Method and apparatus for reserving resources for nr sidelink transmission in unlicensed band

Abstract

A method of operation of a first apparatus (100) in a wireless communication system is presented. The method may comprise the steps of: determining a length of a channel sensing interval; selecting at least one resource on the unlicensed frequency band; performing a first channel sensing from a time point up to the channel sensing interval before a start time point of a first resource among the at least one resource to the start time point of the first resource; and performing the SL transmission using the first resource based on the result of the first channel sensing being idle.

Description

Technical Field

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

[0002] Sidelink (SL) refers to a communication method in which a direct link is configured between user equipment (UE) to exchange voice or data directly between user equipment without passing through a base station (BS). SL is being considered as a solution to the burden on base stations caused by the rapid increase in data traffic. V2X (Vehicle to Everything) refers to a communication technology that exchanges information with other vehicles, pedestrians, and objects equipped with infrastructure through wired / wireless communication. V2X can be divided into four types: V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), V2N (Vehicle to Network), and V2P (Vehicle to Pedestrian). V2X communication can be provided through the PC5 interface and / or the Uu interface.

[0003] In addition, since a wider range of communication devices require greater communication capacity, the demand for enhanced mobile broadband communications compared to existing radio access technologies (RATs) is rising. Therefore, services and user equipment that are sensitive to reliability and latency have been discussed. In addition, next-generation radio access technologies based on enhanced mobile broadband communications, massive machine type communications (MTC), ultra-reliable low-latency communications (URLLC), etc. may be referred to as new radio access technologies (RATs) or new radios (NRs). Summary of the invention

[0004] Technical Solution

[0005] According to one embodiment of the present disclosure, a method for performing wireless communication by a first device may be proposed. For example, the method may include the following steps: determining the length of a channel sensing interval; selecting at least one resource on an unlicensed frequency band, wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to the starting time point of the first resource; and performing secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0006] According to one 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 operatively 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: determining the length of a channel sensing interval; selecting at least one resource on an unlicensed band, wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to the starting time point of the first resource; and performing secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0007] According to one 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 operatively 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: determining the length of a channel sensing interval; selecting at least one resource on an unlicensed band, wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to the starting time point of the first resource; and performing secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0008] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be provided. For example, based on the execution of the instructions, a first device may: determine the length of a channel sensing interval; select at least one resource on an unlicensed frequency band, wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval; perform first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to the starting time point of the first resource; and perform secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0009] According to one embodiment of the present disclosure, a method for performing wireless communication by a second device may be proposed. For example, the method may include the following steps: performing a sub-link (SL) reception based on a first resource on an unlicensed frequency band, wherein, based on a result of channel sensing being idle, SL data received through the SL reception may be sent, wherein the channel sensing may be performed from a time point of a channel sensing interval before a starting time point of the first resource among at least one resource on the unlicensed frequency band to the starting time point of the first resource, and wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval.

[0010] According to one 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 operatively 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: performing a sublink (SL) reception based on a first resource on an unlicensed band, wherein, based on the result of channel sensing being idle, SL data received through the SL reception may be sent, wherein the channel sensing may be performed from a time point of a channel sensing interval before a starting time point of the first resource among at least one resource on the unlicensed band to the starting time point of the first resource, and wherein the time interval between the at least one resource may be longer than the length of the channel sensing interval.

[0011] Beneficial Effects

[0012] The user equipment (UE) can 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 according to an 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 6 The time slot structure of the NR frame according to an embodiment of the present disclosure is shown.

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

[0020] Figure 8 A process in which a UE according to an embodiment of the present disclosure performs V2X or SL communication according to a transmission mode is shown.

[0021] Fig. 9 Three broadcast types according to 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 for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown.

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

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

[0027] Fig.15 An example of selected burst resources in an unlicensed band according to one embodiment of the present disclosure is shown.

[0028] Fig.16 An example of resources used for SL communication in an unlicensed band according to one embodiment of the present disclosure is shown.

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

[0030] Fig.18 A process of a second device performing 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 "PDDCH" may be proposed as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean proposing "PDCCH" as an example of "control information".

[0042] In the following description, "when, if, or in the event of" may be replaced with "based on".

[0043] The technical features respectively described in a pair of drawings 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 medium access control (MAC) signaling.

[0045] The techniques described below can be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented using radio technologies such as Universal Terrestrial Radio Access (UTRA) or CDMA-2000. TDMA can be implemented using radio technologies such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented using radio technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility for 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) using 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] 5G NR is a subsequent technology of LTE-A corresponding to a new mobile communication system with high performance, low latency, high availability, etc. 5G NR 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 6G (wireless communication) system aims at (i) very high data rate per device, (ii) very large number 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) connected intelligence with machine learning capabilities. The vision of the 6G system can be embodied in four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can meet the requirements shown in Table 1 below. In other words, Table 1 is an example of the requirements of the 6G system.

[0048] [Table 1]

[0049] Peak data rate per device 1Tbps E2E Latency 1ms Maximum spectral efficiency 100bps / Hz Mobility support Up to 1000km / hr Satellite Integration completely AI completely Autonomous Vehicles completely XR completely Tactile communication completely

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

[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 higher simultaneous radio connectivity 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 1ms. In 6G systems, volume spectral efficiency will be better as opposed to area spectral efficiency that is often used today. 6G systems will be able to provide very long battery life and advanced battery technology for energy harvesting, so in 6G systems, mobile devices will not need to be charged separately. In 6G, new network features may be as follows.

[0053] -Satellite integrated network: In order to provide global mobile groups, 6G is expected to be integrated with satellites. Integrating terrestrial, satellite, and airborne networks into a single wireless communication system is important for 6G.

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

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

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

[0057] Given the above new network characteristics of 6G, some common requirements can be as follows

[0058] - Small cell network: The idea of ​​small cell network is introduced in cellular systems to improve the received signal quality due to improved processing throughput, energy efficiency and spectrum efficiency. Therefore, small cell network is an essential feature of communication systems through 5G and beyond 5G (5GB). Therefore, 6G communication systems 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 QoS and reduce costs.

[0060] - High Capacity Backhaul: Backhaul connectivity is characterized by a high capacity backhaul network to support a large volume of traffic. High-speed optical fiber and free space optics (FSO) systems can be possible solutions 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 essential to the design process in 5Gb networks to ensure flexibility, reconfigurability and programmability. In addition, billions of devices can be shared on a shared physical infrastructure.

[0063] The following describes the core implementation technologies for 6G systems.

[0064] -Artificial Intelligence: The most important and latest technology that will be introduced in 6G systems is AI. 4G systems do not involve AI. 5G systems will support partial or very limited AI. However, 6G systems will be fully AI-enabled for automation. In 6G, advances in machine learning will create more intelligent networks for real-time communications. The introduction of AI in telecommunications can simplify and improve real-time data transmission. AI can use many analyses to determine the way to perform complex target operations, which means that AI can improve efficiency and reduce processing delays. Time-consuming tasks such as switching, network selection, and resource scheduling can be completed instantly by using AI. AI can also play an important role in M2M, machine-to-man, and man-to-machine communications. In addition, AI can become a fast communication 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): The data rate can be increased by increasing the bandwidth. This can be achieved by using sub-THz communication with wide bandwidth and applying advanced massive MIMO technology. THz waves (also called sub-millimeter radiation) refer to the frequency band between 0.1THz and 10THz, where the corresponding wavelength is generally in the range of 0.03mm to 3mm. The 100GHz-300 GHz band range (sub-THz band) is considered to be the main part of the THz band for cellular communication. Adding the sub-THz band to the millimeter wave band increases the capacity of 6G cellular communication. 300GHz-3 THz in the defined THz band is in the far infrared (IR) band. The 300GHz-3 THz band is part of the optical band, but it is on the boundary of the optical band, just behind the RF band. Therefore, the 300GHz-3 THz band exhibits 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 THz communication include (i) widely available bandwidth supporting very high data rates, and (ii) high path loss at high frequencies (for which highly directional antennas are indispensable). The narrow beamwidth produced by highly directional antennas reduces interference. The small wavelength of THz signals allows a larger number of antenna elements to be integrated into devices and BSs operating in this 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 cell 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 surfaces

[0078] -Metaverse

[0079] -Blockchain

[0080] -UAV, Unmanned Aerial Vehicle (UAV) or drone will be an important part of 6G wireless communications. In most cases, UAV technology is used to provide high-speed data wireless connections. The BS entity is installed on the UAV to provide cellular connectivity. UAV has specific features not found in fixed BS infrastructure (e.g., easy deployment, strong line-of-sight link, and freedom of controlled mobility). During emergencies such as natural disasters, the deployment of terrestrial communication infrastructure is economically unfeasible and sometimes cannot provide services in volatile environments. UAV can easily handle these situations. UAV will be a new paradigm in wireless communications. This technology contributes to the three basic requirements of wireless networks: eMBB, URLLC, and mMTC. UAV can also support many other purposes such as enhanced network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, accident monitoring, etc. Therefore, UAV technology is considered to be one of the most important technologies for 6G communications.

