Method and device for operation of user equipment when disacting SL BWP in SL-u

Abstract

A method for a first device to perform wireless communication and an apparatus supporting the same are provided. The method may comprise the steps of: acquiring information related to a sidelink (SL) bandwidth portion (BWP); acquiring information related to a set of resource blocks (RBs) included in the SL BWP; performing listen before talk (LBT) for the RB set; detecting LBT failure for the RB set; triggering an LBT failure report process; and cancelling the triggered LBT failure reporting process based on the SL BWP being deactivated.

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). In this article, NR may also support vehicle-to-everything (V2X) communications. Summary of the invention

[0004] Technical Solution

[0005] In one embodiment, a method for performing wireless communication by a first device is provided. The method may include the following steps: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; performing listen before talk (LBT) for the RB set; detecting LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0006] In one embodiment, a first device configured to perform wireless communication is provided. The first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instructions cause the first device to perform operations based on being executed by at least one processor, the operations including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a set of resource blocks (RBs) included in the SL BWP; performing listen-before-talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0007] In one embodiment, a processing device configured to control a first device is provided. The processing device may include: at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instructions cause the first device to perform operations based on being executed by the at least one processor, the operations including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a set of resource blocks (RBs) included in the SL BWP; performing listen-before-talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0008] In one embodiment, a non-transitory computer-readable storage medium having recorded thereon instructions is provided. For example, the instructions, upon being executed, cause a first device to perform operations, the operations comprising: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; performing listen-before-talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A communication structure that may be provided in a 6G system according to an embodiment of the present disclosure is shown.

[0010] Figure 2 The electromagnetic spectrum is shown according to one embodiment of the present disclosure.

[0011] Figure 3 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0012] Figure 4A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0013] Figure 5 The structure of a radio frame of NR according to an embodiment of the present disclosure is shown.

[0014] Figure 6 The time slot structure of the NR frame according to an embodiment of the present disclosure is shown.

[0015] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0016] 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.

[0017] Fig. 9 Three broadcast types according to embodiments of the present disclosure are shown.

[0018] Fig.10 Interleaving RBs according to an embodiment of the present disclosure is shown.

[0019] Fig.11 An example of a wireless communication system supporting an unlicensed band according to an embodiment of the present disclosure is shown.

[0020] Fig.12 A method for occupying resources in an unlicensed frequency band based on an embodiment of the present disclosure is shown.

[0021] Fig.13 A case where a plurality of LBT-SBs are included in the unlicensed band according to an embodiment of the present disclosure is shown.

[0022] Fig.14 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.

[0023] Fig.15 A Type 1 CAP operation performed by a UE to transmit an uplink signal according to an embodiment of the present disclosure is shown.

[0024] Fig.16 The channel access process according to the embodiment of the present disclosure is shown.

[0025] Fig.17 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0026] Fig.18 A method for a second device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0027] Fig.19 A communication system 1 according to an embodiment of the present disclosure is shown.

[0028] Fig. 20 A wireless device according to an embodiment of the present disclosure is shown.

[0029] Fig.21 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0030] Fig. 22 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0031] Fig.23 A handheld device according to an embodiment of the present disclosure is shown.

[0032] Fig.24 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0033] 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".

[0034] 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".

[0035] 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".

[0036] 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".

[0037] 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".

[0038] In the following description, "when, if, or in the event of" may be replaced with "based on".

[0039] The technical features respectively described in a pair of drawings in the present disclosure may be implemented separately or simultaneously.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 6G (wireless communication) systems are designed for (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) lower energy consumption for battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system can have 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.

[0044] [Table 1]

[0045]

[0046]

[0047] The 6G system may have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), massive machine type communications (mMTC), AI-integrated communications, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0048] Figure 1 A communication structure that can be provided in a 6G system based on 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.

[0049] 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, providing end-to-end latency of less than 1ms. 6G systems will have better volume spectral efficiency compared to the more commonly used area spectral efficiency. 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. New network features in 6G may include the following.

[0050] -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.

[0051] -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 we will see later).

[0052] - 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.

[0053] -Ubiquitous Super 3D Connectivity: Access to network and core network functions from drones and very low Earth orbit satellites will enable ubiquitous Super 3D connectivity in 6G.

[0054] Based on the above new network characteristics of 6G, some common requirements may include

[0055] - 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 for communication systems beyond 5G (5Gb). Therefore, 6G communication systems will also adopt the characteristics of small cell network.

[0056] -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.

[0057] - 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.

[0058] - 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.

[0059] -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.

[0060] The following describes the key implementation technologies for 6G systems.

[0061] -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 enable AI for full 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 delivery. AI can use many analyses to determine how to perform complex target tasks, 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.

[0062] -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.

[0063] - Massive MIMO technology (Massive MIMO)

[0064] -Holographic Beamforming (HBF, Holographic Beamforming)

[0065] -Optical wireless technology

[0066] - Free Space Optical Backhaul Network (FSO Backhaul Network)

[0067] -Non-Terrestrial Network (NTN)

[0068] -Quantum communication

[0069] - No cell communication

[0070] -Integration of wireless information and power transmission

[0071] -Integration of wireless communication and sensing

[0072] -Integrated access and backhaul network

[0073] -Big Data Analysis

[0074] - Reconfigurable smart surfaces (Reconfigurable smart surfaces)

[0075] -Metaverse

[0076] -Blockchain

[0077] Unmanned Aerial Vehicle (UAV): Unmanned Aerial Vehicle (UAV) or drone will be an important part of 6G wireless communications. In most cases, UAV technology will be used to provide high-speed data wireless connectivity. 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 controlled mobility freedom). During emergencies such as natural disasters, the deployment of terrestrial telecommunication 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.

[0078] -Autonomous driving (autonomous driving, automated driving): For fully autonomous driving, vehicle-to-vehicle communication is required to notify each other of dangerous situations, and vehicle-to-vehicle communication with infrastructure such as parking lots and traffic lights is required to check information such as the location of parking information and signal change time. Vehicle-to-everything (V2X), a key element in building an autonomous driving infrastructure, is a technology that enables vehicles to communicate with various elements on the road and share information (e.g., vehicle-to-vehicle (V2V) wireless communication and vehicle-to-infrastructure (V2I) wireless communication) in order to perform autonomous driving. 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.

[0079] For the sake of clarity of description, 5G NR is mainly described, but the technical concept according to the embodiments of the present disclosure is not limited thereto. Various embodiments of the present disclosure may also be applicable to 6G communication systems.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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).

[0089] 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).

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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).

[0098] 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).

