Method and apparatus for CPE-based sidelink communication in unlicensed spectrum

Abstract

A method for a first device to perform wireless communication and a device supporting the same are provided. The method may comprise the steps of: acquiring information related to a plurality of cyclic prefix extension (CPE) start candidate positions; selecting a CPE start position from among the plurality of CPE start candidate positions based on a priority of a sidelink (SL) transmission; and transmitting the SL based on the CPE start location.

Description

Technical Field

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

[0002] A sidelink (SL) refers to a communication method in which a direct link is configured between user equipments (UEs), and voice or data is directly exchanged between the UEs without passing through a base station (BS). Considering SL as a solution to the burden on the BS caused by the rapid increase in data traffic. Vehicle-to-everything (V2X) refers to a communication technology that exchanges information with other vehicles, pedestrians, and objects equipped with infrastructure through wired / wireless communication. V2X can be classified into four types: vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). V2X communication can be provided through a PC5 interface and / or a Uu interface.

[0003] In addition, since more and more communication devices require a larger communication capacity, the demand for enhanced mobile broadband communication relative to conventional radio access technologies (RAT) is increasing. Therefore, a communication system for services or user equipments (UEs) that are sensitive to reliability and latency is discussed. Moreover, a next-generation radio access technology based on improved mobile broadband communication, massive machine type communication (MTC), ultra-reliable low-latency communication (URLLC), etc. can be referred to as a new radio access technology (RAT) or new radio (NR). Summary of the Invention

[0004] Technical Solution

[0005] In an embodiment, a method for a first device to perform wireless communication is provided. The method may include: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

[0006] In an embodiment, a first device adapted to perform wireless communication is provided. The first device may include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

[0007] In an embodiment, a processing device adapted to control the first device is provided. The processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

[0008] In an embodiment, a non-transitory computer-readable storage medium storing instructions is provided. The instructions, when executed, may cause the first device to perform operations, the operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Illustrates a communication structure that may be provided in a 6G system based on embodiments of the present disclosure.

[0010] Figure 2 Illustrates an electromagnetic spectrum based on embodiments of the present disclosure.

[0011] Figure 3 Illustrates the structure of an NR system based on embodiments of the present disclosure.

[0012] Figure 4 Illustrates a radio protocol architecture based on embodiments of the present disclosure.

[0013] Figure 5 Illustrates the structure of a radio frame of NR based on embodiments of the present disclosure.

[0014] Figure 6 Illustrates the structure of a time slot of an NR frame based on embodiments of the present disclosure.

[0015] Figure 7 Shows an example of a BWP based on an embodiment of the present disclosure.

[0016] Figure 8 Shows the process of the UE performing V2X or SL communication based on the transmission mode according to an embodiment of the present disclosure.

[0017] Figure 9 Shows three cast types based on an embodiment of the present disclosure.

[0018] Figure 10 Shows interleaved RBs based on an embodiment of the present disclosure.

[0019] Figure 11 Shows a method for the UE to perform CPE based on an embodiment of the present disclosure.

[0020] Figure 12 Shows the problem of increased delay time due to channel sensing failure.

[0021] Figure 13 Shows multiple starting symbol positions or multiple starting time positions within a time slot based on an embodiment of the present disclosure.

[0022] Figure 14 Shows a method for a first device to perform wireless communication based on an embodiment of the present disclosure.

[0023] Figure 15 Shows a method for a second device to perform wireless communication based on an embodiment of the present disclosure.

[0024] Figure 16 Shows communication system 1 based on an embodiment of the present disclosure.

[0025] Figure 17 Shows a wireless device based on an embodiment of the present disclosure.

[0026] Figure 18 Shows a signal processing circuit for transmitting signals based on an embodiment of the present disclosure.

[0027] Figure 19 Shows another example of a wireless device based on an embodiment of the present disclosure.

[0028] Figure 20 Shows a handheld device based on an embodiment of the present disclosure.

[0029] Figure 21 Shows a vehicle or autonomous vehicle based on an embodiment of the present disclosure. Detailed Description

[0030] In the present disclosure, "A or B" may mean "only A", "only B", or "both A and B". In other words, in the present disclosure, "A or B" may be interpreted as "A and / or B". For example, in the present disclosure, "A, B, or C" may mean "only A", "only B", "only C", or "any combination of A, B, and C".

[0031] The slashes ( / ) or commas 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".

[0032] In the present disclosure, "at least one of A and B" may mean "only A", "only B", or "both A and B". Additionally, in the present disclosure, the expressions "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".

[0033] Additionally, in the present disclosure, "at least one of A, B, and C" may mean "only A", "only B", "only C", or "any combination of A, B, and C". Additionally, "at least one of A, B, or C" or "at least one of A, B, and / or C" may mean "at least one of A, B, and C".

[0034] Additionally, the parentheses used in the present disclosure may mean "for example". Specifically, when indicated as "control information (PDCCH)", this may mean presenting "PDCCH" as an example of "control information". In other words, the "control information" in the present disclosure is not limited to "PDCCH", and "PDDCH" may be presented as an example of "control information". Specifically, when indicated as "control information (i.e., PDCCH)", this may also mean presenting "PDCCH" as an example of "control information".

[0035] In the following description, "when, if, or in the case of" may be replaced by "based on".

[0036] The technical features separately described in one drawing in the present disclosure may be implemented separately or may be implemented simultaneously.

[0037] In the present disclosure, higher layer parameters may be parameters configured, pre-configured, or pre-defined for a UE. For example, a base station or network may send higher layer parameters to the UE. For example, higher layer parameters may be sent via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0038] 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 IEEE 802.16e-based systems. UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of the Evolved UMTS (E-UMTS) that uses E-UTRA. 3GPP LTE uses OFDMA in the downlink and SC-FDMA in the uplink. LTE-Advanced (LTE-A) is an evolution of LTE.

[0039] 5G NR is a follow-up technology to LTE-A corresponding to a new and innovative mobile communication system with characteristics such as high performance, low latency, high availability, etc. 5G NR can use resources of all available spectrums including low frequency bands below 1 GHz, intermediate frequency bands from 1 GHz to 10 GHz, and high frequencies (millimeter waves) above 24 GHz.

[0040] 6G (wireless communication) systems aim to have characteristics such as (i) very high data rates per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced power consumption of battery-less IoT devices, (vi) ultra-reliable connectivity, and (vii) networked intelligence with machine learning capabilities. The vision of 6G systems can include four aspects such as intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and 6G systems can meet the requirements shown in Table 1 below. That is, Table 1 shows the requirements of 6G systems.

[0041] [Table 1]

[0042]

[0043] The 6G system can have key factors such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), massive machine-type communication (mMTC), AI-integrated communication, tactile Internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0044] Figure 1 Illustrates the communication structure that can be provided in a 6G system according to an embodiment of the present disclosure. Figure 1 Embodiments of can be combined with various embodiments of the present disclosure.

[0045] The 6G system will have 50 times higher simultaneous wireless communication connectivity than the 5G wireless communication system. URLLC, which is a major function of 5G, will become an even more important technology by providing an end-to-end latency of less than 1 ms in 6G communication. Different from the frequently used spectral efficiency of the domain, the 6G system can have better volumetric spectral efficiency. The 6G system can provide advanced battery technology for energy harvesting and a very long battery life, and thus mobile devices in the 6G system may not need to be charged separately. In 6G, the new network characteristics can be as follows.

[0046] - Satellite integrated network: To provide a global mobile group, 6G will be integrated with satellites. Integrating terrestrial waves, satellites, and public networks into one wireless communication system may be very important for 6G.

[0047] - Interconnected intelligence: Different from the previous generations of wireless communication systems, 6G is innovative, and the wireless evolution may be updated from "connected things" to "connected intelligence". AI can be applied at each step of the communication process (or each signal processing process described below).

[0048] - Seamless integration of wireless information and energy transfer: The 6G wireless network can transfer electricity to facilitate charging the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transfer (WIET) will be integrated.

[0049] - Ubiquitous ultra-3D connectivity: Access to the network and core network functions of drones and very low Earth orbit satellites will establish ultra-3D connections in 6G ubiquity.

[0050] Among the new network characteristics of 6G, several general requirements are as follows.

[0051] - Small cell network: The concept of a small cell network is introduced to improve the received signal quality as a result of the improvement in throughput, energy efficiency, and spectral efficiency of the cellular system. Therefore, the small cell network is an essential feature of 5G and beyond 5G (5GB) communication systems. Therefore, the 6G communication system also adopts the characteristics of the small cell network.

[0052] - Ultra-dense heterogeneous network: Ultra-dense heterogeneous network will be another important feature of 6G communication systems. A multi-tier network composed of heterogeneous networks improves the overall QoS and reduces costs.

[0053] - High-capacity backhaul: Backhaul connections are characterized by high-capacity backhaul networks to facilitate high-capacity services. High-speed optical fibers and free-space optics (FSO) systems can be possible solutions to this problem.

[0054] - 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.

[0055] - Softwareization and virtualization: Softwareization and virtualization are two important functions that are the basis of the design process in 5G networks to ensure flexibility, reconfigurability, and programmability.

[0056] The core implementation technologies of 6G systems are described below.

[0057] - Artificial Intelligence (AI): The most important and newly introduced technology in 6G systems is AI. AI was not involved in 4G systems. 5G systems will support partial or very limited AI. However, 6G systems will support AI for full automation. Advancements in machine learning will create a more intelligent network for real-time communication in 6G. When AI is introduced into communication, real-time data transmission can be simplified and improved. AI can use numerous analyses to determine ways to perform complex target tasks. That is, AI can increase efficiency and reduce processing latency. Time-consuming operations such as handover, network selection, and resource scheduling can be immediately executed by AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine. Additionally, AI may be instant communication in brain-computer interfaces (BCIs). AI-based communication systems can be supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent cognitive radios, self-maintaining wireless networks, and machine learning.

[0058] - Terahertz (THz) Communication: The data rate can be increased by increasing the bandwidth. This can be achieved by using sub-TH communication with wide bandwidth and applying advanced massive MIMO technology. THz waves are called sub-millimeter radiation and generally indicate a frequency band between 0.1 THz and 10 THz with corresponding wavelengths in the range of 0.03 mm to 3 mm. The band range of 100 GHz to 300 GHz (sub-THz band) is regarded as the main part of the THz band for cellular communication. When the sub-THz band is added to the millimeter-wave band, the 6G cellular communication capacity increases. The defined THz band of 300 GHz to 3 THz is in the far-infrared (IR) frequency band. The band of 300 GHz to 3 THz is part of the optical band but is located at the boundary of the optical band and immediately follows the RF band. Therefore, the band of 300 GHz to 3 THz has similarities with RF. Figure 2 Shows the electromagnetic spectrum based on an embodiment of the present disclosure. Figure 2 Embodiments of can be combined with various embodiments of the present disclosure. The main features of THz communication include (i) a bandwidth that can be widely used to support very high data rates; and (ii) high path loss 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 BS operating in this band. Therefore, advanced adaptive arrangement techniques that can overcome range limitations can be used.

[0059] - Massive MIMO Technology (Large MIMO)

[0060] - Holographic Beamforming (HBF)

[0061] - Optical Wireless Technology

[0062] - Free Space Optical Backhaul Network (FSO Backhaul Network)

[0063] - Non-Terrestrial Network (NTN)

[0064] - Quantum Communication

[0065] - Cell-Free Communication

[0066] - Integration of Wireless Information and Power Transmission

[0067] - Integration of Wireless Communication and Sensing

[0068] - Integrated Access and Backhaul Network

[0069] - Big Data Analysis

[0070] - Reconfigurable Intelligent Surface

[0071] - Metaverse

[0072] - Blockchain

[0073] - Unmanned Aerial Vehicle (UAV): Unmanned Aerial Vehicle (UAV) or drone will be an important factor in 6G wireless communication. In most cases, UAV technology is used to provide high-speed wireless data connections. A base station entity is installed inside the UAV to provide cellular connectivity. UAVs have certain functions not found in fixed base station infrastructure, such as easy deployment, strong line-of-sight links, and freedom of mobility control. During emergency events such as natural disasters, it is economically unfeasible to deploy ground telecommunications infrastructure and sometimes it is unable to provide services in a turbulent environment. UAVs can easily handle such situations. UAVs will become a new paradigm in the field of wireless communication. This technology promotes the three basic requirements of wireless networks, such as eMBB, URLLC, and mMTC. UAVs can also be used for various 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 communication.

[0074] - Autonomous driving (self-driving): In order to achieve perfect autonomous driving, it is necessary to mutually notify dangerous situations through vehicle-to-vehicle communication and to check information such as parking information location and signal change time through communication between the vehicle and infrastructure such as parking lots and / or traffic lights. Vehicle-to-Everything (V2X) is the core element for building the 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), Vehicle-to-Infrastructure (V2I). In order to maximize the performance of autonomous driving and ensure high safety, high transmission speed and low latency technologies are required. In addition, in order to directly control a vehicle in a dangerous situation 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 with a faster transmission speed and lower latency than 5G because of the large amount of information to be sent and received.

[0075] For the sake of clarity in the specification, 5G NR is mainly described, but the technical idea according to the embodiments of the present disclosure is not limited thereto. Various embodiments of the present disclosure can also be applied to 6G communication systems.

[0076] Figure 3 Shows the structure of the NR system based on the embodiments of the present disclosure. Figure 3 Embodiments of can be combined with various embodiments of the present disclosure.

[0077] Reference Figure 3, the next-generation radio access network (NG-RAN) may include a BS 20 that provides user plane and control plane protocol termination 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 by other terms such as mobile station (MS), user terminal (UT), subscriber station (SS), mobile terminal (MT), wireless device, etc. For example, the BS may be referred to as a fixed station that communicates with the UE 10 and may be referred to by other terms such as base transceiver system (BTS), access point (AP), etc.

