. Fig.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0224] refer to Fig.14 , the UE may sense whether the channel is idle for the time slot duration of the sensing delay duration Td. Then, if the counter N is zero, the UE may perform transmission (S234). In this case, the UE may adjust the counter N by sensing the channel during the additional sensing time slot duration according to the following steps:

[0225] Step 1) (S220) UE sets N to Ninit (N=Ninit), where Ninit is a random number uniformly distributed between 0 and CWp. Then, proceed to step 4.

[0226] Step 2) (S240) If N>0 and the UE determines to decrease the counter, the UE sets N to N-1 (N=N-1).

[0227] Step 3) (S250) The UE senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (yes), proceed to step 4. Otherwise (no), proceed to step 5.

[0228] Step 4) (S230) If N=0 (Y), the UE terminates the CAP (S232). Otherwise (No), proceed to step 2.

[0229] Step 5) (S260) The UE senses the channel until a busy sensing slot is detected within the additional delay duration Td or all slots of the additional delay duration Td are detected to be idle.

[0230] Step 6) (S270) If it is sensed that the channel is idle for all time slot durations of the additional delay duration Td (Yes), proceed to Step 4. Otherwise (No), proceed to Step 5.

[0231] Table 11 shows that mp, minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW size applied to CAP vary according to the channel access priority category.

[0232] [Table 11]

[0233]

[0234] Referring to Table 11, the contention window size (CWS), the maximum COT value, etc. of each CAPC may be defined. For example, Td may be equal to Tf+mp*Tsl (Td=Tf+mp*Tsl).

[0235] The delay duration Td is configured in the following order: duration Tf (16us) + mp consecutive sensing time slot durations Tsl (9us). Tf includes the sensing time slot duration Tsl at the beginning of the 16us duration.

[0236] The following relationship is satisfied: CWmin,p<=CWp<=CWmax,p. CWp may be configured by CWp=CWmin,p and updated (CW size update) based on an explicit / implicit reception response to a previous UL burst (e.g., PUSCH) before step 1. For example, CWp may be initialized to CWmin,p based on an explicit / implicit reception response to a previous UL burst. Alternatively, CWp may be increased to the next higher allowed value or remain as is.

[0237] (2) Type 2 Uplink (UL) CAP method

[0238] In Type 2 ULCAP, the length of the duration spanned by the sensing timeslot that is sensed to be idle before transmission can be determined. Type 2 ULCAP is divided into Type 2A / 2B / 2C ULCAP. In Type 2A ULCAP, the UE can perform transmission immediately after sensing that the channel is idle for at least the sensing duration Tshort_dl=25us. Here, Tshort_dl includes the duration Tf (=16us) and a sensing timeslot duration immediately after the duration Tf. In Type 2A ULCAP, Tf includes the sensing timeslot at its beginning. In Type 2B ULCAP, the UE can perform transmission immediately after sensing that the channel is idle for the sensing duration Tf=16us. In Type 2B ULCAP, Tf includes the sensing timeslots within 9us from the end of the duration. In Type 2C ULCAP, the UE does not perform channel sensing before performing transmission.

[0239] For example, according to the NR-U operation based on type 1 LBT, a UE with uplink data to be sent can select a CAPC mapped to the 5QI of the data, and the UE can perform NR-U operation by applying the parameters of the corresponding CACP (e.g., minimum contention window size, maximum contention window size, mp, 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, 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 BC by 1. If BC becomes zero and the UE detects that the channel is idle for a time Td (Td=Tf+mp*Tsl), the UE can attempt to send data by occupying the channel. For example, Tsl (=9us) is a basic sensing unit or sensing slot and may include a measurement duration of at least 4us. For example, the first 9us (=16us) of Tf can be configured as Tsl.

[0240] For example, according to NR-U operation based on Type 2 LBT, the UE may send data by performing Type 2 LBT (e.g., Type 2 ALBT, Type 2 BLBT, or Type 2 CLBT) within the COT.

[0241] For example, Type 2A (also known as Cat-2LBT (one-time LBT) or one-time LBT) can be a 25u one-time LBT. In this case, the transmission can start immediately after idle sensing of at least 25us interval. Type 2A can be used to initiate the transmission of SSB and non-unicast DL information. That is, the UE can sense the channel for 25us within the COT, and if the channel is idle, the UE can try to send data by occupying the channel.

[0242] For example, type 2B can be a 16us one-time LBT. In this case, the transmission can start immediately after the idle sensing of the 16us gap. That is, the UE can sense the channel for 16us within the COT, and if the channel is idle, the UE can try to send data by occupying the channel.

[0243] For example, in the case of Type 2C (also known as Cat-1 LBT or NoLBT), LBT may not be performed. In this case, the transmission may start immediately after a gap of up to 16us, and the channel may not be sensed before the transmission. The transmission duration may be up to 584us. The UE may attempt to transmit after 16us without sensing, and the UE may perform transmission up to 584us.

[0244] In the sidelink unlicensed band, the UE may perform a channel access operation based on listen before talk (LBT). Before the UE accesses a channel in the unlicensed band, the UE should check whether the channel to be accessed is idle (e.g., a state in which the UE does not occupy the channel, a state in which the UE can access the corresponding channel and transmit data) or busy (e.g., a state in which the channel is occupied and data is transmitted / received on the corresponding channel, and a UE attempting to access the channel cannot transmit data when the channel is busy). That is, the operation in which the UE checks whether the channel is idle or busy may be referred to as a clear channel assessment (CCA), and the UE may check whether the channel is idle or busy during the CCA duration.

[0245] Meanwhile, in future systems, the UE may perform sidelink transmission and / or reception operations in an unlicensed band. For operations in an unlicensed band, depending on the band-specific regulations or requirements, the UE's transmission may be preceded by a channel sensing operation (e.g., energy detection / measurement) for a channel to be used, and only when, as a result of the channel sensing, it is determined that the channel or RB set to be used is idle (e.g., if the measured energy is less than, equal to, or greater than a certain threshold), the UE may perform transmission in the unlicensed band, and if, according to the result of the channel sensing, it is determined that the channel or RB set to be used is busy (e.g., if the measured energy is greater than, equal to, or greater than a certain threshold), the UE may cancel all or part of the transmission in the unlicensed band.

[0246] Meanwhile, in the operation in the unlicensed band, the UE may omit or simplify the channel sensing operation (i.e., make the channel sensing interval relatively small) within a specific time interval after transmission of a specific time period, or conversely, after a specific time interval after transmission, the UE may decide whether to transmit after performing a normal channel sensing operation.

[0247] On the other hand, in transmission in an unlicensed band, depending on regulations or requirements, a time interval and / or a size of a frequency occupied area and / or a power spectral density (PSD) of a signal / channel transmitted by a UE may be greater than or equal to a specific level, respectively.

[0248] On the other hand, in the unlicensed band, in order to simplify channel sensing, it can be notified through channel occupation time (COT) duration information that the channel obtained through initial general channel sensing is occupied for a specific period of time, and the maximum value of the length of the COT duration can be set differently according to the priority value of the service or data packet.

