NR sidelink transmission method and apparatus with occupied channel bandwidth requirements in unlicensed spectrum

Abstract

A method for operating a first device 100 in a wireless communication system is proposed. The method includes the steps of: determining PSFCH resources for transmission of at least one PSFCH associated with at least one PSSCH, the PSFCH resources including at least one dedicated PRB included in a first interlace and a common interlace, the at least one PSSCH being mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

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] According to an embodiment of the present disclosure, a method for a first device performing wireless communication is provided, for example, the method includes: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH being mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

[0005] According to an embodiment of the present disclosure, there is provided a first device for performing wireless communication. For example, the first device includes at least one transceiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform operations. For example, the operations include: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

[0006] According to an embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal. For example, the apparatus includes at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first terminal to perform operations. For example, the operations include: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

[0007] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions, for example, the instructions, when executed, cause a first device to: determine PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K PRBs included in the at least one dedicated PRB; and perform transmission of the at least one PSFCH based on the PSFCH resources.

[0008] According to an embodiment of the present disclosure, there is provided a method for a second device to perform wireless communication, for example, the method includes: transmitting sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources, wherein the first PSSCH is mapped to the first PRB subset, the first PRB subset includes K PRBs included in at least one dedicated physical resource block (PRB), and the PSFCH resources include the at least one dedicated PRB and a common interlace included in a first interlace.

[0009] According to one embodiment of the present disclosure, there is provided a second device for performing wireless communication, the second device including at least one transceiver, at least one processor, and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform an operation. For example, the operations include: transmitting sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in a physical sidelink feedback channel (PSFCH) resource; wherein the first PSSCH is mapped to the first PRB subset, the first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB), and the PSFCH resource includes the at least one dedicated PRB and a common interlace included in a first interlace. [Brief explanation of the drawings]

[0010] [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 example wireless communication system that supports unlicensed spectrum, according to an example embodiment of the present disclosure. [Figure 11] 1 illustrates a method for occupying resources in an unlicensed spectrum according to one embodiment of the present disclosure. [Figure 12] According to one embodiment of the present disclosure, a case where multiple LBT-SBs are included in the unlicensed band is shown. [Figure 13] 1 illustrates a CAP operation for a base station transmitting a downlink signal over an unlicensed spectrum, according to one embodiment of the present disclosure. [Figure 14] 1 illustrates a Type 1 CAP operation of a terminal for uplink signal transmission according to one embodiment of the present disclosure. [Figure 15] 1 illustrates a structure of a PSFCH resource on an unlicensed band according to one embodiment of the present disclosure. [Figure 16] 1 illustrates a PRB subset to which at least one PSSCH is mapped in an unlicensed band according to one embodiment of the present disclosure. [Figure 17] 10 illustrates a procedure in which a first device performs wireless communication according to an embodiment of the present disclosure. [Figure 18] 10 illustrates a procedure for a second device to perform wireless communication according to an embodiment of the present disclosure. [Figure 19]1 illustrates a communication system 1 according to one embodiment of the present disclosure. [Figure 20] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 21] 1 illustrates a signal processing circuit for a transmit signal according to one embodiment of the present disclosure. [Figure 22] 1 illustrates a wireless device according to one embodiment of the present disclosure. [Figure 23] 1 illustrates a mobile device according to one embodiment of the present disclosure. [Figure 24] 1 illustrates a vehicle or autonomous vehicle according to one embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] 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."

[0012] 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."

[0013] 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."

[0014] 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."

[0015] 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."

[0016] In the following description, "when, if, in case of" may be replaced with "based on."

[0017] In this specification, technical features individually described in one drawing may be embodied individually or simultaneously.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] [Table 1]

[0023] 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.

[0024] 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.

[0025] 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 may 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:

[0026] - 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.

[0027] -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).

[0028] 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.

[0029] -Ubiquitous super 3D connectivity: Connecting drones and very low Earth orbit satellite networks to core network functions will create 6G ubiquitous super 3D connectivity.

[0030] Some common requirements for the characteristics of the new 6G network mentioned above are:

[0031] -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.

[0032] -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.

[0033] 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.

[0034] - 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.

[0035] 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.

[0036] The core implementation technologies of the 6G system are explained below.

[0037] 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. The introduction of 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.

[0038] 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.

[0039] -Large-scale MIMO technology

[0040] -Hologram beam forming (HBF)

[0041] -Optical wireless technology

[0042] -Free Space Optical Transmission Backhaul Network (FSO Backhaul Network)

[0043] -Non-Terrestrial Networks (NTN)

[0044] -Quantum Communication

[0045] -Cell-free Communication

[0046] -Integration of Wireless Information and Power Transmission

[0047] -Integration of Wireless Communication and Sensing

[0048] -Integrated Access and Backhaul Network

[0049] -Big data analysis

[0050] -Reconfigurable Intelligent Surface

[0051] -Metaverse

[0052] -Blockchain

[0053] 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.

[0054] -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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] The functions of the PDCP layer in the user plane include user data transmission, header compression, and ciphering. The functions of the PDCP layer in the control plane include control plane data transmission and encryption / integrity protection.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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).

[0072] 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.

[0073] 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).

[0074] 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).

[0075] 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.

[0076] [Table 2]

[0077] 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.

[0078] 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.

[0079] 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).

[0080] [Table 3]

[0081] 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).

[0082] [Table 4]

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Below, we will explain about BWP (Bandwidth Part) and carrier.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Below, we will explain V2X or SL communication.

[0094] 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.

[0095] 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).

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] In the following, the UE procedure for determining the subset of resources to be reported to higher layers for PSSCH resource selection in sidelink resource allocation mode 2 is described.

[0105] In resource allocation mode 2, higher layers may request the UE to determine a subset of resources from which the higher layers select resources for PSSCH / PSCCH transmission. To trigger this procedure, in slot n, the higher layers provide the following parameters for the PSSCH / PSCCH transmission:

[0106] -The resource pool to which the resource is reported;

[0107] -L1 priority, prio TX ;

[0108] - remaining PDB (packet delay budget);

[0109] - the number L of subchannels used for PSSCH / PSCCH transmission within a slot subCH ;

[0110] Optionally, the resource reservation interval P in msec rsvpTX

[0111] If the higher layer requests the UE to determine a subset of resources to select for PSSCH / PSCCH transmission as part of a re-evaluation or pre-emption procedure, the higher layer provides the resource set (r0, r1, r2, ...) to be re-evaluated and the resource set (r'0, r'1, r'2, ...) to be pre-empted.

[0112] -Slot r i It is up to the UE implementation to determine the subset of resources requested by higher layers before or after "-T3", where r i '' is the slot with the smallest slot index among (r0,r1,r2,...) and (r′0,r′1,r′2,...), and T3 is T SL proc,1 where T SL proc,1 is defined as a slot in table X1, where μ SL This is the SCS configuration for SL BWP.

[0113] The following higher layer parameters affect this procedure:

[0114] -sl-SelectionWindowList:Internal parameter T 2minis a given priority TX For each value, the corresponding value from the upper layer parameter sl-SelectionWindowList is set.

[0115] -sl-Thres-RSRP-List: This upper layer parameter is i , p j ) provides the RSRP threshold for the combination, where p i is the priority field value contained in the received SCI format 1-A, and p j is the priority of transmission on the resource selected by the UE; in this procedure, p j =prio TX is.

[0116] -sl-RS-ForSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurements.

[0117] -sl-ResourceReservePeriodList

[0118] -sl-SensingWindow: The internal parameter T0 is defined as the number of slots corresponding to sl-SensingWindow msec.

[0119] -sl-TxPercentageList: given prio TX The internal parameter X for sl-TxPercentageList(prio TX ) is defined as

[0120] -sl-PreemptionEnable: If sl-PreemptionEnable is provided and not the same as "enabled", the internal parameter prio pre is set to the parameter sl-PreemptionEnable provided by higher layers.

[0121] If the resource reservation interval Prsvp_TX is provided, the resource reservation interval is the logical slot unit P′ in msec. rsvp_TX is converted to

[0122] Notation:

[0123] (t′ SL 0,t′ SL 1,t′ SL 2,...) denotes the set of slots that belong to the sidelink resource pool.

[0124] For example, the UE may select a set of candidate resources (S A For example, when resource (re)selection is triggered, the UE may select a set of candidate resources (S A For example, when re-evaluation or pre-emption is triggered, the UE may select a set of candidate resources (S A ) can be selected.

[0125] [Table 5]

[0126] Meanwhile, partial sensing is supported for UE power saving. For example, in LTE SL or LTE V2X, the UE can perform partial sensing based on Tables 6 and 7.

[0127] [Table 6]

[0128] [Table 7]

[0129] 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, 2 nd -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.

[0130] An example of SCI format 1-A will be described below.

[0131] SCI format 1-A is used for scheduling of the PSSCH and the 2nd-stage SCI on the PSSCH.

[0132] The following information is transmitted using SCI Format 1-A.

