Method and apparatus for performing wireless communication related to lbt

Abstract

A method in which a first device performs wireless communication and a device supporting the same are presented. For example, a first device may obtain information related to a set of resources within a shared spectrum. For example, a first device may perform SL LBT with respect to a set of resources within a shared spectrum. For example, the first device may trigger a consistent SL LBT failure based on a counter associated with the failure of the SL LBT reaching a threshold. For example, in an LCP process, a priority of a first MAC CE for indicating a consistent SL LBT failure may be lower than or equal to a priority of a second MAC CE for indicating a consistent Uu LBT failure.

Description

Technical Field

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

[0002] Sidelink (SL) is a communication method that configures a direct link 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.

[0003] 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.

[0004] In addition, as more and more communication devices require greater communication capacity, the demand for enhanced mobile broadband communications relative to previous radio access technologies (RATs) is rising. Therefore, communication systems for reliability and latency-sensitive services or user equipment (UE) are discussed. In addition, the next generation of radio access technologies based on improved mobile broadband communications, massive machine type communications (MTC), ultra-reliable low-latency communications (URLLC), etc. can be referred to as new radio access technologies (RATs) or new radios (NRs). In this article, NR can also support vehicle-to-everything (V2X) communications. Summary of the invention

[0005] Technical Solution

[0006] According to an embodiment of the present disclosure, a method for performing wireless communication by a first device may be provided. For example, the first device may obtain information related to a resource set in a shared spectrum. For example, the first device may perform a sidelink (SL) listen-before-talk (LBT) with respect to a resource set in a shared spectrum. For example, the first device may trigger a consistent SL LBT failure based on a counter related to a failure of the SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, a priority of a first media access control (MAC CE) for indicating a consistent SL LBT failure may be less than or equal to a priority of a second MAC CE for indicating a consistent Uu LBT failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A communication structure that can be provided in a 6G system based on an embodiment of the present disclosure is shown.

[0008] Figure 2 The electromagnetic spectrum according to an embodiment of the present disclosure is shown.

[0009] Figure 3 The structure of the NR system based on the embodiment of the present disclosure is shown.

[0010] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown.

[0011] Figure 5 The structure of the radio frame of NR based on the embodiment of the present disclosure is shown.

[0012] Figure 6 The structure of the time slot of the NR frame based on the embodiment of the present disclosure is shown.

[0013] Figure 7 An example of a BWP according to an embodiment of the present disclosure is shown.

[0014] 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.

[0015] Fig. 9 Three cast types based on embodiments of the present disclosure are shown.

[0016] Fig.10 An example of a wireless communication system supporting a license-free band according to an embodiment of the present disclosure is shown.

[0017] Fig.11 A method for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown.

[0018] Fig.12 A case in which a plurality of LBT-SBs are included in a license-exempt band according to an embodiment of the present disclosure is shown.

[0019] Fig.13 A CAP operation performed by a base station to transmit a downlink signal through an unlicensed frequency band according to an embodiment of the present disclosure is shown.

[0020] Fig.14 A Type 1 CAP operation performed by a UE to transmit an uplink signal according to an embodiment of the present disclosure is shown.

[0021] Fig.15 The channel access process according to the embodiment of the present disclosure is shown.

[0022] Fig.16 A process for performing wireless communication related to LBT based on an embodiment of the present disclosure is shown.

[0023] Fig.17 A method for performing wireless communication related to LBT based on an embodiment of the present disclosure is shown.

[0024] Fig.18 A method for a first device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0025] Fig.19 A method for a second device to perform wireless communication based on an embodiment of the present disclosure is shown.

[0026] Fig. 20 A communication system 1 according to an embodiment of the present disclosure is shown.

[0027] Fig.21 A wireless device according to an embodiment of the present disclosure is shown.

[0028] Fig. 22 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown.

[0029] Fig.23 Another example of a wireless device according to an embodiment of the present disclosure is shown.

[0030] Fig.24 A handheld device according to an embodiment of the present disclosure is shown.

[0031] Fig.25 A vehicle or autonomous vehicle according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0032] 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".

[0033] 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".

[0034] 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".

[0035] 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".

[0036] 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".

[0037] In the following description, "when, if, or in the event of" may be replaced with "based on".

[0038] The technical features respectively described in one drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

[0039] In the present disclosure, the higher layer parameter may be a parameter configured, preconfigured or predefined for the UE. For example, the base station or the network may send the higher layer parameter to the UE. For example, the higher layer parameter may be sent via radio resource control (RRC) signaling or media access control (MAC) signaling.

[0040] 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.

[0041] 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.

[0042] The 6G (wireless communication) system has objectives such as (i) very high data rates per device, (ii) very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption of battery-free IoT devices, (vi) ultra-reliable connectivity, and (vii) networked intelligence with machine learning capabilities. The vision of the 6G system may include four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system may meet the requirements shown in Table 1 below. That is, Table 1 shows the requirements of the 6G system.

[0043] [Table 1]

[0044] Peak data rate per device 1Tbps E2E Latency 1ms Maximum spectral efficiency 100bps / Hz Mobility support Up to 1000km / h Satellite Integration Completely AI Completely Autonomous Vehicles Completely XR Completely Tactile communication Completely

[0045] The 6G system may have key factors such as enhanced mobile broadband (eMBB), ultra-reliable and 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.

[0046] 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 invention can be combined with various embodiments of the present disclosure.

[0047] The 6G system will have 50 times higher simultaneous wireless communication connectivity than the 5G wireless communication system. URLLC, which is the main function of 5G, will become a more important technology by providing an end-to-end delay of less than 1ms in 6G communication. Unlike the frequently used domain spectrum efficiency, the 6G system can have better volume spectrum efficiency. The 6G system can provide advanced battery technology for energy harvesting and very long battery life, and therefore mobile devices may not need to be charged separately in the 6G system. In 6G, new network characteristics may be as follows.

[0048] -Satellite-integrated network: To provide global mobile constellations, 6G will be integrated with satellites. Integrating ground waves, satellites, and public networks into one wireless communication system could be very important for 6G.

[0049] -Connected Intelligence: Unlike previous generations of wireless communication systems, 6G is innovative, and wireless evolution may be updated from "connected things" to "connected intelligence." AI can be applied in every step of the communication process (or every signal processing process described below).

[0050] - Seamless integration of wireless information and energy transfer: 6G wireless networks can transfer power to facilitate charging the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0051] -Ubiquitous hyper-3D connectivity: Access to networks and core network functions from drones and very low earth orbit satellites will establish hyper-3D connectivity in 6G ubiquity.

[0052] Among the new network features of 6G, several general requirements are as follows.

[0053] - Small cell network: The concept of small cell network is introduced to improve the received signal quality as a result of the improvement of the throughput, energy efficiency and spectrum efficiency of the cellular system. Therefore, the small cell network is an essential feature of the 5G and beyond 5G (5GB) communication system. Therefore, the 6G communication system also adopts the characteristics of the small cell network.

[0054] -Ultra-dense heterogeneous network: Ultra-dense heterogeneous network will be another important feature of 6G communication system. Multi-tier network composed of heterogeneous networks improves overall QoS and reduces costs.

[0055] - High Capacity Backhaul: Backhaul connections are characterized by high capacity backhaul networks in order to support high capacity traffic. High speed optical fiber and free space optics (FSO) systems can be possible solutions to this problem.

[0056] - Radar technology integrated with mobile technology: High-precision positioning (or location-based services) through communication is one of the functions of 6G wireless communication systems. Therefore, radar systems will be integrated with 6G networks.

[0057] -Software and virtualization: Software and virtualization are two important functions that are the basis of the design process in 5GB networks in order to ensure flexibility, reconfigurability and programmability.

[0058] The core implementation technology of the 6G system is described below.

[0059] - Artificial Intelligence (AI): As the most important and newly introduced technology in 6G system is AI. AI is not involved in 4G system. 5G system will support partial or very limited AI. However, 6G system will support AI for full automation. Advances in machine learning will create smarter networks for real-time communication in 6G. When AI is introduced into communication, real-time data transmission can be simplified and improved. AI can use countless analyses to determine methods to perform complex target tasks. That is, AI can increase efficiency and reduce processing delays. Time-consuming operations such as switching, network selection, and resource scheduling can be performed instantly by AI. AI can also play an important role in M2M, machine to human, and human to machine. In addition, AI may be instant communication in brain-computer interface (BCI). AI-based communication systems can be supported by metamaterials, smart structures, smart networks, smart devices, smart cognitive radios, self-maintaining wireless networks, and machine learning.

[0060] -THz (THz) communication: Data rates can be increased by increasing bandwidth. This can be achieved by using sub-TH communications with wide bandwidth and applying advanced massive MIMO technology. THz waves are called submillimeter radiation, generally indicating a frequency band between 0.1THz and 10THz with a corresponding wavelength in the range of 0.03mm to 3mm. The band range of 100GHz to 300GHz (sub-THz band) is considered to be the main part of the THz band for cellular communications. When the sub-THz band is added to the millimeter wave band, the 6G cellular communication capacity increases. 300GHz to 3THz of the defined THz band is in the far infrared (IR) band. The 300GHz to 3THz band is part of the optical band, but is located at the boundary of the optical band and immediately after the RF band. Therefore, the 300GHz to 3THz band has similarities with RF. Figure 2 The electromagnetic spectrum according to an embodiment of the present disclosure is shown. Figure 2 The embodiments of can be combined with various embodiments of the present disclosure. The main features of THz communication include (i) a wide bandwidth that can be used to support very high data rates; and (ii) high path loss occurs at high frequencies (highly directional antennas are essential). The narrow beamwidth generated in highly directional antennas reduces interference. The small wavelength of THz signals allows a larger number of antenna elements to be integrated with devices and BSs operating in this band. Therefore, advanced adaptive placement techniques that can overcome range limitations can be used.

[0061] - Massive MIMO technology (Large MIMO)

[0062] -Holographic Beamforming (HBF)

[0063] -Optical wireless technology

[0064] - Free Space Optical Backhaul Network (FSO Backhaul Network)

[0065] -Non-Terrestrial Network (NTN)

[0066] -Quantum communication

[0067] - No cellular communication

[0068] -Integration of wireless information and power transmission

[0069] -Integration of wireless communication and sensing

[0070] -Integrated access and backhaul network

[0071] -Big Data Analysis

[0072] -Reconfigurable smart surface

[0073] -Metaverse

[0074] -Blockchain

[0075] - Unmanned Aerial Vehicles (UAV): Unmanned aerial vehicles (UAV) or drones will be an important factor in 6G wireless communications. In most cases, UAV technology is used to provide high-speed data wireless connections. A base station entity is installed inside the UAV to provide cellular connectivity. UAVs have certain features not found in fixed base station infrastructure, such as easy deployment, strong line-of-sight links, and freedom of mobility control. During emergencies such as natural disasters, it is economically unfeasible to deploy terrestrial telecommunication infrastructure and sometimes it is impossible to provide services in turbulent environments. UAVs can easily handle such situations. UAVs will become a new paradigm in the field of wireless communications. This technology promotes the three basic requirements of wireless networks, such as eMBB, URLLC, and mMTC. UAVs can also be used for a variety of purposes, such as network connectivity improvement, fire detection, disaster emergency services, security and monitoring, pollution monitoring, parking monitoring, and accident monitoring. Therefore, UAV technology is recognized as one of the most important technologies for 6G communications.