[0078] Figure 3 Embodiments illustrate the case where only gNBs are included. The BSs 20 may be interconnected via the Xn interface. The BSs 20 may be interconnected via the fifth-generation (5G) core network (5GC) and the NG interface. More specifically, the BS 20 may be connected to the access and mobility management function (AMF) 30 via the NG-C interface and may be connected to the user plane function (UPF) 30 via the NG-U interface.

[0079] The radio interface protocol layers between the UE and the network may be classified into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of the well-known Open Systems Interconnection (OSI) model in a 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 in the third layer controls the radio resources between the UE and the network. To this end, the RRC layer exchanges RRC messages between the UE and the BS layer.

[0080] Figure 4 Shows a radio protocol architecture based on an embodiment of the present disclosure. Figure 4 Embodiments may be combined with various embodiments of the present disclosure. Specifically, Figure 4 In (a) shows the radio protocol stack of the user plane for Uu communication, and Figure 4 In (b) shows the radio protocol stack of the control plane for Uu communication. Figure 4 In (c) shows the radio protocol stack of the user plane for SL communication, and Figure 4 In (d) shows the radio protocol stack of the control plane for SL communication.

[0081] Refer to Figure 4, The physical layer provides an information transfer service to the upper layer through physical channels. The physical layer is connected to the Medium Access Control (MAC) layer, which is the upper layer of the physical layer, through transport channels. Data is transferred between the MAC layer and the physical layer through transport channels. Transport channels are classified according to how data is transmitted through the radio interface and what characteristics of the data are transmitted.

[0082] Data is transferred through physical channels between different physical layers (i.e., the PHY layer of the transmitter and the PHY layer of the receiver). The physical channels can be modulated using the Orthogonal Frequency Division Multiplexing (OFDM) scheme, and the physical channels use time and frequency as radio resources.

[0083] The MAC layer provides services to the Radio Link Control (RLC) layer via logical channels, which is the upper layer of the MAC layer. The MAC layer provides the function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides the function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides a data transfer service through logical channels.

[0084] The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Units (RLC SDUs). To ensure different Quality of Service (QoS) required by radio bearers (RBs), the RLC layer provides three types of operation modes, namely, Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction through Automatic Repeat reQuest (ARQ).

[0085] The Radio Resource Control (RRC) layer is only defined 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. An RB is a logical path provided by the first layer (i.e., the physical layer or PHY layer) and the second layer (i.e., the MAC layer, RLC layer, Packet Data Convergence Protocol (PDCP) layer, and Service Data Adaptation Protocol (SDAP) layer) for data transfer between the UE and the network.

[0086] The functions of the Packet Data Convergence Protocol (PDCP) in the user plane include the transmission of user data, header compression, and encryption. The functions of the Packet Data Convergence Protocol (PDCP) in the control plane include the transmission of control plane data and encryption / integrity protection.

[0087] The Service Data Adaptation Protocol (SDAP) layer is only defined in the user plane. The SDAP layer performs the mapping between Quality of Service (QoS) flows and Data Radio Bearers (DRBs) and the QoS Flow ID (QFI) marking in both DL packets and UL packets.

[0088] The configuration of an RB means a process for specifying radio protocol layer and channel attributes to provide a specific service and for determining corresponding detailed parameters and operation methods. An RB can then be classified into two types, namely, a signaling radio bearer (SRB) and a data radio bearer (DRB). An SRB is used as a path for transmitting RRC messages in the control plane, and a DRB is used as a path for transmitting user data in the user plane.

[0089] When an RRC connection is established between the RRC layer of a UE and the RRC layer of an E-UTRAN, the UE is in the RRC connected (RRC_CONNECTED) state; otherwise, the UE may be in the RRC idle (RRC_IDLE) state. In the case of NR, an RRC inactive (RRC_INACTIVE) state is additionally defined, and a UE in the RRC_INACTIVE state can maintain its connection with the core network while releasing its connection with the BS.

[0090] 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 transmitting system information and a downlink shared channel (SCH) for transmitting other user services or control messages. Traffic or control messages for downlink multicast or broadcast services can be sent via the downlink SCH or can be sent via a separate downlink multicast channel (MCH). In addition, uplink transport channels for sending (or transmitting) data from the UE to the network include a random access channel (RACH) for sending an initial control message and an uplink shared channel (SCH) for sending other user services or control messages.

[0091] Examples of logical channels belonging to a higher layer of a transport channel and mapped to the 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.

[0092] Figure 5 Shows the structure of a radio frame of NR according to an embodiment of the present disclosure. Figure 5 Embodiments of can be combined with various embodiments of the present disclosure.

[0093] Reference Figure 5, in NR, radio frames can be used to perform uplink and downlink transmissions. The length of a radio frame is 10 ms and can be defined as consisting of two half-frames (HFs). A half-frame can include five 1 ms sub-frames (SFs). A sub-frame (SF) can be divided into one or more time slots, and the number of time slots within a sub-frame can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM(A) symbols according to the cyclic prefix (CP).

[0094] In the case of using normal CP, each time slot can include 14 symbols. In the case of using extended CP, each time slot can include 12 symbols. In this document, symbols can include OFDM symbols (or CP-OFDM symbols) and single-carrier FDMA (SC-FDMA) symbols (or discrete Fourier transform spread OFDM (DFT-s-OFDM) symbols).

[0095] Table 2 shown below represents the number of symbols (N slot symb ), the number of time slots per frame (N frame,μ slot ), and the number of time slots per sub-frame (N subframe ,μ slot ) based on the SCS configuration (μ) in the case of using normal CP or extended CP.

[0096] [Table 2]

[0097]

[0098] In the NR system, the OFDM(A) parameter sets (e.g., SCS, CP length, etc.) between multiple cells integrated into one UE can be configured differently. Therefore, the (absolute time) duration (or interval) of a time resource (e.g., sub-frame, time slot, or TTI) (collectively referred to as time unit (TU) for simplicity) composed of the same number of symbols can be configured differently in the integrated cells.

[0099] In NR, multiple parameter sets or SCSs can be supported to support various 5G services. For example, in the case where the SCS is 15 kHz, a wide range of traditional cellular bands can be supported, and in the case where the SCS is 30 kHz / 60 kHz, dense cities, lower latency, and wider carrier bandwidth can be supported. In the case where the SCS is 60 kHz or higher, in order to overcome phase noise, a bandwidth greater than 24.25 GHz can be used.

[0100] The NR frequency band can be defined as two different types of frequency ranges. The two different types of frequency ranges can be FR1 and FR2. The values of the frequency ranges can change (or vary). For example, the two different types of frequency ranges can be as shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean "the range below 6 GHz", and FR2 can mean "the range above 6 GHz", and can also be referred to as millimeter wave (mmW).

[0101] [Table 3]

[0102]

[0103] As described above, the values of the frequency ranges in the NR system can change (or vary). For example, as shown in Table 4 below, FR1 can include a bandwidth in the range of 410 MHz to 7125 MHz. More specifically, FR1 can include frequency bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher. For example, the frequency bands at 6 GHz (or 5850, 5900, 5925 MHz, etc.) and higher included in FR1 can include unlicensed bands. The unlicensed bands can be used for various purposes. For example, the unlicensed bands are used for vehicle-specific communications (e.g., autonomous driving).

[0104] [Table 4]

[0105]

[0106] Figure 6 Shows the structure of a time slot of an NR frame according to an embodiment of the present disclosure. Figure 6 The embodiments of can be combined with various embodiments of the present disclosure.

[0107] Refer to Figure 6 , a time slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, one time slot can include 14 symbols. For example, in the case of extended CP, one time slot can include 12 symbols. Alternatively, in the case of normal CP, one time slot can include 7 symbols. However, in the case of extended CP, one time slot can include 6 symbols.

[0108] 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)RB) in the frequency domain, and the 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 active BWP. Each element can be referred to as a resource element (RE) in a resource grid, and one complex symbol can be mapped to each element.

[0109] In the following, the bandwidth part (BWP) and the carrier will be described in detail.

[0110] The BWP can be a continuous set of physical resource blocks (PRBs) within a given parameter set. The PRBs can be selected from a continuous subset of common resource blocks (CRBs) for a given parameter set on a given carrier.

[0111] For example, the BWP can be at least any one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor the downlink radio link quality in DL BWPs other than the active DL BWP on the primary cell (PCell). For example, the UE may not receive a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), or a channel state information-reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for an inactive DL BWP. For example, the UE may not transmit a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH) outside the active UL BWP. For example, in the case of the downlink, the initial BWP can be given as a continuous RB set for the remaining minimum system information (RMSI) control resource set (CORESET) (configured by the physical broadcast channel (PBCH)). For example, in the case of the uplink, the initial BWP can be given by a system information block (SIB) for the random access procedure. For example, the default BWP can be configured by a higher layer. For example, the initial value of the default BWP can be the initial DL BWP. For power saving, if the UE cannot detect downlink control information (DCI) during a specified period, the UE can switch the active BWP of the UE to the default BWP.

[0112] In addition, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting UE can transmit an SL channel or an SL signal on a specific BWP, and a receiving UE can receive an SL channel or an SL signal on a specific BWP. In a licensed carrier, the SL BWP can be defined separately from the Uu BWP, and the SL BWP can have configuration signaling separate from the Uu BWP. For example, a UE can receive configuration for the SL BWP from the BS / network. For example, a UE can receive configuration for the Uu BWP from the BS / network. The SL BWP is (pre-)configured in the carrier for out-of-coverage NR V2X UEs and RRC_IDLE UEs. For a UE in the RRC_CONNECTED mode, at least one SL BWP can be activated in the carrier.

[0113] Figure 7 FIG. shows an example of a BWP according to an embodiment of the present disclosure. Figure 7 Embodiments of can be combined with various embodiments of the present disclosure. Assume that in Figure 7 the embodiment of, the number of BWPs is 3.

[0114] Refer to Figure 7 , a common resource block (CRB) can be a carrier resource block numbered from one end of a carrier band to the other end thereof. Additionally, a PRB can be a resource block numbered within each BWP. Point A can indicate a common reference point of a resource block grid.

[0115] A BWP can be configured by point A, an offset relative to point A (N start BWP ), and a bandwidth (N size BWP ). For example, point A can be an external reference point of the PRBs of a carrier, and subcarrier 0 of all parameter sets (e.g., all parameter sets supported by the network on the corresponding carrier) is aligned at point A. For example, the offset can be the PRB distance between the lowest subcarrier within a given parameter set and point A. For example, the bandwidth can be the number of PRBs within a given parameter set.

[0116] Hereinafter, V2X or SL communication will be described.

[0117] The sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) as SL-specific sequences. The PSSS may be referred to as the sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as the sidelink 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 S-SSS for detailed synchronization acquisition and for the detection of the synchronization signal ID.

[0118] The physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information that the UE must first know before SL signal transmission / reception. For example, the default information may be information related to SLSS, duplex mode (DM), time division duplex (TDD) uplink / downlink (UL / DL) configuration, information related to the resource pool, and the type of application related to SLSS, subframe offset, broadcast information, etc. For example, in order to evaluate the PSBCH performance, in NR V2X, the payload size of the PSBCH may be 56 bits, including a 24-bit cyclic redundancy check (CRC).

[0119] The S-PSS, S-SSS, and PSBCH can be included in a block format that supports periodic transmission (e.g., the SL synchronization signal (SS) / PSBCH block, hereinafter, the sidelink synchronization signal block (S-SSB)). The S-SSB may have the same parameter set (i.e., SCS and CP length) as the physical sidelink control channel (PSCCH) / physical sidelink shared channel (PSSCH) in the carrier, and the transmission bandwidth may exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (SB). For example, the PSBCH may span 11 RBs. Additionally, the frequency position of the S-SSB can be (pre-)configured. Thus, the UE does not have to perform hypothesis detection at the frequency to discover the S-SSB in the carrier.

[0120] Figure 8 A process of the UE performing V2X or SL communication based on a transmission mode according to an embodiment of the present disclosure is shown. Figure 8 Embodiments may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be referred to as a mode or a resource allocation mode. Hereinafter, for ease of explanation, in LTE, the transmission mode may be referred to as the LTE transmission mode. In NR, the transmission mode may be referred to as the NR resource allocation mode.

[0121] For example,Figure 8 In (a) shows UE operations related to LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, Figure 8 In (a) shows UE operations related to NR resource allocation mode 1. For example, LTE transmission mode 1 can be applied to conventional SL communication, and LTE transmission mode 3 can be applied to V2X communication.

[0122] For example, Figure 8 In (b) shows UE operations related to LTE transmission mode 2 or LTE transmission mode 4. Alternatively, for example, Figure 8 In (b) shows UE operations related to NR resource allocation mode 2.

[0123] Referring to Figure 8 In (a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, the base station can schedule SL resources to be used by the UE for SL transmission. For example, in step S800, the base station can send information related to the SL resources and / or information related to the UL resources to the first UE. For example, the UL resources can include PUCCH resources and / or PUSCH resources. For example, the UL resources can be resources for reporting SL HARQ feedback to the base station.

[0124] For example, the first UE can receive information related to dynamic grant (DG) resources and / or information related to configured grant (CG) resources from the base station. For example, the CG resources can include CG type 1 resources or CG type 2 resources. In the present disclosure, the DG resources can be resources configured / assigned to the first UE by the base station through downlink control information (DCI). In the present disclosure, the CG resources can be (periodic) resources configured / assigned 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 can 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 can send an RRC message including information related to the CG resources to the first UE, and the base station can send DCI related to the activation or release of the CG resources to the first UE.

[0125] In step S810, the first UE may transmit a PSCCH (e.g., sidelink control information (SCI) or first-level SCI) to the second UE based on resource scheduling. In step S820, the first UE may transmit a PSSCH (e.g., second-level SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second UE through the PSFCH. In step S840, the first UE may transmit / report the HARQ feedback information to the base station through 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 pre-configured rules. For example, the DCI may be DCI for SL scheduling. For example, the format of the DCI may be DCI format 3_0 or DCI format 3_1.