[0099] Table 2 shown below represents the number of symbols per slot (N) based on the SCS configuration (u) in the case of using a normal CP or an 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 ) example.

[0100] [Table 2]

[0101]

[0102] 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.

[0103] 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.

[0104] 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).

[0105] [Table 3]

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

[0107] 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).

[0108] [Table 4]

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

[0110] 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.

[0111] 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.).

[0112] 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.

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

[0114] 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.

[0115] 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 DL BWP other than an activated DL BWP 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 DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an unactivated DL BWP. For example, the UE may not send a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) other than an activated UL BWP. 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 DL BWP.To save energy, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the active BWP of the UE to the default BWP.

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

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

[0118] 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.

[0119] 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.

[0120] Hereinafter, V2X or SL communication will be described.

[0121] 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.

[0122] 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 pool, type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate PSBCH performance, in NR V2X, the payload size of PSBCH can be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0123] S-PSS, S-SSS, and PSBCH may be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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 the SL resources and / or information related to the UL resources to the first UE. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0128] For example, the first UE may receive information related to dynamic grant (DG) resources and / or information related to 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.

[0129] 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.

[0130] Hereinafter, an example of DCI format 3_0 will be described.

[0131] DCI format 3_0 is used to schedule NR PSCCH and NR PSSCH in one cell

[0132] The following information is sent by means of DCI format 3_0 with CRC scrambled by SL-RNTI or SL-CS-RNTI:

[0133] - Resource pool index - ceiling (log2I) bits, where I is the number of resource pools used for transmission configured by the upper layer parameter sl-TxPoolScheduling.

[0134] - Time gap - 3 bits determined by the upper layer parameter sl-DCI-ToSL-Trans

[0135] -HARQ process number - 4 bits

[0136] - New data indicator - 1 bit

[0137] - the lowest index of the subchannel assignment to the initial transmission - (log2(N SL subChannel ))Bit

[0138] -SCI format 1-A field: frequency resource assignment, time resource assignment

[0139] -PSFCH to HARQ feedback timing indicator -ceiling(log2 N fb_timing ) bits, where N fb_timing is the number of entries in the upper layer parameter sl-PSFH-ToPUCCH.

[0140] -PUCCH resource indicator - 3 bits

[0141] - Configuration Index - 0 bit if the UE is not configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI; otherwise, 3 bits. If the UE is configured to monitor DCI format 3_0 with CRC scrambled by SL-CS-RNTI, this field is reserved for DCI format 3_0 with CRC scrambled by SL-RNTI.

[0142] - Counter sublink assignment index - 2 bits, 2 bits if the UE is configured with pdsch-HARQ-ACK-codebook = dynamic, 2 bits if the UE is configured with pdsch-HARQ-ACK-codebook = semi-static.

[0143] - Padding bits, if needed

[0144] 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.

[0145] 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.

[0146] Hereinafter, an example of SCI format 1-A will be described.

[0147] SCI format 1-A is used for secondary SCI on PSSCH and scheduling of PSSCH.

[0148] The following information is sent with the help of SCI Format 1-A:

[0149] - Priority – 3 bits

[0150] - Frequency resource assignment - When the value of the upper layer parameter sl-MaxNumPerReserve is configured as 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the upper layer parameter sl-MaxNumPerReserve is configured as 3, ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits.

[0151] - Time Resource Assignment - 5 bits when the value of the upper layer parameter sl-MaxNumPerReserve is configured as 2; otherwise, 9 bits when the value of the upper layer parameter sl-MaxNumPerReserve is configured as 3

[0152] -Resource reservation period -ceiling(log2 N rsv_period ) bit, where if the upper layer parameter sl-MultiReserveResource is configured, then N rsv_period is the number of entries in the upper layer parameter sl-ResourceReservePeriodList; otherwise, 0

[0153] -DMRS mode -ceiling(log2 N pattern ) bits, where N pattern The number of DMRS patterns configured by the upper layer parameter sl-PSSCH-DMRS-TimePatternList

[0154] - Level 2 SCI format - 2 bits as defined in Table 5

[0155] - Beta_offset indicator - 2 bits provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0156] - Number of DMRS ports - 1 bit as defined in Table 6

[0157] - Modulation and coding scheme - 5 bits

[0158] - Additional MCS table indicator - 1 bit if one MCS table is configured through the upper layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured through the upper layer parameter sl-Additional-MCS-Table; otherwise, 0 bit.

[0159] -PSFCH overhead indication - 1 bit if the upper layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bit

[0160] - Reserved - The number of bits determined by the upper layer parameter sl-NumReservedBits, where the value is set to zero.

[0161] [Table 5]

[0162] The value of the second level SCI format field Second level SCI format 00 SCI Format 2-A 01 SCI Format 2-B 10 reserve 11 reserve

[0163] [Table 6]

[0164] The value of the DMRS Port Quantity field Antenna Port 0 1000 1 1000 and 1001

[0165] Hereinafter, an example of SCI format 2-A will be described.

[0166] When the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of the HARQ-ACK information, in the HARQ operation, SCI format 2-A is used for decoding of the PSSCH.

[0167] The following information is sent using SCI Format 2-A:

[0168] -HARQ process number – 4 bits

[0169] - New data indicator – 1 bit

[0170] - Redundancy version - 2 bits

[0171] - Source ID - 8 bits

[0172] -Destination ID - 16 bits

[0173] -HARQ feedback enable / disable indicator - 1 bit

[0174] - Broadcast Type Indicator - 2 bits as defined in Table 7

[0175] -CSI request - 1 bit

[0176] [Table 7]

[0177] The value of the broadcast type indicator Broadcast Type 00 broadcast 01 When the HARQ-ACK information includes ACK or NACK, multicast 10 Unicast 11 When the HARQ-ACK information includes only NACK, the multicast

[0178] Hereinafter, an example of SCI format 2-B will be described.

[0179] SCI format 2-B is used for decoding of the PSSCH, and when the HARQ-ACK information includes only NACK, or when there is no feedback of the HARQ-ACK information, a HARQ operation is used.

[0180] The following information is sent using SCI Format 2-B:

[0181] -HARQ process number - 4 bits

[0182] - New data indicator – 1 bit

[0183] - Redundancy version - 2 bits

[0184] - Source ID - 8 bits

[0185] -Destination ID - 16 bits

[0186] -HARQ feedback enable / disable indicator - 1 bit

[0187] - Region ID - 12 digits

[0188] -Communication range requirement - 4 bits determined by the upper layer parameter sl-ZoneConfigMCR-Index

[0189] 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.

