Method and apparatus for implementing CPE in unlicensed spectrum

Abstract

A method for a first device to perform wireless communication and a device supporting the method are provided, the method including the steps of: acquiring information related to a default cyclic prefix extension (CPE) starting position; acquiring information related to a plurality of CPE starting candidate positions; selecting a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and performing the SL transmission based on the selected CPE starting position.

Description

[Technical Field]

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

[0002] Sidelink (SL) is a communication method that establishes a direct link between terminals (User Equipment, UE) and directly exchanges voice or data between terminals without going through a base station (BS). SL is being considered as a solution to alleviate the burden on base stations due to the rapidly increasing data traffic. V2X (vehicle-to-everything) is a communication technology that exchanges information with other vehicles, pedestrians, infrastructure-based objects, etc. via wired or wireless communication. V2X can be divided into four types: V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), V2N (vehicle-to-network), and V2P (vehicle-to-pedestrian). V2X communication can be provided via the PC5 interface and / or Uu interface.

[0003] Meanwhile, as more and more communication devices require larger communication capacities, there is an emerging need for improved mobile broadband communication compared to existing radio access technologies (RATs). As a result, communication systems that take into account reliability- and latency-sensitive services or terminals are being discussed, and next-generation wireless access technologies that take into account improved mobile broadband communication, massive machine-type communication (MTC), ultra-reliable and low latency communication (URLLC), etc. can be called new radio access technology (RAT) or new radio (NR). Summary of the Invention [Means for solving the problem]

[0004] In one embodiment, a method for a first device to perform wireless communication is provided, which may include (comprise; configure; establish; configure; include; contain) the steps of: acquiring information related to a default cyclic prefix extension (CPE) starting position; acquiring information related to a plurality of CPE starting candidate positions; selecting a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and performing the SL transmission based on the selected CPE starting position.

[0005] In one embodiment, a first device configured to perform wireless communication is provided, the first device including at least one transceiver, at least one processor, and at least one memory coupled to the at least one processor and storing instructions, the instructions being executed by the at least one processor to cause the first device to: acquire information related to a default cyclic prefix extension (CPE) starting position; acquire information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position.

[0006] In one embodiment, a processing device configured to control a first device is provided, the processing device including at least one processor and at least one memory coupled to the at least one processor and storing instructions, the instructions being executed by the at least one processor to cause the first device to: obtain information related to a default cyclic prefix extension (CPE) starting position; obtain information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position.

[0007] In one embodiment, a non-transitory computer-readable storage medium is provided having instructions recorded thereon that, when executed, can cause a first device to: obtain information related to a default cyclic prefix extension (CPE) starting position; obtain information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position. [Brief explanation of the drawings]

[0008] [Figure 1]1 illustrates a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure. [Figure 2] 1 illustrates the electromagnetic spectrum, according to one embodiment of the present disclosure. [Figure 3] 1 illustrates the structure of an NR system according to one embodiment of the present disclosure. [Figure 4] 1 illustrates a radio protocol architecture according to one embodiment of the present disclosure. [Figure 5] 1 illustrates a structure of an NR radio frame according to one embodiment of the present disclosure. [Figure 6] 1 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. [Figure 7] 1 illustrates an example of a BWP according to an embodiment of the present disclosure. [Figure 8] According to one embodiment of the present disclosure, a procedure for a terminal to perform V2X or SL communication depending on a transmission mode is shown. [Figure 9] 1 illustrates three cast types according to one embodiment of the present disclosure. [Figure 10] 1 illustrates an interlaced RB according to one embodiment of the present disclosure. [Figure 11] 1 illustrates a method for a terminal to perform CPE according to one embodiment of the present disclosure. [Figure 12] 1 is a diagram illustrating problems that occur due to different CPEs. [Figure 13] 1 illustrates a method for a terminal to perform CPE according to one embodiment of the present disclosure. [Figure 14] This shows the problem of long delays due to channel sensing failure. [Figure 15] 1 illustrates the locations of multiple starting symbols or multiple starting times within a slot according to one embodiment of the present disclosure. [Figure 16] 1 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure. [Figure 17] 1 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure. [Figure 18] 1 illustrates a communication system 1 according to one embodiment of the present disclosure. [Figure 19] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 20] 1 illustrates a signal processing circuit for a transmit signal according to one embodiment of the present disclosure. [Figure 21] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 22] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 23] 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] As used herein, "A or B" can mean "only A," "only B," or "both A and B." Also, as used herein, "A or B" can be interpreted as "A and / or B." For example, as used herein, "A, B, or C" can mean "only A," "only B," "only C," or "any combination of A, B, and C."

[0010] As used herein, a slash ( / ) or a comma can mean "and / or." For example, "A / B" can mean "A and / or B." Therefore, "A / B" can mean "only A," "only B," or "both A and B." For example, "A, B, C" can mean "A, B, or C."

[0011] As used herein, "at least one of A and B" can mean "only A," "only B," or "both A and B." Additionally, as used herein, the expressions "at least one of A or B" and "at least one of A and / or B" can be interpreted as "at least one of A and B."

[0012] Furthermore, in this specification, "at least one of A, B, and C" can mean "only A," "only B," "only C," or "any combination of A, B, and C." Furthermore, "at least one of A, B, or C" or "at least one of A, B, and / or C" can mean "at least one of A, B, and C."

[0013] Furthermore, parentheses used herein may mean "for example." Specifically, when "control information (PDCCH)" is used, "PDCCH" is proposed as an example of "control information." Furthermore, "control information" in this specification is not limited to "PDCCH," and "PDCCH" is proposed as an example of "control information." Furthermore, when "control information (i.e., PDCCH)" is used, "PDCCH" is proposed as an example of "control information."

[0014] In the following description, "when, if, in case of" may be replaced with "based on."

[0015] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0016] In this specification, a higher layer parameter may be a parameter that is configured for a terminal, configured in advance, or predefined. For example, a base station or a network may transmit the higher layer parameter to the terminal. For example, the higher layer parameter may be transmitted via radio resource control (RRC) signaling or medium access control (MAC) signaling.

[0017] The following technologies 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), and single carrier frequency division multiple access (SC-FDMA). CDMA can be implemented in wireless technologies such as universal terrestrial radio access (UTRA) and CDMA2000. TDMA can be implemented in wireless technologies such as global system for mobile communications (GSM), general packet radio service (GPRS), and enhanced data rates for GSM evolution (EDGE). OFDMA can be implemented in wireless technologies such as IEEE (Institute of Electrical and Electronics Engineers) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3GPP (registered trademark) 3rd generation partnership project (LTE) long term evolution (LTE) employs OFDMA on the downlink and SC-FDMA on the uplink as part of evolved UMTS (E-UMTS) that uses evolved-UMTS terrestrial radio access (E-UTRA).LTE-A (advanced) is an evolution of 3GPP LTE.

[0018] 5G NR is a successor technology to LTE-A and is a new clean-slate mobile communication system with characteristics such as high performance, low latency, and high availability. 5G NR can utilize all available spectrum resources, including low-frequency bands below 1 GHz, intermediate-frequency bands between 1 GHz and 10 GHz, and high-frequency (millimeter wave) bands above 24 GHz.

[0019] The goals of the 6G (wireless communication) system include (i) extremely high data speeds per device, (ii) a very large number of connected devices, (iii) global connectivity, (iv) very low latency, (v) reduced energy consumption for battery-free IoT devices, (vi) ultra-reliable connections, and (vii) connected intelligence with machine learning capabilities. The vision of the 6G system is based on four aspects: intelligent connectivity, deep connectivity, holographic connectivity, and ubiquitous connectivity, and the 6G system can satisfy the requirements shown in Table 1 below. In other words, Table 1 is a table showing an example of the requirements for a 6G system.

[0020] [Table 1]

[0021] The 6G system has key elements such as eMBB (Enhanced mobile broadband), URLLC (Ultra-reliable low latency communications), mMTC (massive machine-type communication), AI integrated communication, tactile internet, high throughput, high network capacity, high energy efficiency, low backhaul and access network congestion, and enhanced data security.

[0022] 1 illustrates a communication structure that can be provided in a 6G system according to one embodiment of the present disclosure. The embodiment of FIG. 1 can be combined with various embodiments of the present disclosure.

[0023] 6G systems are expected to have 50 times higher simultaneous wireless communication connectivity than 5G wireless communication systems. URLLC, a key feature of 5G, could become a key technology in 6G communications by providing end-to-end delays of less than 1 ms. 6G systems have the potential to have much better volumetric spectral efficiency than the commonly used area spectral efficiency. 6G systems can offer advanced battery technology for extremely long battery life and energy harvesting, eliminating the need for separate charging for mobile devices in 6G systems. The new network characteristics of 6G are as follows:

[0024] - Satellite integrated network: 6G is expected to be integrated with satellites to provide a global mobile network. The integration of terrestrial, satellite and public networks into one wireless communication system is crucial for 6G.

[0025] -Connected intelligence: Unlike previous generations of wireless communication systems, 6G is revolutionary, evolving wirelessly from "connected things" to "connected intelligence." AI can be applied to each step of the communication process (or each step of signal processing, as described below).

[0026] Seamless integration of wireless information and energy transfer: 6G wireless networks will transmit power to charge the batteries of devices such as smartphones and sensors. Therefore, wireless information and energy transmission (WIET) can be integrated.

[0027] -Ubiquitous super 3D connectivity: Connecting drones and very low Earth orbit satellite networks to core network functions will create 6G ubiquitous super 3D connectivity.

[0028] Some common requirements for the characteristics of the new 6G network mentioned above are:

[0029] -Small cell networks: The idea of ​​small cell networks was introduced in cellular systems to improve the quality of received signals, resulting in increased throughput, energy efficiency, and spectral efficiency. As a result, small cell networks are an essential feature of 5G and beyond 5G (5G) communication systems. Therefore, 6G communication systems also adopt the features of small cell networks.

[0030] -Ultra-dense heterogeneous network: Ultra-dense heterogeneous networks are likely to become another key feature of 6G communication systems. Multi-layer networks composed of heterogeneous networks will improve overall QoS and reduce costs.

[0031] High-capacity backhaul: The backhaul connection is characterized as a high-capacity backhaul network to support large volumes of traffic. High-speed optical fiber and free-space optical communication (FSO) systems can be a possible solution to the problem.

[0032] - Radar technology integrated with mobile technology: High-precision localization (or location-based services) via communication is one of the functions of 6G wireless communication systems. Therefore, radar systems may be integrated with 6G networks.

[0033] Softwarization and virtualization: Softwarization and virtualization are two key features that underpin the design process for 5GB networks to ensure flexibility, reconfigurability and programmability, and the ability for billions of devices to share a shared physical infrastructure.

[0034] The core implementation technologies of the 6G system are explained below.

[0035] Artificial Intelligence: The most important and newly introduced technology for the 6G system is AI. 4G systems did not involve AI. 5G systems partially or very limitedly support AI. However, 6G systems will fully support AI for automation. Advances in machine learning will create a more intelligent network for real-time communication in 6G. Introducing AI into communications will simplify and improve real-time data transmission. AI can use numerous analyses to determine how complex target operations are executed. In other words, AI can increase efficiency and reduce processing delays. Time-consuming tasks such as handover, network selection, and resource scheduling can be performed instantly using AI. AI can also play an important role in M2M, machine-to-human, and human-to-machine communications. AI will also enable rapid communication in BCI (Brain-Computer Interface). AI-based communication systems are supported by metamaterials, intelligent structures, intelligent networks, intelligent devices, intelligent radios, self-sustaining wireless networks, and machine learning.

[0036] Terahertz Communication: Data transmission rates can be increased by increasing bandwidth. This can be achieved by using sub-THz communication over a wide bandwidth and applying advanced massively multiple input / output (MIMO) technology. Also known as submillimeter radiation, THz waves typically refer to the frequency band between 0.1 THz and 10 THz, with wavelengths ranging from 0.03 mm to 3 mm. The 100 GHz-300 GHz band range (sub-THz band) is considered the primary portion of the THz band for cellular communications. Adding the sub-THz band to the mmWave band will increase 6G cellular communication capacity. Of the defined THz bands, 300 GHz-3 THz is in the far-infrared (IR) frequency band. While the 300 GHz-3 THz band is part of a broadband, it is at the boundary of the broadband and immediately behind the RF band. Therefore, the 300 GHz-3 THz band is similar to RF. Figure 2 illustrates an electromagnetic spectrum according to one embodiment of the present disclosure. The example of Figure 2 can be combined with various embodiments of the present disclosure. Key characteristics of THz communications include (i) a wide usable bandwidth to support very high data rates, and (ii) high path loss at high frequencies (highly directional antennas are essential). The narrow beamwidth produced by highly directional antennas reduces interference. The small wavelength of THz signals allows a greater number of antenna elements to be integrated into devices and base stations operating in this band. This allows for the use of advanced adaptive array techniques that can overcome range limitations.

[0037] -Large-scale MIMO technology

[0038] -Hologram beam forming (HBF)

[0039] -Optical wireless technology

[0040] -Free Space Optical Transmission Backhaul Network (FSO Backhaul Network)

[0041] -Non-Terrestrial Networks (NTN)

[0042] -Quantum Communication

[0043] -Cell-free Communication

[0044] -Integration of Wireless Information and Power Transmission

[0045] -Integration of Wireless Communication and Sensing

[0046] -Integrated Access and Backhaul Network

[0047] -Big data analysis

[0048] -Reconfigurable Intelligent Surface

[0049] -Metaverse

[0050] -Blockchain

[0051] Unmanned Aerial Vehicles (UAVs): UAVs (Unmanned Aerial Vehicles), or drones, have the potential to become a key element in 6G wireless communications. In most cases, high-speed data wireless connections are provided using UAV technology. BS entities are installed on UAVs to provide cellular connectivity. UAVs possess certain features not found in fixed BS infrastructure, such as easy deployment, strong line-of-sight links, and freedom of controlled mobility. During emergency situations such as natural disasters, deploying terrestrial communication infrastructure is economically unfeasible and sometimes unable to provide services in volatile environments. UAVs can easily handle such situations. UAVs have the potential to become a new paradigm in the field of wireless communications. This technology facilitates the three fundamental requirements of wireless networks: eMBB, URLLC, and mMTC. UAVs can also support various purposes such as improved network connectivity, fire detection, disaster emergency services, security and surveillance, pollution monitoring, parking monitoring, and accident monitoring. Therefore, UAV technology is recognized as one of the most important technologies for 6G communications.

[0052] -Autonomous Driving (Self-driving): Perfect autonomous driving requires vehicle-to-vehicle communication to notify each other of dangerous situations, or vehicle-to-vehicle communication with infrastructure such as parking lots and traffic lights to confirm information such as parking location and traffic light change times. V2X (Vehicle-to-Everything), a key element in building autonomous driving infrastructure, is a technology that allows vehicles to communicate and share information with various elements on the road for autonomous driving, including wireless communication between vehicles (V2V, Vehicle-to-Vehicle) and between vehicles and infrastructure (V2I, Vehicle-to-Infrastructure). High-speed transmission and low-latency technology are essential to maximize autonomous driving performance and ensure high safety. Furthermore, autonomous driving will go beyond simply providing warnings and guidance messages to drivers and actively intervene in vehicle operation, directly controlling the vehicle in dangerous situations. This will require a huge amount of information to be transmitted and received, and 6G is expected to maximize autonomous driving with faster transmission speeds and lower latency than 5G.

[0053] For clarity of explanation, the description focuses on 5G NR, but the technical idea according to an embodiment of the present disclosure is not limited thereto, and various embodiments of the present disclosure may also be applied to 6G communication systems.

[0054] 3 illustrates an NR system architecture according to one embodiment of the present disclosure. The embodiment of FIG. 3 can be combined with various embodiments of the present disclosure.

[0055] Referring to FIG. 3, a Next Generation Radio Access Network (NG-RAN) may include a base station 20 that provides user plane and control plane protocol termination for a terminal 10. For example, the base station 20 may include a next generation NodeB (gNB) and / or an evolved NodeB (eNB). For example, the terminal 10 may be fixed or mobile, and may be referred to as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device, or other terms. For example, a base station is a fixed station that communicates with the terminal 10, and may be referred to as a base transceiver system (BTS), an access point, or other terms.

[0056] The embodiment of Figure 3 illustrates a case where only gNBs are included. Base stations 20 may be connected to each other via an Xn interface. Base stations 20 may be connected to a 5G Core Network (5GC) via an NG interface. More specifically, base stations 20 may be connected to an access and mobility management function (AMF) 30 via an NG-C interface and to a user plane function (UPF) 30 via an NG-U interface.