[0126] Reference Figure 8 Referring to (b) in, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the UE may determine the sidelink transmission resources within the sidelink resources configured by the base station / network or pre-configured sidelink resources. For example, the configured sidelink resources or pre-configured sidelink resources may be a resource pool. For example, the UE may autonomously select or schedule the resources for sidelink transmission. For example, the UE may perform sidelink communication by autonomously selecting the resources within the configured resource pool. For example, the UE may autonomously select resources within the selection window by performing a sensing process and a resource (re)selection process. For example, sensing can be performed on a subchannel basis. For example, in step S810, the first UE that has itself selected resources from the resource pool may transmit a PSCCH (e.g., sidelink control information (SCI) or first-level SCI) to the second UE by using the resources. In step S820, the first UE may transmit a PSSCH (e.g., second-level SCI, MAC PDU, data, etc.) related to the PSCCH to the second UE. In step S830, the first UE may receive a PSFCH related to the PSCCH / PSSCH from the second UE.

[0127] Reference Figure 8For (a) or (b) above, 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 SCI) to the second UE via the PSCCH and / or PSSCH. In this case, the second UE may decode the two consecutive SCIs (e.g., level 2 SCI) to receive the PSSCH from the first UE. In the present disclosure, the SCI sent via the PSCCH may be referred to as the first SCI, the first-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-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.

[0128] Hereinafter, an example of SCI format 1-A will be described.

[0129] SCI format 1-A is used to schedule the second-level SCI on the PSSCH and the PSSCH.

[0130] The following information is sent by means of SCI format 1-A:

[0131] - Priority - 3 bits

[0132] - Frequency resource allocation - When the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2, 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 to 3, ceiling log 2 (N SL subChannel (N SL subChannel + 1)(2N SL subChannel + 1) / 6) bits.

[0133] - Time resource allocation - When the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2, 5 bits; otherwise, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, 9 bits

[0134] - Resource reservation period - If the higher layer parameter sl-MultiReserveResource is configured, ceiling(log 2N rsv_period ), where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise, 0 bits

[0135] - DMRS pattern - ceiling(log 2 N pattern ), where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0136] - Second-level SCI format - 2 bits, as defined in Table 5

[0137] - Beta_offset indicator - 2 bits, as provided by the higher layer parameter sl-BetaOffsets2ndSCI

[0138] - Number of DMRS ports - 1 bit, as defined in Table 6

[0139] - Modulation and coding scheme - 5 bits

[0140] - 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 bits

[0141] - PSFCH overhead indication - 1 bit if the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise, 0 bits

[0142] - Reserved bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to zero.

[0143] [Table 5]

[0144]

[0145] [Table 6]

[0146]

[0147] In the following, an example of SCI format 2-A will be described.

[0148] SCI format 2-A is used for the decoding of PSSCH and is used together with HARQ operations when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0149] The following information is sent by means of SCI format 2-A:

[0150] - HARQ process number - 4 bits

[0151] - New data indicator - 1 bit

[0152] - Redundancy version - 2 bits

[0153] - Source ID - 8 bits

[0154] - Destination ID - 16 bits

[0155] - HARQ feedback enable / disable indicator - 1 bit

[0156] - Broadcast type indicator - 2 bits, as defined in Table 7

[0157] - CSI request - 1 bit

[0158] [Table 7]

[0159]

[0160] In the following, an example of SCI format 2-B will be described.

[0161] For HARQ operations, SCI format 2-B is used for the decoding of PSSCH when the HARQ-ACK information includes only NACK, or when there is no feedback of HARQ-ACK information.

[0162] The following information is sent by means of SCI format 2-B:

[0163] - HARQ process number - 4 bits

[0164] - New data indicator - 1 bit

[0165] - Redundancy version - 2 bits

[0166] - Source ID - 8 bits

[0167] - Destination ID - 16 bits

[0168] - HARQ feedback enable / disable indicator - 1 bit

[0169] - Region ID - 12 bits

[0170] - Communication range requirement - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0171] Reference Figure 8 In (a) or (b) of the reference, in step S830, the first UE may receive the PSFCH. For example, the first UE and the second UE may determine the PSFCH resource, and the second UE may use the PSFCH resource to send HARQ feedback to the first UE.

[0172] Reference Figure 8 In (a) of the reference, in step S840, the first UE may send SL HARQ feedback to the base station via the PUCCH and / or PUSCH.

[0173] Figure 9 Shows three broadcast types according to an embodiment of the present disclosure. Figure 9 The embodiments of may be combined with various embodiments of the present disclosure. Specifically, Figure 9 (a) in shows broadcast-type SL communication, Figure 9 (b) in shows unicast-type SL communication, and Figure 9 (c) in shows multicast-type SL communication. In the case of unicast-type SL communication, the UE may perform one-to-one communication for another UE. In the case of multicast-type SL transmission, the UE may perform SL communication for one or more UEs belonging to the group to which the UE belongs. In various embodiments of the present disclosure, SL multicast communication may be replaced by SL multiple-cast communication, SL one-to-many communication, etc.

[0174] Hereinafter, the hybrid automatic repeat request (HARQ) process will be described.

[0175] For example, SL HARQ feedback may be enabled for unicast. In this case, in non-codeblock 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 related to the PSCCH, the receiving UE may generate HARQ-ACK. Additionally, the receiving UE may send the HARQ-ACK to the sending UE. Otherwise, if the receiving UE cannot successfully decode the transport block after decoding the PSCCH whose target is the receiving UE, the receiving UE may generate HARQ-NACK. Additionally, the receiving UE may send the HARQ-NACK to the sending UE.

[0176] 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.

[0177] (1)Multicast Option 1: After the receiving UE decodes the PSCCH whose target is the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Otherwise, if the receiving UE decodes the PSCCH 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 a HARQ-ACK to the transmitting UE.

[0178] (2)Multicast Option 2: After the receiving UE decodes the PSCCH whose target is the receiving UE, if the receiving UE fails to decode the transport block associated with the PSCCH, the receiving UE may send a HARQ-NACK to the transmitting UE via the PSFCH. Additionally, 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 send a HARQ-ACK to the transmitting UE via the PSFCH.

[0179] For example, if Multicast Option 1 is used for SL HARQ feedback, all UEs performing multicast communication can share the PSFCH resources. For example, UEs belonging to the same group can send HARQ feedback by using the same PSFCH resources.

[0180] For example, if Multicast Option 2 is used for SL HARQ feedback, each UE performing multicast communication can use different PSFCH resources for HARQ feedback transmission. For example, UEs belonging to the same group can send HARQ feedback by using different PSFCH resources.

[0181] In this 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.

[0182] In the following, UE procedures for reporting HARQ-ACK on the sidelink will be described.

[0183] It can be indicated to the UE in one or more of N PSSCH subch subchannels by the SCI format received for scheduling the PSSCH to send a PSFCH with HARQ-ACK information in response to the PSSCH reception. The UE provides HARQ-ACK information including ACK or NACK or only NACK.

[0184] The number of time slots in the resource pool for the PSFCH transmission occasion resources can be provided to the UE by sl-PSFCH-Period-r16. If this number is zero, the PSFCH transmission from the UE in the resource pool is disabled. The UE expects that if k mod N PSFCH PSSCH = 0, then the time slot t' k SL (0 ≤ k < T' max ) has a PSFCH transmission occasion resource, where t' k SL is a time slot belonging to the resource pool, T' max is the number of time slots belonging to the resource pool within 10240 milliseconds, and N PSFCH PSSCH is provided by sl-PSFCH-Period-r16. The UE can be indicated by a higher layer not to send a PSFCH in response to PSSCH reception. If the UE receives a PSSCH in the resource pool and the HARQ feedback enable / disable indicator field in the associated SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information in the PSFCH transmission in the resource pool. The UE sends the PSFCH in the first time slot after at least the number of time slots provided by sl-MinTimeGapPSFCH-r16 in the resource pool that includes the PSFCH resources and after the last time slot of the PSSCH reception.

[0185] A set of M PRBs in the PRBs of the resource pool for PSFCH transmission is provided to the UE by sl-PSFCH-RB-Set-r16. For the number N of subchannels of the resource pool provided by sl-NumSubchannel PSFCH PRB,set and the number of PSSCH time slots associated with the PSFCH time slot that is less than or equal to N subch and the number of PSSCH time slots associated with the PSFCH time slot that is less than or equal to N PSFCH PSSCH , the UE allocates the [(i + j·N PRB,set PSFCH )·M PSFCH PSSCH to [(i + 1 + j·N PSFCH subch,slot )·M PSFCH PSSCH - 1] PRBs among the M PRBs to the time slot i and subchannel j among the PSSCH time slots associated with the PSFCH time slot, where M PSFCH subch,slot = M PSFCH subch,slot = M PSFCH PRB, set / (N subch ·N PSFCH PSSCH ), 0 ≤ i < N PSFCH PSSCH , 0 ≤ j < N subch , and the allocation starts in ascending order of i and continues in ascending order of j. The UE expects M PSFCH PRB,set to be a multiple of N subch ·N PSFCH PSSCH .

[0186] The UE determines the number of PSFCH resources available for multiplexing HARQ-ACK information in PSFCH transmission as R PSFCH PRB,CS = N PSFCH type ·M PSFCH subch,slot ·N PSFCH CS , where N PSFCH CS is the number of cyclic shift pairs for the resource pool and, based on a higher layer indication,

[0187] - N PSFCH type = 1 and M PSFCH subch,slot PRBs are associated with the starting subchannel of the corresponding PSSCH

[0188] -N PSFCH type = N PSSCH subch and N PSSCH subch ·M PSFCH subch,slot PRBs are associated with one or more of the N PSSCH subch subchannels of the corresponding PSSCH

[0189] The PSFCH resources are first indexed in ascending order of the PRB indices among the N PSFCH type ·M PSFCH subch,slot PRBs, and then indexed in ascending order of the cyclic shift pair indices among the N PSFCH CS cyclic shift pairs.

[0190] The UE determines the index of the PSFCH resource for PSFCH transmission in response to PSSCH reception as (PID +M ID ) mod R PSFCH PRB,CS , where P ID is the physical layer source ID provided by the SCI format 2-A or 2-B received by the scheduling PSSCH, and M ID is the identity of the UE that receives the PSSCH indicated by the higher layer when the UE detects the SCI format 2-A with the broadcast type indicator field value of "01"; otherwise M ID is zero.

[0191] The UE uses Table 8 to determine the m PSFCH CS value for calculating the cyclic shift α from the cyclic shift pair index corresponding to the PSFCH resource index and N 0 value.

[0192] [Table 8]

[0193]

[0194] In the case where the UE detects the SCI format 2-A with the broadcast type indicator field value of "01" or "10" as shown in Table 9, or in the case where the UE detects the SCI format 2-B or SCI format 2-A with the broadcast type indicator field value of "11" as shown in Table 10, the UE determines the m cs value for calculating the cyclic shift α. The UE applies one of the cyclic shifts in the cyclic shift pair to the sequence for PSFCH transmission.

[0195] [Table 9]

[0196]

[0197] [Table 10]

[0198]

[0199] Meanwhile, non - consecutive (equally spaced) RBs in frequency can be allocated to the UE. This set of non - consecutive RBs can be referred to as interleaved RBs. This may be useful in a spectrum (e.g., shared spectrum) subject to regulations such as occupied channel bandwidth (OCB), power spectral density (PSD).

[0200] Figure 10 Shows interleaved RBs based on an embodiment of the present disclosure. Figure 10 The embodiments of

[0201] can be combined with various embodiments of the present disclosure. Figure 10, the interleaving of RBs can be defined in the frequency domain. The interleaving m ∈ {0, 1, ..., M-1} can include (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M can represent the number of interleaved RBs given by Table 11.

[0202] [Table 11]

[0203]

[0204] A communication device (e.g., the devices, UEs, vehicles, drones, etc. proposed in various embodiments of the present disclosure) can transmit signals / channels by using one or more interleaved RBs.

[0205] Meanwhile, in the next-generation system, a UE can perform sidelink transmission operations and / or sidelink reception operations in the unlicensed band. Meanwhile, for operations in the unlicensed band, depending on band-specific regulations or requirements, a channel sensing operation (e.g., energy detection / measurement) for the channel to be used may be performed before the UE performs transmission. The UE can perform transmission in the unlicensed band only when it is determined that the set of channels or RBs to be used is idle as a result of channel sensing (e.g., if the measured energy is less than or equal to a specific threshold). If it is determined that the set of channels or RBs to be used is busy as a result of channel sensing (e.g., if the measured energy is greater than or equal to a specific threshold), the UE can cancel all or part of the transmission in the unlicensed band. Meanwhile, in the operations of the unlicensed band, the UE can skip or simplify the channel sensing operation (making the channel sensing interval relatively small) within a specific time after transmission for a specific time duration. On the other hand, after a specific time has elapsed after transmission, the UE can determine whether to transmit after performing a conventional channel sensing operation. Meanwhile, for transmissions in the unlicensed band, depending on regulations or requirements, the power spectral density (PSD) of the signals / channels transmitted by the UE and / or the size of the frequency occupancy domain and / or the time interval may be greater than or equal to a specific level, respectively. Meanwhile, in the unlicensed band, to simplify channel sensing, it can be notified through the channel occupancy time (COT) duration information that the channel obtained based on the initial general channel sensing is occupied within a specific time, and the maximum length of the COT duration can be configured differently depending on the priority value of the data packet or service.

[0206] Meanwhile, the base station can transmit the COT duration events obtained through channel sensing via DCI, and the UE can perform specific (indicated) channel sensing types and / or CP extensions within the COT duration based on the DCI information received from the base station. Meanwhile, the UE can share the COT duration obtained based on channel sensing with the base station that is the destination of the UE's UL transmission, and can provide relevant information via UL based on the configured grant uplink control information (CG-UCI). In the above scenarios, the base station can perform simplified channel sensing within the COT duration shared by the UE. Meanwhile, in the case of sidelink communication, there are scenarios where the UE receives information about the resources to be used for sidelink transmission from the base station via DCI or RRC signaling, such as mode 1 resource allocation (RA) operations, and there are scenarios where the UE performs sidelink transmission and reception based on inter-UE sensing operations without the assistance of the base station, such as mode 2 RA operations.