[0133] - Priority - 3 bits

[0134] - Frequency resource allocation - When the value of the upper layer parameter sl-MaxNumPerReserve is set to 2, the 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, then ceilinglog2(N SL subChannel (N SL subChannel +1)(2N SL subChannel +1) / 6) bits

[0135] - 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

[0136] -Resource reservation period-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

[0137] -DMRS pattern -ceiling(log2N pattern ) bits, where N pattern is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList

[0138] - 2nd-stage SCI format - 2 bits as defined in Table 8

[0139] - Better_Offsets Indicator - 2 bits as provided by the upper layer parameter sl-BetaOffsets2ndSCI

[0140] Number of DMRS ports - 1 bit as defined in Table 9

[0141] -Modulation and coding method - 5 bits

[0142] - Additional MCS table indicator - 1 bit if one MCS table is set by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are set by the higher layer parameter sl-Additional-MCS-Table; 0 bit otherwise

[0143] PSFCH overhead indicator - 1 bit if the upper layer parameter sl-PSFCH-Period=2 or 4; otherwise 0 bit

[0144] Reserved Bits - The number of bits determined by the higher layer parameter sl-NumReservedBits, whose value is set to 0.

[0145] [Table 8]

[0146] [Table 9]

[0147] An example of SCI format 2-A will be described below.

[0148] 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 to decode the PSSCH.

[0149] The following information is transmitted via SCI Format 2-A.

[0150] - HARQ process number - 4 bits

[0151] -New Data Indicator - 1 bit

[0152] -redundancy version - 2 bits

[0153] - Source ID - 8 bits

[0154] -Destination ID - 16 bits

[0155] HARQ feedback activation / deactivation indicator - 1 bit

[0156] Cast Type Indicator - 2 bits as defined in Table 10

[0157] - CSI Request - 1 bit

[0158] [Table 10]

[0159] An example of SCI format 2-B will be described below.

[0160] SCI format 2-B is used for decoding the PSSCH and is used with HARQ operation when the HARQ-ACK information includes only NACK or there is no feedback of HARQ-ACK information.

[0161] The following information is transmitted via SCI Format 2-B.

[0162] - HARQ process number - 4 bits

[0163] -New Data Indicator - 1 bit

[0164] -redundancy version - 2 bits

[0165] - Source ID - 8 bits

[0166] -Destination ID - 16 bits

[0167] HARQ feedback activation / deactivation indicator - 1 bit

[0168] - Zone ID - 12 bits

[0169] - Range requirements - 4 bits determined by the higher layer parameter sl-ZoneConfigMCR-Index

[0170] 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.

[0171] 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.

[0172] 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.

[0173] On the other hand, the conventional NR-U (unlicensed spectrum) supports communication between terminals and base stations in unlicensed spectrum, and Rel-18 is scheduled to support a mechanism that can support communication between sidelink terminals in unlicensed spectrum.

[0174] In this disclosure, a channel can refer to a frequency axis resource set for performing Listen-Before-Talk (LBT). In NR-U, a channel refers to a 20 MHz LBT bandwidth and has the same meaning as an RB set. For example, an RB set is defined in Section 7 of 3GPP TS38.214V17.0.0.

[0175] In this disclosure, CO (channel occupancy) refers to the time / frequency axis resources acquired by a base station or a terminal after successful LBT.

[0176] In this disclosure, COT (channel occupancy time) refers to the time axis resource acquired by a base station or a terminal after successful LBT. It is shared between the base station (or terminal) that acquired CO and the terminal (or base station), which can be called COT sharing. Depending on the initiating device, this can be called gNB-initiated COT or UE-initiated COT.

[0177] A wireless communication system that supports unlicensed bands (shared spectrum) will be described below.

[0178] 10 illustrates an example of a wireless communication system supporting unlicensed spectrum according to an embodiment of the present disclosure. For example, the example of FIG. 10 may include an NR-U (unlicensed spectrum) wireless communication system. The example of FIG. 10 may be combined with various examples of the present disclosure.

[0179] In the following description, a cell operating in a licensed band (hereinafter, L-band) may be defined as an LCell, and a carrier of an LCell may be defined as a (DL / UL / SL)LCC. Also, a cell operating in an unlicensed band (hereinafter, U-band) may be defined as a UCell, and a carrier of a UCell may be defined as a (DL / UL / SL)UCC. A cell's carrier / carrier-frequency refers to the operating frequency (e.g., center frequency) of the cell. A cell / carrier (e.g., CC) is commonly referred to as a cell.

[0180] As shown in (a) of Figure 10, when a terminal and a base station transmit and receive signals via carrier-coupled LCC and UCC, the LCC is set as a PCC (Primary CC) and the UCC is set as an SCC (Secondary CC). As shown in (b) of Figure 10, the terminal and the base station can transmit and receive signals via one UCC or multiple carrier-coupled UCCs. That is, the terminal and the base station can transmit and receive signals via only UCC(s) without an LCC. For standalone operation, PRACH, PUCCH, PUSCH, SRS transmission, etc. are supported in the UCell.

[0181] In the embodiment of Figure 10, the base station can be replaced by a terminal, in which case, for example, PSCCH, PSSCH, PSFCH, S-SSB transmission, etc. are supported in the UCell.

[0182] Unless otherwise stated, the following definitions apply to terms used herein.

[0183] Channel: Consists of consecutive RBs in which a channel access procedure is performed in a shared spectrum, and can also be called a carrier or a part of a carrier.

[0184] -Channel access procedure (CAP): This refers to a procedure for evaluating channel availability based on sensing to determine whether other communication nodes can use the channel before transmitting a signal. The basic unit for sensing is T sl The sensing slot has a duration of 9 us. The base station or the terminal senses the channel during the sensing slot, and the power detected for at least 4 us within the sensing slot is equal to or exceeds the energy detection threshold X Thresh If it is smaller, the sensing slot period T sl is considered to be inactive. Otherwise, the sensing slot period T sl = 9us is considered a busy state. CAP can be called LBT (Listen-Before-Talk). For example, CAP (channel access procedure) can include LBT, and for CAP, channel sensing is performed to monitor the power of the channel during a specific time interval (channel sensing interval).

[0185] Channel occupancy: refers to the corresponding transmission(s) on the channel(s) by the base station / terminal after performing the channel access procedure.

[0186] Channel occupancy time (COT): After a base station / terminal performs a channel access procedure, this refers to the total time that the base station / terminal and any base station / terminal(s) sharing the channel occupancy can transmit on the channel. When determining COT, if the transmission gap is 25us or less, the gap period is also counted in COT. COT can be shared for transmission between the base station and corresponding terminal(s).

[0187] DL transmission burst: Defined as a set of transmissions from a base station with no gaps exceeding 16 us. Transmissions from a base station separated by gaps exceeding 16 us are considered separate DL transmission bursts. The base station can perform transmissions after the gaps without sensing channel availability within the DL transmission burst.

[0188] UL or SL transmission burst: Defined as a set of transmissions from a terminal without a gap exceeding 16 us. Transmissions from a terminal separated by a gap exceeding 16 us are considered separate UL or SL transmission bursts. The terminal can perform transmission after the gap without sensing channel availability within the UL or SL transmission burst.

[0189] Discovery burst: refers to a DL transmission burst containing a set of signal(s) and / or channel(s) bounded within a (time) window and associated duty cycle. In an LTE-based system, a discovery burst includes PSS, SSS, and CRS (cell-specific RS) as transmission(s) initiated by the base station, and may further include non-zero power CSI-RS. In an NR-based system, a discovery burst includes at least SS / PBCH blocks as transmission(s) initiated by the base station, and may further include a CORESET for a PDCCH scheduling a PDSCH with SIB1, a PDSCH carrying SIB1, and / or non-zero power CSI-RS.

[0190] 11 illustrates a method for occupying resources in an unlicensed spectrum according to one embodiment of the present disclosure. The embodiment of FIG. 11 can be combined with various embodiments of the present disclosure.

[0191] Referring to FIG. 11, a communication node (e.g., a base station, a terminal) in an unlicensed band needs to determine whether other communication nodes can use the channel before transmitting a signal. To this end, the communication node in the unlicensed band can perform a channel access procedure (CAP) to connect to a channel on which transmissions are to be performed. The channel access procedure is performed based on sensing. For example, a communication node can first perform carrier sensing (CS) before transmitting a signal to check whether other communication nodes are transmitting signals. A case where it is determined that other communication nodes are not transmitting signals is defined as a clear channel assessment (CCA) check. A CCA threshold (e.g., X) that is previously defined or set by an upper layer (e.g., RRC) is used to determine whether other communication nodes are transmitting signals. Thresh ), if a communication node detects energy higher than the CCA threshold in the channel, the communication node can determine the channel state as busy, otherwise determine the channel state as idle. If the channel state is determined to be idle, the communication node can start signal transmission in the unlicensed band. CAP can be substituted for LBT. For example, CAP (channel access procedure) can include LBT, and for CAP, channel sensing is performed to monitor the power of the channel during a specific time period (channel sensing period).

[0192] Table 11 illustrates the channel access procedures (CAP) supported in NR-U.