[0076] -Autonomous driving (self-driving): In order to achieve perfect autonomous driving, it is necessary to inform each other of dangerous situations through communication between vehicles and vehicles, to check information such as parking information location and signal change time through communication between vehicles and infrastructure such as parking lots and / or traffic lights. Vehicle-to-Everything (V2X) is a core element for building an autonomous driving infrastructure, and is a technology for vehicles to communicate and share with various elements in the road, such as vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I). In order to maximize the performance of autonomous driving and ensure high safety, high transmission speed and low latency technology are required. In addition, in order to directly control vehicles in dangerous situations and actively intervene in vehicle driving at a level beyond warning or guidance messages to the driver, autonomous driving is expected to be maximized in 6G, which has faster transmission speeds and lower latency than 5G, because the amount of information to be sent and received is large.

[0077] For the sake of clarity of the specification, 5G NR is mainly described, but the technical ideas according to the embodiments of the present disclosure are not limited thereto. Various embodiments of the present disclosure can also be applied to 6G communication systems.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] Figure 4 A radio protocol architecture according to an embodiment of the present disclosure is shown. Figure 4 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Figure 4 (a) shows a radio protocol stack for the user plane of Uu communication, and Figure 4 (b) in FIG. 5 shows a radio protocol stack of a 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 a radio protocol stack of a control plane for SL communication.

[0083] 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 media access control (MAC) layer, which is the upper layer of the physical layer, through the transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how the data is transmitted through the radio interface and what characteristics of the data it transmits.

[0084] 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.

[0085] 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.

[0086] 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).

[0087] 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).

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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_INACTIVE) state is additionally defined, and the UE in the RRC_INACTIVE state can maintain the connection with the core network and release its connection with the BS.

[0092] Data is sent from the network to the UE via a downlink transport channel. Examples of downlink transport channels include a broadcast channel (BCH) for sending system information and a downlink shared channel (SCH) for sending other user traffic or control messages. Traffic or control messages for downlink multicast or broadcast services may be sent via a downlink SCH or may be sent via a separate downlink multicast channel (MCH). In addition, uplink transport 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 traffic or control messages.

[0093] 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.

[0094] 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.

[0095] Reference Figure 5In 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).

[0096] 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).

[0097] Table 2 shown below represents the number of symbols (N) per slot based on the SCS configuration (μ) 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 ).

[0098] [Table 2]

[0099]

[0100] 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.

[0101] 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.

[0102] 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).

[0103] [Table 3]

[0104] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 450MHz–6000MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0105] 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).

[0106] [Table 4]

[0107] Frequency range specification Corresponding frequency range Subcarrier Spacing (SCS) FR1 410MHz–7125MHz 15, 30, 60kHz FR2 24250MHz–52600MHz 60, 120, 240kHz

[0108] Figure 6 The structure of the time slot of the NR frame according to an embodiment of the present disclosure is shown. Figure 6 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0109] 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. For example, 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.

[0110] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple consecutive subcarriers in the frequency domain (e.g., 12 subcarriers). A bandwidth part (BWP) can be defined as multiple consecutive (physical) resource blocks ((P)RBs) in the frequency domain, and a BWP can correspond to a parameter set (e.g., SCS, CP length, etc.). A carrier can include up to N BWPs (e.g., 5 BWPs). Data communication can be performed via an activated BWP. Each element can be referred to as a resource element (RE) in a resource grid, and a complex symbol can be mapped to each element.

[0111] Hereinafter, the bandwidth part (BWP) and the carrier will be described in detail.

[0112] 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.

[0113] 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.For power saving, if the UE cannot detect downlink control information (DCI) during a specified period, the UE may switch the UE's active BWP to the default BWP.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] Hereinafter, V2X or SL communication will be described.

[0119] The side link synchronization signal (SLSS) may include a primary side link synchronization signal (PSSS) and a secondary side link synchronization signal (SSSS) as SL specific sequences. The PSSS may be referred to as a side link primary synchronization signal (S-PSS), and the SSSS may be referred to as a side link secondary synchronization signal (S-SSS). For example, an M sequence of length 127 may be used for the S-PSS, and a Gold sequence of length 127 may be used for the S-SSS. For example, the UE may use the S-PSS for initial signal detection and synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

[0120] 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).

[0121] S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., SL synchronization signal (SS) / PSBCH block, hereinafter, sidelink synchronization signal block (S-SSB)). The S-SSB can have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth can exist within the (pre-) configured sidelink (SL) BWP. For example, the S-SSB can have a bandwidth of 11 resource blocks (SBs). For example, the PSBCH can exist across 11 RBs. In addition, the frequency position of the S-SSB can be (pre-) configured. Therefore, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0122] Figure 8 A process of performing V2X or SL communication based on a transmission mode by a UE 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.

[0123] 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.

[0124] 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 operations related to NR resource allocation mode 2.

[0125] 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 S800, 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.

[0126] 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.

[0127] 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 DCI may be DCI format 3_0 or DCI format 3_1.

[0128] Hereinafter, an example of DCI format 3_0 will be described.

[0129] DCI format 3_0 is used for scheduling NR PSCCH and NR PSSCH in one cell.

[0130] The following information is sent via DCI format 3_0 with CRC scrambled by SL-RNTI or SL-CS-RNTI:

[0131] -Resource pool index-ceiling(log 2 I) bits, where I is the number of resource pools used for transmission configured by the higher layer parameter sl-TxPoolScheduling.

[0132] - Time gap - 3 bits determined by the higher layer parameter sl-DCI-ToSL-Trans

[0133] -HARQ process number - 4 bits

[0134] - New data indicator - 1 bit

[0135] - the lowest index of the subchannel allocated to the initial transmission -ceiling(log 2 (N SL subChannel ))Bit

[0136] -SCI format 1-A field: frequency resource assignment, time resource assignment

[0137] -PSFCH-to-HARQ feedback timing indicator -ceiling(log 2 N fb_timing ) bits, where N fb_timing is the number of entries in the higher layer parameter sl-PSFCH-ToPUCCH.

[0138] -PUCCH resource indicator - 3 bits

[0139] - 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.

[0140] - Counter sidelink 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

[0141] - Filling bits if necessary

[0142] Reference Figure 8 (b) in LTE transmission mode 2, LTE transmission mode 4 or NR resource allocation mode 2, the UE can determine the SL transmission resources within the SL resources configured by the base station / network or the preconfigured SL resources. For example, the configured SL resources or the preconfigured SL resources can be a resource pool. For example, the UE can autonomously select or schedule resources for SL transmission. For example, the UE can perform SL communication by autonomously selecting resources within the configured resource pool. For example, the UE can autonomously select resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing can be performed in units of subchannels. For example, in step S810, the first UE that has selected resources from the resource pool by itself can send a PSCCH (e.g., sidelink control information (SCI) or a first-level SCI) to a second UE by using the resources. In step S820, the first UE can 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 can receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0143] 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.

[0144] Hereinafter, an example of SCI format 1-A will be described.

[0145] SCI format 1-A is used for scheduling PSSCH and secondary SCI on PSSCH.

[0146] The following information is sent via SCI Format 1-A:

[0147] - Priority - 3 bits

[0148] - Frequency resource assignment - When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, the ceiling (log 2 (N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured as 3, the ceiling log 2 (N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits.

[0149] - Time Resource Assignment - 5 bits when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 2; otherwise, 9 bits when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 3

[0150] -Resource reservation period - If the higher layer parameter sl-MultiReserveResource is configured, the ceiling(log 2N rsv_period ) bits, where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise, 0 bit -DMRS pattern -ceiling (log 2 N pattern ) bits, where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0151] - Second level SCI format - 2 bits, as defined in Table 5

[0152] - Beta_offset indicator - 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0153] - Number of DMRS ports - 1 bit, as defined in Table 6

[0154] - Modulation and coding scheme - 5 bits

[0155] - Additional MCS table indicator - 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise, 0 bit

[0156] -PSFCH overhead indication - 1 bit if higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bit

[0157] - Reserved bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0158] [Table 5]

[0159] 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

[0160] [Table 6]

[0161] The value of the Number of DMRS Ports field Antenna Port 0 1000 1 1000 and 1001

[0162] Hereinafter, an example of SCI format 2-A will be described.

[0163] SCI format 2-A is used for decoding of PSSCH and is used together with the HARQ operation when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0164] The following information is sent via SCI Format 2-A:

[0165] -HARQ process number - 4 bits

[0166] - New data indicator - 1 bit

[0167] - Redundancy version - 2 bits

[0168] - Source ID - 8 bits

[0169] -Destination ID - 16 bits

[0170] -HARQ feedback enable / disable indicator - 1 bit

[0171] - Broadcast Type Indicator - 2 bits, as defined in Table 7

[0172] -CSI request - 1 bit

[0173] [Table 7]

[0174] The value of the broadcast type indicator Broadcast Type 00 broadcast 01 Multicast when HARQ-ACK information includes ACK or NACK 10 Unicast 11 Multicast when HARQ-ACK information includes only NACK

[0175] Hereinafter, an example of SCI format 2-B will be described.

[0176] For HARQ operation, when HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information, SCI format 2-B is used for decoding of PSSCH.

[0177] The following information is sent via SCI Format 2-B:

[0178] -HARQ process number - 4 bits

[0179] - New data indicator - 1 bit

[0180] - Redundancy version - 2 bits

[0181] - Source ID - 8 bits

[0182] -Destination ID - 16 bits

[0183] -HARQ feedback enable / disable indicator - 1 bit

[0184] - Region ID - 12 digits

[0185] -Communication range requirement - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0186] 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 resources, and the second UE may send the HARQ feedback to the first UE using the PSFCH resources.

[0187] Reference Figure 8 (a), in step S840, the first UE may send SL HARQ feedback to the base station via PUCCH and / or PUSCH.

[0188] Fig. 9 Three types of broadcasts are shown in accordance with embodiments of the present disclosure. Fig. 9 The embodiments of can be combined with various embodiments of the present disclosure. Specifically, Fig. 9 (a) shows broadcast type SL communication, Fig. 9 (b) in FIG. 4 shows unicast type SL communication, and Fig. 9 (c) shows multicast SL communication. In the case of unicast SL communication, the UE can perform one-to-one communication with another UE. In the case of multicast SL transmission, the UE can perform SL communication with one or more UEs in the group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced by SL multicast communication, SL one-to-many communication, etc.

[0189] Hereinafter, a hybrid automatic repeat request (HARQ) process will be described.

[0190] 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 whose target is 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 whose target is 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.

[0191] 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.

[0192] (1) Multicast Option 1: After the receiving UE decodes the PSCCH whose target is the receiving UE, if the receiving UE cannot decode the transport block associated with the PSCCH, the receiving UE may send HARQ-NACK to the sending UE through the PSFCH. Otherwise, if the receiving UE decodes the PSCCH whose target is the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may not send HARQ-ACK to the sending UE.