[0057] The radio interface protocol layers between a terminal and a network can be divided into L1 (Layer 1), L2 (Layer 2), and L3 (Layer 3) based on the three lower layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. Among these, the physical layer, which belongs to Layer 1, provides information transfer services using physical channels, and the Radio Resource Control (RRC) layer, which is located in Layer 3, controls radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the terminal and the base station.

[0058] Figure 4 illustrates a radio protocol architecture according to one embodiment of the present disclosure. The embodiment of Figure 4 can be combined with various embodiments of the present disclosure. Specifically, Figure 4(a) illustrates a user plane radio protocol stack for Uu communications, and Figure 4(b) illustrates a control plane radio protocol stack for Uu communications. Figure 4(c) illustrates a user plane radio protocol stack for SL communications, and Figure 4(d) illustrates a control plane radio protocol stack for SL communications.

[0059] Referring to Figure 4, the physical layer provides information transfer services to higher layers using physical channels. The physical layer is connected to the higher layer, the Medium Access Control (MAC) layer, via transport channels. Data moves between the MAC layer and the physical layer via the transport channels. Transport channels are classified according to how and what characteristics data is transmitted over the radio interface.

[0060] Data is transferred between different physical layers, i.e., between the physical layers of a transmitter and a receiver, via a physical channel, which can be modulated using Orthogonal Frequency Division Multiplexing (OFDM) and utilizes time and frequency as radio resources.

[0061] The MAC layer provides services to the higher-level radio link control (RLC) layer via logical channels. The MAC layer provides a mapping function from multiple logical channels to multiple transport channels. The MAC layer also provides a logical channel multiplexing function by mapping multiple logical channels to a single transport channel. The MAC sublayer provides data transfer services on the logical channels.

[0062] The RLC layer performs concatenation, segmentation, and reassembly of RLC Service Data Units (SDUs). To guarantee various Quality of Service (QoS) requirements for Radio Bearers (RBs), the RLC layer provides three operation modes: Transparent Mode (TM), Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provides error correction via automatic repeat request (ARQ).

[0063] The Radio Resource Control (RRC) layer is defined only in the control plane. The RRC layer is responsible for controlling logical channels, transmission channels, and physical channels in relation to the configuration, reconfiguration, and release of radio bearers. RB refers to the logical path provided by layer 1 (physical layer or PHY layer) and layer 2 (MAC layer, RLC layer, PDCP (Packet Data Convergence Protocol) layer, SDAP (Service Data Adaptation Protocol) layer) for data transmission between the terminal and the network.

[0064] The functions of the PDCP layer in the user plane include user data transmission, header compression, and ciphering, and the functions of the PDCP layer in the control plane include control plane data transmission and encryption / integrity protection.

[0065] The Service Data Adaptation Protocol (SDAP) layer is defined only in the user plane. The SDAP layer performs mapping between QoS flows and data radio bearers, QoS flow identifier (ID) marking in downlink and uplink packets, etc.

[0066] RB configuration refers to the process of defining the characteristics of the radio protocol layer and channel to provide a specific service and setting their specific parameters and operation methods. RBs are divided into two types: SRB (Signaling Radio Bearer) and DRB (Data Radio Bearer). SRB is used as a path to transmit RRC messages in the control plane, and DRB is used as a path to transmit user data in the user plane.

[0067] When an RRC connection is established between the RRC layer of the terminal and the RRC layer of the base station, the terminal is in an RRC_CONNECTED state; otherwise, it is in an RRC_IDLE state. In the case of NR, an RRC_INACTIVE state is additionally defined, and a terminal in the RRC_INACTIVE state maintains a connection with the core network and can release the connection with the base station.

[0068] Downlink transport channels for transmitting data from a network to a terminal include a Broadcast Channel (BCH) for transmitting system information and a Downlink Shared Channel (SCH) for transmitting user traffic and control messages. Traffic or control messages of a downlink multicast or broadcast service can be transmitted via the Downlink SCH or via a separate Multicast Channel (MCH). Meanwhile, uplink transport channels for transmitting data from a terminal to a network include a Random Access Channel (RACH) for transmitting initial control messages and an Uplink Shared Channel (SCH) for transmitting user traffic and control messages.

[0069] Above the transport channels, logical channels that are mapped to the transport channels include BCCH (Broadcast Control Channel), PCCH (Paging Control Channel), CCCH (Common Control Channel), MCCH (Multicast Control Channel), and MTCH (Multicast Traffic Channel).

[0070] 5 illustrates a radio frame structure for NR according to one embodiment of the present disclosure. The embodiment of FIG. 5 can be combined with various embodiments of the present disclosure.

[0071] Referring to Figure 5, in NR, radio frames can be used for uplink and downlink transmission. A radio frame has a length of 10 ms and can be defined as two 5 ms half-frames (HF). A half-frame can include five 1 ms subframes (SF). A subframe can be divided into one or more slots, and the number of slots in a subframe can be determined by the subcarrier spacing (SCS). Each slot can include 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP).

[0072] When a normal CP is used, each slot can contain 14 symbols. When an extended CP is used, each slot can contain 12 symbols. Here, the symbols can include OFDM symbols (or CP-OFDM symbols) or Single Carrier-FDMA (SC-FDMA) symbols (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbols).

[0073] Table 2 below shows the number of symbols per slot (N) depending on the SCS setting (u) when a normal CP or an extended CP is used. slot symb ), number of slots per frame (N frame,u slot ) and the number of slots per subframe (N subframe,u slot ) is shown below.

[0074] [Table 2]

[0075] In an NR system, OFDM(A) numerology (e.g., SCS, CP length, etc.) can be set to be different between multiple cells merged into one terminal, thereby allowing the (absolute time) duration of time resources (e.g., subframes, slots, or TTIs) (commonly referred to as TUs (Time Units) for convenience) consisting of the same number of symbols to be set to be different between the merged cells.

[0076] In NR, multiple numerologies or SCSs can be supported to support various 5G services. For example, if the SCS is 15 kHz, wide areas in traditional cellular bands can be supported, and if the SCS is 30 kHz / 60 kHz, dense-urban areas, lower latency, and wider carrier bandwidths can be supported. If the SCS is 60 kHz or higher, bandwidths greater than 24.25 GHz can be supported to overcome phase noise.

[0077] The NR frequency band can be defined as two types of frequency ranges. The two types of frequency ranges are FR1 and FR2. The values ​​of the frequency ranges can be changed. For example, the two types of frequency ranges are shown in Table 3 below. Among the frequency ranges used in the NR system, FR1 can mean the "sub 6 GHz range" and FR2 can mean the "above 6 GHz range" and can be called millimeter wave (mmW).

[0078] [Table 3]

[0079] As mentioned above, the numerical values ​​of the frequency range of the NR system may be changed. For example, FR1 may include the band from 410 MHz to 7125 MHz as shown in Table 4 below. That is, FR1 may include frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.). For example, the frequency bands above 6 GHz (or 5850, 5900, 5925 MHz, etc.) included in FR1 may include unlicensed bands. Unlicensed bands may be used for various purposes, such as communications for vehicles (e.g., autonomous driving).

[0080] [Table 4]

[0081] 6 illustrates a slot structure of an NR frame according to one embodiment of the present disclosure. The embodiment of FIG. 6 can be combined with various embodiments of the present disclosure.

[0082] 6, a slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot may include 14 symbols, and in the case of an extended CP, one slot may include 12 symbols. Alternatively, in the case of a normal CP, one slot may include 7 symbols, and in the case of an extended CP, one slot may include 6 symbols.

[0083] A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) can be defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) can be defined as multiple (P)RBs (Physical Resource Blocks) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier can include up to N (e.g., 5) BWPs. Data communication can be performed via activated BWPs. Each element is called a resource element (RE) in the resource grid, and one complex symbol can be mapped to it.

[0084] Below, we will explain about BWP (Bandwidth Part) and carrier.

[0085] A Bandwidth Part (BWP) is a contiguous set of physical resource blocks (PRBs) in a given numerology. PRBs can be selected from a contiguous subset of common resource blocks (CRBs) for a given numerology on a given carrier.

[0086] For example, the BWP may be at least one of an active BWP, an initial BWP, and / or a default BWP. For example, the UE may not monitor 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 PDCCH, a physical downlink shared channel (PDSCH), or a CSI-RS (reference signal) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a CSI (Channel State Information) report for an inactive DL BWP. For example, the UE may not transmit a PUCCH (physical uplink control channel) or a PUSCH (physical uplink shared channel) outside the active UL BWP. For example, in the downlink, the initial BWP is given as a contiguous RB set for the remaining minimum system information (RMSI) control resource set (CORESET) (set by the physical broadcast channel (PBCH)). For example, in the uplink, the initial BWP is provided by a system information block (SIB) for the random access procedure. For example, the default BWP is configured by a higher layer. For example, the initial value of the default BWP is the initial DL BWP. To save energy, when the terminal cannot detect DCI for a certain period of time, the terminal can switch the active BWP of the terminal to the default BWP.

[0087] Meanwhile, a BWP can be defined for SL. The same SL BWP can be used for transmission and reception. For example, a transmitting terminal can transmit an SL channel or an SL signal on a specific BWP, and a receiving terminal can receive an SL channel or an SL signal on the specific BWP. In a licensed carrier, an SL BWP can be defined separately from a Uu BWP, and the SL BWP can have separate configuration signaling from the Uu BWP. For example, a terminal can receive a configuration for the SL BWP from a base station / network. For example, a terminal can receive a configuration for the Uu BWP from a base station / network. An SL BWP can be configured (pre-configured) for out-of-coverage NR V2X terminals and RRC_IDLE terminals within a carrier. For a terminal in RRC_CONNECTED mode, at least one SL BWP can be activated within the carrier.

[0088] 7 illustrates an example of a BWP according to an embodiment of the present disclosure. The embodiment of FIG. 7 can be combined with various embodiments of the present disclosure. In the embodiment of FIG. 7, it is assumed that there are three BWPs.

[0089] Referring to Figure 7, CRBs (common resource blocks) are carrier resource blocks numbered from one end of a carrier band to the other end, and PRBs are resource blocks numbered within each BWP. Point A can indicate a common reference point for the resource block grid.

[0090] BWP is point A, offset from point A (N start BWP ) and bandwidth (N size BWP) For example, point A is the external reference point of the PRB of the carrier to which subcarrier 0 of all numerologies (e.g., all numerologies supported by the network on the carrier) is aligned. For example, the offset is the PRB spacing between the lowest subcarrier in a given numerology and point A. For example, the bandwidth is the number of PRBs in a given numerology.

[0091] Below, we will explain V2X or SL communication.

[0092] The Sidelink Synchronization Signal (SLSS) is a SL-specific sequence and may include a Primary Sidelink Synchronization Signal (PSSS) and a Secondary Sidelink Synchronization Signal (SSSS). The PSSS may be referred to as a Sidelink Primary Synchronization Signal (S-PSS), and the SSSS may be referred to as a Sidelink Secondary Synchronization Signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 Gold sequences may be used for the S-SSS. For example, a terminal may perform initial signal detection and acquire synchronization using the S-PSS. For example, a terminal may acquire detailed synchronization and detect a synchronization signal ID using the S-PSS and S-SSS.

[0093] The PSBCH (Physical Sidelink Broadcast Channel) is a (broadcast) channel that transmits basic (system) information that a terminal must know first before transmitting or receiving an SL signal. For example, the basic information includes information related to SLSS, duplex mode (DM), TDDUL / DL (Time Division Duplex Uplink / Downlink) configuration, resource pool-related information, type of application related to SLSS, subframe offset, broadcast information, etc. For example, for evaluating PSBCH performance, in NR V2X, the size of the PSBCH payload is 56 bits, including a 24-bit CRC (Cyclic Redundancy Check).

[0094] The S-PSS, S-SSS, and PSBCH can be included in a block format (e.g., an S-SS (Synchronization Signal) / PSBCH block, hereinafter referred to as an S-SSB (Sidelink-Synchronization Signal Block)) that supports periodic transmission. The S-SSB can have the same numerology (i.e., SCS and CP length) as the PSCCH (Physical Sidelink Control Channel) / PSSCH (Physical Sidelink Shared Channel) in a carrier, and the transmission bandwidth is within a (pre-) configured S-BWP (Sidelink Bandwidth Part). For example, the bandwidth of the S-SSB is 11 RBs (Resource Blocks). For example, the PSBCH spans 11 RBs. The frequency location of the S-SSB can be (pre-) configured. Therefore, the terminal does not need to perform hypothesis detection in frequency to find the S-SSB in the carrier.

[0095] 8 illustrates a procedure in which a terminal performs V2X or SL communication according to a transmission mode according to an embodiment of the present disclosure. The embodiment of FIG. 8 can 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 convenience of description, in LTE, the transmission mode may be referred to as an LTE transmission mode, and in NR, the transmission mode may be referred to as an NR resource allocation mode.

[0096] For example, (a) of Figure 8 illustrates terminal operation associated with LTE transmission mode 1 or LTE transmission mode 3. Alternatively, for example, (a) of Figure 8 illustrates terminal operation associated with NR resource allocation mode 1. For example, LTE transmission mode 1 may be applied to general SL communication, and LTE transmission mode 3 may be applied to V2X communication.

[0097] For example, (b) of FIG. 8 illustrates terminal operation associated with LTE transmission mode 2 or LTE transmission mode 4. Or, for example, (b) of FIG. 8 illustrates terminal operation associated with NR resource allocation mode 2.

[0098] 8(a), in LTE transmission mode 1, LTE transmission mode 3, or NR resource allocation mode 1, a base station may schedule SL resources to be used by a terminal for SL transmission. For example, in step S800, the base station may transmit information related to SL resources and / or information related to UL resources to a first terminal. For example, the UL resources may include PUCCH resources and / or PUSCH resources. For example, the UL resources may be resources for reporting SL HARQ feedback to the base station.

[0099] For example, the first terminal may 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 may include CG type 1 resources or CG type 2 resources. In this specification, the DG resources may be resources configured / assigned to the first terminal by the base station via downlink control information (DCI). In this specification, the CG resources may be (periodic) resources configured / assigned to the first terminal by the base station via DCI and / or an RRC message. For example, in the case of CG type 1 resources, the base station may send an RRC message including information related to the CG resources to the first terminal. For example, in the case of CG type 2 resources, the base station may send an RRC message including information related to the CG resources to the first terminal, and the base station may send a DCI related to the activation or release of the CG resources to the first terminal.

[0100] In step S810, the first terminal may transmit a PSCCH (e.g., Sidelink Control Information (SCI) or 1st-stage SCI) to a second terminal based on the resource scheduling. In step S820, the first terminal may transmit a PSSCH (e.g., 2nd-stage SCI, MAC PDU, data, etc.) associated with the PSCCH to a second terminal. In step S830, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from a second terminal. For example, HARQ feedback information (e.g., NACK information or ACK information) may be received from the second terminal via the PSFCH. In step S840, the first terminal may transmit / report HARQ feedback information to a base station via a PUCCH or a PUSCH. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on the HARQ feedback information received from the second terminal. For example, the HARQ feedback information reported to the base station may be information generated by the first terminal based on a preset rule. 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.

[0101] Referring to (b) of FIG. 8, in LTE transmission mode 2, LTE transmission mode 4, or NR resource allocation mode 2, the terminal can determine SL transmission resources within SL resources configured by the base station / network or pre-configured SL resources. For example, the configured SL resources or pre-configured SL resources may be a resource pool. For example, the terminal can autonomously select or schedule resources for SL transmission. For example, the terminal can self-select resources within a configured resource pool to perform SL communication. For example, the terminal can perform sensing and resource (re)selection procedures and self-select resources within a selection window. For example, the sensing can be performed in units of subchannels. For example, in step S810, the first terminal that self-selected resources within the resource pool may use the resources to transmit PSCCH (e.g., SCI (Sidelink Control Information) or 1 st In step S820, the first terminal transmits a PSSCH (e.g., a 2-stage SCI) associated with the PSCCH to the second terminal. nd In step S830, the first terminal may receive a PSFCH associated with the PSCCH / PSSCH from the second terminal.