[0193] [Table 11]

[0194] Referring to Table 11, LBT types or CAPs for DL / UL / SL transmission are defined. However, Table 11 is merely an example, and new types or CAPs are defined in a similar manner. For example, Type 1 (also referred to as Cat-4 LBT) may be a random back-off based channel access procedure. For example, in the case of Cat-4, the contention window may change. For example, Type 2 can be performed in case of COT sharing within COT acquired by a base station or terminal.

[0195] The LBT-SB (Subband) (or RB set) will be described below.

[0196] In a wireless communication system supporting unlicensed bands, a cell (or carrier (e.g., CC)) or BWP configured in a terminal is configured with a wideband having a larger BW (Band Width) than that of existing LTE. However, the BW required for CCA based on independent LBT operation is limited due to regulations, etc. If a sub-band (SB) on which an individual LBT is performed is defined as an LBT-SB, multiple LBT-SBs are included in one wideband cell / BWP. The RB set constituting the LBT-SB is configured via higher layer (e.g., RRC) signaling. Therefore, one cell / BWP includes one or more LBT-SBs based on (i) the BW of the cell / BWP and (ii) RB set allocation information.

[0197] 12 illustrates a case where multiple LBT-SBs are included in an unlicensed band according to one embodiment of the present disclosure. The example of FIG. 12 can be combined with various other examples of the present disclosure.

[0198] Referring to FIG. 12, the BWP of a cell (or carrier) includes multiple LBT-SBs. The LBT-SB has, for example, a 20 MHz bandwidth. The LBT-SB is composed of multiple consecutive (P)RBs in the frequency domain and can be called a (P)RB set. Although not shown, guard bands (GBs) are included between the LBT-SBs. Therefore, the BWP is composed of the following format: {LBT-SB#0(RBset#0)+GB#0+LBT-SB#1(RBset#1+GB#1)+...+LBT-SB#(K-1)(RBset(#K-1))}. For convenience, the LBT-SB / RB index is set / defined to start from a lower frequency band and increase as it moves to a higher frequency band.

[0199] CAPC (Channel Access Priority Class) will be explained below.

[0200] The CAPC of the MAC CE and radio bearer is fixed or configurable to operate in FR1:

[0201] - Padding BSR (Buffer Status Report) and recommended bit rate are fixed as the lowest priority for MAC CE;

[0202] -Fixed as the highest priority for SRB0, SRB1, SRB3 and other MAC CEs;

[0203] Configured by the base station for SRB2 and DRB.

[0204] When selecting a CAPC for a DRB, the base station considers the 5QI of all QoS flows multiplexed into that DRB and considers fairness between other traffic types and transmissions. Table 12 shows which CAPC should be used for a standardized 5QI, i.e., the CAPC to use for a given QoS flow. For standardized 5QI, the CAPC is defined as shown in the table below, and for non-standardized 5QI, the CAPC that best matches the QoS characteristics should be used.

[0205] [Table 12]

[0206] A method for transmitting a downlink signal via an unlicensed band will be described below. For example, the method for transmitting a downlink signal via an unlicensed band can be applied to a method for transmitting a sidelink signal via an unlicensed band.

[0207] A base station may perform one of the following channel access procedures (CAP) for downlink signal transmission in the unlicensed spectrum:

[0208] (1) Type 1 Downlink (DL) CAP Method

[0209] In Type 1 DL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is random. Type 1 DL CAP can be applied to the following transmissions:

[0210] - a base station initiated transmission(s) including (i) a unicast PDSCH with user plane data, or (ii) a unicast PDSCH with user plane data and a unicast PDCCH scheduling user plane data, or

[0211] - Base station initiated transmission(s) having (i) only a discovery burst or (ii) a discovery burst multiplexed with non-unicast information.

[0212] 13 illustrates a CAP operation for a base station transmitting a downlink signal over an unlicensed spectrum, according to one embodiment of the present disclosure. The embodiment of FIG. 13 can be combined with various embodiments of the present disclosure.

[0213] Referring to FIG. 13, the base station first sets a defer duration T d The channel is sensed to be idle during the sensing slot period, and if the counter N then becomes 0, transmission can be performed (S134). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the following procedure:

[0214] Step 1) (S120) N=N init where N init is 0 to CW p is a random value evenly distributed between . Then go to step 4.

[0215] Step 2) (S140) If N>0 and the base station chooses to decrement the counter, set N=N-1.

[0216] Step 3) (S150) Sense the channel during the additional sensing slot period. If the additional sensing slot period is a pause (Y), proceed to step 4. If not (N), proceed to step 5.

[0217] Step 4) (S130) If N=0 (Y), then end the CAP procedure (S132). Otherwise (N), go to step 2.

[0218] Step 5) (S160) Additional delay period T dIf a busy sensing slot is detected within the additional delay period T d The channel is sensed until all sensing slots in are detected as idle.

[0219] Step 6) (S170) Additional delay period T d If the channel is sensed as idle during all sensing slot periods (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0220] Table 13 shows the m applied to CAP by channel connection priority class. p , minimum contention window (CW), maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes are shown to vary.

[0221] [Table 13]

[0222] Refer to Table 13, which defines 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.

[0223] Delay period T d is interval T f (16us)+m p T consecutive sensing slot intervals sl (9us) in that order. T f is the sensing slot period T at the start of the 16us period. sl Includes.

[0224] CW min、p <=CW p <=CW max、pCW p is CW p =CW min、p and is updated before step 1 (CW size update) based on HARQ-ACK feedback (e.g., ACK or NACK ratio) for the previous DL burst (e.g., PDSCH). p is determined based on the HARQ-ACK feedback for the previous DL burst. min、p It can be initialized to , increased to the next highest allowed value, or the existing value can be kept as is.

[0225] (2) Type 2 Downlink (DL) CAP Method

[0226] In Type 2 DL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is deterministic. Type 2 DL CAP is divided into Type 2A / 2B / 2C DL CAP.

[0227] Type 2A DL CAP is applicable to the following transmissions: In Type 2A DL CAP, the base station transmits the data for at least the sensing period T short_dl A transmission can be sent immediately after the channel is sensed as idle for T = 25us. short_dl is interval T f (=16us) and one sensing slot section immediately following it. f includes a sensing slot at the beginning of the interval.

[0228] - a base station initiated transmission(s) having (i) only a discovery burst, or (ii) a discovery burst multiplexed with non-unicast information, or

[0229] - Transmission by a base station after a 25us gap from a transmission by a terminal within a shared channel occupancy.

[0230] Type 2B DL ​​CAP is applicable to transmission(s) performed by the base station after a 16 us gap from transmission(s) by the terminal during the shared channel occupancy time. In Type 2B DL ​​CAP, the base station f A transmission can be sent immediately after the channel is sensed as idle for T = 16us. f The Type 2C DL CAP includes a sensing slot within the last 9 us of the interval. Type 2C DL CAP is applicable to transmission(s) performed by the base station after a maximum 16 us gap from the transmission(s) by the terminal within the shared channel occupancy time. In Type 2C DL CAP, the base station does not sense the channel before performing a transmission.

[0231] In the following, a method for transmitting an uplink signal via an unlicensed band will be described, which can be applied to a method for transmitting a sidelink signal via an unlicensed band.

[0232] A terminal performs Type 1 or Type 2 CAP for uplink signal transmission in an unlicensed band. Typically, a terminal can perform a CAP (e.g., Type 1 or Type 2) set by a base station for uplink signal transmission. For example, an UL grant (e.g., DCI format 0_0, 0_1) for scheduling PUSCH transmission includes CAP type indication information for the terminal.

[0233] (1) Type 1 Uplink (UL) CAP Method

[0234] In Type 1 UL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is random. Type 1 UL CAP can be applied to the next transmission.

[0235] -Scheduled and / or configured PUSCH / SRS transmission(s) from the base station

[0236] - PUCCH transmission(s) scheduled and / or configured from the base station

[0237] - Transmission related to RAP (Random Access Procedure)

[0238] 14 illustrates a Type 1 CAP operation of a terminal for uplink signal transmission according to one embodiment of the present disclosure. The embodiment of FIG. 14 can be combined with various embodiments of the present disclosure.

[0239] Referring to FIG. 14, the terminal first receives a delay period T d The channel is sensed to be idle during the sensing slot period, and if the counter N then becomes 0, transmission can be performed (S234). At this time, the counter N is adjusted by sensing the channel during the additional sensing slot period(s) according to the following procedure:

[0240] Step 1) (S220) N=N init where N init is 0 to CW p is a random value evenly distributed between . Then go to step 4.

[0241] Step 2) (S240) If N>0 and the terminal selects to decrement the counter, set N=N-1.

[0242] Step 3) (S250) Sense the channel during the additional sensing slot period. If the additional sensing slot period is a pause (Y), proceed to step 4. If not (N), proceed to step 5.

[0243] Step 4) (S230) If N=0 (Y), end the CAP procedure (S232). Otherwise (N), go to step 2.

[0244] Step 5) (S260) Additional delay period T d If a busy sensing slot is detected within the additional delay period T d Senses the channel until all sensing slots in are detected as idle.

[0245] Step 6) (S270) Additional delay period T d If the channel is sensed to be idle during all sensing slot periods (Y), proceed to step 4. Otherwise (N), proceed to step 5.