[0249] On the one hand, the base station can share its COT duration obtained through 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 its COT duration obtained through channel sensing back to the base station that is the destination of the UE's UL transmission, and can provide relevant information via UL via CG-UCI. In the above case, the base station can perform simplified channel sensing within the COT duration shared by the UE.

[0250] At the same time, in the case of SL communication, there are situations where the base station instructs the UE to use resources for SL transmission through DCI or RRC signaling, such as mode 1RA operation, and there are situations where the UE performs SL transmission and reception through sensing operations between UEs without assistance from the base station, such as mode 2RA operation.

[0251] On the other hand, for channel access type 1 which can be used regardless of the channel occupancy time (COT) configuration, the procedures shown in Tables 12 and 13 are performed for DL ​​transmission, and the procedures shown in Tables 14 and 15 are performed for UL transmission.

[0252] [Table 12]

[0253]

[0254] [Table 13]

[0255]

[0256]

[0257] [Table 14]

[0258]

[0259]

[0260] [Table 15]

[0261]

[0262]

[0263]

[0264] Meanwhile, within the channel occupation time (COT), it is possible to use a simplified channel access type 2 before transmission, in the case of DL transmission, perform the process shown in Table 16, and in the case of UL transmission, perform the process shown in Table 17.

[0265] [Table 16]

[0266]

[0267]

[0268] [Table 17]

[0269]

[0270]

[0271] According to one embodiment of the present disclosure, type 2 ASL channel access can be in the same manner as type 2 ADL and / or UL channel access, and it can be in the form of a sensing interval including T_short_sl=25us and a T_f=16us interval including one sensing slot immediately after the sensing interval, where T_f includes the sensing slot at the beginning. The DL or UL scheme can also be used for basic idle determination.

[0272] According to one embodiment of the present disclosure, type 2 BSL channel access can be in the same manner as type 2 BDL and / or UL channel access, which can be in the form of a sensing interval including t_shorT_sl=25us and a T_f=16us interval including one sensing slot immediately after the sensing interval, where T_f includes the sensing slot at the beginning. The DL or UL scheme can also be used for basic idle determination.

[0273] According to one embodiment of the present disclosure, type 2 CSL channel access can be in the same manner as type 2 CDL and / or UL channel access, which may be a form in which channel sensing is not performed. Instead, the time interval of SL transmission may be up to 584us.

[0274] According to one embodiment of the present disclosure, Type 1SL channel access is performed in the same manner as Type 1DL and / or UL channel access, where i) an integer value N is randomly derived based on a contention window size corresponding to a priority category, ii) if a channel sensing result of a delay duration of size T_d corresponding to the priority category is idle, then if the counter value is idle in units of T_sl, the counter value is decremented to N-1; and iii) if the counter value is zero, the UE can occupy the RB set or channel subjected to channel sensing.

[0275] However, if it is determined that some of the channel sensing results of the above T_s1 interval are busy, channel sensing may be continued by maintaining the counter value until the channel sensing results of the delay duration of length T_d become idle again. In the above, the delay duration of length T_d may be in the form of m_p consecutive T_s1 after T_f=16us, where m_p is a value determined according to the priority category p, and may be a time interval for performing channel sensing in the case of T_s1=9us.

[0276] According to one embodiment of the present disclosure, when the UE has occupied the channel via a type 1 SL channel access and the UE is not ready to send a side link transmission, the UE may set a delay duration of length T_d and a sensing interval of length T_sl immediately before the side link transmission ready to be sent, and if both are idle, perform the side link transmission. Here, if either of them is busy, the UE may perform type 1 SL channel access again.

[0277] For example, if sidelink transmission is not possible at the end time point of channel sensing (for example, if the end time point of channel sensing is after the start time point of sidelink transmission), the UE may reselect the sidelink transmission resource. For example, the reselected resource may be selected in consideration of the end time point of channel sensing and / or the length of the remaining sensing interval. For example, the remaining sensing interval may be a value derived assuming that the channel sensing is completely idle.

[0278] For example, in type 1 SL channel access, T_f value and / or m_p value and / or T_sl value may be (pre)configured or predefined according to the SL priority value. For example, in the above-mentioned type 1 SL channel access, T_f value and / or m_p value and / or m_sl value may be different when PSCCH / PSSCH is transmitted and when PSFCH is transmitted. For example, T_f value and / or m_p value and / or T_sl value may be separately (pre)configured in type 1 SL channel access for PSCCH / PSSCH transmission and PSFCH transmission, respectively.

[0279] On the other hand, in the case of the side link, SLHARQ-ACK feedback can be disabled, and in the case of a specific SLHARQ-ACK feedback option, NACK is sent only when TB decoding fails, and SLHARQ-ACK feedback is not sent when TB decoding succeeds. Therefore, adjusting the size of the contention window for side link communication can be performed differently from the DL or UL method.

[0280] For example, the initial value of the contention window size CW_p for all priority classes may be set to a predefined CW_min,p value.

[0281] For example, if the UE does not expect to receive SLHARQ-ACK feedback after the size of the contention window CW_p for priority category p was last updated, and / or if there are only PSCCH / PSSCH transmissions with disabled SLHARQ-ACK feedback within the reference duration corresponding to the earliest SL channel occupancy after the last update of CW_p, the UE may maintain the value of CW_p for all or each priority category regardless of whether there are retransmissions for the same TB. For example, in the above, PSCCH / PSSCH transmissions with disabled SLHARQ-ACK feedback may be limited to cases where the transmission type is broadcast or multicast.

[0282] For example, if the UE does not expect to receive SLHARQ-ACK feedback after the last update of the contention window size CW_p for priority category p, and / or if there are only PSCCH / PSSCH transmissions with SLHARQ-ACK feedback disabled in the reference interval corresponding to the earliest SL channel occupancy after the last update of CW_p, if no retransmissions are included in the reference interval and / or if they are transmitted within a certain time interval T_w from the end time point of the reference interval, then CW_p may be maintained for all or each priority category. Otherwise, CW_p may be increased to the next allowed value for all or each priority category.

[0283] For example, the value of T_w may be a value (pre-)configured per resource pool and / or per SL priority value. For example, the value of T_w may be defined as max(T_A, T_B+1ms), where T_B is the length of the interval of the transmission burst from the beginning of the reference duration, and depending on whether there are other RATs and / or other links, T_A may be 5 milliseconds (if not present) and 10 milliseconds (if present).

[0284] For example, if the UE has SLHARQ-ACK feedback for PSCCH / PSSCH since the last update of the size CW_p of the contention window for priority category p, where SLHARQ-ACK feedback is enabled within a reference duration that the UE has transmitted, if at least one SLHARQ-ACK is determined to be ACK, then CW_p may be reset to the corresponding minimum value for all or each priority category, otherwise CW_p may be incremented to the corresponding next allowed value for all or each priority category. For example, the case where the SLHARQ-ACK is determined to be ACK may include the case where the UE does not detect the PSFCH in SLHARQ-ACK feedback option 1 (NACK only method).

[0285] For example, if the UE has SLHARQ-ACK feedback for PSCCH / PSSCH since the last update of the size CW_p of the contention window for priority category p, where SLHARQ-ACK feedback is enabled within the reference duration that the UE has transmitted, if the ratio of SLHARQ-ACKs determined to be NACKs is equal to or exceeds a certain threshold, then CW_p for all or each priority category may be increased to the corresponding next allowed value, otherwise CW_p may be reset to the corresponding minimum value for all or each priority category.