[0190] Reference Figure 8 (a), in step S840, the first UE may send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0191] Fig. 9 Three types of broadcasts based on embodiments of the present disclosure are shown. Fig. 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig. 9 (a) shows a broadcast type SL communication, Fig. 9 (b) shows unicast type SL communication, and Fig. 9 (c) shows 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 may be replaced by SL multicast communication, SL one-to-many communication, etc.

[0192] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0193] For example, SL HARQ feedback may be enabled for unicast. In this case, in non-code block group (non-CBG) operation, if the receiving UE decodes the PSCCH that is targeted at the receiving UE, and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may generate a HARQ-ACK. In addition, the receiving UE may send a HARQ-ACK to the transmitting UE. Otherwise, if the receiving UE fails to successfully decode the transport block after decoding the PSCCH that is targeted at the receiving UE, the receiving UE may generate a HARQ-NACK. In addition, the receiving UE may send a HARQ-NACK to the transmitting UE.

[0194] For example, SL HARQ feedback may be enabled for multicast. For example, in non-CBG operation, two HARQ feedback options may be supported for multicast.

[0195] (1) Multicast Option 1: After the receiving UE decodes the PSCCH targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Otherwise, if the receiving UE decodes the PSCCH targeted at the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may not send a HARQ-ACK to the transmitting UE.

[0196] (2) Multicast Option 2: After the receiving UE decodes the PSCCH that is targeted at the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Alternatively, if the receiving UE decodes the PSCCH that is targeted at the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send a HARQ-ACK to the transmitting UE via the PSFCH.

[0197] For example, if multicast option 1 is used in SL HARQ feedback, all UEs performing multicast communication may share PSFCH resources. For example, UEs belonging to the same group may send HARQ feedback by using the same PSFCH resource.

[0198] For example, if multicast option 2 is used in SL HARQ feedback, each UE performing multicast communication may use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group may send HARQ feedback by using different PSFCH resources.

[0199] In the present disclosure, HARQ-ACK may be referred to as ACK, ACK information, or positive ACK information, and HARQ-NACK may be referred to as NACK, NACK information, or negative ACK information.

[0200] In various embodiments of the present disclosure, a transmitting UE and / or a receiving UE may obtain a discontinuous reception (DRX) configuration. For example, the DRX configuration may include a Uu DRX configuration and / or a SL DRX configuration. For example, the transmitting UE may receive the DRX configuration from a base station, and the receiving UE may receive the DRX configuration from the transmitting UE. For example, the DRX configuration may be configured or preconfigured for the transmitting UE and / or the receiving UE.

[0201] For example, the Uu DRX configuration may include information related to drx-HARQ-RTT-Timer-SL and / or information related to drx-RetransmissionTimer-SL. For example, the timer may be used for the following purposes.

[0202] (1) drx-HARQ-RTT-Timer-SL (per HARQ process): drx-HARQ-RTT-Timer-SL may be the minimum duration before the MAC entity expects a sidelink HARQ retransmission grant. drx-HARQ-RTT-Timer-SL may refer to the minimum time required until resources for SL mode 1 retransmission are prepared. That is, resources for sidelink retransmission cannot be prepared before the drx-HARQ-RTT-Timer-SL timer. Therefore, the sending UE may reduce power consumption by switching to sleep mode during the drx-HARQ-RTT-Timer-SL timer. Alternatively, the sending UE may not perform mode 1 DCI monitoring from the base station. If the drx-HARQ-RTT-Timer-SL timer expires, the sending UE may determine that resources can be prepared for SL retransmission. Therefore, the sending UE may start the drx-RetransmissionTimer-SL timer and monitor whether resources for SL HARQ retransmission are received. Once the drx-HARQ-RTT-Timer-SL timer expires, SL HARQ retransmission resources may or may not be received, so the sending UE may start the drx-RetransmissionTimer-SL timer, and the sending UE may monitor the mode 1 DCI from the base station to receive resources for SL HARQ retransmission. For example, the drx-HARQ-RTT-Timer-SL timer may be a duration during which a sending UE (e.g., a UE supporting Uu DRX operation) that performs side-link communication based on side-link resource allocation mode 1 does not perform PDCCH (or DCI) monitoring for side-link mode 1 resource allocation from the base station.

[0203] (2) drx-RetransmissionTimer-SL (per HARQ process): drx-RetransmissionTimer-SL can be the maximum duration until a permission for side-link retransmission is received. That is, the drx-RetransmissionTimer-SL timer can be a timer that is started when the drx-HARQ-RTT-Timer-SL timer expires, and can be a timer that allows the sending UE to transition to an active state for SL retransmission. Alternatively, while the corresponding timer is running, the sending UE can monitor the mode 1 DCI from the base station. The sending UE can start monitoring the SL mode 1 DCI from the base station to check whether retransmission resources (i.e., permission for side-link retransmission) are prepared to the receiving UE from the time when drx-RetransmissionTimer-SL starts. And, if retransmission resources are prepared, the sending UE can perform side-link HARQ retransmission to the receiving UE. When sending a HARQ retransmission packet to the receiving UE, the sending UE can stop the drx-RetransmissionTimer-SL timer. While the drx-RetransmissionTimer-SL timer is running, the UE may maintain an active state. For example, the drx-RetransmissionTimer-SL timer may be the duration for which a transmitting UE (e.g., a UE supporting Uu DRX operation) that performs secondary link communication based on secondary link resource allocation mode 1 performs PDCCH (or DCI) monitoring for secondary link mode 1 resource allocation from a base station.

[0204] For example, the SL DRX configuration may include at least one parameter / information among the parameters / information described below.

[0205] (1)SL drx-onDurationTimer: Duration when the SL DRX cycle starts

[0206] (2)SL drx-SlotOffset: Delay before starting sl drx-onDurationTimer

[0207] (3) SL drx-InactivityTimer: The duration after the PSCCH opportunity that the PSCCH indicates a new SL transmission for the MAC entity.

[0208] (4) SL drx-RetransmissionTimer (per HARQ process or per sublink process): Maximum duration until a retransmission is received

[0209] (5) SL drx-HARQ-RTT-Timer (per HARQ process or per sublink process): The minimum duration before the MAC entity expects PSSCH and PSCCH (sublink control information) for SL HARQ retransmissions

[0210] (6) SL drx-LongCycleStartOffset: long DRX cycle and drx-StartOffset, which define the subframes where the long DRX cycle and the short DRX cycle start.

[0211] (7)SL drx-ShortCycle (optional): short DRX cycle

[0212] (8)SL drx-ShortCycleTimer (optional): The duration of the short DRX cycle that the UE should follow

[0213] (9)SL drx-HARQ-RTT-Timer (per sub-link process): The minimum duration before the MAC entity expects an assignment for a HARQ retransmission

[0214] (10)SL drx-StartOffset: The subframe where the SL DRX cycle starts

[0215] (11)SL drx-Cycle: SL DRX cycle

[0216] The SL DRX timer described in this disclosure may be used for the following purposes.