[0193] (2) Multicast Option 2: After the receiving UE decodes the PSCCH whose destination is the receiving UE, if the receiving UE cannot decode the transport block associated with the PSCCH, the receiving UE may send HARQ-NACK to the transmitting UE via the PSFCH. In addition, if the receiving UE decodes the PSCCH whose destination is the receiving UE and if the receiving UE successfully decodes the transport block associated with the PSCCH, the receiving UE may send HARQ-ACK to the transmitting UE via the PSFCH.

[0194] For example, if multicast option 1 is used for 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 resources.

[0195] For example, if multicast option 2 is used for 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.

[0196] 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.

[0197] Meanwhile, according to an embodiment of the present disclosure, a communication method between a UE and a base station may be supported in an unlicensed band in NR-Unlicensed.

[0198] For example, it may be planned to support mechanisms for supportable communications between sidelink UEs in Release 18.

[0199] According to an embodiment of the present disclosure for NR-U, for example, the types of channel / channel occupancy / channel occupancy time / LBT (CAP, channel access procedure) may be as follows.

[0200] - Channel: A set of frequency domain resources on which LBT is performed, for example, this may refer to a 20 MHz LBT bandwidth in NR-U, for example, this may have the same meaning as an RB set.

[0201] - Channel Occupancy (CO): may refer to the time domain / frequency domain resources obtained by the base station or UE after LBT is successful.

[0202] - Channel Occupancy Time (COT): may refer to the time domain resources obtained by the base station or UE after LBT is successful. The COT may be shared between the base station (or UE) and the UE (or base station) that has obtained the CO, which may be referred to as COT sharing. Depending on the initiating device, it may also be referred to as gNB-initiated COT or UE-initiated COT.

[0203] - LBT type (or channel access procedure) used for DL / UL transmission.

[0204] - Type 1 (eg, also known as Cat-4 LBT): a channel access procedure based on random backoff.

[0205] -Cat-4: It can be a contention window change.

[0206] - Type 2: Can be performed in case of COT sharing within the COT acquired by the gNB or UE

[0207] - Type 2A (also known as Cat-2 LBT (single-pin LBT) or one-shot LBT, for example): 25 microsecond one-shot LBT

[0208] -TX starts immediately after a gap of at least 25 microseconds in idle sensing

[0209] -Can be used to initiate SSB and non-unicast DL information transmission

[0210] - Type 2B (16 microseconds one-shot LBT)

[0211] -TX starts immediately after a 16us gap in idle sensing

[0212] - Type 2C (also known as Cat-1 LBT (does not perform LBT) or no LBT, for example)

[0213] -TX starts immediately after up to 16us gap and does not sense the channel before transmitting

[0214] - The transmission duration is at most 584us

[0215] At the same time, according to the embodiments of the present disclosure, a communication method between a UE and a base station can be supported in an unlicensed band in NR-Unlicensed. For example, a mechanism that supports supportable communication between sidelink UEs can be planned in Release 18.

[0216] In the present disclosure, a channel may refer to a set of frequency domain resources in which listen-before-talk (LBT) is performed. In NR-U, a channel may refer to a LBT bandwidth of 20 MHz and may have the same meaning as an RB set. For example, an RB set may be defined in Section 7 of 3GPP TS 38.214 V17.0.0.

[0217] 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.

[0218] In the present disclosure, channel occupation time (COT) may refer to the time domain resources obtained by the base station or UE after LBT is successful. It can be shared between the base station (or UE) that obtains CO and the 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.

[0219] Hereinafter, a wireless communication system supporting an unlicensed band / shared spectrum will be described.

[0220] Fig.10 An example of a wireless communication system supporting an unlicensed frequency band based on an embodiment of the present disclosure is shown. For example, Fig.10 Unlicensed spectrum (NR-U) wireless communication systems may be included. Fig.10 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0221] In the following description, a cell operating in a licensed band (hereinafter referred to as 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 referred to as 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.

[0222] When the base station and the UE send and receive signals on the LCC and UCC of the carrier aggregation, such as Fig.10 As shown in (a) of FIG. 1 , the LCC and the UCC can be configured as a primary CC (PCC) and a secondary CC (SCC), respectively. The base station and the UE can send and receive signals on one UCC or multiple carrier aggregated UCCs, such as Fig.10As shown in (b) of . In other words, the base station and the UE can send and receive signals only on the UCC without using any LCC. For independent operation, PRACH transmission, PUCCH transmission, PUSCH transmission, SRS transmission, etc. can be supported on the UCell.

[0223] exist Fig.10 In the implementation manner, the base station can be replaced by a UE. In this case, for example, PSCCH transmission, PSSCH transmission, PSFCH transmission, S-SSB transmission, etc. can be supported on the UCell.

[0224] Unless otherwise stated, the following definitions may apply to the following terms used in this disclosure.

[0225] - Channel: A carrier or a part of a carrier consisting of a set of consecutive RBs, where a channel access procedure is performed in a shared spectrum.

[0226] - 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. A basic sensing unit is a unit with a duration of T sl = 9us sensing time slot. The base station or UE senses the channel during the sensing time slot duration. If the power detected within at least 4us of 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).

[0227] - Channel occupancy: Transmission of the base station / UE on the channel after the channel access procedure.

[0228] - Channel Occupancy Time (COT): The total time that a base station / UE and any base station / UE sharing the channel occupancy 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 into the COT. The COT can be shared by the base station and the corresponding UE for transmission.

[0229] -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. Without sensing channel availability within a DL transmission burst, the base station may perform a transmission after a gap.

[0230] -UL or SL transmission burst: A collection 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. Without sensing channel availability within a UL or SL transmission burst, the UE may perform a transmission after a gap.

[0231] -Discovery Burst: A DL transmission burst that 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 base station-initiated transmission that includes PSS, SSS, and cell-specific RS (CRS), and further includes a 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 further includes a CORESET of a PDCCH for scheduling a PDSCH carrying SIB1, a PDSCH carrying SIB1, and / or a non-zero power CSI-RS.

[0232] Fig.11 A method for occupying resources in an unlicensed frequency band according to an embodiment of the present disclosure is shown. Fig.11 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0233] Reference Fig.11 , a communication node (e.g., base station, UE) in an unlicensed band should determine whether other communication nodes are using the channel before signal transmission. To this end, a communication node in an unlicensed band may perform a channel access procedure (CAP) to access the channel on which 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, it is said that an idle channel assessment (CCA) is confirmed. If a CCA threshold (e.g., X) is predefined or configured by a higher layer (e.g., RRC), the CCA threshold may be set to the value of the CCA threshold. Thresh ), if the detected channel energy is above the CCA threshold, the communication node may determine that the channel is busy. Otherwise, the communication node may determine that the channel is idle. If the channel is determined to be idle, the communication node may initiate signal transmission in the unlicensed band. CAP may be replaced by LBT.

[0234] Table 8 shows an example of a channel access procedure (CAP) supported in NR-U.

[0235] [Table 8]

[0236]

[0237] Referring to Table 8, LBT types or CAPs for DL / UL / SL transmission may be defined. However, Table 8 is only an example, and new types or CAPs may be defined in a similar manner. For example, Type 1 (also known as Cat-4 LBT) may be a channel access procedure based on random backoff. For example, in the case of Cat-4, the contention window may change. For example, in the case of COT sharing within a COT acquired by a base station (gNB) or UE, Type 2 may be performed.

[0238] Hereinafter, an LBT-subband (SB) (or RB set) will be described.

[0239] 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 with a larger bandwidth (BW) than legacy LTE. However, according to regulations, the BW of a CCA that requires independent LBT operation may be restricted. A subband (SB) for performing LBT alone is defined as an LBT-SB. Then, multiple LBT-SBs may be included in one broadband cell / BWP. The set of RBs included in the LBT-SB may be configured through higher layer (e.g., RRC) signaling. Therefore, based on (i) the BW of the cell / BWP and (ii) the RB set allocation information, one or more LBT-SBs may be included in one cell / BWP.

[0240] Fig.12 A case where a plurality of LBT-SBs are included in a license-free band according to an embodiment of the present disclosure is shown. Fig.12 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0241] Reference Fig.12 , a plurality of LBT-SBs may be included in the BWP of a cell (or carrier). The LBT-SB may have, for example, a 20 MHz frequency band. The LBT-SB may include a plurality of 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.

[0242] Hereinafter, a channel access priority class (CAPC) will be described.

[0243] The CAPC of the MAC CE and radio bearers can be fixed or configured to operate in FR1:

[0244] - Fixed to the lowest priority for filling the Buffer Status Report (BSR) and the bit rate suggested MAC CE;

[0245] -For SRB0, SRB1, SRB3 and other MAC CEs, it is fixed as the highest priority;

[0246] -Configured by the base station for SRB2 and DRB.

[0247] When selecting the CAPC for a DRB, the base station considers fairness between other service types and transmissions while considering the 5QI of all QoS flows multiplexed to the corresponding DRB. Table 9 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC 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.

[0248] [Table 9]

[0249]

[0250] 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.

[0251] The base station may perform one of the following channel access procedures (eg, CAP) for downlink signal transmission in the unlicensed band.

[0252] (1) Type 1 Downlink (DL) CAP method

[0253] In a Type 1 DL CAP, the length of the duration spanned by a sensing slot sensed as idle prior to a transmission may be random. Type 1 DL CAP may be applied to the following transmissions:

[0254] - a transmission initiated by a base station, comprising (i) a unicast PDSCH with user plane data or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0255] - A transmission initiated by a base station, comprising (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0256] Fig.13 A CAP operation of transmitting a downlink signal through an unlicensed frequency band by a base station according to an embodiment of the present disclosure is shown. Fig.13 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0257] Reference Fig.13 , the base station can sense whether the channel is idle to sense the 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 a channel for additional sensing of the time slot duration according to the following steps:

[0258] Step 1) (S120) The base station sets N to N init (N=N init ), where N init is evenly distributed between 0 and CW p Then, step 4 continues.

[0259] 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).

[0260] Step 3) (S150) The base station senses the channel for the additional sensing time slot duration. If the additional sensing time slot duration is idle (Y), step 4 is continued. Otherwise (N), step 5 is continued.

[0261] Step 4) (S130) If N=0 (Y), the base station terminates CAP (S132). Otherwise (N), step 2 continues.

[0262] Step 5) (S160) The base station senses the channel until the additional delay duration T d The busy sensing time slot or the additional delay duration T d All time slots are detected as idle.

[0263] Step 6) (S170) If the additional delay duration T d If the channel is sensed to be idle during all time slots of the channel (Y), then step 4 is continued. Otherwise (N), step 5 is continued.

[0264] Table 10 shows the m applied to CAP p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT) and allowed CW size vary depending on the channel access priority class.

[0265] [Table 10]

[0266]

[0267] Referring to Table 10, the contention window size (CWS), maximum COT value, etc. for each CAPC may be defined. d Can be equal to Tf +m p *T sl (T d =T f +m p *T sl ).