[0286] For example, if the UE has SLHARQ-ACK feedback for PSCCH / PSSCH since the last update of the size CW_p of the contention window for priority category p, where SLHARQ-ACK feedback is enabled within the reference duration that the UE has transmitted, if the ratio of SLHARQ-ACKs determined to be DTX is equal to or exceeds a certain threshold, then CW_p for all or each priority category may be increased to the corresponding next allowed value, otherwise CW_p may be reset to the corresponding minimum value for all or each priority category.

[0287] For example, if there is a PSSCH transmission for multicast HARQ-ACK feedback option 1 (NACK only) within the reference duration, the contention window size may be changed based on the NACK, otherwise the contention window size may be changed based on the ACK or DTX. For example, the threshold for NACK or DTX may be (pre)configured, or may be predefined as 90%, 80%, etc.

[0288] For example, after the last update of the contention window size CW_p for priority category p, if there is a PSCCH / PSSCH triggering an SLCSI report within the reference duration that the UE has sent, and if at least one SLCSI report is successfully received, CW_p can be reset to the corresponding minimum value for all or each priority category, and if no CSI report is detected within the delay limit for CSI reporting, CW_p can be incremented to the corresponding next allowed value for all or each priority category.

[0289] On the other hand, the UE may also perform type 1SL channel access when sending PSFCH. For example, if the UE is instructed / configured to perform type 1SL channel access for at least one PSFCH transmission when multiple PSFCHs are sent within the same RB set, the UE may use type 1SL channel access to determine whether to send multiple PSFCHs. This may prevent misunderstanding of channel sensing results by using type 1SL channel access.

[0290] For example, when the UE is instructed / configured to perform Type 2 Category SL channel access for at least one PSFCH transmission when sending multiple PSFCHs within the same RB set, the UE may use Type 2 Category SL channel access to determine whether to send multiple PSFCHs. Some PSFCH transmissions may already be included within a particular COT, and this may be a benefit to other transmissions from simplified channel sensing within the COT duration.

[0291] For example, when a UE sends multiple PSFCHs in the same RB set, a contention window size corresponding to the lowest priority category and / or SL priority value may be used for channel access. This may be for the purpose of ensuring an opportunity to send a PSFCH corresponding to important data.

[0292] For example, when a UE sends multiple PSFCHs within the same RB set, a contention window size corresponding to the highest valued priority category and / or SL priority value may be used for channel access.

[0293] For example, when a UE transmits multiple PSFCHs in the same RB set, the contention window size with the largest value may be used for channel access. This may be used for the purpose of minimizing the impact of PSFCH transmission on other transmissions.

[0294] Fig.15 A process in which a first device performs transmission on multiple PSFCHs using COT according to an embodiment of the present disclosure is shown. Fig.15 Can be combined with various embodiments of the present disclosure.

[0295] refer to Fig.15 , showing a first device communicating with a second device and a third device. Although the number of devices communicating with the first device is illustrated as two in this embodiment, the features of this embodiment can be extended to include a specific device communicating with three or more devices. For example, the communication performed in this embodiment can be performed in an unlicensed band.

[0296] In step S1510, the first device may receive information of the COT from the second device. In step S1520, the first device may receive a first PSSCH from the second device. In step S1525, the first device may receive a second PSSCH from the third device. That is, transmission of the first PSFCH and the second PSFCH associated with the first PSSCH and the second PSSCH may be pending at the first device.

[0297] In step S1530, the first device may determine whether to use COT. For example, the first device may determine to use COT to transmit the first PSFCH and the second PSFCH based on the fact that the first PFSCH is to be transmitted to the second device that has provided information about COT. In other words, even if the third device has not provided information about COT, the first device may determine to use COT for transmission of the second PSFCH to be sent to the third device based on the fact that a PSFCH transmission that is one of the pending PSFCH transmissions at the first device is scheduled to be sent to the second device that has provided COT.

[0298] In step S1540, the first device may perform a first PSFCH transmission to the second device using the COT, as determined above. In step S1545, the first device may perform a second PSFCH transmission to the third device using the COT, as determined above. In this embodiment, the order in which S1520 and S1525 are performed may be independent of the order of their respective reference numerals. In addition, in this embodiment, the order in which S1540 and S1545 are performed may be independent of the order of their respective reference numerals.

[0299] Fig.16 An example is shown in which a PSFCH transmitting UE that has received a shared COT performs PSFCH transmission based on the COT according to an embodiment of the present disclosure. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0300] Reference Fig.16 , showing the first RB set and the second RB set. The first RB set may include a COT. For example, a UE sending a COT may receive a COT from a COT generating UE via a PSFCH. For example, a PSFCH sending UE may have received a first PSSCH, a second PSSCH, and a third PSSCH from a COT generating UE, a third UE, and a fourth UE, respectively. In other words, the first PSFCH, the second PSSCH, and the third PSFCH, respectively associated with the first PSSCH, the second PSSCH, and the third PSSCH, may be pending at the PSFCH sending UE.

[0301] Here, for example, it is assumed that resources on which the first PSFCH and the third PSFCH are transmitted are included in the COT within the first RB set, and resources on which the second PSFCH is transmitted are included in the second RB set.

[0302] In this case, the PSFCH sending UE can use the COT to transmit all pending PSFCHs based on that the first PSFCH among the first PSFCH, the second PSFCH, and the third PSFCH will be sent to the COT generating UE that provides information about the COT.

[0303] In other words, a PSFCH transmitting UE may use COT to transmit a first PSFCH to be transmitted to a COT generating UE providing information about the COT. And, for example, a PSFCH transmitting UE may use COT to transmit a third PSFCH to be transmitted in the same RB set as the first PSFCH to be transmitted to the COT generating UE providing information about the COT. And, for example, a PSFCH transmitting UE may use COT to transmit a second PSFCH to be transmitted in a different RB set from the first PSFCH to be transmitted to the COT generating UE providing information about the COT.

[0304] For example, when it is determined that after the last update of the size CW_p of the contention window for priority category p, SCIs of source ID and / or destination ID and / or HARQ process number corresponding to SLHARQ-ACK feedback and / or PSFCH have been received and detected within the reference duration sent by the UE, and it is determined that the NDI of at least one of the received SCIs is switched, then CW_p can be reset to the corresponding minimum value for all or each priority category, otherwise, CW_p can be incremented to the corresponding next allowed value for all or each priority category.

[0305] For example, if the SCI of the source ID and / or destination ID and / or HARQ process number corresponding to the PSFCH has not been received and / or detected within a reference duration determined based on a sidelink transmission (e.g., PSFCH) sent by the UE or within a time interval from the end time point of the PSFCH transmission performed by the UE since the size CW_p of the contention window for priority category p was last updated, then CW_p may be incremented to each of the next allowed values ​​for all or each priority category. For example, the length of a specific time interval may be (pre-)configured for each resource pool and / or each priority category and / or each SL priority value. For example, the length of a specific time interval may be determined differently depending on the priority category and / or SL priority value of the PSFCH.