[0081] -Autonomous driving, automated driving: For perfect autonomous driving, vehicles must communicate with each other to notify each other of dangerous situations, or communicate with infrastructure such as parking lots and traffic lights to check information such as the location of parking 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 with various elements on the road and share information in order to perform autonomous driving (e.g., 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 necessary. In addition, in the future, autonomous driving will go beyond delivering warning or guidance messages to the driver to actively intervene in vehicle operations and directly control the vehicle in dangerous situations, so the amount of information that needs to be sent and received will be large, 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 concept 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] Reference 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, the 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 the present invention illustrates a case where only gNB is included. BS20 may be connected to each other via an Xn interface. BS20 may be connected to each other via a fifth generation (5G) core network (5GC) and an NG interface. More specifically, BS20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface, and may be connected to a user plane function (UPF) 30 via an 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 transmission 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) in FIG. 1 shows a radio protocol stack for a 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) in FIG. 1 shows a radio protocol stack of a user plane for SL communication, and Figure 4 (d) in FIG. 5 shows the radio protocol stack of the control plane for SL communication.

[0088] Reference Figure 4 , the physical layer provides information transfer services to the upper layer through the physical channel. The physical layer is connected to the medium 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] Data is transmitted through a physical channel between different physical layers (ie, a PHY layer of a transmitter and a PHY layer of a receiver). The physical channel may be modulated using an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and uses time and frequency as radio resources.

[0090] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, and the RLC layer is a higher layer of the MAC layer. 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 transmission 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 transmission between UEs and networks 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 transmission, header compression and encryption of user data. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include transmission 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, and DRBs are used as a path for sending user data in the user plane.

[0096] When the RRC connection is established between the RRC layer of the UE and the RRC layer of the E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state, otherwise the UE can be in the RRC idle (RRC_IDLE) state. In the case of NR, the RRC inactive (RRC_INACTRIVE) state is additionally defined, and the UE in the RRC_INACTRIVE state can maintain the connection with the core network and release its connection with the BS.

[0097] The downlink transmission channels for sending (or transmitting) data from the network to the UE include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user services or control messages. The services or control messages of downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, the uplink transmission channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending initial control messages and an uplink shared channel (SCH) for sending other user services or control messages.

[0098] Examples of logical channels belonging to a higher layer of a transport channel and mapped to a transport channel may include a broadcast control 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] Reference 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 divided into one or more time slots, and the number of time slots within a subframe can be determined according to the subcarrier spacing (SCS). Each time 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 the SCS configuration (u) when using the normal CP or the extended CP. slot symb ), the number of time slots per frame (N frame,μ slot ) and the number of time slots per subframe (N subframe,μ slot ).

[0103] [Table 2]

[0104]

[0105] In the NR system, OFDM (A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE may be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., a subframe, a time slot, or a 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] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[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 frequency bands. Unlicensed frequency bands may be used for various purposes, for example, unlicensed frequency bands are used for vehicle-specific communications (e.g., autonomous driving).

[0111] [Table 4]

[0112] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

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

[0114] Reference Figure 6 , a time slot includes multiple symbols in the time domain. For example, in the case of normal CP, one time slot may include 14 symbols. However, in the case of extended CP, one time slot may include 12 symbols. Alternatively, in the case of normal CP, one time slot may include 7 symbols. However, in the case of extended CP, one time slot may include 6 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A bandwidth part (BWP) can 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, the bandwidth part (BWP) and the 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) outside 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 the 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 Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. 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 Uu BWP from the BS / network. SLBWP is (pre-)configured in the carrier for out-of-coverage NRV2X UEs and RRC_IDLE UEs. 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. Figure 7 In an implementation manner, the number of BWPs is 3.

[0121] Reference 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 a resource block grid.

[0122] It can be obtained by point A, the offset relative to point A (N start BWP ) and bandwidth (N size BWP ) to configure the BWP. For example, point A can be an external reference point of the PRBs of the 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 can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[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. PSSS may be referred to as a side link primary synchronization signal (S-PSS), and 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 S-PSS, and a Gold sequence of length 127 may be used for 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 S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0125] The physical sidelink broadcast channel (PSBCH) can be a (broadcast) channel for sending default (system) information, which the UE must first know before SL signal transmission / reception. For example, the default information can be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to 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 can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0126] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sublink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sublink control channel (PSCCH) / physical sublink shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within a (pre) configured sublink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH may exist across 11 RBs. In addition, the frequency position of the S-SSB may 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) in FIG. 1 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) in FIG. 4 shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 (b) in FIG. 1 shows UE operation related to NR resource allocation mode 2.

[0130] Reference 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 S600, 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 for reporting 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 configured / allocated to the first UE by the base station through downlink control information (DCI). In the present disclosure, the CG resources may be (periodic) resources configured / allocated to the first UE by the base station 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 a first-level SCI) to a second UE based on resource scheduling. In step S820, the first UE may send a PSSCH (e.g., a second-level 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. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE via the PSFCH. In step S840, the first UE may send / report the HARQ feedback information to the base station via 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] Reference 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 pre-configured SL resources. For example, the configured SL resources or the pre-configured 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., a sublink control information (SCI) or a first-level SCI) to a second UE by using the resources. In step S820, the first UE may send a PSSCH (e.g., a second-level 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] Reference Figure 8 (a) or (b), for example, the first UE may send the SCI to the second UE via the PSCCH. Alternatively, for example, the first UE may send two consecutive SCIs (e.g., level 2 SCIs) to the second UE via the PSCCH and / or the PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., level 2 SCIs) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first SCI, the first level SCI, or the first level SCI format, and the SCI sent via the PSSCH may be referred to as the second SCI, the second SCI, the second level SCI, or the second level SCI format. For example, the first level SCI format may include SCI format 1-A, and the second level SCI format may include SCI format 2-A and / or SCI format 2-B.

[0135] Reference 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 resource, and the second UE may use the PSFCH resource to send the HARQ feedback to the first UE.

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

[0137] Fig. 9Three types of broadcasts 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 broadcast type SL communication, Fig. 9 (b) in FIG. 4 shows unicast type SL communication, and Fig. 9 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast 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 can be replaced by SL multicast communication, SL one-to-many communication, etc.

[0138] In addition, 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 in Rel-18 to support a mechanism for supporting communication in an unlicensed band between secondary link UEs.

[0139] In the present disclosure, a channel may refer to a set of frequency domain resources that perform listen-before-talk (LBT). In NR-U, a channel may refer to an 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 TS38.214 V17.0.0.

[0140] In the present disclosure, channel occupancy (CO) may refer to time domain / frequency domain resources obtained by a base station or a UE after LBT succeeds.

[0141] In the present disclosure, channel occupation time (COT) may refer to the time domain resources obtained by a base station or UE after LBT is successful. The channel occupation time (COT) may be shared between a base station (or UE) that obtains CO and a UE (or base station), and this may be referred to as COT sharing. Depending on the initiating device, this may be referred to as gNB-initiated COT or UE-initiated COT.