[0246] Table 14 shows the m applied to CAP by channel connection priority class. p , minimum CW, maximum CW, maximum channel occupancy time (MCOT) and allowed CW sizes vary.

[0247] [Table 14]

[0248] Refer to Table 14, which defines 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.

[0249] Delay period T d is interval T f (16us)+m p T consecutive sensing slot intervals sl (9us) in that order. T f is the sensing slot period T at the start of the 16us period. sl Includes.

[0250] CW min、p <=CW p<=CW max、p CW p is CW p =CW min、p and is updated before step 1 (CW size update) based on explicit / implicit acknowledgement to previous UL bursts (e.g., PUSCH). p CW based on explicit / implicit acknowledgement of previous UL bursts. min、p It can be initialized to , increased to the next highest allowed value, or the existing value can be kept as is.

[0251] (2) Type 2 Uplink (UL) CAP Method

[0252] In Type 2 UL CAP, the length of the time interval spanned by the sensing slots that are sensed in idle before transmission is deterministic. Type 2 UL CAP is classified into Type 2A / 2B / 2C UL CAP. In Type 2A UL CAP, the UE must sense the time interval T short_dl A transmission can be sent immediately after the channel is sensed as idle for T = 25us. short_dl is interval T f (=16us) and one sensing slot section immediately following it. f The sensing slot is included at the beginning of the period. In Type 2B UL CAP, the terminal starts the sensing period T f A transmission can be sent immediately after the channel is sensed as idle for 16us. In Type 2B UL CAP, T f includes a sensing slot within the last 9 us of the interval. In Type 2C UL CAP, the terminal does not sense the channel before transmitting.

[0253] For example, according to Type 1 LBT-based NR-U operation, a terminal with uplink data to transmit can select a CACP that is mapped to the 5QI of the data, and the terminal can set the parameters of the CACP (e.g., minimum contention window size, maximum contention window size, m p For example, the UE can select a random value between the minimum CW and the maximum CW mapped to CAPC and then select a back-off counter (BC). In this case, for example, BC can be a positive integer less than or equal to the random value. A UE that senses a channel decreases BC by 1 if the channel is idle. When BC becomes zero and the UE enters T d (T d =T f +m p *T sl If a terminal detects that the channel is idle for a period of time, it can occupy the channel and attempt to transmit data. For example, if a terminal detects that the channel is idle for a period of time, it can occupy the channel and attempt to transmit data. sl (=9 usec) is a basic sensing unit or sensing slot, and includes a measurement duration of at least 4 usec. For example, T f (=16usec) 9usec in front is T sl It consists of:

[0254] For example, according to Type 2 LBT-based NR-U operation, a terminal can perform Type 2 LBT (e.g., Type 2A LBT, Type 2B LBT, Type 2C LBT) within the COT to perform data transmission.

[0255] For example, Type 2A (also called Cat-2 LBT (oneshot LBT) or one-shot LBT) can be a 25-usec one-shot LBT. In this case, transmission can begin immediately after idle sensing for at least a 27-usec gap. Type 2A is used to initiate SSB and non-unicast DL information transmission. That is, the terminal can sense the channel for 25 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0256] For example, Type 2B can be a 16-usec one-shot LBT. In this case, transmission can start immediately after idle sensing for a 16-usec gap. That is, the terminal can sense the channel for 16 usec within the COT, and if the channel is idle, the terminal can occupy the channel and attempt data transmission.

[0257] For example, in the case of Type 2C (also called Cat-1 LBT or No LBT), LTB may not be performed. In this case, transmission may start immediately after a gap of up to 16 usec without sensing the channel before the transmission. The duration of the transmission may be up to 584 usec. The terminal may attempt transmission after 16 usec without sensing, and the terminal may perform transmission for up to 584 usec.

[0258] In a sidelink unlicensed band, a terminal can perform a channel access operation based on Listen Before Talk (LBT). Before connecting to a channel in an unlicensed band, the terminal needs to check whether the access channel is idle (e.g., a state in which the terminal does not occupy the channel, a state in which the terminal is connected to the channel and can transmit data) or busy (e.g., a state in which the channel is occupied and a data transmission / reception operation is performed on the channel, a terminal attempting to access the channel cannot transmit data when the channel is busy). That is, the operation in which the terminal checks whether the channel is idle or busy can be called Clear Channel Assessment (CCA), and the terminal can check whether the channel is idle or busy during the CCA duration.

[0259] The UE procedure for reporting HARQ-ACK in the sidelink will now be described.

[0260] The UE uses N to transmit a PSFCH containing HARQ-ACK information in response to the PSSCH reception. PSSCH subch The 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.

[0261] 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 then use k mod N PSFCH PSSCH = 0, slot t′ k SLIt is expected that there is a PSFCH transmission opportunity resource at (0k < T′max), where t′ k SL is a slot belonging 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 the upper layer not to transmit the PSFCH as a response to PSSCH reception. If the UE receives PSSCH in the resource pool and the HARQ feedback enable / disable indicator field included in the related SCI format 2-A or SCI format 2-B has a value of 1, the UE provides HARQ-ACK information via PSFCH transmission in the resource pool. The UE transmits the PSFCH in the first slot, where the first slot includes the PSFCH resource and is the slot after the minimum number of slots provided by sl-MinTimeGapPSFCH-r16 of the resource pool after the last slot of PSSCH reception.

[0262] The UE receives a set M of PRBs within the resource pool for PSFCH transmission in the PRBs of the resource pool PSFCH PRB、set from sl-PSFCH-RB-Set-r16. For the number N of subchannels for the resource pool provided by sl-NumSubchannel subch and N PSFCH PSSCH less than or equal to the number of PSSCH slots associated with the PSFCH slot, the UE selects M PRB、set PSFCH PRBs out of [(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 ), 0i <N PSFCH PSSCH , 0j <N subch and the allocation starts with increasing i and continues with increasing j. PSFCH PRB、set N subch N PSFCH PSSCH Expect it to be a multiple of .

[0263] 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 the instructions from the upper hierarchy,

[0264] -N PSFCH type = 1, and N PSSCH subch、slot The PRB is associated with the starting subchannel of the corresponding PSSCH.

[0265] -N PSFCH type =N PSSCH subch and N PSSCH subch N PSSCH subch、slot PRB is the N of the corresponding PSSCH. PSSCH subch Associated with one or more of the sub-channels.

[0266] The PSFCH resource is first determined by N PSFCH type N PSSCH subch、slot After PRBs are indexed in ascending order of PRB index, N PSFCH CS The cyclic shift pairs are indexed in ascending order of their cyclic shift pair indexes.

[0267] The UE receives the index of the PSFCH resource for PSFCH transmission in response to the PSSCH reception (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.

[0268] The UE uses Table 15 to determine N PSFCH CS and a cyclic shift pair index corresponding to the PSFCH resource index.

[0269] [Table 15]

[0270] If the UE detects SCI format 2-A with a cast type indicator field value of "01" or "10", the UE shall use the value m for calculating the cyclic shift α value as shown in Table 16, or if the UE detects SCI format 2-B or SCI format 2-A with a cast type indicator field value of "11", the UE shall use the value m for calculating the cyclic shift α value as shown in Table 17. csThe UE applies one cyclic shift of the cyclic shift pair to the sequence used for PSFCH transmission.

[0271] [Table 16]

[0272] [Table 17]

[0273] On the other hand, in the next-generation system, a terminal can perform SL transmission and / or reception operations in an unlicensed band. Meanwhile, operation in an unlicensed band is preceded by a channel sensing operation (e.g., energy detection / measurement) for a channel to be used before the terminal performs transmission according to band-specific regulations or requirements. The terminal can perform transmission to the unlicensed band only if the channel or RB set to be used is determined to be idle (e.g., if the measured energy is equal to or less than a specific threshold) based on the result of the channel sensing. On the other hand, if the channel or RB set to be used is determined to be busy (e.g., if the measured energy is equal to or greater than a specific threshold) based on the result of the channel sensing, the terminal can cancel all or part of the transmission to the unlicensed band.

[0274] On the other hand, when operating in an unlicensed band, after a terminal transmits for a specific time period, the channel sensing operation is omitted or simplified (the channel sensing period is made relatively small) within a certain period of time, while after a certain period of time has passed after transmission, a general channel sensing operation is performed to determine whether or not transmission is possible.

[0275] On the other hand, in transmission in unlicensed bands, depending on regulations or requirements, the time duration and / or frequency occupation area size and / or power spectral density (PSD) of the signal / channel transmitted by the terminal may be above a certain level.

[0276] On the other hand, in the unlicensed band, in order to simplify channel sensing, the content that a channel secured through initial general channel sensing is occupied for a certain period of time may be notified through COT (channel occupancy time) interval information, and the maximum length of the COT interval is set differently depending on the priority of the service or data packet or the channel access priority class (CAPC, channel access priority class).

[0277] Meanwhile, according to the standard for unlicensed bands, sidelink transmission can be transmitted via multiple spaced RBs. Meanwhile, for uplink channel transmission in unlicensed bands, the UE can receive information on one or multiple RB set(s) and one or multiple interlaces from the base station, and the final transmission resource can be determined as the intersection of the RBs in the provided RB set and the RBs corresponding to the provided interlaces.