[0306] According to one embodiment of the present disclosure, the source ID and / or destination ID and / or broadcast type and / or SLHARQ-ACK feedback option and / or HARQ process number referenced in CW_p size adjustment may be limited to a specific value range. For example, a specific range of values ​​may be (pre-)configured.

[0307] For example, in a PSFCH transmission using type 1 SL channel access, the contention window size may be fixed to a specific value. For example, the specific value may be 3. For example, a specific value may be (pre)configured for each resource pool and / or each priority category and / or each SL priority value for PSFCH. For example, the priority category value for PSFCH may be the same as the priority value of the PSSCH corresponding to the PSFCH. For example, a priority category value for PSFCH may be (pre)configured or predefined for each SL priority value for PSFCH and / or each SL HARQ-ACK feedback option.

[0308] According to one embodiment of the present disclosure, whether to perform retransmission may be determined based on different SCIs received by the UE, or may be determined based on whether and where retransmission resources are reserved in the SCI previously received by the UE.

[0309] According to one embodiment of the present disclosure, the reference duration may be an interval from the start time point of channel occupation of the COT (for sidelink communication) occupied by the UE and / or the COT (for sidelink communication) occupied by the base station to the end time point of the first time slot, in which the actual specific sidelink transmission is performed for all allocated resources for the sidelink transmission. Alternatively, the reference duration may be an interval until the end time point of the first transmission burst of the actual specific sidelink transmission including all allocated resources for the sidelink transmission or until an earlier time point between the end time points.

[0310] For example, the above specific sidelink transmission can be PSCCH / PSSCH transmission for unicast and / or multicast and / or PSCCH / PSSCH enabling SL HARQ-ACK feedback. For example, when initializing the COT, the length of the reference duration can be (pre-)configured per resource pool and / or per SL priority value of the UE's SL transmission.

[0311] According to one embodiment of the present disclosure, the above combination may be used differently depending on whether the COT duration is initialized by the UE or the base station.

[0312] According to one embodiment of the present disclosure, the operation of adjusting the size of the contention window for the side link may be performed by unicast session (group) and / or by broadcast type and / or by transmission priority value and / or by SL transmission with SLHARQ-ACK feedback enabled / disabled and / or by SLHARQ-ACK feedback option.

[0313] For example, the contention window size adjustment process may be performed for when the first UE performs SL transmission to the second UE and when the second UE performs SL transmission to the third UE, respectively. For example, in HARQ-ACK-based contention window size adjustment, HARQ-ACK may be limited to a specific broadcast type and / or a specific unicast session.

[0314] According to one embodiment of the present disclosure, the operation of adjusting the size of the contention window for the side link may be performed based only on a specific broadcast type (eg, unicast or groupcast) and / or a PSSCH with SLHARQ-ACK feedback enabled.

[0315] According to one embodiment of the present disclosure, an operation of resetting the value of CW_p to the corresponding minimum value may be applied by being replaced by an operation of reducing the value of CW_p to a previously allowed value.

[0316] For example, the size of the contention window when performing type 1 SL channel access may be (pre-)configured per priority class and / or per SL priority and / or per resource pool. For example, in any of the above cases, the UE may not perform any operation to individually adjust the size of the contention window.

[0317] For example, conditions for using type 2A channel access may include: when the UE sends a synchronization signal and / or PSBCH for an unlicensed band, and / or when the length of the sidelink transmission interval is 1 millisecond or less, and / or when the sum of the transmission intervals within any 20 millisecond interval is 1 millisecond or less.

[0318] Depending on whether the transmission is within or outside the channel occupancy time (COT), the embodiments of the present disclosure can be applied in any combination of the above. Depending on the shape of the COT (e.g., whether it is semi-static or time-varying), the embodiments of the present disclosure can be applied in different combinations of the above. Depending on the carrier, according to the presence or absence of protection between RB sets, or according to regulations, the embodiments of the present disclosure can be applied in different combinations of the above.

[0319] Although the description in the present disclosure describes changing the contention window size for all priority classes, the concept in the present disclosure can be extended and applied in the form of changing the contention window size for each specific priority class or SL priority value.

[0320] According to one embodiment of the present disclosure, type 1 SL channel access and / or contention window size may be managed / maintained separately for PSCCH / PSSCH transmission and PSFCH transmission.

[0321] According to one embodiment of the present disclosure, for PSCCH / PSSCH transmission and PSFCH transmission, type 1SL channel access and / or contention window size can be jointly managed / maintained. For example, the contention window size determined based on PSCCH / PSSCH transmission can also be used for PSFCH transmission.

[0322] On the other hand, the UE may perform PSCCH / PSSCH transmission or PSFCH transmission for a plurality of RB sets, in which case it is necessary to define how to perform channel access for each RB set.

[0323] For example, when the UE sends a single or multiple PSFCHs and when it sends PSCCH / PSSCH, the channel access method for multiple channels or RB sets may be different. For example, when sending PSFCH, the channel access method for multiple RB sets may be determined based on the priority class and / or SL priority value corresponding to the PSFCH and / or the CW_p value corresponding to a specific PSFCH, and / or when sending PSCCH / PSSCH, the channel access method for multiple RB sets may be determined independently of the priority class and / or SL priority value.

[0324] For example, if the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the value of the counter N when type 1 SL channel access is performed for each RB set can be determined independently for each RB set.

[0325] For example, if the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1SL channel access for multiple RB sets, the value of counter N determined when performing type 1SL channel access for the RB set with the maximum CW_p value can be commonly applied to the value of counter N for other RB sets.

[0326] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the value of the counter N determined when performing type 1 SL channel access for the RB set with the smallest representative SL priority value and / or representative priority class can be commonly applied to the counter N values ​​for other RB sets. In this way, transmission opportunities for higher priority PSFCHs can be slightly more ensured.

[0327] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the value of the counter N determined when performing type 1 SL channel access for the RB set with the largest representative SL priority value and / or representative priority category can be commonly applied to the counter N values ​​for other RB sets. This can improve the channel sensing accuracy for high priority PSFCH transmission.

[0328] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the value of the counter N determined when performing type 1 SL channel access for the RB set related to HARQ-ACK feedback option 1 (NACK only) and / or NACK transmission can be commonly applied to the value of the counter N for other RB sets. This allows prioritization of NACK transmission in the case of the HARQ-ACK feedback option 1 scheme.

[0329] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCHs) based on type 1 SL channel access for multiple RB sets, the value of the counter N determined when performing type 1 SL channel access for the RB set having the largest number of simultaneously transmitted PSFCHs may be commonly applied to the values ​​of the counter N for other RB sets. The above operation is based on the fact that, as the number of simultaneous transmissions increases, the transmission power of a specific RB set may become larger, and the threshold used to determine whether it is busy when performing channel sensing may be different according to the transmission power.

[0330] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCHs) based on type 1SL channel access for multiple RB sets, the value of counter N determined when type 1SL channel access is performed for the RB set with the lowest number of simultaneously transmitted PSFCHs may be commonly applied to the values ​​of counter N for other RB sets.