[0268] Delay duration T d Configured in the following order: Duration T f (16us)+m p The duration of the continuous sensing time slot is T sl (9us).T f The sensing time slot duration T includes the beginning of the 16us duration sl .

[0269] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Available via CW p =CW min,p is configured and updated (CW size update) based on HARQ-ACK feedback (e.g., ratio of ACK or NACK) for the previous DL burst (e.g., PDSCH) before step 1. p Can be initialized to CW based on HARQ-ACK feedback for previous DL burst min,p . Alternatively, CW p Can be increased to the next higher allowed value or left as is.

[0270] (2) Type 2 Downlink (DL) CAP Method

[0271] In a Type 2 DL CAP, the length of the duration spanned by a sensing slot sensed to be idle before transmission may be determined. The Type 2 DL CAP is classified into Type 2A / 2B / 2C DL CAPs.

[0272] Type 2A DL CAP may be applied to the following transmissions. In Type 2A DL CAP, the base station may transmit the following transmissions at least during the sensing duration T short_dl = Transmission is performed immediately after sensing that the channel is idle within 25us. Here, T short_dl Including duration T f (=16us) and then the duration T f The duration of a sensing time slot is T f A sensing time slot is included at its beginning.

[0273] - A transmission initiated by a base station includes (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information, or

[0274] - Transmission by the base station within the shared channel occupation after a transmission interval of 25us with the UE.

[0275] Type 2B DL ​​CAP is applicable to transmissions performed by the base station during the shared channel occupancy time and after a 16us interval between transmissions by the UE. In Type 2B DL ​​CAP, the base station can f = Transmission is performed immediately after sensing that the channel is idle within 16us. f Includes a sensing slot within 9us starting from the end of the duration. Type 2C DL CAP is applicable to transmissions performed by the base station within the shared channel occupancy time and up to 16us after transmission by the UE. In Type 2C DL CAP, the base station does not perform channel sensing before performing transmission.

[0276] A method of transmitting an uplink signal through an unlicensed frequency band will be described below. 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.

[0277] The UE may perform a Type 1 or 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) configured by the base station for UL signal transmission. For example, a UL grant (e.g., DCI formats 0_0 and 0_1) for scheduling PUSCH transmission may include CAP type indication information for the UE.

[0278] (1) Type 1 Uplink (UL) CAP method

[0279] In Type 1 UL CAP, 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.

[0280] -PUSCH / SRS transmission scheduled and / or configured by the base station

[0281] - PUCCH transmissions scheduled and / or configured by the base station

[0282] - Transmissions related to the Random Access Procedure (RAP)

[0283] Fig.14 A Type 1 CAP operation performed by a UE according to an embodiment of the present disclosure to transmit an uplink signal is shown. Fig.14 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0284] Reference Fig.14 , the UE can sense whether the channel is idle to sense the 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:

[0285] Step 1) (S220) UE sets N to N init (N=N init ), where N init is evenly distributed between 0 and CW p Then, step 4 continues.

[0286] Step 2) (S240) If N>0 and the UE determines to decrease the counter, the UE sets N to N-1 (N=N-1).

[0287] Step 3) (S250) The UE senses the channel during the additional sensing time slot duration. If the additional sensing time slot duration is idle (yes), step 4 is continued. Otherwise (no), step 5 is continued.

[0288] Step 4) (S230) If N=0 (Yes), the UE terminates the CAP (S232). Otherwise (No), continue to execute step 2.

[0289] Step 5) (S260) The UE senses the channel until the additional delay duration T d A busy sensing time slot or an additional delay duration T is detected. d All time slots of are detected as being idle.

[0290] Step 6) (S270) If the additional delay duration T d If the channel is sensed to be idle during all time slot durations (yes), then step 4 is continued. Otherwise (no), step 5 is continued.

[0291] Table 11 shows the m applied to CAP p , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW size vary depending on the channel access priority category.

[0292] [Table 11]

[0293]

[0294]

[0295] Referring to Table 11, the contention window size (CWS), maximum COT value, etc. for each CAPC may be defined. d Can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0296] Delay duration T d Configure in the following order: Duration T f (16us)+m p The duration of the continuous sensing time slot is T sl (9us).T f The sensing time slot duration T includes the beginning of the 16us duration sl .

[0297] Satisfies the following relationship: CW min,p <=CW p <=CW max,p .CW p Can be by CW p =CW min,p Configuration, and before step 1, update (CW size update) based on explicit / implicit reception response to previous UL burst (e.g., PUSCH). For example, CW size can be updated based on explicit / implicit reception response to previous UL burst. p Initialize to CW min,p . Alternatively, CW p Can be increased to the next higher allowed value or left as is.

[0298] (2) Type 2 Uplink (UL) CAP method

[0299] In a Type 2 UL CAP, the length of the duration spanned by the sensing time slots that are sensed to be idle before transmission can be determined. Type 2 UL CAP is classified into Type 2A / 2B / 2C UL CAP. In a Type 2A UL CAP, the UE can determine the length of the duration spanned by the sensing time slots that are sensed to be idle before transmission. short_dl = Transmission is performed immediately after sensing that the channel is idle within 25us. Here, T short_dl Including duration T f (=16us) and then for a duration of T f The duration of a sensing slot after that. In Type 2A UL CAP, T f In a Type 2B UL CAP, the UE may include a sensing time slot at its beginning. f= Transmission is performed immediately after sensing that the channel is idle within 16us. In Type 2B UL CAP, T f The sensing slot within 9us starting from the end of the duration is included. In Type 2C UL CAP, the UE does not perform channel sensing before performing transmission.

[0300] 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 of the data by applying parameters of the corresponding CACP (e.g., minimum contention window size, maximum contention window size, m p , etc.) to perform NR-U operation. For example, the UE may select a backoff counter (BC) after selecting a random value between the minimum CW and the maximum CW mapped to the CAPC. In this case, for example, BC may be a positive integer less than or equal to the random value. If the channel is idle, the UE sensing the channel decreases BC by 1. If BC becomes zero and the UE is at time T d (T d =T f +m p *T sl ) detects that the channel is idle, the UE can try to send data by occupying the channel. sl (=9 microseconds) is a basic sensing unit or sensing time slot and may include a measurement duration of at least 4 microseconds. f The first 9 microseconds of (=16 microseconds) can be configured as T sl .

[0301] 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.

[0302] For example, Type 2A (also known as Cat-2 LBT (one-time LBT) or one-time LBT) can be a 25 microsecond one-time LBT. In this case, the transmission can start immediately after idle sensing within a gap of at least 25 microseconds. Type 2A can be used to initiate transmission of SSB and non-unicast DL information. That is, the UE can sense the channel within 25 microseconds within the COT, and if the channel is idle, the UE can attempt to send data by occupying the channel.

[0303] For example, type 2B may be a 16 microsecond one-time LBT. In this case, the transmission may start immediately after idle sensing within a 16 microsecond gap. That is, the UE may sense the channel within 16 microseconds within the COT, and if the channel is idle, the UE may attempt to send data by occupying the channel.

[0304] 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 after 16 microseconds without sensing, and the UE may perform the transmission within up to 584 microseconds.

[0305] Fig.15 The channel access process based on the embodiment of the present disclosure is shown. Specifically, Fig.15 (a) shows an example of a dynamic channel access process (payload-based equipment, LBE), and Fig.15 (b) shows an example of a semi-static channel access procedure (frame-based equipment, FBE). Fig.15 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0306] Reference Fig.15 (a), if the channel is idle, the UE can perform contention 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.

[0307] Reference Fig.15 (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 time (or start time) before the start 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.

[0308] According to an embodiment of the present disclosure, for example, when a (consistent) LBT failure occurs in the sidelink unlicensed band (e.g., a one-time LBT failure or a maximum threshold number of LBT failures (e.g., lbt-FailureInstanceMaxCount)), the communication quality between UEs in the unlicensed band may deteriorate, so that the communication between UEs may not be performed smoothly. In addition, for example, when the number of LBT failures occurring reaches sl-lbt-FailureInstanceMaxCount, the UE may send a scheduling request (SR) to the base station to be allocated an authorization (resource) for sending an LBT failure MAC CE (e.g., an LBT failure MAC CE reported to a serving cell (base station, network) by a UE that detects a threshold number of SL LBT failures). For example, the UE may send a scheduling request to the base station to be allocated resources for sending sidelink data (e.g., sidelink data or sidelink MAC CE) or uplink data (e.g., uplink data or uplink MAC CE). For example, the UE may have multiple pending (triggered) scheduling requests to send to the base station. For example, the UE may have a pending (triggered) SR for LBT failed MAC CE transmission, a pending (triggered) SR for sidelink data or sidelink MAC CE transmission, and a triggered SR (or pending SR) for uplink data or uplink MAC CE transmission. Therefore, in one embodiment of the present disclosure, for example, when the UE has multiple (pending) triggered SRs (including an SR for transmitting LBT failed MAC CE), a priority rule for transmitting triggered (pending) SRs may be proposed.

[0309] For example, if the UE has a pending (triggered) SR for LBT failed MAC CE transmission, a pending (triggered) scheduling request (SR) for sidelink data or sidelink MAC CE transmission, and / or a triggered scheduling request (SR) (or pending SR) for uplink data or uplink MAC CE transmission, the triggered SR (or pending SR) in the logical channel of the higher priority order may be sent first. For example, a scheduling request for a MAC CE corresponding to the priority of a logical channel with a smaller priority order value (e.g., a smaller value means a higher priority order) may be sent first. For example, the UE may compare the priority of the logical channel of the LBT failed MAC CE with the priority of the logical channel of the data or other MAC CE, and first send a triggered (pending) SR for transmitting higher priority data or MAC CE.

[0310] According to an embodiment of the present disclosure, for example, if the UE has an SR for sending an uplink MAC CE (e.g., an LBT failure MAC CE) and a triggered SR for sending uplink data or an uplink MAC CE (e.g., or a pending SR), the SR for the data or MAC CE related to the LCH (logical channel) mapped to at least one of the following priority orders may be sent first. By comparing the priority of (at least one of the following items) of the logical channel of the LBT failure MAC CE with the priority of (at least one of the following items) of the logical channel of the data or other MAC CE, the triggered SR for transmitting the data or MAC CE with a higher priority may be sent first.