[0142] Hereinafter, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0143] Fig.10 An example of a wireless communication system supporting an unlicensed frequency band based on an embodiment of the present disclosure is shown. 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.

[0144] 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. The carrier / carrier frequency of a cell may refer to an operating frequency (e.g., center frequency) of the cell. A cell / carrier (e.g., CC) is generally referred to as a cell.

[0145] like Fig.10 As shown in (a), when the base station and the UE send and receive signals on the LCC and UCC of carrier aggregation, the LCC and the UCC can be configured as a primary CC (PCC) and a secondary CC (SCC), respectively. Fig.10 As shown in (b), the base station and the UE can send and receive signals on one UCC or on a UCC of multiple carrier aggregation. 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 U cell.

[0146] exist Fig.10 In the implementation manner, the base station can be replaced by a UE. In this case, for example, PSCCH transmission, PSSCH transmission, PSFCH transmission, S-SSB transmission, etc. can be supported on the U cell.

[0147] Unless otherwise stated, the following definitions apply to the following terms used in this disclosure.

[0148] - Channel: A carrier or a portion of a carrier consisting of a contiguous set of RBs where a channel access procedure is performed in a shared spectrum.

[0149] - Channel Access Procedure (CAP): A procedure to evaluate 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 time slot, where the duration T sl =9us. The base station or UE senses the channel during the sensing time slot duration. If the power detected within at least 4us during the sensing time slot duration is less than the energy detection threshold X thresh , then the sensing time slot duration T sl is considered idle. Otherwise, the sensing time slot duration T sl = 9us is considered busy. CAP can also be called Listen Before Talk (LBT).

[0150] - Channel occupancy: Transmission of the base station / UE on the channel after the channel access procedure.

[0151] - Channel Occupancy Time (COT): The total time that the base station / UE sharing the channel and any base station / UE can perform transmission on the channel after the base station / UE performs the channel access procedure. In the case of determining the COT, if the transmission gap is less than or equal to 25us, the gap duration can be counted in the COT. The COT can be shared for transmission between the base station and the corresponding UE.

[0152] -DL transmission burst: A collection 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.

[0153] -UL or SL transmission burst: A set of transmissions from a UE without any gaps greater than 16us. Transmissions from a UE separated by gaps greater than 16us are considered separate UL or SL transmission bursts. The UE may perform transmissions after a gap without sensing channel availability within a UL or SL transmission burst.

[0154] -Discovery Burst: A DL transmission burst includes a set of signals and / or channels that are confined within a window and associated with a duty cycle. In an LTE-based system, a discovery burst may be a transmission initiated by a base station that includes PSS, SSS, and cell-specific RS (CRS), and also includes non-zero power CSI-RS. In an NR-based system, a discovery burst may be a transmission initiated by a base station that includes at least an SS / PBCH block, and also includes a CORESET for scheduling a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or a PDCCH carrying non-zero power CSI-RS.

[0155] Fig.11 A method for occupying resources in an unlicensed frequency 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.

[0156] Reference Fig.11 , a communication node (e.g., base station, UE) in an unlicensed band should determine whether other communication nodes are using the channel before signal transmission. To this end, a communication node in an unlicensed band may perform a channel access procedure (CAP) to access the channel where the 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 to check whether other communication nodes are performing signal transmission. When other communication nodes are not performing signal transmission, a clear channel assessment (CCA) is confirmed. If the CCA threshold (e.g., X Thresh) is predefined or configured by a higher layer (e.g., RRC), the communication node may determine that the channel is busy if the detected channel energy is above the CCA threshold. Otherwise, the communication node may determine that the channel is idle. If the channel is determined to be idle, the communication node may start signal transmission in the unlicensed band. CAP may be replaced by LBT.

[0157] Table 5 shows an example of a channel access procedure (CAP) supported in NR-U.

[0158] [Table 5]

[0159]

[0160] Referring to Table 5, LBT types or CAPs for DL / UL / SL transmission may be defined. However, Table 5 is only an example, and new types or CAPs may be defined in a similar manner. For example, Type 1 (also referred to 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 be changed. For example, Type 2 may be performed in the case of COT sharing within a COT acquired by a base station (gNB) or UE.

[0161] Hereinafter, an LBT-subband (SB) (or RB set) will be described.

[0162] In a wireless communication system supporting an unlicensed band, a 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 of a CCA that requires independent LBT operation may be limited according to regulations. A subband (SB) in which LBT is performed alone is defined as an LBT-SB. Then, multiple LBT-SBs may be included in one broadband cell / BWP. The RB set included in the LBT-SB may be configured by higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one or more LBT-SBs may be included in one cell / BWP.

[0163] Fig.12 The case where a plurality of LBT-SBs are included in the unlicensed band according to the 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.

[0164] Reference 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.

[0165] Hereinafter, a channel access priority class (CAPC) will be described.

[0166] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0167] - Fixed to the lowest priority for filling buffer status report (BSR) and recommended bit rate MAC CE;

[0168] - For SRB0, SRB1, SRB3 and other MAC CEs, fixed to the highest priority;

[0169] -For SRB2 and DRB, configured by the base station.

[0170] 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 a standardized 5QI (i.e., the CAPC to be used for a given QoS flow). For a standardized 5QI, the CAPC is defined as shown in the following table, and for a non-standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0171] [Table 6]

[0172]

[0173] Hereinafter, a method of transmitting a downlink signal through an unlicensed frequency band will be described. For example, the method of transmitting a downlink signal through an unlicensed frequency band may be applied to a method of transmitting a sidelink signal through an unlicensed frequency band.

[0174] The base station may perform one of the following channel access procedures (eg, CAP) for downlink signal transmission in the unlicensed band.

[0175] (1) Type 1 Downlink (DL) CAP method

[0176] In a Type 1 DL CAP, the length of the duration spanned by a sensing slot that is sensed as idle before a transmission may be random. Type 1 DL CAP may be applied to the following transmissions:

[0177] - a transmission initiated by a base station comprises (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

[0178] - A transmission initiated by a base station comprises (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0179] Fig.13 A CAP operation performed by a base station to transmit a downlink signal through an unlicensed frequency band according to an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0180] Reference Fig.13 , the base station can sense whether the channel is idle for the sensing delay duration T d 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:

[0181] Step 1) (S120) The base station sets N to N init (N=N init ), where N init For uniform distribution from 0 to CW p Then, proceed to step 4.

[0182] 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).

[0183] 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 (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0184] Step 4) (S130) If N=0 (Y), the base station terminates CAP (S132). Otherwise (N), proceed to step 2.

[0185] Step 5) (S160) The base station senses the channel until the additional delay duration T d The busy sensing time slot or additional delay duration T is detected dAll time slots are detected as idle.

[0186] Step 6) (S170) If the additional delay duration T d If the channel is sensed as idle during all time slot durations (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0187] Table 7 shows the m applied to CAP p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW size vary according to the channel access priority category.

[0188] [Table 7]

[0189]

[0190] Referring to Table 7, the contention window size (CWS), maximum COT value, etc. for each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0191] Delay duration T d Configure in the following order: Duration T f (16us)+m p Continuous sensing time slot duration T sl (9us).T f The sensing time slot duration T includes the time slot duration T at the beginning of the 16us duration. sl .

[0192] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Available via CW p =CW min,p The CW size may be configured and updated (CW size update) based on HARQ-ACK feedback (e.g., ratio of ACK or NACK) for a previous DL burst (e.g., PDSCH) before step 1. For example, the CW size may be updated based on HARQ-ACK feedback for a previous DL burst. p Initialize to CW min,p . Alternatively, CW p Can be increased to the next higher allowed value or left unchanged.

[0193] (2) Type 2 Downlink (DL) CAP Method

[0194] In a Type 2 DL CAP, the length of the duration spanned by a sensing slot sensed as idle before transmission may be determined. Type 2 DL CAPs are classified into Type 2A / 2B / 2C DL CAPs.

[0195] Type 2A DL CAP can be applied to the following transmissions. In Type 2A DL CAP, the base station can send a signal when the channel is sensed to be idle for at least the sensing duration T. short_dl = 25us and then the transmission is performed immediately. In this paper, T short_dl Including duration T f (=16us) and immediately after the duration T f After a sensing time slot duration, the duration T f Includes a sensing slot at its beginning.