[0102] Referring to (a) or (b) of FIG. 8, for example, the first terminal can transmit an SCI to the second terminal on the PSCCH. Alternatively, for example, the first terminal can transmit two consecutive SCIs (e.g., 2-stage SCIs) to the second terminal on the PSCCH and / or PSSCH. In this case, the second terminal can decode the two consecutive SCIs (e.g., 2-stage SCIs) to receive the PSSCH from the first terminal. In this specification, the SCI transmitted on the PSCCH is referred to as a 1 st SCI, 1st SCI, 1 st -stage SCI or 1 st The SCI transmitted on the PSSCH can be referred to as a 2-stage SCI format. nd SCI, 2nd SCI, 2nd -stage SCI or 2 nd -stage SCI format. For example, st -stage SCI formats can include SCI format 1-A, 2 nd -stage SCI formats may include SCI format 2-A and / or SCI format 2-B.

[0103] An example of SCI format 1-A will be described below.

[0104] SCI format 1-A is for PSSCH and 2 on PSSCH. nd Used for scheduling -stage SCI.

[0105] The following information is transmitted using SCI Format 1-A.

[0106] - Priority - 3 bits

[0107] - Frequency resource allocation - If the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, ceiling(log2(N SL subChannel (N SL subChannel +1) / 2)) bits; otherwise, if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3, the ceiling log2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0108] - Time resource allocation - 5 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 2; otherwise, 9 bits if the value of the upper layer parameter sl-MaxNumPerReserve is set to 3

[0109] -Resource reservation cycle -ceiling(log2N rsv_period ) bits, where N rsv_period is the number of entries in the upper layer parameter sl-ResourceReservePeriodList if the upper layer parameter sl-MultiReserveResource is set; otherwise, a 0 bit

[0110] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns set by the upper layer parameter sl-PSSCH-DMRS-TimePatternList

[0111] -2 nd -stage SCI format - 2 bits as defined in Table 5

[0112] Beta_Offsets indicator - 2 bits as provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0113] Number of DMRS ports - 1 bit as defined in Table 6

[0114] -Modulation and coding method - 5 bits

[0115] Additional MCS table indicator - 1 bit if one MCS table is set by the upper layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the upper layer parameter sl-Additional-MCS-Table; 0 bit otherwise.

[0116] PSFCH overhead indicator - 1 bit if upper layer parameter sl-PSFCH-Period=2 or 4; 0 bit otherwise

[0117] Reserved Bits - The number of bits determined by the upper layer parameter sl-NumReservedBits, which is set to 0.

[0118] [Table 5]

[0119] [Table 6]

[0120] An example of SCI format 2-A will be described below.

[0121] In HARQ operation, if the HARQ-ACK information includes an ACK or a NACK, or if the HARQ-ACK information includes only a NACK, or if there is no feedback of the HARQ-ACK information, SCI format 2-A is used for decoding the PSSCH.

[0122] The following information is transmitted via SCI Format 2-A:

[0123] - HARQ process number - 4 bits

[0124] -New Data Indicator - 1 bit

[0125] -redundancy version - 2 bits

[0126] - Source ID - 8 bits

[0127] -Destination ID - 16 bits

[0128] HARQ feedback activation / deactivation indicator - 1 bit

[0129] Cast Type Indicator - 2 bits as defined in Table 7

[0130] -CSI Request - 1 bit

[0131] [Table 7]

[0132] An example of SCI format 2-B will be described below.

[0133] In HARQ operation, if the HARQ-ACK information includes only NACK or there is no feedback of HARQ-ACK information, SCI format 2-B is used for decoding the PSSCH.

[0134] The following information is transmitted via SCI Format 2-B:

[0135] - HARQ process number - 4 bits

[0136] -New Data Indicator - 1 bit

[0137] -redundancy version - 2 bits

[0138] - Source ID - 8 bits

[0139] -Destination ID - 16 bits

[0140] HARQ feedback activation / deactivation indicator - 1 bit

[0141] - Zone ID - 12 bits

[0142] - Communication Range Requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0143] 8(a) or 8(b), in step S830, the first terminal may receive a PSFCH. For example, the first terminal and the second terminal may determine a PSFCH resource, and the second terminal may use the PSFCH resource to transmit HARQ feedback to the first terminal.

[0144] Referring to (a) of FIG. 8, in step S840, the first terminal can transmit SL HARQ feedback to the base station via the PUCCH and / or PUSCH.

[0145] FIG. 9 illustrates three cast types according to an embodiment of the present disclosure. The embodiment of FIG. 9 can be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 9 illustrates broadcast-type SL communication, (b) of FIG. 9 illustrates unicast-type SL communication, and (c) of FIG. 9 illustrates groupcast-type SL communication. In the case of unicast-type SL communication, a terminal can perform one-to-one communication with another terminal. In the case of groupcast-type SL communication, a terminal can perform SL communication with one or more terminals in a group to which the terminal belongs. In various embodiments of the present disclosure, SL groupcast communication can be replaced with SL multicast communication, SL one-to-many communication, etc.

[0146] The Hybrid Automatic Repeat Request (HARQ) procedure will now be described.

[0147] For example, SL HARQ feedback can be enabled for unicast. In this case, in non-CBG (non-Code Block Group) operation, if a receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal can generate a HARQ-ACK. The receiving terminal can then transmit the HARQ-ACK to the transmitting terminal. On the other hand, if the receiving terminal cannot successfully decode a transmission block associated with the PSCCH after decoding a PSCCH targeted at the receiving terminal, the receiving terminal can generate a HARQ-NACK. The receiving terminal can then transmit the HARQ-NACK to the transmitting terminal.

[0148] For example, SL HARQ feedback can be enabled for groupcast. For example, in non-CBG operation, two HARQ feedback options can be supported for groupcast.

[0149] (1) Groupcast Option 1: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal can transmit a HARQ-NACK to the transmitting terminal via a PSFCH. On the other hand, if the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal does not transmit a HARQ-ACK to the transmitting terminal.

[0150] (2) Groupcast Option 2: After a receiving terminal decodes a PSCCH targeted at the receiving terminal, if the receiving terminal fails to decode a transmission block associated with the PSCCH, the receiving terminal can transmit a HARQ-NACK to the transmitting terminal via a PSFCH. If the receiving terminal decodes a PSCCH targeted at the receiving terminal and successfully decodes a transmission block associated with the PSCCH, the receiving terminal can transmit a HARQ-ACK to the transmitting terminal via a PSFCH.

[0151] For example, when groupcast option 1 is used for SL HARQ feedback, all terminals performing groupcast communication can share the PSFCH resource, e.g., terminals belonging to the same group can transmit HARQ feedback using the same PSFCH resource.

[0152] For example, when groupcast option 2 is used for SL HARQ feedback, each terminal performing groupcast communication can use different PSFCH resources for transmitting HARQ feedback. For example, terminals belonging to the same group can transmit HARQ feedback using different PSFCH resources.

[0153] In this specification, 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.

[0154] The UE procedure for reporting HARQ-ACK in the sidelink will now be described.

[0155] The UE uses N to transmit a PSFCH containing HARQ-ACK information in response to the PSSCH reception. PSSCH subchThe scheduling of PSSCH reception on one or more subchannels from the subchannels may be indicated by an SCI format. The UE provides HARQ-ACK information including ACK or NACK, or only NACK.

[0156] The UE can be provided with the number of slots in the resource pool for PSFCH transmission occasion resources by sl-PSFCH-Period-r16. If the number is 0, PSFCH transmission from the UE is disabled in the resource pool. The UE can be provided with k mod N PSFCH PSSCH = 0, slot t′ k SL (0≦k <T′ max ) where t' k SL is a slot that belongs to the resource pool, and T′ max is the number of slots belonging to the resource pool within 10240 msec, and N PSFCH PSSCH is provided by sl-PSFCH-Period-r16. The UE can be instructed by higher layers not to transmit a PSFCH in response to PSSCH reception. If the UE receives a PSSCH in a resource pool and the HARQ feedback enabled / disabled indicator field included in the associated SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information via a PSFCH transmission in the resource pool. The UE transmits the PSFCH in the first slot, which is the slot after the minimum number of slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool including the PSFCH resource and after the last slot of PSSCH reception.

[0157] The UE determines a set M of PRBs in the resource pool for PSFCH transmission on PRBs of the resource pool. PSFCH PRB、setThe number of subchannels for the resource pool provided by sl-NumSubchannel is N. subch and N PSFCH PSSCH For a smaller or the same number of PSSCH slots associated with a PSFCH slot, the UE PRB、set PSFCH Among the PRBs, [(i+j·N PSFCH PSSCH )·M PSFCH subch、slot , (i+1+j·N PSFCH PSSCH )·M PSFCH subch、slot -1] PRB is allocated to slot i and subchannel j of the PSSCH slot linked to the PSFCH slot. 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 with increasing i and continues with increasing j. PSFCH PRB、set N subch N PSFCH PSSCH We expect it to be a multiple of .

[0158] The UE determines the number of PSFCH resources available for multiplexing HARQ-ACK information included in the PSFCH transmission as R PSFCH PRB、CS =N PSFCH type M PSFCH subch、slot N PSFCH CS Here, N PSFCH CS is the number of cyclic shift pairs for the resource pool, and based on instructions from the upper hierarchy,

[0159] -N PSFCH type= 1 and M PSFCH subch、slot The PRB is associated with the starting subchannel of the corresponding PSSCH.

[0160] -N PSFCH type =N PSSCH subch and N PSSCH subch M PSFCH subch、slot PRB is the N of the corresponding PSSCH. PSSCH subch Associated with one or more of the sub-channels.

[0161] The PSFCH resources are first PSFCH type M PSFCH subch、slot PRBs are indexed in ascending order of PRB index, and then N PSFCH CS The cyclic shift pairs are indexed in ascending order of their cyclic shift pair indexes.

[0162] The UE receives the index of the PSFCH resource for PSFCH transmission (P ID +M ID ) mod R PSFCH PRB、CS Here, P ID is the physical layer source ID provided by the SCI format 2-A or 2-B that schedules PSSCH reception, and M ID is the ID of the UE that receives the PSSCH indicated by the higher layer if the UE detects SCI format 2-A with the cast type indicator field value '01', otherwise, M ID is 0.

[0163] The UE uses Table 8 to determine N PSFCH CS and determine the m0 value for calculating the cyclic shift α value from the cyclic shift pair index corresponding to the PSFCH resource index.

[0164] [Table 8]

[0165] If the UE detects SCI format 2-A with a cast type indicator field value of '01' or '10', as shown in Table 9, or if the UE detects SCI format 2-B or SCI format 2-A with a cast type indicator field value of '11', as shown in Table 10, the UE shall use the value m for calculating the cyclic shift α value. cs The UE applies one cyclic shift of the cyclic shift pair to the sequence used for PSFCH transmission.

[0166] [Table 9]

[0167] [Table 10]

[0168] Alternatively, a UE may be assigned a set of non-contiguous RBs (equally spaced apart) in frequency. Such a set of non-contiguous RBs can be called interlaced RBs. This is useful in spectrum (e.g., shared spectrum) where constraints such as occupied channel bandwidth (OCB) and power spectral density (PSD) apply.

[0169] 10 illustrates an interlaced RB according to one embodiment of the present disclosure. The embodiment of FIG. 10 can be combined with various embodiments of the present disclosure.

[0170] Referring to Figure 10, multiple interlaces of RBs are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} can be composed of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M can represent the number of interlaced RBs given by Table 11.

[0171] [Table 11]

[0172] A communication device (e.g., a device proposed through various embodiments of the present disclosure, a UE, a vehicle, a drone, etc.) can transmit a signal / channel using one or more interlaced RBs.

[0173] On the other hand, in the next-generation system, a terminal can perform sidelink transmission and / or reception operations in an unlicensed band. Meanwhile, when operating in an unlicensed band, band-specific regulations or requirements dictate that a channel sensing operation (e.g., energy detection / measurement) for a channel to be used precede a terminal's transmission. Only when the channel sensing result determines that the channel or RB set to be used is idle (e.g., when the measured energy is below or equal to a specific threshold), the terminal can transmit in the unlicensed band. When the channel sensing result determines that the channel or RB set to be used is busy (e.g., when the measured energy is above or exceeds a specific threshold), the terminal can cancel all or part of the transmission in the unlicensed band. Meanwhile, when operating in an unlicensed band, the terminal can omit or simplify the channel sensing operation (make the channel sensing interval relatively small) within a certain time period after transmission in a specific time interval. After a certain time period has elapsed after transmission, the terminal can determine whether to transmit after performing a general channel sensing operation. On the other hand, in the case of transmission in an unlicensed band, depending on regulations or requirements, the time duration and / or the size of the frequency occupied area and / or the power spectral density (PSD) of the signal / channel transmitted by the terminal may be at a certain level or above. On the other hand, in an unlicensed band, in order to simplify channel sensing, the content that a channel secured through initial general channel sensing is occupied for a certain time is notified through COT (channel occupancy time) interval information, and the maximum length of the COT interval may be set differently depending on the priority value of the service or data packet.

[0174] On the other hand, the base station can share the COT interval it has secured through channel sensing via DCI transmission, and the terminal can perform a specific (instructed) channel sensing type and / or CP extension within the COT interval based on the DCI information received from the base station. On the other hand, the terminal can share the COT interval it has secured through channel sensing with the base station that is the receiver of the terminal's UL transmission, and related information is provided via the UL via configured grant-uplink control information (CG-UCI). In this situation, the base station can perform simplified channel sensing within the COT interval shared by the terminal. Meanwhile, in the case of sidelink communication, there are situations in which the terminal receives instructions from the base station about resources to be used for sidelink transmission via DCI or RRC signaling, such as Mode 1 resource allocation (RA) operation, and there are also situations in which the terminal performs sidelink transmission and reception via UE-to-UE sensing without the assistance of the base station, such as Mode 2 RA operation.

[0175] On the other hand, in the case of channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, DL transmission is performed according to the procedures shown in Tables 12 and 13.

[0176] [Table 12]

[0177] [Table 13]

[0178] On the other hand, in the case of channel access type 1, which can be used regardless of the channel occupancy time (COT) setting, UL transmission is performed according to the procedures shown in Tables 14 and 15.

[0179] [Table 14]

[0180] [Table 15]

[0181] Meanwhile, the simplified channel access type 2 is used before transmission within the channel occupancy time (COT), and the DL transmission is performed according to the procedure shown in Table 16.

[0182] [Table 16]

[0183] Meanwhile, simplified channel access type 2 is used before transmission within the channel occupancy time (COT), and UL transmission is performed according to the procedure shown in Table 17.

[0184] [Table 17]

[0185] In an embodiment of the present disclosure, TYPE 2 ASL channel access can be a method similar to TYPE 2 ADL and / or UL channel access. For example, TYPE 2 ASL channel access is performed in a sensing interval of T_short_sl=25 us, which consists of a duration of T_f=16 us followed by one sensing slot, where T_f can include the sensing slot at its beginning. The basic IDLE determination in TYPE 2 ASL channel access can also borrow the IDLE determination in DL or UL channel access.

[0186] In an embodiment of the present disclosure, TYPE 2 BSL channel access can be a method similar to TYPE 2 BDL and / or UL channel access. For example, in the case of TYPE 2 BSL channel access, a terminal can perform transmission immediately after sensing a channel in an idle state within a duration of T_f=16 us. T_f can include sensing slots occurring within the last 9 us of T_f. In TYPE 2 BSL channel access, the basic IDLE determination can also borrow from the IDLE determination in DL or UL channel access.

[0187] In an embodiment of the present disclosure, TYPE 2 CSL channel access may be a method similar to TYPE 2 CDL and / or UL channel access. For example, in the case of TYPE 2 CSL channel access, the terminal does not perform channel sensing. Instead, the time interval for SL transmission may be up to 584 us.

[0188] In an embodiment of the present disclosure, TYPE 1 SL channel access may be a method similar to TYPE 1 DL and / or UL channel access. For example, the UE may randomly derive an integer value N based on a contention window size corresponding to a priority class. If the channel sensing result for a T_d-sized defer duration corresponding to the priority class is idle, the UE may decrement the N-1 counter value in units of T_sl if idle. If the counter value is 0, the UE may occupy the RB set or channel targeted for channel sensing. If a portion of the channel sensing result for the T_sl duration is determined to be busy, the UE may maintain the counter value as it is until the channel sensing result for the T_d-sized defer duration is again idle, and the UE may continue to perform channel sensing. In the above, the defer duration of T_d length is composed of m_p consecutive T_sl periods after T_f=16us, where m_p is a value determined by the priority class (p), and T_sl=9us may be the time period during which channel sensing is performed.