[0217] (1) SL DRX On Duration Timer: The duration during which a UE performing SL DRX operation should operate substantially in the active time in order to receive PSCCH / PSSCH from other UEs

[0218] (2) SL DRX Inactivity Timer: a duration that extends the SL DRX on-duration, which is a duration that a UE performing a SL DRX operation should substantially operate in an active time in order to receive PSCCH / PSSCH from other UEs.

[0219] For example, the UE may extend the SL DRX On Duration timer by the SL DRX Inactivity timer duration. In addition, if the UE receives a new packet (eg, a new PSSCH transmission) from other UEs, the UE may extend the SL DRX On Duration timer by starting the SL DRX Inactivity timer.

[0220] For example, the SL DRX inactivity timer can be used to extend the SL DRX on duration, which is the duration during which a receiving UE performing SL DRX operation should operate substantially in active time in order to receive PSCCH / PSSCH from other UEs. That is, the SL DRX on duration timer can be extended by the SL DRX inactivity timer period. In addition, if the receiving UE receives a new packet (e.g., a new PSSCH transmission) from other transmitting UEs, the receiving UE can extend the SL DRX on duration timer by starting the SL DRX inactivity timer.

[0221] (3) SL DRX HARQ RTT timer: The duration during which a UE performing SL DRX operation operates in sleep mode until receiving a retransmission packet (or PSSCH assignment) sent by other UEs

[0222] For example, if the UE starts the SL DRX HARQ RTT timer, the UE can determine that other UEs will not send side-link retransmission packets to the UE until the SL DRX HARQ RTT timer expires, and the UE can operate in sleep mode while the corresponding timer is running. For example, if the UE starts the SL DRX HARQ RTT timer, the UE may not monitor side-link retransmission packets from other UEs until the SL DRX HARQ RTT timer expires. For example, if a receiving UE that has received the PSCCH / PSSCH sent by the sending UE sends a SL HARQ NACK feedback, the receiving UE can start the SL DRX HARQ RTT timer. In this case, the receiving UE can determine that other sending UEs will not send side-link retransmission packets to the receiving UE until the SL DRX HARQ RTT timer expires, and the receiving UE can operate in sleep mode while the corresponding timer is running.

[0223] (4) SL DRX retransmission timer: a timer started when the SL DRX HARQ RTT timer expires, and the duration during which a UE performing SL DRX operation operates in active time in order to receive retransmission packets (or PSSCH assignments) sent by other UEs.

[0224] For example, for the corresponding timer duration, the UE may receive or monitor retransmission sidelink packets (or PSSCH assignments) sent by other UEs. For example, while the SL DRX retransmission timer is running, the receiving UE may receive or monitor retransmission sidelink packets (or PSSCH assignments) sent by other transmitting UEs.

[0225] In the present disclosure, the names of timers (drx-HARQ-RTT-Timer-SL, drx-RetransmissionTimer-SL, sidelink DRX on duration timer, sidelink DRX inactivity timer, sidelink DRX HARQ RTT timer, sidelink DRX retransmission timer, etc.) are exemplary, and timers that perform the same / similar functions based on the contents described in each timer can be considered as the same / similar timers regardless of the name of the timer.

[0226] A UE operating in secondary link DRX may operate in active mode to perform PSCCH / PSSCH monitoring during the DRX active time (e.g., the on-duration timer, the inactivity timer, the retransmission timer, or the duration when operating in active mode). However, the UE may operate in sleep mode during the secondary link DRX inactivity duration and not perform PSCCH / PSSCH monitoring operations for SL data reception.

[0227] In side-link unicast, the UE can negotiate / determine the side-link DRX configuration (SL DRX configuration to be used during side-link unicast communication) with another UE with which a unicast connection has been established. If there is a connection (RRC connection) between the sending UE and the base station, the base station of the sending UE can configure the SL DRX configuration for use by the receiving UE that has established a unicast connection with the sending UE, and notify the sending UE, and the sending UE can send the SLDRX configuration received from the base station to be used by the receiving UE to the receiving UE via a PC5 RRC message. If there is no connection (RRC connection) between the sending UE and the base station, the sending UE can configure the SL DRX configuration for use by the receiving UE that has directly established a unicast connection with the sending UE, and send it to the receiving UE via a PC5 RRC message.

[0228] When SL DRX is an operation for a receiving UE, the sending UE also needs to know the SL DRX operation state of the receiving UE (active or sleep mode, or when the DRX on duration / inactivity / HARQ RTT / retransmission timer starts, when the DRX on duration / inactivity / HARQ RTT / retransmission timer expires, etc.). For example, when allocating and transmitting resources, the sending UE should be able to determine whether the receiving UE is operating in active mode or sleep mode. Therefore, the sending UE can apply the same SL DRX configuration as the receiving UE to maintain the same SL DRX timer operation state as the receiving UE, etc.

[0229] The AS layer of a UE (receiving UE or transmitting UE) that supports SL DRX behavior can receive a Tx profile mapped for an available side-link service from an upper layer (e.g., a V2X layer). The Tx profile may include information that distinguishes whether an available side-link service or a side-link service of interest is a side-link service that requires SL DRX operation. Therefore, when the AS layer of the UE receives available side-link data (or a side-link service of interest) and a Tx profile from an upper layer, the UE can decide (or determine) whether it should or should not support SL DRX operation for available side-link data (or a side-link service of interest).

[0230] 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.

[0231] On the other hand, a set of non-contiguous RBs (equally spaced) on frequency may be allocated to the UE. Such a set of non-contiguous RBs may be referred to as interleaved RBs. This may be useful in applying a spectrum (e.g., a shared spectrum) with provisions such as occupied channel bandwidth (OCB) and power spectral density (PSD).

[0232] Fig.10 Interleaving RBs according to an embodiment of the present disclosure is shown. Fig.10 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0233] Reference Fig.10 , multiple interlaces of RBs may be defined in the frequency domain. Interlace m∈{0, 1, . . . , M-1} may include (common) RBs {m, M+m, 2M+m, 3M+m, . . .}, where M represents the number of interlace RBs given in Table 8.

[0234] [Table 8]

[0235] u M 0 10 1 5

[0236] A communication device (e.g., a device, UE, vehicle, drone, etc. proposed in various embodiments of the present disclosure) may use one or more interleaved RBs to send a signal / channel.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] Hereinafter, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0241] Fig.11 An example of a wireless communication system supporting an unlicensed frequency band based on an embodiment of the present disclosure is shown. Fig.11 Unlicensed spectrum (NR-U) wireless communication systems may be included. Fig.11 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0242] 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.