[0196] - A transmission initiated by a base station, comprising (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information, or

[0197] - Transmission by the base station after a gap of 25us from the transmission by the UE within the shared channel occupancy.

[0198] Type 2B DL ​​CAP applies to transmissions performed by the base station after a 16us gap from the UE's transmission during the shared channel occupation time. In Type 2B DL ​​CAP, the base station can f = Transmission is performed immediately after being sensed as idle within 16us. T f Includes sensing slots within 9us from the end of the duration. Type 2C DL CAP applies to transmissions performed by the base station at most 16us after the UE's transmission during the shared channel occupation time. In Type 2C DL CAP, the base station does not perform channel sensing before performing transmission.

[0199] Hereinafter, a method of transmitting an uplink signal through an unlicensed frequency band will be described. For example, the method of transmitting an uplink signal through an unlicensed frequency band may be applied to a method of transmitting a sidelink signal through an unlicensed frequency band.

[0200] The UE may perform a Type 1 CAP or a Type 2 CAP for UL signal transmission in an unlicensed band. Typically, the UE may perform a CAP (e.g., Type 1 or Type 2) for UL signal transmission configured by the base station. For example, a UL grant (e.g., DCI format 0_0 and DCI format 0_1) for scheduling PUSCH transmission may include CAP type indication information for the UE.

[0201] (1) Type 1 Uplink (UL) CAP method

[0202] In Type 1 ULCAP, the length of the duration spanned by the sensing slots sensed as idle before transmission is random. Type 1 ULCAP may be applied to the following transmissions.

[0203] -PUSCH / SRS transmission scheduled and / or configured by the base station

[0204] - PUCCH transmissions scheduled and / or configured by the base station

[0205] - Transmissions related to the Random Access Procedure (RAP)

[0206] Fig.14 A Type 1 CAP operation performed by a UE to transmit an uplink signal according to an embodiment of the present disclosure is shown. Fig.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0207] Reference Fig.14 , the UE can sense the channel at a delay duration T d 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 slot duration according to the following steps:

[0208] Step 1) (S220) UE sets N to N init (N=N init ), where N init For uniform distribution from 0 to CW p Then, proceed to step 4.

[0209] Step 2) (S240) If N>0 and the UE determines to decrease the counter, the UE sets N to N-1 (N=N-1).

[0210] Step 3) (S250) The UE senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0211] Step 4) (S230) If N=0 (Y), the UE terminates the CAP (S132). Otherwise (N), proceed to step 2.

[0212] Step 5) (S260) The UE senses the channel until the additional delay duration T d The busy sensing time slot or additional delay duration T is detected dAll time slots are detected as idle.

[0213] Step 6) (S270) If the channel is within the additional delay duration T d If the time slot is sensed as idle for all time slot durations (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0214] Table 8 shows the m applied to CAP p , minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW size vary according to the channel access priority category.

[0215] [Table 8]

[0216]

[0217] Referring to Table 8, the contention window size (CWS), maximum COT value, etc. for each CAPC can be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0218] Delay duration T d Configure in the following order: Duration T f (16us)+m p Continuous sensing time slot duration T sl (9us).T f The sensing time slot duration T includes the time slot duration T at the beginning of the 16us duration. sl .

[0219] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Available via CW p =CW min,p Configuration, and before step 1, update (CW size update) based on explicit / implicit reception response for previous UL burst (e.g., PUSCH). For example, CW may be updated based on explicit / implicit reception response for previous UL burst. p Initialize to CW min,p . Alternatively, CW p Can be increased to the next higher allowed value or left unchanged.

[0220] (2) Type 2 Uplink (UL) CAP method

[0221] In Type 2 UL CAP, the length of the duration spanned by the sensing slot that is sensed as idle before transmission can be determined. Type 2 ULCAP is classified as Type 2A / 2B / 2C ULCAP. In Type 2A ULCAP, the UE can determine the duration of the sensing slot when the channel is sensed as idle for at least the sensing duration T. short_dl = 25us and then the transmission is performed immediately. In this paper, T short_dl Including duration T f (=16us) and immediately after the duration T f The duration of a sensing slot after that. In Type 2 AULCAP, T f In Type 2B ULCAP, the UE can sense the channel during the sensing duration T. f = Transmission is performed immediately after being sensed as idle within 16us. In Type 2 BULCAP, T f The sensing slot within 9us from the end of the duration is included. In Type 2C ULCAP, the UE does not perform channel sensing before performing transmission.

[0222] For example, according to NR-U operation based on Type 1 LBT, a UE having uplink data to be transmitted may select a CAPC mapped to a 5QI of the data, and the UE may select a CAPC of a 5QI mapped to the data by applying parameters of the corresponding CAPC (e.g., minimum contention window size, maximum contention window size, m p , etc.) to perform NR-U operation. For example, the UE may 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 may be a positive integer less than or equal to the random value. If the channel is idle, the UE sensing the channel decreases BC by 1. If BC becomes zero and the UE detects that the channel is idle at time T d (T d =T f +m p *T sl ) is idle, the UE can try to send data by occupying the channel. sl (=9 microseconds) is a basic sensing unit or sensing time slot and may include a measurement duration of at least 4 microseconds. f The first 9 microseconds of (=16 microseconds) can be configured as T sl .

[0223] 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 2C LBT) within the COT.

[0224] For example, Type 2A (also known as Cat-2 LBT (one shot LBT) or single LBT) can be a 25 microsecond one-time LBT. In this case, transmission can be started immediately after idle sensing for at least a 25 microsecond gap. Type 2A can be used to initiate transmission of SSB and non-unicast DL information. That is, the UE can sense the channel within the COT for 25 microseconds, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0225] For example, type 2B may be a 16 microsecond LBT. In this case, transmission may start immediately after idle sensing for a 16 microsecond gap. That is, the UE may sense the channel for 16 microseconds within the COT, and if the channel is idle, the UE may attempt to send data by occupying the channel.

[0226] For example, in the case of Type 2C (also known as Cat-1 LBT or No LBT), LBT may not be performed. In this case, the transmission may start immediately after a gap of up to 16 microseconds, and the channel may not be sensed before the transmission. The duration of the transmission may be up to 584 microseconds. The UE may attempt to transmit without sensing after 16 microseconds, and the UE may perform transmissions for up to 584 microseconds.

[0227] In the secondary link unlicensed band, the UE can 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 (for example, a state in which the UE does not occupy the channel, a state in which the UE can access the corresponding channel and send data) or busy (for example, a state in which the channel is occupied and data transmission / reception is performed on the corresponding channel, and the UE attempting to access the channel cannot send data when the channel is busy). That is, the operation of the UE checking whether the channel is idle or busy can be called a clear channel assessment (CCA), and the UE can check whether the channel is idle or busy during the CCA duration.

[0228] In addition, in future systems, the UE may perform sidelink transmission and / or reception operations in an unlicensed band. For operations in an unlicensed band, according to band-specific regulations or requirements, the UE's transmission may be preceded by a channel sensing operation (e.g., energy detection / measurement) for the channel to be used, and as a result of the channel sensing, the UE may perform transmission in the unlicensed band only when 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 specific threshold), and if 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 specific threshold) according to the result of the channel sensing, the UE may cancel all or part of the transmission in the unlicensed band.

[0229] In addition, in operation in an 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 within a specific time period, or, in contrast, after a specific time interval after transmission, the UE may decide whether to transmit after performing the usual channel sensing operation.

[0230] On the other hand, in transmission in an unlicensed band, according to regulations or requirements, the time interval and / or the size of the frequency occupied area and / or the power spectral density (PSD) of the signal / channel sent by the UE may be greater than or equal to a specific level, respectively.

[0231] On the other hand, in the unlicensed band, in order to simplify channel sensing, the channel occupation time (COT) duration information can be used to notify that it occupies the channel obtained through the initial general channel sensing within a specific time period, 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.