[0189] CAPC (Channel Access Priority Class) will be explained below.

[0190] MACCE and CAPC of radio bearers can be fixed or configurable to operate in FR1:

[0191] - Padding BSR (Buffer Status Report) and recommended bit rate MACCE are fixed to the lowest priority

[0192] -Fixed to highest priority for SRB0, SRB1, SRB3 and 6MACCE;

[0193] Configured by the base station for SRB2 and DRB.

[0194] When selecting a CAPC for a DRB, the base station takes into account the 5QI of all QoS flows multiplexed into the DRB, while also considering fairness between other traffic types and transmissions. Table 18 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC to be used for a given QoS flow. For standardized 5QI, CAPC is defined as shown in the table below, and for non-standardized 5QI, the CAPC with the most suitable QoS characteristics should be used.

[0195] [Table 18]

[0196] Table 19 shows the m by channel connection priority class in DL. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different examples.

[0197] [Table 19]

[0198] Refer to Table 19 to define the CWS (contention window size) and maximum COT value for each CAPC. For example, T d =T f +m p *T sl It could be.

[0199] Table 20 shows the channel access priority classes in the UL. p, minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are different examples.

[0200] [Table 20]

[0201] Refer to Table 20 to define the CWS (contention window size) and maximum COT value for each CAPC. For example, T d =T f +m p *T sl It could be.

[0202] In an embodiment of the present disclosure, when a terminal occupies a channel through TYPE 1 SL channel access, the terminal may not be ready to transmit a sidelink transmission. In this case, the terminal may configure a defer duration of T_d and a sensing duration of T_sl immediately before the sidelink transmission it is ready to transmit. If both are busy, the terminal may immediately perform the sidelink transmission. If either one is busy, the terminal may perform TYPE 1 SL channel access again. For example, if sidelink transmission is difficult when channel sensing ends (e.g., if channel sensing ends after the start of sidelink transmission), the terminal may reselect the sidelink transmission resource.

[0203] On the other hand, when transmitting on a shared spectrum frequency band, a wireless device may transmit a cyclic prefix extension (CPE) before (or along with) transmission to enable orthogonal frequency division multiplexing (OFDM) symbol layout and reduce inter-symbol interference (ISI). A terminal may also perform CPE transmission to increase the probability that a channel that has successfully passed LBT can be used for actual transmission. For example, if a terminal has successfully passed LBT on a specific channel, the terminal may perform CPE transmission to prevent other devices from occupying the specific channel.

[0204] 11 illustrates a method for a terminal to perform CPE according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0205] Referring to FIG. 11, in order to enable OFDM symbol layout, to reduce ISI, to increase the probability that a channel that has successfully completed LBT can be used for actual transmission, and / or to prevent a channel that has successfully completed LBT from being occupied by another device, the terminal may perform CPE transmission before (or together with) SL transmission.

[0206] On the other hand, if the time domain or the length of the time domain in which the CPE for SL transmission (e.g., PSCCH / PSSCH transmission, PSFCH transmission, S-SSB transmission, etc.) is executed is different between different devices, the CPE of a specific device may cause the LBT of other devices to fail. That is, the CPE executed by a specific device for SL transmission may affect the LBT for SL transmission of other devices.

[0207] FIG. 12 is a diagram for explaining problems that occur due to different CPEs.

[0208] Referring to FIG. 12, in order to increase the probability of SL transmission in the unlicensed band, the device may execute CPE. In this case, if the time domain or length of the time domain in which the CPE executes is different between different devices, the LBT failure of another device may occur due to the CPE of a specific device. Specifically, for example, if the CPE lengths of the devices are different, the first and second devices may fail LBT in the T1 section due to the CPE of a third device, and the first and second devices may not be able to perform SL transmission. Also, the first device may fail LBT in the T2 section due to the CPE of the second device, and the first device may not be able to perform SL transmission. Similarly, although not shown, the third device may also fail LBT due to the CPE of another device, and the third device may not be able to perform SL transmission. This may result in a degradation of SL communication performance.

[0209] On the other hand, if two transmissions starting at the same time cannot recognize each other's transmissions, they may determine each other as idle through channel sensing results, resulting in a collision. On the other hand, if the start time is adjusted randomly through CP extension and / or puncturing of one or more start symbols, some channels may be determined to be busy during channel sensing for each transmission. This may result in a problem in which FDM cannot be supported between different resources within the same RB set. On the other hand, in the case of sidelink mode 2 resource (re)selection, the problem of overlapping transmission resources for different transmissions is avoided or mitigated by using reserved resources indicated in previous transmissions.

[0210] For example, during sidelink transmission (e.g., PSCCH / PSSCH transmission and / or PSFCH and / or S-SSB), the UE may adjust the start position of the actual sidelink channel / signal transmission by partially puncturing a CP extension and / or one or more start symbols from the initial symbol, where the length of the CP extension and / or the length of the puncturing may be selected randomly within a specific (pre-)set and / or pre-defined candidate. For example, randomly adjusting the start position of the actual sidelink channel / signal transmission is limited to cases where the sidelink channel / signal uses all frequency resources in an RB set, and / or where the number of allocated RBs is equal to or greater than a (pre-)set or pre-defined value, and / or where the number of allocated RBs relative to the total number of RBs in the RB set is equal to or greater than a (pre-)set or pre-defined value, and / or where the sidelink channel / signal transmission is an initial transmission, and / or where the sidelink channel / signal has not previously been designated as a reserved resource. The reason for this is that in the case of initial transmission, collisions between different transmissions cannot be avoided by the sidelink reserved resource indication method.

[0211] For example, when the UE is performing sidelink transmission (e.g., PSCCH / PSSCH transmission and / or PSFCH and / or S-SSB), the operation of adjusting the start position of the actual sidelink channel / signal transmission using a CP extension and / or single or multiple start symbols from the first symbol is used only when the number of allocated RBs is equal to or greater than a (pre-) set or pre-defined value, and / or when the number of allocated RBs with respect to the total number of RBs in an RB set is equal to or greater than a (pre-) set or pre-defined value, and / or when the sidelink channel / signal transmission is an initial transmission, and / or when the sidelink channel / signal is not indicated as a previously reserved resource. For example, when the UE is performing sidelink transmission (e.g., PSCCH / PSSCH transmission and / or PSFCH and / or S-SSB), the operation of adjusting the start position of the actual sidelink channel / signal transmission using a CP extension and / or single or multiple start symbols from the first symbol is used only when the resource pool is configured with a single RB set. For example, when a terminal is performing sidelink transmission (e.g., PSCCH / PSSCH transmission and / or PSFCH and / or S-SSB), the operation of adjusting the start position of the actual sidelink channel / signal transmission using a CP extension and / or single or multiple start symbols from the first symbol is used when the selected resource for the sidelink channel / signal transmission is not frequency-division multiplexed with the reserved resource of another terminal derived based on the SCI or inter-terminal coordination information received by the terminal. For example, the case where FDM is not performed in the above case may occur when the reserved resource of another terminal derived based on the SCI or inter-terminal coordination information received by the terminal is not in the same slot and / or the same RB set.

[0212] For example, when (re)selecting resources for a sidelink channel / signal transmission with multiple (pre)configured start positions, if the transmission resources are selected in a manner that is FDM-multiplexed with the reserved resources of other terminals and / or in a manner that exists in the same slot and / or the same RB set as the reserved resources of other terminals, the terminal can perform the sidelink channel / signal transmission based on the (pre)configured single CP extension (length) and / or the position of the single start symbol.

[0213] For example, if a resource reservation is detected or transmitted for the RB set(s) and slot(s) of the intended PSCCH / PSSCH transmission, the terminal may select a (pre-) configured default CPE starting position for the PSCCH / PSSCH transmission. Otherwise, the terminal may randomly select a CPE starting position for the PSCCH / PSSCH transmission. In this case, for example, the CPE starting position may be randomly selected from one or more CPE starting position candidates (pre-) configured according to the priority of the PSCCH / PSSCH transmission. For example, one or more CPE starting position mappings according to priority may be (pre-) configured. For example, the priority may be L1 priority (e.g., priority information included in the SCI).

[0214] 13 illustrates a method for a terminal to perform CPE according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0215] Referring to FIG. 13, slot #N may be a slot in which resource reservation is not detected or a slot not reserved by an SCI transmitted in a previous slot (e.g., a slot in which initial transmission is performed). Slot #K may be a slot in which resource reservation is detected or a slot reserved by an SCI transmitted in a previous slot (e.g., slot #N). In this case, the UE may randomly select a CPE starting position before PSCCH / PSSCH transmission in slot #N. In this case, for example, the CPE starting position may be randomly selected from one or more CPE starting position candidates configured (in advance) according to the priority of PSCCH / PSSCH transmission. For example, one or more CPE starting position mappings according to priority may be configured (in advance). For example, the priority may be L1 priority (e.g., priority information included in the SCI). Alternatively, the UE may select a default CPE starting position configured (in advance) before PSCCH / PSSCH transmission in slot #K. Then, the UE may perform PSCCH / PSSCH transmission based on the selected CPE.

[0216] For example, when (re)selecting resources for a sidelink channel / signal transmission with multiple (pre)configured start positions, if a transmission resource is selected in a manner that is FDM-multiplexed with reserved resources of another terminal and / or is in the same slot and / or the same RB set as the reserved resources of another terminal, the terminal can perform sidelink channel / signal transmission by inheriting the CP extension (length) and / or start symbol position for the reserved resources of another terminal that are FDM-multiplexed or in the same slot and / or the same RB set. For example, the CP extension (length) and / or start symbol position for the reserved resources can be indicated and / or (pre)configured in the first SCI and / or second SCI and / or PSSCH indicating the reserved resources. For example, when resource (re)selection is performed for a sidelink channel / signal transmission with multiple (pre)configured start positions, if a transmission resource is selected in a manner that is FDMed with reserved resources of other terminals and / or is selected in a manner that is in the same slot and / or the same RB set as reserved resources of other terminals, the terminal may perform resource (re)selection by avoiding FDM with reserved resources of other terminals or by avoiding resources in the slot and / or RB set.

[0217] In an embodiment of the present disclosure, the terminal may determine whether to FDM the reserved resources of other terminals derived based on the sidelink channel / signaling and reception of SCI or inter-terminal coordination information and / or whether the reserved resources of other terminals exist in the same slot and / or the same RB set, based on the RSRP measurement values ​​for the reserved resources and / or the representative SL reception priority value or CAPC value for the reserved resources and / or the representative SL transmission priority value or CAPC value for the sidelink channel / signaling of the terminal and / or the congestion control level and / or the channel occupancy ratio (CR) / channel busy ratio (CBR), etc. For example, the terminal may determine whether to FDM the reserved resources of other terminals derived based on the sidelink channel / signaling and reception of SCI and / or whether the reserved resources of other terminals exist in the same slot and / or the same RB set, based on the RSRP measurement values ​​for the reserved resources and / or the SL transmission priority value and / or the SL reception priority value for the reserved resources. This method is advantageous in terms of protecting the reserved resources of other terminals that are FDMed. For example, if the RSRP measurement value for the reserved resources is greater than or equal to a first threshold, and / or if the RSRP measurement value for the reserved resources is less than or equal to a second threshold, and / or if the SL transmission priority value is greater than and / or equal to the SL reception priority value for the reserved resources, and / or if the SL reception priority value for the reserved resources is less than or equal to the second threshold, the terminal may determine to FDM the reserved resources of other terminals derived based on sidelink channel / signal transmission and SCI reception and / or determine that the reserved resources of other terminals exist in the same slot and / or the same RB set. For example, the first threshold may be a value (pre-)set for each resource pool and / or for each SL transmission priority and / or for each SL reception priority and / or for each congestion control level and / or a value derived from the above values ​​(e.g., via boosting). For example, the second threshold may be a value (pre-)set for each resource pool and / or for each congestion control level.For example, if the RSRP measurement value for the reserved resource is less than or equal to a first threshold, and / or if the RSRP measurement value is greater than or equal to a second threshold, and / or if the SL transmission priority value is less than and / or equal to the SL reception priority value for the reserved resource, and / or if the SL transmission priority value is less than or equal to the second threshold, the terminal may not decide to FDM the reserved resources of other terminals derived based on sidelink channel / signal transmission and SCI reception and / or may not determine that reserved resources of other terminals exist in the same slot and / or the same RB set, or may ignore the reserved resources of other terminals.

[0218] Table 21 shows an example of SL RSSI (received signal strength indicator).

[0219] [Table 21]

[0220] Table 22 shows an example of SL CR (channel occupancy ratio).

[0221] [Table 22]

[0222] NOTE 1: a is a positive integer, and b is 0 or a positive integer. a and b are determined by the higher layer parameters sl-TimeWindowSizeCR, b < (a + b + 1) / 2, where a + b + 1 = 1000 or 1000 2 u The slot is determined by the UE implementation, and n+b must not exceed the last transmission opportunity of the grant for the current transmission.

[0223] NOTE 2: The SL CR is evaluated for each (re)transmission.

[0224] NOTE 3: When evaluating the SL CR, the UE should assume that the transmission parameters used in slot n are reused by the existing grant(s) in slot [n+1, n+b] without packet dropping.

[0225] NOTE 4: The slot index is based on the physical slot index.

[0226] NOTE 5: SL CR can be calculated by priority level.

[0227] NOTE 6: A resource is considered approved if it is a member of the selected sidelink grant.

[0228] Table 23 shows an example of SL CBR (channel busy ratio).

[0229] [Table 23]

[0230] NOTE 1: The slot index is based on the physical slot index.

[0231] For example, in the case of symbol puncturing, the presence or absence of puncturing and / or the length of the permitted time interval may vary depending on the subcarrier spacing (SCS) for sidelink communication. For example, in the case of 15 kHz and / or 30 kHz SCS, puncturing may be permitted for a part of the time interval of a symbol, but puncturing may not be permitted for 30 kHz, 60 kHz, and / or 120 kHz.

[0232] On the other hand, in the case of sidelink communication on a shared spectrum, channel sensing failure can cause problems such as long latency.

[0233] Figure 14 illustrates the problem of increased latency due to channel sensing failure. The embodiment of Figure 14 can be combined with various embodiments of the present disclosure.

[0234] Referring to FIG. 14, a terminal that selects / reserves resources on slot #1 can perform an LBT before performing SL transmission on the shared spectrum. If the terminal fails the LBT, the terminal is not permitted 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 permitted (e.g., slots not belonging to a resource pool), an LBT failure can cause a serious delay in SL communication. In particular, if slots where SL communication is not permitted (e.g., slots not belonging to a resource pool) are configured consecutively, the above problem becomes even more serious.

[0235] Therefore, in order to mitigate the problem of long delays due to channel sensing failures, various starting symbol positions or starting time positions within a slot are allowed for sidelink communications, particularly PSCCH / PSSCH transmissions.

[0236] 15 illustrates the locations of multiple start symbols or multiple start times within a slot according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0237] 15, the position of the start symbol in a slot can be set to symbol #A and symbol #B. In this case, for example, the terminal can perform SL transmission using symbol #A to the last symbol in the slot, or the terminal can perform SL transmission using symbol #B to the last symbol in the slot.

[0238] For example, when a terminal transmits a PSCCH / PSSCH from an additionally permitted start position, the PSCCH / PSSCH transmission signal is transmitted in a delayed form according to the start position. For example, in the above case, the length of the PSCCH / PSSCH transmission interval is reduced compared to when the PSCCH / PSSCH transmission starts at the basic start position, and the later part of the PSCCH / PSSCH transmission signal from the time axis is punctured.

[0239] For example, in the case of a PSCCH DMRS (demodulation reference signal) and / or a PSSCH DMRS and / or a CSI-RS sequence, if no transmission delay is performed, a sequence generated based on a case where it starts at a basic starting position (i.e., a sequence generated based on a symbol index to which the RS is mapped in the above situation) is mapped to a symbol index changed by the transmission delay. For example, in the above, the symbol index at which the RS is actually transmitted and the symbol index used to generate the RS sequence may differ.

[0240] For example, the PSCCH DMRS and / or PSSCH DMRS and / or CSI-RS sequence is changed to a sequence generated based on a symbol index at which actual transmission is generated due to transmission delay.

[0241] In an embodiment of the present disclosure, different RS types are processed differently. For example, a PSCCH DMRS uses a reference sequence before the transmission delay, but a PSSCH DMRS can use a sequence modified based on a reference symbol index after the transmission delay.