[0331] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the value of the counter N determined when performing type 1 SL channel access for the RB set for which the UE is scheduled to transmit and / or receive the sidelink after the PSFCH transmission can be commonly applied to the value of the counter N for other RB sets. For example, in the above, the time interval between the PSFCH transmission and the scheduled sidelink transmission and / or reception can be within a specific threshold (e.g., 25us or 16us). For example, if the UE stops the sidelink transmission for the RB set for which the counter N value is determined, the UE can reset the N value for another RB set.

[0332] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the UE may randomly select an RB set from the transmission target RB set to be transmitted to perform channel sensing based on type 1 SL channel access. For example, the random selection may be performed so that the same RB set is not repeatedly selected within a specific time period (e.g., every 1 second).

[0333] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the RB set for which the UE performs channel sensing based on type 1 SL channel access may be an RB set with the largest representative SL priority value and / or representative priority category for PSFCH in the transmission target RB set. For example, if there are multiple such target RB sets, one target RB set may be selected or randomly selected according to the UE implementation.

[0334] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1 SL channel access for multiple RB sets, the RB set on which the UE performs channel sensing based on type 1 SL channel access may be a RB set in the transmission target RB set having the minimum representative SL priority value and / or representative priority category for PSFCH.

[0335] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCHs) based on type 1SL channel access for multiple RB sets, the RB set on which the UE performs channel sensing based on type 1SL channel access can be the RB set with the highest number of simultaneously transmitted PSFCHs in the transmission target RB set.

[0336] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCHs) based on type 1 SL channel access for multiple RB sets, the RB set for which the UE performs channel sensing based on type 1 SL channel access may be the RB set with the least number of simultaneously transmitted PSFCHs in the transmission target RB set. The above behavior is based on the fact that, depending on the number of simultaneously transmitted PSFCHs, the transmission power used for a specific RB set may be different, and therefore, the threshold used to determine whether it is busy when performing channel sensing may be different. Due to the above reasons, a trade-off may occur between ensuring transmission opportunities and channel sensing accuracy.

[0337] For example, when the UE performs multiple sidelink transmissions (e.g., PSFCH) based on type 1SL channel access for multiple RB sets, the RB set on which the UE performs channel sensing based on the type 1SL channel access may be a RB set for which sidelink transmission and / or reception is scheduled after the PSFCH transmission. For example, the time interval between the PSFCH transmission and the scheduled sidelink transmission and / or reception may be within a certain threshold (e.g., 25us or 16us). For example, the UE may perform simplified channel sensing (e.g., performing channel sensing within a fixed sensing interval (e.g., 25us)) on a transmission target RB set other than the RB set on which channel sensing is to be performed based on the above-mentioned type 1SL channel access.

[0338] For example, when performing channel sensing based on Type 1 SL channel access as described above, when calculating the CW_p value, the UE may change the way it calculates the CW_p value for each RB set to a way that is extended and applied to all RB sets.

[0339] For example, when performing channel sensing based on Type 1 SL channel access as described above, the UE may change to a method of determining the value of the counter N based on a maximum value among CW_p values ​​calculated for each RB set.

[0340] According to one embodiment of the present disclosure, when there are multiple PSFCHs in an RB set, the representative SL priority value and / or the representative priority category may be the minimum value and / or maximum value and / or average value for the PSFCHs.

[0341] According to one embodiment of the present disclosure, if the channel sensing result for a specific RB set is idle, otherwise it is busy, the UE may only send PSFCH within and / or including the idle RB set. For example, sending PSFCH for some RB sets may be limited to the case where there is a protection region between RB sets. For example, if there is no protection region between RB sets, if channel sensing is idle for all RB sets, and / or if all transmission target RB sets and their adjacent RB sets are idle, sidelink transmission (e.g., PSFCH) for a specific RB set of the UE is possible. For example, the adjacent RB set may be one up and / or one down in frequency, or may be multiple RB sets. For example, the number of adjacent RB sets may vary according to the number of RBs including the RB set and / or the subcarrier spacing and / or the channel frequency.

[0342] For example, when the UE performs multiple sidelink transmissions (e.g., PSCCH / PSSCH and / or S-SSB) based on type 1SL channel access to multiple RB sets, the UE may randomly select an RB set from the transmission target RB set to perform channel sensing based on type 1SL channel access.

[0343] For example, if the UE performs multiple sidelink transmissions (e.g., PSCCH / PSSCH and / or S-SSB) based on type 1SL channel access for multiple RB sets, the RB set on which the UE is to perform channel sensing based on type 1SL channel access may be the RB set to which the PSCCH is mapped.

[0344] For example, when the UE performs multiple sidelink transmissions (e.g., PSCCH / PSSCH and / or S-SSB) based on type 1 SL channel access for multiple RB sets, the RB set for which the UE performs channel sensing based on type 1 SL channel access may be the RB set to which the SL HARQ-ACK feedback resources and / or PSFCH resources corresponding to the PSCCH / PSSCH will be mapped. This may be to share the COT duration obtained based on type 1 SL channel access with the PSCCH / PSSCH receiving UE to achieve simplified channel sensing for PSFCH transmission. For example, the UE may perform type 1 SL channel access for the remaining transmission target RB sets, or perform type 2 category SL channel access. For example, the UE's operation of performing type 2 category SL channel access may be limited to the case where the channel frequency of the RB set allocated for sidelink transmission falls within a specific value set.

[0345] According to one embodiment of the present disclosure, the above-mentioned channel access type and whether to indicate / indication method can be applied differently to different SL channels. For example, for PSFCH transmission, the channel access type indicated by the corresponding SCI can be used, and / or for PSCCH / PSSCH transmission, the UE can use channel access type 1 or channel access type 2 categories depending on whether the transmission is outside or inside the COT, etc.

[0346] According to one embodiment of the present disclosure, the above-mentioned channel access type and whether / how to indicate can be applied differently according to the type of information included in the SL channel. For example, in the case of PSSCH transmission including CSI report, the channel access type indicated by the SCI that triggers the CSI report corresponding to the CSI report can be used.

[0347] The proposed method can be applied to the device described below. First, the processor 202 of the receiving UE can configure at least one BWP. Then, the processor 202 of the receiving UE can control the transceiver 206 of the receiving UE to receive the sidelink-related physical channel and / or the sidelink-related reference signal from the transmitting UE on the at least one BWP.

[0348] According to the prior art, the operation of SL communication in the unlicensed band is not defined, so PSFCH transmission in the unlicensed band is impossible. In addition, since the operation of the COT duration required to perform seamless communication on the unlicensed band is not defined in the SL, seamless SL communication on the unlicensed band is impossible.

[0349] According to an embodiment of the present disclosure, for multiple PSFCH transmissions on an unlicensed band, if even one PSFCH transmission is sent to a COT sharing UE, the COT duration for seamless communication can be used for all PSFCH transmissions, thereby achieving seamless PSFCH transmission on the unlicensed band.

[0350] Fig.17 A process in which a first device performs wireless communication according to an embodiment of the present disclosure is shown. Fig.17 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0351] refer to Fig.17 In step S1710, the first device may receive information of a channel occupancy time (COT) from the second device. In step S1720, the first device may receive a plurality of physical sidelink shared channels (PSSCHs). In step S1730, the first device may determine to use the COT to send a plurality of physical sidelink feedback channels (PSFCHs) associated with the plurality of PSSCHs based on a first PSFCH associated with a first PSSCH of the plurality of PSSCHs to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT.