[0311] For example, logical channels should be prioritized according to at least one of the following orders (highest priority listed first):

[0312] -C-RNTI MAC CE or data from UL-CCCH; (highest priority)

[0313] -Configure authorization confirmation MAC CE or MAC CE for BFR or multiple entries configure authorization confirmation MAC CE;

[0314] -Sidelink configuration authorization confirmation MAC CE;

[0315] - LBT Failure MAC CE (e.g., a MAC CE used to report a consistent Uu LBT failure to the base station);

[0316] -MAC CE for timing advance reporting;

[0317] - MAC CE for prioritized SL-BSR;

[0318] - MAC CE for reporting sidelink LBT failure (e.g., MAC CE intended to report consistent Uu LBT failure to the base station);

[0319] - MAC CE for BSR, except for BSR included for padding;

[0320] - Single-entry PHR MAC CE or multiple-entry PHR MAC CE;

[0321] - MAC CE for the desired number of guard symbols;

[0322] -MAC CE for preemptive BSR;

[0323] - MAC CE for SL-BSRs, except for prioritized SL-BSRs and SL-BSRs included for padding;

[0324] - data from any logical channel, except data from UL-CCCH;

[0325] -MAC CE for recommended bit rate query;

[0326] - MAC CE for BSR included for padding;

[0327] -MAC CE for SL-BSR included for padding. (lowest priority)

[0328] Or, for example, logical channels should be prioritized according to at least one of the following orders (highest priority listed first):

[0329] -C-RNTI MAC CE or data from UL-CCCH; (highest priority)

[0330] -Configure authorization confirmation MAC CE or MAC CE for BFR or multiple entries configure authorization confirmation MAC CE;

[0331] -Sidelink configuration authorization confirmation MAC CE;

[0332] -LBT failure MAC CE (the purpose is to report consistent Uu LBT failure MAC CE to the base station);

[0333] - A MAC CE for reporting a sidelink LBT failure (e.g., a MAC CE intended to report a consistent sidelink LBT failure to a base station);

[0334] -MAC CE for timing advance reporting;

[0335] - MAC CE for prioritized SL-BSR;

[0336] - MAC CE for BSR, except for BSR included for padding;

[0337] - Single-entry PHR MAC CE or multiple-entry PHR MAC CE;

[0338] - MAC CE for the desired number of guard symbols;

[0339] -MAC CE for preemptive BSR;

[0340] - MAC CE for SL-BSRs, except for prioritized SL-BSRs and SL-BSRs included for padding;

[0341] - data from any logical channel, except data from UL-CCCH;

[0342] -MAC CE for recommended bit rate query;

[0343] - MAC CE for BSR included for padding;

[0344] -MAC CE for SL-BSR included for padding. (lowest priority)

[0345] According to an embodiment of the present disclosure, for example, when the UE simultaneously has an SR for sending an uplink MAC CE (e.g., LBT failure MAC CE: MAC CE intended to report a Uu consistent LBT failure) and a triggered SR (or pending SR) for sending sidelink data or (sidelink) MAC CE (e.g., MAC CE for reporting a (consistent) sidelink LBT failure), a prioritization rule having operations as at least one of the following may be proposed. For example, the UE may determine that the priority value of the logical channel (LCH) related to the SR (e.g., the logical channel (LCH) priority value of the sidelink LBT failure MAC CE, the logical channel (LCH) priority value of the uplink data or the uplink MAC CE) and the priority (priority sorting) threshold (e.g., ul-PrioritizationThres: may represent the UL priority (priority sorting) threshold used to determine whether SL TX takes precedence over UL TX. The network may not configure sl-PrioritizationThres and ul-PrioritizationThres separately for the UE. And, sl-PrioritizationThres: may represent the SL priority (priority sorting) threshold used to determine whether (multiple) SL TXs take precedence over (multiple) UL TXs. For example, the network may not configure sl-PrioritizationThres and ul-PrioritizationThres separately for the UE) may be compared to determine which of the SR for LBT failure MAC CE transmission and the triggered SR for sidelink data or (sidelink) MAC CE transmission will be sent first.

[0346] For example, the UE may compare the logical channel (LCH) priority value of the LBT failure MAC CE with the ul-PrioritizationThres, and if the logical channel (LCH) priority value of the LBT failure MAC CE is less than the ul-PrioritizationThres, the SR for the LBT failure MAC CE transmission may be prioritized, and the triggered SR for the LBT failure MAC CE transmission may be sent first.

[0347] For example, the UE may compare the logical channel (LCH) priority value of the LBT failure MAC CE with the ul-PrioritizationThres, and / or may compare whether the logical channel (LCH) priority value of the LBT failure MAC CE is greater than the ul-PrioritizationThres, and / or the UE may compare the logical channel (LCH) priority value of the sidelink data or (sidelink) MAC CE associated with the triggered SR with the sl-PrioritizationThres, and / or may compare whether the logical channel (LCH) priority value of the sidelink data or (sidelink) MAC CE is less than or greater than the sl-PrioritizationThres. For example, if the logical channel (LCH) priority value of the sidelink data or (sidelink) MAC CE is less than the sl-PrioritizationThres, the SR for the transmission of the sidelink data or (sidelink) MAC CE may take precedence over the triggered SR for the transmission of the LBT failure MAC CE (uplink MAC CE), and the SR for the transmission of the sidelink data or (sidelink) MAC CE may be sent first. For example, if the logical channel (LCH) priority value of the sidelink data or (sidelink) MAC CE is greater than sl-PrioritizationThres, the SR for sending LBT failure MAC CE (uplink MAC CE) can take precedence over the triggered SR for sending the sidelink data or (sidelink) MAC CE, so that the triggered SR for sending LBT failure MAC CE (uplink MAC CE) can be sent first.

[0348] According to an embodiment of the present disclosure, for example, when the UE simultaneously has an SR for sending an uplink MAC CE (e.g., LBT failure MAC CE: MAC CE intended to report Uu-consistent LBT failure) and a triggered SR (or pending SR) for sending a (side link) MAC CE (e.g., MAC CE for reporting side link LBT failure), a priority rule having at least one of the following operations may be proposed.

[0349] For example, according to at least one of the following logical channel (LCH) priority orders, the transmission of a higher priority MAC CE may be prioritized so that the corresponding uplink MAC CE may be sent.

[0350] For example, logical channels may be prioritized according to at least one of the following orders (highest priority listed first):

[0351] -C-RNTI MAC CE or data from UL-CCCH; (highest priority)

[0352] -Configure authorization confirmation MAC CE or MAC CE for BFR or multiple entries configure authorization confirmation MAC CE;

[0353] -Sidelink configuration authorization confirmation MAC CE;

[0354] - LBT failure MAC CE for reporting Uu LBT failure (the purpose is to report a consistent Uu LBT failure MAC CE to the base station);

[0355] - A MAC CE for reporting a sidelink LBT failure (e.g., a MAC CE intended to report a consistent sidelink LBT failure to a base station);

[0356] -MAC CE for timing advance reporting;

[0357] - MAC CE for prioritized SL-BSR;

[0358] - MAC CE for BSR, except for BSR included for padding;

[0359] - Single-entry PHR MAC CE or multiple-entry PHR MAC CE;

[0360] - MAC CE for the desired number of guard symbols;

[0361] -MAC CE for preemptive BSR;

[0362] - MAC CE for SL-BSRs, except for prioritized SL-BSRs and SL-BSRs included for padding;

[0363] - data from any logical channel, except data from UL-CCCH;

[0364] -MAC CE for recommended bit rate query;

[0365] - MAC CE for BSR included for padding;

[0366] -MAC CE for SL-BSR included for padding. (lowest priority)

[0367] Or, for example, logical channels should be prioritized according to at least one of the following orders (highest priority listed first):

[0368] -C-RNTI MAC CE or data from UL-CCCH; (highest priority)

[0369] -Configure authorization confirmation MAC CE or MAC CE for BFR or multiple entries of authorization confirmation MAC CE;

[0370] -Sidelink configuration authorization confirmation MAC CE;

[0371] - LBT Failure MAC CE for reporting Uu consistent LBT failure == MAC CE for reporting sidelink consistent LBT failure (purpose is to report consistent sidelink LBT failure MAC CE to the base station). (same priority)

[0372] -MAC CE for timing advance reporting;

[0373] - MAC CE for prioritized SL-BSR;

[0374] - MAC CE for BSR, except for BSR included for padding;

[0375] - Single-entry PHR MAC CE or multiple-entry PHR MAC CE;

[0376] - MAC CE for the desired number of guard symbols;

[0377] -MAC CE for preemptive BSR;

[0378] - MAC CE for SL-BSRs, except for prioritized SL-BSRs and SL-BSRs included for padding;

[0379] - data from any logical channel, except data from UL-CCCH;

[0380] -MAC CE for recommended bit rate query;

[0381] - MAC CE for BSR included for padding;

[0382] -MAC CE for SL-BSR included for padding. (lowest priority)

[0383] Or, for example, logical channels should be prioritized according to at least one of the following orders (highest priority listed first):

[0384] -C-RNTI MAC CE or data from UL-CCCH; (highest priority)

[0385] -Configure authorization confirmation MAC CE or MAC CE for BFR or multiple entries configure authorization confirmation MAC CE;

[0386] -Sidelink configuration authorization confirmation MAC CE;

[0387] - LBT failure MAC CE for reporting Uu LBT failure (the purpose is to report a consistent Uu LBT failure MAC CE to the base station);

[0388] - A MAC CE for reporting a sidelink LBT failure (e.g., a MAC CE intended to report a consistent sidelink LBT failure to a base station);

[0389] -MAC CE for timing advance reporting;

[0390] - MAC CE for prioritized SL-BSR;

[0391] - MAC CE for BSR, except for BSR included for padding;

[0392] - Single-entry PHR MAC CE or multiple-entry PHR MAC CE;

[0393] - MAC CE for the desired number of guard symbols;

[0394] -MAC CE for preemptive BSR;

[0395] - MAC CE for SL-BSRs, except for prioritized SL-BSRs and SL-BSRs included for padding;

[0396] - data from any logical channel, except data from UL-CCCH;

[0397] -MAC CE for recommended bit rate query;

[0398] - MAC CE for BSR included for padding;

[0399] -MAC CE for SL-BSR included for padding. (lowest priority)

[0400] According to an embodiment of the present disclosure, for example, when the UE (simultaneously) has an SR for sending an uplink MAC CE (e.g., LBT failure MAC CE: MAC CE for reporting Uu-consistent LBT failure) and a triggered SR (or pending SR) for sending a (sidelink) MAC CE (e.g., MAC CE for reporting sidelink LBT failure (to the base station)), a priority rule with at least one of the following operations may be proposed.

[0401] For example, if uplink MAC CE and (sidelink) MAC CE retransmission HARQ is allowed, the MAC CE for retransmission can be prioritized so that it (MAC CE for retransmission) is sent first. For example, if both uplink MAC CE and (sidelink) MAC CE are used for retransmission, the priority can be determined according to the above-mentioned priority order of uplink MAC CE, and the transmission with higher priority can be sent first. For example, if the uplink MAC CE for reporting a Uu-consistent LBT failure is an initial transmission, and / or if the uplink MAC CE for reporting a sidelink-consistent LBT failure is a retransmission after an initial transmission failure, and / or a transmission conflict occurs between two uplink MAC CEs when attempting to perform a retransmission, then according to an embodiment of the present disclosure, performing a retransmission (e.g., transmission of an uplink MAC CE for reporting a sidelink-consistent LBT failure) can be prioritized so that the uplink MAC CE for reporting a sidelink-consistent LBT failure is sent first. For example, if the initial transmission of both the uplink MAC CE for reporting the Uu consistent LBT failure and the uplink MAC CE for reporting the sidelink consistent LBT failure fails and / or if retransmission is about to be performed, and / or if a transmission conflict occurs between the two uplink MAC CEs, then according to an embodiment of the present disclosure, the uplink MAC CE for reporting the Uu consistent LBT failure can be prioritized, and the uplink MAC CE has a higher priority based on (for example, the priority of the uplink logical channel) so that the uplink MAC CE for reporting the Uu consistent LBT failure is sent first. For example, even if the logical channel (LCH) priority order between the uplink MAC CEs (or uplink logical channel (LCH) data) is the same, the uplink MAC CE for retransmission or the uplink logical channel (LCH) data can be prioritized and sent first. Furthermore, for example, if the logical channel (LCH) priority order between retransmitted uplink MAC CEs (or uplink logical channel (LCH) data) is the same, the UE (implemented by the UE) may determine which transmission the UE prioritizes.