[0242] For example, when a terminal transmits a PSCCH / PSSCH from an additionally permitted start position, a portion of the PSCCH / PSSCH transmission signal (symbols before the start position) is punctured according to the start position. However, the puncturing may make it impossible or inefficient to decode the first SCI and / or the second SCI. In this case, even if the start position is changed and the PSCCH / PSSCH is transmitted, the receiving terminal may not be able to properly decode the PSCCH / PSSCH.

[0243] For example, the terminal may repeatedly transmit the PSCCH starting from an additional permitted starting position. For example, the set of symbols onto which the PSCCH is repeatedly mapped may be determined so as not to overlap with a specific PSSCH DMRS symbol candidate. For example, the specific PSSCH DMRS symbol candidate may include DMRS symbols for all PSSCH DMRS patterns supported in NR SL. For example, the specific PSSCH DMRS symbol candidate may include DMRS symbols for 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 avoidance. The specific PSSCH DMRS pattern may have two symbols, in which case puncturing of the PSCCH / PSSCH signal may not be permitted. For example, the number of symbols for the PSCCH repetition may be the number of symbols (pre-set) for PSCCH transmission excluding AGC symbols. For example, the number of symbols for the PSCCH repetition may be the number of symbols (pre-set) for PSCCH transmission plus the number of AGC symbols. For example, the number of symbols for PSCCH transmission may be significantly increased, and the position at which the PSCCH / PSSCH is allowed to start may be (pre-set) within the PSCCH symbol interval. For example, the starting symbol position for the PSCCH may be changed to be located in the middle of the PSSCH symbol interval. In this case, the AGC symbol for the PSCCH / PSSCH may be a copy of the first symbol of the PSSCH, or a copy of the PSCCH / PSSCH symbol including the first symbol of the PSCCH. For example, the starting position of the PSCCH may be (pre-set) for each resource pool. For example, the symbol group to which the PSCCH with the changed starting position is mapped may be determined so as not to overlap with PSSCH DMRS symbol candidates. Table 24 shows an example of the time-domain location of the PSSCH DM-RS in NR SL.

[0244] [Table 24]

[0245] The DM-RS symbol positions are given by l in Table 24, where the number of PSSCH DM-RSs is indicated in SCI, and l d is the scheduled resource duration for the transmission of the PSSCH and associated PSCCH, including the replicated OFDM symbols.

[0246] For example, the UE may repeatedly map the second SCI starting from an additional permitted start position. For example, when mapping the second SCI, an upper limit on the amount of resources to which the second SCI is mapped is determined only up to the next start position. For example, a better scaling value (e.g., a better_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 second SCI repetition. For example, the UE may increase the number of REs for the second SCI, and the permitted positions for the PSCCH / PSSCH start are within the symbol interval to which the second SCI is mapped. For example, the symbol interval to which the second SCI is mapped may be determined to include all or part of the candidate positions for the permitted PSCCH / PSSCH start. For example, an increase in the number of REs for the second SCI mapping increases the better value for the second SCI mapping. Alternatively, for example, a scaling value may be further applied when deriving the number of REs for the second SCI mapping, and the scaling value may be set (in advance) and / or separately indicated as better in the first SCI. For example, the symbol position at which the second SCI mapping starts may be changed to a point later than the symbol following the first PSSCH DMRS symbol. For example, the starting symbol position for the second SCI mapping may be determined to be a certain symbol offset or later with respect to the first symbol position of the PSCCH / PSSCH (with or without AGC), the first symbol of the slot, or the first PSSCH DMRS transmission symbol (or the next symbol). For example, the certain symbol offset may be set (in advance) and / or indicated in the first SCI. For example, the starting symbol position for the second SCI mapping may be changed to the symbol following 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 permitted starting positions for the PSCCH / PSSCH. For example, if a PSSCH DMRS is transmitted at the changed symbol position, mapping of the second SCI may start from the symbol following the DMRS symbol.

[0247] For example, if multiple starting (symbol) positions are allowed for PSCCH / PSSCH transmission within a slot (e.g., multiple starting symbol positions are (pre)configured in a resource pool), when a terminal transmits a position-based PSCCH / PSSCH of a first starting symbol, the terminal may repeat, in a specific situation, the content mapped to the RE of another symbol position for the RE corresponding to the position of the second starting symbol. For example, the copied other symbol position may be (pre)configured and / or may be the first symbol position for the position-based PSCCH / PSSCH transmission of the first starting symbol and / or a symbol position before or after the position of the second starting symbol. For example, the specific situation may be when the position of the second starting symbol is not a PSSCH DMRS symbol for position-based PSCCH / PSSCH transmission of the first starting symbol, and / or when the number of CBs (code blocks) is equal to or greater than a certain level (e.g., a predefined or (pre)set threshold), and / or when the MCS value is equal to or greater than a certain level (e.g., a predefined or (pre)set threshold), and / or when the size of the TB is equal to or greater than a certain level (e.g., a predefined or (pre)set threshold), and / or when the number of RB sets constituting a resource pool is more than one or is equal to or greater than a certain level (e.g., a predefined or (pre)set threshold).

[0248] In an embodiment of the present disclosure, whether PSCCH / PSSCH transmission is possible at an additional start position may be applied differently depending on the PSSCH DMRS pattern or the number of DMRS symbols, and / or the channel access type for sidelink transmission, and / or the SL priority value and / or CAPC. For example, if there are no or only one PSSCH DMRS symbols remaining after changing the start position, the change of the start position may not be permitted.

[0249] In an embodiment of the present disclosure, adjusting the start position of an actual sidelink channel / signal transmission based on the channel sensing result is limited to the following cases: the sidelink channel / signal uses all frequency resources in an RB set; and / or the number of allocated RBs is equal to or greater than a (pre-) set or pre-defined value; and / or the number of allocated RBs relative to the total number of RBs in the RB set is equal to or greater than a (pre-) set or pre-defined value; and / or the sidelink channel / signal transmission is an initial transmission; and / or the sidelink channel / signal has not previously been designated as a reserved resource; and / or the sidelink channel / signal transmission is a retransmission.

[0250] On the other hand, in the case of TB transmission transmitted via PSSCH, if the number of CBs is large, all coded bits of a specific CB are punctured by changing the start position. In this case, if CBG-based transmission is not performed, partial transmission via changing the start position may not be suitable in terms of TB decoding performance.

[0251] For example, in an unlicensed band, a terminal may first map a PSSCH on the time axis and then map it on the frequency axis. For example, when mapping coded modulation symbols for a second SCI and / or TB, the terminal may perform RE mapping starting with the subcarrier with the lowest index in ascending order from the lowest symbol index. After all symbol indices have been incremented, the terminal may again perform RE mapping on the next subcarrier in ascending order from the lowest symbol index. The terminal may then repeat the above process. For example, mapping for a PSCCH is performed in the order of a symbol group index, a frequency side index, and a symbol index within a symbol group. For example, the different symbol intervals may be designated based on the symbols at which the PSCCH / PSSCH is permitted to start, and / or may be divided into time intervals where the PSCCH / PSSCH is punctured and other time intervals.

[0252] For example, the UE may divide each CB into two or more parts and perform mapping from different starting symbol indexes. For example, the different symbol intervals may be designated based on the symbols at which the PSCCH / PSSCH is allowed to start, and / or may be divided into a time interval where the PSCCH / PSSCH is punctured and another time interval. For example, the part of the CB mapped to the punctured part corresponds to a parity bit.

[0253] For example, the UE may change the order of CBs mapped from the starting symbol for each transmission, for example, the offset to the starting CB index for the first mapping may be indicated in the first SCI and / or the second SCI and / or determined by the slot index in which the PSCCH / PSSCH is transmitted.

[0254] For example, the terminal may generate and map a PSCCH / PSSCH signal based on the latest symbol index among the symbol indexes at which the PSCCH / PSSCH is allowed to start, and may copy and fill the remaining PSCCH / PSSCH resources with some of the symbols for the generated PSCCH / PSSCH. For example, the symbol group to be copied may be selected from the first symbol of the generated PSCCH / PSSCH.

[0255] On the other hand, even if multiple starting (symbol) positions are permitted for PSCCH / PSSCH transmission, the receiving terminal needs to derive the reserved resources and RSRP measurement values ​​of other terminals from the received SCI based on the positions of different starting symbols. For example, the symbol starting positions for the reserved resources indicated in the PSCCH / PSSCH can be set to be the same depending on the symbol starting position at which the terminal receives the PSCCH / PSSCH. For example, if the terminal receives the PSCCH / PSSCH at the first or second starting symbol, the symbol starting position for the reserved resources indicated in the PSCCH / PSSCH may be the position of the first or second starting symbol, respectively. For example, whether or not resource exclusion is applicable may differ depending on the symbol position of the reserved resources. For example, when transmitting the PSCCH / PSSCH, the terminal may indicate the starting symbol position for the reserved resources via the PSCCH and / or PSSCH for all reserved resources indicated in the PSCCH / PSSCH and / or for each reserved resource. For example, if a terminal receives a PSCCH / PSSCH at a first or second start symbol, the symbol start position for a reserved resource indicated in the PSCCH / PSSCH may be fixed to the position of the first start symbol (e.g., the position of the symbol that precedes it in time). For example, when a terminal performs sensing, it may use a PSCCH detected at a different symbol and / or a different RB set in the same slot for resource (re)selection.

[0256] For example, the reference signal type for RSRP measurement may differ depending on the position of the starting symbol for the PSCCH / PSSCH. For example, it may be (pre)configured whether the RSRP measurement is a PSCCH DMRS-based RSRP measurement or a PSSCH DMRS-based RSRP measurement depending on the position of the starting symbol for the PSCCH / PSSCH.

[0257] On the other hand, after transmitting the PSCCH / PSSCH, the terminal can expect to receive a PSFCH for the SL HARQ-ACK for the TB transmitted via the PSSSCH, and the receiving terminal may fail to transmit the PSFCH depending on the channel sensing result.

[0258] For example, as part of the method for mitigating frequent PSFCH transmission failures, simplified channel sensing is performed for PSFCH transmission. For example, the transmitting terminal may perform PSCCH / PSSCH transmission with SL HARQ-ACK feedback activated so that the number of PSFCH transmissions within a specific time interval (e.g., 50 ms or a (pre-set) value) is equal to or less than a certain level (e.g., 50 or a (pre-set) value) and / or so that the total length of the transmission intervals of PSFCHs transmitted within a specific time interval (e.g., 50 ms or a (pre-set) value) is less than and / or equal to a certain level (e.g., 2500 us or a (pre-set) value). For example, the scheduling constraint is performed per receiving terminal and / or per destination ID. For example, in this case, the receiving terminal may perform simplified channel sensing (e.g., Type 2A, Type 2B, or Type 2C) when transmitting the PSFCH.

[0259] For example, if the number of PSFCH transmissions within a specific time interval (e.g., 50 ms or a (pre-set) value) exceeds 50 and / or if the total length of the transmission intervals of the PSFCHs transmitted within a specific time interval (e.g., 50 ms or a (pre-set) value) is greater than and / or equal to a certain level (e.g., 2500 us or a (pre-set) value), the PSCCH / PSSCH receiving terminal can omit PSFCH transmission and / or perform type 1 channel access-based channel sensing for subsequent PSFCH transmissions (until the above condition is satisfied again). For example, in the above, the PSFCH transmitted by performing type 1 channel access is excluded from consideration when determining the above condition.

[0260] For example, as part of the method for mitigating frequent PSFCH transmission failures, the number of PSFCH occasions or slots associated with the PSCCH / PSSCH may be two or more. For example, a PSCCH / PSSCH transmitting terminal may indicate information such as the earliest PSFCH recognition or the next PSFCH recognition after the minimum PSSCH-to-PSFCH timing in the first SCI and / or the second SCI. In this case, if another terminal determines to exclude resources corresponding to the PSCCH / PSSCH from candidate resources upon two-resource (re)selection, the terminal may exclude the PSFCH resources indicated in the PSCCH / PSSCH and / or all PSFCH resources that can be indicated in the PSCCH / PSSCH from PSFCH candidate resources. Then, based on this, when the terminal transmits the PSCCH / PSSCH again, it may select a PSFCH resource from the PSFCH candidate set upon indication. For example, the relationship between the PSCCH / PSSCH and the PSFCH may exist for multiple timings. For example, the PSFCH resource set may be divided into a frequency side and / or a time side (symbol index) and / or a cyclic shift pair according to the timing. For example, in this case, a PSCCH / PSSCH receiving terminal may transmit SL HARQ-ACK feedback in the first associated PSFCH for which channel sensing has been successful. For example, in this case, a PSCCH / PSSCH transmitting terminal may attempt PSFCH detection for multiple PSFCH slots, and if an ACK exists in the HARQ-ACK state determined for each PSFCH slot, the PSCCH / PSSCH transmitting terminal may determine an ACK for the TB transmitted over the PSSCH.

[0261] Meanwhile, the terminal may allow multiple start symbols for PSCCH / PSSCH transmission. In this case, the terminal may prepare in advance PSCCH / PSSCH generation and associated waveforms based on multiple start symbols, and the terminal may transmit the PSCCH / PSSCH based on a specific start symbol depending on when the channel sensing result is determined to be a busy period. For example, depending on the symbol for which the start of the PSCCH / PSSCH is allowed, all or part of the indication value indicated by the terminal in the first SCI and / or the second SCI may differ. For example, in the case of the number of PSSCH DMRS symbols, different values ​​are indicated in the SCI for each symbol for which the start is allowed. This is because when the start symbol is different, the length of the PSSCH symbol interval may also differ, and therefore the number of supportable DMRS symbols may also differ. For example, in the case of the indicator for the second SCI format and / or the better offset value indicator and / or PSFCH overhead indicator used to adjust the number of REs to which the second SCI is mapped, different values ​​are indicated in the SCI for each symbol for which the start is allowed. The reason for this is that the length of the PSSCH symbol interval is changed to adjust the proportion of control information overhead.

[0262] For example, the terminal can ensure the same TB (transport block) size for PSCCH / PSSCH transmissions in which multiple start symbols are allowed. For example, if multiple PSCCH / PSSCH start symbols are allowed, the terminal can calculate the TB size based on the allocated number of REs derived based on the length of the maximum PSSCH symbol interval. For example, if multiple PSCCH / PSSCH start symbols are allowed, the terminal can calculate the TB size based on the allocated number of REs derived based on the length of the minimum PSSCH symbol interval. For example, if multiple PSCCH / PSSCH start symbols are allowed, the terminal can calculate the TB size based on the allocated number of REs derived based on the length of the average PSSCH symbol interval associated with the symbols in which start symbols are allowed. For example, if multiple PSCCH / PSSCH start symbols are allowed, the terminal can calculate the TB size based on the allocated number of REs derived based on the length of a reference PSSCH symbol interval set (in advance) for TBS calculation purposes. For example, if multiple PSCCH / PSSCH start symbols are allowed, the terminal can calculate the TB size based on the allocated number of REs derived based on the length of a reference PSSCH symbol interval indicated in the first SCI for TBS calculation purposes. For example, when multiple PSCCH / PSSCH starting symbols are allowed, the terminal may calculate the TB size based on the number of allocated REs derived based on the length of a reference PSSCH symbol interval indicated in the second SCI for TBS calculation. For example, when calculating the TB size, the number of REs to which the PSSCH DMRS overhead and / or the second SCI are mapped is determined based on the length of the PSSCH symbol interval used when calculating the TBS. For example, when calculating the TB size, the maximum value of the number of REs to which the PSSCH DMRS overhead and / or the second SCI are mapped is used, which can be determined based on the length of the PSSCH symbol interval and / or the PSCCH / PSSCH starting symbol index.For example, when calculating the TB size, the minimum value among values ​​derivable depending on the length of the PSSCH symbol interval and / or the PSCCH / PSSCH starting symbol index is used as the number of REs to which the PSSCH DMRS overhead and / or the second SCI are mapped. For example, when calculating the TB size, the average value among values ​​derivable depending on the length of the PSSCH symbol interval and / or the PSCCH / PSSCH starting symbol index is used as the number of REs to which the PSSCH DMRS overhead and / or the second SCI are mapped.

[0263] For example, the terminal may set the length of all PSSCH symbol intervals for the same TB. For example, the terminal may set the start symbols of the PSCCH / PSSCH for the same TB transmission. For example, the length of the PSSCH symbol interval is always the same regardless of the PSCCH / PSSCH start symbol.