[0243] like Fig.11 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.11 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.

[0244] exist Fig.11 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.

[0245] Unless otherwise stated, the following definitions apply to the following terms used in this disclosure.

[0246] - 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.

[0247] - 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).

[0248] - Channel occupancy: Transmission of the base station / UE on the channel after the channel access procedure.

[0249] - 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.

[0250] -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.

[0251] -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.

[0252] -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.

[0253] Fig.12 A method for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0254] Reference Fig.12 , 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.

[0255] Table 9 shows an example of a channel access procedure (CAP) supported in NR-U.

[0256] [Table 9]

[0257]

[0258]

[0259] Referring to Table 9, LBT types or CAPs for DL / UL / SL transmission may be defined. However, Table 9 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.

[0260] Hereinafter, an LBT-subband (SB) (or RB set) will be described.

[0261] 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.

[0262] Fig.13 A case where a plurality of LBT-SBs are included in the unlicensed 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.

[0263] Reference Fig.13 , 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.

[0264] Hereinafter, a channel access priority class (CAPC) will be described.

[0265] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0266] - Fixed to the lowest priority for filling buffer status report (BSR) and recommended bit rate MAC CE;

[0267] - For SRB0, SRB1, SRB3 and other MAC CEs, fixed to the highest priority;

[0268] -For SRB2 and DRB, configured by the base station.

[0269] 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 10 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.

[0270] [Table 10]

[0271]

[0272] 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.

[0273] The base station may perform one of the following channel access procedures (eg, CAP) for downlink signal transmission in the unlicensed band.

[0274] (1) Type 1 Downlink (DL) CAP method

[0275] 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:

[0276] - 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

[0277] - A transmission initiated by a base station comprises (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0278] Fig.14A 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.14 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0279] Reference Fig.14 , 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:

[0280] 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.

[0281] 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).

[0282] 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.

[0283] Step 4) (S130) If N=0 (Y), the base station terminates CAP (S132). Otherwise (N), proceed to step 2.

[0284] 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 d All time slots are detected as idle.

[0285] 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.

[0286] Table 11 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.

[0287] [Table 11]

[0288]

[0289] Referring to Table 11, 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 ).

[0290] 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 .

[0291] 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.

[0292] (2) Type 2 Downlink (DL) CAP Method

[0293] 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.

[0294] 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 Tf After a sensing time slot duration, the duration T f Includes a sensing slot at its beginning.

[0295] - A transmission initiated by a base station, comprising (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information, or

[0296] - Transmission by the base station after a gap of 25us from the transmission by the UE within the shared channel occupancy.

[0297] 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.

[0298] 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.

[0299] 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.

[0300] (1) Type 1 Uplink (UL) CAP method

[0301] In Type 1 UL CAP, the length of the duration spanned by the sensing slots sensed as idle before transmission is random. Type 1 UL CAP may be applied to the following transmissions.

[0302] -PUSCH / SRS transmission scheduled and / or configured by the base station

[0303] - PUCCH transmissions scheduled and / or configured by the base station

[0304] - Transmissions related to the Random Access Procedure (RAP)

[0305] Fig.15A Type 1 CAP operation performed by a UE to transmit an uplink signal according to an 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.

[0306] Reference Fig.15 , 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:

[0307] 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.

[0308] Step 2) (S240) If N>0 and the UE determines to decrease the counter, the UE sets N to N-1 (N=N-1).

[0309] 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.

[0310] Step 4) (S230) If N=0 (Y), the UE terminates the CAP (S132). Otherwise (N), proceed to step 2.

[0311] 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 d All time slots are detected as idle.

[0312] 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.

[0313] Table 12 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.

[0314] [Table 12]

[0315]

[0316] Referring to Table 12, 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 ).

[0317] 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 .

[0318] 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.

[0319] (2) Type 2 Uplink (UL) CAP method

[0320] In a 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 UL CAP is classified as Type 2A / 2B / 2C UL CAP. In a Type 2A UL CAP, the UE can determine the duration of the sensing slot that is sensed as idle before transmission 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 2A UL CAP, T fIn a Type 2B UL CAP, the UE may sense the channel during the sensing duration T. f = Transmission is performed immediately after being sensed as idle within 16us. In Type 2B UL CAP, T f The sensing slot within 9us from the end of the duration is included. In Type 2C UL CAP, the UE does not perform channel sensing before performing transmission.

[0321] 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 For example, the UE may select a backoff counter (BC) after selecting a random value between 0 and CW (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. For example, if the UE d (T d =T f +m p *T sl ) detects that the channel is idle within 1 second, then decreases BC by 1. When BC becomes zero, the UE may attempt to send data by occupying the channel. For example, if the UE detects a conflict when it attempts to send data, it may increase the contention window size (CW size) mapped to the CAPC. In addition, the UE may reselect a random value for a backoff count between 0 and CW, reselecting a random value with an increased CW. For example, if the UE successfully performs packet transmission, the contention window (CW size) may be initialized to a default value mapped to the initial CAPC. For example, T 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 For example, m p can be a constant per CAPC mapping and is used to calculate T d For example, as the CAPC value decreases (or the priority increases), m p can be mapped to a smaller value.

[0322] 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 2A LBT, Type 2B LBT, or Type 2C LBT) within the COT.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] Fig.16 The channel access process based on the embodiment of the present disclosure is shown. Specifically, Fig.16 (a) shows an example of a dynamic channel access process (load-based equipment, LBE), and Fig.16 (b) shows an example of a semi-static channel access procedure (frame-based equipment, FBE). Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0328] Reference Fig.16(a), if the channel is idle, the UE can compete with other UEs in the unlicensed band to immediately occupy the channel. In addition, if the UE occupies the channel, the UE can send data.

[0329] Reference Fig.16 (b), the UE may perform contention with other UEs on the unlicensed band at the last time within the synchronization frame boundary (or fixed frame period (FFP)) (e.g., a specific time before the start (or start time) of the next FFP). In addition, if the UE occupies the channel within the fixed frame period (FFP), the UE may send data. Data transmission should be completed before the start of the next FFP.

[0330] In addition, in the secondary link unlicensed spectrum (SL-U), if the UE fails to perform listen-before-talk (LBT) performed to occupy a channel, the UE may report the LBT failure to the base station by triggering a process of reporting the LBT failure to the base station. However, if the process for reporting the LBT failure is triggered even if the secondary link bandwidth part (SL BWP) including the channel is deactivated, the UE may waste power or resources of the UE on an unnecessary reporting process.