[0278] Meanwhile, interlaces can be defined by a common RB (CRB) grid. For example, in a CRB grid, in a set of RBs configured at 10 RB intervals at 15 kHz and in a set of RBs configured at 5 RB intervals at 30 kHz, the interlace index of each interlace can be determined based on an RB offset from CRB#0.

[0279] Meanwhile, in the case of sidelink communication, since sensing and / or resource (re)selection is performed on a subchannel basis, it may be required that the subchannels be expressed in the form of an interlace and / or RB set, thereby enabling maximum reuse of subchannel-based sensing operations and / or resource reservation methods.

[0280] Meanwhile, when sidelink transmission and reception is performed based on 60 kHz SCS, a method is needed to ensure that the bandwidth size within an occupied channel is at a certain ratio (e.g., 80%) or more of the channel size according to the OCB (occupied channel bandwidth) requirement.

[0281] In various embodiments of the present disclosure, the embodiments for a 60 kHz SCS may be extended to SCSs other than a 15 kHz and / or 30 kHz SCS. In various embodiments of the present disclosure, the embodiments for a 60 kHz SCS may be extended to 15 kHz and / or 30 kHz SCS.

[0282] On the other hand, if the number of PRBs allocated for sidelink transmission is significantly increased to meet the OCB and PSD requirements, frequency domain resources are insufficient, especially for PSFCH resources. On the other hand, if a small number of PRBs are allocated to satisfy the OCB requirements and positioned at the edge of the channel, the total transmit power is limited by the PSD requirement.

[0283] Meanwhile, the OCB requirement can be temporarily omitted during the COT (Channel Occupancy Time) period, but in this case, the occupied channel bandwidth must still be greater than and / or equal to 2 MHz, for example.

[0284] For example, when transmitting a PSCCH / PSSCH, if the PSSCH is a contiguous RB-based transmission (e.g., if constituent subchannels are composed of consecutive PRBs), subchannels in which some constituent PRBs are located outside the RB set can be used as transmission resources to meet the OCB requirement. For example, when using the specific subchannel for PSCCH / PSSCH transmission, the UE can use only PRBs included in the RB set among the PRBs constituting the subchannel. For example, this method is used when an RB set adjacent to the RB set is not included in the transmission resources. For example, when using the specific subchannel for PSCCH / PSSCH transmission, the UE can use at least the minimum constituent PRBs to meet the OCB requirement as transmission resources. For example, when calculating a TBS for the additionally used subchannel, the UE can exclude the resources of the subchannel when calculating the number of PRBs. For example, when calculating the TBS for the additionally used subchannel, the terminal may include the resource of the subchannel when calculating the number of PRBs, assuming that all configured PRBs are used.

[0285] For example, when transmitting an SL channel, a non-contiguous PRB set may be used as a transmission resource. For example, the PRB spacing within the non-contiguous PRB set may be (pre)configured. For example, for a 60 kHz SCS, the RB indices of a first PRB set are 0, 2, 4, 6, ..., and the RB indices of a second PRB set are 1, 3, 5, .... For example, for a 60 kHz SCS, the RB indices of a first PRB set are 0, 3, 6, 9, ..., and the RB indices of a second PRB set are 1, 4, 7, ..., and the RB indices of a third PRB set are 2, 5, 8, .... For example, in this scheme, transmission power can be maximized according to PSD requirements, but the amount of divisible resources is reduced, resulting in poor scheduling flexibility.

[0286] For example, the non-contiguous PRB set may include at least two PRBs that satisfy the OCB requirement. For example, the PRB set may include at least an RB index N and an RB index N+M. For example, the value of M may be (pre-)configured to satisfy the OCB requirement. For example, the value of M may be the minimum value that satisfies the OCB requirement. For example, when the size of an RB set is P, the value of M may be P*0.8 rounded up or minus 1. For example, the value of N may be a set of values ​​that ensures that N and N+M are all present in a specific RB set. For example, the number of N values ​​may be P-0.8*P rounded up or 0.2*P rounded down, or may be smaller than the above values. For example, the number of N values ​​or candidate values ​​for N may be (pre-)configured for each resource pool and / or each SL channel.

[0287] Meanwhile, in addition to the two PRBs for the OCB requirement in the PRB set, the UE may further include an additional PRB to overcome the transmit power limitation due to the PSD requirement. For example, the PRBs constituting the RB set may be divided into multiple RB subsets, each of which may be rounded up by P-0.8*P or rounded down by 0.2*P, and the non-contiguous PRB set may be configured to include one RB from each RB subset for all or some of the RB subsets. For example, the PRB spacing between the RB subsets may be 0 or a non-zero integer value, and the presence and value of the PRB spacing may be set differently depending on the size of the RB set. For example, the non-contiguous PRB set may be configured with an RB index N, a rounded down value of N+0.2*P, a rounded down value of N+0.2*P*2, ..., N+M.

[0288] For example, when a PSFCH resource is derived from a PSSCH resource and / or when the PSFCH resource has the non-contiguous PRB set as a frequency resource, the method of deriving RBs for the PSFCH from the PSSCH subchannel index and PSSCH slot index can be extended to the method of deriving the PRB set for the PSFCH.

[0289] Meanwhile, the UE can use one or more common RBs for actual transmission in addition to the PSFCH RBs (for SL HARQ-ACK feedback) to meet the OCB requirements when transmitting the PSFCH. For example, the UE can use the minimum number of common RBs for transmission that can satisfy the OCB requirements. For example, the (position of) the selected common RBs varies depending on the position of the actual PSFCH RBs. For example, if the OCB requirements are met when the UE transmits multiple PSFCHs, the UE does not use additional common RBs for transmission.

[0290] For example, if a terminal has the capability of simultaneously transmitting up to N PSFCHs, and if the terminal uses M common RBs for transmission, the actual maximum number of PSFCHs that can be simultaneously transmitted can be changed to NM.

[0291] For example, when a terminal selects a PSFCH to transmit, the terminal may select a PSFCH transmission combination that satisfies the OCB requirements as a transmission target by giving priority to the PSFCH transmission combination rather than selecting based on the respective PSFCH SL priorities.

[0292] For example, when selecting a PSFCH to transmit, the UE may select a PSFCH transmission combination that minimizes the number of common RBs used to satisfy the OCB requirement, rather than selecting a PSFCH based on the priority of each PSFCH. For example, the UE may select a PSFCH to be transmitted based on the required number of common RBs.

[0293] According to one embodiment of the present disclosure, a terminal can allocate a minimum amount of total transmission power (e.g., a (pre)set power value or a power value according to a (pre)set ratio) to common RB(s) or for each common RB, and allocate the remaining transmission power equally to PSFCH transmission (for SL HARQ-ACK feedback).

[0294] Meanwhile, when transmitting a PSFCH, a terminal can use additional common RB-based interlaces for actual transmission in addition to PSFCH RBs (for SL HARQ-ACK feedback). For example, depending on the multiple PSFCH combinations actually transmitted by the terminal, common RB-based interlaces may not be used for actual transmission, and / or only some of the RBs constituting the common RB-based interlaces may be used for actual transmission. For example, the positions of RBs constituting the common RB-based interlaces used for transmission differ depending on the actual PSFCH RB positions.

[0295] For example, the maximum number of PSFCHs that can be simultaneously transmitted differs depending on whether or not the terminal transmits interlaces based on a common RB.

[0296] For example, if a terminal can simultaneously transmit up to N PSFCHs, the actual maximum number of PSFCHs that can be simultaneously transmitted can be changed to NM (e.g., M is 1 or a specific value) when transmitting interlaces based on a common RB.

[0297] For example, when a terminal selects a PSFCH to transmit, the terminal may select a transmission target by preferentially considering a PSFCH transmission combination that minimizes the number of RBs used to configure a common RB-based interlace to satisfy OCB requirements, rather than selecting based on each PSFCH priority. Alternatively, for example, the selection of a transmission target may be performed by preferentially considering a PSFCH transmission combination that minimizes the number of RBs used to configure a common RB-based interlace to satisfy OCB requirements, rather than selecting based on each PSFCH priority. For example, the terminal may select a PSFCH to transmit based on whether a common RB-based interlace is necessary and / or the number of RBs configuring a common RB-based interlace that is required to be transmitted.

[0298] For example, the terminal may allocate a minimum amount of transmission power (e.g., a (pre)set power value or a power value according to a (pre)set ratio) of the total transmission power to a common RB-based interlace or to each (actual transmission) RB constituting a common RB-based interlace, and may equally allocate the remaining transmission power to PSFCH transmission (for SL HARQ-ACK feedback).

[0299] Meanwhile, the PSFCH transmitted by the terminal may exist in multiple RB sets. For example, if the PSFCH transmissions simultaneously transmitted by the terminal exist in multiple RB sets and / or if the channel sensing results for the multiple RB sets are idle, the common RBs for the terminal to satisfy the OCB requirement are all or part of the RBs corresponding to the same interlace index. For example, the RBs (e.g., the common RBs for the terminal to satisfy the OCB requirement) may belong to the multiple RB sets and / or guard bands between the multiple RB sets.