[0352] For example, a plurality of PSSCHs may be received from a plurality of devices including the second device.

[0353] For example, additionally, the first device may use COT to perform transmission of the first PSFCH.

[0354] For example, performing transmission of the first PSFCH using the COT may include sending the first PSFCH on the first resource based on a type 2 listen-before-talk (LBT) operation.

[0355] For example, the type 2 LBT operation may include performing channel sensing from a time point that is spaced by a channel sensing interval before a start time point of the first resource to a start time point of the first resource.

[0356] For example, the length of the channel sensing interval may be determined based on a channel access priority class (CAPC) value associated with the transmission of the first PSFCH.

[0357] For example, the CAPC value may be determined to be 1 based on the first PSFCH being the PSFCH.

[0358] For example, channel sensing may include measuring energy within a channel sensing interval.

[0359] For example, the first PSFCH may be sent based on a result that the Type 2 LBT is idle.

[0360] For example, additionally, the first device may transmit a second PSFCH related to a second PSSCH among the plurality of PSSCHs using COT on a second resource within the first RB set based on determining to use COT.

[0361] For example, the second PSFCH may be sent to the third device.

[0362] For example, additionally, the first device may transmit a second PSFCH related to a second PSSCH among the plurality of PSSCHs using COT on a second resource within a second RB set based on determining to use COT.

[0363] For example, additionally, the first device may transmit a second PSFCH related to a second PSSCH among the plurality of PSSCHs using the COT on the first resource based on determining that the COT is to be used.

[0364] The above-described embodiments may be applied to various devices described below. First, the processor 102 of the first device 100 may control the transceiver 106 to receive information of a channel occupancy time (COT) from the second device 200. Furthermore, the processor 102 of the first device 100 may control the transceiver 106 to receive multiple physical sidelink shared channels (PSSCHs). Furthermore, the processor 102 of the first device 100 may determine to use COT to send multiple physical sidelink feedback channels (PSFCHs) associated with multiple PSSCHs based on a first PSFCH associated with a first PSSCH among the multiple PSSCHs to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT.

[0365] According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. 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 operably connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations based on being executed by the at least one processor. For example, the operations may include: receiving information about a channel occupancy time (COT) from a second device; receiving a plurality of physical sidelink shared channels (PSSCHs); and based on a first PSFCH associated with a first PSSCH among the plurality of PSSCHs to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT, determining to use the COT to send a plurality of physical sidelink feedback channels (PSFCHs) associated with the plurality of PSSCHs.

[0366] For example, a plurality of PSSCHs may be received from a plurality of devices including the second device.

[0367] For example, additionally, the operations may further include: using COT to perform transmission of the first PSFCH.

[0368] For example, performing transmission of the first PSFCH using the COT may include sending the first PSFCH on the first resource based on a type 2 listen-before-talk (LBT) operation.

[0369] For example, the type 2 LBT operation may include: performing channel sensing from a time point that is separated by a channel sensing interval before a start time point of the first resource to the start time point of the first resource.

[0370] For example, the length of the channel sensing interval may be determined based on a channel access priority class (CAPC) value associated with the transmission of the first PSFCH.

[0371] For example, the CAPC value may be determined to be 1 based on the first PSFCH being the PSFCH.

[0372] For example, channel sensing may include measuring energy within a channel sensing interval.

[0373] For example, the first PSFCH may be sent based on a result that the Type 2 LBT is idle.

[0374] For example, the operation may additionally further include: based on the determination to use the COT, sending a second PSFCH associated with a second PSSCH among the multiple PSSCHs using the COT on a second resource within the first RB set.

[0375] For example, the second PSFCH may be sent to the third device.

[0376] For example, the operations may additionally further include: based on the determination to use the COT, transmitting a second PSFCH associated with a second PSSCH among the plurality of PSSCHs using the COT on a second resource within a second RB set.

[0377] For example, the operations may additionally further include: based on the determination to use the COT, transmitting a second PSFCH associated with a second PSSCH among the plurality of PSSCHs using the COT on the first resource.

[0378] According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) may be proposed. For example, the device may include: at least one processor; and at least one memory, the at least one memory being operably connected to the at least one processor and storing instructions, the instructions causing the first UE to perform operations based on being executed by the at least one processor. The operations may include: receiving information about a channel occupancy time (COT) from a second UE; receiving a plurality of physical sidelink shared channels (PSSCHs); and based on a first PSFCH associated with a first PSSCH among the plurality of PSSCHs to be sent to the second UE on a first resource within a first resource block (RB) set associated with the COT, determining to use the COT to send a plurality of physical sidelink feedback channels (PSFCHs) associated with the plurality of PSSCHs.

[0379] According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, the instructions, based on being executed, may cause a first device to: receive information about a channel occupancy time (COT) from a second device; receive multiple physical sidelink shared channels (PSSCHs); and determine to use the COT to send multiple physical sidelink feedback channels (PSFCHs) related to the multiple PSSCHs based on the first PSFCH related to the first PSSCH among the multiple PSSCHs being sent to the second device on the first resource within the first resource block (RB) set related to the COT.

[0380] Fig.18 The invention shows a process in which a second device performs wireless communication according to an embodiment of the present disclosure. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0381] refer to Fig.18In step S1810, the second device may send information of a channel occupancy time (COT) to the first device. In step S1820, the second device may send a first physical sidelink shared channel (PSSCH) to the first device. In step S1830, the second device may receive a first physical sidelink feedback channel (PSFCH) related to the first PSSCH from the first device based on the COT. For example, based on the first PSFCH among the multiple PSFCHs to be sent by the first device to be sent to the second device, the COT may be used for transmission of the multiple PSFCHs.

[0382] For example, a plurality of PSFCHs may be associated with a plurality of PSSCHs transmitted from a plurality of devices including the second device to the first device.

[0383] The above-described embodiments may be applied to various devices described below. First, the processor 202 of the second device 200 may control the transceiver 206 to send information for a channel occupancy time (COT) to the first device 100. Furthermore, the processor 202 of the second device 200 may control the transceiver 206 to send a first physical sidelink shared channel (PSSCH) to the first device 100. Furthermore, the processor 202 of the second device 200 may control the transceiver 206 to receive a first physical sidelink feedback channel (PSFCH) related to the first PSSCH from the first device 100 based on the COT. For example, based on the first PSFCH among multiple PSFCHs to be sent by the first device 100 to be sent to the second device 200, the COT may be used for the transmission of multiple PSFCHs.

[0384] According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. 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 operably connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations based on being executed by the at least one processor. For example, the operations may include: sending information about channel occupancy time (COT) to a first device; sending a first physical sidelink shared channel (PSSCH) to the first device; based on the COT, receiving a first physical sidelink feedback channel (PSFCH) related to the first PSSCH from the first device, wherein the COT may be used for transmission of multiple PSFCHs based on the first PSFCH of the multiple PSFCHs to be sent by the first device being sent to the second device.