[0232] On the one hand, the base station can share its obtained COT duration 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 ensured by channel sensing with the base station that is the destination of the UE's UL transmission, and can provide relevant information through the UL via CG-UCI. In the above case, the base station can perform simplified channel sensing within the COT duration shared by the UE.

[0233] In the case of SL communication, there are cases where the base station instructs the UE to use resources for SL transmission through DCI or RRC signaling (e.g., Mode 1RA operation), and there are cases where the UE performs SL transmission and reception through sensing operations between UEs without the assistance of the base station (e.g., Mode 2RA operation).

[0234] In the case of DL transmission or UL transmission in an unlicensed band, transmission on consecutive time slots or resources is supported to alleviate the problem that the time to the next reserved resource or again to the next transmission may be long when the channel sensing result for the transmission resource is busy, and / or to reduce the overhead caused by channel sensing between transmissions. Consecutive transmissions may be for the same TB or data, or they may be for different TBs or data.

[0235] On the other hand, if PSFCH resources are configured in the resource pool, the time interval between scheduled resources during SL transmission can be limited to be greater than or equal to the HARQ round-trip time (RTT, which is determined as a combination of PSCCH / PSSCHRX processing time and / or PSFCHTX / RX processing time and / or PSCCH / PSSCHTX processing time).

[0236] For example, the SL transmission resources may be repeated N times for consecutive time slots. For example, during the N repetitions, the frequency domain resources of the SL transmission resources may remain the same. For example, during the N repetitions, the frequency domain resources of the SL transmission resources may remain the same for the RB set (group), but the RBs or interlaces within the RB set may be different.

[0237] For example, the frequency domain resource change may be determined based on the SL priority value and / or the repetition N value and / or the priority category and / or the time slot index and / or the source ID and / or the destination ID and / or the CRC value of the PSCCH, etc. For example, the frequency domain resource change may be indicated differently via the SCI sent in each time slot.

[0238] For example, the UE may indicate continuous resources via multiple TRIV and / or multiple FRIV fields via SCI. For example, TRIV may indicate the starting time slot of continuous SL burst resources for a single or multiple reserved resources, and / or the first FRIV may indicate the frequency resources for the first SL burst, and the second FRIV may indicate the frequency resources for the second SL burst. For example, TRIV may indicate a single or multiple reserved burst resource (starting and / or ending) time slot positions, including the time slots in which the PSCCH and / or PSSCH including TRIV are sent. For example, the reference time slots for the multiple reserved resource time slot positions indicated in TRIV may all be the same. For example, the same reference time slot may be the time slot to which the PSCCH and / or PSSCH including TRIV are sent. For example, the reference time slots for the multiple reserved resource time slot positions indicated in TRIV may be different for each reserved resource.

[0239] For example, the reference time slot indicated for the first reserved resource time slot may be a time slot for transmitting PSCCH and / or PSSCH including TRIV and / or an end time point of a SL burst for PSCCH and / or PSSCH including TRIV.

[0240] For example, the reference time slot indicated for the second reserved resource time slot may be the end time point of the SL burst for the PSCCH and / or PSSCH including TRIV and / or the start or end time point of the first reserved burst resource.

[0241] For example, the number of time slots including SL bursts may be the same for both the reserved resources indicated by TRIV and the PSCCH / PSSCH indicating TRIV. For example, the number of time slots including SL bursts may be (pre)configured and / or may be indicated by the PSCCH and / or PSSCH. For example, the number of time slots including SL bursts may be different for the reserved resources indicated by TRIV and for the PSCCH / PSSCH indicating TRIV. For example, the number of time slots including SL bursts may be (pre)configured separately for each reserved resource and / or for the PSCCH / PSSCH indicating TRIV, and / or may be indicated via the SCI.

[0242] For example, for the time slot position of each FRIV described above, the SL burst may consist of consecutive time slots, and the starting subchannel index indicated by the FRIV may be applied starting from the first time slot of the SL burst, and may be applied to the next time slots in sequence.

[0243] For example, TRIV may indicate a starting time slot of continuous SL burst resources for a single or multiple reserved resources, and / or a first starting subchannel index of a first FRIV and a second FRIV may indicate a frequency resource of a first SL burst, and a second starting subchannel index of a first FRIV and a second FRIV may indicate a frequency resource of a second SL burst.

[0244] For example, the reference time slots for multiple TRIVs may all be the same. For example, the reference time slots for multiple TRIVs may be time slots for transmitting PSCCH and / or PSSCH including TRIVs. For example, the reference time slots for multiple TRIVs may be different per TRIV group or per TRIV. For example, the reference time slot of the first TRIV may be a time slot for transmitting PSCCH and / or PSSCH including TRIVs. For example, the reference time slot of the second TRIV may be the end time point of the last SL resource and / or SL burst resource indicated by the first TRIV. For example, the reference time slot of the second TRIV may be the end time point of the last SL resource and / or SL burst resource that can be indicated by the first TRIV. For example, the reference time slot of the second TRIV may be indicated separately via PSCCH and / or PSSCH.

[0245] For example, the number of time slots comprising a SL burst may be the same for all multiple TRIVs. For example, the number of time slots comprising a SL burst may be (pre)configured and / or indicated by an SCI. For example, the number of time slots comprising a SL burst may be different for multiple TRIVs. For example, the number of time slots comprising a SL burst may be (pre)configured and / or indicated by an SCI per TRIV. For example, for each SL burst, the starting subchannel and / or number of subchannels indicated by a first FRIV may be applied to the starting time slot of the SL burst, followed by the starting subchannel and / or number of subchannels for the immediately subsequent time slot indicated by the first FRIV.

[0246] For example, the N value may be (pre) configured per resource pool and / or per SL priority value and / or per priority category and / or per whether SL HARQ-ACK feedback is enabled. For example, the N value may be a value indicated via the first SCI and / or the second SCI. For example, the N value may be indicated and / or configured and applied differently / independently according to the reserved resources indicated via the SCI. The N value may be applied in common to all reserved resources indicated via the SCI.

[0247] For example, all reserved resources may be limited to be used for the same TB. For example, all reserved resources may be used for different TBs, and the HARQ process number and / or NDI and / or RV and / or source ID and / or destination ID and / or whether SLHARQ-ACK and / or SLHARQ-ACK feedback options and / or playback type and / or SL priority may be indicated according to each TB or TB group via the second SCI. For example, all of the above-mentioned reserved resources may be used for different TBs, and the HARQ process number and / or NDI and / or RV and / or source ID and / or destination ID and / or whether SLHARQ-ACK and / or SLHARQ-ACK feedback options and / or playback type and / or SL priority may be indicated according to each TB or TB group via the second SCI in each time slot.

[0248] For example, the value of N may be determined by the UE implementation, but when indicated by the UE in the SCI, it may indicate how many PSCCH / PSSCH transmission resources are present in the subsequent consecutive time slots from the currently transmitted time slot. For example, the value of N may be determined by the UE implementation, but when indicated by the UE in the SCI, it may indicate whether there are PSCCH / PSSCH transmission resources in the next consecutive time slot from the currently transmitted time slot.

[0249] Fig.15 An example of selected burst resources in an unlicensed band according to one embodiment of the present disclosure is shown. Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0250] Reference Fig.15 , showing the first resource to the fifth resource. For example, the first resource to the fifth resource may be a burst resource selected according to an embodiment of the present disclosure, that is, the first resource to the fifth resource may be selected so that the interval between the resources is less than the minimum interval associated with the burst resource.

[0251] For example, the first to fifth resources may be selected from consecutive time slots. The first to fifth resources may be selected from consecutive time slots, but the positions within each time slot may be different.

[0252] For example, before performing transmission based on the first to fifth resources, channel sensing must be performed until the beginning of each of the first to fifth resources within the channel sensing interval. For example, only when the result of channel sensing related to each of the resources is idle, transmission on the resource can be performed.

[0253] For example, in this embodiment, it is assumed that the result of channel sensing related to the third resource is busy. In this case, the transmitting UE may perform resource reselection for the resources (third resource to fifth resource) (including the third resource) after the channel sensing whose result is busy. In this case, resource reselection may be performed for all resources from the third resource to the fifth resource. The inter-resource interval between the third resource to the fifth resource after resource reselection may be selected to be smaller than the minimum interval related to the burst resource.