[0207] Meanwhile, in the case of channel access type 1, it can be used regardless of the channel occupancy time (COT) configuration, and DL transmission can be performed based on the procedures shown in Tables 12 to 13.

[0208] [Table 12]

[0209]

[0210]

[0211] [Table 13]

[0212]

[0213]

[0214] Meanwhile, for channel access type 1 that can be used regardless of the channel occupancy time (COT) configuration, UL transmission can be performed based on the procedures shown in Tables 14 to 15.

[0215] [Table 14]

[0216]

[0217]

[0218] [Table 15]

[0219]

[0220]

[0221] Meanwhile, Channel Access Type 2, which is a simplified channel access type, can be used within the Channel Occupancy Time (COT) before transmission, and DL transmission can be performed based on the procedure shown in Table 16.

[0222] [Table 16]

[0223]

[0224]

[0225]

[0226] Meanwhile, Channel Access Type 2, which is a simplified channel access type, can be used within the Channel Occupancy Time (COT) before transmission, and UL transmission can be performed based on the procedure shown in Table 17.

[0227] [Table 17]

[0228]

[0229]

[0230] In an embodiment of the present disclosure, Type 2A SL channel access can be the same as Type 2A DL and / or UL channel access. For example, Type 2A SL channel access can be performed within a sensing interval T_short_sl = 25 us, where the interval can consist of the duration T_f = 16 us of a sensing slot immediately following, and T_f can include a sensing slot at the start of T_f. The basic idle determination in Type 2A SL channel access can also borrow the idle determination from DL or UL channel access.

[0231] In an embodiment of the present disclosure, Type 2B SL channel access can be the same as Type 2B DL and / or UL channel access. For example, in the case of Type 2B SL channel access, the UE can perform transmission immediately after sensing that the channel is idle within a duration T_f = 16 us. T_f can include a sensing slot occurring within the last 9 us of T_f. The basic idle determination in Type 2B SL channel access can also borrow the idle determination from DL or UL channel access.

[0232] In an embodiment of the present disclosure, Type 2C SL channel access can be the same as Type 2C DL and / or UL channel access. For example, in the case of Type 2C SL channel access, the UE may not perform channel sensing. Instead, the time duration of the SL transmission can be at most 584 us.

[0233] In an embodiment of the present disclosure, the type 1 SL channel access may be the same as the type 1 DL and / or UL channel access. For example, the UE may randomly derive an integer value N based on the contention window size corresponding to the priority class. Then, if the channel sensing result within the delay duration T_d corresponding to the priority class is idle, the UE reduces the N - 1 counter value in units of T_sl when idle. If the counter value is zero, the UE may occupy the RB set or the channel where the channel sensing is performed. If it is determined that a part of the channel sensing result within the T_sl duration is busy, the UE may maintain the counter value until the channel sensing result within the delay duration T_d is idle, and the UE may continue to perform channel sensing. Above, the delay duration T_d may be composed of T_f = 16 us and m_p * T_sl consecutive after T_f = 16 us, where m_p may be a value determined by the priority (p), and T_sl = 9 us may be the time interval for performing channel sensing.

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

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

[0236] - For filling the buffer status report (BSR) and the recommended bit rate MAC CE, it is fixed to the lowest priority;

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

[0238] - Configured by the base station for SRB2 and DRB.

[0239] When selecting the CAPC of the DRB, the base station considers the fairness between other service types and transmissions, and at the same time considers the 5QI of all QoS flows multiplexed to the corresponding DRB. Table 10 shows which CAPC should be used for the standardized 5QI, that is, the CAPC for a given QoS flow. For the standardized 5QI, the CAPC is defined as shown in the following table, and for the non - standardized 5QI, the CAPC with the best QoS characteristics should be used.

[0240] [Table 18]

[0241]

[0242] Table 19 shows m p The minimum contention window (CW), the maximum CW, the maximum channel occupancy time (MCOT), and the allowed CW size vary depending on the channel access priority class in the DL.

[0243] [Table 19]

[0244]

[0245] Referring to Table 19, the contention window size (CWS), the maximum COT value, etc. for each CAPC can be defined. For example, T d can be equal to T f + m p * T sl (T d = T f + m p * T sl ).

[0246] Table 20 shows that in UL, mp, the minimum contention window (CW), the maximum CW, the maximum channel occupancy time (MCOT), and the allowed CW size vary depending on the channel access priority class.

[0247] [Table 20]

[0248]

[0249] Referring to Table 20, the contention window size (CWS), the maximum COT value, etc. for each CAPC can be defined. For example, T d can be equal to T f +m p *T sl (T d =T f +m p *T sl ).

[0250] In an embodiment of the present disclosure, when the UE accesses an already occupied channel through the type 1 SL channel, the UE may not be ready to send a sidelink transmission. In this case, the UE can configure a delay duration of length T_d and a sensing duration of length T_sl just before the sidelink transmission it is ready to send. Here, if both are idle, the UE can immediately perform the sidelink transmission, but if at least one of the delay duration and the sensing duration is busy, the UE can perform the type 1 SL channel access again. For example, if a sidelink transmission cannot be performed at the end of the channel sensing (e.g., if the end of the channel sensing is after the start of the sidelink transmission), the UE can reselect the sidelink transmission resources.

[0251] Meanwhile, when performing transmission on a shared spectrum band, a wireless device may send a Cyclic Prefix Extension (CPE) before (or together with) the transmission to achieve alignment of Orthogonal Frequency Division Multiplexing (OFDM) symbols and reduce Inter-Symbol Interference (ISI). Additionally, the UE may perform CPE transmission to increase the probability that a channel on which LBT has been successfully performed can be used for actual transmission. For example, if the UE succeeds in LBT on a specific channel, the UE may perform CPE transmission to prevent other devices from occupying that specific channel.

[0252] Figure 11 A method for a UE to perform CPE according to an embodiment of the present disclosure is shown. Figure 11 Embodiments of may be combined with various embodiments of the present disclosure.

[0253] Reference Figure 11 , in order to be able to align OFDM symbols, reduce ISI, increase the probability that a channel that has been successful in LBT can be used for actual transmission, and / or prevent a channel that has been successful in LBT from being occupied by other devices, the UE may perform CPE transmission before (or together with) the SL transmission.

[0254] Meanwhile, if two transmissions that start simultaneously cannot identify each other's transmissions, a conflict may occur because the channel sensing results are determined to be idle for each other. Meanwhile, if the start time is randomly adjusted by CP extension and / or puncturing for a single start symbol or multiple start symbols, some channels may be determined to be busy when performing channel sensing for each transmission. This may lead to a problem that FDM between different resources within the same RB set cannot be supported. Meanwhile, in the case of side link mode 2 resource (re)selection, the problem of overlapping transmission resources used for different transmissions is avoided or alleviated by the reserved resources indicated in the previous transmission.

[0255] For example, when performing sidelink transmission (e.g., PSCCH / PSSCH transmission and / or PSFCH transmission and / or S-SSB transmission), the UE can adjust the start position of the actual sidelink channel / signal transmission by extending the CP starting from the first symbol and / or puncturing one or more starting symbols, and the length of the CP extension and / or the length of the puncturing can be randomly selected from specific (pre)-configured candidates and / or predefined candidates. For example, random adjustment of the start position of the actual sidelink channel / signal transmission can be used only when the sidelink channel / signal uses all the frequency resources within the RB set, and / or the number of allocated RBs is greater than or equal to the (pre)-configured or predefined value, and / or the number of allocated RBs is greater than or equal to the (pre)-configured or predefined value relative to the total number of RBs within the RB set, and / or the sidelink channel / signal transmission is an initial transmission and / or there is no previous indication of resource reservation for the sidelink channel / signal. The fundamental reason for this is that in the case of an initial transmission, the sidelink resource reservation indication method may not be able to avoid conflicts between different transmissions.

[0256] For example, in the case of symbol puncturing, the presence or absence of puncturing and / or the possible length of the time interval may vary based on the subcarrier spacing (SCS) used for sidelink communication. For example, in the case of 15 kHz and / or 30 kHz SCS, puncturing of a part of the symbol time interval may be allowed, and in the case of 30 kHz and / or 60 kHz and / or 120 kHz, puncturing may not be allowed.

[0257] Meanwhile, in the case of sidelink communication on a shared spectrum, due to channel sensing failure, there may be a problem of increased delay time.

[0258] Figure 12 Illustrates the problem of increased delay time due to channel sensing failure. Figure 12 Embodiments of can be combined with various embodiments of the present disclosure.

[0259] Reference Figure 12 , a UE that has selected / reserved resources on slot #1 can perform LBT before performing SL transmission on the shared spectrum. If the UE fails the LBT, the UE may not be allowed to perform SL transmission using the resources selected / reserved on slot #1. In this case, since slots #2 to #7 are slots where SL communication is not allowed (e.g., slots that do not belong to the resource pool), LBT failure may cause serious delay in SL communication. In particular, if slots where SL communication is not allowed (e.g., slots that do not belong to the resource pool) are configured continuously, the above problem may become more serious.

[0260] Therefore, in order to mitigate the problem of increased latency due to channel sensing failure, different starting symbol positions or different starting time positions within a time slot may be allowed for sidelink communication, especially for PSCCH / PSSCH transmission.

[0261] Figure 13 Illustrates multiple starting symbol positions or multiple starting time positions within a time slot according to an embodiment of the present disclosure. Figure 13 Embodiments of may be combined with various embodiments of the present disclosure.

[0262] Reference Figure 13 , the starting symbol position within a time slot may be configured as symbol #A and symbol #B. In this case, for example, the UE may perform SL transmission using symbol #A to the last symbol within the time slot, or the UE may perform SL transmission using symbol #B to the last symbol within the time slot.

[0263] For example, if the UE sends PSCCH / PSSCH from an additionally allowed starting position, the PSCCH / PSSCH transmission signal may be sent in a delayed form depending on the starting position. For example, compared to when the transmission of PSCCH / PSSCH starts from the basic starting position, the transmission interval length of PSCCH / PSSCH may be reduced, and the latter half of the time domain of the PSCCH / PSSCH transmission signal may be punctured.

[0264] For example, in this case, in the case of PSCCH demodulation reference signal (DMRS) and / or PSSCH DMRS and / or CSI-RS sequence, a sequence generated based on the case where no transmission delay is performed and starting from the basic starting position (i.e., a sequence generated based on the symbol index to which RS is mapped in the above scenario) may be mapped to a symbol index that changes according to the transmission delay. For example, the symbol index where the actual RS is sent and the symbol index used to generate the RS sequence may be different.

[0265] For example, in this case, the PSCCH DMRS and / or PSSCH DMRS and / or CSI-RS sequence may be changed to a sequence generated based on the symbol index where the actual transmission occurs according to the transmission delay.

[0266] In embodiments of the present disclosure, it may be processed in different ways depending on the RS type. For example, PSCCH DMRS may use a sequence based on a reference before the transmission delay, while PSSCH DMRS may use a sequence changed based on a reference after the transmission delay.

[0267] For example, when the UE sends the PSCCH / PSSCH from an additionally allowed starting position, a part of the PSCCH / PSSCH transmission signal (the symbols before the starting position) may be punctured depending on the starting position. At the same time, due to the puncturing, the decoding of the first SCI and / or the second SCI may be impossible or inefficient, and in this case, even if the PSCCH / PSSCH is sent by changing the starting position, the receiving UE may not be able to correctly decode the PSCCH / PSSCH.

[0268] For example, the UE may repeatedly send the PSCCH starting from an additionally allowed starting position. For example, a set of symbols for repeatedly mapping the PSCCH may be determined such that it does not overlap with a specific PSSCH DMRS symbol candidate. For example, a specific PSSCH DMRS symbol candidate may include the DMRS symbols of all PSSCH DMRS patterns supported by NR SL. For example, a specific PSSCH DMRS symbol candidate may include the DMRS symbols of all PSSCH DMRS patterns configured in the resource pool for PSCCH / PSSCH transmission. For example, a symbol group of a specific PSSCH DMRS pattern may be excluded from the avoidance target. The specific PSSCH DMRS pattern may have 2 symbols, and in this case, puncturing for the PSCCH / PSSCH signal may not be allowed. For example, the number of symbols for PSCCH repetition may be the number of symbols (pre)configured for PSCCH transmission excluding the AGC symbol. For example, the number of symbols for PSCCH repetition may also include the AGC symbol in addition to the number of symbols (pre)configured for PSCCH transmission. For example, the number of symbols for PSCCH transmission may be significantly increased, and the position where the PSCCH / PSSCH is allowed to start may be (pre)configured within the PSCCH symbol duration. For example, the starting symbol position for the PSCCH may be changed to be in the middle of the symbol duration of the PSSCH. For example, in this case, the AGC symbol for the PSCCH / PSSCH may be in the form of replicating the first symbol of the PSSCH, or may be in the form of replicating the PSCCH / PSSCH symbol including the first symbol of the PSCCH. For example, the starting position of the PSCCH may be (pre)configured for each resource pool. For example, a symbol group to which the PSCCH with a changed starting position is mapped may be determined so as not to overlap with the PSSCH DMRS symbol candidate. Table 21 shows an example of the time domain position of the PSSCH DM-RS in NR SL.

[0269] [Table 21]

[0270]

[0271] According to Table 21, the position of the DM-RS symbol is given by l, where the number of PSSCH DM-RS is indicated in the SCI, and l d is the duration of the scheduling resource for transmitting the PSSCH and the associated PSCCH, including repeated OFDM symbols.