[0331] In SL-U, the UE should first occupy a channel in the unlicensed band of the secondary link to send SL data. For example, the UE may perform an LBT process (e.g., Type 1 LBT: LBT based on random backoff) to occupy a channel of the unlicensed secondary link, and perform a process of finding channels that are not occupied by surrounding UEs. For example, if a UE performing LBT finds a channel that is not occupied by other UEs, the UE may occupy the channel and send SL data. For example, if the UE has performed Type 1 LBT but the channel is busy, the UE's physical (PHY) layer may report an LBT failure indication to the medium access control (MAC) layer.

[0332] In the present disclosure, an operation of a UE when LBT of the UE fails (eg, a process of finding an unoccupied channel fails) is proposed as follows.

[0333] In the prior art, the side link communication only supports operations in one SL BWP (side link bandwidth part). In the present disclosure, the operation of the UE when the SL BWP (side link bandwidth part) is deactivated is proposed as follows. For example, a UE performing side link communication can perform contention-based side link communication on a side link unlicensed spectrum. For example, the UE can occupy a channel for performing contention-based side link communication on an unlicensed spectrum. For example, the UE can occupy a channel in an unlicensed spectrum to send side link data. For example, the UE can perform a process of checking whether the channel is idle or busy by performing a type 1 LBT for occupying a channel in an unlicensed spectrum. For example, if the UE determines that the channel is idle through a type 1 LBT process, it can occupy the channel and send side link data on the channel. For example, if the physical (PHY) layer of the UE does not find an idle channel when performing a type 1 LBT process, it can transmit an LBT failure indication to the medium access control (MAC) layer of the UE. For example, when the MAC layer receives an LBT failure up to a maximum threshold number from the PHY layer, it can trigger an LBT failure report and send an LBT failure report.

[0334] That is, the UE should basically perform the LBT procedure for secondary link data transmission in the secondary link unlicensed band.

[0335] In the present disclosure, an operation and apparatus are proposed that allow a UE to cancel a triggered secondary link LBT failure report when a SL BWP is deactivated and a secondary link LBT failure report for a secondary link unlicensed band operation exists in the deactivated SLBWP.

[0336] That is, when SL BWP is deactivated, the UE may perform the following operations.

[0337] The MAC entity can be configured with at most a single SL BWP in which sidelink transmission and reception are performed.

[0338] For BWP, the MAC entity can perform the following operations:

[0339] 1> If BWP is disabled

[0340] 2> If configured, SL-BCH (Secondary Link-Broadcast Channel) may not be sent on BWP;

[0341] 2> If configured, S-PSS (Secondary Link-Primary Synchronization Signal) and S-SSS (Secondary Link-Secondary Synchronization Signal) may not be sent on BWP;

[0342] 2> PSCCH (Physical Secondary Link Control Channel) may not be sent on BWP;

[0343] 2> SL-SCH (Secondary Link-Shared Channel) may not be sent on BWP;

[0344] 2> If configured, PSFCH (Physical Sidelink Feedback Channel) may not be received on BWP;

[0345] 2> If configured, SL-BCH (Secondary Link-Broadcast Channel) can be received on BWP;

[0346] 2> If configured, S-PSS (Secondary Link-Primary Synchronization Signal) and S-SSS (Secondary Link-Secondary Synchronization Signal) may not be received on BWP;

[0347] 2> PSCCH (Physical Secondary Link Control Channel) may not be received on BWP;

[0348] 2> SL-SCH (Secondary Link-Shared Channel) may not be received on BWP;

[0349] 2> If configured, PSFCH (Physical Sidelink Feedback Channel) may not be sent on BWP;

[0350] 2> Any configured secondary link license of configuration license type 1 can be suspended;

[0351] 2> Any configured secondary link permissions of configuration permission type 2 can be cleared;

[0352] 2> The triggered scheduling request process for the secondary link (if any) may be canceled;

[0353] 2> The triggered secondary link buffer status reporting process (if any) can be canceled;

[0354] 2> The triggered secondary link CSI (channel state information) reporting process (if any) can be canceled;

[0355] 2> The triggered secondary link LBT failure reporting process (if any) can be canceled;

[0356] The proposal of the present disclosure may generally be applicable to both initial transmission resource selection and retransmission resource selection. Alternatively, the proposal of the present disclosure may specifically only be applicable to initial transmission resource selection. Alternatively, the proposal of the present disclosure may specifically only be applicable to retransmission resource selection.

[0357] The proposal of the present disclosure may be a solution that can be equally applied not only to the operation of requesting COT sharing but also to the case where a UE requests frame-based equipment (FBE) configuration information (e.g., fixed frame period (FFP) information, FFP start offset) from a peer UE.

[0358] A channel specified in the present disclosure may be applied by replacing a carrier, a resource block (RB) set of a specific carrier, or a frequency band.

[0359] For example, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be configured (differently or independently) for each SL channel access priority category (CAPC). For example, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be configured (differently or independently) for each SL-LBT type (e.g., type 1 LBT, type 2A LBT, type 2B LBT, type 2C LBT). For example, depending on whether frame-based LBT is applied, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be specifically (or differently or independently) configured. For example, depending on whether load-based LBT is applied, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be specifically (or differently or independently) configured.

[0360] For example, it is possible to configure (differently or independently) for each resource pool whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, it is possible to configure (differently or independently) for each congestion level whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, it is possible to configure (differently or independently) for each service priority whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, it is possible to configure (differently or independently) for each service type whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, it is possible to configure (differently or independently) for each QoS requirement (e.g., latency, reliability) whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, it is possible to configure (differently or independently) for each PQI (5G QoS Identifier (5QI) for PC5) whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure. For example, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be configured (differently or independently) for each service type (e.g., periodic generation or non-periodic generation). For example, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be configured (differently or independently) for each SL transmission resource allocation mode (e.g., mode 1 or mode 2). For example, whether to apply (some) of the methods / rules and / or related parameters (e.g., thresholds) proposed in the present disclosure may be configured (differently or independently) for each Tx profile (e.g., a Tx profile indicating that the service supports sub-link DRX operation or a Tx profile indicating that the service does not need to support sub-link DRX operation).