[0254] For all or part of a set of reserved resources derived from the reserved resources and / or the number of repetitions of the reserved resources indicated in the SCI, the UE receiving the SCI in an embodiment of the present disclosure may exclude candidate resources that overlap with the reserved resources (based on RSRP measurement values) from the set of available candidate resources. For example, when the UE selects available resources, if the amount of available resource candidates before and / or after the RSRP threshold is increased is insufficient (for example, if the number of available resource candidates or the ratio within the resource selection window is lower than or equal to a (pre) configured threshold), the repeated resources or resources overlapping with the repeated resources may be included in the set of available resource candidates again.

[0255] In an embodiment of the present disclosure, the process in which the sending UE obtains PSCCH / PSSCH transmission resources for consecutive time slots may be a case in which all consecutive resources belong to a set of available resources in a resource selection (reselection) process based on RSRP measurement values. In an embodiment of the present disclosure, the process in which the sending UE obtains PSCCH / PSSCH transmission resources for consecutive time slots may be a case in which a portion of the consecutive resources (e.g., the first resource of each burst resource) belongs to a set of available resources in a resource selection (reselection) process based on RSRP measurement values.

[0256] In an embodiment of the present disclosure, the process by which a transmitting UE obtains PSCCH / PSSCH transmission resources for different TBs of consecutive time slots may be in the following form, wherein, when a resource selection (reselection) process is performed for each TB, or when multiple resource selection (reselection) processes are performed, another resource selection (reselection) process is performed based on mutually selected resources, and when the selected resources are determined, the final set of selected resources may be allocated to the same set of consecutive time slots and / or RB sets.

[0257] Although the embodiments of the present disclosure describe a method of indicating SL burst resources using a single TRIV and two FRIVs, a method of indicating SL burst resources using other combinations of these numbers may be applied to expand the concept of the present disclosure.

[0258] Although the embodiments of the present disclosure describe TRIV and / or FRIV indicating up to two resources, the concept of the present disclosure may be extended to the case of indicating more than two resources.

[0259] For example, after the channel sensing results for consecutive PSCCH / PSSCH transmission resources become idle, the UE may transmit only on the first PSCCH / PSSCH transmission resource.

[0260] For example, the UE may perform transmission only on PSCCH / PSSCH transmission resources that are positioned such that after the channel sensing results for consecutive PSCCH / PSSCH transmission resources become idle, the time difference between previous PSCCH / PSSCH transmissions for the same TB is greater than or less than the HARQ RTT.

[0261] For example, after the channel sensing result for the consecutive PSCCH / PSSCH transmission resources becomes idle, the UE may transmit from the first PSCCH / PSSCH transmission resource until the end of the subsequent consecutive transmission resources.

[0262] For example, the UE may perform transmission starting from a PSCCH / PSSCH transmission resource until the end of a subsequent continuous transmission resource, wherein the PSCCH / PSSCH transmission resource is positioned so that after the channel sensing result for the continuous PSCCH / PSSCH transmission resource becomes idle, the time difference between previous PSCCH / PSSCH transmissions for the same TB is greater than or less than the HARQ RTT and / or the reference channel sensing interval length and / or the sum of the above.

[0263] For example, when the UE performs a resource selection (reselection) process for SL transmission, the PSCCH / PSSCH transmission resources can be prioritized among the resources whose time difference between the PSCCH / PSSCH transmission resources is greater than or equal to the HARQ RTT and / or the reference channel sensing interval length and / or the maximum value of the above values ​​and / or the sum of the above values. For example, the PSCCH / PSSCH transmission resources can be determined so that the set of RB sets is the same or partially overlapped among the PSCCH / PSSCH transmission resources. For example, when selecting available resources, before or after raising the RSRP threshold, and / or when the amount of available resources is insufficient (the amount of available resource candidates or the proportion of candidate resources in the resource selection window is less than or equal to the (pre) configured threshold), resources belonging to different RB sets can be determined as PSCCH / PSSCH transmission resources.

[0264] For example, the reference channel sensing interval length may vary according to the priority class and / or SL priority value for SL transmission. For example, the reference channel sensing interval length may be (pre)configured per priority class and / or per SL priority value. For example, the reference channel sensing interval length may be a value derived based on the maximum value and / or minimum value and / or average value of the contention window size according to the priority class and / or SL priority value for SL transmission. For example, the reference channel sensing interval may be derived in the form of concatenating multiple delay durations based on a specific contention window size value.

[0265] Fig.16 An example of resources used for SL communication in an unlicensed band according to one embodiment of the present disclosure is shown. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0266] Reference Fig.16 , showing a first resource and a second resource. The first resource and the second resource may be resources in an unlicensed band. For example, for SL communication to be performed based on the first resource and the second resource, the result of channel sensing related to each resource may be idle.

[0267] For example, when selecting the first resource and the second resource, the interval between the resources may be longer than the channel sensing interval. For example, this may ensure that transmissions performed based on the earlier of the two resources do not affect the results of channel sensing associated with the later of the two resources.

[0268] For example, when the UE performs a resource selection (reselection) process for SL transmission, the time difference between the PSCCH / PSSCH transmission resources and the corresponding HARQ-ACK feedback resources and / or PSFCH resources can be determined so that the UE expects to receive HARQ-ACK feedback and / or PSFCH from the earliest HARQ-ACK feedback resources and / or PSFCH resources after the position relative to the PSSCH to PSFCH timing value and / or the reference channel sensing interval length and / or the maximum value of the values ​​and / or the sum of the values. For example, when the UE sends PSCCH / PSSCH, the HARQ-ACK feedback resources and / or PSFCH resources for PSCCH / PSSCH can be limited to a subset of the set of RB sets corresponding to the PSCCH / PSSCH resources (including the subset).

[0269] For example, when the UE performs a resource selection (reselection) process for SL transmission, the PSCCH / PSSCH transmission resources can be preferentially determined among the resources whose time difference between the PSCCH / PSSCH transmission resources (for retransmission) after the HARQ-ACK feedback resources and / or the PSFCH resources is greater than or equal to the time for detecting the HARQ-ACK feedback or PSFCH and the processing time for preparing the PSCCH / PSSCH and / or the reference channel sensing interval length and / or the maximum value of the above values ​​and / or the sum of the above values.

[0270] For example, if after the UE performs PSCCH / PSSCH transmission, the difference between the time point of transmission and the time point of the next reserved resource is less than the reference channel sensing interval length, the UE can omit PSCCH / PSSCH transmission in the next reserved resource.

[0271] For example, the operation may be limited to a case where the UE needs to perform type 1 channel access (channel sensing based on random backoff) for PSCCH / PSSCH transmission. For example, if after the UE performs PSCCH / PSSCH transmission, the difference between the time point of the transmission and the time point of the next reserved resource is less than the reference channel sensing interval length, the UE may reduce the actual channel sensing interval length to determine whether to send PSCCH / PSSCH in the next reserved resource based on the channel sensing result. For example, the actual channel sensing interval may be determined to be between the end time point of the PSCCH / PSSCH transmission performed by the UE and the start time point of the next reserved resource or within the end time point of the PSCCH / PSSCH transmission performed by the UE and the start time point of the next reserved resource.

[0272] For example, if after the UE performs PSCCH / PSSCH transmission, the difference between the time point of transmission and the time point of the next reserved resource is less than the reference channel sensing interval length, the UE may perform resource reselection for the next reserved resource. For example, if after the UE performs PSCCH / PSSCH transmission, the difference between the time point of transmission and the time point of the next reserved resource is less than the reference channel sensing interval length, the UE may perform simplified channel sensing (e.g., due to COT sharing, etc.) for transmission on the next reserved resource and perform PSCCH / PSSCH transmission.