[0272] For example, the UE may start repeating the mapping of the second SCI from an additional allowed starting position. For example, when mapping the second SCI, the upper limit of the amount of resources to which the second SCI is mapped may be determined only before the next starting position. For example, the beta scaling value (e.g., beta_offset indicator) used to determine the number of REs to which the second SCI is mapped may be indicated by the first SCI for each repetition of the second SCI. For example, the UE may increase the number of REs of the second SCI, and the starting position of the PSCCH / PSSCH may be within the symbol duration to which the second SCI is mapped. For example, alternatively, the symbol duration to which the second SCI is mapped may be determined to include all or part of the candidate starting allowed positions for the PSCCH / PSSCH. For example, an increase in the number of REs mapped by the second SCI may imply an increase in the beta value of the second SCI mapping. Alternatively, for example, a scaling value may be multiplied additionally when deriving the number of REs mapped by the second SCI, and the scaling value may be separately (pre)-configured and / or indicated from the beta in the first SCI. For example, the position of the symbol at which the second SCI mapping starts may be changed to be later than the symbol immediately following the first PSSCH DMRS symbol. For example, the starting symbol position for the second SCI mapping may be determined after a specific symbol offset relative to the first symbol position of the PSCCH / PSSCH (including or not including AGC), or relative to the first symbol of the time slot, or relative to the first PSSCH DMRS transmission symbol (or the following symbol). For example, a specific symbol offset may be (pre)-configured and / or indicated in the first SCI. For example, the starting symbol position for the second SCI mapping may be changed to the next symbol of the second PSSCH transmission symbol. For example, the starting symbol position for the second SCI mapping may be changed to the latest symbol among the additional allowed starting positions for the PSCCH / PSSCH. For example, if the PSSCH DMRS is transmitted at the changed symbol position, the second SCI may be mapped from the next symbol of the DMRS symbol.

[0273] In embodiments of the present disclosure, the possibility of PSCCH / PSSCH transmission at an additional starting position may be applied differently depending on the PSSCH DMRS pattern or the number of DMRS symbols, and / or depending on the channel access type for sidelink transmission, and / or depending on the SL priority value, and / or depending on the CAPC. For example, if the number of remaining PSSCH DMRS symbols becomes zero or 1 due to a change in the starting position, a change in the starting position may not be allowed.

[0274] In embodiments of the present disclosure, the starting position of the actual sidelink channel / signal transmission may be adjusted according to the channel sensing result only when the sidelink channel / signal uses all frequency resources in the RB set and / or the number of allocated RBs is greater than or equal to a (pre)-configured value or a predefined value, and / or the number of allocated RBs is greater than or equal to a (pre)-configured value or a predefined value with respect to the total number of RBs in the RB set, and / or the sidelink channel / signal transmission is an initial transmission and / or no resource reservation for the sidelink channel / signal has been indicated previously and / or the sidelink channel / signal transmission is a retransmission.

[0275] Meanwhile, even in the case of transmitting a TB transmission via the PSSCH, if the number of CBs is large, the entire coded bits of a specific CB may be punctured due to a change in the starting position. In this case, if CBG-based transmission is not performed, the partial transmission through the change in the starting position may not be suitable in terms of TB decoding performance.

[0276] For example, the UE may first map the PSSCH to the time domain in the unlicensed band and then map it to the frequency domain. For example, when mapping the modulation symbols coded for the second SCI and / or TB, the UE may start from the subcarrier with the lowest index and perform RE mapping in ascending order of the lowest symbol index. After increasing the symbol index, the UE may perform RE mapping on the next subcarrier again in ascending order of the lowest symbol index. Then, the UE may repeat the above process. For example, the mapping of the PSCCH may be performed in the order of the symbol group index, the frequency domain index, and the symbol index within the symbol group. For example, different symbol durations may be specified as multiples based on the symbol at which the start of the PSCCH / PSSCH is allowed, and / or may be divided into time intervals capable of puncturing the PSCCH / PSSCH and other time intervals.

[0277] For example, the UE may divide each CB into two or more parts and perform mapping starting from different starting symbol indices. For example, different symbol durations may be specified as multiples based on the symbols that allow the PSCCH / PSSCH to start, and / or may be divided into time intervals capable of puncturing the PSCCH / PSSCH and other time intervals. For example, a part of the CB to be mapped to the puncturable part may correspond to parity bits.

[0278] For example, the UE may change differently the order of the CBs to be mapped starting from the starting symbol for each transmission. For example, the offset of the starting CB index to be mapped first above may be indicated in the first SCI and / or the second SCI, and / or may be determined based on the time slot index in which the PSCCH / PSSCH is sent.

[0279] For example, the UE may generate and map the PSCCH / PSSCH signal based on the latest symbol index among the symbol indices that allow the PSCCH / PSSCH to start, and the UE may copy and fill the partial symbols of the generated PSCCH / PSSCH into the remaining PSCCH / PSSCH resources. For example, the group of symbols to be copied may be selected from the first symbol of the generated PSCCH / PSSCH.

[0280] Meanwhile, the UE may expect to receive the PSFCH for the SL HARQ-ACK of the TB sent through the PSSCH after the PSCCH / PSSCH transmission, and the receiving UE may not be able to send the PSFCH depending on the channel sensing result.

[0281] For example, as part of a method to mitigate frequent PSFCH transmission failures, simplified channel sensing may be performed for PSFCH transmission. For example, the transmitting UE may perform PSCCH / PSSCH transmission with SL HARQ-ACK feedback enabled, such that the number of PSFCH transmissions within a specific time interval (e.g., 50 ms or a (pre)-configured value) is less than or equal to a specific level (e.g., 50 or a (pre)-configured value) and / or such that the sum of the transmission interval lengths of the PSFCH to be sent within a specific time interval (e.g., 50 ms or a (pre)-configured value) is less than and / or equal to a specific level (e.g., 2500 us or a (pre)-configured value). For example, scheduling restrictions may be performed for each receiving UE and / or each destination ID. For example, in this case, the receiving UE may perform simplified channel sensing (e.g., type 2A or type 2B or type 2C) for PSFCH transmission.

[0282] For example, if the number of PSFCH transmissions within a specific time interval (e.g., 50 ms or a (pre)-configured value) exceeds 50, and / or if the sum of the transmission interval lengths of the PSFCHs to be sent within a specific time interval (e.g., 50 ms or a (pre)-configured value) is greater than and / or equal to a specific level (e.g., 2500 us or a (pre)-configured value), then the PSCCH / PSSCH receiving UE may omit PSFCH transmission and / or perform channel sensing on subsequent PSFCH transmissions based on type 1 channel access (until the above conditions are met again). For example, when determining the above conditions, the PSFCHs sent by performing type 1 channel access may be excluded.

[0283] For example, as part of a method for alleviating the above-mentioned frequent PSFCH transmission failures, the number of PSFCH occasions or time slots associated with PSCCH / PSSCH may be two or more. For example, the PSCCH / PSSCH transmitting UE may indicate in the first SCI and / or the second SCI information regarding whether it is the earliest PSFCH or the next PSFCH, etc. after the minimum PSSCH to PSFCH timing. For example, in this case, if another UE determines to exclude the resources corresponding to PSCCH / PSSCH from the candidate resources during mode 2 resource (re)-selection, the UE may exclude the PSFCH resources indicated by PSCCH / PSSCH and / or all PSFCH resources that PSCCH / PSSCH can indicate from the PSFCH candidate resources. Additionally, based on this, the UE may select PSFCH resources from the PSFCH candidate set when indicated again during PSCCH / PSSCH transmission. For example, the association between PSCCH / PSSCH and PSFCH may exist for each of multiple timings. For example, the PSFCH resources set for a timing may be divided in terms of frequency and / or time (symbol index) and / or cyclic shift pair. For example, in this case, the PSCCH / PSSCH receiving UE may send SL HARQ-ACK feedback in the first associated PSFCH with successful channel sensing. For example, in this case, the PSCCH / PSSCH transmitting UE may attempt PSFCH detection for multiple PSFCH time slots, and if there is an ACK in the HARQ-ACK status determined for each PSFCH time slot, the PSCCH / PSSCH transmitting UE may determine the ACK for the TB sent through PSSCH.

[0284] Meanwhile, the UE may allow multiple starting symbols for PSCCH / PSSCH transmission. In such a case, the UE may prepare in advance the generation of PSCCH / PSSCH and related waveforms based on multiple starting symbols, and the UE may transmit PSCCH / PSSCH based on a specific starting symbol depending on the time determined to be idle according to the channel sensing result. For example, depending on the symbol where the start for PSCCH / PSSCH is allowed, all or part of the indication values indicated in the first SCI and / or the second SCI may be different. For example, in the case of the number of PSSCH DMRS symbols described above, different values may be indicated in the SCI for each symbol where the start is allowed. The reason for this is that when the starting symbols are different, the symbol duration length of the PSSCH may also be different, and thus, the number of DMRS symbols that can be supported may also be different. For example, in the case of the indicator for the second SCI format and / or the beta offset value indicator and / or the PSFCH overhead indicator used to adjust the number of REs to which the second SCI is mapped, different values may be indicated in the SCI for each symbol where the start is allowed. The reason for this is to adjust the ratio of the control information overhead as the symbol duration length of the PSSCH changes.

[0285] For example, in the case where multiple starting symbols are allowed, the UE can ensure the same transport block (TB) size for PSCCH / PSSCH transmission. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size based on the number of allocated REs derived according to the maximum PSSCH symbol duration length. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size based on the number of allocated REs derived according to the minimum PSSCH symbol duration length. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size according to the number of allocated REs derived based on the average PSSCH symbol duration length according to the allowed starting symbols. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size based on the number of allocated REs derived according to the (pre)-configured reference PSSCH symbol duration length for TBS calculation. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size based on the number of allocated REs derived according to the reference PSSCH symbol duration length indicated for TBS calculation in the first SCI. For example, if multiple PSCCH / PSSCH starting symbols are allowed, the UE can calculate the TB size based on the number of allocated REs derived according to the reference PSSCH symbol duration length indicated for TBS calculation in the second SCI. For example, when calculating the TB size, the PSSCH DMRS overhead and / or the number of REs to which the second SCI is mapped can be determined based on the PSSCH symbol duration length used in the TBS calculation. For example, when calculating the TB size, for the number of REs to which the second SCI is mapped and / or the PSSCH DMRS overhead, the maximum value among the values that can be derived according to the PSSCH symbol duration length and / or the PSCCH / PSSCH starting symbol index can be used. For example, when calculating the TB size, for the number of REs to which the second SCI is mapped and / or the PSSCH DMRS overhead, the minimum value among the values that can be derived according to the PSSCH symbol duration length and / or the PSCCH / PSSCH starting symbol index can be used. For example, when calculating the TB size, for the number of REs to which the second SCI is mapped and / or the PSSCH DMRS overhead, the average value of the values that can be derived according to the PSSCH symbol duration length and / or the PSCCH / PSSCH starting symbol index can be used.

[0286] For example, the UE may align all PSSCH symbol duration lengths to be the same for the same TB. For example, the UE may align all PSCCH / PSSCH start symbols to be the same for the same TB transmission. For example, regardless of the PSCCH / PSSCH start symbol, the PSSCH symbol duration length may always be the same.

[0287] For example, depending on the symbols allowed for starting PSCCH / PSSCH, the UE may keep all the indication values indicated by the first SCI and / or the second SCI the same. For example, in the case of the number of PSSCH DMRS symbols above, if the PSSCH symbol duration length does not support the number of DMRS symbols indicated according to the PSSCH start symbol, the UE may replace the actual PSSCH symbol duration length with the maximum number of DMRS symbols that the PSSCH symbol duration length can support among those less than the indicated number of DMRS symbols. For example, the maximum number of DMRS symbols that can be supported may be restricted to be selected from the (pre)-configured values in the resource pool. For example, depending on the symbols where starting is allowed, the upper limit of the number of REs to which the second SCI above is mapped may be determined based on the number of allocated REs derived from the maximum PSSCH symbol duration length and / or the minimum PSSCH symbol duration length and / or the average PSSCH symbol duration length. For example, in the case of the above PSFCH overhead indicator, if the PSFCH resource is not allowed in the PSSCH symbol duration length that changes according to the symbol where starting is allowed, even if the PSFCH overhead indicator is set to 1, the UE may ignore the PSFCH overhead indicator. In this case, the UE may not consider the PSFCH overhead when calculating the TB size and / or when calculating the REs to which the second SCI is mapped, and may omit the PSFCH overhead.

[0288] For example, the symbols allowed for starting PSCCH / PSSCH may be restricted according to the indication values indicated by the first SCI and / or the second SCI by the UE. For example, according to the number of PSSCH DMRS symbols indicated by the UE in the above SCI, when transmitting PSCCH / PSSCH, only the symbols allowed for starting corresponding to the PSSCH symbol duration that can support the indicated number of DMRS symbols may be considered / applied. For example, according to the PSFCH overhead value indicated by the UE in the above SCI, when transmitting PSCCH / PSSCH, only the symbols allowed for starting corresponding to the PSSCH symbol duration that can support the indicated PSFCH overhead value may be considered / applied.