[0385] For example, the plurality of PSFCHs may be associated with a plurality of PSSCHs transmitted from a plurality of devices including the second device to the first device.

[0386] Various embodiments of the present disclosure may be combined with each other.

[0387] Hereinafter, devices to which respective embodiments of the present disclosure can be applied will be described.

[0388] The various descriptions, functions, processes, proposals, methods and / or operation flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection (e.g., 5G) between devices.

[0389] Hereinafter, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / descriptions, unless otherwise described, the same reference numerals may represent the same or corresponding hardware blocks, software blocks or functional blocks.

[0390] Fig.19 A communication system ( 1 ) according to an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0391] Reference Fig.19 , a communication system (1) to which various embodiments of the present disclosure are applied includes a wireless device, a base station (BS), and a network. Herein, a 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, but is not limited to, a robot (100a), a vehicle (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, a vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices and may be implemented in the form of head mounted devices (HMDs), head up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device (200a) may operate as a BS / network node relative to other wireless devices.

[0392] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things 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, and is not limited to the above names. Additionally or alternatively, the wireless communication technology 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 as various names including enhanced machine type communication (eMTC) and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTECAT0, 2) LTE CatM1, 3) LTE CatM2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTEM, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, a low power wide area network (LPWAN), and ZigBee considering low power communication, and is 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 IEEE802.15.4, etc., and may be referred to as various names.

[0393] 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., side link communication) with each other without going through the BS / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0394] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, wireless communication / connection may be established through various RATs (e.g., 5GNR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b may send / receive signals through various physical channels. To this end, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping), and at least a portion of a resource allocation process may be performed based on various proposals of the present disclosure.

[0395] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown. Fig. 20 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0396] Reference Fig. 20 , the first wireless device (100) and the second wireless device (200) may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device (100) and the second wireless device (200)} may correspond to Fig.19 {wireless device (100x) and BS (200)} and / or {wireless device (100x) and wireless device (100x)}.

[0397] 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 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 send a radio signal including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive a radio signal including second information / signals through the transceiver 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 operation of the (one or more) processors 102. For example, the memory (s) 104 may store software code including commands for executing part or all of the processing controlled by the processor (s) 102 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, the processor (s) 102 and the memory (s) 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver (s) 106 may be connected to the processor (s) 102 and transmit and / or receive radio signals through the antenna (s) 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver (s) 106 may be used interchangeably with the radio frequency (RF) unit (s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0398] 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 send a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal 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 memory (s) 204 may store software code including commands for executing part or all of the processing controlled by the processor (s) 202 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, the processor (s) 202 and the memory (s) 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver (s) 206 may be connected to the processor (s) 202 and transmit and / or receive radio signals through the antenna (s) 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver (s) 206 may be used interchangeably with the RF unit (s). In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0399] Below, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., 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 description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document. One or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow 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 (e.g., 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 operational flows disclosed in this document.

[0400] 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 operational flows 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. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flows 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, thereby being driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0401] 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, codes, instructions, and / or commands. One or more memories 104 and 204 may be composed of read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, registers, cash memory, computer-readable storage media, 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 via various technologies such as wired or wireless connections.

[0402] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the method and / or operation flow 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 description, function, process, proposal, method, and / or operation flow 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 perform control so 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 perform control so 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 description, functions, processes, proposals, methods and / or operation flows 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.

[0403] Fig.21 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Fig.21 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0404] Reference Fig.21 The signal processing circuit (1000) may include a scrambler (1010), a modulator (1020), a layer mapper (1030), a precoder (1040), a resource mapper (1050), and a signal generator (1060). Fig.21 Operation / function, not limited to Fig. 20The processor (102, 202) and / or transceiver (106, 206) of Fig. 20 The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig.21 For example, you can Fig. 20 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig. 20 The processor (102, 202) implements blocks 1010 to 1050 and can be Fig. 20 The transceiver (106, 206) is used to implement block 1060.

[0405] Can be through Fig.21 The signal processing circuit (1000) converts the codeword into a radio signal. Herein, the codeword is a coded bit sequence of an information block. The information block may include a transport block (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal may be transmitted through various physical channels (e.g., PUSCH and PDSCH).

[0406] Specifically, the codeword can be converted into a scrambled bit sequence by the scrambler 1010. 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 into a modulation symbol sequence by the modulator 1020. The modulation scheme may 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 modulation symbol sequence can be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbol of each transmission layer can be mapped (precoded) to (one or more) corresponding antenna ports by the precoder 1040. The output z of the precoder 1040 can be obtained by multiplying the output y of the layer mapper 1030 with 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) for the complex modulation symbol. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0407] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may 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 may generate a radio signal from the mapped modulation symbols, and the generated radio signal may be sent to other devices through each antenna. To this end, the signal generator 1060 may include an inverse fast Fourier transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), and an up-converter.

[0408] Can Fig.21 The signal processing process for the signal received in the wireless device is configured in a manner opposite to the signal processing process (1010-1060) of the wireless device. For example, the wireless device (e.g., Fig. 20 100, 200) can receive a radio signal from the outside through an antenna port / transceiver. The received radio signal can be converted into a baseband signal by a signal restorer. To this end, the signal restorer may include a frequency downlink converter, an analog-to-digital converter (ADC), a CP remover, and a fast Fourier transform (FFT) module. Next, the baseband signal can be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword can be restored to the original information block by decoding. Therefore, a signal processing circuit (not illustrated) for receiving a signal may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0409] Fig. 22 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 the use case / service (refer to Fig.19 ). Fig. 22 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0410] Reference Fig. 22 , the wireless device (100, 200) may correspond to Fig. 20 The wireless devices (100, 200) may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130) and additional components (140). The communication unit may include a communication circuit (112) and (one or more) transceivers (114). For example, the communication circuit (112) may include Fig. 20 One or more processors (102, 202) and / or one or more memories (104, 204) of the present invention. For example, the transceiver(s) (114) may include Fig. 20The control unit (120) is electrically connected to the communication unit (110), the memory (130) and the additional components (140), and controls the overall operation of the wireless device. For example, the control unit (120) can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). The control unit (120) can send 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 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).

[0411] The additional component (140) may be configured in various ways depending on the type of the wireless device. For example, the additional component (140) may include at least one of a power unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be implemented in the following forms without limitation: a robot ( Fig.19 100a), vehicles ( Fig.19 100b-1 and 100b-2), XR devices ( Fig.19 100c), handheld devices ( Fig.19 100d), household appliances ( Fig.19 100e), IoT devices ( Fig.19 100f), digital broadcasting terminals, hologram equipment, public safety equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI servers / equipment ( Fig.19 400), BS ( Fig.19 200), network nodes, etc. Depending on the use case / service, wireless devices can be used in mobile or fixed places.

[0412] exist Fig. 22In the wireless device (100, 200), all the various elements, components, units / parts and / or modules in the wireless device (100, 200) can be connected to each other through a wired interface, or at least part of them can be connected wirelessly 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 wire, and the control unit (120) and the first unit (e.g., 130, 140) can be connected wirelessly through the communication unit (110). Each element, component, unit / part and / or module in the wireless device (100, 200) can also include one or more elements. For example, the control unit (120) can be constructed by a collection of one or more processors. As an example, the control unit (120) can be constructed by a collection 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 ( 130 ) may be constructed by random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, nonvolatile memory, and / or combinations thereof.