[0361] For example, depending on whether PUCCH configuration is supported (for example, when PUCCH resources are configured or when PUCCH resources are not configured), it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied. For example, it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied for each resource pool (for example, a resource pool with PSFCH or a resource pool without PSFCH). For example, it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied for each service / packet type. For example, it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied for each service / packet priority. For example, it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied for each QoS requirement (for example, URLLC / EMBB service, reliability, delay). For example, it is possible to configure (differently or independently) whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied for each PQI. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured for each PFI (differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured for each broadcast type (e.g., unicast, multicast, broadcast) (differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured for each (resource pool) congestion level (e.g., CBR) (differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured for each SL HARQ feedback option (e.g., only NACK feedback, ACK / NACK feedback) (differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be specifically (or differently or independently) configured for MAC PDU transmission with HARQ feedback enabled. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be specifically (or differently or independently) configured for MAC PDU transmission with HARQ feedback disabled (or differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be specifically (or differently or independently) configured according to whether a PUCCH-based SL HARQ feedback report operation is configured. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be specifically (or differently or independently) configured for preemption or according to whether a resource reselection based on preemption is performed. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be specifically (or differently or independently) configured for reassessment or according to whether a resource reselection based on reassessment is performed.For example, it is possible to configure (differently or independently) whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure for each (L2 or L1) (source and / or destination) identifier. For example, it is possible to configure (differently or independently) whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure for each (L2 or L1) (combination of source ID and destination ID) identifier. For example, it is possible to configure (differently or independently) whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure for each (L2 or L1) (combination of a pair of source ID and destination ID and broadcast type) identifier. For example, it is possible to configure (differently or independently) whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure for each direction in a pair of source layer ID and destination layer ID. For example, it is possible to configure (differently or independently) whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure for each PC5 RRC connection / link. For example, depending on whether SL DRX is performed, it is possible to specifically (or differently or independently) configure whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure. For example, depending on whether SLDRX is supported, whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied can be specifically (or differently or independently) configured. For example, whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied can be configured (differently or independently) for each SL mode type (e.g., resource allocation mode 1 or resource allocation mode 2). For example, whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied can be specifically (or differently or independently) configured for the case of performing (non-) periodic resource reservation. For example, whether the proposed rules and / or related parameter configuration values ​​of the present disclosure are applied can be specifically (or differently or independently) configured for each Tx profile (e.g., a Tx profile indicating that the service supports the side link DRX operation or a Tx profile indicating that the service does not need to support the side link DRX operation).

[0362] It is proposed and whether to apply the proposed rules (and / or related parameter configuration values) of the present disclosure may also be applied to mmWave SL operations.

[0363] According to various embodiments of the present disclosure, even if the UE triggers a process for reporting LBT failure to the base station when the UE fails to perform LBT on the secondary link unlicensed spectrum (SL-U), if the SL BWP is deactivated, the UE can cancel the reporting process. Therefore, by omitting unnecessary reporting processes, the UE can avoid wasting UE power or resources.

[0364] Fig.17 A method for a first device to perform wireless communication based on 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.

[0365] Reference Fig.17 , in step S1710, the first device may obtain information related to a secondary link (SL) bandwidth part (BWP). In step S1720, the first device may obtain information related to a set of resource blocks (RBs) included in the SL BWP. In step S1730, the first device may perform listen before talk (LBT) for the RB set. In step S1740, the first device may detect a failure of LBT for the RB set. In step S1750, the first device may trigger an LBT failure reporting procedure. In step S1760, the first device may cancel the triggered LBT failure reporting procedure based on the SL BWP being deactivated.

[0366] For example, LBT may be performed based on a random backoff.

[0367] For example, the first device may perform LBT by sensing whether the RB set is idle or busy for a specific number of times, wherein the specific number of times may be randomly selected. For example, based on information related to a channel access priority class (CAPC) mapped to data to be sent by the first device, a specific number of times may be randomly selected. For example, the information related to the CAPC may include information related to the size of the contention window, and the information related to the size of the contention window may include information related to the minimum size of the contention window and information related to the maximum size of the contention window. For example, a random integer selected between 0 and a value related to the contention window may be a specific number of times. For example, a value related to the contention window may be randomly selected between the minimum size of the contention window and the maximum size of the contention window. For example, based on determining that the RB set is busy, an LBT failure indication may be transmitted from a lower layer to an upper layer. For example, an LBT failure may be detected based on the number of LBT failures reaching a maximum threshold. For example, each time an LBT failure indication may be transmitted from an upper layer to an upper layer, the number of LBT failures is incremented by 1. For example, an LBT failure may be transmitted from a lower layer to an upper layer based on an LBT failure indication reaching a maximum threshold.

[0368] For example, the LBT failure reporting process may be a process of sending information for reporting LBT failure to a base station.

[0369] For example, based on the LBT failure reporting process being canceled, information for reporting LBT failure may not be sent to the base station.

[0370] For example, the SL BWP may be deactivated based on a parameter set of an activated uplink (UL) BWP being different from a parameter set of the SL BWP.

[0371] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 can control the transceiver 160 to obtain information related to the secondary link (SL) bandwidth part (BWP). And, the processor 102 of the first device 100 can control the transceiver 160 to obtain information related to the resource block (RB) set included in the SL BWP. And, the processor 102 of the first device 100 can perform listen before talk (LBT) for the RB set. And, the processor 102 of the first device 100 can detect an LBT failure for the RB set. And, the processor 102 of the first device 100 can trigger an LBT failure reporting process. And, the processor 102 of the first device 100 can cancel the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0372] According to one embodiment of the present disclosure, a first device configured to perform wireless communication is provided. The first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instruction causes the first device to perform an operation based on being executed by at least one processor, the operation including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; performing listen before talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0373] According to one embodiment of the present disclosure, a first device configured to perform wireless communication is provided. The first device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instruction causes the first device to perform an operation based on being executed by at least one processor, the operation including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; performing listen before talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0374] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having recorded thereon instructions is provided. For example, the instructions, based on being executed, cause a first device to perform operations, the operations including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; performing listen-before-talk (LBT) for the RB set; detecting an LBT failure for the RB set; triggering an LBT failure reporting process; and canceling the triggered LBT failure reporting process based on the SL BWP being deactivated.

[0375] Fig.18 A method for a second device to perform wireless communication based on 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.

[0376] Reference Fig.18 In step S1810, the second device may obtain information related to a secondary link (SL) bandwidth part (BWP). In step S1820, the second device may obtain information related to a resource block (RB) set included in the SL BWP. In step S1830, the second device may request information related to a channel occupation time (COT) from the first device.