[0264] For example, the UE may maintain the same indication values ​​indicated in the first SCI and / or the second SCI depending on the symbol at which the PSCCH / PSSCH is allowed to start. For example, in the case of the number of PSSCH DMRS symbols, if the length of the PSSCH symbol interval does not support the indicated number of DMRS symbols depending on the starting symbol of the PSSCH, the UE may substitute the actual length of the PSSCH symbol interval with the maximum number of DMRS symbols that can be supported for the length of the PSSCH symbol interval, which is smaller than the indicated number of DMRS symbols. For example, the maximum number of DMRS symbols that can be supported may be limited to being selected from values ​​(pre-set) configured in the resource pool. For example, the upper limit of the number of REs to which the second SCI is mapped is determined based on the number of allocated REs derived based on the length of the maximum PSSCH symbol interval and / or the length of the minimum PSSCH symbol interval and / or the length of the average PSSCH symbol interval related to the symbol at which the start is allowed. For example, in the case of the PSFCH overhead indicator, if a PSFCH resource is not allowed in the length of the PSSCH symbol period changed by the symbol for which the PSSCH start is allowed, the terminal may ignore the PSFCH overhead indicator even if the PSFCH overhead indicator is set to 1. In this case, the terminal may not consider the PSFCH overhead when calculating the TB size and / or the RE to which the second SCI is mapped, and the PSFCH overhead may be omitted.

[0265] For example, symbols permitted to start for the PSCCH / PSSCH are limited by an indication value indicated by the terminal in the first SCI and / or the second SCI. For example, according to the number of PSSCH DMRS symbols indicated by the terminal in the SCI, only symbols permitted to start corresponding to a length of a PSSCH symbol interval that can support the indicated number of DMRS symbols are considered / applied during PSCCH / PSSCH transmission. For example, according to the PSFCH overhead value indicated by the terminal in the SCI, only symbols permitted to start corresponding to a length of a PSSCH symbol interval that can support the indicated PSFCH overhead value are considered / applied during PSCCH / PSSCH transmission.

[0266] In an embodiment of the present disclosure, a terminal may perform different channel sensing for a starting symbol / position for a PSCCH / PSSCH within a slot. For example, the terminal may use different energy detection thresholds for each starting symbol / position. For example, the terminal may set the energy detection threshold for a second starting symbol / position lower than the energy detection threshold for a first starting symbol / position. This is done to minimize the influence of neighboring elements on the use of the second starting symbol / position. For example, the terminal may set the energy detection threshold for a second starting symbol / position higher than the energy detection threshold for a first starting symbol / position. This is done to increase the possibility of channel access at the second starting symbol / position after an LBT failure for the first starting symbol / position. For example, only when a PSSCH transmission is an initial transmission, a channel access attempt at the second starting symbol / position is performed after an LBT failure for the first starting symbol / position. For example, a channel access attempt at a second starting symbol / position after an LBT failure at a first starting symbol / position is performed only if the number of (re)transmissions for a PSSCH transmission is equal to or greater than a certain level (e.g., a (pre-)configured value). For example, if the SL priority value and / or CAPC value is equal to or less than a (pre-)configured threshold, a channel access attempt at a second starting symbol / position is performed after an LBT failure at a first starting symbol / position. The rationale for this is to provide more transmission opportunities for higher priority transmissions. For example, if the SL priority value and / or CAPC value is equal to or greater than a (pre-)configured threshold, a channel access attempt at a second starting symbol / position is performed after an LBT failure at a first starting symbol / position. For example, after an LBT failure at a first starting symbol / position based on a Type 1 channel access procedure, a channel access attempt at a second starting symbol / position is performed based on a Type 2 channel access procedure.For example, if an LBT for a first starting symbol / position fails based on a Type 1 channel access procedure and a channel access attempt is made at a second starting symbol / position, the ongoing Type 1 channel access procedure continues. For example, if an LBT for a first starting symbol / position fails based on a Type 2B channel access procedure, a channel access attempt at a second starting symbol / position is made based on a Type 2A channel access procedure. For example, if an LBT for a first starting symbol / position fails based on a Type 2A channel access procedure, a channel access attempt at a second starting symbol / position is made based on a Type 2A channel access procedure. For example, if an LBT for a first starting symbol / position fails based on a Type 1 channel access procedure and a channel access attempt is made at a second starting symbol / position, the ongoing Type 1 channel access procedure is interrupted and a new Type 1 channel access procedure is performed again.

[0267] In the embodiments of the present disclosure, various methods may be applied differently depending on the CAPC value and / or the SL priority value and / or the (remaining) counter value of the Type 1 channel access procedure and / or the contention window size of the Type 1 channel access procedure.

[0268] On the other hand, as part of the method of having multiple starting symbols for the PSCCH / PSSCH, multiple PSCCH / PSSCH resources within one slot are generated along the time axis. For example, 14 or 12 symbols within a slot are divided into 7 or 6 symbols to secure two PSCCH / PSSCH resources within the slot. On the other hand, in the above structure, the PSSCH DMRS pattern is limited to the case where the number of DMRS symbols is two, and even in this case, part of the first DMRS is punctured by the PSCCH transmission. Also, in the above structure, PSFCH resources are not allocated, which may prevent SL HARQ-ACK-based operation.

[0269] For example, when a slot has multiple PSCCH / PSSCH time resources, one PSSCH DMRS symbol may be allowed for each PSCCH / PSSCH resource. For example, the PSSCH DMRS symbol may be mapped next to 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, the first half of the symbols included in the slot may be assigned to PSCCH / PSSCH resources, and the second half may be assigned to one or more PSFCH resources. For example, in the above method of mapping multiple PSFCH resources to half of the slot, a PSFCH consisting of two symbols may be concatenated consecutively without a gap, and all or part of the last symbol may be a TX-RX switching symbol. For example, the first half of the symbols included in the slot may be assigned to one or more PSFCH resources, and the second half may be assigned to PSCCH / PSSCH resources. For example, the location of the PSFCH resources within the slot may be configured (in advance) for each resource pool.

[0270] On the other hand, after determining that an LBT has failed, the UE may not have enough time to switch back to SL reception operation in the time interval where SL transmission is scheduled. For example, if the UE fails the LBT for a sidelink transmission resource, the UE may omit sidelink reception operation in a time resource (e.g., a slot) for the transmission resource. For example, if the UE omits sidelink reception operation after the LBT failure, when the UE performs Mode 2 resource (re)selection, the UE may designate a slot in which the actual sidelink transmission is not performed as a non-monitored slot. For example, for the non-monitored slot in the sensing window, the UE may exclude from available resources all resources in slot(s) in the resource selection window derived from each candidate resource reservation periodicity value (pre-set) in the resource pool from the non-monitored slot. For example, if the UE fails the LBT for a sidelink transmission resource for a first starting position, the UE may omit sidelink reception for the first starting position and / or attempt sidelink reception for a second starting position. For example, if the terminal fails the LBT for a sidelink transmission resource, the terminal may omit the sidelink reception operation for a part of the time interval of the time resource (e.g., slot) for the transmission resource, and may perform the reception operation for the subsequent time intervals. For example, the part of the time interval may be limited to within the CP length. For example, the part of the time interval may be limited to the first symbol available for the sidelink or PSCCH / PSSCH.

[0271] On the other hand, for transmission within a single RB set, the CP extension method may differ depending on whether all PRBs in the RB set are used for transmission or not.

[0272] For example, when a terminal performs transmission for all PRBs in an RB set, the terminal may determine the CP extension method and / or CP extension length differently depending on the CAPC or SL priority value, and / or the terminal may randomly select or determine the CP extension method and / or CP extension length from candidate values ​​of CP extension length (pre-set) by resource pool and / or by inside or outside the COT and / or by CAPC or SL priority.

[0273] For example, CPE start position candidate locations (i.e., CPE length candidate values) are configured (in advance) in the terminal according to the priority of SL transmission (e.g., PSCCH / PSSCH transmission). For example, CPE start position candidate locations (i.e., CPE length candidate values) are configured (in advance) in the terminal according to the priority of SL transmission (e.g., PSCCH / PSSCH transmission) for each resource pool. In this case, for example, the terminal may determine a CPE start position candidate location associated with the priority of SL transmission from among the CPE start position candidate locations configured (in advance) according to the priority of SL transmission, and the terminal may randomly select a CPE start position candidate location from among the CPE start position candidate locations associated with the priority of SL transmission. Table 25 shows an example of a set of CPE start position candidate locations configured (in advance) according to priority.

[0274] [Table 25]

[0275] For example, referring to Table 25, CPE start position candidate locations (i.e., CPE length candidate values) can be set (in advance) according to the priority of SL transmission (e.g., PSCCH / PSSCH transmission). For example, if the terminal is to perform SL transmission with priority 3, the terminal can randomly select a CPE start position candidate location from the set of CPE start position candidate locations {C1, C2, ...}. For example, if the terminal is to perform SL transmission with priority 1, the terminal can randomly select a CPE start position candidate location from the set of CPE start position candidate locations {A1, A2, ...}. For example, the set of CPE start position candidate locations can be a set of index values ​​for CPE candidates.

[0276] Furthermore, for example, CPE start position candidates (i.e., CPE length candidate values) that can be used for SL transmission inside the COT and CPE start position candidates (i.e., CPE length candidate values) that can be used for SL transmission outside the COT can be separately (pre-configured) in the UE. For example, CPE start position candidates (i.e., CPE length candidate values) that can be used for SL transmission inside the COT and CPE start position candidates (i.e., CPE length candidate values) that can be used for SL transmission outside the COT can be separately (pre-configured) in the UE for each resource pool. In this case, for example, the UE can determine a CPE start position candidate associated with the priority of SL transmission from among CPE start position candidates (pre-configured) for the inside of the COT or outside the COT according to the priority of SL transmission, and the UE can randomly select a CPE start position candidate from among the CPE start position candidate associated with the priority of SL transmission. Table 26 shows an example of a set of CPE start position candidates (pre-configured) for the inside of the COT or outside the COT and according to priority.

[0277] [Table 26]

[0278] For example, referring to Table 26, CPE start position candidate locations (i.e., CPE length candidate values) can be set (in advance) according to whether the COT is inside or outside the COT and according to the priority of SL transmission (e.g., PSCCH / PSSCH transmission). For example, if the UE intends to perform SL transmission with priority 3 within the COT, the UE can randomly select a CPE start position candidate from the set of CPE start position candidate locations {COT_IN_C1, COT_IN_C2,...}. For example, if the UE intends to perform SL transmission with priority 1 outside the COT, the UE can randomly select a CPE start position candidate from the set of CPE start position candidate locations {COT_OUT_A1, COT_OUT_A2,...}. For example, the set of CPE start position candidate locations can be a set of index values ​​for CPE candidates.

[0279] In the above-described embodiment, the indexes for all CPE candidate values ​​are 0, 1, . . . , M-1, and the M value and its candidate values ​​may differ depending on the SCS.

[0280] For example, a set of CPE candidates used outside the COT that is (pre)configured in the terminal may include at least one of an index value for a default CPE, a set of index values ​​for CPE candidates for SL priority value 1, a set of index values ​​for CPE candidates for SL priority value 2, a set of index values ​​for CPE candidates for SL priority value 3, a set of index values ​​for CPE candidates for SL priority value 4, a set of index values ​​for CPE candidates for SL priority value 5, a set of index values ​​for CPE candidates for SL priority value 6, a set of index values ​​for CPE candidates for SL priority value 7, and / or a set of index values ​​for CPE candidates for SL priority value 8. For example, CPE candidate values ​​are set to 0, 1, 3 for SL priority j, and CPE candidate values ​​are set to 3, 4, 5 for SL priority i. For example, CPE candidate values ​​are set to 0, 1, 4 for SL priority j, and CPE candidate values ​​are set to 5, 6, 7 for SL priority i. For example, for SL priority j, the CPE candidate values ​​are set to 0, 1, 2, 3, 4, 5, 6, 7, and for SL priority i, the CPE candidate values ​​are set to 0, 1, 2, 3, 4, 5, 6, 7. For example, for SL priority j, the CPE candidate value is set to 0, and for SL priority i, the CPE candidate value is set to 1.

[0281] For example, the set of CPE candidates used within the COT (pre-)configured in the terminal may include at least one of an index value for a default CPE, a set of index values ​​for CPE candidates for SL priority value 1, a set of index values ​​for CPE candidates for SL priority value 2, a set of index values ​​for CPE candidates for SL priority value 3, a set of index values ​​for CPE candidates for SL priority value 4, a set of index values ​​for CPE candidates for SL priority value 5, a set of index values ​​for CPE candidates for SL priority value 6, a set of index values ​​for CPE candidates for SL priority value 7, and / or a set of index values ​​for CPE candidates for SL priority value 8.

[0282] For example, a set of CPE candidates used outside the COT that is (pre)configured in the terminal may include at least one of an index value or an M-sized bitmap for a default CPE (only one 1 (at most) is allowed in the bitmap for the default CPE), an M-sized bitmap for SL priority value 1, an M-sized bitmap for SL priority value 2, an M-sized bitmap for SL priority value 3, an M-sized bitmap for SL priority value 4, an M-sized bitmap for SL priority value 5, an M-sized bitmap for SL priority value 6, an M-sized bitmap for SL priority value 7, and / or an M-sized bitmap for SL priority value 8. For example, each entry in the bitmap may be associated with a CPE candidate value in order, and a CPE candidate value set to 1 is included in the set of CPE candidate values ​​for the SL priority value.

[0283] For example, a set of CPE candidates used within a COT (pre-configured in a terminal) may include at least one of an index value or an M-sized bitmap for a default CPE (only one 1 is allowed in the bitmap for the default CPE (at most), an M-sized bitmap for an SL priority value of 1, an M-sized bitmap for an SL priority value of 2, an M-sized bitmap for an SL priority value of 3, an M-sized bitmap for an SL priority value of 4, an M-sized bitmap for an SL priority value of 5, an M-sized bitmap for an SL priority value of 6, an M-sized bitmap for an SL priority value of 7, and / or an M-sized bitmap for an SL priority value of 8. For example, each entry in the bitmap may be associated with a CPE candidate value in order, and a CPE candidate value set to 1 is included in the set of CPE candidate values ​​for the SL priority value.

[0284] For example, if a terminal is in a part of the RB set, When transmitting on a PRB, the UE can use a CP extension length that is (pre)configured for each resource pool and / or for each resource pool inside or outside the COT and / or for each CAPC or SL priority. On the other hand, the UE can transmit on multiple RB sets, and in this case, it needs to determine a method for performing CP extension. For example, when the UE transmits on resources in multiple RB sets, and / or when the UE uses all PRBs in a specific RB set for transmission, and / or when the UE uses some PRBs in a specific RB set for transmission, the CP extension method and length used when the UE transmits on all assigned RB sets may be the CP extension method and length when the UE uses all PRBs in the RB set. For example, when a terminal performs transmission over resources in multiple RB sets, and / or when the terminal uses all PRBs in a specific RB set for transmission and / or when the terminal uses some PRBs in a specific RB set for transmission, the CP extension method and length used by the terminal when performing transmission over all assigned RB sets may be the CP extension method and length for when the terminal uses some PRBs in the RB set. For example, when a terminal performs transmission over resources in multiple RB sets, and / or when the terminal uses all PRBs in a specific RB set for transmission and / or when the terminal uses some PRBs in a specific RB set for transmission, the CP extension method and length used by the terminal when performing transmission over all assigned RB sets may be the longer of the CP extension methods and lengths derived by the terminal in different ways.For example, when a terminal performs transmissions on resources in multiple RB sets, and / or when the terminal uses all PRBs in a specific RB set for transmission and / or when the terminal uses some PRBs in a specific RB set for transmission, the CP extension method and length used by the terminal when performing transmissions on all assigned RB sets may be the shorter of the CP extension methods and lengths derived by the terminal in different manners. For example, when a terminal performs transmissions on resources in multiple RB sets, and / or when the terminal uses all PRBs in a specific RB set for transmission and / or when the terminal uses some PRBs in a specific RB set for transmission, the CP extension method and length used by the terminal when performing transmissions on all assigned RB sets may be the average of the CP extension methods and lengths derived by the terminal in different manners. For example, when a terminal transmits to resources in multiple RB sets, and / or when the terminal uses all PRBs in a specific RB set for transmission and / or when the terminal uses some PRBs in a specific RB set for transmission, the CP extension method and length used by the terminal when transmitting to all assigned RB sets may be a value separately (pre-configured) by the terminal. For example, when a terminal transmits to resources in multiple RB sets, and / or when the terminal uses a single CP extension length in a slot for a specific RB set, and / or when the terminal selects and uses one of multiple CP extension lengths in a slot for a specific RB set, the CP extension method and length used by the terminal when transmitting to all assigned RB sets may be the same as when the terminal uses a single CP extension length in a slot.For example, if a terminal performs transmission on resources in multiple RB sets, and / or if the terminal uses a single CP extension length in a slot for a specific RB set, and / or if the terminal selects and uses one of multiple CP extension lengths in a slot for a specific RB set, the CP extension method and length used by the terminal when performing transmission on all assigned RB sets may be the same as when the terminal selects and uses one of multiple CP extension lengths in a slot. For example, if a terminal performs transmission on resources in multiple RB sets, and / or if the terminal uses a single CP extension length in a slot for a specific RB set, and / or if the terminal selects and uses one of multiple CP extension lengths in a slot for a specific RB set, the CP extension method and length used by the terminal when performing transmission on all assigned RB sets may be the longer of the CP extension methods and lengths derived by the terminal in different ways. For example, if a terminal performs transmission on resources in multiple RB sets, and / or if the terminal uses a single CP extension length in a slot for a specific RB set, and / or if the terminal selects and uses one of multiple CP extension lengths in a slot for a specific RB set, the CP extension method and length used by the terminal when performing transmission on all assigned RB sets may be the shorter of the CP extension methods and lengths derived by the terminal in different ways.For example, if a terminal performs transmission on resources in multiple RB sets, and / or if the terminal uses a single CP extension length in a slot for a specific RB set, and / or if the terminal selects and uses one of multiple CP extension lengths in a slot for a specific RB set, the CP extension method and length used by the terminal when performing transmission on all assigned RB sets may be the average of the CP extension methods and lengths derived by the terminal in different ways. The reason for this is that if the frequency domain used for transmission varies over time, a transient period may occur during the time interval, which may cause signal distortion.