[0300] For example, in the above, if the channel sensing result for some RB sets is busy, RBs corresponding to interlaces belonging to a guard band between an idle RB set and a busy RB set are not used for transmission when the terminal transmits the PSFCH. For example, in the above, if the channel sensing result for an idle RB set is within a common COT, the terminal does not use all or some of the RBs corresponding to the RB set and / or interlaces belonging to guard bands adjacent to the RB set for transmission when transmitting the PSFCH. Alternatively, for example, in the above, if the channel sensing result for an idle RB set is within a common COT, all or some of the RBs corresponding to (or included in) the corresponding RB set and / or interlaces belonging to guard bands adjacent to the corresponding RB set are not used when the terminal transmits the PSFCH.

[0301] In various embodiments of the present disclosure, when a terminal transmits a PSFCH via COT sharing, common RBs and / or common RB-based interlace transmission may be omitted. For example, a terminal may transmit common RBs and / or common RB-based interlaces only when transmitting a PSFCH via Type 1 CAP (channel access procedure).

[0302] For example, when transmitting a PSFCH, the UE may transmit using PRBs corresponding to a specific interlace. Here, for example, some of the PRBs (one or two RBs, or a small number of RBs) may be used for SL HARQ-ACK feedback. For example, (the part of) the PRB positions may be derived from the PSSCH resources corresponding to the SL HARQ-ACK feedback. For example, the remaining PRBs (excluding the PRBs from which the positions are derived from the PRBs corresponding to a specific interlace) may be used for signal transmission unrelated to the SL HARQ-ACK feedback. This operation may be performed because, when simultaneous transmission is performed via a specific interlace and a separate PRB that is FDM-multiplexed therewith, PAPR may increase and / or performance may deteriorate as transmit power is allocated according to PSD requirements.

[0303] For example, when a UE transmits a PSFCH in an interlaced structure, the PSD for the PRB(s) used for SL HARQ-ACK feedback and the other PRB(s) may be set to be different, e.g., the PSD for the PRB(s) used for SL HARQ-ACK feedback may be set to be larger than the PSD for the other PRB(s).

[0304] For example, the UE may determine PRB(s) to be used for SL HARQ-ACK feedback according to PSSCH resources (slots and / or subchannels) and may use all or part of the interlace to which the PRB(s) belong for PSFCH transmission. For example, the UE may exclude from PSFCH transmission PRBs belonging to the interlace that the UE determines, based on the received SCI, will be used by other UEs for SL HARQ-ACK feedback transmission.

[0305] 15 illustrates a structure of a PSFCH resource in an unlicensed band according to one embodiment of the present disclosure. The embodiment of FIG. 15 can be combined with various embodiments of the present disclosure.

[0306] 15 shows RB sets of an interlace structure. For example, a first interlace may be composed of PRBs whose number is an integer multiple (N) of K3. For example, K3 is an integer (e.g., K3=2). For example, the first interlace may be composed of N PRB subsets. For example, the first interlace and a common interlace may be included in the same RB set.

[0307] For example, the PSFCH resource may include the common interlace and the first interlace. For example, at least one PSFCH transmission may be performed based on the PSFCH resource, and each PSFCH transmission may be mapped to one PRB subset. That is, each PSFCH transmission may be transmitted based on the common interlace and the mapped PRB subset.

[0308] 16 illustrates a PRB subset to which at least one PSSCH is mapped in an unlicensed spectrum according to one embodiment of the present disclosure. The embodiment of FIG. 16 can be combined with various embodiments of the present disclosure.

[0309] Referring to Figure 16, a first interlace including a common interlace and N PRB subsets is shown. For example, each PRB subset may consist of K3 consecutive PRBs (e.g., K3 = 2). For example, if a terminal is to perform M PSFCH transmissions for M PSSCHs, the M PSSCHs may be mapped to M PRB subsets. That is, for example, a first PRB subset mapped to the first PSSCH may be used to transmit first HARQ feedback for the first PSSCH, and a second PRB subset may be used to transmit second HARQ feedback for the second PSSCH. That is, each PSFCH transmission may be transmitted based on the common interlace and the mapped PRB subset.

[0310] The above described operations can be performed based on the features described in the table below.

[0311] [Table 18]

[0312] [Table 19]

[0313] [Table 20]

[0314] [Table 21]

[0315] [Table 22]

[0316] On the other hand, since the PRB used for SL HARQ-ACK feedback is different for each terminal, the SL HARQ-ACK feedback signal and the common signal for OCB requirements may overlap in the same PRB, and in this case, separate processing is required to avoid resource collisions.

[0317] For example, when a UE transmits a PSFCH in an interlaced structure, a sequence mapped to PRB(s) used for SL HARQ-ACK feedback and a sequence mapped to other PRB(s) may have different sequence ID values. For example, the sequence ID values ​​may be (pre)configured for a sequence used for SL HARQ-ACK feedback transmission and other sequences (to satisfy OCB requirements), respectively.

[0318] For example, when a terminal transmits a PSFCH in an interlaced structure, a sequence mapped to PRB(s) used for SL HARQ-ACK feedback can also be used for mapping to other PRB(s).

[0319] For example, when a UE transmits a PSFCH in an interlaced structure, the cyclic shift value(s) that can be used for PRB(s) used for SL HARQ-ACK feedback (by ACK or NACK) and the cyclic shift value(s) that can be applied to (or can be used for) other PRB(s) can be distinguished. This is to enable different sequences to be distinguished at least through CDM when a specific UE uses the same PRB for SL HARQ-ACK feedback transmission and another UE uses it for other purposes. For example, in the above, the UE can select a combination of cyclic shift values ​​for PRB(s) not used for SL HARQ-ACK feedback transmission so that the PAPR for PSFCH transmission is low.

[0320] For example, the UE may expect that a candidate set of PRBs used for SL HARQ-ACK feedback is (pre-configured) to belong to a specific interlace(s). For example, the specific interlace(s) can be used by the UE when transmitting a PSFCH. For example, the candidate set of PRBs used for SL HARQ-ACK feedback may be (pre-configured) to belong to a specific interlace(s).

[0321] For example, when a UE transmits a PSFCH in an interlaced structure, information on the number and / or PRB positions of PRBs used for SL HARQ-ACK feedback can be (pre-)configured. For example, if a plurality of PRBs are used for the SL HARQ-ACK feedback, the UE may select a first PRB from the PSSCH resource corresponding to the SL HARQ-ACK feedback, and then derive a second PRB from the first PRB, and / or derive a plurality of PRBs from the PSSCH resource. For example, the lowest and highest PRBs of the PRBs used for the SL HARQ-ACK feedback may cover at least 2 MHz.

[0322] Meanwhile, the transmit power during sidelink transmission may need to be adjusted according to the PSD requirement. For example, after calculating the required sidelink transmission power, the actual sidelink transmit power may be scaled down (by the transmitting terminal) according to the PSD requirement. For example, when adjusting the sidelink transmit power according to the PSD requirement, the PSD may be maintained for PRBs belonging to the same subchannel, the same interlace, or the same RB set. For example, when adjusting the sidelink transmit power according to the PSD requirement, the PSD may vary per subchannel, per interlace, or per RB set. For example, when adjusting the sidelink transmit power according to the PSD requirement, the PSD may vary per PSFCH PRB or per PSFCH transmission.

[0323] For example, after the required transmission power for multiple simultaneous PSFCH transmissions and the number of PSFCHs that can be simultaneously transmitted are calculated, the sidelink transmission power may be scaled down (by the UE) according to the PSD requirement. For example, after the required transmission power for a single PSFCH is calculated, the sidelink transmission power may be scaled down (by the UE) according to the PSD requirement, and / or the required transmission power for multiple PSFCH transmissions and the number of PSFCHs that can be simultaneously transmitted may be determined (by the UE). For example, when adjusting the sidelink transmission power according to the PSD requirement, the transmission power for multiple PSFCH transmissions may be scaled down equally. For example, when adjusting the sidelink transmission power according to the PSD requirement, the transmission power for multiple PSFCH transmissions may be scaled down non-uniformly per PSFCH transmission unit and / or per RB set unit.

[0324] For example, when calculating the required transmission power for sidelink transmission according to the PSD requirement, the terminal may adjust and / or apply the nominal power (P0 value) and / or an additional offset value differently.

[0325] In various embodiments of the present disclosure, the RB index is a PRB index or a CRB index.

[0326] In various embodiments of the present disclosure, the methods described for each SL channel are not limited to each explicitly specified SL channel, but can be extended and applied to different SL channels.

[0327] In various embodiments of the present disclosure, various schemes may be applied differently depending on the size of the subcarrier spacing.

[0328] In various embodiments of the present disclosure, various schemes may be applied differently depending on the type of sidelink channel.

[0329] In various embodiments of the present disclosure, various methods may be applied differently depending on the CAPC value and / or the SL priority value.

[0330] In various embodiments of the present disclosure, various schemes may be applied differently depending on the RB set and / or the size of the RB set.

[0331] In various embodiments of the present disclosure, various methods may be applied differently inside the COT and / or outside the COT.