[0402] For example, whether to apply (some) proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure may be configured (differently or independently) for each SL channel access priority category (CAPC). For example, whether to apply (some) proposed methods / rules and / or related parameters (e.g., thresholds) of 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, whether to apply (some) proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure may be specifically (or differently or independently) configured depending on whether frame-based LBT is applied. For example, whether to apply (some) proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure may be specifically (or differently or independently) configured depending on whether payload-based LBT is applied.

[0403] Whether to apply (some) proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure can be specifically (differently or independently) configured for whether LBT succeeds / failed, for each LBT-related energy detection level, for each side link channel (PSCCH / PSSCH, PSFCH, SL-SSB), for whether MCSt (multi-continuous time slot transmission) is applied, for whether multi-PSFCH timing is applied, for each order / position of each resource included in MCSt, for whether multiple starting points in a time slot are configured, for whether the first starting point (or second starting point) is applied, etc.

[0404] 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 for each resource pool (differently or independently). 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 for each congestion level (differently or independently). 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 for each service priority (differently or independently). 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 for each service type (differently or independently). 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 for each QoS requirement (e.g., latency, reliability) (differently or independently). 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 for each PQI (5G QoS Identifier (5QI) for PC5) (differently or independently). For example, whether to apply (some) of the proposed methods / rules and / or related parameters (e.g., thresholds) of 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 proposed methods / rules and / or related parameters (e.g., thresholds) of 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 proposed methods / rules and / or related parameters (e.g., thresholds) of the present disclosure may be configured (differently or independently) for each Tx profile (e.g., a Tx profile indicating that the service supports sidelink DRX operation or a Tx profile indicating that the service does not need to support sidelink DRX operation).

[0405] For example, depending on whether PUCCH configuration is supported (for example, when PUCCH resources are configured or when PUCCH resources are not configured), 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 resource pool (for example, a resource pool with PSFCH or a resource pool without PSFCH). 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 side link logical channel / logical channel group (or Uu logical channel or Uu logical channel group). 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 resource pool. 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 service / packet type. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each service / packet priority. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each QoS requirement (e.g., URLLC / EMBB service, reliability, delay). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each PQI. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each PFI. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each broadcast type (e.g., unicast, multicast, broadcast). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each (resource pool) congestion level (e.g., CBR). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured (differently or independently) for each SL HARQ feedback option (e.g., NACK feedback only, ACK / NACK feedback). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured specifically (or differently or independently) for a MAC PDU transmission enabled for HARQ feedback. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured specifically (or differently or independently) for a MAC PDU transmission disabled for HARQ feedback. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure may be configured specifically (or differently or independently) based on whether a PUCCH-based SL HARQ feedback reporting operation is configured.For example, it is possible to configure whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure specifically (or differently or independently) for preemption or depending on whether to perform resource reselection based on preemption. For example, it is possible to configure whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure specifically (or differently or independently) for reassessment or depending on whether to perform resource reselection based on reassessment. For example, it is possible to configure 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 (differently or independently). For example, it is possible to configure 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 (differently or independently). For example, it is possible to configure 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 pair and broadcast type) identifier (differently or independently). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each direction of the source layer ID and the target layer ID pair. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured (differently or independently) for each PC5 RRC connection / link. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured specifically (or differently or independently) depending on whether SL DRX is performed. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured specifically (or differently or independently) depending on whether SL DRX is supported. For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured specifically (or differently or independently) for each SL mode type (e.g., resource allocation mode 1 or resource allocation mode 2). For example, whether to apply the proposed rules and / or related parameter configuration values ​​of the present disclosure can be configured specifically (or differently or independently) for the case of performing (non-) periodic resource reservation. 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 each Tx profile (e.g., a Tx profile indicating that the service supports sidelink DRX operation or a Tx profile indicating that the service does not need to support sidelink DRX operation).

[0406] It is proposed that the rules (and / or related parameter configuration values) proposed in the present disclosure may also be applied to mmWave SL operations.

[0407] Fig.16 A process for performing wireless communication related to LBT based on an embodiment of the present disclosure is shown. Fig.16 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0408] Reference Fig.16 According to an embodiment of the present disclosure, for example, a UE (eg, a TX UE) may obtain information related to a resource set (eg, a resource / channel / RB (resource block) set, etc.) within a shared spectrum (ie, an unlicensed band).

[0409] For example, (SL)LBT (Channel Access Procedure (CAP)) may be performed on a resource set (resource / channel / RB set).

[0410] For example, if (SL) LBT is performed, and (SL) transfer is not performed, then (SL) LBT failure may be detected (e.g., an indication of LBT failure may be obtained). For example, if (SL) LBT is performed (and (SL) LBT failure is not detected), then SL transfer may be performed.

[0411] For example, if a (SL)LBT failure is detected, the (SL)LBT timer may be (re)started.

[0412] For example, when a (SL)LBT failure is detected, the (SL)LBT counter may be incremented by one.

[0413] For example, if a threshold number of (SL)LBT failures are detected (when the (SL)LBT timer is running), a process for (SL)LBT failures (e.g., consistent (SL)LBT failure (regarding the corresponding resource set), switching of the corresponding resource set, (SL) consistent LBT failure recovery, a process for generating a (SL)LBT failure (report) MAC CE (e.g., a resource allocation process according to the mode 1 / mode 2 resource allocation mode, a scheduling request (SR), a buffer status report (BSR), etc.) may be triggered.

[0414] For example, the MAC CE for reporting a consistent (SL) LBT failure may be a MAC CE for reporting a consistent (SL) LBT failure (e.g., a resource set regarding a consistent (SL) LBT failure) to a base station. For example, the MAC CE for reporting a consistent (SL) LBT failure may include information for reporting a consistent (SL) LBT failure (e.g., a resource set regarding a consistent (SL) LBT failure) to a base station.

[0415] For example, the (Uu)LBT Failure (Report) MAC CE may be a MAC CE for reporting a consistent (Uu)LBT failure to a base station (e.g., information about a resource set for a consistent (Uu)LBT failure, base station information about a resource set in which a consistent (Uu)LBT failure occurs). For example, the (Uu)LBT Failure (Report) MAC CE may include information for reporting a consistent (Uu)LBT failure to a base station (e.g., information about a resource set for a consistent (Uu)LBT failure, base station information about a resource set in which a consistent (Uu)LBT failure occurs).

[0416] For example, the UE may apply the (UL) LCP procedure to the (UL) transmission. For example, the (UL) resources used for the (UL) transmission may accommodate a consistent (SL) LBT failure MAC CE according to the (SL) logical channel prioritization (LCP) procedure. For example, the (UL) resources used for the (UL) transmission may be available for a resource set that has not yet triggered a consistent LBT failure.

[0417] For example, the UE may generate a first MAC CE based on the triggering of a consistent (SL) LBT failure. For example, the UE may generate a first MAC CE based on the consistent (SL) LBT failure being triggered and the (SL) resources being able to accommodate the first MAC CE according to the logical channel prioritization (LCP) process. For example, the UE may generate a first MAC CE based on the fact that the (SL) LBT failure process has been triggered, and / or the (SL) resources being able to accommodate the first MAC CE according to the logical channel prioritization (LCP) process, and / or the (SL) resources being available for transmission of a resource set for which a consistent LBT failure has not yet been triggered.

[0418] For example, the UE may generate a MAC PDU to report a first MAC CE to the base station. For example, the UE may generate a MAC PDU based on a logical channel prioritization (LCP) process. For example, the logical channel prioritization (LCP) process may be performed based on prioritization between a MAC service data unit (SDU) and a MAC CE. For example, if there are multiple MAC SDUs and / or MAC CEs to be sent, the multiple MAC SDUs and / or MAC CEs may be included (multiplexed) in the MAC PDU in order of increasing priority. For example, as a result of the logical channel prioritization (LCP) process, the MAC PDU may include (multiplex) a (SL) LBT failure MAC CE. For example, as a result of the LCP process, the MAC PDU may not include (multiplex) a first MAC CE to indicate a consistent (SL) LBT failure.

[0419] For example, based on the trigger of consistent (SL) LBT failure, the UE may perform UL transmission (e.g., UL transmission of a first MAC CE indicating a consistent (SL) LBT failure, UL transmission of a MAC PDU including (multiplexing) the first MAC CE indicating a consistent (SL) LBT failure). For example, the UE may perform UL transmission (e.g., UL transmission of an LBT failure MAC CE indicating a (consistent) (Uu) LBT failure, UL transmission of a MAC PDU including (multiplexing) an LBT MAC CE indicating a (consistent) (Uu) LBT failure) based on the trigger of consistent (Uu) LBT failure and / or based on the trigger of consistent (SL) LBT failure.

[0420] Fig.17 A process for performing wireless communication related to LBT 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.

[0421] Reference Fig.17 According to an embodiment of the present disclosure, for example, a priority order between the MAC CE and the MAC SDU proposed in the present disclosure may be proposed. In addition, an embodiment of how to generate a MAC PDU may be proposed. For example, data from a common control channel (UL-CCCH) may have the highest priority, followed by a MAC CE for SL configuration authorization confirmation, followed by a MAC CE for (Uu) LBT failure, and followed by the first MAC CE for indicating a (consistent) SL LBT failure, and then data from logical channels other than UL-CCCH (e.g., dedicated control channel (UL-DCCH), dedicated traffic channel (UL-DTCH)) may be prioritized.

[0422] Reference Fig.17 , for example, in the order of precedence Fig.17 On the left side, blocks with solid lines (borders) represent MAC CEs or MAC SDUs pending / triggered to be included in the MAC PDU at the MAC layer. For example, it can be assumed that data from the UL-CCCH, the (Uu) LBT failure MAC CE, and the first MAC CE indicating a (consistent) SL LBT failure are pending (triggered) at the MAC layer.