[0289] In an embodiment of the present disclosure, the UE may perform different channel sensing on the starting symbols / positions for PSCCH / PSSCH in a time slot. For example, the UE may apply different energy detection thresholds to each starting symbol / position. For example, the UE may set the energy detection threshold for the second starting symbol / position to be lower than the energy detection threshold for the first starting symbol / position. The reason for doing this is to minimize the surrounding impact caused by using the second starting symbol / position. For example, the UE may set the energy detection threshold for the second starting symbol / position to be higher than the energy detection threshold for the first starting symbol / position. The reason for doing this is to increase the possibility of channel access at the second starting symbol / position after an LBT failure at the first starting symbol / position. For example, only when the PSSCH transmission is an initial transmission, can a channel access attempt be performed at the second starting symbol / position after an LBT failure at the first starting symbol / position. For example, only when the (re)transmission count for the PSSCH transmission is greater than or equal to a specific level (e.g., a (pre)configured value), can a channel access attempt be performed at the second starting symbol / position after an LBT failure at the first starting symbol / position. For example, if the SL priority value and / or the CAPC value is less than or equal to a (pre)configured threshold, a channel access attempt can be performed at the second starting symbol / position after an LBT failure at the first starting symbol / position. The reason for doing this is to provide more transmission opportunities for higher-priority transmissions. For example, if the SL priority value and / or the CAPC value is equal to or greater than a (pre)configured threshold, a channel access attempt can be performed at the second starting symbol / position after an LBT failure at the first starting symbol / position. For example, after an LBT failure at the first starting symbol / position based on the type 1 channel access procedure, a channel access attempt can be performed at the second starting symbol / position based on a series of type 2 channel access procedures. For example, in the case of a channel access attempt at the second starting symbol / position after an LBT failure at the first starting symbol / position based on the type 1 channel access procedure, the ongoing type 1 channel access procedure can be continuously performed. For example, after an LBT failure at the first starting symbol / position based on the type 2B channel access procedure, a channel access attempt can be performed at the second starting symbol / position based on the type 2A channel access procedure. For example, after an LBT failure at the first starting symbol / position based on the type 2A channel access procedure, a channel access attempt can be performed at the second starting symbol / position based on the type 2A channel access procedure. For example, in the case of a channel access attempt at the second starting symbol / position after an LBT failure at the first starting symbol / position based on the type 1 channel access procedure, the ongoing type 1 channel access procedure can be stopped, and a new type 1 channel access procedure can be performed again.

[0290] In embodiments of the present disclosure, various schemes may be applied differently depending on the CAPC value and / or depending on the SL priority value and / or depending on the (remaining) counter value of the type 1 channel access procedure and / or depending on the contention window size of the type 1 channel access procedure.

[0291] Meanwhile, as part of a method having multiple start symbols for PSCCH / PSSCH, multiple PSCCH / PSSCH resources in a time slot may be generated along the time domain. For example, by dividing 14 or 12 symbols in a time slot into 7 or 6, two PSCCH / PSSCH resources in the time slot can be ensured. Meanwhile, in the above structure, the PSSCH DMRS pattern may be limited to the case where the number of DMRS symbols is 2, and even this may be punctured by a part of the first DMRS due to PSCCH transmission. Additionally, in the above structure, a PSFCH resource cannot be allocated, and thus, an operation based on SL HARQ-ACK may not be performed.

[0292] For example, in the case of having multiple PSCCH / PSSCH time resources in a time slot, 1 PSSCH DMRS symbol may be allowed for each PSCCH / PSSCH resource. For example, the PSSCH DMRS symbol may be mapped after the last symbol to which the PSCCH is mapped. For example, the PSSCH DMRS symbol may be mapped to the last symbol to which the PSSCH is mapped. For example, among the symbols included in the time slot, the first half may be allocated as PSCCH / PSSCH resources, and the second half may be allocated as single or multiple PSFCH resources. For example, in the case of a method of mapping multiple PSFCH resources to half of the time slot, the PSFCH including two symbols may be continuously connected without a gap, and all or part of the last symbol may be a TX-RX switching symbol. For example, among the symbols included in the time slot, the first half may be allocated as single or multiple PSFCH resources, and the second half may be allocated as PSCCH / PSSCH resources. For example, the position of the PSFCH resource within the time slot may be (pre)-configured for each resource pool.

[0293] Meanwhile, after determining that the LBT fails, the UE may not have enough time to switch back to the SL reception operation during the duration of scheduling the SL transmission. For example, if the UE fails to perform LBT for the sidelink transmission resources, the UE may skip the sidelink reception operation in the time resources (e.g., time slots) of the transmission resources. For example, if the sidelink reception operation is skipped after the LBT fails, when the UE performs mode 2 resource (re)selection, the UE may regard the time slots in which no actual sidelink transmission is performed as non-monitoring time slots. For example, for the non-monitoring time slots within the sensing window, the UE may exclude from the available resources all the resources of the time slots within the resource selection window derived from the resource reservation period (pre)configured in the resource pool of the non-monitored time slots for each candidate. For example, if the UE fails to perform LBT for the sidelink transmission resources at the first starting position, the UE may skip the sidelink reception at the first starting position and / or attempt the sidelink reception at the second starting position. For example, if the UE fails to perform LBT for the sidelink transmission resources, the UE may skip the sidelink reception operation for some time intervals in the time resources (e.g., time slots) of the transmission resources, and the UE may perform the reception operation for the subsequent time intervals. For example, some time intervals may be limited within the CP length. For example, some time intervals may be limited to the first symbol available for the sidelink or PSCCH / PSSCH.

[0294] Meanwhile, for the transmission within a single RB set, the CP extension method may be different for the case where all the PRBs within the RB set are used for transmission and another case.

[0295] For example, if the UE performs transmission for all the PRBs within the RB set, the UE may determine the CP extension method and / or the CP extension length differently depending on the CAPC value or the SL priority value, and / or the UE may randomly select or determine the CP extension method and / or the CP extension length from the (pre)configured candidate CP extension length values according to the resource pool and / or inside or outside the COT and / or according to the CAPC or the SL priority.

[0296] For example, a candidate CPE start position (i.e., candidate CPE length value) for each priority of SL transmission (e.g., PSCCH / PSSCH transmission) can be (pre)-configured for the UE. For example, a candidate CPE start position (i.e., candidate CPE length value) for each priority of SL transmission (e.g., PSCCH / PSSCH transmission) can be (pre)-configured for the UE for each resource pool. In this case, for example, the UE can determine a candidate CPE start position related to the priority of the SL transmission among the candidate CPE start positions (pre)-configured for each priority of the SL transmission, and the UE can randomly select a candidate CPE start position among the candidate CPE start positions related to the priority of the SL transmission. Table 22 shows an example of a set of candidate CPE start positions (pre)-configured for each priority.

[0297] [Table 22]

[0298]

[0299] For example, referring to Table 22, a candidate CPE start position (i.e., candidate CPE length value) for each priority of SL transmission (e.g., PSCCH / PSSCH transmission) can be (pre)-configured. For example, if the UE intends to perform SL transmission with priority 3, the UE can randomly select a candidate CPE start position from the set of candidate CPE start positions {C1, C2,...}. For example, if the UE intends to perform SL transmission with priority 1, the UE can randomly select a candidate CPE start position from the set of candidate CPE start positions {A1, A2,...}. For example, the set of candidate CPE start positions can be a set of index values for CPE candidates.

[0300] In addition, for example, a candidate CPE start position (i.e., candidate CPE length value) that can be used for SL transmission within the COT and a candidate CPE start position that can be used for SL transmission outside the COT can be (pre)-configured for the UE individually. For example, a candidate CPE start position (i.e., candidate CPE length value) that can be used for SL transmission within the COT and a candidate CPE start position (i.e., candidate CPE length value) that can be used for SL transmission outside the COT can be (pre)-configured for the UE for each resource pool individually. In this case, for example, the UE can determine a candidate CPE start position related to the priority of the SL transmission among the candidate CPE start positions (pre)-configured for each priority of the SL transmission according to whether it is inside or outside the COT, and the UE can randomly select a candidate CPE start position among the candidate CPE start positions related to the SL transmission priority. Table 23 shows an example of a set of candidate CPE start positions (pre)-configured for each priority for inside or outside the COT.

[0301] [Table 23]

[0302]

[0303] For example, referring to Table 23, the candidate CPE start positions (i.e., the candidate CPE length values) can be (pre)-configured according to the priority for SL transmissions (e.g., PSCCH / PSSCH transmissions) inside or outside the COT. For example, if the UE intends to perform an SL transmission with priority 3 within the COT, the UE can randomly select a candidate CPE start position from the set of candidate CPE start positions {COT_IN_C1, COT_IN_C2, ...}. For example, if the UE intends to perform an SL transmission with priority 1 outside the COT, the UE can randomly select a candidate CPE start position from the set of candidate CPE start positions {COT_OUT_A1, COT_OUT - A2, ...}. For example, the set of candidate CPE start positions can be a set of index values for CPE candidates.

[0304] In the above embodiments, the indices for all candidate CPE values can be 0, 1, ..., M - 1, and the value of M and its candidate values can vary depending on the SCS.

[0305] For example, the set of CPE candidates pre-configured for the UE to use outside the COT can include at least one of the index value for the default CPE, the set of index values for CPE candidates for SL priority value 1, the set of index values for CPE candidates for SL priority value 2, the set of index values for CPE candidates for SL priority value 3, the set of index values for CPE candidates for SL priority value 4, the set of index values for CPE candidates for SL priority value 5, the set of index values for CPE candidates for SL priority value 6, the set of index values for CPE candidates for SL priority value 7, and / or the set of index values for CPE candidates for SL priority value 8. For example, for SL priority j, the CPE candidate values can be configured as 0, 1, 3, and for SL priority i, the CPE candidate numerical values can be configured as 3, 4, 5. For example, for SL priority j, the CPE candidate values can be configured as 0, 1, 4, and for SL priority i, the CPE candidate numerical values can be configured as 5, 6, 7. For example, for SL priority j, the CPE candidate values can be configured as 0, 1, 2, 3, 4, 5, 6, 7, and for SL priority i, the CPE candidate numerical values can be configured as 0, 1, 2, 3, 4, 5, 6, 7. For example, for SL priority j, the CPE candidate value can be configured as 0, and for SL priority i, the CPE candidate value can be configured as 1.

[0306] For example, the set of CPE candidates configured for the UE (pre-) for use within the COT may include at least one of the index value of the default CPE, the set of index values of CPE candidates for SL priority value 1, the set of index values of CPE candidates for SL priority value 2, the set of index values of CPE candidates for SL priority value 3, the set of index values of CPE candidates for SL priority value 4, the set of index values of CPE candidates for SL priority value 5, the set of index values of CPE candidates for SL priority value 6, the set of index values of CPE candidates for SL priority value 7, and / or the set of index values of CPE candidates for SL priority value 8.

[0307] For example, the set of CPE candidates configured for the UE (pre-) for use outside the COT may include the index value of the default CPE or a bitmap of size M (for the default CPE, the bitmap may (at most) only allow one value of 1), a bitmap of size M for SL priority value 1, a bitmap of size M for SL priority value 2, a bitmap of size M for SL priority value 3, a bitmap of size M for SL priority value 4, a bitmap of size M for SL priority value 5, a bitmap of size M for SL priority value 6, a bitmap of size M for SL priority value 7, and / or a bitmap of size M for SL priority value 8. For example, each entry of the bitmap may be sequentially associated with a candidate CPE value, and the candidate CPE values configured as 1 may be included in the set of candidate CPE values for the SL priority value.

[0308] For example, the set of CPE candidates configured for the UE (pre-) for use within the COT may include the index value of the default CPE or a bitmap of size M (for the default CPE, the bitmap may (at most) only allow one value of 1), a bitmap of size M for SL priority value 1, a bitmap of size M for SL priority value 2, a bitmap of size M for SL priority value 3, a bitmap of size M for SL priority value 4, a bitmap of size M for SL priority value 5, a bitmap of size M for SL priority value 6, a bitmap of size M for SL priority value 7, and / or a bitmap of size M for SL priority value 8. For example, each entry of the bitmap may be sequentially associated with a candidate CPE value, and the candidate CPE values configured as 1 may be included in the set of candidate CPE values for the SL priority value.

[0309] For example, if the UE performs transmissions on some PRBs within an RB set, the UE may use a (pre)-configured CP extension length according to the resource pool and / or inside or outside the COT and / or according to the CAPC or SL priority. At the same time, the UE may perform transmissions for multiple RB sets, and in such a case, it may be necessary to determine the method for performing CP extension. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be the CP extension method and length in the case where the UE uses all the PRBs in that RB set. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be the CP extension method and length in the case where the UE uses some of the PRBs in that RB set. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be the longer one among the CP extension methods and lengths derived by the UE in different ways. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be the shorter one among the CP extension methods and lengths derived by the UE in different ways. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be the average of the CP extension methods and lengths derived by the UE in different ways. For example, if the UE performs transmissions on resources in multiple RB sets, and / or if the UE uses all the PRBs in a specific RB set for transmission, and / or if the UE uses some of the PRBs in a specific RB set for transmission, the CP extension method and length used by the UE when performing transmissions on all allocated RB sets may be a value (pre)-configured by the UE alone.

[0310] For example, when the UE uses resources of multiple RB sets for transmission, the CP extension method and / or length can be determined and applied differently for each RB set.

[0311] In an embodiment of the present disclosure, the LBT failure may be limited to the failure caused by the channel access procedure of the type 2 series. In an embodiment of the present disclosure, the LBT failure may be limited to the case where the time interval between the time when the LBT failure is determined and the start time of the transmission resource or the time immediately before the transmission resource corresponding to the LBT is less than or equal to a specific level.

[0312] In an embodiment of the present disclosure, the puncturing of a specific symbol may be limited within the CP. In an embodiment of the present disclosure, the puncturing of a specific symbol may be restrictively applied to the duration other than the duration of performing the actual AGC. In an embodiment of the present disclosure, whether the CP is punctured in whole or in part and / or the length of the duration to be punctured may replace or extend whether or how to extend the CP. For example, whether the whole or part of the CP is punctured and / or the length of the duration to be punctured may be (pre)configured according to the resource pool and / or according to the SL channel and / or according to inside or outside the COT and / or according to the CAPC value and / or according to the SL priority value and / or according to the channel busy rate (CBR) range and / or according to the channel access type. For example, whether the whole or part of the CP is punctured and / or the length of the duration to be punctured may vary according to the resource pool and / or according to the SL channel and / or according to inside or outside the COT and / or according to the CAPC value and / or according to the SL priority value.

[0313] Table 24 shows an example of the SL received signal strength indicator (RSSI).