[0273] For example, after the UE performs PSCCH / PSSCH transmission, if the difference between the time point of the transmission and the time point of the HARQ-ACK feedback and / or PSFCH resource for it is less than the reference channel sensing interval length, the PSCCH / PSSCH receiving UE may omit the HARQ-ACK feedback and / or PSFCH transmission. For example, when the UE needs to perform type 1 channel access (channel sensing based on random backoff) for HARQ-ACK feedback and / or PSFCH transmission, the operation may be restricted.

[0274] For example, after the UE performs PSCCH / PSSCH transmission, if the difference between the time point of the transmission and the time point of the HARQ-ACK feedback and / or PSFCH resources for it is less than the reference channel sensing interval length, the PSCCH / PSSCH receiving UE can reduce the actual channel sensing interval length to determine whether to send HARQ-ACK feedback and / or PSFCH based on the result of the channel sensing.

[0275] When the resource selection (reselection) unit in an embodiment of the present disclosure is an SL burst of multiple consecutive time slots, restrictions on the time difference between transmission resources can be applied based on the difference between the starting time slots of each SL burst, or restrictions on the time difference between transmission resources can be applied based on the difference between the end time point of the last time slot of the previous SL burst and the start time point of the first time slot of the next SL burst.

[0276] In an embodiment of the present disclosure, the delay duration may be a (pre)configured value, or it may be a cascaded form of a T_f = 16 microsecond interval followed by m_p consecutive T_sl = 9 microsecond long sensing slots, as in Type 1 channel access, where m_p may be a predefined value depending on the priority class.

[0277] For example, when the UE performs type 1 channel access (channel sensing based on random backoff) for reserved resources, the parameter N value for the size of the contention window and / or the number of delay durations and / or the reference channel sensing interval length (for example, the sensing interval length used to determine the distance between PSCCH / PSSCH resources during resource selection) can be indicated via the first SCI and / or the second SCI indicating the reserved resources.

[0278] For example, for repeated resources, if it is determined that it is an excluded resource by considering the re-evaluation of the channel sensing process and / or the preemption operation, the UE can omit the resource reselection for the repeated resources. For example, this can be in the form of reducing the actual size of the SL burst for the repeated resources. For example, if it is determined that the repeated resources are excluded resources by considering the re-evaluation of the channel sensing process and / or the preemption operation, the UE can reselect the entire resource of the SL burst.

[0279] Embodiments of the present disclosure may be applied in any combination of the above, depending on whether the transmission is within or outside the channel occupation time (COT). Embodiments of the present disclosure may be applied in different combinations of the above, depending on the shape of the COT (e.g., whether it is semi-static or time-varying). Embodiments of the present disclosure may be applied in different combinations of the above, depending on the carrier, depending on the presence or absence of protection between RB sets, or depending on regulations.

[0280] The proposed method can be applied to the apparatus 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 a sidelink-related physical channel and / or a sidelink-related reference signal from the transmitting UE on at least one BWP.

[0281] According to the prior art, since there is no defined SL communication operation in the unlicensed band, it is not possible to select resources to perform SL communication. According to an embodiment of the present disclosure, it is possible to select SL resources suitable for communication in the unlicensed band, and thus SL communication in the unlicensed band is possible.

[0282] 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.

[0283] Reference Fig.17 , in step S1710, the first device may determine the length of the channel sensing interval. In step S1720, the first device may select at least one resource on the unlicensed frequency band. For example, the time interval between at least one resource may be longer than the length of the channel sensing interval. In step S1730, the first device may perform first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to a starting time point of the first resource. In step S1740, the first device may perform a secondary link (SL) transmission for an idle use of the first resource based on the result of the first channel sensing.

[0284] For example, at least one resource may be selected based on sensing.

[0285] For example, the sensing may include: decoding side link control information (SCI) received in the sensed target resource; and excluding a resource expected to collide from candidate resources based on the decoded SCI.

[0286] For example, the first channel sensing may include measuring energy within a channel sensing interval.

[0287] For example, the first channel sensing may include a Type 1 Listen Before Talk (LBT) operation.

[0288] For example, the first channel sensing may include a type 2 LBT operation.

[0289] For example, at least one resource may be a burstable resource.

[0290] For example, at least one resource may be continuous in terms of time slots.

[0291] For example, additionally, the first device may: reselect a resource subsequent to the second resource among the at least one resource to at least one reselected resource.

[0292] For example, all resources after the second resource may be reselected, and at least one of the reselected resources may be continuous in terms of time slots.

[0293] For example, in addition, the first device may: perform second channel sensing from a time point of a channel sensing interval before a start time point of the second resource to a start time point of the second resource. For example, based on the result of the second channel sensing being busy, reselection may be performed.

[0294] For example, the length of the channel sensing interval may be determined based on a priority class associated with SL data transmitted through the SL transmission.

[0295] For example, the length of the channel sensing interval may be determined based on a priority value associated with SL data transmitted through the SL transmission.

[0296] The above-mentioned embodiments can be applied to the following various devices. First, the processor 102 of the first device 100 can determine the length of the channel sensing interval. And the processor 102 of the first device 100 can select at least one resource on the unlicensed frequency band. For example, the time interval between at least one resource can be longer than the length of the channel sensing interval. And the processor 102 of the first device 100 can perform the first channel sensing from the time point of the channel sensing interval before the starting time point of the first resource among the at least one resource to the starting time point of the first resource. And the processor 102 of the first device 100 can perform the secondary link (SL) transmission using the first resource for the idle control transceiver 106 based on the result of the first channel sensing.

[0297] According to one 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 operatively 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: determining the length of a channel sensing interval; selecting at least one resource on an unlicensed band, wherein the time interval between at least one resource may be longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to a starting time point of the first resource; and performing secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0298] For example, at least one resource may be selected based on sensing.

[0299] For example, the sensing may include: decoding side link control information (SCI) received in the sensed target resource; and excluding a resource expected to collide from candidate resources based on the decoded SCI.

[0300] For example, the first channel sensing may include measuring energy within a channel sensing interval.

[0301] For example, the first channel sensing may include a Type 1 Listen Before Talk (LBT) operation.

[0302] For example, the first channel sensing may include a type 2 LBT operation.

[0303] For example, at least one resource may be a burstable resource.

[0304] For example, at least one resource may be contiguous in terms of time slots.

[0305] For example, additionally, the operation may also include: reselecting a resource subsequent to the second resource among the at least one resource as the at least one reselected resource.

[0306] For example, all resources after the second resource may be reselected, and at least one of the reselected resources may be continuous in terms of time slots.

[0307] For example, in addition, the operation may also include: performing second channel sensing from a time point of a channel sensing interval before a start time point of the second resource to a start time point of the second resource. For example, reselection may be performed based on a result of the second channel sensing being busy.

[0308] For example, the length of the channel sensing interval may be determined based on a priority class associated with SL data transmitted through the SL transmission.

[0309] For example, the length of the channel sensing interval may be determined based on a priority value associated with SL data transmitted through the SL transmission.

[0310] According to one 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, which is operatively connected to the at least one processor and stores instructions, which cause the first UE to perform operations based on being executed by the at least one processor. For example, the operation may include: determining the length of the channel sensing interval; selecting at least one resource on an unlicensed band, wherein the time interval between at least one resource may be longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a starting time point of a first resource among the at least one resource to a starting time point of the first resource; and performing secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0311] According to one 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 cause a first device to: determine the length of a channel sensing interval; select at least one resource on an unlicensed frequency band, wherein the time interval between at least one resource may be longer than the length of the channel sensing interval; perform first channel sensing from a time point of the channel sensing interval before a start time point of a first resource among the at least one resource to a start time point of the first resource; and perform secondary link (SL) transmission using the first resource based on the result of the first channel sensing being idle.

[0312] Fig.18 A process of a second device performing wireless communication according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0313] Reference Fig.18 In step S1810, the second device may perform a sub-link (SL) reception based on the first resource on the unlicensed band. For example, based on the result of channel sensing being idle, SL data received through SL reception may be sent, and the channel sensing may be performed from a time point of a channel sensing interval before a start time point of a first resource among at least one resource on the unlicensed band to a start time point of the first resource, and the time interval between at least one resource may be longer than the length of the channel sensing interval.