[0285] For example, when a terminal transmits using resources of multiple RB sets, a CP extension method and / or length may be determined and applied differently for each RB set.

[0286] In an embodiment of the present disclosure, an LBT failure may be limited to a channel access procedure of type 2 sequence. In an embodiment of the present disclosure, an LBT failure may be limited to a time interval between the start of the transmission resource corresponding to the LBT or the start of the transmission resource and the time when the LBT failure is determined to be below a certain level.

[0287] In an embodiment of the present disclosure, puncturing of a specific symbol may be limited to within a CP. In an embodiment of the present disclosure, puncturing of a specific symbol may be limited to an interval outside the time interval for actually performing AGC. In an embodiment of the present disclosure, whether or not to puncture a part or all of a CP and / or the method thereof may replace or extend the length of the punctured interval. For example, whether or not to puncture a part or all of a CP and / or the length of the punctured interval may be set (in advance) for each resource pool, each SL channel, each COT inside or outside, each CAPC value, each SL priority value, each CBR range, and / or each channel access type. For example, whether or not to puncture all or part of the CP and / or the length of the punctured interval may vary by resource pool and / or by SL channel and / or inside or outside the COT and / or by CAPC value and / or by SL priority value.

[0288] For example, if the terminal fails the LBT for the previous symbol start position, and / or if the terminal is unable to complete the LBT operation, and / or if the transmission for the previous symbol start position is dropped due to a prioritization process and / or congestion control, etc., the terminal can change the (next) symbol start position for the PSCCH / PSSCH.

[0289] In embodiments of the present disclosure, omitting all or part of a CP for sidelink transmission and / or reception may be applied differently depending on the target distance of sidelink communication. For example, if the target distance of sidelink communication is equal to or greater than a certain level, omitting part of a CP may not be permitted and / or the length of the period during which CP omission is possible may be differently (pre-set).

[0290] In various embodiments of the present disclosure, the method may be applied differently for each SL channel and / or depending on whether PSCCH / PSSCH transmission by the terminal is COT external or internal acknowledgement, etc.

[0291] In various embodiments of the present disclosure, the method may be applied differently for each SCS and / or each RB set and / or each RB set size.

[0292] For example, a setting that allows multiple symbol start positions for a sidelink channel (PSCCH / PSSCH) and / or a setting that adjusts the start position through CPE or CP puncturing may be used simultaneously. For example, the multiple symbol start positions may differ in whether CPE or CP puncturing is possible and / or may have different length candidates for CPE or CP puncturing. For example, even if CPE is applied to the first symbol start position, the UE does not apply CPE when attempting transmission for the next symbol start position. For example, if the UE attempts LBT for the first or previous symbol start position, and / or if the LBT result is busy, and / or if the UE switches to a receiving operation after canceling transmission for the first or previous symbol start position, and / or if the UE detects another UE's SCI during the receiving operation, and / or if the PSSCH resource corresponding to the detected SCI overlaps with the UE's transmission resource for the next symbol start position, the UE may not attempt transmission for the next symbol start position and / or may omit CPE application when transmitting for the next symbol start position. For example, the CPE or CP puncturing and length are the same depending on the symbol start positions for the UE's PSCCH / PSSCH transmission. For example, if the UE selected the CPE length for the previous symbol start according to CAPC or SL priority and / or randomly, and if the UE attempts to transmit for the next symbol start, the UE can use the CPE length selected according to CAPC or SL priority and / or randomly as is.

[0293] For example, a terminal may not expect to simultaneously use a setting that allows multiple symbol start positions for the sidelink channel (PSCCH / PSSCH) and / or a setting that adjusts the start position via CPE or CP puncturing.

[0294] 16 illustrates a method for a first device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 16 can be combined with various embodiments of the present disclosure.

[0295] Referring to FIG. 16, in step S1610, a first device may acquire information related to a default CPE (cyclic prefix extension) starting position. In step S1620, the first device may acquire information related to a plurality of CPE starting candidate positions. In step S1630, the first device may select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to a resource for SL (sidelink) transmission is detected or whether a resource reservation is transmitted. In step S1640, the first device may perform the SL transmission based on the selected CPE starting position.

[0296] For example, the SL transmission may include a physical sidelink control channel (PSCCH) transmission and a physical sidelink shared channel (PSSCH) transmission.

[0297] For example, the resource may include at least one of a slot or a set of resource blocks (RBs).

[0298] For example, the selected CPE start location may be the default CPE start location based on detecting the resource reservation associated with the resource for the SL transmission.

[0299] For example, the selected CPE start location may be the default CPE start location based on which the resource reservation associated with the resource for the SL transmission is transmitted.

[0300] For example, information relating to the default CPE starting location may be configured or pre-configured for the first device.

[0301] For example, the CPE start location may be randomly selected from the plurality of CPE start location candidates based on the resource reservation associated with the resource for the SL transmission not being detected or based on the resource reservation associated with the resource for the SL transmission not being transmitted. For example, the CPE start location may be randomly selected from the plurality of CPE start location candidates based on the resource reservation associated with the resource for the SL transmission not being detected and based on the resource reservation associated with the resource for the SL transmission not being transmitted. For example, the CPE start location may be randomly selected by the first device from at least one CPE start location candidate associated with a priority of the SL transmission among the plurality of CPE start location candidates. For example, the priority may be a priority included in sidelink control information (SCI) associated with the SL transmission.

[0302] For example, the CPE may be executed by the first device in a time interval from the CPE starting position to before the SL transmission.

[0303] For example, one or more CPE start position candidates used within a channel occupancy time (COT) and one or more CPE start position candidates used outside the COT can be set separately for each resource pool.

[0304] For example, the plurality of CPE origination locations may include one or more CPE origination locations used within a channel occupancy time (COT) and one or more CPE origination locations used outside the COT. For example, based on the SL transmission being outside the COT, the CPE origination location may be randomly selected by the first device from among the one or more CPE origination locations used outside the COT, at least one CPE origination location associated with a priority of the SL transmission.

[0305] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 102 of the first device 100 can acquire information related to a default CPE (cyclic prefix extension) starting position. Then, the processor 102 of the first device 100 can acquire information related to a plurality of CPE starting candidate positions. Then, the processor 102 of the first device 100 can select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to a resource for sidelink (SL) transmission is detected or whether a resource reservation is transmitted. Then, the processor 102 of the first device 100 can control the transceiver 106 to perform the SL transmission based on the selected CPE starting position.

[0306] According to an embodiment of the present disclosure, there is provided a first device configured to perform wireless communication. For example, the first device may include at least one transceiver; at least one processor; and at least one memory coupled 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: acquire information related to a default cyclic prefix extension (CPE) starting position; acquire information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position.

[0307] According to an embodiment of the present disclosure, there is provided a processing device configured to control a first device. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions. For example, the instructions, when executed by the at least one processor, may cause the first device to: acquire information related to a default cyclic prefix extension (CPE) starting position; acquire information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position.

[0308] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions may, for example, be configured to cause a first device to: acquire information related to a default cyclic prefix extension (CPE) starting position; acquire information related to a plurality of CPE starting candidate positions; select a CPE starting position from the default CPE starting position or the plurality of CPE starting candidate positions based on whether a resource reservation related to resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted; and perform the SL transmission based on the selected CPE starting position.

[0309] 17 illustrates a method for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 17 can be combined with various embodiments of the present disclosure.

[0310] 17, in step S1710, a second device may receive a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from a first device via a physical sidelink control channel (PSCCH). In step S1720, the second device may receive the second SCI from the first device via the PSSCH. For example, a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH may be selected from a default CPE starting position or multiple CPE starting candidate positions based on whether a resource reservation associated with resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted.

[0311] The proposed method can be applied to devices according to various embodiments of the present disclosure. First, the processor 202 of the second device 200 can control the transceiver 206 to receive a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from the first device via a physical sidelink control channel (PSCCH). Then, the processor 202 of the second device 200 can control the transceiver 206 to receive the second SCI from the first device via the PSSCH. For example, a cyclic prefix extension (CPE) starting position associated with the PSCCH and the PSSCH can be selected from a default CPE starting position or multiple CPE starting candidate positions based on whether a resource reservation associated with resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted.

[0312] According to an embodiment of the present disclosure, there is provided a second device configured to perform wireless communication. For example, the second device may include at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and storing instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: receive, from a first device via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receive, from the first device via the PSSCH, the second SCI. For example, a cyclic prefix extension (CPE) starting position associated with the PSCCH and the PSSCH may be selected from a default CPE starting position or multiple CPE starting candidate positions based on whether a resource reservation associated with resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted.

[0313] According to an embodiment of the present disclosure, there is provided a processing device configured to control a second device. For example, the processing device may include at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions. For example, the instructions, when executed by the at least one processor, may cause the second device to: receive, from a first device via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receive, from the first device via the PSSCH, the second SCI. For example, a cyclic prefix extension (CPE) starting position associated with the PSCCH and the PSSCH may be selected from a default CPE starting position or multiple CPE starting candidate positions based on whether a resource reservation associated with resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted.

[0314] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having instructions recorded thereon is provided. For example, the instructions, when executed, may cause a second device to: receive from a first device, via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receive from the first device, via the PSSCH, the second SCI. For example, a cyclic prefix extension (CPE) starting position associated with the PSCCH and the PSSCH may be selected from a default CPE starting position or multiple CPE starting candidate positions based on whether a resource reservation associated with resources for sidelink (SL) transmission is detected or whether a resource reservation is transmitted.

[0315] According to various embodiments of the present disclosure, if a resource reservation is detected or transmitted for resources (e.g., RB set(s) and slots) of the intended PSCCH / PSSCH transmission, the terminal may select a default CPE starting position configured (in advance) for the PSCCH / PSSCH transmission. Otherwise, the terminal may randomly select a CPE starting position from one or more candidate CPE starting positions configured (in advance) according to the priority of the PSCCH / PSSCH transmission for the PSCCH / PSSCH transmission. This can prevent the problem of channel occupancy failure due to CPEs between different devices and improve the performance of SL communication in unlicensed bands.

[0316] The various embodiments of the present disclosure may be intercombined.

[0317] An apparatus to which various embodiments of the present disclosure are applied will be described below.

[0318] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or operational flow diagrams disclosed in this document may be applied to various fields requiring wireless communication / connection between devices (e.g., 5G).

[0319] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the following drawings and description, unless otherwise specified, the same reference numerals in the same drawings may represent the same or corresponding hardware blocks, software blocks, or function blocks.

[0320] 18 illustrates a communication system 1 according to one embodiment of the present disclosure. The embodiment of FIG. 18 can be combined with various embodiments of the present disclosure.

[0321] 18 , a communication system 1 to which various embodiments of the present disclosure are applied includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that perform communication using wireless connection technologies (e.g., 5G New RAT (NR) or Long Term Evolution (LTE)) and are referred to as communication / wireless / 5G devices. Without being limited thereto, the wireless devices may include a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI device / server 400. For example, the vehicles may include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of performing inter-vehicle communication, etc. Here, the vehicles may include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and may be embodied in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) installed in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance, digital signage, a vehicle, a robot, etc. Mobile devices may include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebooks, etc.), etc. Home appliances may include TVs, refrigerators, washing machines, etc. IoT devices may include sensors, smart meters, etc. For example, a base station or network may be embodied as a wireless device, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0322] Here, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NIT) for low-power communication. Here, for example, NB-IoT technology is an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the above-mentioned names. Furthermore, or generally, the wireless communication technology implemented in the wireless devices 100a to 100f in this specification may perform communication based on LTE-M technology. Here, for example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced Machine Type Communication (eMTC). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above-mentioned names. Additionally, or generally, the wireless communication technology implemented in wireless devices 100a-100f herein may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN), which are considered low-power communications, but are not limited to the above names. As an example, ZigBee technology is based on various standards, such as IEEE 802.15.4, and can create personal area networks (PANs) related to small / low-power digital communications, and is referred to by various names.

[0323] The wireless devices 100a to 100f may be connected to a network 300 via a base station 200. Artificial Intelligence (AI) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to an 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. The wireless devices 100a to 100f may communicate with each other via the base station 200 / network 300, or may communicate directly with each other (e.g., sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may communicate directly with each other (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). Furthermore, an IoT device (for example, a sensor) can directly communicate with another IoT device (for example, a sensor) or another wireless device 100a to 100f.

[0324] Wireless communications / connections 150a, 150b, and 150c can be established between the wireless devices 100a to 100f and the base station 200, and between the base stations 200. Here, the wireless communication / connections may be performed via various wireless connection technologies (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)). Through the wireless communication / connections 150a, 150b, and 150c, wireless devices and base stations, and base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals of the present disclosure, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), resource allocation processes, etc. may be performed.

[0325] 19 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 19 can be combined with various embodiments of the present disclosure.

[0326] 19, a first wireless device 100 and a second wireless device 200 may transmit and receive wireless signals via various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} may correspond to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0327] The first wireless device 100 includes 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 processor 102 may be configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate first information / signal and then transmit a wireless signal including the first information / signal via the transceiver 106. The processor 102 may also receive a wireless signal including second information / signal via the transceiver 106 and then store information obtained from signal processing of the second information / signal in the memory 104. The memory 104 may be coupled to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may store software code including instructions for executing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 102 and the memory 104 are part of a communications modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 may be coupled to the processor 102 and may transmit and / or receive wireless signals via one or more antennas 108. The transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be referred to as a radio frequency (RF) unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0328] The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may be configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information / signal and then transmit a wireless signal including the third information / signal via the transceiver 206. The processor 202 may also receive a wireless signal including fourth information / signal via the transceiver 206 and then store information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 may be coupled to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 may store software code including instructions for executing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. Here, the processor 202 and the memory 204 are part of a communications modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 may be coupled to the processor 202 and may transmit and / or receive wireless signals via one or more antennas 208. The transceiver 206 may include a transmitter and / or a receiver and may be referred to as an RF unit. In this disclosure, a wireless device may also refer to a communications modem / circuit / chip.

[0329] The hardware elements of the wireless devices 100, 200 will be described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information in accordance with the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein. The one or more processors 102, 202 can generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 can receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or operational flow diagrams disclosed herein.

[0330] The one or more processors 102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. For example, one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software configured to be executed by one or more processors 102, 202, or stored in one or more memories 104, 204 and run by one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions, and / or collections of instructions.