[0314] [Table 24]

[0315]

[0316] Table 25 shows an example of the SL channel busy rate (CBR).

[0317] [Table 25]

[0318]

[0319] Note 1: The slot index is based on the physical slot index.

[0320] For example, if the UE fails to perform LBT for the previous symbol start position, and / or if the UE fails to complete the LBT operation, and / or if the transmission of the previous symbol start position is discarded due to reasons such as the prioritization process and / or congestion control, etc., the UE may change the (next) symbol start position for the PSCCH / PSSCH.

[0321] In embodiments of the present disclosure, omitting all or part of the CP for sidelink transmission and / or reception may be applied in different ways depending on the target distance of sidelink communication. For example, if the target distance of sidelink communication is greater than or equal to a specific level, partial omission of the CP may not be allowed, and / or the interval length of CP omission may be configured differently (pre).

[0322] In various embodiments of the present disclosure, this method may be applied differently for each SL channel and / or depending on whether the PSCCH / PSSCH transmission by the UE is outside or inside the COT.

[0323] In various embodiments of the present disclosure, this method may be applied differently for each SCS and / or each RB set and / or each RB set size.

[0324] For example, configurations allowing multiple symbol starting positions for sidelink channels (PSCCH / PSSCH) and / or configurations adjusting the starting position through CPE or CP puncturing may be used simultaneously. For example, whether to apply CPE or CP puncturing may be different based on multiple symbol starting positions, and / or the length candidates for CPE or CP puncturing may be different. For example, even if CPE is applied for the first symbol starting position, the UE may not apply CPE when attempting to transmit for the next symbol starting position. For example, if the UE attempts LBT for the first or previous symbol starting position, and / or if the LBT result is busy, and / or if the UE switches to the receiving operation after canceling the transmission for the first or previous symbol starting position, and / or if the UE detects the SCI of another UE during the receiving operation, and / or if the PSSCH resource corresponding to the detected SCI overlaps with the transmission resource of the next symbol starting position of the UE, then the UE may not attempt to transmit for the next symbol starting position, and / or the UE may skip applying CPE when transmitting for the next symbol starting position. For example, based on multiple symbol starting positions for the PSCCH / PSSCH transmission of the UE, whether to apply CPE or CP puncturing and its length may be the same. For example, if the UE randomly selects the CPE length for the start of the previous symbol based on CAPC or SL priority, and if the UE attempts to transmit for the start of the next symbol, the UE may use the CPE length randomly selected based on CAPC or SL priority as it is.

[0325] For example, the UE may not expect to use configurations allowing multiple symbol starting positions for sidelink channels (PSCCH / PSSCH) and / or configurations adjusting the starting position through CPE or CP puncturing simultaneously.

[0326] Based on various embodiments of the present disclosure, candidate CPE length values (i.e., candidate CPE start positions) can be configured differently or independently according to the priority of SL transmission and / or according to whether it is inside or outside the COT. In this case, based on the priority of SL transmission and / or whether the SL transmission is performed inside or outside the COT, the UE can select one of the candidate CPE length values (i.e., candidate CPE start positions), and the UE can perform the corresponding CPE transmission. Therefore, efficient sidelink communication considering the priority of SL transmission and / or the COT duration in the unlicensed band can be supported.

[0327] Figure 14 A method for a first device to perform wireless communication according to an embodiment of the present disclosure is shown. Figure 14 Embodiments of can be combined with various embodiments of the present disclosure.

[0328] See Figure 14 , in step S1410, the first device may obtain information related to a plurality of candidate cyclic prefix extension (CPE) start positions. In step S1420, the first device may select a CPE start position among the plurality of candidate CPE start positions based on the priority of the sidelink (SL) transmission. In step S1430, the first device may perform the SL transmission based on the CPE start position.

[0329] For example, the first device may randomly select a CPE start position from at least one candidate CPE start position related to the priority of the SL transmission among the plurality of candidate CPE start positions.

[0330] For example, one or more candidate CPE start positions used within the channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT are configured separately.

[0331] For example, one or more candidate CPE start positions used within the channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT can be configured separately for each resource pool.

[0332] For example, multiple candidate CPE start positions may include one or more candidate CPE start positions used within the channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT. For example, based on the SL transmission being outside the COT, the CPE start position may be randomly selected by the first device from at least one candidate CPE start position related to the priority of the SL transmission among one or more candidate CPE start positions used outside the COT. For example, based on the SL transmission being within the COT, the CPE start position may be randomly selected by the first device from at least one candidate CPE start position related to the priority of the SL transmission among one or more candidate CPE start positions used within the COT.

[0333] For example, the SL transmission may include a physical side link control channel (PSCCH) transmission and a physical side link shared channel (PSSCH) transmission. For example, the PSCCH transmission may include a side link control information (SCI) transmission with priority.

[0334] For example, the SL transmission may be performed based on the success of listen-before-talk (LBT). For example, starting from the CPE start position, the first device may perform CPE in the time interval before the SL transmission. For example, the CPE may occur after the gap of the LBT. For example, the LBT is LBT based on random backoff or LBT during a preconfigured time interval.

[0335] The proposed method can be applied to devices based on various embodiments of the present disclosure. First, the processor 102 of the first device 100 may obtain information related to multiple candidate cyclic prefix extension (CPE) start positions. Additionally, the processor 102 of the first device 100 may select a CPE start position among the multiple candidate CPE start positions based on the priority of the side link (SL) transmission. Additionally, the processor 102 of the first device 100 may control the transceiver 106 to perform the SL transmission based on the CPE start position.

[0336] Based on an embodiment of the present disclosure, a first device adapted to perform wireless communication may be provided. For example, the first device may include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to perform operations including: obtaining information related to multiple candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the multiple candidate CPE start positions based on the priority of the side link (SL) transmission; and performing the SL transmission based on the CPE start position.

[0337] Embodiments based on the present disclosure may provide a processing device adapted to control a first device. For example, the processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to perform operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing SL transmission based on the CPE start position.

[0338] Embodiments based on the present disclosure may provide a non-transitory computer-readable storage medium storing instructions. For example, when executed, the instructions may cause the first device to perform operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing SL transmission based on the CPE start position.

[0339] Figure 15 A method for a second device to perform wireless communication according to embodiments based on the present disclosure is shown. Figure 15 Embodiments of may be combined with various embodiments of the present disclosure.

[0340] Reference Figure 15 , in step S1510, the second device may receive, from the first device, a first sidelink control information (SCI) and a second SCI for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH). In step S1520, the second SCI is received from the first device through the PSSCH. For example, a CPE start position is selected from a plurality of candidate cyclic prefix extension (CPE) start positions based on information related to the priority included in the first SCI.

[0341] The proposed method can be applied to devices according to various embodiments based on the present disclosure. First, the processor 202 of the second device 200 may control the transceiver 206 to receive, from the first device, a first sidelink control information (SCI) and a second SCI for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH). Additionally, the processor 202 of the second device 200 may control the transceiver 206 to receive the second SCI from the first device through the PSSCH. For example, a CPE start position is selected from a plurality of candidate cyclic prefix extension (CPE) start positions based on information related to the priority included in the first SCI.

[0342] Embodiments based on the present disclosure can provide a second device adapted to perform wireless communication. For example, the second device may include: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, based on being executed by the at least one processor, the instructions can cause the second device to perform operations including: receiving, from a first device, first side - link control information (SCI) and second SCI for scheduling a physical side - link shared channel (PSSCH) via a physical side - link control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH. For example, based on information related to the priority included in the first SCI, select a cyclic prefix extension (CPE) start position from a plurality of candidate CPE start positions.

[0343] Embodiments based on the present disclosure can provide a processing device adapted to control a second device. For example, the processing device may include: at least one processor; and at least one memory connected to the at least one processor and storing instructions. For example, based on being executed by the at least one processor, the instructions can cause the second device to perform operations including: receiving, from a first device, first side - link control information (SCI) and second SCI for scheduling a physical side - link shared channel (PSSCH) via a physical side - link control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH. For example, based on information related to the priority included in the first SCI, select a cyclic prefix extension (CPE) start position from a plurality of candidate CPE start positions.

[0344] Embodiments based on the present disclosure can provide a non - transitory computer - readable storage medium storing instructions. For example, when the instructions are executed, they can cause the second device to perform operations including: receiving, from a first device, first side - link control information (SCI) and second SCI for scheduling a physical side - link shared channel (PSSCH) via a physical side - link control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH. For example, based on information related to the priority included in the first SCI, select a cyclic prefix extension (CPE) start position from a plurality of candidate CPE start positions.

[0345] Various embodiments of the present disclosure can be combined with each other.

[0346] Hereinafter, devices to which various embodiments of the present disclosure can be applied will be described.

[0347] Various descriptions, functions, processes, proposals, methods, and / or operation flows of the present disclosure described herein can be applied to, but are not limited to, various fields that require wireless communication / connection (e.g., 5G) between devices.

[0348] In the following, a description will be given in more detail with reference to the accompanying drawings. In the following drawings / description, unless otherwise described, the same reference numerals may denote the same or corresponding hardware blocks, software blocks, or functional blocks.

[0349] Figure 16 A communication system 1 according to an embodiment of the present disclosure is shown. Figure 16 Embodiments of may be combined with various embodiments of the present disclosure.

[0350] Referring Figure 16 , 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, the wireless device represents a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, without limitation, a robot 100a, vehicles (100b-1, 100b-2), an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, the vehicle may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing vehicle-to-vehicle communication. Herein, the vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). The XR device may include an augmented reality (AR) / virtual reality (VR) / mixed reality (MR) device and may be implemented in the form of a head-mounted device (HMD), a head-up display (HUD) mounted in a vehicle, a TV, a smart phone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The handheld device may include a smart phone, a smart board, a wearable device (e.g., a smart watch or smart glasses), and a computer (e.g., a notebook). The home appliance may include a TV, a refrigerator, and a washing machine. The IoT device may include sensors and smart meters. For example, the BS and the network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node with respect to other wireless devices.

[0351] Here, in addition to LTE, NR, and 6G, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may also include Narrowband Internet of Things 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 technologies implemented in the wireless devices 100a to 100f of the present disclosure may perform communication based on the LTE-M technology. In this case, as an example, the LTE-M technology may be an example of an LPWAN and may be referred to by various names including enhanced machine type communication (eMTC), etc. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-bandwidth limited (non-BL), 5) LTE-MTC, 6) LTE machine type communication, and / or 7) LTE M, and is not limited to the above names. Additionally or alternatively, the wireless communication technologies implemented in the wireless devices 100a to 100f of the present disclosure may include at least one of Bluetooth, low-power wide-area network (LPWAN), and ZigBee considering low-power communication, 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 by various names.

[0352] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. AI technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without going through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). IoT devices (e.g., sensors) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0353] Wireless communication / connection 150a, 150b, or 150c can be established between wireless devices 100a to 100f / BS 200 or BS200 / BS 200. Here, the wireless communication / connection can be established via various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), or inter-BS communication (e.g., relay, integrated access and backhaul (IAB)). The wireless device and the BS / wireless device can send / receive radio signals to / from each other via wireless communication / connections 150a and 150b. For example, the wireless communication / connections 150a and 150b can send / receive signals via various physical channels. To this end, at least a part of the various configuration information configuration processes, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes for sending / receiving radio signals can be performed based on various proposals of the present disclosure.

[0354] Figure 17 A wireless device according to an embodiment of the present disclosure is shown. Figure 17 Embodiments of can be combined with various embodiments of the present disclosure.

[0355] Reference Figure 17 , the first wireless device 100 and the second wireless device 200 can send radio signals via various RATs (e.g., LTE and NR). Here, {the first wireless device 100 and the second wireless device 200} can correspond to Figure 16 {wireless device 100x and BS200} and / or {wireless device 100x and wireless device 100x} in.

[0356] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and may 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 send radio signals including the first information / signals through the (one or more) transceivers 106. The (one or more) processors 102 may receive radio signals including second information / signals through the transceivers 106, and then store the information obtained by processing the second information / signals in the (one or more) memories 104. The (one or more) memories 104 may be connected to the (one or more) processors 102, and may store various information related to the operation of the (one or more) processors 102. For example, the (one or more) memories 104 may store software codes including commands for executing part or all of the processing controlled by the (one or more) processors 102 or for executing the descriptions, functions, processes, proposals, methods, and / or operation flows disclosed in this document. Here, the (one or more) processors 102 and the (one or more) memories 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 106 may be connected to the (one or more) processors 102, and send and / or receive radio signals through the (one or more) antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The (one or more) transceivers 106 may be used interchangeably with the (one or more) radio frequency (RF) units. In this disclosure, the wireless device may represent a communication modem / circuit / chip.

[0357] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and may 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 procedures disclosed in this document. For example, the (one or more) processors 202 may process the information in the (one or more) memories 204 to generate third information / signals, and then transmit radio signals including the third information / signals through the (one or more) transceivers 206. The (one or more) processors 202 may receive radio signals including fourth information / signals through the (one or more) transceivers 106, and then store the information obtained by processing the fourth information / signals in the (one or more) memories 204. The (one or more) memories 204 may be connected to the (one or more) processors 202, and may store various information related to the operation of the (one or more) processors 202. For example, the (one or more) memories 204 may store software codes including commands for executing part or all of the processing controlled by the (one or more) processors 202 or for executing the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document. Here, the (one or more) processors 202 and the (one or more) memories 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The (one or more) transceivers 206 may be connected to the (one or more) processors 202, and transmit and / or receive radio signals through the (one or more) antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The (one or more) transceivers 206 may be used interchangeably with the (one or more) RF units. In the present disclosure, the wireless device may represent a communication modem / circuit / chip.

[0358] Next, the hardware components of wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by one or more processors 102 and 202, but are not limited to this. For example, one or more processors 102 and 202 may implement one or more layers (such as functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document. One or more processors 102 and 202 may generate signals (such as baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document, and provide the generated signals to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive signals (such as baseband signals) from one or more transceivers 106 and 206, and obtain PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document.