[0332] The proposed method can be applied to the following devices: First, the processor 202 of the receiving terminal can configure at least one BWP, and then the processor 202 of the receiving terminal can control the transceiver 206 of the receiving terminal to receive sidelink-associated physical channels and / or sidelink-associated reference signals from the transmitting terminal on the at least one BWP.

[0333] Meanwhile, the SL terminal may not be able to perform a receiving operation while performing a transmission, and may not be able to perform a channel sensing operation during the above time period. For example, if a terminal additionally excludes an LBT period for a reserved resource of another terminal during resource selection, when the other terminal performs type 1 channel sensing, there is a problem that the LBT period of the corresponding terminal is difficult to accurately grasp.

[0334] For example, within a half-duplex restricted section, the channel sensing result may be assumed to be a (pre-set) specific result value, or the channel sensing section may be extended to the restricted section.

[0335] For example, when selecting resources, if additional resources equivalent to the LBT interval are excluded before and after the reserved resources of another terminal, the LBT interval can be determined by the implementation of the terminal, or a value (pre-set) by CAPC can be used as the LBT interval.

[0336] According to the embodiments of the present disclosure, a terminal can efficiently perform a channel sensing operation even in a half-duplex situation, and can dynamically consider the LBT period when (re)selecting resources.

[0337] According to the existing technology, there is a problem that the requirements of the unlicensed band are not taken into consideration when determining the PSFCH resource, and therefore the PSFCH transmission cannot be performed in the unlicensed band. According to the embodiment of the present disclosure, the PSFCH resource can satisfy the OCB requirements of communication on the unlicensed band, and it is possible to perform PSFCH resource mapping suitable for the interlace structure of the unlicensed band.

[0338] 17 illustrates a procedure for a first 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.

[0339] 17 , in step S1710, a first device determines PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH). For example, the PSFCH resources include at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH is mapped to at least one PRB subset, and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB. In step S1720, the first device performs transmission of the at least one PSFCH based on the PSFCH resources.

[0340] For example, the number of the at least one dedicated PRB is an integer multiple of K3.

[0341] For example, the common interlace and the first interlace are included in a first RB set.

[0342] For example, the PSFCH resource is included in the first RB set and a second RB set different from the first RB set.

[0343] For example, the PSFCH resource includes a second common interlace that is included in the second RB set and has the same index as the common interlace.

[0344] For example, based on the channel sensing result for the first RB set being different from the channel sensing result for the second RB set, a first resource included in the common interlace or the second common interlace is not used for transmitting the at least one PSFCH.

[0345] For example, the RB set from which the at least one PSSCH is transmitted and the RB set in which the PSFCH resource is included are the same.

[0346] For example, a PRB to which the at least one PSFCH is not mapped among the at least one dedicated PRB is not used for transmitting the at least one PSFCH.

[0347] For example, a first sequence mapped to a PRB to which the at least one PSSCH is mapped may be different from a second sequence mapped to a PRB to which the at least one PSSCH is not mapped.

[0348] For example, a first cyclic shift applied to a PRB to which the at least one PSSCH is mapped may be different from a second cyclic shift applied to a PRB to which the at least one PSSCH is not mapped.

[0349] For example, the K3 is preset.

[0350] For example, the frequency range of the at least one PRB subset is 2 MHz or greater.

[0351] For example, the first device may additionally adjust transmit power for transmission of the at least one PSFCH based on a power spectral density (PSD) requirement, e.g., the transmit power associated with each of the at least one dedicated PRB may be adjusted on an interlace-by-interlace basis.

[0352] The detailed embodiment is applicable to various devices described below. First, the processor 102 of the first device 100 determines PSFCH resources for transmitting at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH). For example, the PSFCH resources include at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH is mapped to at least one PRB subset, and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB. Then, the processor 102 of the first device 100 controls the transceiver 106 to transmit the at least one PSFCH based on the PSFCH resources.

[0353] According to an embodiment of the present disclosure, there is provided a first device for performing wireless communication. For example, the first device includes at least one transceiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform operations. For example, the operations include: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

[0354] For example, the number of the at least one dedicated PRB is an integer multiple of K3.

[0355] For example, the common interlace and the first interlace are included in a first RB set.

[0356] For example, the PSFCH resource is included in the first RB set and a second RB set different from the first RB set.

[0357] For example, the PSFCH resource includes a second common interlace that is included in the second RB set and has the same index as the common interlace.

[0358] For example, based on the channel sensing result for the first RB set being different from the channel sensing result for the second RB set, a first resource included in the common interlace or the second common interlace is not used for transmitting the at least one PSFCH.

[0359] For example, the RB set from which the at least one PSSCH is transmitted and the RB set in which the PSFCH resource is included are the same.

[0360] For example, a PRB to which the at least one PSFCH is not mapped among the at least one dedicated PRB is not used for transmitting the at least one PSFCH.

[0361] For example, a first sequence mapped to a PRB to which the at least one PSSCH is mapped may be different from a second sequence mapped to a PRB to which the at least one PSSCH is not mapped.

[0362] For example, a first cyclic shift applied to a PRB to which the at least one PSSCH is mapped may be different from a second cyclic shift applied to a PRB to which the at least one PSSCH is not mapped.

[0363] For example, the K3 is preset.

[0364] For example, the frequency range of the at least one PRB subset is 2 MHz or greater.

[0365] For example, the operations may additionally include adjusting a transmit power for transmission of the at least one PSFCH based on a power spectral density (PSD) requirement, e.g., the transmit power associated with each of the at least one dedicated PRB is adjusted on an interlace-by-interlace basis.

[0366] According to an embodiment of the present disclosure, there is provided an apparatus configured to control a first terminal. For example, the apparatus includes at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first terminal to perform operations. For example, the operations include: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K3 PRBs included in the at least one dedicated PRB; and performing transmission of the at least one PSFCH based on the PSFCH resources.

[0367] According to one embodiment of the present disclosure, a non-transitory computer-readable storage medium having stored thereon instructions, for example, the instructions, when executed, cause a first device to: determine PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH), the PSFCH resources including at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace, the at least one PSSCH mapped to at least one PRB subset, each of the at least one PRB subset including K PRBs included in the at least one dedicated PRB; and perform transmission of the at least one PSFCH based on the PSFCH resources.

[0368] 18 illustrates a procedure for a second device to perform wireless communication according to one embodiment of the present disclosure. The embodiment of FIG. 18 may be combined with various embodiments of the present disclosure.

[0369] Referring to FIG. 18 , in step S1810, a second device transmits sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH). In step S1820, the second device transmits a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH. In step S1830, the second device receives hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources. For example, the first PSSCH is mapped to the first PRB subset, the first PRB subset including K3 PRBs included in at least one dedicated physical resource block (PRB), and the PSFCH resources include the at least one dedicated PRB and a common interlace included in a first interlace.

[0370] For example, the number of the at least one dedicated PRB is an integer multiple of K3.

[0371] The detailed embodiment is applicable to various devices described below. First, the processor 202 of the second device 200 controls the transceiver 206 to transmit sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to the first device 100 via a physical sidelink control channel (PSCCH). Then, the processor 202 of the second device 200 controls the transceiver 206 to transmit a medium access control (MAC) protocol data unit (PDU) to the first device 100 via the first PSSCH. Then, the processor 202 of the second device 200 controls the transceiver 206 to receive hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources. For example, the first PSSCH is mapped to the first PRB subset, the first PRB subset includes K3 PRBs included in at least one dedicated PRB (physical resource block), and the PSFCH resource includes the at least one dedicated PRB included in a first interlace and a common interlace.

[0372] According to one embodiment of the present disclosure, there is provided a second device for performing wireless communication, the second device including at least one transceiver, at least one processor, and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform an operation. For example, the operations include: transmitting sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in a physical sidelink feedback channel (PSFCH) resource; wherein the first PSSCH is mapped to the first PRB subset, the first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB), and the PSFCH resource includes the at least one dedicated PRB and a common interlace included in a first interlace.

[0373] For example, the number of the at least one dedicated PRB is an integer multiple of K3.

[0374] The various embodiments of the present disclosure may be intercombined.

[0375] An apparatus to which various embodiments of the present disclosure are applied will be described below.

[0376] 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).

[0377] The following description will be given in more detail with reference to the accompanying drawings. In the following drawings and descriptions, unless otherwise specified, the same reference numerals in the drawings may represent the same or corresponding hardware blocks, software blocks, or functional blocks.

[0378] 19 illustrates a communication system 1 according to one embodiment of the present disclosure. The embodiment of FIG. 19 can be combined with various embodiments of the present disclosure.

[0379] 19, 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.

[0380] 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.

[0381] 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.

[0382] Wireless communication / 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.

[0383] 20 illustrates a wireless device according to one embodiment of the present disclosure. The embodiment of FIG. 20 can be combined with various embodiments of the present disclosure.

[0384] 20, 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). Here, {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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] 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.

[0390] 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, etc., of this document 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, etc., 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.

[0391] 21 illustrates a signal processing circuit for a transmission signal according to one embodiment of the present disclosure. The embodiment of FIG. 21 can be combined with various embodiments of the present disclosure.