[0423] Reference Fig.17On the right side of the MAC PDU, for example, a MAC PDU may be presented, wherein the horizontal length of the MAC PDU block may represent the space of the MAC PDU described in the present disclosure. For example, it may be explained that there is not enough space in the MAC PDU to include all data from the UL-CCCH, the (Uu) LBT failure MAC CE, and the first MAC CE indicating a (consistent) SL LBT failure in the MAC PDU. For example, through the LCP process, the MAC layer may include MAC CEs in the MAC PDU in an order of higher priority first, and if there is insufficient space, a MAC PDU may be generated without including a lower priority MAC CE or MAC SDU. For example, because the remaining space in the MAC PDU is insufficient to include the first MAC CE indicating a (consistent) SL LBT failure (which is the lowest priority of pending MAC CEs or MAC SDUs at the MAC layer), the MAC layer may generate a MAC PDU that only includes data from the UL-CCCH and the (Uu) LBT failure MAC CE. For example, if the MAC layer may not have sufficient remaining space in the MAC PDU to include a (Uu)LBT Failure MAC CE (which is a lower priority of a pending MAC CE or MAC SDU), the MAC layer may generate a MAC PDU by including only data from the UL-CCCH.

[0424] Therefore, according to an embodiment of the present disclosure, for example, a process for an uplink transmission having a relatively high transmission importance may take precedence over a process for a sidelink transmission having a relatively low transmission importance. For example, an uplink transmission having a higher importance (e.g., an ultra-reliable and low-latency communication (URLLC) service) may have an absolutely higher transmission priority than a sidelink transmission, and a process for an uplink transmission having a higher importance may take precedence over a process for a sidelink transmission (e.g., via an LCP process).

[0425] In addition, according to an embodiment of the present disclosure, for example, in the event of a conflict between uplink transmission and sidelink transmission, the prioritization rules regarding which UL / SL transmissions are prioritized may be more adaptive. For example, the priority of uplink data and the uplink priority threshold (e.g., ul-PrioritizationThres: a threshold used for UL / SL prioritization to determine whether uplink data can be prioritized), and if the priority value of the uplink data is less than the uplink priority threshold, the uplink data can be prioritized (without first comparing the priority of the sidelink data and the sidelink threshold with each other), and / or the uplink data can be sent first. For example, if the priority of the uplink data is greater than the uplink priority threshold, the priority of the sidelink data can be prioritized by comparing the priority of the sidelink data with the sidelink priority threshold (e.g., sl-PrioritizationThres: a threshold used to determine whether SL TX has a higher priority than UL TX), and if the priority value of the sidelink data is less than the sidelink priority threshold, the sidelink data can be prioritized, and / or the sidelink data can be sent first. For example, by more adaptively following such prioritization rules, uplink transmissions may be more substantially prioritized within the unlicensed band.

[0426] And, according to one embodiment of the present disclosure, for example, the reset (reconfiguration) of the resource set for Uu LBT can take precedence over the reset (reconfiguration) of the resource set for SL LBT. For example, the purpose of reporting a consistent LBT failure can be to request a reset (reconfiguration) to a new resource set (of the sending UE) (for example, consistent LBT failure recovery) from the base station when the sending UE uses a resource set (for example, a RB set) to perform transmission, and when a (consistent) LBT failure occurs for the resource set. Therefore, for example, by performing a MAC PDU generation process for an LBT failure MAC CE for consistent Uu LBT failure (the MAC PDU generation process takes precedence over the MAC PDU generation process for the first MAC CE for consistent SL LBT failure), the LBT failure recovery process for uplink transmission can take precedence over the LBT failure recovery process for SL transmission.

[0427] Fig.18 A method for performing wireless communication by a first device according to an embodiment of the present disclosure is shown. Fig.18 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0428] Reference Fig.18According to an embodiment of the present disclosure, in step S1810, for example, the first device may obtain information related to a resource set in a shared spectrum. In step S1820, for example, the first device may perform a sidelink (SL) listen-before-talk (LBT) with respect to a resource set in a shared spectrum. In step S1830, for example, the first device may trigger a consistent SL LBT failure based on a counter related to a failure of SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, a priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to a priority of a second MAC CE for indicating a consistent UuLBT failure.

[0429] Additionally or alternatively, the first MAC CE may include information for indicating a resource set for consistent SL LBT failure.

[0430] Additionally or alternatively, the first MAC CE may include information for reporting a consistent SL LBT failure to the base station.

[0431] Additionally or alternatively, the priority of the first MAC CE may be higher than the priority of a MAC CE for a prioritized SL buffer status report (SL-BSR).

[0432] Additionally or alternatively, the priority of the first MAC CE may be lower than the priority of the configuration grant (CG) confirmation MAC CE.

[0433] Additionally or alternatively, the priority of the first MAC CE may be higher than the priority of the MAC CE for reporting the timing advance.

[0434] Additionally or alternatively, the priority of the first MAC CE may be lower than the priority of data from the uplink (UL) to the common control channel (CCCH).

[0435] Additionally or alternatively, a scheduling request (SR) for the second MAC CE may be triggered.

[0436] Additionally or alternatively, the SR may be prioritized based on the priority of the first MAC CE being lower than the priority of the second MAC CE.

[0437] Additionally or alternatively, the first MAC CE may be generated based on being triggered by a consistent SL LBT failure.

[0438] Additionally or alternatively, the first MAC CE for retransmission may take precedence over the second MAC CE for retransmission.

[0439] Additionally or alternatively, the second MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0440] Additionally or alternatively, the second MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0441] Additionally or alternatively, the first MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0442] The proposed method may be applicable to devices according to various embodiments of the present disclosure. First, the memory (104) of the first device (100) may store instructions that cause the first device (100) (e.g., processor (102), transceiver (106)) to perform operations based on being executed by the processor (102). For example, the operations may include at least one of the following items: obtaining information related to resource sets in a shared spectrum by the first device (e.g., processor (102), transceiver (106)); performing sidelink (SL) listen-before-talk (LBT) on resource sets in the shared spectrum; and / or triggering a consistent SL LBT failure based on a counter related to a failure of SL LBT reaching a threshold, for example, in a logical channel prioritization (LCP) process, the priority of a first media access control (MAC) control element (CE) used to indicate a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE used to indicate a consistent Uu LBT failure.

[0443] In an embodiment, a first device for performing wireless communication may be provided. The first device includes at least one processor; at least one transceiver; and at least one memory, which is capable of being operably connected to the at least one processor and storing instructions, which instructions, based on being executed by the at least one processor, cause the first device to perform operations including at least one of the following items: obtaining information related to resource sets in a shared spectrum; performing sidelink (SL) listen-before-talk (LBT) with respect to resource sets in the shared spectrum; and / or triggering a consistent SL LBT failure based on a counter related to a failure of SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, the priority of a first media access control (MAC) control element (CE) used to indicate a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE used to indicate a consistent Uu LBT failure.

[0444] In an embodiment, a device configured to control a first device may be provided. The device includes: at least one processor; and at least one memory, the at least one memory connected to the at least one processor and storing instructions, the instructions, based on being executed by the at least one processor, causing the first device to perform operations including at least one of the following items: obtaining information related to a resource set in a shared spectrum; performing sidelink (SL) listen-before-talk (LBT) on a resource set in a shared spectrum; and / or triggering a consistent SL LBT failure based on a counter related to a failure of SL LBT reaching a threshold, for example, in a logical channel prioritization (LCP) process, a priority of a first media access control (MAC) control element (CE) used to indicate a consistent SL LBT failure may be less than or equal to a priority of a second MAC CE used to indicate a consistent Uu LBT failure.

[0445] In an embodiment, a non-transitory computer-readable storage medium storing instructions may be provided. The instructions, based on being executed by at least one processor, cause a first device to perform operations including at least one of the following: obtaining information related to a resource set in a shared spectrum; performing sidelink (SL) listen-before-talk (LBT) on a resource set in a shared spectrum; and / or triggering a consistent SL LBT failure based on a counter related to a failure of SL LBT reaching a threshold, for example, in a logical channel prioritization (LCP) process, a priority of a first media access control (MAC) control element (CE) used to indicate a consistent SL LBT failure may be less than or equal to a priority of a second MAC CE used to indicate a consistent Uu LBT failure.

[0446] Fig.19 A method for performing wireless communication by a second device according to an embodiment of the present disclosure is shown. Fig.19 The embodiments of the present disclosure may be combined with various embodiments of the present disclosure.

[0447] Reference Fig.19 According to an embodiment of the present disclosure, in step S1910, the second device may obtain information related to a resource set in a shared spectrum. For example, a sidelink (SL) listen-before-talk (LBT) may be performed on a resource set in a shared spectrum. For example, a consistent SL LBT failure may be triggered based on a counter related to a failure of SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, a priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to a priority of a second MAC CE for indicating a consistent Uu LBT failure.

[0448] Additionally or alternatively, the first MAC CE may include information for indicating a resource set for consistent SL LBT failure.

[0449] Additionally or alternatively, the first MAC CE may include information for reporting a consistent SL LBT failure to the base station.

[0450] Additionally or alternatively, the priority of the first MAC CE may be higher than the priority of a MAC CE for a prioritized SL buffer status report (SL-BSR).

[0451] Additionally or alternatively, the priority of the first MAC CE may be lower than the priority of the configuration grant (CG) confirmation MAC CE.

[0452] Additionally or alternatively, the priority of the first MAC CE may be higher than the priority of the MAC CE for reporting the timing advance.

[0453] Additionally or alternatively, the priority of the first MAC CE may be lower than the priority of data from the uplink (UL) to the common control channel (CCCH).

[0454] Additionally or alternatively, a scheduling request (SR) for the second MAC CE may be triggered.

[0455] Additionally or alternatively, the SR may be prioritized based on the priority of the first MAC CE being lower than the priority of the second MAC CE.

[0456] Additionally or alternatively, the first MAC CE may be generated based on being triggered by a consistent SL LBT failure.

[0457] Additionally or alternatively, the first MAC CE for retransmission may take precedence over the second MAC CE for retransmission.

[0458] Additionally or alternatively, the second MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0459] Additionally or alternatively, the second MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0460] Additionally or alternatively, the first MAC CE for retransmission may take precedence over the first MAC CE for initial transmission.

[0461] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, one or more memories 204 of the second device 200 may store instructions that cause the second device (e.g., one or more processors 202, one or more transceivers 206) to perform operations based on being executed by one or more processors 202. For example, the operation of the second device (e.g., processor 202, transceiver 206) may include at least one of the following items: obtaining information related to resource sets in a shared spectrum, wherein sidelink (SL) listen-before-talk (LBT) is performed on the resource sets in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter related to the failure of the SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, the priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE for indicating a consistent Uu LBT failure.

[0462] According to an embodiment of the present disclosure, a second device suitable for performing wireless communication may be proposed. For example, the second device may include: one or more processors; one or more transceivers; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions, which, based on being executed, cause the second device to perform operations. For example, the operation may include at least one of the following items: obtaining information related to a resource set in a shared spectrum, wherein a sidelink (SL) listen-before-talk (LBT) is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter related to a failure of the SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, the priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE for indicating a consistent Uu LBT failure.

[0463] According to an embodiment of the present disclosure, a processing device suitable for controlling a second device may be proposed. For example, the processing device may include: one or more processors; and one or more memories, the one or more memories being operably connected to the one or more processors and storing instructions, which, based on being executed, cause the second device to perform an operation. For example, the operation may include at least one of the following items: obtaining information related to a resource set in a shared spectrum, wherein a sidelink (SL) listen-before-talk (LBT) is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter related to a failure of the SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, the priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE for indicating a consistent Uu LBT failure.