[0359] One or more processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. 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 processor 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, procedures, proposals, methods, and / or operation flows disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, procedures, or functions. The firmware or software configured to execute the descriptions, functions, procedures, proposals, methods, and / or operation 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, and thus be driven by one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and / or operation flows disclosed in this document may be implemented using software or firmware in the form of code, commands, and / or command sets.

[0360] One or more memories 104 and 204 may be connected to one or more processors 102 and 202, and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. One or more memories 104 and 204 may be constituted by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard drive, register, cache memory, computer-readable storage medium, and / or combinations thereof. One or more memories 104 and 204 may be located inside and / or outside one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 through various technologies such as wired or wireless connections.

[0361] One or more transceivers 106 and 206 may send user data, control information, and / or radio signals / channels mentioned in the methods and / or operation procedures of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may send and receive radio signals. For example, one or more processors 102 and 202 may execute control such that one or more transceivers 106 and 206 may send user data, control information, or radio signals to one or more other devices. One or more processors 102 and 202 may execute control such that one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information, and / or radio signals / channels mentioned in the descriptions, functions, processes, proposals, methods, and / or operation procedures disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert the received radio signals / channels, etc. from RF band signals to baseband signals to process the 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 the user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0362] Figure 18 A signal processing circuit for transmitting signals according to an embodiment of the present disclosure is shown. Figure 18 Embodiments of may be combined with various embodiments of the present disclosure.

[0363] Reference Figure 18 FIG., the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Operations / functions of may be performed Figure 18 without being limited to Figure 17processor(s) (102, 202) and / or transceiver(s) (106, 206). It can be implemented by Figure 17 processor(s) (102, 202) and / or transceiver(s) (106, 206) to achieve Figure 18 hardware elements. For example, block 1010 to 1060 can be implemented by Figure 17 processor(s) (102, 202). Alternatively, block 1010 to 1050 can be implemented by Figure 17 processor(s) (102, 202), and block 1060 can be implemented by Figure 17 transceiver(s) (106, 206).

[0364] It can convert the codeword into a radio signal via Figure 18 signal processing circuit 1000. Here, the codeword is a coded bit sequence of an information block. The information block can include transport blocks (e.g., UL-SCH transport block, DL-SCH transport block). The radio signal can be sent through various physical channels (e.g., PUSCH and PDSCH).

[0365] Specifically, the codeword can be converted by scrambler 1010 into a scrambled bit sequence. The scrambling sequence for scrambling can be generated based on an initial value, and the initial value can include the ID information of the wireless device. The scrambled bit sequence can be modulated by modulator 1020 into a modulated symbol sequence. The modulation scheme can include pi / 2-binary phase shift keying (pi / 2-BPSK), m-phase shift keying (m-PSK), and m-quadrature amplitude modulation (m-QAM). The complex modulated symbol sequence can be mapped by layer mapper 1030 to one or more transmission layers. The modulated symbols of each transmission layer can be mapped (precoded) by precoder 1040 to the corresponding antenna port(s). The output z of precoder 1040 can be obtained by multiplying the output y of layer mapper 1030 by the N*M precoding matrix W. Here, N is the number of antenna ports and M is the number of transmission layers. Precoder 1040 can perform precoding after performing transform precoding (e.g., DFT) for the complex modulated symbols. Alternatively, precoder 1040 can perform precoding without performing transform precoding.

[0366] The resource mapper 1050 may map the modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols in the time domain (e.g., CP-OFDMA symbols and DFT-s-OFDMA symbols) and a plurality of 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 transmitted 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 upconverter.

[0367] It is possible to configure the signal processing process for the signals received in the wireless device in a manner opposite to the Figure 18 signal processing processes (1010~1060). For example, a wireless device (e.g., Figure 17 100, 200) may receive a radio signal from the outside through an antenna port / transceiver. The received radio signal may 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 may be restored to a codeword through a resource demapping process, a post-coding process, a demodulation processor, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, the signal processing circuit (not illustrated) for receiving signals may include a signal restorer, a resource demapper, a post-encoder, a demodulator, a descrambler, and a decoder.

[0368] Figure 19 Another example of a wireless device based on an embodiment of the present disclosure is shown. The wireless device may be implemented in various forms according to use cases / services (refer to Figure 16 ). Figure 19 The embodiments of

[0369] may be combined with various embodiments of the present disclosure. Figure 19 Referring to Figure 17 , the wireless devices (100, 200) may correspond to the Figure 17 wireless devices (100, 200), and 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 additional components 140. The communication unit may include a communication circuit 112 and one or more transceivers 114. For example, the communication circuit 112 may include Figure 17One or more transceivers (106, 206) and / or one or more antennas (108, 208). The control unit 120 is electrically connected to the communication unit 110, the memory 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 operations of the wireless device based on programs / codes / commands / 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.

[0370] The additional components 140 can be configured in various ways according to the type of the wireless device. For example, the additional components 140 can include at least one of a power unit / battery, an input / output (I / O) unit, a driving unit, and a computing unit. The wireless device can be implemented in forms including but not limited to the following: a robot ( Figure 16 100a), a vehicle ( Figure 16 100b-1 and 100b-2), an XR device ( Figure 16 100c), a handheld device ( Figure 16 100d), a household appliance ( Figure 16 100e), an IoT device ( Figure 16 100f), a digital broadcast terminal, a holographic device, a public safety device, an MTC device, a medical device, a fintech device (or financial device), a security device, a climate / environment device, an AI server / device ( Figure 16 400), a BS ( Figure 16 200), a network node, etc. According to use cases / services, the wireless device can be used in mobile or fixed locations.

[0371] In Figure 19Among them, various components, units / parts, and / or modules in the wireless devices (100, 200) can all be connected to each other through a wired interface, or at least some of them can be wirelessly connected through the communication unit 110. For example, in each of the wireless devices (100, 200), the control unit 120 and the communication unit 110 can be connected by a wired connection, and the control unit 120 and the first units (e.g., 130, 140) can be wirelessly connected through the communication unit 110. Each component, unit / part, and / or module within the wireless devices (100, 200) can also include one or more elements. For example, the control unit 120 can be constructed by a set of one or more processors. As an example, the control unit 120 can be constructed by a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit, and a memory control processor. As another example, the memory 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.

[0372] Hereinafter, examples of implementing Figure 19 will be described in detail with reference to the accompanying drawings.

[0373] Figure 20 FIG. shows a handheld device based on an embodiment of the present disclosure. The handheld device can 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 can be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). Figure 20 Embodiments of

[0374] can be combined with various embodiments of the present disclosure. Figure 20 Referring to Figure 19 , the handheld device 100 can 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 can be configured as part of the communication unit 110. Blocks 110 to 130 / 140a to 140c respectively correspond to Figure 19 blocks 110 to 130 / 140 of

[0375] The communication unit 110 may send and receive signals (e.g., data signals and control signals) to and from other wireless devices or a BS. The control unit 120 may perform various operations by controlling the components 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 includes 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 for connecting to external devices (e.g., audio I / O ports and video I / O ports). 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 haptic module.

[0376] For example, in the case of data communication, the I / O unit 140c may acquire information / signals input by a user (e.g., touch, text, voice, image, or video), and the acquired information / signals may be stored in the storage unit 130. The communication unit 110 may convert the information / signals stored in the memory into a radio signal and directly send the converted radio signal to other wireless devices or to the BS. The communication unit 110 may receive a radio signal from other wireless devices or the BS and then restore the received radio signal to the original information / signals. The restored information / signals may be stored in the storage unit 130 and may be output through the I / O unit 140 in various types (e.g., text, voice, image, video, or haptic).

[0377] Figure 21 A vehicle or an autonomous vehicle according to an embodiment of the present disclosure is shown. The vehicle or the autonomous vehicle may be implemented by a mobile robot, an automobile, a train, a manned / unmanned aerial vehicle (AV), a ship, etc. Figure 21 Embodiments of may be combined with various embodiments of the present disclosure.

[0378] Reference Figure 21 , the vehicle or the autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d respectively correspond to Figure 19 blocks 110 / 130 / 140 of.

[0379] The communication unit 110 can send and receive signals (e.g., data signals and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 can perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 can include an electronic control unit (ECU). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to travel on the road. The driving unit 140a can include an engine, a motor, a transmission system, wheels, brakes, a steering device, etc. The power supply unit 140b can supply power to the vehicle or autonomous vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can acquire vehicle state, external environment information, user information, etc. The sensor unit 140c can include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d can implement technologies for keeping the lane in which the vehicle travels, for automatically adjusting the speed (e.g., adaptive cruise control), for autonomously driving along a determined path, for driving by automatically setting a path when a destination is set, etc.

[0380] For example, the communication unit 110 can receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d can generate an autonomous driving path and a driving plan from the acquired data. The control unit 120 can control the driving unit 140a so that the vehicle or autonomous vehicle 100 can move along the autonomous driving path according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit 110 can acquire the latest traffic information data from an external server non-periodically / periodically and acquire surrounding traffic information data from adjacent vehicles. During autonomous driving, the sensor unit 140c can acquire vehicle state and / or surrounding environment information. The autonomous driving unit 140d can update the autonomous driving path and the driving plan based on the newly acquired data / information. The communication unit 110 can transmit information about the vehicle position, the autonomous driving path, and / or the driving plan to an external server. The external server can use AI technology, etc. to predict traffic information data based on the information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0381] The claims in this specification can be combined in various ways. For example, the technical features in the method claims of this specification can be combined to be implemented or executed in a device, and the technical features in the device claims can be combined to be implemented or executed in a method. Additionally, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or executed in a device. Additionally, the technical features in (one or more) method claims and (one or more) device claims can be combined to be implemented or executed in a method.

Claims

1. A method for a first device to perform wireless communication, the method comprises: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

2. The method according to claim 1, wherein, the first device randomly selects the CPE start position from at least one candidate CPE start position related to the priority of the SL transmission among the plurality of candidate CPE start positions.

3. The method according to claim 1, wherein, one or more candidate CPE start positions used within a channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT are configured separately.

4. The method according to claim 1, wherein, one or more candidate CPE start positions used within a channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT are configured separately for each resource pool.

5. The method according to claim 1, wherein, the plurality of candidate CPE start positions includes one or more candidate CPE start positions used within a channel occupancy time (COT) and one or more candidate CPE start positions used outside the COT.

6. The method according to claim 5, wherein, based on the SL transmission being outside the COT, the first device randomly selects the CPE start position from at least one candidate CPE start position related to the priority of the SL transmission among the one or more candidate CPE start positions used outside the COT.

7. The method according to claim 5, wherein, based on the SL transmission being within the COT, the first device randomly selects the CPE start position from at least one candidate CPE start position related to the priority of the SL transmission among the one or more candidate CPE start positions used within the COT.

8. The method according to claim 1, wherein, the SL transmission includes physical sidelink control channel (PSCCH) transmission and physical sidelink shared channel (PSSCH) transmission.

9. The method according to claim 8, wherein, the PSCCH transmission includes sidelink control information (SCI) transmission including the priority.

10. The method according to claim 1, wherein, the SL transmission is performed based on the success of listen-before-talk (LBT).

11. The method according to claim 10, wherein, starting from the CPE start position, the first device performs CPE in a time interval before the SL transmission.

12. The method according to claim 10, wherein, CPE occurs after the gap of the LBT.

13. The method according to claim 10, wherein, the LBT is LBT based on random backoff or LBT during a preconfigured time interval.

14. A first device adapted to perform wireless communication, the first device comprises: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

15. A processing device adapted to control a first device, the processing device comprises: at least one processor; and at least one memory connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the first device to perform operations, the operations including: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

16. A non-transitory computer-readable storage medium storing instructions which, when executed, cause a first device to perform operations, the operations comprise: obtaining information related to a plurality of candidate cyclic prefix extension (CPE) start positions; selecting a CPE start position among the plurality of candidate CPE start positions based on the priority of sidelink (SL) transmission; and performing the SL transmission based on the CPE start position.

17. A method for a second device to perform wireless communication, the method comprises: receiving, via a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) and a second SCI for scheduling a physical sidelink shared channel (PSSCH) from a first device; and receiving, via the PSSCH, the second SCI from the first device, wherein a CPE start position is selected from a plurality of candidate cyclic prefix extension (CPE) start positions based on information related to the priority included in the first SCI.

18. A second device adapted to perform wireless communication, the second device comprises: at least one transceiver; at least one processor; and at least one memory connected to the at least one processor and storing instructions which, when executed by the at least one processor, cause the second device to perform operations, the operations including: receiving, via a physical sidelink control channel (PSCCH), a first sidelink control information (SCI) and a second SCI for scheduling a physical sidelink shared channel (PSSCH) from a first device; and receiving, via the PSSCH, the second SCI from the first device, Among them, a cyclic prefix extension (CPE) starting position is selected from multiple candidate CPE starting positions based on information related to the priority included in the first SCI.

19. A processing device adapted to control a second device, the processing device comprising: at least one processor; and at least one memory, the at least one memory being connected to the at least one processor and storing instructions, the instructions when executed by the at least one processor cause the second device to perform operations, the operations including: receiving, from a first device, first side - link control information (SCI) and second SCI for scheduling a physical side - link shared channel (PSSCH) via a physical side - link control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH, wherein, a cyclic prefix extension (CPE) starting position is selected from multiple candidate CPE starting positions based on information related to the priority included in the first SCI.

20. A non - transitory computer - readable storage medium storing instructions, the instructions when executed cause the second device to perform operations, the operations including: receiving, from a first device, first side - link control information (SCI) and second SCI for scheduling a physical side - link shared channel (PSSCH) via a physical side - link control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH, wherein, a cyclic prefix extension (CPE) starting position is selected from multiple candidate CPE starting positions based on information related to the priority included in the first SCI.

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