[0392] 21, the signal processing circuit 1000 may include a scrambler 1010, a modulator 1020, a layer mapper 1030, a precoder 1040, a resource mapper 1050, and a signal generator 1060. Without being limited thereto, the operations / functions of FIG. 21 may be executed by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 20. The hardware elements of FIG. 21 may be implemented by the processors 102, 202 and / or the transceivers 106, 206 of FIG. 20. For example, the blocks 1010 to 1060 may be implemented by the processors 102, 202 of FIG. 20. Furthermore, the blocks 1010 to 1050 may be implemented by the processors 102, 202 of FIG. 20, and the block 1060 may be implemented by the transceivers 106, 206 of FIG. 20.

[0393] The codeword can be converted into a radio signal via the signal processing circuit 1000 of FIG. 21. 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).

[0394] 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.

[0395] 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.

[0396] 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. 21. For example, a wireless device (e.g., 100 or 200 in FIG. 20) 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.

[0397] 22 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. 19). The embodiment of FIG. 22 may be combined with various embodiments of the present disclosure.

[0398] 22, wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 20 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. 20. 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. 20. 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.

[0399] 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. 19), a vehicle (100b-1, 100b-2 in FIG. 19), an XR device (100c in FIG. 19), a mobile device (100d in FIG. 19), a home appliance (100e in FIG. 19), an IoT device (100f in FIG. 19), 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. 19), a base station (200 in FIG. 19), a network node, etc. The wireless device may be mobile or fixed depending on the use case / service.

[0400] 22, various elements, components, units / sections, 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 wire, 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 / section, 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.

[0401] The embodiment of FIG. 22 will be described in more detail below with reference to other drawings.

[0402] FIG. 23 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. 23 may be combined with various embodiments of the present disclosure.

[0403] 23, 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. 22, respectively.

[0404] 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.

[0405] 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.

[0406] 24 illustrates a vehicle or an autonomous vehicle according to one 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. 24 may be combined with various embodiments of the present disclosure.

[0407] 24, 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. 22, respectively.

[0408] 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.

[0409] 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.

[0410] 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.

[0411] [Claims at the time of international application] [Claim 1] 1. A method for a first device to perform wireless communication, comprising: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resources. [Claim 2] The method of claim 1 , wherein the number of the at least one dedicated PRB is an integer multiple of K3. [Claim 3] The method of claim 1 , wherein the common interlace and the first interlace are included in a first RB set. [Claim 4] The method of claim 3 , wherein the PSFCH resource is included in the first RB set and a second RB set different from the first RB set. [Claim 5] The method of claim 4 , wherein the PSFCH resource includes a second common interlace of the same index as the common interlace included in the second RB set. [Claim 6] 6. The method of claim 5, wherein a first resource included in the common interlace or the second common interlace is not used for transmitting the at least one PSFCH based on a result of channel sensing for the first RB set being different from a result of channel sensing for the second RB set. [Claim 7] The method of claim 1 , wherein the RB set on which the at least one PSSCH is transmitted is the same as the RB set on which the PSFCH resource is included. [Claim 8] The method of claim 1 , wherein a PRB to which the at least one PSFCH is not mapped among the at least one dedicated PRB is not used to transmit the at least one PSFCH. [Claim 9] The method of claim 8, wherein a first sequence mapped to the PRB to which the at least one PSSCH is mapped is different from a second sequence mapped to the PRB to which the at least one PSSCH is not mapped. [Claim 10] 9. The method of claim 8, wherein a first cyclic shift applied to PRBs to which the at least one PSSCH is mapped is different from a second cyclic shift applied to PRBs to which the at least one PSSCH is not mapped. [Claim 11] The method of claim 1 , wherein K3 is preset. [Claim 12] The method of claim 1 , wherein the frequency range of the at least one PRB subset is equal to or greater than 2 MHz. [Claim 13] adjusting a transmit power for the transmission of the at least one PSFCH based on a power spectral density (PSD) requirement; The method of claim 1 , wherein a transmit power associated with each of the at least one dedicated PRB is adjusted on an interlace-by-interlace basis. [Claim 14] a first device for performing wireless communication, at least one transmitter / receiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform an operation; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resource. [Claim 15] 1. A device configured to control a first terminal, comprising: at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first terminal to perform an operation; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resource. [Claim 16] A non-transitory computer-readable storage medium having instructions recorded thereon, When executed, the instructions cause a first device to perform an action; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subsets includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resources. [Claim 17] A method for a second device to perform wireless communication, comprising: sending sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources; the first PSSCH is mapped to the first PRB subset; The first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB); and The method, wherein the PSFCH resources include the at least one dedicated PRB included in a first interlace and a common interlace. [Claim 18] 18. The method of claim 17, wherein the number of the at least one dedicated PRB is an integer multiple of K3. [Claim 19] a second device for performing wireless communication, at least one transmitter / receiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform an operation; The operation is sending sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources; the first PSSCH is mapped to the first PRB subset; The first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB); and A second device, wherein the PSFCH resource includes the at least one dedicated PRB included in a first interlace and a common interlace. [Claim 20] 20. The method of claim 19, wherein the number of the at least one dedicated PRB is an integer multiple of K3.

Claims

1. 1. A method for performing wireless communication in a first device, comprising: determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subset includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resources.

2. The method of claim 1 , wherein the number of the at least one dedicated PRB is an integer multiple of K3.

3. The method of claim 1 , wherein the common interlace and the first interlace are included in a first RB set.

4. The method of claim 3 , wherein the PSFCH resource is included in the first RB set and a second RB set different from the first RB set.

5. The method of claim 4 , wherein the PSFCH resource includes a second common interlace of the same index as the common interlace included in the second RB set.

6. 6. The method of claim 5, wherein a first resource included in the common interlace or the second common interlace is not used for transmitting the at least one PSFCH based on a result of channel sensing for the first RB set being different from a result of channel sensing for the second RB set.

7. The method of claim 1 , wherein the RB set on which the at least one PSSCH is transmitted is the same as the RB set on which the PSFCH resource is included.

8. The method of claim 1 , wherein a PRB to which the at least one PSSCH is not mapped among the at least one dedicated PRB is not used for transmitting the at least one PSFCH.

9. The method of claim 8 , wherein a first sequence mapped to a PRB to which the at least one PSSCH is mapped is different from a second sequence mapped to a PRB to which the at least one PSSCH is not mapped.

10. The method of claim 8, wherein a first cyclic shift applied to a PRB to which the at least one PSSCH is mapped is different from a second cyclic shift applied to a PRB to which the at least one PSSCH is not mapped.

11. The method of claim 1 , wherein K3 is preset.

12. The method of claim 1 , wherein the frequency range of the at least one PRB subset is equal to or greater than 2 MHz.

13. adjusting a transmit power for the transmission of the at least one PSFCH based on a power spectral density (PSD) requirement; The method of claim 1 , wherein a transmit power associated with each of the at least one dedicated PRB is adjusted on an interlace-by-interlace basis.

14. a first device for performing wireless communication, at least one transceiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first device to perform an operation; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subset includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resource.

15. 1. An apparatus configured to control a first terminal, comprising: at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the first terminal to perform an operation; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subset includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resource.

16. A non-transitory computer-readable storage medium having instructions recorded thereon, When executed, the instructions cause a first device to perform an action; The operation is determining PSFCH resources for transmission of at least one physical sidelink feedback channel (PSFCH) associated with at least one physical sidelink shared channel (PSSCH); and The PSFCH resource includes at least one dedicated physical resource block (PRB) included in a first interlace and a common interlace; The at least one PSSCH is mapped to at least one PRB subset; and each of the at least one PRB subset includes K3 PRBs included in the at least one dedicated PRB; performing transmission of the at least one PSFCH based on the PSFCH resources.

17. 1. A method for a second device to perform wireless communication, comprising: Sending sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources; the first PSSCH is mapped to the first PRB subset; The first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB); and The PSFCH resource includes the at least one dedicated PRB included in a first interlace and a common interlace.

18. The method of claim 17, wherein the number of the at least one dedicated PRB is an integer multiple of K3.

19. a second device for performing wireless communication, at least one transceiver; at least one processor; and at least one memory operably coupled to the at least one processor and storing instructions that, when executed by the at least one processor, cause the second device to perform an operation; The operation is Sending sidelink control information (SCI) for scheduling a first physical sidelink shared channel (PSSCH) to a first device via a physical sidelink control channel (PSCCH); transmitting a medium access control (MAC) protocol data unit (PDU) to the first device via the first PSSCH; and receiving hybrid automatic repeat request (HARQ) feedback for the first PSSCH via a first physical resource block (PRB) subset included in physical sidelink feedback channel (PSFCH) resources; the first PSSCH is mapped to the first PRB subset; The first PRB subset includes K3 PRBs included in at least one dedicated physical resource block (PRB); and A second apparatus, wherein the PSFCH resources include the at least one dedicated PRB included in a first interlace and a common interlace.

20. 20. The method of claim 19, wherein the number of the at least one dedicated PRB is an integer multiple of K3.

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