[0464] According to an embodiment of the present disclosure, at least one non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions cause a second device to perform an operation based on being executed by at least one processor. For example, the operation may include at least one of the following items: obtaining information related to a resource set in a shared spectrum, wherein a sidelink (SL) listen-before-talk (LBT) is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter related to a failure of the SL LBT reaching a threshold. For example, in a logical channel prioritization (LCP) process, the priority of a first MAC CE for indicating a consistent SL LBT failure may be less than or equal to the priority of a second MAC CE for indicating a consistent Uu LBT failure.

[0465] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0466] The various descriptions, functions, processes, proposals, methods and / or operational flows of the present disclosure described herein may be applied to, but not limited to, various fields requiring wireless communication / connection between devices (e.g., 5G).

[0467] 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.

[0468] Fig. 20 A communication system 1 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.

[0469] Reference Fig. 20, 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 (HMDs), head up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0470] Here, in addition to LTE, NR and 6G, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may also include a narrowband Internet of Things for low-power communication. In this case, for example, the NB-IoT technology may be an example of a low-power wide area network (LPWAN) technology, and may be implemented as a standard such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above names. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN, and may be referred to as various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication and / or 7) LTE M, 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.

[0471] 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., side link 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.

[0472] 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.

[0473] Fig.21 A wireless device 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.

[0474] Reference Fig.21 , 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. 20 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in.

[0475] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may also additionally include one or more transceivers 106 and / or one or more antennas 108. The (one or more) processors 102 may control the (one or more) memories 104 and / or the (one or more) transceivers 106, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 102 may process the information in the (one or more) memories 104 to generate first information / signals, and then transmit 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 a second information / signal 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) memory 104 may store software code including commands for executing part or all of the processing controlled by (one or more) processor 102 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, (one or more) processor 102 and (one or more) memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). (One or more) transceiver 106 may be connected to (one or more) processor 102 and send and / or receive radio signals through (one or more) antenna 108. Each transceiver 106 may include a transmitter and / or a receiver. (One or more) transceiver 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.

[0476] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may also additionally include one or more transceivers 206 and / or one or more antennas 208. The (one or more) processors 202 may control the (one or more) memories 204 and / or the (one or more) transceivers 206, and may be configured to implement the descriptions, functions, processes, proposals, methods and / or operation flows disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then send a radio signal including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive a radio signal including 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. (One or more) memory 204 can be connected to (one or more) processors 202, and can store various information related to the operation of (one or more) processors 202. For example, (one or more) memory 204 can store software code including commands for executing part or all of the processing controlled by (one or more) processors 202 or for executing the description, function, process, proposal, method and / or operation flow disclosed in this document. Here, (one or more) processors 202 and (one or more) memory 204 can be part of a communication modem / circuit / chip designed to implement RAT (e.g., LTE or NR). (One or more) transceivers 206 can be connected to (one or more) processors 202, and send 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 can be used interchangeably with (one or more) RF units. In the present disclosure, a wireless device can represent a communication modem / circuit / chip.

[0477] 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 descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operating procedures disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, 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 signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206, and obtain the PDU, SDU, message, control information, data, or information according to the description, function, process, proposal, method, and / or operation flow disclosed in this document.

[0478] 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 perform 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 codes, commands and / or command sets.

[0479] 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, register, cash memory, computer-readable storage medium, and / or a combination 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.

[0480] 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 of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0481] Fig. 22 A signal processing circuit for transmitting a signal according to an embodiment of the present disclosure is shown. Fig. 22 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0482] Reference Fig. 22 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. 22 Operation / function, not limited to Fig.21The processor (102, 202) and / or transceiver (106, 206) of Fig.21 The processor (102, 202) and / or the transceiver (106, 206) are implemented Fig. 22 For example, you can Fig.21 The processor (102, 202) implements blocks 1010 to 1060. Alternatively, Fig.21 The processor (102, 202) implements blocks 1010 to 1050 and can be implemented by Fig.21 The transceiver (106, 206) is used to implement box 1060.

[0483] Can be through Fig. 22 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).

[0484] 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.

[0485] 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.

[0486] Can Fig. 22 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.21 100, 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.

[0487] Fig.23 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. 20 ). Fig.23 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0488] Reference Fig.23 , the wireless device (100, 200) may correspond to Fig.21 The wireless device (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 storage 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.21 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.21The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 can control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the storage unit 130. The control unit 120 can send the information stored in the storage 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 storage unit 130.

[0489] 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. 20 100a), vehicles ( Fig. 20 100b-1 and 100b-2), XR devices ( Fig. 20 100c), handheld device ( Fig. 20 100d), household appliances ( Fig. 20 100e), IoT devices ( Fig. 20 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. 20 400), BS( Fig. 20 200), network nodes, etc. Depending on the use case / service, the wireless device can be used in a mobile or fixed place.

[0490] exist Fig.23In 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 within 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 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.

[0491] Hereinafter, the implementation will be described in detail with reference to the accompanying drawings. Fig.23 .

[0492] Fig.24 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.24 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0493] Reference Fig.24 , the handheld device 100 may include an antenna unit (108), a communication unit 110, a control unit 120, a storage 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.23 Frame 110 to 130 / 140.

[0494] 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 storage unit 130 may store data / parameters / programs / codes / commands required to drive the handheld device 100. The storage 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.

[0495] 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 storage 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 storage unit 130, and can be output as various types (e.g., text, voice, image, video, or tactile) through the I / O unit 140.

[0496] Fig.25 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.25 The embodiments of the present invention can be combined with various embodiments of the present disclosure.

[0497] Reference Fig.25 , 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.23 Frame 110 / 130 / 140.

[0498] 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 / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technology for maintaining the lane in which the vehicle is traveling, technology for automatically adjusting the speed (e.g., adaptive cruise control), technology for autonomously driving along a determined path, technology for driving by automatically setting a path when a destination is set, and the like.

[0499] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 can control the drive unit 140a so that the vehicle or the autonomous vehicle 100 can 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 can aperiodically / periodically obtain the latest traffic information data from the external server and obtain the surrounding traffic information data from the adjacent vehicle. In the middle of autonomous driving, the sensor unit 140c can obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, autonomous driving path and / or driving plan to the external server. The external server can predict traffic information data based on the information collected from the vehicle or autonomous vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0500] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or performed in a device, and the technical features in the device claims can be combined to be implemented or performed in a method. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a device. In addition, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or performed in a method.

Claims

1. A method for performing wireless communication by a first device, the method comprising: obtaining information associated with a set of resources in a shared spectrum; performing a sidelink SL listen-before-talk LBT on the resource set in the shared spectrum; as well as triggering a consistent SL LBT failure based on a counter associated with the failure of said SL LBT reaching a threshold, In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

2. The method according to claim 1, wherein: The first MAC CE includes information for indicating a resource set for the consistent SLLBT failure.

3. The method according to claim 1, wherein: The first MAC CE includes information for reporting the consistent SL LBT failure to the base station.

4. The method according to claim 1, wherein: The priority of the first MAC CE is higher than the priority of a MAC CE for a prioritized SL buffer status report SL-BSR.

5. The method according to claim 1, wherein: The priority of the first MAC CE is lower than the priority of the configuration authorization CG confirmation MAC CE.

6. The method according to claim 1, wherein: The priority of the first MAC CE is higher than the priority of a MAC CE for reporting a timing advance.

7. The method according to claim 1, wherein: The priority of the first MAC CE is lower than the priority of data from the uplink UL to the common control channel CCCH.

8. The method according to claim 1, further comprising: triggering a scheduling request SR for the second MAC CE; and Wherein, based on the fact that the priority of the first MAC CE is lower than the priority of the second MAC CE, the SR is prioritized.

9. The method according to claim 1, further comprising: Based on the consistent SL LBT failure being triggered, the first MAC CE is generated.

10. The method according to claim 1, wherein: The first MAC CE used for retransmission takes precedence over the second MAC CE used for retransmission.

11. The method according to claim 1, wherein: The second MAC CE for retransmission takes precedence over the first MAC CE for initial transmission.

12. The method according to claim 1, wherein: The first MAC CE for retransmission takes precedence over the second MAC CE for initial transmission.

13. The method according to claim 1, wherein: The first MAC CE for retransmission takes precedence over the first MAC CE for initial transmission.

14. A first device for performing wireless communication, the first device comprising: at least one processor; at least one transceiver; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following upon being executed by the at least one processor: obtaining information associated with a set of resources in a shared spectrum; performing a sidelink (SL) listen-before-talk (LBT) on the set of resources in the shared spectrum; and triggering a consistent SL LBT failure based on a counter associated with the failure of said SL LBT reaching a threshold, In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

15. An apparatus adapted to control a first device, the apparatus comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the first device to perform operations including the following upon being executed by the at least one processor: obtaining information associated with a set of resources in a shared spectrum; performing a sidelink (SL) listen-before-talk (LBT) on the set of resources in the shared spectrum; and triggering a consistent SL LBT failure based on a counter associated with the failure of said SL LBT reaching a threshold, In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

16. A non-transitory computer-readable storage medium storing instructions, the instructions, upon being executed by at least one processor, causing a first device to perform operations comprising: obtaining information associated with a set of resources in a shared spectrum; performing a sidelink (SL) listen-before-talk (LBT) on the set of resources in the shared spectrum; and triggering a consistent SL LBT failure based on a counter associated with the failure of said SL LBT reaching a threshold, in, In the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

17. A method for performing wireless communication by a second device, the method comprising: obtaining information related to a set of resources in a shared spectrum, wherein a side link SL listen-before-talk LBT is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter associated with the failure of the SL LBT reaching a threshold, and In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

18. A second device for performing wireless communication, the second device comprising: at least one processor; at least one transceiver; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations including the following upon being executed by the at least one processor: obtaining information related to a set of resources in a shared spectrum, wherein a side link SL listen-before-talk LBT is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter associated with the failure of the SL LBT reaching a threshold, and In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

19. An apparatus adapted to control a second device, the apparatus comprising: at least one processor; as well as at least one memory connected to the at least one processor and storing instructions, the instructions causing the second device to perform operations including the following upon being executed by the at least one processor: obtaining information related to a set of resources in a shared spectrum, wherein a side link SL listen-before-talk LBT is performed on the resource set in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter associated with the failure of the SL LBT reaching a threshold, and In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

20. A non-transitory computer-readable storage medium storing instructions, the instructions, upon being executed by at least one processor, causing a second device to perform operations comprising: obtaining information related to a set of resources in a shared spectrum, in, performing a sidelink SL listen-before-talk (LBT) on the set of resources in the shared spectrum, and wherein a consistent SL LBT failure is triggered based on a counter associated with the failure of the SL LBT reaching a threshold, and In which, in the logical channel prioritization LCP process, the priority of the first media access control MAC control element CE used to indicate the consistent SL LBT failure is less than or equal to the priority of the second MAC CE used to indicate the consistent Uu LBT failure.

Images