[0377] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 202 of the second device 200 can control the transceiver 260 to obtain information related to the secondary link (SL) bandwidth part (BWP). And, the processor 202 of the second device 200 can control the transceiver 260 to obtain information related to the resource block (RB) set included in the SL BWP. And, the processor 202 of the second device 200 can control the transceiver 260 to request information related to the channel occupancy time (COT) from the first device. For example, the LBT failure reporting process of the first device triggered by the failure of listen-before-talk (LBT) for the RB set can be canceled based on the SL BWP being deactivated.

[0378] According to one embodiment of the present disclosure, a second device configured to perform wireless communication is provided. The second device may include: at least one transceiver; at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instruction causes the second device to perform an operation based on being executed by at least one processor, the operation including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a set of resource blocks (RBs) included in the SL BWP; and requesting information related to a channel occupancy time (COT) from the first device. For example, the LBT failure reporting process of the first device triggered by a listen-before-talk (LBT) failure for a set of RBs can be canceled based on the SL BWP being deactivated.

[0379] According to one embodiment of the present disclosure, a processing device configured to control a second device is provided. The processing device may include: at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions. For example, the instructions cause the second device to perform an operation based on being executed by at least one processor, the operation including: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a set of resource blocks (RBs) included in the SLBWP; and requesting information related to a channel occupancy time (COT) from a first device. For example, the LBT failure reporting process of the first device triggered by a listen-before-talk (LBT) failure for a set of RBs may be canceled based on the SL BWP being deactivated.

[0380] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having recorded thereon instructions is provided. For example, the instructions, based on being executed, cause a second device to perform an operation, the operation comprising: obtaining information related to a secondary link (SL) bandwidth part (BWP); obtaining information related to a resource block (RB) set included in the SL BWP; and requesting information related to a channel occupancy time (COT) from a first device. For example, a listen-before-talk (LBT) failure reporting process of the first device triggered by a listen-before-talk (LBT) failure for a set of RBs may be canceled based on the SL BWP being deactivated.

[0381] Various embodiments of the present disclosure may be combined with each other.

[0382] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0383] 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).

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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.

[0400] 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).

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] 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.

[0406] 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.

[0407] 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.

[0408] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.18 .

[0409] 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.

[0410] 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.

[0411] 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.

[0412] 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.

[0413] 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.

[0414] 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.

[0415] 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.

[0416] 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.

[0417] 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: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; Performing listen-before-talk LBT on the RB set; Detecting a failure of LBT for the set of RBs; Trigger the LBT failure reporting process; as well as Based on the SL BWP being deactivated to cancel the triggered LBT failure reporting process.

2. The method according to claim 1, wherein: The LBT is performed based on random backoff.

3. The method according to claim 1, wherein: The first device performs the LBT by sensing whether the RB set is idle or busy for a specific number of times, and Wherein, the specific number of times is selected randomly.

4. The method according to claim 3, wherein: The specific number of times is randomly selected based on information related to a channel access priority class CAPC mapped to data to be sent by the first device.

5. The method according to claim 4, wherein: The information related to the CAPC includes information related to the size of a contention window, and The information related to the size of the contention window includes information related to a minimum size of the contention window and information related to a maximum size of the contention window.

6. The method according to claim 5, wherein: A random integer selected between 0 and a value associated with the contention window is the specific number.

7. The method according to claim 6, wherein: The value associated with the contention window is randomly selected between the minimum size of the contention window and the maximum size of the contention window.

8. The method according to claim 3, wherein: Based on determining that the RB set is busy, an LBT failure indication is transmitted from the lower layer to the upper layer.

9. The method according to claim 1, wherein: The LBT failure is detected based on the number of LBT failures reaching a maximum threshold.

10. The method according to claim 9, wherein: Each time an LBT failure indication is transmitted from the lower layer to the upper layer, the number of LBT failures is incremented by 1.

11. The method according to claim 10, wherein: The LBT failure is based on the LBT failure indication being transmitted from the lower layer to the upper layer reaching the maximum threshold.

12. The method according to claim 1, wherein: The LBT failure reporting process is a process of sending information for reporting the LBT failure to a base station.

13. The method according to claim 1, wherein: Based on the LBT failure reporting process being cancelled, information for reporting the LBT failure is not sent to the base station.

14. A first device adapted to perform wireless communication, the first device comprising: at least one transceiver; at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions, upon being executed, causing the first device to perform operations, the operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; Performing listen-before-talk LBT on the RB set; Detecting a failure of LBT for the set of RBs; triggering the LBT failure reporting process; and Based on the SL BWP being deactivated to cancel the triggered LBT failure reporting process.

15. A processing device adapted to control a first device to perform wireless communication, the processing device comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions upon being executed causing the at least one processor to perform operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; Performing listen-before-talk LBT on the RB set; Detecting a failure of LBT for the set of RBs; triggering the LBT failure reporting process; and Based on the SL BWP being deactivated to cancel the triggered LBT failure reporting process.

16. A non-transitory computer-readable storage medium having recorded thereon instructions, the instructions, when executed, causing a first device to perform operations, the operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; Performing listen-before-talk LBT on the RB set; Detecting a failure of LBT for the set of RBs; Trigger the LBT failure reporting process; as well as Based on the SL BWP being deactivated to cancel the triggered LBT failure reporting process.

17. A method for performing wireless communication by a second device, the method comprising the following steps: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; as well as requesting information related to the channel occupancy time COT from the first device, Wherein, the SL BWP is deactivated to cancel the LBT failure reporting process of the first device that is triggered by the listen-before-talk LBT failure for the RB set.

18. A second device adapted to perform wireless communication, the second device comprising: at least one transceiver; at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions, upon being executed, causing the second device to perform operations, the operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; obtaining information related to a resource block (RB) set included in the SL BWP; and requesting information related to the channel occupancy time COT from the first device, Wherein, the SL BWP is deactivated to cancel the LBT failure reporting process of the first device that is triggered by the listen-before-talk LBT failure for the RB set.

19. A processing device adapted to control a second device to perform wireless communication, the processing device comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions upon being executed causing the at least one processor to perform operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; obtaining information related to a resource block (RB) set included in the SL BWP; and requesting information related to the channel occupancy time COT from the first device, Wherein, the SL BWP is deactivated to cancel the LBT failure reporting process of the first device triggered by the listen-before-talk LBT failure for the RB set.

20. A non-transitory computer-readable storage medium having recorded thereon instructions, the instructions, when executed, causing a second device to perform operations, the operations comprising: Obtaining information related to the secondary link SL bandwidth part BWP; Obtaining information related to a set of resource blocks (RBs) included in the SL BWP; as well as requesting information related to the channel occupancy time COT from the first device, Wherein, the SL BWP is deactivated to cancel the LBT failure reporting process of the first device that is triggered by the listen-before-talk LBT failure for the RB set.

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