[0413] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig. 22 .

[0414] Fig.23 A handheld device according to an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart pad, a wearable device (e.g., a smart watch or smart glasses), or a portable computer (e.g., a notebook). The handheld device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Fig.23 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0415] Reference Fig.23 The handheld device (100) may 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) may be configured as a part of the communication unit (110). Blocks 110 to 130 / 140a to 140c correspond to Fig. 22 Frame 110 to 130 / 140.

[0416] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling the constituent elements of the handheld device 100. The control unit 120 may include an application processor (AP). The memory unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The memory unit 130 may store input / output data / information. The power supply unit 140a may supply power to the handheld device 100 and include a wired / wireless charging circuit, a battery, etc. The interface unit 140b may support the connection of the handheld device 100 to other external devices. The interface unit 140b may include various ports (e.g., audio I / O ports and video I / O ports) for connecting to external devices. The I / O unit 140c may input or output video information / signals, audio information / signals, data and / or information input by a user. The I / O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker and / or a tactile module.

[0417] For example, in the case of data communication, the I / O unit 140c can obtain information / signals (e.g., touch, text, voice, image, or video) input by the user, and the obtained information / signals can be stored in the memory unit 130. The communication unit 110 can convert the information / signals stored in the memory into radio signals, and directly send the converted radio signals to other wireless devices or to the BS. The communication unit 110 can receive radio signals from other wireless devices or BSs, and then restore the received radio signals to the original information / signals. The restored information / signals can be stored in the memory unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0418] Fig.24 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Fig.24 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0419] Reference Fig.24 The vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a drive unit (140a), a power supply unit (140b), a sensor unit (140c) and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to Fig. 22Frame 110 / 130 / 140.

[0420] The communication unit 110 may 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 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may cause the vehicle or autonomous vehicle 100 to travel on the road. The drive unit 140a may include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and may include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may acquire vehicle status, external environment information, user information, etc. The sensor unit 140c may 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 / reverse 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 may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path with a destination set, and the like.

[0421] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically acquire the most recent traffic information data from an external server and acquire surrounding traffic information data from adjacent vehicles. In the middle of autonomous driving, the sensor unit 140c may acquire vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0422] 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 performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: receiving information for a channel occupancy time (COT) from a second device; Receive multiple physical sidelink shared channels (PSSCH); as well as Based on that a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs is to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT, it is determined that the COT is to be used to send multiple PSFCHs associated with the multiple PSSCHs.

2. The method according to claim 1, wherein: The plurality of PSSCHs are received from a plurality of devices including the second device.

3. The method according to claim 1, further comprising: Transmission of the first PSFCH is performed using the COT.

4. The method according to claim 3, wherein: Performing transmission of the first PSFCH using the COT includes: The first PSFCH is sent on the first resource based on a Type 2 Listen Before Talk (LBT) operation.

5. The method according to claim 4, wherein: The Type 2 LBT operation includes: Channel sensing is performed from a time point before a start time point of the first resource by a channel sensing interval to the start time point of the first resource.

6. The method according to claim 5, wherein: A length of the channel sensing interval is determined based on a channel access priority class (CAPC) value associated with transmission of the first PSFCH.

7. The method according to claim 6, wherein: The CAPC value is determined to be 1 based on that the first PSFCH is a PSFCH.

8. The method according to claim 5, wherein: The channel sensing comprises: Energy is measured during the channel sensing interval.

9. The method according to claim 4, wherein: Based on the type 2 LBT being idle, the first PSFCH is sent.

10. The method according to claim 1, further comprising: Based on the determination to use the COT, a second PSFCH associated with a second PSSCH among the plurality of PSSCHs is transmitted using the COT on a second resource within the first set of RBs.

11. The method according to claim 10, wherein: The second PSFCH is sent to a third device.

12. The method according to claim 1, further comprising: Based on the determination to use the COT, a second PSFCH associated with a second PSSCH among the plurality of PSSCHs is transmitted using the COT on a second resource within a second RB set.

13. The method according to claim 1, further comprising: Based on the determination that the COT is to be used, a second PSFCH associated with a second PSSCH among the plurality of PSSCHs is transmitted on the first resource using the COT.

14. A first device for performing wireless communication, the first device comprising: at least one transceiver; at least one processor; as well as at least one memory operably connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the first device to perform operations, The operations include: receiving information for a channel occupancy time (COT) from a second device; receiving a plurality of physical sidelink shared channels (PSSCH); and Based on that a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs is to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT, it is determined that multiple PSFCHs associated with the multiple PSSCHs are to be sent using the COT.

15. An apparatus adapted to control a first user equipment (UE), the apparatus comprising: at least one processor; as well as at least one memory operably connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the first UE to perform operations, The operations include: receiving information for a channel occupancy time (COT) from a second UE; receiving a plurality of physical sidelink shared channels (PSSCH); and Based on that a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs is to be sent to the second UE on a first resource within a first resource block (RB) set associated with the COT, it is determined to use the COT for sending multiple PSFCHs associated with the multiple PSSCHs.

16. A non-transitory computer-readable storage medium storing instructions that upon being executed cause a first device to: receiving information for a channel occupancy time (COT) from a second device; receiving a plurality of physical sidelink shared channels (PSSCH); and Based on that a first physical sidelink feedback channel (PSFCH) associated with a first PSSCH among the multiple PSSCHs is to be sent to the second device on a first resource within a first resource block (RB) set associated with the COT, it is determined that the COT is to be used to send multiple PSFCHs associated with the multiple PSSCHs.

17. A method for performing wireless communication by a second device, the method comprising: sending information for a channel occupancy time (COT) to the first device; sending a first physical sidelink shared channel (PSSCH) to the first device; receiving, based on the COT, a first physical sidelink feedback channel (PSFCH) associated with the first PSSCH from the first device, Wherein, based on the fact that the first PSFCH among the multiple PSFCHs to be sent by the first device is to be sent to the second device, the COT is used for transmission of multiple PSFCHs.

18. The method according to claim 17, wherein: The plurality of PSFCHs are associated with a plurality of PSSCHs transmitted from a plurality of devices including the second device to the first device.

19. A second device for performing wireless communication, the second device comprising: at least one transceiver; at least one processor; as well as at least one memory operably connected to the at least one processor and storing instructions that, upon execution by the at least one processor, cause the second device to perform operations, The operations include: sending information for a channel occupancy time (COT) to the first device; sending a first physical sidelink shared channel (PSSCH) to the first device; receiving, based on the COT, a first physical sidelink feedback channel (PSFCH) associated with the first PSSCH from the first device, Wherein, based on the fact that the first PSFCH among the multiple PSFCHs to be sent by the first device will be sent to the second device, the COT is used for transmission of multiple PSFCHs.

20. The method according to claim 19, wherein: The plurality of PSFCHs are associated with a plurality of PSSCHs transmitted from a plurality of devices including the second device to the first device.

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