[0314] For example, at least one resource may be contiguous in terms of time slots.

[0315] The above-mentioned embodiments can be applied to the following various devices. First, the processor 202 of the second device 200 can control the transceiver 206 to perform a sub-link (SL) reception based on the first resource on the unlicensed band. For example, based on the result of channel sensing being idle, SL data received through SL reception can be sent, and the channel sensing can be performed from a time point of a channel sensing interval before a starting time point of a first resource among at least one resource on the unlicensed band to a starting time point of the first resource, and the time interval between at least one resource can be longer than the length of the channel sensing interval.

[0316] 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 operatively 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 operation may include: performing a sub-link (SL) reception based on a first resource on an unlicensed band, wherein, based on the result of channel sensing being idle, SL data received through SL reception may be sent, wherein channel sensing may be performed from a time point of a channel sensing interval before a starting time point of a first resource among at least one resource on the unlicensed band to a starting time point of the first resource, and wherein the time interval between at least one resource may be longer than the length of the channel sensing interval.

[0317] For example, at least one resource may be contiguous in terms of time slots.

[0318] Various embodiments of the present disclosure may be combined with each other.

[0319] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0320] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described in this document may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0321] 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.

[0322] Fig.19 A communication system 1 according to an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0323] 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 with 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 (HMD), head up displays (HUD) 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.

[0324] 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, 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 LTE-M technology. In this case, as an example, LTE-M technology may be an example of LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, 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 IEEE 802.15.4, etc., and may be referred to as various names.

[0325] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing 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.

[0326] Wireless communication / connection 150a, 150b or 150c can be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Here, the wireless communication / connection can be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b can 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 the resource allocation process can be performed based on various proposals of the present disclosure.

[0327] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown. Fig. 20 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0328] Reference Fig. 20 , the first wireless device 100 and the second wireless device 200 may transmit radio signals through 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 BS200} and / or {wireless device 100x and wireless device 100x} in.

[0329] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may additionally further include one or more transceivers 106 and / or one or more antennas (antenna units) 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then 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, (one or more) memories 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 102 and (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 106 may be connected to (one or more) processors 102 and send and / or receive radio signals through (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceivers 106 may be used interchangeably with (one or more) radio frequency (RF) units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0330] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may additionally further include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit 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 a fourth information / signal 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, (one or more) memories 204 may store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods and / or operational flows disclosed in this document. Here, (one or more) processors 202 and (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceivers 206 may be connected to (one or more) processors 202 and transmit and / or receive radio signals through (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. (One or more) transceivers 206 may be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0331] 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 can 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 operating procedures disclosed in this document.

[0332] 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.

[0333] 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.

[0334] 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.

[0335] 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 invention can be combined with various embodiments of the present disclosure.

[0336] 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. 20 The 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 implemented by Fig. 20 The transceiver (106, 206) is used to implement box 1060.

[0337] 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).

[0338] 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.

[0339] 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.

[0340] Can be used with 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. 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.

[0341] 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 use cases / services (see Fig.19 ). Fig. 22 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0342] 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 an additional component 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 unit 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 the information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store the information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0343] 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 device ( Fig.19 100d), household appliances ( Fig.19 100e), IoT devices ( Fig.19 100f), digital broadcast terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.19 400), BS( Fig.19 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0344] 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 set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory unit 130 can be constructed by a random access memory (RAM), a dynamic RAM (DRAM), a read-only memory (ROM), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0345] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.18 .

[0346] Fig.23 A handheld device based on an embodiment of the present disclosure is shown. The handheld device may include a smart phone, a smart board, 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 invention can be combined with various embodiments of the present disclosure.

[0347] 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.

[0348] 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.

[0349] 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.

[0350] Fig.24 A vehicle or autonomous vehicle based on an embodiment of the present disclosure is shown. The vehicle or autonomous vehicle can 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 invention can be combined with various embodiments of the present disclosure.

[0351] 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. 22 Frame 110 / 130 / 140.

[0352] 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 when a destination is set, and the like.

[0353] 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.

[0354] The claims in this specification may be combined in various ways. For example, the technical features in the method claims of this specification may be combined to be implemented or performed in a device, and the technical features in the device claims may 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 may 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 may 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 the following steps: determining a length of a channel sensing interval; selecting at least one resource in the unlicensed frequency band, wherein the time interval between the at least one resource is longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a start time point of a first resource among the at least one resource to the start time point of the first resource; and Based on the result of the first channel sensing being idle, the secondary link SL transmission is performed using the first resource.

2. The method according to claim 1, wherein: The at least one resource is selected based on sensing.

3. The method according to claim 2, wherein: The sensing steps include: decoding the secondary link control information SCI received in the sensed target resource; and Based on the decoded SCI, resources that are expected to conflict are excluded from the candidate resources.

4. The method according to claim 1, wherein: The first channel sensing includes measuring energy within the channel sensing interval.

5. The method according to claim 1, wherein: The first channel sensing includes a Type 1 Listen-Before-Talk (LBT) operation.

6. The method according to claim 1, wherein: The first channel sensing includes a type 2 LBT operation.

7. The method according to claim 1, wherein: The at least one resource is a bursty resource.

8. The method according to claim 7, wherein: The at least one resource is contiguous in terms of time slots.

9. The method according to claim 7, further comprising the steps of: A resource subsequent to the second resource among the at least one resource is reselected as the at least one reselected resource.

10. The method according to claim 9, wherein: reselect all resources after the second resource, and The at least one reselected resource is continuous in terms of time slots.

11. The method according to claim 9, further comprising the steps of: performing second channel sensing from a time point of the channel sensing interval before a start time point of the second resource to the start time point of the second resource, The reselection is performed based on the result of sensing the second channel being busy.

12. The method according to claim 1, wherein: The length of the channel sensing interval is determined based on a priority class associated with SL data transmitted through the SL transmission.

13. The method according to claim 1, wherein: The length of the channel sensing interval is determined based on a priority value associated with SL data transmitted through the SL transmission.

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 operatively 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: determining a length of a channel sensing interval; selecting at least one resource in the unlicensed frequency band, wherein the time interval between the at least one resource is longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a start time point of a first resource among the at least one resource to the start time point of the first resource; and Based on the result of the first channel sensing being idle, the secondary link SL transmission is performed using the first resource.

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 operatively 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: determining a length of a channel sensing interval; selecting at least one resource in the unlicensed frequency band, wherein the time interval between the at least one resource is longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a start time point of a first resource among the at least one resource to the start time point of the first resource; and Based on the result of the first channel sensing being idle, the secondary link SL transmission is performed using the first resource.

16. A non-transitory computer-readable storage medium storing instructions, wherein the instructions, upon being executed, cause a first device to perform operations, the operations comprising: determining a length of a channel sensing interval; selecting at least one resource in the unlicensed frequency band, wherein the time interval between the at least one resource is longer than the length of the channel sensing interval; performing first channel sensing from a time point of the channel sensing interval before a start time point of a first resource among the at least one resource to the start time point of the first resource; and Based on the result of the first channel sensing being idle, the secondary link SL transmission is performed using the first resource.

17. A method for performing wireless communication by a second device, the method comprising the following steps: Performing a secondary link SL reception based on a first resource in the unlicensed band, wherein, based on the result of channel sensing being idle, the SL data received through the SL reception is sent, The channel sensing is performed from a time point of a channel sensing interval before a starting time point of the first resource among at least one resource on the unlicensed frequency band to the starting time point of the first resource, and The time interval between the at least one resource is longer than the length of the channel sensing interval.

18. The method according to claim 17, wherein: The at least one resource is contiguous in terms of time slots.

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 operatively 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: Performing a secondary link SL reception based on a first resource in the unlicensed band, wherein, based on the result of channel sensing being idle, SL data received through the SL reception is sent, The channel sensing is performed from a time point of a channel sensing interval before a starting time point of the first resource among at least one resource on the unlicensed frequency band to the starting time point of the first resource, and The time interval between the at least one resource is longer than the length of the channel sensing interval.

20. The second device according to claim 19, wherein: The at least one resource is contiguous in terms of time slots.

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