[0331] One or more memories 104, 204 may be coupled to one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may comprise ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. The one or more memories 104, 204 may also be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0332] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or operational flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or operational flowcharts disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 may be coupled to one or more antennas 108, 208 and configured to transmit and receive user data, control information, radio signals / channels, etc., referred to in the descriptions, functions, procedures, suggestions, methods, and / or operational flowcharts disclosed herein via one or more antennas 108, 208. In this document, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106, 206 may convert received radio signals / channels, etc., from RF band signals to baseband signals for processing using one or more processors 102, 202. One or more transceivers 106, 206 may convert user data, control information, radio signals / channels, etc., processed using one or more processors 102, 202, from baseband signals to RF band signals. To this end, one or more transceivers 106, 206 may include an (analog) oscillator and / or a filter.

[0333] 20 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 20 can be combined with various embodiments of the present disclosure.

[0334] 20, 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. Without being limited thereto, the operations / functions of FIG. 20 may be performed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 19. The hardware elements of FIG. 20 may be embodied in the processors 102, 202 and / or the transceivers 106, 206 of FIG. 19. For example, the blocks 1010 to 1060 may be embodied in the processors 102, 202 of FIG. 19. Furthermore, the blocks 1010 to 1050 may be embodied in the processors 102, 202 of FIG. 19, and the block 1060 may be embodied in the transceivers 106, 206 of FIG. 19.

[0335] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 20. Here, the codeword is an encoded bit sequence of an information block. The information block can include a transmission block (e.g., a UL-SCH transmission block, a DL-SCH transmission block). The radio signal can be transmitted via various physical channels (e.g., a PUSCH, a PDSCH).

[0336] Specifically, the codeword may be converted into a scrambled bit sequence by the scrambler 1010. The scrambling sequence used for scrambling may be generated based on an initialization value, which may include ID information of the wireless device. The scrambled bit sequence may be modulated into a modulation symbol sequence by the modulator 1020. Modulation schemes may include pi / 2-Binary Phase Shift Keying (pi / 2-BPSK), m-Phase Shift Keying (m-PSK), m-Quadrature Amplitude Modulation (m-QAM), etc. The complex modulation symbol sequence may be mapped to one or more transmission layers by the layer mapper 1030. The modulation symbols of each transmission layer may be mapped to corresponding antenna port(s) by the precoder 1040 (precoding). The output z of the precoder 1040 is obtained by multiplying the output y of the layer mapper 1030 by an N*M precoding matrix W. Here, N is the number of antenna ports, and M is the number of transmission layers. Here, the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) on complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

[0337] The resource mapper 1050 can map modulation symbols for each antenna port to time-frequency resources. The time-frequency resources can include multiple symbols (e.g., CP-OFDMA symbols, DFT-s-OFDMA symbols) in the time domain and multiple subcarriers in the frequency domain. The signal generator 1060 generates wireless signals from the mapped modulation symbols, and the generated wireless signals can be transmitted to other devices via each antenna. To this end, the signal generator 1060 can include an inverse fast fourier Transform (IFFT) module, a cyclic prefix (CP) inserter, a digital-to-analog converter (DAC), a frequency uplink converter, etc.

[0338] In a wireless device, the signal processing process for a received signal may be configured as the inverse of the signal processing processes 1010 to 1060 in FIG. 20. For example, a wireless device (e.g., 100 or 200 in FIG. 19) may receive a wireless signal from the outside through an antenna port / transceiver. The received wireless signal may be converted to 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. Thereafter, the baseband signal may be restored to a codeword through a resource demapper process, a postcoding process, a demodulation process, and a descrambling process. The codeword may be restored to the original information block through decoding. Therefore, a signal processing circuit (not shown) for the received signal may include a signal restorer, a resource demapper, a postcoder, a demodulator, a descrambler, and a decoder.

[0339] 21 illustrates a wireless device according to an embodiment of the present disclosure. The wireless device may be implemented in various forms depending on the use case / service (see FIG. 18). The embodiment of FIG. 21 may be combined with various embodiments of the present disclosure.

[0340] 21, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 19 and may be configured with various elements, components, units, and / or modules. For example, the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 17. For example, the transceiver(s) 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 19. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional elements 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 the programs / codes / instructions / information stored in the memory unit 130. In addition, the control unit 120 can transmit information stored in the memory unit 130 to an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or can store information received from an external device (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0341] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Without being limited thereto, the wireless device may be embodied in the form of a robot (100a in FIG. 18), a vehicle (100b-1, 100b-2 in FIG. 18), an XR device (100c in FIG. 18), a mobile device (100d in FIG. 18), a home appliance (100e in FIG. 18), an IoT device (100f in FIG. 18), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a FinTech device (or a financial device), a security device, a climate / environment device, an AI server / device (400 in FIG. 18), a base station (200 in FIG. 18), a network node, etc. The wireless device may be mobile or fixed depending on the use case / service.

[0342] 21, various elements, components, units / parts, and / or modules within the wireless devices 100 and 200 may be interconnected entirely via a wired interface, or at least some of them may be connected wirelessly via the communication unit 110. For example, within the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected via a wired interface, and the control unit 120 and a first unit (e.g., 130, 140) may be connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part, and / or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured as a set of one or more processors. For example, the control unit 120 may be configured as a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of 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.

[0343] The embodiment of FIG. 21 will now be described in more detail with reference to other drawings.

[0344] FIG. 22 illustrates a mobile device according to one embodiment of the present disclosure. The mobile device may include a smartphone, a smart pad, a wearable device (e.g., a smart watch, smart glasses), or a portable computer (e.g., a laptop). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT). The embodiment of FIG. 22 may be combined with various embodiments of the present disclosure.

[0345] 22, portable device 100 may include antenna unit 108, communication unit 110, control unit 120, memory unit 130, power supply unit 140a, interface unit 140b, and input / output unit 140c. Antenna unit 108 may be configured as part of communication unit 110. Blocks 110 to 130 / 140a to 140c correspond to blocks 110 to 130 / 140 in FIG. 21, respectively.

[0346] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from other wireless devices and base stations. The control unit 120 can control the components of the portable device 100 and perform various operations. The control unit 120 can include an AP (Application Processor). The memory unit 130 can store data, parameters, programs, codes, and instructions required to operate the portable device 100. The memory unit 130 can also store input / output data / information. The power supply unit 140a supplies power to the portable device 100 and can include a wired / wireless charging circuit, a battery, etc. The interface unit 140b can support connection between the portable device 100 and other external devices. The interface unit 140b can include various ports (e.g., audio input / output ports, video input / output ports) for connection with external devices. The input / output unit 140c can receive and output video information / signals, audio information / signals, data, and / or information input by a user. The input / output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and / or a haptic module.

[0347] For example, in the case of data communication, the input / output unit 140c may acquire information / signals (e.g., touch, text, voice, image, video) input by a user, and the acquired information / signals may be stored in the memory unit 130. The communication unit 110 may convert the information / signals stored in the memory into wireless signals and transmit the converted wireless signals directly to another wireless device or to a base station. The communication unit 110 may also receive wireless signals from another wireless device or a base station and restore the received wireless signals to the original information / signals. The restored information / signals may be stored in the memory unit 130 and then output in various forms (e.g., text, voice, image, video, haptic) via the input / output unit 140c.

[0348] 23 illustrates a vehicle or an autonomous vehicle according to an embodiment of the present disclosure. The vehicle or autonomous vehicle may be a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc. The embodiment of FIG. 23 may be combined with various embodiments of the present disclosure.

[0349] 23, a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 21, respectively.

[0350] The communication unit 110 can transmit and receive signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 can control elements of the vehicle or autonomous vehicle 100 and perform various operations. The control unit 120 can include an ECU (Electronic Control Unit). The driving unit 140a can cause the vehicle or autonomous vehicle 100 to travel on the ground. The driving unit 140a can include an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and can include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane while driving, a technology for automatically adjusting speed like adaptive cruise control, a technology for automatically driving along a predetermined route, a technology for automatically setting a route and driving when a destination is set, etc.

[0351] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The control unit 120 may control the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. During autonomous driving, the communication unit 110 may non-periodically acquire the latest traffic information data from an external server and acquire surrounding traffic information data from surrounding vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data / information. The communication unit 110 may transmit information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server may predict traffic information data in advance using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0352] The claims described herein may be combined in various ways. For example, technical features of method claims herein may be combined and embodied in an apparatus, and technical features of apparatus claims herein may be combined and embodied in a method. Furthermore, technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in an apparatus, and technical features of method claims herein and technical features of apparatus claims herein may be combined and embodied in a method.

[0353] [Claims at the time of international application] [Claim 1] 1. A method of wireless communication by a first device, comprising: obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of CPE start location candidates based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected; and performing the SL transmission based on the selected CPE origination location. [Claim 2] The method of claim 1 , wherein the SL transmissions include a physical sidelink control channel (PSCCH) transmission and a physical sidelink shared channel (PSSCH) transmission. [Claim 3] The method of claim 1 , wherein the resource comprises at least one of a slot or a set of resource blocks (RBs). [Claim 4] The method of claim 1 , wherein the selected CPE start location is the default CPE start location based on the resource reservation being detected for the resource associated with the SL transmission. [Claim 5] The method of claim 1 , wherein the selected CPE start location is the default CPE start location based on which the resource reservation is transmitted for the resource associated with the SL transmission. [Claim 6] The method of claim 1 , wherein the information related to the default CPE starting location is configured or pre-configured for the first device. [Claim 7] 2. The method of claim 1, wherein the CPE start location is randomly selected from the plurality of candidate CPE start locations based on the resource reservation not being transmitted in association with the resource for the SL transmission and based on the resource reservation not being detected in association with the resource for the SL transmission. [Claim 8] The method of claim 7, wherein the CPE start location is randomly selected by the first device from at least one CPE start location candidate associated with a priority of the SL transmission among the plurality of CPE start location candidates. [Claim 9] The method of claim 8, wherein the priority is a priority included in sidelink control information (SCI) associated with the SL transmission. [Claim 10] The method of claim 1 , wherein the CPE is executed by the first device during a time interval from the CPE start position to before the SL transmission. [Claim 11] The method according to claim 1, wherein one or more CPE start position candidates used within a channel occupancy time (COT) and one or more CPE start position candidates used outside the COT are separately configured for each resource pool. [Claim 12] The method of claim 1, wherein the plurality of CPE start candidate locations include one or more CPE start candidate locations used within a channel occupancy time (COT) and one or more CPE start candidate locations used outside the COT. [Claim 13] 13. The method of claim 12, wherein, based on the SL transmission being outside the COT, the CPE start location is randomly selected by the first device from at least one CPE start candidate location associated with a priority of the SL transmission among the one or more CPE start candidate locations used outside the COT. [Claim 14] a first device configured to communicate wirelessly, At least one transmitter / receiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of CPE start location candidates based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected; and performing the SL transmission based on the selected CPE starting location. [Claim 15] a processing device configured to control a first device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an operation; The operation is obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of CPE start location candidates based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected; and performing the SL transmission based on the selected CPE start location. [Claim 16] A non-transitory computer-readable storage medium having instructions recorded thereon, The instructions, when executed, cause the first device to perform an action; The operation is obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of CPE start location candidates based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected; and performing the SL transmission based on the selected CPE start location. [Claim 17] 1. A method of wirelessly communicating by a second device, comprising: receiving, via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receiving the second SCI from the first device via the PSSCH; A method in which a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted for a resource of a SL (sidelink) transmission or whether the resource reservation is detected. [Claim 18] a second device configured to communicate wirelessly, At least one transmitter / receiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an operation; The operation is receiving, via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receiving the second SCI from the first device via the PSSCH; A second device, wherein a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is detected or whether the resource reservation is transmitted for a resource of a SL (sidelink) transmission. [Claim 19] a processing device configured to control a second device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an operation; The operation is receiving, via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receiving the second SCI from the first device via the PSSCH; The PSCCH and the CPE (cyclic prefix extension) starting position associated with the PSSCH are selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted for a resource of SL (sidelink) transmission or whether the resource reservation is detected. A processing device. [Claim 20] A non-transitory computer-readable storage medium having instructions recorded thereon, When executed, the instructions cause a second device to perform an action; The operation is receiving, via a physical sidelink control channel (PSCCH), a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information); and receiving the second SCI from the first device via the PSSCH; A non-transitory computer-readable storage medium, in which a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected.

Claims

1. 1. A method of wireless communication by a first device, comprising: Obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of candidate CPE start locations based on whether a resource reservation is transmitted or detected for resources of a sidelink (SL) transmission; and performing said SL transmission based on said selected CPE starting location.

2. The method of claim 1 , wherein the SL transmissions include a physical sidelink control channel (PSCCH) transmission and a physical sidelink shared channel (PSSCH) transmission.

3. The method of claim 1 , wherein the resource comprises at least one of a slot or a resource block (RB) set.

4. 2. The method of claim 1, wherein the selected CPE start location is the default CPE start location based on the resource reservation being detected for the resource associated with the SL transmission.

5. 2. The method of claim 1, wherein the selected CPE start location is the default CPE start location based on which the resource reservation is transmitted for the resource associated with the SL transmission.

6. The method of claim 1 , wherein the information relating to the default CPE starting location is configured or pre-configured for the first device.

7. 2. The method of claim 1, wherein the CPE start location is randomly selected from the plurality of candidate CPE start locations based on the resource reservation not being transmitted in association with the resource for the SL transmission and based on the resource reservation not being detected in association with the resource for the SL transmission.

8. The method of claim 7 , wherein the CPE origination location is randomly selected by the first device from at least one CPE origination location candidate associated with a priority of the SL transmission among the plurality of CPE origination location candidates.

9. The method of claim 8 , wherein the priority is a priority included in sidelink control information (SCI) associated with the SL transmission.

10. The method of claim 1 , wherein the CPE is executed by the first device during a time interval from the CPE start position to before the SL transmission.

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

12. 2. The method of claim 1, wherein the plurality of CPE start location candidates include one or more CPE start location candidates used within a channel occupancy time (COT) and one or more CPE start location candidates used outside a COT.

13. 13. The method of claim 12, wherein, based on the SL transmission being outside the COT, the CPE start location is randomly selected by the first device from at least one CPE start candidate location associated with a priority of the SL transmission among the one or more CPE start candidate locations used outside the COT.

14. a first device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an action; The operation is Obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of candidate CPE start locations based on whether a resource reservation is transmitted or detected for resources of a sidelink (SL) transmission; and performing the SL transmission based on the selected CPE starting location.

15. a processing device configured to control a first device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the first device to perform an action; The operation is Obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of candidate CPE start locations based on whether a resource reservation is transmitted or detected for resources of a sidelink (SL) transmission; and performing said SL transmission based on said selected CPE starting location.

16. A non-transitory computer-readable storage medium having instructions recorded thereon, the instructions, when executed, cause the first device to perform an action; The operation is Obtaining information related to a default cyclic prefix extension (CPE) starting position; obtaining information relating to a plurality of CPE starting candidate positions; Selecting a CPE start location from the default CPE start location or the plurality of candidate CPE start locations based on whether a resource reservation is transmitted or detected for resources of a sidelink (SL) transmission; and performing the SL transmission based on the selected CPE starting location.

17. 1. A method of wireless communication by a second device, comprising: receiving a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from a first device via a physical sidelink control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH; A method in which a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected.

18. a second device configured to communicate wirelessly, at least one transceiver; at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an action; The operation is receiving a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from a first device via a physical sidelink control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH; A second device, wherein a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is detected or whether the resource reservation is transmitted for a resource of a sidelink (SL) transmission.

19. a processing device configured to control a second device, at least one processor; and at least one memory coupled to the at least one processor and configured to store instructions; the instructions, upon being executed by the at least one processor, cause the second device to perform an action; The operation is receiving a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from a first device via a physical sidelink control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH; The CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted for a resource of a sidelink (SL) transmission or whether the resource reservation is detected.

20. A non-transitory computer-readable storage medium having instructions recorded thereon, When executed, the instructions cause a second device to perform an action; The operation is receiving a first SCI for scheduling a physical sidelink shared channel (PSSCH) and a second SCI (sidelink control information) from a first device via a physical sidelink control channel (PSCCH); and receiving the second SCI from the first device via the PSSCH; A non-transitory computer-readable storage medium, wherein a CPE (cyclic prefix extension) starting position associated with the PSCCH and the PSSCH is selected from a default CPE starting position or a plurality of CPE starting candidate positions based on whether a resource reservation is transmitted or whether the resource reservation is detected for a resource of a sidelink (SL) transmission.

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